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Crystal structure and Hirshfeld surface analysis of tri­chlorido­(1,10-phenanthroline-κ2N,N')phenyltin(IV)

The title compound, [Sn(C6H5)Cl3(C12H8N2)], which was obtained by the reaction between 1,10-phenanthroline and phenyl­tin trichloride in methanol, exhibits intra­molecular hydrogen-bonding inter­actions involving the chlorine and hydrogen atoms. Crystal cohesion is ensured by inter­molecular C—H⋯Cl hydrogen bonds, as well as Y—X⋯π and π-stacking inter­actions involving three different aromatic rings with centroid–centroid distances of 3.6605 (13), 3.9327 (14) and 3.6938 (12) Å]. Hirshfeld surface analysis and the associated two-dimensional fingerprint plots reveal significant contributions from H⋯H (30.7%), Cl⋯H/H⋯Cl (32.4%), and C⋯H/H⋯C (24.0%) contacts to the crystal packing while the C⋯C (6.2%), C⋯Cl/Cl⋯C (4.1%), and N⋯H/H⋯N (1.7%) inter­actions make smaller contributions.




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8-Hy­droxy­quinolinium tri­chlorido­(pyridine-2,6-di­carb­oxy­lic acid-κ3O,N,O')copper(II) dihydrate

The title compound, (C9H8NO)[CuCl3(C7H5NO4)]·2H2O, was prepared by reacting CuII acetate dihydrate, solid 8-hy­droxy­quinoline (8-HQ), and solid pyridine-2,6-di­carb­oxy­lic acid (H2pydc), in a 1:1:1 molar ratio, in an aqueous solution of dilute hydro­chloric acid. The CuII atom exhibits a distorted CuO2NCl3 octa­hedral geometry, coordinating two oxygen atoms and one nitro­gen atom from the tridentate H2pydc ligand and three chloride atoms; the nitro­gen atom and one chloride atom occupy the axial positions with Cu—N and Cu—Cl bond lengths of 2.011 (2) Å and 2.2067 (9) Å, respectively. In the equatorial plane, the oxygen and chloride atoms are arranged in a cis configuration, with Cu—O bond lengths of 2.366 (2) and 2.424 (2) Å, and Cu—Cl bond lengths of 2.4190 (10) and 2.3688 (11) Å. The asymmetric unit contains 8-HQ+ as a counter-ion and two uncoordinated water mol­ecules. The crystal structure features strong O—H⋯O and O—H⋯Cl hydrogen bonds as well as weak inter­actions including C—H⋯O, C—H⋯Cl, Cu—Cl⋯π, and π–π, which result in a three-dimensional network. A Hirshfeld surface analysis indicates that the most important contributions to the crystal packing involving the main residues are from H⋯Cl/Cl⋯H inter­actions, contributing 40.3% for the anion. Weak H⋯H contacts contribute 13.2% for the cation and 28.6% for the anion.




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Synthesis and crystal structure of 1H-1,2,4-triazole-3,5-di­amine monohydrate

The title compound, a hydrate of 3,5-di­amino-1,2,4-triazole (DATA), C2H5N5·H2O, was synthesized in the presence of sodium perchlorate. The evaporation of H2O from its aqueous solution resulted in anhydrous DATA, suggesting that sodium perchlorate was required to precipitate the DATA hydrate. The DATA hydrate crystallizes in the P21/c space group in the form of needle-shaped crystals with one DATA and one water mol­ecule in the asymmetric unit. The water mol­ecules form a three-dimensional network in the crystal structure. Hirshfeld surface analysis revealed that 8.5% of the inter­molecular inter­actions originate from H⋯O contacts derived from the incorporation of the water mol­ecules.




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Structure of 2,3,5-tri­phenyl­tetra­zol-3-ium chloride hemi­penta­hydrate

The title hydrated mol­ecular salt, C19H15N4+·Cl−·2.5H2O, has two tri­phenyl­tetra­zolium cations, two chloride anions and five water mol­ecules in the asymmetric unit. The cations differ in the conformations of the phenyl rings with respect to the heterocyclic core, most notably for the C-bonded phenyl ring, for which the N—C—C—C torsion angles differ by 36.4 (3)°. This is likely a result of one cation accepting an O—H⋯N hydrogen bond from a water mol­ecule [O⋯N = 3.1605 (15) Å], while the other cation accepts no hydrogen bonds. In the extended structure, the water mol­ecules are involved in centrosymmetric (H2O)2Cl2 rings as well as (H2O)4 chains. An unusual O—H⋯π inter­action and weak C—H⋯O and C—H⋯Cl hydrogen bonds are also observed.




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Triclinic polymorph of bis­[2-methyl-3-(pyridin-2-yl)imidazo[1,5-a]pyridin-2-ium] tetra­chloridocadmium(II)

The crystal structure of the title organic–inorganic hybrid salt, (C13H12N3)2[CdCl4], (I), has been reported with four mol­ecules in the asymmetric unit in a monoclinic cell [Vassilyeva et al. (2021). RSC Advances, 11, 7713–7722]. While using two different aldehydes in the oxidative cyclization–condensation involving CH3NH2·HCl to prepare a new monovalent cation with the imidazo[1,5-a]pyridinium skeleton, a new polymorph was obtained for (I) in space group P1 and a unit cell with approximately half the volume of the monoclinic form. The structural configurations of the two crystallographically non-equivalent organic cations as well as the geometry of the moderately distorted tetra­hedral CdCl42– dianion show minor changes. In the crystal, identically stacked cations and tetra­chloro­cadmate anions form separate columns parallel to the a axis. The loose packing of the anions leads to a minimal separation of approximately 9.53 Å between the metal atoms in the triclinic form versus 7.51 Å in the monoclinic one, indicating that the latter is packed slightly more densely. The two forms also differ by aromatic stacking motifs. Similar to the monoclinic polymorph, the triclinic one excited at 364 nm shows an intense unsymmetrical photoluminescent band with maximum at 403 nm and a full width at half maximum of 51 nm in the solid state.




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Crystal structure of (μ2-7-{[bis­(pyridin-2-ylmeth­yl)amino-1κ3N,N',N'']meth­yl}-5-chloro­quinolin-8-olato-2κN;1:2κ2O)tri­chlorido-1κCl,2κ2Cl-dizinc(II)

The title compound, [Zn2(C22H18ClN4O)Cl3], is a dinuclear zinc(II) complex with three chlorido ligands and one penta­dentate ligand containing quinolin-8-olato and bis­(pyridin-2-ylmeth­yl)amine groups. One of the two ZnII atom adopts a tetra­hedral geometry and coordinates two chlorido ligands with chelate coord­ination of the N and O atoms of the quinolin-8-olato group in the ligand. The other ZnII atom adopts a distorted trigonal–bipyramidal geometry, and coordinates one chlorido-O atom of the quinolin-8-olato group and three N atoms of the bis­(pyridin-2-ylmeth­yl)amine unit. In the crystal, two mol­ecules are associated through a pair of inter­molecular C—H⋯Cl hydrogen bonds, forming a dimer with an R22(12) ring motif. Another inter­molecular C—H⋯Cl hydrogen bond forms a spiral C(8) chain running parallel to the [010] direction. The dimers are linked by these two inter­molecular C—H⋯Cl hydrogen bonds, generating a ribbon sheet structure in ac plane. Two other inter­molecular C—H⋯Cl hydrogen bonds form a C(7) chain along the c-axis direction and another C(7) chain generated by a d-glide plane. The mol­ecules are cross-linked through the four inter­molecular C—H⋯Cl hydrogen bonds to form a three-dimensional network.




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Crystal structure of N,N',N''-tri­cyclo­prop­ylbenzene-1,3,5-tricarboxamide

The title compound, C18H21N3O3, was prepared from 1,3,5-benzene­tricarbonyl trichloride and cyclo­propyl­amine. Its crystal structure was solved in the monoclinic space group P21/c. In the crystal, the three amide groups of the mol­ecule are inclined at angles of 26.5 (1), 36.9 (1) and 37.8 (1)° with respect to the plane of the benzene ring. The mol­ecules are linked by N—H⋯O hydrogen bonds, forming two-dimensional supra­molecular aggregates that extend parallel to the crystallographic ab plane and are further connected by C—H⋯O contacts. As a result of the supra­molecular inter­actions, a propeller-like conformation of the title mol­ecule can be observed.




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Crystal structure of an aceto­nitrile solvate of 2-(3,4,5-triphen­ylphen­yl)acetic acid

Crystal growth of 2-(3,4,5-triphen­ylphen­yl)acetic acid (1) from aceto­nitrile yields a monosolvate, C26H20O2·CH3CN, of the space group P1. In the crystal, the title mol­ecule adopts a conformation in which the three phenyl rings are arranged in a paddlewheel-like fashion around the central arene ring and the carboxyl residue is oriented nearly perpendicular to the plane of this benzene ring. Inversion-symmetric dimers of O—H⋯O-bonded mol­ecules of 1 represent the basic supra­molecular entities of the crystal structure. These dimeric mol­ecular units are further linked by C—H⋯O=C bonds to form one-dimensional supra­molecular aggregates running along the crystallographic [111] direction. Weak Car­yl—H⋯N inter­actions occur between the mol­ecules of 1 and aceto­nitrile.




