pli Pandemic Complicates N.H. Cities' Plans For Dealing With Climate Change-Driven Heat Waves By www.nhpr.org Published On :: Thu, 16 Jul 2020 10:00:00 +0000 New Hampshire is seeing more heat waves due to climate change. And staying cool is even harder this year because of COVID-19. Our new climate change reporting project, By Degrees , has this look at how New Hampshire's cities are coping. Full Article
pli 2024 election results show nation divided on abortion as states split on ballot measures By www.christianpost.com Published On :: Thu, 07 Nov 2024 14:52:30 -0500 The 2024 election yielded mixed results for the pro-life movement, with voters in several states supporting pro-abortion ballot measures as such referendums came up short in other states. Full Article
pli DWC's new deputy commissioner for Compliance and Investigations By www.tdi.texas.gov Published On :: Fri, 3 Nov 2023 00:00:00 CDT Texas Workers' Compensation Commissioner Jeff Nelson has announced the appointment of Dan LaBruyere as DWC's new Deputy Commissioner for Compliance and Investigations, which includes Audits and Investigations, Enforcement, the Fraud Unit, and the Fraud Prosecution Unit. Full Article
pli Energy (In)-Security: The Implications of the Middle East Crisis By english.pravda.ru Published On :: Tue, 27 Aug 2024 18:13:00 +0300 The recent flare-up of conflict in the Middle East, particularly triggered by the assassination of Hamas leader Ismail Haniyeh in Iran by a suspected Israeli airstrike, represents not only a humanitarian and political crisis but also a looming energy crisis ahead. As tensions between Israel, backed by the United States, and Iran, along with its allies like Hezbollah and other Middle Eastern states, intensify, the risks to energy resources and supply routes, both on land and at sea, are becoming increasingly evident. The region's significant oil and gas reserves, crucial to global markets, are now under threat, and any disruption of these supplies could have far-reaching consequences for energy security worldwide. The assassination of Haniyeh, a central figure in Hamas, has ignited a dangerous new phase in the already volatile Middle East. Iran, a key supporter of Hamas and Hezbollah, has found itself at the heart of a growing coalition of Middle Eastern countries rallying against Israel. This development risks drawing the entire region into a broader confrontation, with profound implications not just for regional stability but also for global energy markets. Full Article Opinion
pli Five Il-76 transport aircraft come out of order due to supplies of defective parts By english.pravda.ru Published On :: Mon, 05 Aug 2024 14:01:00 +0300 The Russian Ministry of Defense reported damages of 130 million rubles due to the supplies of defective aircraft parts for the Ilyushin Il-76 military transport aircraft, the Izvestia newspaper wrote about it with reference to a source. It was revealed that the aircraft in operation had counterfeit bearings installed on them. The Investigative Committee for the Moscow Region sad that no further details of the case could be exposed for the interests of the investigation. It was reported that the case was initiated against unidentified persons from among the management of the Balashikha Foundry and Mechanical Plant (BLMZ). According to sources, the plant was recognized as the injured party in the case. Possible violations in the execution of documents for the bearings were committed by the Saratov Bearing Plant from which they were purchased. Full Article Russia
pli CompCourses: Staying in compliance in the Texas workers' compensation system By www.tdi.texas.gov Published On :: Wed, 11 Dec 2024 19:00:00 GMT Staying in compliance in the Texas workers' compensation system Full Article
pli ACDS’ cybersecurity portfolio gains competitive edge from AI-powered thoughtworks application managed services By www.retailtechnologyreview.com Published On :: Thoughtworks, the global technology consultancy that integrates strategy, design and engineering to drive digital innovation, has started a strategic partnership with UK-based cybersecurity startup Advanced Cyber Defence Systems (ACDS) by providing Thoughtworks DAMO AI-powered application managed services. Full Article Surveillance and Security Cyber Security
pli Exploring The Distinctions, Applications, And Development of RFID And NFC Systems By www.retailtechnologyreview.com Published On :: By Alastair Bright, freelance writer.Radio Frequency Identification (RFID) and Near Field Communication (NFC) are two wireless communication technologies that enable data exchange through radio waves. While NFC is primarily used in contactless payments, RFID is widely utilized for asset and location tracking. Both technologies, however, also have versatile applications beyond their primary uses. Full Article RFID Data Capture Retail Supply Chain
