gen Agency closed By www.tdi.texas.gov Published On :: Wed, 25 Dec 2024 06:00:00 GMT Agency closed Full Article
gen Agency closed By www.tdi.texas.gov Published On :: Tue, 24 Dec 2024 06:00:00 GMT Agency closed Full Article
gen Agency closed in the afternoon By www.tdi.texas.gov Published On :: Mon, 23 Dec 2024 18:00:00 GMT Agency closed in the afternoon Full Article
gen Agency closed By www.tdi.texas.gov Published On :: Fri, 29 Nov 2024 06:00:00 GMT Agency closed Full Article
gen Agency closed for Thanksgiving By www.tdi.texas.gov Published On :: Thu, 28 Nov 2024 06:00:00 GMT Agency closed for Thanksgiving Full Article
gen Agency closed in the afternoon By www.tdi.texas.gov Published On :: Wed, 27 Nov 2024 18:00:00 GMT Agency closed in the afternoon Full Article
gen Designing for Gen Z: What do digital natives really want in a mobile app? By www.retailtechnologyreview.com Published On :: As digital natives, Gen Z - those aged 10 to 25 - have been surrounded by technology, social media, mobile devices, and the internet their entire lives. Full Article Mobile Computers Critical Issues
gen Flashpoint Cyber Threat Intelligence Index: Midyear Edition is live By www.retailtechnologyreview.com Published On :: Flashpoint has released its midyear Cyber Threat Intelligence Index, with new data and trends surrounding both persistent and emerging cyber threats observed from 1 January to 30 June, 2024. The report includes research and data tied to vulnerabilities, information-stealing malware, ransomware and insider threats. Full Article Surveillance and Security Critical Issues
gen Toshiba’s next-generation S300 Pro Surveillance HDDs for large-scale video surveillance systems By www.retailtechnologyreview.com Published On :: Toshiba Electronics Europe GmbH (Toshiba) has introduced its next-generation S300 Pro Surveillance Hard Disk Drives (HDDs) targeting the latest requirements in the surveillance storage market. Full Article Surveillance and Security
gen Retailers adopt strategies previously exclusive to law enforcement and federal agencies By www.retailtechnologyreview.com Published On :: Thu, 13 Nov 8600 17:25:43 +0000 As AI regulations in the US have evolved to be more supportive of commercial use, retailers and malls are increasingly adopting technologies that were once the domain of law enforcement and federal agencies. This shift is driven by the need for enhanced security and operational efficiency, with many turning to advanced video analytics and facial intelligence. Full Article Surveillance and Security Data Capture Critical Issues
gen Retail Sector - Cyber Threat Intelligence Report 2024 By www.retailtechnologyreview.com Published On :: NCC Group have just released a free CyberSecurity Threat Intelligence Report for the Retail sector as it enters its busiest spell, the "GoldenQuarter".It will help retailers manage an increasing surge in demand across their IT operations and supply chains. Full Article Critical Issues Surveillance and Security Internet Retailing Cyber Security
gen Singapore’s Cyber Security Agency award Veracity Trust Network S$1 million Grant to develop and deliver AI-powered bot detection By www.retailtechnologyreview.com Published On :: Tue, 13 Nov 3900 17:31:48 +0000 Veracity Trust Network (Veracity) has been awarded the Cybersecurity Co-Innovation and Development Fund (CCDF) CyberCall grant of S$1 million by the Cyber Security Agency Singapore (CSA). Full Article Cyber Security Artificial Intelligence
gen Court orders arrest of Volkswagen's Russian assets By english.pravda.ru Published On :: Mon, 20 Mar 2023 12:42:00 +0300 The Arbitration Court of the Nizhny Novgorod region arrested all assets of German automaker Volkswagen in Russia, Interfax reports. Since March 17, Volkswagen has been banned from conducting any registration actions, such as actions to liquidate, reorganise or change the composition of participants, increase and decrease the authorized capital of the Russian subsidiary of Volkswagen and its legal entities. Volkswagen's assets in Russia ere banned following a court appeal from Russia's GAZ automobile group from March 14. The document was published in the file of arbitration cases. Full Article Business