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Synthesis and crystal structure of 1,3,5-tris­[(1H-benzotriazol-1-yl)meth­yl]-2,4,6-tri­ethyl­benzene

In the crystal structure of the title compound, C33H33N9, the tripodal mol­ecule exists in a conformation in which the substituents attached to the central arene ring are arranged in an alternating order above and below the ring plane. The three benzotriazolyl moieties are inclined at angles of 88.3 (1), 85.7 (1) and 82.1 (1)° with respect to the mean plane of the benzene ring. In the crystal, only weak mol­ecular cross-linking involving C—H⋯N hydrogen bonds is observed.




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Crystal structures and photophysical properties of mono- and dinuclear ZnII complexes flanked by tri­ethyl­ammonium

Two new zinc(II) complexes, tri­ethyl­ammonium di­chlorido­[2-(4-nitro­phen­yl)-4-phenyl­quinolin-8-olato]zinc(II), (C6H16N){Zn(C21H13N2O3)Cl2] (ZnOQ), and bis­(tri­ethyl­ammonium) {2,2'-[1,4-phenyl­enebis(nitrilo­methyl­idyne)]diphenolato}bis­[di­chlorido­zinc(II)], (C6H16N)2[Zn2(C20H14N2O2)Cl4] (ZnBS), were synthesized and their structures were determined using ESI–MS spectrometry, 1H NMR spectroscopy, and single-crystal X-ray diffraction. The results showed that the ligands 2-(4-nitro­phen­yl)-4-phenyl­quinolin-8-ol (HOQ) and N,N'-bis­(2-hy­droxy­benzyl­idene)benzene-1,4-di­amine (H2BS) were deprotonated by tri­ethyl-amine, forming the counter-ion Et3NH+, which inter­acts via an N—H⋯O hydrogen bond with the ligand. The ZnII atoms have a distorted trigonal–pyramidal (ZnOQ) and distorted tetra­hedral (ZnBS) geometries with a coord­ination number of four, coordinating with the ligands via N and O atoms. The N atoms coordinating with ZnII correspond to the heterocyclic nitro­gen for the HOQ ligand, while for the H2BS ligand, it is the nitro­gen of the imine (CH=N). The crystal packing of ZnOQ is characterized by C—H⋯π inter­actions, while that of ZnBS by C—H⋯Cl inter­actions. The emission spectra showed that ZnBS complex exhibits green fluorescence in the solid state with a small band-gap energy, and the ZnOQ complex does exhibit non-fluorescence.




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Crystal structure of bis­{5-(4-chloro­phen­yl)-3-[6-(1H-pyrazol-1-yl)pyridin-2-yl]-1H-1,2,4-triazol-1-ido}nickel(II) methanol disolvate

The unit cell of the title compound, [Ni(C16H10ClN6)2]·2CH3OH, consists of a neutral complex and two methanol mol­ecules. In the complex, the two tridentate 2-(3-(4-chloro­phen­yl)-1H-1,2,4-triazol-5-yl)-6-(1H-pyrazol-1-yl)pyridine ligands coordinate to the central NiII ion through the N atoms of the pyrazole, pyridine and triazole groups, forming a pseudo­octa­hedral coordination sphere. Neighbouring tapered mol­ecules are linked through weak C—H(pz)⋯π(ph) inter­actions into monoperiodic chains, which are further linked through weak C—H⋯N/C inter­actions into diperiodic layers. The inter­molecular contacts were qu­anti­fied using Hirshfeld surface analysis and two-dimensional fingerprint plots, revealing the relative contributions of the contacts to the crystal packing to be H⋯H 32.8%, C⋯H/H⋯C 27.5%, N⋯H/H⋯N 15.1%, and Cl⋯H/H⋯Cl 14.0%. The average Ni—N bond distance is 2.095 Å. Energy framework analysis at the HF/3–21 G theory level was performed to qu­antify the inter­action energies in the crystal structure.




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Reducing heat load density with asymmetric and inclined double-crystal monochromators: principles and requirements revisited

The major principles and requirements of asymmetric and inclined double-crystal monochromators are re-examined and presented to guide their design and development for significantly reducing heat load density and gradient on the monochromators of fourth-generation synchrotron light sources and X-ray free-electron lasers.




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POMFinder: identifying polyoxometallate cluster structures from pair distribution function data using explainable machine learning

Characterization of a material structure with pair distribution function (PDF) analysis typically involves refining a structure model against an experimental data set, but finding or constructing a suitable atomic model for PDF modelling can be an extremely labour-intensive task, requiring carefully browsing through large numbers of possible models. Presented here is POMFinder, a machine learning (ML) classifier that rapidly screens a database of structures, here polyoxometallate (POM) clusters, to identify candidate structures for PDF data modelling. The approach is shown to identify suitable POMs from experimental data, including in situ data collected with fast acquisition times. This automated approach has significant potential for identifying suitable models for structure refinement to extract quantitative structural parameters in materials chemistry research. POMFinder is open source and user friendly, making it accessible to those without prior ML knowledge. It is also demonstrated that POMFinder offers a promising modelling framework for combined modelling of multiple scattering techniques.




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Operation model of a skew-symmetric split-crystal neutron interferometer

The observation of neutron interference using a triple Laue interferometer formed by two separate crystals opens the way to the construction and operation of skew-symmetric interferometers with extended arm separation and length. The specifications necessary for their successful operation are investigated here: most importantly, how the manufacturing tolerance and crystal alignments impact the interference visibility. In contrast with previous studies, both incoherent sources and the three-dimensional operation of the interferometer are considered. It is found that, with a Gaussian Schell model of an incoherent source, the integrated density of the particles leaving the interferometer is the same as that yielded by a coherent Gaussian source having a radius equal to the coherence length.




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A note on the Hendrickson–Lattman phase probability distribution and its equivalence to the generalized von Mises distribution

Hendrickson & Lattman [Acta Cryst. (1970), B26, 136–143] introduced a method for representing crystallographic phase probabilities defined on the unit circle. Their approach could model the bimodal phase probability distributions that can result from experimental phase determination procedures. It also provided simple and highly effective means to combine independent sources of phase information. The present work discusses the equivalence of the Hendrickson–Lattman distribution and the generalized von Mises distribution of order two, which has been studied in the statistical literature. Recognizing this connection allows the Hendrickson–Lattman distribution to be expressed in an alternative form which is easier to interpret, as it involves the location and concentration parameters of the component von Mises distributions. It also allows clarification of the conditions for bimodality and access to a simplified analytical method for evaluating the trigonometric moments of the distribution, the first of which is required for computing the best Fourier synthesis in the presence of phase, but not amplitude, uncertainty.




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Tripling of the scattering vector range of X-ray reflectivity on liquid surfaces using a double-crystal deflector

The maximum range of perpendicular momentum transfer (qz) has been tripled for X-ray scattering from liquid surfaces when using a double-crystal deflector setup to tilt the incident X-ray beam. This is achieved by employing a higher-energy X-ray beam to access Miller indices of reflecting crystal atomic planes that are three times higher than usual. The deviation from the exact Bragg angle condition induced by misalignment between the X-ray beam axis and the main rotation axis of the double-crystal deflector is calculated, and a fast and straightforward procedure to align them is deduced. An experimental method of measuring scattering intensity along the qz direction on liquid surfaces up to qz = 7 Å−1 is presented, with liquid copper serving as a reference system for benchmarking purposes.




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A correction procedure for secondary scattering contributions from windows in small-angle X-ray scattering and ultra-small-angle X-ray scattering

This article describes a correction procedure for the removal of indirect background contributions to measured small-angle X-ray scattering patterns. The high scattering power of a sample in the ultra-small-angle region may serve as a secondary source for a window placed in front of the detector. The resulting secondary scattering appears as a sample-dependent background in the measured pattern that cannot be directly subtracted. This is an intricate problem in measurements at ultra-low angles, which can significantly reduce the useful dynamic range of detection. Two different procedures are presented to retrieve the real scattering profile of the sample.




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Design and fabrication of 3D-printed in situ crystallization plates for probing microcrystals in an external electric field

X-ray crystallography is an established tool to probe the structure of macromolecules with atomic resolution. Compared with alternative techniques such as single-particle cryo-electron microscopy and micro-electron diffraction, X-ray crystallography is uniquely suited to room-temperature studies and for obtaining a detailed picture of macromolecules subjected to an external electric field (EEF). The impact of an EEF on proteins has been extensively explored through single-crystal X-ray crystallography, which works well with larger high-quality protein crystals. This article introduces a novel design for a 3D-printed in situ crystallization plate that serves a dual purpose: fostering crystal growth and allowing the concurrent examination of the effects of an EEF on crystals of varying sizes. The plate's compatibility with established X-ray crystallography techniques is evaluated.