pli Diverse range of suppliers compete in growing EPOS market By www.retailtechnologyreview.com Published On :: There were more than two million programmable EPOS units delivered worldwide last year, according to Global EPOS and Self-Checkout 2023, a brand-new study from strategic research and consulting firm RBR Data Services, a division of Datos Insights. Full Article EPoS Systems Critical Issues
pli The Ergonomic Solutions Group’s new SpacePole Kiosk – A modular, configurable and customisable platform for a wide range of self-service applications By www.retailtechnologyreview.com Published On :: Tue, 13 Nov 4040 16:52:00 +0000 The Ergonomic Solutions Group, the designer and manufacturer of technology mounting solutions, has launched the SpacePole Kiosk – described as a multifunctional platform with maximum flexibility for a wide range of self-service applications including self-check-in/check-out, self-ordering, endless aisle, product display & advertising, ticketing, click & collect and many more. Full Article Kiosk Technology
pli Doddle launches self-service kiosks to help simplify returns process By www.retailtechnologyreview.com Published On :: Doddle, the global e-commerce technology provider, has introduced a range of self-service kiosks to its solution portfolio, enabling retailers and carriers to address the challenge of online returns. Full Article Kiosk Technology Internet Retailing Retail Supply Chain
pli Compact high-performance embedded computer for kiosk and robotics applications By www.retailtechnologyreview.com Published On :: Advantech, provider of AIoT platforms and services, has launched ARK-3533, a compact fanless edge computer tailored for kiosk and robotics applications. Full Article Kiosk Technology
pli Brother launches new labellers for quick and compliant wiring By www.retailtechnologyreview.com Published On :: Sun, 13 Nov 3740 17:25:37 +0000 Business technology solutions provider Brother UK has upgraded its professional labelling line-up, launching two new devices to help make compliance easier for electricians and network installers. Full Article Print and Label
pli UK to host Europe’s largest ethnic minority supplier diversity conference By www.retailtechnologyreview.com Published On :: Minority Supplier Development UK (MSDUK) and the European Supplier Diversity Program (ESDP) have announced the final opportunity to register for 2024 Business Diversity Connect, the ethnic minority business (EMB) supplier diversity conference. Full Article Exhibitions and Events Retail Supply Chain
pli Couchbase Capella advancements fuel development of adaptive applications By www.retailtechnologyreview.com Published On :: Couchbase, Inc., the cloud database platform company, has launched Capella Columnar on AWS, which helps organisations streamline the development of adaptive applications by enabling real-time data analysis alongside operational workloads within a single database platform. Full Article Data Capture Retail Supply Chain
pli Barbara Brizuela Embraces Interdisciplinarity as Dean of the School of Arts and Sciences By www.newswise.com Published On :: Mon, 04 Nov 2024 13:50:52 EST Barbara Brizuela, who has been named dean of the School of Arts and Sciences, is a big believer in interdisciplinary research. "Knowledge-seeking has no disciplinary boundaries," says Brizuela. "We're going to need broad and connected perspectives to be able to solve the world's biggest problems." The dean of the Graduate School of Arts and Sciences (GSAS) and professor of education served as the school's dean ad interim since July. Her appointment to lead the School of Arts and Sciences builds on a long and distinguished career as a teacher, mentor, researcher, and administrator. Full Article
pli Lean Start-Up in Settings of Impoverishment: The Implications of the Context for Theory By www.newswise.com Published On :: Wed, 06 Nov 2024 10:20:48 EST Full Article
pli Ace of Swords Reversed: Symbolism and Spiritual Implications By entertainment.howstuffworks.com Published On :: Tue, 12 Nov 2024 05:00:03 -0500 Discover the meaning of the Ace of Swords reversed in tarot. Explore its insights on clarity, communication, and inner conflicts in love, career, and personal growth. Full Article
pli Sino-US Decoupling Forecast to Intensify, Preference for US Interests to Expand under Trump Gov't By world.kbs.co.kr Published On :: Wed, 13 Nov 2024 17:16:57 +0900 [Economy] : Sino-U.S. decoupling is forecast to intensify and preference for U.S. interests to expand under the incoming Donald Trump administration. This outlook was put forth Wednesday at a seminar hosted by the Korea International Trade Association(KITA). Kyung Hee University Professor Seo Jung-kun pointed to a ...[more...] Full Article Economy