gen Manhattan Active Point of Sale unveils the next generation of store associate experience By www.retailtechnologyreview.com Published On :: Wed, 13 Nov 4897 17:05:48 +0000 Manhattan Associates Inc. has announced significant enhancements to its Manhattan Active Point of Sale (POS) application designed to meet the dynamic needs of modern store associates. Full Article EPoS Systems Retail Supply Chain
gen Janam launches next-generation self-credentialing kiosk By www.retailtechnologyreview.com Published On :: Mon, 13 Nov 4800 16:48:50 +0000 Janam Technologies, provider of rugged mobile computers and contactless access solutions, has introduced the newest addition to its Guardian family of access management hardware solutions. Full Article Kiosk Technology
gen NMFTA influences next generation of cybersecurity professionals at CyberTruck Challenge By www.retailtechnologyreview.com Published On :: Sat, 13 Nov 4460 17:20:54 +0000 The National Motor Freight Traffic Association, Inc. (NMFTA) served as the lead sponsor for the CyberTruck Challenge. This year marked the third year that NMFTA had served in this sponsorship role. Full Article Surveillance and Security Exhibitions and Events Cyber Security
gen Russian general killed in special military operation zone By english.pravda.ru Published On :: Fri, 08 Nov 2024 20:34:00 +0300 Major General Pavel Klimenko was killed in the zone of the special military operation in Ukraine. He commanded the 5th separate motorized rifle brigade, which was previously part of the People's Militia of the Donetsk People's Republic. No circumstances of the general's death were provided. Pavel Klimenko held the title of Hero of the DPR, had two Orders of Courage, the Order of Alexander Nevsky and the Medal "For Bravery". Full Article Incidents
gen gStore by GreyOrange unveils SoftFence - Next-generation virtual shielding for RFID-driven retail operations By www.retailtechnologyreview.com Published On :: GreyOrange Inc. has introduced SoftFence, a virtual shielding technology from its retail software as a service (SaaS) platform, gStore. Full Article RFID Data Capture Retail Supply Chain Cloud Computing
gen Global study from Checkout.com reveals Generation Alpha’s rising influence in Digital Economy By www.retailtechnologyreview.com Published On :: Sat, 13 Nov 6060 17:29:50 +0000 A global study by Checkout.com, the global digital payments company, highlights the consumer buying behaviour which is powering today’s digital economy. The research, conducted across the UK, US, UAE and China, reveals a number of trends, including the growing spending power of Generation Alpha. Full Article Data Capture Retail Supply Chain Critical Issues Payment Technology
gen Study reveals connection between estrogen levels and a risk of dementia By english.pravda.ru Published On :: Thu, 07 Apr 2022 14:41:00 +0300 A research group from the George Institute for Global Health in Australia found out that the estrogen levels can be an indicator of a woman's risk of developing dementia. The researchers suggest that some of the reproductive factors (early or late menstruation, early menopause) are a sign of a higher risk of certain neurological problems connected with cognitive and social skills. According to the PloS Medicine journal, pregnancy and abortion are connected with the lower risk of dementia and other neurological problems. Full Article Health
gen Gene Therapy Protects Against Motor Neuron Disease in Rats By www.newswise.com Published On :: Tue, 12 Nov 2024 11:30:51 EST University of Wisconsin-Madison researchers targeting a group of hereditary neurodegenerative diseases have found success using a gene therapy treatment in an animal model. The approach, which uses CRISPR-Cas9 genome editing technology, offers a unique and promising strategy that could one day treat rare but debilitating motor neuron diseases in humans. Full Article
gen Discovery of 2,586 Orphan Genes in Rosa Chinensis Provides Insights Into Stress Adaptation and Flower Development By www.newswise.com Published On :: Wed, 13 Nov 2024 01:50:12 EST A research team has identified 2,586 orphan genes (OGs) in Rosa chinensis, offering new insights into the role of these unique genes in flower development, stress response, and environmental adaptation. Full Article