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Program VUE: analysing distributions of cryo-EM projections using uniform spherical grids

Three-dimensional cryo electron microscopy reconstructions are obtained by extracting information from a large number of projections of the object. These projections correspond to different `views' or `orientations', i.e. directions in which these projections show the reconstructed object. Uneven distribution of these views and the presence of dominating preferred orientations may distort the reconstructed spatial images. This work describes the program VUE (views on uniform grids for cryo electron microscopy), designed to study such distributions. Its algorithms, based on uniform virtual grids on a sphere, allow an easy calculation and accurate quantitative analysis of the frequency distribution of the views. The key computational element is the Lambert azimuthal equal-area projection of a spherical uniform grid onto a disc. This projection keeps the surface area constant and represents the frequency distribution with no visual bias. Since it has multiple tunable parameters, the program is easily adaptable to individual needs, and to the features of a particular project or of the figure to be produced. It can help identify problems related to an uneven distribution of views. Optionally, it can modify the list of projections, distributing the views more uniformly. The program can also be used as a teaching tool.




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The pypadf package: computing the pair angle distribution function from fluctuation scattering data

The pair angle distribution function (PADF) is a three- and four-atom correlation function that characterizes the local angular structure of disordered materials, particles or nanocrystalline materials. The PADF can be measured using X-ray or electron fluctuation diffraction data, which can be collected by scanning or flowing a structurally disordered sample through a focused beam. It is a natural generalization of established pair distribution methods, which do not provide angular information. The software package pypadf provides tools to calculate the PADF from fluctuation diffraction data. The package includes tools for calculating the intensity correlation function, which is a necessary step in the PADF calculation and also the basis for other fluctuation scattering analysis techniques.




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Subgradient-projection-based stable phase-retrieval algorithm for X-ray ptychography

X-ray ptychography is a lensless imaging technique that visualizes the nano­structure of a thick specimen which cannot be observed with an electron microscope. It reconstructs a complex-valued refractive index of the specimen from observed diffraction patterns. This reconstruction problem is called phase retrieval (PR). For further improvement in the imaging capability, including expansion of the depth of field, various PR algorithms have been proposed. Since a high-quality PR method is built upon a base PR algorithm such as ePIE, developing a well performing base PR algorithm is important. This paper proposes an improved iterative algorithm named CRISP. It exploits subgradient projection which allows adaptive step size and can be expected to avoid yielding a poor image. The proposed algorithm was compared with ePIE, which is a simple and fast-convergence algorithm, and its modified algorithm, rPIE. The experiments confirmed that the proposed method improved the reconstruction performance for both simulation and real data.




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Operando pair distribution function analysis of nanocrystalline functional materials: the case of TiO2-bronze nanocrystals in Li-ion battery electrodes

Structural modelling of operando pair distribution function (PDF) data of complex functional materials can be highly challenging. To aid the understanding of complex operando PDF data, this article demonstrates a toolbox for PDF analysis. The tools include denoising using principal component analysis together with the structureMining, similarityMapping and nmfMapping apps available through the online service `PDF in the cloud' (PDFitc, https://pdfitc.org/). The toolbox is used for both ex situ and operando PDF data for 3 nm TiO2-bronze nanocrystals, which function as the active electrode material in a Li-ion battery. The tools enable structural modelling of the ex situ and operando PDF data, revealing two pristine TiO2 phases (bronze and anatase) and two lithiated LixTiO2 phases (lithiated versions of bronze and anatase), and the phase evolution during galvanostatic cycling is characterized.




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Determining pair distribution functions of thin films using laboratory-based X-ray sources

This article demonstrates the feasibility of obtaining accurate pair distribution functions of thin amorphous films down to 80 nm, using modern laboratory-based X-ray sources. The pair distribution functions are obtained using a single diffraction scan without the requirement of additional scans of the substrate or of the air. By using a crystalline substrate combined with an oblique scattering geometry, most of the Bragg scattering of the substrate is avoided, rendering the substrate Compton scattering the primary contribution. By utilizing a discriminating energy filter, available in the latest generation of modern detectors, it is demonstrated that the Compton intensity can further be reduced to negligible levels at higher wavevector values. Scattering from the sample holder and the air is minimized by the systematic selection of pixels in the detector image based on the projected detection footprint of the sample and the use of a 3D-printed sample holder. Finally, X-ray optical effects in the absorption factors and the ratios between the Compton intensity of the substrate and film are taken into account by using a theoretical tool that simulates the electric field inside the film and the substrate, which aids in planning both the sample design and the measurement protocol.




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Ptychographic phase retrieval via a deep-learning-assisted iterative algorithm

Ptychography is a powerful computational imaging technique with microscopic imaging capability and adaptability to various specimens. To obtain an imaging result, it requires a phase-retrieval algorithm whose performance directly determines the imaging quality. Recently, deep neural network (DNN)-based phase retrieval has been proposed to improve the imaging quality from the ordinary model-based iterative algorithms. However, the DNN-based methods have some limitations because of the sensitivity to changes in experimental conditions and the difficulty of collecting enough measured specimen images for training the DNN. To overcome these limitations, a ptychographic phase-retrieval algorithm that combines model-based and DNN-based approaches is proposed. This method exploits a DNN-based denoiser to assist an iterative algorithm like ePIE in finding better reconstruction images. This combination of DNN and iterative algorithms allows the measurement model to be explicitly incorporated into the DNN-based approach, improving its robustness to changes in experimental conditions. Furthermore, to circumvent the difficulty of collecting the training data, it is proposed that the DNN-based denoiser be trained without using actual measured specimen images but using a formula-driven supervised approach that systemically generates synthetic images. In experiments using simulation based on a hard X-ray ptychographic measurement system, the imaging capability of the proposed method was evaluated by comparing it with ePIE and rPIE. These results demonstrated that the proposed method was able to reconstruct higher-spatial-resolution images with half the number of iterations required by ePIE and rPIE, even for data with low illumination intensity. Also, the proposed method was shown to be robust to its hyperparameters. In addition, the proposed method was applied to ptychographic datasets of a Simens star chart and ink toner particles measured at SPring-8 BL24XU, which confirmed that it can successfully reconstruct images from measurement scans with a lower overlap ratio of the illumination regions than is required by ePIE and rPIE.




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Coordinate-based simulation of pair distance distribution functions for small and large molecular assemblies: implementation and applications

X-ray scattering has become a major tool in the structural characterization of nanoscale materials. Thanks to the widely available experimental and computational atomic models, coordinate-based X-ray scattering simulation has played a crucial role in data interpretation in the past two decades. However, simulation of real-space pair distance distribution functions (PDDFs) from small- and wide-angle X-ray scattering, SAXS/WAXS, has been relatively less exploited. This study presents a comparison of PDDF simulation methods, which are applied to molecular structures that range in size from β-cyclo­dextrin [1 kDa molecular weight (MW), 66 non-hydrogen atoms] to the satellite tobacco mosaic virus capsid (1.1 MDa MW, 81 960 non-hydrogen atoms). The results demonstrate the power of interpretation of experimental SAXS/WAXS from the real-space view, particularly by providing a more intuitive method for understanding of partial structure contributions. Furthermore, the computational efficiency of PDDF simulation algorithms makes them attractive as approaches for the analysis of large nanoscale materials and biological assemblies. The simulation methods demonstrated in this article have been implemented in stand-alone software, SolX 3.0, which is available to download from https://12idb.xray.aps.anl.gov/solx.html.




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Determination of the average crystallite size and the crystallite size distribution: the envelope function approach EnvACS

A procedure is presented to exactly obtain the apparent average crystallite size (ACS) of powder samples using standard in-house powder diffraction experiments without any restriction originating from the Scherrer equation. Additionally, the crystallite size distribution within the sample can be evaluated. To achieve this, powder diffractograms are background corrected and long-range radial distribution functions G(r) up to 300 nm are calculated from the diffraction data. The envelope function fenv of G(r) is approximated by a procedure determining the absolute maxima of G(r) in a certain interval (r range). Fitting of an ACS distribution envelope function to this approximation gives the ACS and its distribution. The method is tested on diffractograms of LaB6 standard reference materials measured with different wavelengths to demonstrate the validity of the approach and to clarify the influence of the wavelength used. The latter results in a general description of the maximum observable average crystallite size, which depends on the instrument and wavelength used. The crystallite site distribution is compared with particle size distributions based on transmission electron microscopy investigations, providing an approximation of the average number of crystallites per particle.




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Use of a confocal optical device for centring a diamond anvil cell in single-crystal X-ray diffraction experiments

High-pressure crystallographic data can be measured using a diamond anvil cell (DAC), which allows the sample to be viewed only along a cell vector which runs perpendicular to the diamond anvils. Although centring a sample perpendicular to this direction is straightforward, methods for centring along this direction often rely on sample focusing, measurements of the direct beam or short data collections followed by refinement of the crystal offsets. These methods may be inaccurate, difficult to apply or slow. Described here is a method based on precise measurement of the offset in this direction using a confocal optical device, whereby the cell centre is located at the mid-point of two measurements of the distance between a light source and the external faces of the diamond anvils viewed along the forward and reverse directions of the cell vector. It is shown that the method enables a DAC to be centred to within a few micrometres reproducibly and quickly.