pli Polymorph sampling with coupling to extended variables: enhanced sampling of polymorph energy landscapes and free energy perturbation of polymorph ensembles By journals.iucr.org Published On :: 2024-10-15 A novel approach to computationally enhance the sampling of molecular crystal structures is proposed and tested. This method is based on the use of extended variables coupled to a Monte Carlo based crystal polymorph generator. Inspired by the established technique of quasi-random sampling of polymorphs using the rigid molecule constraint, this approach represents molecular clusters as extended variables within a thermal reservoir. Polymorph unit-cell variables are generated using pseudo-random sampling. Within this framework, a harmonic coupling between the extended variables and polymorph configurations is established. The extended variables remain fixed during the inner loop dedicated to polymorph sampling, enforcing a stepwise propagation of the extended variables to maintain system exploration. The final processing step results in a polymorph energy landscape, where the raw structures sampled to create the extended variable trajectory are re-optimized without the thermal coupling term. The foundational principles of this approach are described and its effectiveness using both a Metropolis Monte Carlo type algorithm and modifications that incorporate replica exchange is demonstrated. A comparison is provided with pseudo-random sampling of polymorphs for the molecule coumarin. The choice to test a design of this algorithm as relevant for enhanced sampling of crystal structures was due to the obvious relation between molecular structure variables and corresponding crystal polymorphs as representative of the inherent vapor to crystal transitions that exist in nature. Additionally, it is shown that the trajectories of extended variables can be harnessed to extract fluctuation properties that can lead to valuable insights. A novel thermodynamic variable is introduced: the free energy difference between ensembles of Z' = 1 and Z' = 2 crystal polymorphs. Full Article text
pli X-ray crystallographic structure of a novel enantiopure chiral isothiourea with potential applications in enantioselective synthesis By journals.iucr.org Published On :: 2024-01-01 The synthesis of a chiral isothiourea, namely, (4aR,8aR)-3-phenyl-4a,5,6,7,8,8a-hexahydrobenzo[4,5]imidazo[2,1-b]thiazol-9-ium bromide, C15H17N2S+·Br−, with potential organocatalytic and anti-inflammatory activity is reported. The preparation of the heterocycle of interest was carried out in two high-yielding steps. The hydrobromide salt of the isothiourea of interest provided suitable crystals for X-ray diffraction analysis, the results of which are reported. Salient observations from this analysis are the near perpendicular arrangement of the phenyl ring and the mean plane of the heterocycle. This conformational characteristic may be relevant with regard the stereoselectivity induced by the chiral isothiourea in asymmetric reactions. Furthermore, evidence was found for the existence of an S...Br− halogen bond. Full Article text
pli Advanced EXAFS analysis techniques applied to the L-edges of the lanthanide oxides By journals.iucr.org Published On :: The L-edge EXAFS of the entire set of lanthanide oxides were collected and modeled, taking into consideration the aggregation of inequivalent absorbing sites, geometric parameterization of the crystal lattice and multielectron excitation removal. Full Article text
pli A new modular framework for high-level application development at HEPS By journals.iucr.org Published On :: 2024-02-01 As a representative of the fourth-generation light sources, the High Energy Photon Source (HEPS) in Beijing, China, utilizes a multi-bend achromat lattice to obtain an approximately 100 times emittance reduction compared with third-generation light sources. New technologies bring new challenges to operate the storage ring. In order to meet the beam commissioning requirements of HEPS, a new framework for the development of high-level applications (HLAs) has been created. The key part of the new framework is a dual-layer physical module to facilitate the seamless fusion of physical simulation models with the real machine, allowing for fast switching between different simulation models to accommodate the various simulation scenarios. As a framework designed for development of physical applications, all variables are based on physical quantities. This allows physicists to analytically assess measurement parameters and optimize machine parameters in a more intuitive manner. To enhance both extensibility and adaptability, a modular design strategy is utilized, partitioning the entire framework into discrete modules in alignment with the requirements of HLA development. This strategy not only facilitates the independent development of each module but also minimizes inter-module coupling, thereby simplifying the maintenance and expansion of the entire framework. To simplify the development complexity, the design of the new framework is implemented using Python and is called Python-based Accelerator Physics Application Set (Pyapas). Taking advantage of Python's flexibility and robust library support, we are able to develop and iterate quickly, while also allowing for seamless integration with other scientific computing applications. HLAs for both the HEPS linac and booster have been successfully developed. During the beam commissioning process at the linac, Pyapas's ease of use and reliability have significantly reduced the time required for the beam commissioning operators. As a development framework for HLA designed for the new-generation light sources, Pyapas has the versatility to be employed with HEPS, as well as with other comparable light sources, due to its adaptability. Full Article text