gen First-Generation Nursing Student Dallas Martin Finds Success at UA Little Rock By www.newswise.com Published On :: Mon, 11 Nov 2024 10:50:47 EST Dallas Martin, a first-generation senior nursing major from Helena, Arkansas, really does it all. This wife and mom of two is a full-time student at UA Little Rock, set to graduate in December with her bachelor's degree in nursing, while also working full-time as a physician's registered nurse in oncology and hematology at Carti Cancer Center in Little Rock. Full Article
gen Expert Available: GOP Sets Sights on Legislative Agenda for Trump's First 100 Days By www.newswise.com Published On :: Mon, 11 Nov 2024 12:00:36 EST House Republicans are preparing a legislative agenda for Trump's first 100 days in office. ... Full Article
gen Discovery of 2,586 Orphan Genes in Rosa Chinensis Provides Insights Into Stress Adaptation and Flower Development By www.newswise.com Published On :: Wed, 13 Nov 2024 01:50:12 EST A research team has identified 2,586 orphan genes (OGs) in Rosa chinensis, offering new insights into the role of these unique genes in flower development, stress response, and environmental adaptation. Full Article
gen First Case of Highly Pathogenic AI This Fall Confirmed in Gangwon Province By world.kbs.co.kr Published On :: Wed, 30 Oct 2024 17:18:54 +0900 [Domestic] : The nation has confirmed its first case of highly pathogenic avian influenza so far this fall season at a poultry farm in Gangwon Province. Quarantine authorities said Wednesday that the birds at the farm in Donghae had the highly pathogenic H5N1 strain of the virus. The farm, which raises some 700 ...[more...] Full Article Domestic
gen Oceans Minister Holds Emergency Meeting on Sunken Fishing Boat By world.kbs.co.kr Published On :: Fri, 08 Nov 2024 18:56:00 +0900 [Domestic] : Minister of Oceans and Fisheries Kang Do-hyung has held an emergency meeting to check up the search of 12 missing crew members of a fishing boat that sank in waters off Jeju Island on Friday morning. Officials from the interior, defense ministries, the Korea Coast Guard and governments of Busan and Jeju ...[more...] Full Article Domestic
gen Golfer An Byeong-hun Wins Genesis Championship After All-Korean Playoff By world.kbs.co.kr Published On :: Mon, 28 Oct 2024 15:08:48 +0900 [Sports] : South Korean golfer An Byeong-hun claimed his first DP World Tour victory in nine years, defeating compatriot Kim Joo-hyung on Sunday in a playoff on home soil. At Jack Nicklaus Golf Club Korea in Incheon, during the final round of the 2024 Genesis Championship, An secured his second career win on the DP ...[more...] Full Article Sports
gen Quarantine Agency Develops Differential Diagnosis Technology for Lumpy Skin Disease By world.kbs.co.kr Published On :: Wed, 25 Sep 2024 16:57:36 +0900 [Science] : The Animal and Plant Quarantine Agency says it has developed, for the first time in the world, a differential diagnosis technology for lumpy skin disease(LSD), a viral disease that affects cattle. With the technology, jointly developed with Median Diagnostics, it can be determined within eight hours if a ...[more...] Full Article Science
gen Space Agency to Develop Lunar Module to be Sent to Moon by 2032 By world.kbs.co.kr Published On :: Mon, 04 Nov 2024 17:44:41 +0900 [Science] : The Korea AeroSpace Administration and the Korea Aerospace Research Institute are set to proceed with the development of a lunar module after signing an agreement on the second phase of the nation’s moon exploration project. According to the state agency on Monday, some 530 billion won, or around 386 ...[more...] Full Article Science
gen Gen Z Age Range, Traits and Nicknames By people.howstuffworks.com Published On :: Tue, 12 Nov 2024 10:20:03 -0500 What is unique about Generation Z? Learn more about Generation Z at HowStuffWorks. Full Article
gen Government and agencies - British Geological Survey By news.google.com Published On :: Thu, 24 Sep 2020 01:16:40 GMT Government and agencies British Geological Survey Full Article
gen Funding awarded for study on hydrogen storage potential in the East Midlands - British Geological Survey By news.google.com Published On :: Mon, 19 Aug 2024 07:00:00 GMT Funding awarded for study on hydrogen storage potential in the East Midlands British Geological Survey Full Article
gen Exploiting fourth-generation synchrotron radiation for enzyme and photoreceptor characterization By journals.iucr.org Published On :: (Time-resolved) macromolecular crystallography at the new ESRF-ID29 beamline is described. Full Article text