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SUBGROUPS: a computer tool at the Bilbao Crystallographic Server for the study of pseudo-symmetric or distorted structures

SUBGROUPS is a free online program at the Bilbao Crystallographic Server (https://www.cryst.ehu.es/). It permits the exploration of all possible symmetries resulting from the distortion of a higher-symmetry parent structure, provided that the relation between the lattices of the distorted and parent structures is known. The program calculates all the subgroups of the parent space group which comply with this relation. The required minimal input is the space-group information of the parent structure and the relation of the unit cell of the distorted or pseudo-symmetric structure with that of the parent structure. Alternatively, the wavevector(s) observed in the diffraction data characterizing the distortion can be introduced. Additional conditions can be added, including filters related to space-group representations. The program provides very detailed information on all the subgroups, including group–subgroup hierarchy graphs. If a Crystallographic Information Framework (CIF) file of the parent high-symmetry structure is uploaded, the program generates CIF files of the parent structure described under each of the chosen lower symmetries. These CIF files may then be used as starting points for the refinement of the distorted structure under these possible symmetries. They can also be used for density functional theory calculations or for any other type of analysis. The power and efficiency of the program are illustrated with a few examples.




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Mitigation of DMM-induced stripe patterns in synchrotron X-ray radiography through dynamic tilting

In synchrotron X-ray radiography, achieving high image resolution and an optimal signal-to-noise ratio (SNR) is crucial for the subsequent accurate image analysis. Traditional methods often struggle to balance these two parameters, especially in situ applications where rapid data acquisition is essential to capture specific dynamic processes. For quantitative image data analysis, using monochromatic X-rays is essential. A double multilayer monochromator (DMM) is successfully used for this aim at the BAMline, BESSY II (Helmholtz Zentrum Berlin, Germany). However, such DMMs are prone to producing an unstable horizontal stripe pattern. Such an unstable pattern renders proper signal normalization difficult and thereby causes a reduction of the SNR. We introduce a novel approach to enhance SNR while preserving resolution: dynamic tilting of the DMM. By adjusting the orientation of the DMM during the acquisition of radiographic projections, we optimize the X-ray imaging quality, thereby enhancing the SNR. The corresponding shift of the projection during this movement is corrected in post-processing. The latter correction allows a good resolution to be preserved. This dynamic tilting technique enables the homogenization of the beam profile and thereby effectively reduces noise while maintaining high resolution. We demonstrate that data captured using this proposed technique can be seamlessly integrated into the existing radiographic data workflow, as it does not need hardware modifications to classical X-ray imaging beamline setups. This facilitates further image analysis and processing using established methods.




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Development of hard X-ray photoelectron spectroscopy in liquid cells using optimized microfabricated silicon nitride membranes

We present first hard X-ray photoelectron spectroscopy (HAXPES) results of aqueous salt solutions and dispersions of gold nanoparticles in liquid cells equipped with specially designed microfabricated thin silicon nitride membranes, with thickness in the 15–25 nm range, mounted in a high-vacuum-compatible environment. The experiments have been performed at the HAXPES endstation of the GALAXIES beamline at the SOLEIL synchrotron radiation facility. The low-stress membranes are fabricated from 100 mm silicon wafers using standard lithography techniques. Platinum alignment marks are added to the chips hosting the membranes to facilitate the positioning of the X-ray beam on the membrane by detecting the corresponding photoemission lines. Two types of liquid cells have been used, a static one built on an Omicron-type sample holder with the liquid confined in the cell container, and a circulating liquid cell, in which the liquid can flow in order to mitigate the effects due to beam damage. We demonstrate that the membranes are mechanically robust and able to withstand 1 bar pressure difference between the liquid inside the cell and vacuum, and the intense synchrotron radiation beam during data acquisition. This opens up new opportunities for spectroscopic studies of liquids.




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Tintin on acid: Charles Burns ends his dark trilogy with 'Sugar Skull'

Graphic novelist and artist Charles Burns, at the Mohn Broadcast Center, 9/18/2014. He's just completed his trilogy with the new book Sugar Skull.; Credit: John Rabe

Graphic novelist Charles Burns stopped by the Mohn Broadcast Center to talk with Off-Ramp host John Rabe about "Sugar Skull," which completes the trilogy that includes "X'ed Out" and "The Hive."  He's doing a signing tonight (Thurday, Sept. 18) at Skylight Books, 1818 N. Vermont Avenue in Los Feliz.

Why the trilogy? Burns says, "I had finished another book, "Black Hole," which was this very long graphic novel, all in black and white, and I wanted to do something in color, so I conceived a series of books, based on a series of my life, late '70s, the Punk Era. It started that way, and then it turned into something else."

RELATED: Miniaturist Alan Wolfson, or "Honey! I shrunk the strip club!"

The look of Burns' books:

... is drawn from one of his childhood favorites, the Belgian Tintin, who had all sorts of politically incorrect adventures:

"It's called the clear-line school of comics. And it's exactly what it sounds like: very clear lines, but perfectly rendered in color."

If there's more shadow in Burns' books than in Herge's, that's because the lines between good and bad, dark and light, reality and unreality are blurrier in Burns. The trilogy moves back and forth in time and place, including between the normal world and a bizarre world in which a character named Johnny 23 struggles with many of the same issues the protagonist in the real world, Doug, faces... including a pregnant girlfriend.

(From Sugar Skull, by Charles Burns. )

Are they two separate stories or Doug's subconscious world? Burns won't say. "That's for the reader to figure out. I don't really ever clearly explain those things at all, and I like to leave those things open. Interpretation is great, as far as I'm concerned."

Burns turns 59 on Sept. 27. How does he like approaching 60? "As far as the day-to-day landscape, things are more settled in. But as far as my sweltering, swelling, itching brain, that hasn't changed at all unfortunately."




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Silver Co. Releases High-Grade Results From Golden Triangle Drilling

Source: Streetwise Reports 11/05/2024

Dolly Varden Silver Corp. (DV:TSX.V; DOLLF:OTCQX) releases new results from its 2024 drilling program at its Kitsault Valley project in British Columbia's Golden Triangle. One analyst says the company is an "attractive target" for large precious metal producers.

Dolly Varden Silver Corp. (DV:TSX.V; DOLLF:OTCQX) released results from five drill holes from its completed 2024 drilling program at its Kitsault Valley project in British Columbia's Golden Triangle.

In total, the program drilled 69 holes for 31,726 meters — 41 holes totaling more than 15,000 meters at the Dolly Varden area and 28 holes totaling more than 16,000 meters at Homestake Ridge.

Highlights of Monday's release include one hole from the Homestake Silver Deposit that found 12.23 grams per tonne gold (g/t Au) and 84 g/t silver (Ag) over 34.93 meters with high-grade breccia veins that included 166 g/t Au and 675 g/t Ag over 0.97 meters.

"The identification of a gold-rich, wide and high-grade area within the Homestake Silver Deposit is highly encouraging," said Chief Executive Officer Shawn Khunkhun. "Our geological team is encouraged by overlapping mineralizing phases of silver and gold-rich veins and breccias; the deposit remains open for expansion."

Technical Analyst Clive Maund, writing on Sunday, called Dolly Varden "one of the best pure silver companies around."

The stock's "breakout at end of last month/early this month was on big volume means it was genuine," Maund wrote.

The stock is at a "classic buy spot, although we should remain aware that it could zigzag a little lower over the short-term, but that said it looks like a strong buy here."

Highlights From Results

Highlights from the Homestake Silver Deposit include:

  • Hole HR24-432: Mineralized envelope including veins: 8.85 g/t Au and 5 g/t Ag over 48.23 meters, including an internal zone of stronger breccia vein intervals grading 29.24 g/t Au and 16 g/t Ag over 13.94 meters, including one breccia vein grading 701 g/t Au and 184 g/t Ag over 0.54 meters.
  • Hole HR24-435: Mineralized envelope including veins: 4.64 g/t Au and 38 g/t Ag over 100.80 meters, including an internal interval of stronger breccia vein mineralization grading 12.23 g/t Au and 84 g/t Ag over 34.93 meters. High-grade breccia veins include 166 g/t Au and 675 g/t Ag over 0.97 meters.
  • Hole HR24-442: Vein breccia zone: 4.58 g/t Au over 9.95 meters, including 14.96 g/t Au over 1.69 meters.

"Results from the five holes in this release suggest that the plunge of mineralization at Homestake Silver has a similar orientation as the Homestake Main Deposit, located 300 meters to the northwest," the company said in a release. "The average grades within these core areas are higher, on a precious metal silver equivalent basis, than the average grade of the silver deposits at the Dolly Varden property further south, due to the increased gold content at the Homestake Ridge Deposits."

Technical Analyst Clive Maund, writing on Sunday, called Dolly Varden "one of the best pure silver companies around."

Drill holes HR24-442 and HR24-445 are step-outs and encountered the mineralized and altered structural corridor of Homestake Silver, the company said. Drill hole HR24-442 intersected a mineralized vein breccia stockwork zone grading 4.58 g/t Au over 9.95 meters, including individual breccias with stronger pyrite mineralization grading 14.96 g/t Au over 1.69 meters.