pli Development and performance simulations of a soft X-ray and XUV split-and-delay unit at beamlines FL23/24 at FLASH2 for time-resolved two-color pump–probe experiments By journals.iucr.org Published On :: 2024-08-05 The split-and-delay unit (SDU) at FLASH2 will be upgraded to enable the simultaneous operation of two temporally, spatially and spectrally separated probe beams when the free-electron laser undulators are operated in a two-color scheme. By means of suitable thin filters and an optical grating beam path a wide range of combinations of photon energies in the spectral range from 150 eV to 780 eV can be chosen. In this paper, simulations of the spectral transmission and performance parameters of the filter technique are discussed, along with a monochromator with dispersion compensation presently under construction. Full Article text
pli Double-edge scan wavefront metrology and its application in crystal diffraction wavefront measurements By journals.iucr.org Published On :: 2024-07-29 Achieving diffraction-limited performance in fourth-generation synchrotron radiation sources demands monochromator crystals that can preserve the wavefront across an unprecedented extensive range. There is an urgent need for techniques of absolute crystal diffraction wavefront measurement. At the Beijing Synchrotron Radiation Facility (BSRF), a novel edge scan wavefront metrology technique has been developed. This technique employs a double-edge tracking method, making diffraction-limited level absolute crystal diffraction wavefront measurement a reality. The results demonstrate an equivalent diffraction surface slope error below 70 nrad (corresponding to a wavefront phase error of 4.57% λ) r.m.s. within a nearly 6 mm range for a flat crystal in the crystal surface coordinate. The double-edge structure contributes to exceptional measurement precision for slope error reproducibility, achieving levels below 15 nrad (phase error reproducibility < λ/100) even at a first-generation synchrotron radiation source. Currently, the measurement termed double-edge scan (DES) has already been regarded as a critical feedback mechanism in the fabrication of next-generation crystals. Full Article text
pli MLgrating: a program for simulating multilayer gratings for tender X-ray applications By journals.iucr.org Published On :: 2024-08-01 Multilayer gratings are increasingly popular optical elements at X-ray beamlines, as they can provide much higher photon flux in the tender X-ray range compared with traditional single-layer coated gratings. While there are several proprietary software tools that provide the functionality to simulate the efficiencies of such gratings, until now the X-ray community has lacked an open-source alternative. Here MLgrating is presented, a program for simulating the efficiencies of both multilayer gratings and single-layer coated gratings for X-ray applications. MLgrating is benchmarked by comparing its output with that of other software tools and plans are discussed for how the program could be extended in the future. Full Article text
pli The success rate of processed predicted models in molecular replacement: implications for experimental phasing in the AlphaFold era By journals.iucr.org Published On :: 2024-10-03 The availability of highly accurate protein structure predictions from AlphaFold2 (AF2) and similar tools has hugely expanded the applicability of molecular replacement (MR) for crystal structure solution. Many structures can be solved routinely using raw models, structures processed to remove unreliable parts or models split into distinct structural units. There is therefore an open question around how many and which cases still require experimental phasing methods such as single-wavelength anomalous diffraction (SAD). Here, this question is addressed using a large set of PDB depositions that were solved by SAD. A large majority (87%) could be solved using unedited or minimally edited AF2 predictions. A further 18 (4%) yield straightforwardly to MR after splitting of the AF2 prediction using Slice'N'Dice, although different splitting methods succeeded on slightly different sets of cases. It is also found that further unique targets can be solved by alternative modelling approaches such as ESMFold (four cases), alternative MR approaches such as ARCIMBOLDO and AMPLE (two cases each), and multimeric model building with AlphaFold-Multimer or UniFold (three cases). Ultimately, only 12 cases, or 3% of the SAD-phased set, did not yield to any form of MR tested here, offering valuable hints as to the number and the characteristics of cases where experimental phasing remains essential for macromolecular structure solution. Full Article text