gen The seventh blind test of crystal structure prediction: structure generation methods By journals.iucr.org Published On :: The results of the seventh blind test of crystal structure prediction are presented, focusing on structure generation methods. Full Article text
gen The seventh blind test of crystal structure prediction: structure generation methods By journals.iucr.org Published On :: 2024-12-01 A seventh blind test of crystal structure prediction was organized by the Cambridge Crystallographic Data Centre featuring seven target systems of varying complexity: a silicon and iodine-containing molecule, a copper coordination complex, a near-rigid molecule, a cocrystal, a polymorphic small agrochemical, a highly flexible polymorphic drug candidate, and a polymorphic morpholine salt. In this first of two parts focusing on structure generation methods, many crystal structure prediction (CSP) methods performed well for the small but flexible agrochemical compound, successfully reproducing the experimentally observed crystal structures, while few groups were successful for the systems of higher complexity. A powder X-ray diffraction (PXRD) assisted exercise demonstrated the use of CSP in successfully determining a crystal structure from a low-quality PXRD pattern. The use of CSP in the prediction of likely cocrystal stoichiometry was also explored, demonstrating multiple possible approaches. Crystallographic disorder emerged as an important theme throughout the test as both a challenge for analysis and a major achievement where two groups blindly predicted the existence of disorder for the first time. Additionally, large-scale comparisons of the sets of predicted crystal structures also showed that some methods yield sets that largely contain the same crystal structures. Full Article text
gen Structure of the outer membrane porin OmpW from the pervasive pathogen Klebsiella pneumoniae By journals.iucr.org Published On :: 2024-01-01 Conjugation is the process by which plasmids, including those that carry antibiotic-resistance genes, are mobilized from one bacterium (the donor) to another (the recipient). The conjugation efficiency of IncF-like plasmids relies on the formation of mating-pair stabilization via intimate interactions between outer membrane proteins on the donor (a plasmid-encoded TraN isoform) and recipient bacteria. Conjugation of the R100-1 plasmid into Escherichia coli and Klebsiella pneumoniae (KP) recipients relies on pairing between the plasmid-encoded TraNα in the donor and OmpW in the recipient. Here, the crystal structure of K. pneumoniae OmpW (OmpWKP) is reported at 3.2 Å resolution. OmpWKP forms an eight-stranded β-barrel flanked by extracellular loops. The structures of E. coli OmpW (OmpWEC) and OmpWKP show high conservation despite sequence variability in the extracellular loops. Full Article text
gen Structural and biochemical characterization of the M405S variant of Desulfovibrio vulgaris formate dehydrogenase By journals.iucr.org Published On :: 2024-05-01 Molybdenum- or tungsten-dependent formate dehydrogenases have emerged as significant catalysts for the chemical reduction of CO2 to formate, with biotechnological applications envisaged in climate-change mitigation. The role of Met405 in the active site of Desulfovibrio vulgaris formate dehydrogenase AB (DvFdhAB) has remained elusive. However, its proximity to the metal site and the conformational change that it undergoes between the resting and active forms suggests a functional role. In this work, the M405S variant was engineered, which allowed the active-site geometry in the absence of methionine Sδ interactions with the metal site to be revealed and the role of Met405 in catalysis to be probed. This variant displayed reduced activity in both formate oxidation and CO2 reduction, together with an increased sensitivity to oxygen inactivation. Full Article text