The Homestake Ridge deposits are interpreted as structurally controlled, multi-phase epithermal vein stockwork and vein breccia system hosted in Jurassic Hazelton volcanic rocks, Dolly Varden noted. Mineralization consists of pyrite plus galena and sphalerite with visible gold in a breccia matrix within a silica breccia vein system.

"The northwest orientation of the main Homestake structural trend appears to have numerous subparallel internal structures that are interpreted to form the controls for higher grade gold and silver shoots within a broader mineralized envelope at the Homestake Silver deposit," the company said. "The main structural corridor dips steeply to the northeast at Homestake Main and rolls to vertical or steeply southwest at Homestake Silver."

Analyst's Response: 'Boom'

Jeff Valks, Senior Analyst for The Gold Advisor newsletter, reacted to the results with the word "BOOM."

"Dolly Varden Silver reports more high-grade drill results from its 2024 exploration program at the Homestake Silver Deposit in British Columbia's Golden Triangle," he wrote on Monday. "Results from five drill holes have confirmed significant gold and silver mineralization in an area targeted within the plunge of a previously undrilled high-grade zone, signaling potential expansion opportunities."

Jeff Valks, Senior Analyst for The Gold Advisor newsletter, reacted to the results with the word "BOOM."

We look forward to the remaining results." Vaks wrote. "In the meantime, the stock is flat as I write but is up over 35% year-to-date. It's not too late to buy, it's down from its recent spike, and as (editor) Jeff (Clark) has said, this is a core holding for the silver bull market. Use a stink bid if you're looking for shares. Both Jeff and I hold long positions."

Analyst Marcus Giannini of Haywood Capital Markets noted in a recent research note that Dolly Varden continues to "push the margins of known high-grade mineralization" at the project.

Gianini gave the stock a Buy rating with a CA$2.40 per share target price. "We continue to view Dolly's high-grade endowment as an increasingly attractive target for larger North American-focused precious metal producers," he noted.

The Catalyst: Analysts Point to Patience

While it has chased the record highs gold has been setting this year, silver recently broke through US$35 per ounce, reflecting a year-to-date gain of about 47%. It has since settled but held to the "crucial US$32.50 level," according to Christopher Lewis of FX Empire on Monday.

"Keep in mind that this is a market that is extraordinarily volatile and, of course, will continue to be noisy over the next couple of days as we get election results in the United States," Lewis wrote. "And of course, we also get the Federal Reserve interest rate decision on Thursday, both of which could cause chaos."

Lewis said he thinks the "least likely path is lower."

"I still favor an upside move, but I recognize that we are definitely in a little bit of a holding pattern," he wrote. "Having said that, if we do see momentum to the upside, then there's really not a whole lot here that could keep this market from trying to challenge the (US$)35 level again, obviously, a large round psychologically significant figure, but we'll just have to wait and see how that plays out."

The most conductive element in nature, silver is used to coat electrical contacts in computers, phones, cars, and appliances. It's also an important element in solar technology.

Mordor Intelligence noted that the white metal is expected to register a compound annual growth rate (CAGR) of more than 5% between 2024 and 2029.

Newsletter editor Brien Lundin encouraged investors not to get discouraged, as any price drop-off is temporary, he said. He expects the silver price to soar when the U.S. Federal Reserve doubles down on its efforts to get interest rates much lower, he wrote on Oct. 23. [OWNERSHIP_CHART-5439]

Based on silver's charts, Ron Struthers of Struthers Resource Stock Report also predicted a major run-up in the silver price.

"Back in April or early May, I highlighted the breakout from a cup and handle formation and [that] that would lead to a major upside move. This is now confirmed," he wrote on Oct. 23.

Ownership and Share Structure

According to the company's latest corporate presentation, 50% of its stock is held by institutional investors, including Fidelity Management & Research Company LLC, Sprott Asset Management LP, U.S. Global Investors Inc., and Delbrook.

About 41% is with strategic investors, including 17% with Fury Gold Mines, 14% with Hecla, and Eric Sprott owns 10% himself.

The rest, 9%, is with retail and high-net-worth investors.

The company has 301.16 million outstanding shares. Its market cap is CA$380.72 million, and its 52-week trading range is CA$0.62–1.46 per share.

Sign up for our FREE newsletter at: www.streetwisereports.com/get-news

Important Disclosures:

  1. Dolly Varden Silver Corp. is a billboard sponsor of Streetwise Reports and pays SWR a monthly sponsorship fee between US$4,000 and US$5,000.
  2. As of the date of this article, officers and/or employees of Streetwise Reports LLC (including members of their household) own securities of Dolly Varden Silver Corp.
  3. Steve Sobek wrote this article for Streetwise Reports LLC and provides services to Streetwise Reports as an employee.
  4. This article does not constitute investment advice and is not a solicitation for any investment. Streetwise Reports does not render general or specific investment advice and the information on Streetwise Reports should not be considered a recommendation to buy or sell any security. Each reader is encouraged to consult with his or her personal financial adviser and perform their own comprehensive investment research. By opening this page, each reader accepts and agrees to Streetwise Reports' terms of use and full legal disclaimer. Streetwise Reports does not endorse or recommend the business, products, services or securities of any company.

For additional disclosures, please click here.

( Companies Mentioned: DV:TSX.V; DOLLF:OTCQX, )




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Gold Co. Announces Resource Expansion Results in Historic Mining District

Source: Streetwise Reports 11/07/2024

Dakota Gold Corp. (DC:NYSE American) announces results from 17 holes in its bid to expand the maiden resource at its Richmond Hill Gold Project in the historic Homestake District of South Dakota. One analyst believes the results support expansion for future resource estimates.

Dakota Gold Corp. (DC:NYSE American) announced drill results from the first 17 holes of its ongoing infill drilling program to expand the maiden resource at its Richmond Hill Gold Project in the historic Homestake District of South Dakota.

An updated S-K 1300 resource estimate is planned for Q1 2025 and a S-K 1300 Initial Assessment with cashflow analysis is planned for Q2 2025, the company said in a release. The expanded resource is expected to include an additional 88 new drill holes totaling 17,000 meters.

"The highlight of this morning's release was (hole) RH24C-099, which was drilled in the Twin Tunnels Zone and returned 1.15 g/t Au (grams per tonne gold) over 51.7 meters from 132.9 meters," wrote Canaccord Genuity Capital Markets Analyst Peter Bell in an updated research note on Monday. "The results this morning were consistent with the current resource at Richmond Hill, with many cases reporting higher-than-average grades."

Bell said the firm was encouraged by the results, "which we believe provide support for expansion in future resource estimates. With infill and step out drilling at Richmond Hill being just one of three ongoing drill programs currently underway at Dakota, underscoring the company's emphasis on exploration and expansion."

Drilling Is 'Adding Ounces'

The maiden S-K 1300 resource, announced in April, outlined an Indicated Resource of 51.83 million tonnes (Mt) at 0.80 g/t Au for 1.33 million ounces (Moz) and Inferred Resource of 58.06 Mt at 0.61 g/t Au for 1.13 Moz., the company said.

The initial infill drill results release released Monday encountered further gold mineralization from the central portion of the Richmond Hill resource area consistent with results reported in the maiden resource, Dakota said. The drilling was conducted in areas where the original resource block model contained gaps to support the company's belief that the initial resource could be significantly expanded with additional infill drilling.

Highlights of the results include:

  • Hole RH24C-077: 0.76 g/t Au over 24.4 meters
  • Hole RH24C-083: 0.70 g/t Au over 13.8 meters
  • Hole RH24C-085: 1.10 g/t Au over 17.9 meters
  • Hole RH24C-088A: 0.96 g/t Au over 41.5 meters
  • Hole RH24C-099: 1.15 g/t Au over 51.7 meters

Dakota said the resource remained open in all directions and could be improved with more drilling, metallurgical work, and incorporation of silver into the resource.

"We are very pleased to see that initial results from our infill drill program are adding ounces to our current S-K 1300 resource," said Dakota Vice President of Exploration James Berry. "The results to date show grades and widths consistent with drill holes in the original block model and support an expansion of gold mineralization, including shallow oxide mineralization. We look forward to continuing our infill program on the other zones identified in our Initial assessment for follow-up drilling."

'Vastly Unexplored' District

The historic Homestake Mine produced 41 Moz Au and 9 Moz silver (Ag) over 126 years. The company has 48,000 acres of holdings surrounding the original mine, which was first discovered in 1876 and consolidated by George Hearst.

Areas surrounding "super-giant deposits" like Homestake are believed to contain significant additional gold resources, wrote John Newell wrote.

Areas surrounding "super-giant deposits" like Homestake are believed to contain significant additional gold resources, wrote John Newell of John Newell & Associates this week for a Streetwise Reports piece on the legacy of the famous mine.

"Super-giant deposits are characterized by clusters of geologically similar deposits within several hundred square kilometers, defining profoundly mineralized regions," Newell wrote. "It is believed that at least twice that amount of gold exists in the neighborhood of these super giants. If that is true, then there are at least 100 Moz of gold left to be found in this vastly underexplored precious metal district of South Dakota."

This proximity to a super-giant "suggests a high potential for similar deposits," Newell wrote. "Being in the shadow of many old mines increases the probability of finding significant mineral resources."