pli Importance of powder diffraction raw data archival in a curated database for materials science applications By journals.iucr.org Published On :: 2024-08-26 In recent years, there is a significant interest from the crystallographic and materials science communities to have access to raw diffraction data. The effort in archiving raw data for access by the user community is spearheaded by the International Union of Crystallography (IUCr) Committee on Data. In materials science, where powder diffraction is extensively used, the challenge in archiving raw data is different to that from single crystal data, owing to the very nature of the contributions involved. Powder diffraction (X-ray or neutron) data consist of contributions from the material under study as well as instrument specific parameters. Having raw powder diffraction data can be essential in cases of analysing materials with poor crystallinity, disorder, micro structure (size/strain) etc. Here, the initiative and progress made by the International Centre for Diffraction Data (ICDDR) in archiving powder X-ray diffraction raw data in the Powder Diffraction FileTM (PDFR) database is outlined. The upcoming 2025 release of the PDF-5+ database will have more than 20 800 raw powder diffraction patterns that are available for reference. Full Article text
pli Coupling between 2-pyridylselenyl chloride and phenylselenocyanate: synthesis, crystal structure and non-covalent interactions By journals.iucr.org Published On :: 2024-09-17 A new pyridine-fused selenodiazolium salt, 3-(phenylselanyl)[1,2,4]selenadiazolo[4,5-a]pyridin-4-ylium chloride dichloromethane 0.352-solvate, C12H9N2Se2+·Cl−·0.352CH2Cl2, was obtained from the reaction between 2-pyridylselenenyl chloride and phenylselenocyanate. Single-crystal structural analysis revealed the presence of C—H⋯N, C—H⋯Cl−, C—H⋯Se hydrogen bonds as well as chalcogen–chalcogen (Se⋯Se) and chalcogen–halogen (Se⋯Cl−) interactions. Non-covalent interactions were explored by DFT calculations followed by topological analysis of the electron density distribution (QTAIM analysis). The structure consists of pairs of selenodiazolium moieties arranged in a head-to-tail fashion surrounding disordered dichloromethane molecules. The assemblies are connected by C—H⋯Cl− and C—H⋯N hydrogen bonds, forming layers, which stack along the c-axis direction connected by bifurcated Se⋯Cl−⋯H—C interactions. Full Article text
pli Structural multiplicity in a solvated hydrate of the antiretroviral protease inhibitor Lopinavir By journals.iucr.org Published On :: 2024-10-24 Lopinavir is a potent protease inhibitor that is used as a first-line pharmaceutical drug for the treatment of HIV. The multi-component solvated Lopinavir crystal, systematic name (2S)-N-[(2S,4S,5S)-5-[2-(2,6-dimethylphenoxy)acetamido]-4-hydroxy-1,6-diphenylhexan-2-yl]-3-methyl-2-(2-oxo-1,3-diazinan-1-yl)butanamide–ethane-1,2-diol–water (8/3/7) 8C37H48N4O5·3C2H6O2·7H2O, was prepared using evaporative methods. The crystalline material obtained from this experimental synthesis was characterized and elucidated by single-crystal X-ray diffraction (SC-XRD). The crystal structure is unusual in that the unit cell contains 18 molecules. The stoichiometric ratio of this crystal is eight Lopinavir molecules [8(C37H48N4O5)], three ethane-1,2-diol molecules [3(C2H6O2)] and seven water molecules [7(H2O)]. The crystal packing features both bi- and trifurcated hydrogen bonds between atoms. Full Article text
pli Operation model of a skew-symmetric split-crystal neutron interferometer By journals.iucr.org Published On :: 2024-02-01 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. Full Article text
pli Tripling of the scattering vector range of X-ray reflectivity on liquid surfaces using a double-crystal deflector By journals.iucr.org Published On :: 2024-02-16 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. Full Article text
pli Applications of the Clifford torus to material textures By journals.iucr.org Published On :: 2024-04-15 This paper introduces a new 2D representation of the orientation distribution function for an arbitrary material texture. The approach is based on the isometric square torus mapping of the Clifford torus, which allows for points on the unit quaternion hypersphere (each corresponding to a 3D orientation) to be represented in a periodic 2D square map. The combination of three such orthogonal mappings into a single RGB (red–green–blue) image provides a compact periodic representation of any set of orientations. Square torus representations of five different orientation sampling methods are compared and analyzed in terms of the Riesz s energies that quantify the uniformity of the samplings. The effect of crystallographic symmetry on the square torus map is analyzed in terms of the Rodrigues fundamental zones for the rotational symmetry groups. The paper concludes with example representations of important texture components in cubic and hexagonal materials. The new RGB representation provides a convenient and compact way of generating training data for the automated analysis of material textures by means of neural networks. Full Article text
pli Implications of size dispersion on X-ray scattering of crystalline nanoparticles: CeO2 as a case study By journals.iucr.org Published On :: 2024-05-31 Controlling the shape and size dispersivity and crystallinity of nanoparticles (NPs) has been a challenge in identifying these parameters' role in the physical and chemical properties of NPs. The need for reliable quantitative tools for analyzing the dispersivity and crystallinity of NPs is a considerable problem in optimizing scalable synthesis routes capable of controlling NP properties. The most common tools are electron microscopy (EM) and X-ray scattering techniques. However, each technique has different susceptibility to these parameters, implying that more than one technique is necessary to characterize NP systems with maximum reliability. Wide-angle X-ray scattering (WAXS) is mandatory to access information on crystallinity. In contrast, EM or small-angle X-ray scattering (SAXS) is required to access information on whole NP sizes. EM provides average values on relatively small ensembles in contrast to the bulk values accessed by X-ray techniques. Besides the fact that the SAXS and WAXS techniques have different susceptibilities to size distributions, SAXS is easily affected by NP–NP interaction distances. Because of all the variables involved, there have yet to be proposed methodologies for cross-analyzing data from two techniques that can provide reliable quantitative results of dispersivity and crystallinity. In this work, a SAXS/WAXS-based methodology is proposed for simultaneously quantifying size distribution and degree of crystallinity of NPs. The most reliable easy-to-access size result for each technique is demonstrated by computer simulation. Strategies on how to compare these results and how to identify NP–NP interaction effects underneath the SAXS intensity curve are presented. Experimental results are shown for cubic-like CeO2 NPs. WAXS size results from two analytical procedures are compared, line-profile fitting of individual diffraction peaks in opposition to whole pattern fitting. The impact of shape dispersivity is also evaluated. Extension of the proposed methodology for cross-analyzing EM and WAXS data is possible. Full Article text
pli Subperiodic groups, line groups and their applications By journals.iucr.org Published On :: 2024-05-31 Understanding the symmetries described by subperiodic groups – frieze, rod and layer groups – has been instrumental in predicting various properties (band structures, optical absorption, Raman spectra, diffraction patterns, topological properties etc.) of `low-dimensional' crystals. This knowledge is crucial in the tailored design of materials for specific applications across electronics, photonics and materials engineering. However, there are materials that have the property of being periodic only in one direction and whose symmetry cannot be described by the subperiodic rod groups. Describing the symmetry of these materials necessitates the application of line group theory. This paper gives an overview of subperiodic groups while briefly introducing line groups in order to acquaint the crystallographic community with these symmetries and direct them to pertinent literature. Since line groups are generally not subperiodic, they have thus far remained outside the realm of symmetries traditionally considered in crystallography, although there are numerous `one-dimensional' crystals (i.e. monoperiodic structures) possessing line group symmetry. Full Article text
pli Application of laboratory micro X-ray fluorescence devices for X-ray topography By journals.iucr.org Published On :: 2024-05-17 It is demonstrated that high-resolution energy-dispersive X-ray fluorescence mapping devices based on a micro-focused beam are not restricted to high-speed analyses of element distributions or to the detection of different grains, twins and subgrains in crystalline materials but can also be used for the detection of dislocations in high-quality single crystals. Si single crystals with low dislocation densities were selected as model materials to visualize the position of dislocations by the spatially resolved measurement of Bragg-peak intensity fluctuations. These originate from the most distorted planes caused by the stress fields of dislocations. The results obtained by this approach are compared with laboratory-based Lang X-ray topographs. The presented methodology yields comparable results and it is of particular interest in the field of crystal growth, where fast chemical and microstructural characterization feedback loops are indispensable for short and efficient development times. The beam divergence was reduced via an aperture management system to facilitate the visualization of dislocations for virtually as-grown, non-polished and non-planar samples with a very pronounced surface profile. Full Article text
pli Coordinate-based simulation of pair distance distribution functions for small and large molecular assemblies: implementation and applications By journals.iucr.org Published On :: 2024-09-17 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. Full Article text