The Catalyst: Gold Continues Bull Market

After hitting a record high of US$2,790.15 per ounce on Thursday, spot gold was up 0.1% to US$2,737.35 on Monday afternoon, according to Reuters.

Investors were keeping a close on Tuesday's presidential election in the U.S. and the Federal Reserve's meeting later this week, Anjana Anil reported.

"A Reuters/Ipsos poll conducted last month found worries that the U.S. could see a repeat of the unrest that followed Trump's 2020 election defeat, when his false claim that his loss was the result of fraud prompted hundreds to storm the U.S. Capitol," Anil wrote.

Gold's rise has "resulted in big returns for the investors who bought in earlier this year," Angelica Leicht reported for CBS News last month. "For example, the investors who purchased gold in March when it hit US$2,160 per ounce have seen their gold values increase by nearly 27% in the time since. That's a huge uptick in value in a matter of months, especially on an asset that's known more for long-term growth."

Recently polled London Bullion Market Association members indicated they believe the gold price could reach US$2,940/oz during 2025, reported Stockhead on Oct. 28.

"Combined with expectations of lower global interest rates, this further enhances gold's attractiveness as an investment," the article noted.[OWNERSHIP_CHART-7442]

As for gold equities, the S&P/TSX Venture Composite Index (SPCDNX) confirmed a multidecade bull run for junior, intermediate, and senior mining stocks when it closed above 1,000 recently, Stewart Thomson with 321Gold wrote. The index is a key indicator of the health of the general gold, silver, and mining stocks market.

Ownership and Share Structure

According to the company, approximately 25% of its shares are with management and insiders.

Out of management, Co-chairman, Director, President and Chief Executive Officer Robert Quartermain holds the most shares at 8.4%, while COO Jerry Aberle holds 4.8%, the company said.

About 26% of the shares are with institutional investors, according to Yahoo Finance and Edgar filings. Top institutional holders include Fourth Sail Capital with 5.3%, Van Eck Associates with 4.1%, Blackrock Institutional Trust Co. with 3.7%, The Vanguard Group Inc. with about 3.2%, Fidelity Management and Research Co. LLC with 2.7%, and CI Global Asset Management with 2.6%.

About 16.5% is with strategic investors, including Orion Mine Finance, which owns about 9.9%, and Barrick Gold Corp., which owns about 2.5%. The rest is retail.

Dakota Gold has a market cap of US$212.61 million, with 93.66 million shares outstanding. It trades in a 52-week range of US$3.25 and US$1.84.

Sign up for our FREE newsletter at: www.streetwisereports.com/get-news

Important Disclosures:

  1. Dakota Gold Corp. is a billboard sponsor of Streetwise Reports and pays SWR a monthly sponsorship fee between US$4,000 and US$5,000.
  2. As of the date of this article, officers and/or employees of Streetwise Reports LLC (including members of their household) own securities of Dakota Gold Corp.
  3. Steve Sobek wrote this article for Streetwise Reports LLC and provides services to Streetwise Reports as an employee.
  4. This article does not constitute investment advice and is not a solicitation for any investment. Streetwise Reports does not render general or specific investment advice and the information on Streetwise Reports should not be considered a recommendation to buy or sell any security. Each reader is encouraged to consult with his or her personal financial adviser and perform their own comprehensive investment research. By opening this page, each reader accepts and agrees to Streetwise Reports' terms of use and full legal disclaimer. Streetwise Reports does not endorse or recommend the business, products, services or securities of any company.

For additional disclosures, please click here.

( Companies Mentioned: DC:NYSE American, )




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LA City Council to Vote on New Measure to Restrict Homeless Encampments

Tents housing the homeless at an encampment in Echo Lake Park in Los Angeles, California on March 24, 2021.; Credit: FREDERIC J. BROWN/AFP via Getty Images

AirTalk

The Los Angeles City Council votes Thursday on a proposal to ban sleeping or camping in certain parts of the city, including near schools, parks, libraries, and other “sensitive” facilities like daycares. It would also ban tents and encampments from blocking sidewalks if wheelchair users cannot access them. The motion is a departure from the city’s previous approach to the homelessness crisis.

Council members voted 12 to 3 on Tuesday to pull the draft ordinance out of Homelessness and Poverty Committee, where it had been stuck since November, and directed City Attorney Mike Feuer’s office to draft the new rules. Today on AirTalk, we’re speaking with Los Angeles Times reporter Ben Oreskes about the proposed rules, what Thursday’s vote means, and what we know about possible legal ramifications of the proposed changes. 

Guest: 

Ben Oreskes, staff writer at the Los Angeles Times; he tweets @boreskes

This content is from Southern California Public Radio. View the original story at SCPR.org.




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Marathons, Triathlons And More: What Motivates Us To Undertake Physical Feats?

Athletes compete during the cycling portion of the IRONMAN 70.3 Steelhead on June 27, 2021 in Benton Harbor, Michigan. ; Credit: Patrick McDermott/Getty Images for IRONMAN

AirTalk

Whether you’re new to running or you’ve finished your tenth triathlon, we want to hear from you about what motivates you and how that translates into pushing yourself physically. 

Guests: 

Mark Remy, longtime runner and writer in Portland, Oregon; creator of humor website dumbrunner.com; he is the author of many books, including The Runner's Rule Book: Everything a Runner Needs to Know--And Then Some (Runner's World) (Rodale Books, 2009)

Sharon McNary, infrastructure correspondent at KPCC; she finished her 11th Ironman Race last week at Coeur d’Alene; she tweets @KPCCsharon

This content is from Southern California Public Radio. View the original story at SCPR.org.




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Trick or Treat? Astrogeology explores the Solar System’s Halloween spirit.

The Solar System is full of its own tricks and treats, so discover some of our favorites below.




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NASA Partners with the Alaska CASC and Others to Make NASA Climate Data Tools More Accessible to Tribal and Indigenous Communities

NASA released a workshop report on the UNBOUND-FEW workshop series, which was facilitated in part by Tribal Resilience Learning Network staff from the Alaska CASC. The workshop report reveals key recommendations for making data tools more useful for climate adaptation planning.




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Arizona Republicans Strip Some Election Power From Democratic Secretary Of State

"This is a petty, partisan power grab that is absolutely retaliation towards my office," Arizona Democratic Secretary of State Katie Hobbs says of the new law.; Credit: Ross D. Franklin/AP

Ben Giles | NPR

Arizona Republicans have stripped the secretary of state's office — currently held by a Democrat — of the right to defend the state's election laws in court, or choose not to, a change enacted as part of Arizona's newly signed budget.

The spending blueprint that Gov. Doug Ducey signed into law Wednesday declares that the attorney general — currently a position occupied by Republican Mark Brnovich — has sole authority over election-related litigation.

If the secretary of state and attorney general were to disagree over a legal strategy when Arizona election laws are challenged, the new law states that "the authority of the attorney general to defend the law is paramount."

Republicans also adopted language stating it's their intent for the law to apply through Jan. 2, 2023, coinciding with the end of Democrat Katie Hobbs' term as secretary of state.

Hobbs, the top election official in Arizona who's now running for governor, says her lawyers are looking at whether this change violates the Arizona Constitution.

"This is a petty, partisan power grab that is absolutely retaliation towards my office," Hobbs said. "It's clear by the fact that it ends when my term ends. ... It is at best legally questionable, but at worst, likely unconstitutional."

Republicans have generally cast the law as a cost-saving measure, citing Hobbs and Brnovich's frequent disagreements over how to defend state election laws that have been challenged in court. In 2020, Hobbs filed complaints with the state bar against Brnovich and other lawyers in his office.

Other election provisions in the budget

The budget includes a number of other election provisions, and it comes weeks after Republicans enacted new restrictions on early voting in the state, and as a controversial review of 2020 election results in Maricopa County continues.

Here are some of the other election-related measures in the budget:

  • New laws could soon require watermarks, QR codes and other security measures to be printed on ballots.
  • There's a new mandate to inspect state and county voter registration databases and create a report on voters who cast federal-only ballots — an option available to Arizonans who don't show proof of citizenship to register to vote in the state, but are still allowed to register under federal law.
  • And a new task force would investigate alleged social media bias as an unreported in-kind political contribution.

The ballot security measures, though not mandated by law in the budget, have the potential to be the most cumbersome and costly requirement for county election officials to implement.

The budget amendment provides a list of 10 "ballot fraud countermeasures" for counties to choose from — features like holographic foil, background designs similar to those found on banknotes and ultraviolet or infrared ink. If mandated, counties would have to implement any combination of at least three features from the list on their ballots. The budget provides $12 million to pay for those features, to be split among Arizona's 15 counties.

"By everyone's admission, there is only one company that can do any of this," said Jennifer Marson, executive director of the Arizona Association of Counties. "And so now, we can't have a competitive bid process or a traditional procurement process at the county or state level to use these countermeasures because we're locked into one company."

That company is Authentix, a Texas-based firm that provided Republican Rep. Mark Finchem with a sample ballot that included watermarks, QR codes and other security measures. Finchem had the sample ballot on display at the Capitol in March. According to the Yellow Sheet Report, it could be five times more expensive to print ballots with those security measures as it is to print paper ballots currently in use.