pli X-ray ghost imaging with a specially developed beam splitter By journals.iucr.org Published On :: 2024-09-30 X-ray ghost imaging with a crystal beam splitter has advantages in highly efficient imaging due to the simultaneous acquisition of signals from both the object beam and reference beam. However, beam splitting with a large field of view, uniform distribution and high correlation has been a great challenge up to now. Therefore, a dedicated beam splitter has been developed by optimizing the optical layout of a synchrotron radiation beamline and the fabrication process of a Laue crystal. A large field of view, consistent size, uniform intensity distribution and high correlation were obtained simultaneously for the two split beams. Modulated by a piece of copper foam upstream of the splitter, a correlation of 92% between the speckle fields of the object and reference beam and a Glauber function of 1.25 were achieved. Taking advantage of synthetic aperture X-ray ghost imaging (SAXGI), a circuit board of size 880 × 330 pixels was successfully imaged with high fidelity. In addition, even though 16 measurements corresponding to a sampling rate of 1% in SAXGI were used for image reconstruction, the skeleton structure of the circuit board can still be determined. In conclusion, the specially developed beam splitter is applicable for the efficient implementation of X-ray ghost imaging. Full Article text
pli Foreword to the special virtual issue on X-ray spectroscopy to understand functional materials: instrumentation, applications, data analysis By journals.iucr.org Published On :: 2024-10-21 Full Article text
pli HMRC appoints Modulr as its new CoP supplier By thepaypers.com Published On :: Mon, 11 Nov 2024 11:31:00 +0100 HMRC has appointed Full Article
pli Yuno unveils 'Payout' to simplify global payments for merchants By thepaypers.com Published On :: Tue, 29 Oct 2024 08:40:00 +0100 Yuno, a provider of payment orchestration, has... Full Article
pli iDenfy launches new data crossmatch tool to improve KYB compliance By thepaypers.com Published On :: Wed, 13 Nov 2024 08:08:00 +0100 Lithuania-based iDenfy has introduced an AI-powered Data Crossmatch feature aimed at improving the Know Your Business (KYB) compliance process. Full Article
pli The Plight of Yukon River Chinook Salmon By www.usgs.gov Published On :: Fri, 1 Nov 2024 16:33:53 EDT Adult Chinook salmon in Alaska and Canada are in trouble, and USGS WFRC scientists are in a race against the clock to find the cause behind their disappearance and a viable solution. A staple in many diets, this salmon species is considered a lifeblood of the region. Full Article
pli Top 5 Compliance Challenges Keeping IT Directors Awake At Night By www.itsecurity.com Published On :: Wed, 11 Nov 2009 23:26:19 +0000 On-Demand Webinar > Watch Now! SPONSORED BY: TripwireWatch this FREE on-demand webinar to learn how to overcome the top 5 compliance challenges keeping IT directors awake at night! Watch Now! Overc... Full Article
pli Driving IT Cost-Efficiency, Security and Compliance in 2010 By www.itsecurity.com Published On :: Wed, 03 Feb 2010 01:30:36 +0000 On-Demand Webcast>Watch Now! SPONSORED BY: TripwireWatch this FREE on-demand webcast and hear from leading IT experts about ways organizations are leveraging technologies such as virtualizatio... Full Article
pli How to Replicate the World's 10 Most Amazing Network Failures By www.itsecurity.com Published On :: Sat, 20 Feb 2010 00:50:26 +0000 On-Demand Webinar > Watch Now!SPONSORED BY: Juniper NetworksWatch this FREE on-demand webinar to hear the experts walk you through the 10 most famous outages and how to make sure you avoid anything... Full Article
pli Oil steady as economic slowdown worries offsets tight supplies By cio.economictimes.indiatimes.com Published On :: Wed, 20 Jul 2022 08:34:40 +0530 Oil prices have whipsawed between concerns over supply as Western sanctions on Russian crude and products over the Ukraine war disrupt trade flows, and worries that central bank efforts to tame inflation may trigger a demand-destroying recession. Full Article
pli Reuse of Disposable Medical Masks During Flu Pandemic Not Recommended - Reusing Respirators Is Complicated By Published On :: Thu, 27 Apr 2006 05:00:00 GMT Use of protective face coverings will be one of many strategies used to slow or prevent transmission of the flu virus in the event of a pandemic, even though scientific evidence about the effectiveness of inexpensive, disposable medical masks and respirators against influenza is limited. Full Article
pli Preterm Births Cost U.S. $26 Billion a Year - Multidisciplinary Research Effort Needed to Prevent Early Births By Published On :: Thu, 13 Jul 2006 05:00:00 GMT The high rate of premature births in the United States constitutes a public health concern that costs society at least $26 billion a year, according to a new report from the Institute of Medicine of the National Academies. Full Article