Marson said Finchem has acknowledged the security levels required of companies in the budget amendment could only be met by Authentix, and has vowed to mandate the ballot security measures in the "very near future."

Finchem defended the company in a brief email. He wrote that Authentix "offers these countermeasures to governments around the world for document and tax stamp security."

As the budget was being considered, Democrats like Sen. Tony Navarrete said the amendment is part of a broad effort to solidify conspiracy theories of election fraud.

"It's important for us to make sure we vote down conspiracy-laced amendments that are going to hurt the integrity of our election system in the state of Arizona and encourage other states to have these bad copycat laws spread like wildfire," he said.

Copyright 2021 KJZZ. To see more, visit KJZZ.

This content is from Southern California Public Radio. View the original story at SCPR.org.




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Tribute To Animator Marcell Jankovics, Plus Critics Share Their Streaming Recs

Photo of Marcell Jankovics; Credit: courtesy of cartoonbrew.com

FilmWeek

FilmWeek’s animation authority, Charles Solomon, remembers the great Hungarian animator Marcell Jankovics, who died on May 29. He died at the age of 79. Our critics also share some of the things they’ve been busy watching on various streaming platforms and why they recommend listeners check them out.  

Guests:

Amy Nicholson, film critic for KPCC, film writer for The New York Times and host of the podcast ‘Unspooled’ and the podcast miniseries “Zoom”; she tweets @TheAmyNicholson

Wade Major, film critic for KPCC and CineGods.com

Charles Solomon, film critic for KPCC, Animation Scoop and Animation Magazine

This content is from Southern California Public Radio. View the original story at SCPR.org.




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High-Grade Gold Strikes in Brazil as New Drilling Results Reveal Untapped Potential

GoldMining Inc. (GOLD:TSX; GLDG:NYSE.American) released results from its ongoing 2024 auger drilling program at the Sao Jorge Project in the Tapajos gold district, Para State, Brazil. Read more about high-grade gold intercepts and new exploration targets at So Jorge as GoldMining extends its search in Tapajs.




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Biden Administration Strikes Deal To Bring Offshore Wind To California

The Biden administration is opening the West Coast to offshore wind. Companies have largely focused on the East Coast, like this wind farm off Block Island, Rhode Island.; Credit: Don Emmert/AFP via Getty Images

Lauren Sommer | NPR

Updated May 25, 2021 at 2:56 PM ET

The Biden administration plans to open the California coast to offshore wind development, ending a long-running stalemate with the Department of Defense that has been the biggest barrier to building wind power along the Pacific Coast.

The move adds momentum to the administration's goal of reaching 100% carbon-free electricity by 2035, coming just weeks after the country's first large-scale offshore wind farm was approved off the coast of New England. Today, the country has just a handful of offshore wind turbines in the Atlantic Ocean, with around a dozen wind farms being developed in federal waters off the East Coast.

"It's an announcement that will set the stage for the long term development of clean energy and the growth of a brand new made-in-America industry," says national climate adviser Gina McCarthy. "Now we're thinking big and thinking bold."

The agreement identifies two sites off Central and Northern California with the potential to install massive floating wind turbines that could produce 4.6 gigawatts of electricity, enough to power 1.6 million homes.

Interest in offshore wind on the West Coast has grown for years, especially with California's own ambitious goal to cut greenhouse gas emissions. The deep waters off the coast have the potential to produce a significant amount of energy.

But the Defense Department has largely objected to the idea, since the Navy and Air Force use the area for training and testing operations. In response to the growing interest, the Navy released a map in 2017 putting large swaths of California waters off limits.

In 2018, the federal Bureau of Ocean Energy Management solicited interest from wind developers. But negotiations with the Department of Defense have been slow going ever since, effectively blocking wind development off California.

Tuesday's announcement outlines a compromise for a 399-square-mile area off Morro Bay, a site that's appealing to renewable energy companies because of existing transmission lines nearby that once service a retired power plant. It also identifies a location off Humboldt County in Northern California.

"It's our view that the world faces a grave and growing climate crisis," says Dr. Colin Kahl, undersecretary of defense for policy. "Climate change is both a threat to the Department of Defense's operations around the world and an existential challenge to our ability to maintain resilience here at home."

Another key site, just offshore from the Diablo Canyon nuclear power plant, was not included in Tuesday's deal. California's last-remaining nuclear plant is scheduled to completely close by 2025, freeing up more potential transmission lines for offshore wind.

The Biden administration has set a goal of jump-starting the country's offshore wind sector with 30 gigawatts of projects by 2030. Those wind farms will foster tens of thousands of jobs, according to the White House, between renewable energy installers, manufacturers and steelworkers.

"This is a major breakthrough — a major advancement that will allow California to start planning for its carbon-free electricity goals with offshore wind firmly in the picture," says Nancy Rader of the California Wind Energy Association, who also pointed to the challenges. "Offshore wind development off the coast at Morro Bay and Humboldt will require a major port facility in each area to construct the floating platforms and assemble the turbines that will require continued proactive planning by the state and federal governments."

Still, the areas identified in the agreement may not be enough for hitting the administration's clean electricity goal, as well as California's. The state is planning to get 100% of its electricity from zero-emission sources by 2045. To reach that, renewable energy needs to triple statewide with offshore wind playing a key role, reaching 10 GW, according to a recent state analysis. Tuesday's deal could provide just half of that.

A potential lease auction for the offshore wind sites could be held in mid-2022. But the projects will still have to negotiate concerns about the potential impacts on California's fishing industry and shipping channels, as well as any environmental concerns about sensitive ecosystems.

"Far too many questions remain unanswered regarding potential impacts to marine life which is dependent on a healthy ecosystem," says Mike Conroy of the Pacific Coast Federation of Fishermen's Associations. "The fishing industry has been told these areas work best for offshore wind developers; but no one has asked us what areas would work best for us."

Copyright 2021 NPR. To see more, visit https://www.npr.org.

This content is from Southern California Public Radio. View the original story at SCPR.org.




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Psychiatrist – Hourly/Part-Time

Catawba County Social Services (Family NET) is recruiting a highly motivated, customer-oriented individual to work as an hourly/part-time Psychiatrist in a Social Services setting.  This is an opportunity to collaborate in a community setting by providing psychiatric services in conjunction with the outpatient therapy provided by highly skilled clinicians. This position will see children/adolescents who are actively involved in therapy with Family NET, Early Childhood Support Team, or who have successfully achieved their therapy goals and require medication maintenance only. This position will be responsible for making diagnosis and medication management to referred clients.
 
Schedule is negotiable. Typical schedule works 5 hours every other week. The position will work approximately 10 hours per month; there are no benefits associated with this position. 

Salary commensurate with experience




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Catawba Industrial Commons to create manufacturing, distribution and warehousing space for industries

RealtyAnalytix Advisors, LLC announces the introduction of Catawba Industrial Commons, a multi-tenant industrial campus offering the most attractive, affordable and functional manufacturing, distribution and warehousing space in the Greater Catawba County region.




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Social Services' Senior Nutrition Services have a new home

Senior Nutrition Services is now housed at 507 Boundary Street in Conover. Senior Nutrition Services includes Home Delivered Meals (Meals on Wheels), Seniors Morning Out, Nutritional Supplements (Ensure and Boost), Frozen Meals, and In Home Aide Services.




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Lee Industries of Conover to expand, using existing building, adding 75 jobs

Furniture manufacturer Lee Industries, Inc. plans to expand their manufacturing capabilities in Catawba County by extensively redeveloping and renovating the former Conover Chair facility in Conover, N.C. and adding 75 new employees beginning in late 2011. The company will be hiring cutters, sewers, spring-up associates, inside and outside upholsterers, shipping personnel, support staff and more. The average employee wage is expected to be $41,045, nearly $7,000 more than the average pay for workers living in Catawba County.




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Catawba County Assistant Planning Director, Mary George, named 2012 Outstanding Contributor to Agriculture.

Catawba County Assistant Planning Director, Mary George, has been named 2012 Outstanding Contributor to Agriculture by the Hickory Kiwanis Club




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This School District Erased All Holiday Names After Dropping Columbus Day

Some institutions have scrapped Columbus Day or switched to celebrating Indigenous Peoples' Day. One New Jersey school district came up with a new solution: eliminate all holiday names.; Credit: Olesya Semenov/EyeEm via Getty Images

Joe Hernandez | NPR

Memorial Day. Thanksgiving. Labor Day.

You may be used to seeing your calendar punctuated by the various holidays that occur throughout the year.

But on one New Jersey school district's calendar, each one of these days will be listed, simply, as "day off."

It all started when the school board in Randolph Township voted to change Columbus Day to Indigenous Peoples' Day. Some residents were outraged, so the board said that instead it would wipe holiday names from the school calendar altogether while still observing the days off.

"The overwhelming majority of the township population feels that they've [Randolph Township school board members] grossly overstepped their bounds, that they're completely pushing their own personal, political ideologies," Randolph resident Tom Tatem told Fox News. He started a petition calling on school officials to resign.

Institutions across the country are wrestling with the question of what to do with Columbus Day.

Critics have derided the idea of celebrating the Italian explorer, who perpetrated violence on Native Americans when he arrived in the United States. Boosters say it is critical to recognize the contributions of Christopher Columbus, and that Italian-Americans have historically faced discrimination.

Some places have switched to marking Indigenous Peoples' Day in recognition of the Native Americans who occupied the United States long before European explorers like Columbus arrived.

Randolph Township arrived at a novel solution to this problem: eliminate every holiday name to avoid taking a side.

The goal appears to have been to sidestep the debate over Columbus Day, but the Randolph Township school system instead found itself squarely in it, and opponents of the move have called on school officials to resign.

The Randolph Board of Education is now scheduled to convene Monday for a special meeting to reconsider its plan to remove holiday names from the school calendar.

What's happening in New Jersey

In May, the Randolph school board voted unanimously to replace Christopher Columbus Day with Indigenous Peoples' Day.

Some parents grew angry with the decision, but instead of reverting back to the old calendar, the board moved in early June to scrap all holiday names from the school calendar, not giving preference to either one of the October celebrations.

"If we don't have anything on this calendar, then we don't have to have anyone [with] hurt feelings," Randolph school board member Dorene Roche said during a June 10 public meeting, according to NJ.com.

The backlash has only grown.

A petition calling on Randolph Township Schools superintendent Jennifer Fano and members of the board of education to resign has topped 4,000 signatures. "They represent everything that is wrong in education today and are completely incompetent in every aspect of their role," the petition says.

For its part, the school board acknowledged the public outcry but said its decision was misconstrued by some people.

A press release issued by the Randolph board of education on Sunday clarified that the holidays will still be observed as days off and that their decision was not meant to dishonor "the great veterans and the heroes" after which several of those holidays are named.

"These State, Federal and other holidays have not been cancelled or taken away by this Board of Education as some are falsely claiming," the board said. "Everyone is still encouraged to celebrate them in whatever way they deem appropriate."

Matthew Pfouts, director of communications and digital media for the Randolph Township Schools, told NPR the board has no further comment.

Changing views on holidays

On the national level, Columbus Day remains a federal holiday.

But a number of states, including Alaska and Virginia, as well as some cities either observe Indigenous Peoples' Day as a holiday or celebrate it in some way.

The movement away from Columbus Day has not come without controversy.

The New York City Department of Education tried to rename Columbus Day over objections and eventually settled on marking a holiday called "Italian Heritage Day/Indigenous People's Day," which drew its own set of critiques. New York Gov. Andrew Cuomo said it was wrong to make the two groups share one holiday.

There are also other efforts to recognize the role people of color played in American history.

This week, the Senate unanimously passed a bill to make Juneteenth — the day marking the end of slavery in the U.S. — a public holiday.

Copyright 2021 NPR. To see more, visit https://www.npr.org.

This content is from Southern California Public Radio. View the original story at SCPR.org.




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Jury Selection Begins In Trial Of Gunman Involved In Capital Gazette Shooting

Police tape blocks access from a street leading to the building complex where the Capital Gazette is located on June 29, 2018, in Annapolis, Md. The suspect barricaded a back door in an effort to "kill as many people as he could kill," police said.; Credit: Mandel Ngan/AFP via Getty Images

Dominique Maria Bonessi | NPR

Jury selection in the trial of the gunman who fatally shot five employees at the Capital Gazette newspaper in Annapolis, Md., on June 28, 2018 gets underway on Wednesday.

Jarrod Ramos, 41, has pleaded guilty — but not criminally responsible for reason of insanity — in the killings of John McNamara, Rob Hiaasen, Gerald Fischman, Wendi Winters and Rebecca Smith. The mass shooting was one of the deadliest attacks on journalists in modern U.S. history.

"There is a sense that you don't want this to be the thing that makes your life change," Phil Davis, the paper's former criminal justice reporter who now works at the Baltimore Sun, told NPR.

Davis was hiding under his desk while live tweeting the shooting that day. Later, he was part of the Pulitzer Prize-winning team that put out a paper the very next day.

"That's kind of what drove me to continue as a criminal justice reporter. Once I got the feeling of like, 'no we're going to get back to exactly what we do. We're going to tackle this how we would even if it wasn't us and try to go at it from the perspective of a local community newspaper,'" Davis said.

Bruce Shapiro, the executive director of the Columbia University's Dart Center for Journalism and Trauma, said what made this shooting reverberate in newsrooms across the U.S. was "the idea of a newsroom full of colleagues being murdered just because they are journalists. It's an identity based attack."

Attacks on journalists in the U.S. haven't stopped there. During his time in office, President Donald Trump tweeted that the news media is the enemy of the people. Associated Press journalists were threatened and had their equipment damaged by supporters of Trump during the Capitol insurrection on Jan. 6. And last year, during the protests in Minneapolis over the murder of George Floyd by police, the U.S. Press Freedom Tracker reported at least 160 threats to journalists across the country in one week--mostly by police.

Shapiro says the trial is a reminder to the public of the risks and costs local reporters take daily.

"The reality is that local newsrooms all over the country cover extraordinarily difficult events affecting their own families, neighbors, kids, schools whether that is wildfires, whether that is mass shooting, whether that is COVID-19," Shapiro said.

The Capital Gazette trial has been delayed several times due to COVID-19, turnover in the public defender and state's attorney's offices, and rounds of court hearings. Davis says he hopes the long-awaited trial brings some closure.

"Certainly for the families of the victims themselves, I look forward to being on the other end of this trial," he said. "And whatever the outcome is, being able to embrace them and support them just to bring them some sort of closure."

Today, less than a week before the third anniversary of the shooting, the judge has called a pool of 300 people to determine the 12 that will sit as jurors. They will then determine Ramos's mental sanity during the attack.

Steve Mercer, a former Maryland public defender, said the defense has the burden to prove Ramos's sanity. He said that in cases like these, the defense will look at motive and intent. One possible motive, Mercer says, is Ramos' "long-simmering feud with the paper."

Ramos sued the paper for defamation in 2012 after reporters wrote about his guilty plea on charges of criminal harassment and 90-day suspended jail sentence. But that motive might not hold up.

"I think there's a big gap between sort of being upset about a story that's published ... and then going in and committing a mass shooting," Mercer said.

Mercer adds what presents a challenge to both the defense and prosecution is Ramos's conduct after the shooting. He was found by police under a desk at the scene of the shooting with a pump-action shotgun which was purchased legally a few years before.

"The defense may point to it and say that it shows just a disconnect from reality and a lack of awareness of what was going on," Mercer said.

Circuit Court Judge Judge Michael Wachs will ultimately decide if he ends up in prison or a state psychiatric hospital.

Copyright 2021 WAMU 88.5. To see more, visit WAMU 88.5.

This content is from Southern California Public Radio. View the original story at SCPR.org.




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Supreme Court Restricts Police Powers To Enter A Home Without A Warrant

In a case originating with a California Highway Patrol officer's pursuit of a vehicle and ultimately entering the driver's home, the Supreme Court ruled Wednesday that police may not enter homes without a warrant for minor crimes.; Credit: Chris Carlson/AP

Nina Totenberg | NPR

Updated June 23, 2021 at 12:31 PM ET

The U.S. Supreme Court ruled Wednesday that police cannot enter a home without a warrant when pursuing someone for a minor crime.

By a unanimous vote, the court declared that police violated the rights of a California man by pursuing him into his garage for allegedly playing loud music while driving down a deserted two-lane highway late at night.

Writing for the court majority, Justice Elena Kagan said police had no right to enter the man's home without a warrant for such a trivial offense.

"On many occasions, the officer will have good reason to enter – to prevent imminent harms of violence, destruction of evidence, or escape from the home," she wrote. "But when the officer has time to get a warrant, he must do so – even though the misdemeanant fled."

The court's ruling came in the case of Arthur Lange, who was playing loud music in his car late one night, at one point honking his horn several times. A California highway patrol officer, believing Lange was violating a noise ordinance, followed him, and when the motorist slowed to enter his driveway, the officer put on his flashing lights.

Lange, who later said he didn't notice the police car, drove into his garage. The officer, in "hot pursuit," got out of his car and put his foot under the closing garage door sensor to force the door open again. He had no warrant to enter the home, but once inside, he said, he smelled liquor on Lange's breath and arrested him, not only for the noise violation, but also for driving under the influence.

Lange appealed all the way to the Supreme Court, contending that the officer had no right to enter his home without a warrant and that the DUI evidence had been illegally obtained.

The Supreme Court has long held that police may conduct a warrantless search when pursuing a fleeing felon. The question in Lange's case was whether police are free to do the same thing when pursuing someone suspected of a minor offense like playing loud music.

"[P]ursuit of a misdemeanant does not trigger a categorical rule allowing a warrantless home entry," she wrote.

Copyright 2021 NPR. To see more, visit https://www.npr.org.

This content is from Southern California Public Radio. View the original story at SCPR.org.




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Radon, Especially in Combination With Smoking, Contributes to Lung Cancer Deaths

Smokers who are exposed to radon appear to be at even greater risk for lung cancer, because the effects of smoking and radon are more powerful when the two factors are combined, says a new report by a committee of the National Research Council.