gen Glucose-6-phosphate dehydrogenase and its 3D structures from crystallography and electron cryo-microscopy By journals.iucr.org Published On :: 2024-09-11 Glucose-6-phosphate dehydrogenase (G6PD) is the first enzyme in the pentose phosphate pathway. It has been extensively studied by biochemical and structural techniques. 13 X-ray crystal structures and five electron cryo-microscopy structures in the PDB are focused on in this topical review. Two F420-dependent glucose-6-phosphate dehydrogenase (FGD) structures are also reported. The significant differences between human and parasite G6PDs can be exploited to find selective drugs against infections such as malaria and leishmaniasis. Furthermore, G6PD is a prognostic marker in several cancer types and is also considered to be a tumour target. On the other hand, FGD is considered to be a target against Mycobacterium tuberculosis and possesses a high biotechnological potential in biocatalysis and bioremediation. Full Article text
gen X-ray crystal structure of proliferating cell nuclear antigen 1 from Aeropyrum pernix By journals.iucr.org Published On :: 2024-10-09 Proliferating cell nuclear antigen (PCNA) plays a critical role in DNA replication by enhancing the activity of various proteins involved in replication. In this study, the crystal structure of ApePCNA1, one of three PCNAs from the thermophilic archaeon Aeropyrum pernix, was elucidated. ApePCNA1 was cloned and expressed in Escherichia coli and the protein was purified and crystallized. The resulting crystal structure determined at 2.00 Å resolution revealed that ApePCNA1 does not form a trimeric ring, unlike PCNAs from other domains of life. It has unique structural features, including a long interdomain-connecting loop and a PIP-box-like sequence at the N-terminus, indicating potential interactions with other proteins. These findings provide insights into the functional mechanisms of PCNAs in archaea and their evolutionary conservation across different domains of life. A modified medium and protocol were used to express recombinant protein containing the lac operon. The expression of the target protein increased and the total incubation time decreased when using this system compared with those of previous expression protocols. Full Article text
gen Specific radiation damage to halogenated inhibitors and ligands in protein–ligand crystal structures By journals.iucr.org Published On :: This article reports an investigation into the effects of specific radiation damage to halogenated ligands in crystal structures of protein-inhibitor complexes. Full Article text
gen Crystal structure, Hirshfeld surface, DFT and molecular docking studies of 2-{4-[(E)-(4-acetylphenyl)diazenyl]phenyl}-1-(5-bromothiophen-2-yl)ethanone; a bromine⋯oxygen type contact By journals.iucr.org Published On :: The title compound is a non-liquid crystal molecule. The molecular crystal is consolidated by C—Br⋯O&z-dbnd;C type contacts running continuously along the [001] direction. Full Article text
gen Symmetries and symmetry-generated averages of elastic constants up to the sixth order of nonlinearity for all crystal classes, isotropy and transverse isotropy By journals.iucr.org Published On :: 2024-10-15 Algebraic expressions for averaging linear and nonlinear stiffness tensors from general anisotropy to different effective symmetries (11 Laue classes elastically representing all 32 crystal classes, and two non-crystalline symmetries: isotropic and cylindrical) have been derived by automatic symbolic computations of the arithmetic mean over the set of rotational transforms determining a given symmetry. This approach generalizes the Voigt average to nonlinear constants and desired approximate symmetries other than isotropic, which can be useful for a description of textured polycrystals and rocks preserving some symmetry aspects. Low-symmetry averages have been used to derive averages of higher symmetry to speed up computations. Relationships between the elastic constants of each symmetry have been deduced from their corresponding averages by resolving the rank-deficient system of linear equations. Isotropy has also been considered in terms of generalized Lamé constants. The results are published in the form of appendices in the supporting information for this article and have been deposited in the Mendeley database. Full Article text
gen Protocol using similarity score and improved shrink-wrap algorithm for better convergence of phase-retrieval calculation in X-ray diffraction imaging By journals.iucr.org Published On :: 2024-01-01 In X-ray diffraction imaging (XDI), electron density maps of a targeted particle are reconstructed computationally from the diffraction pattern alone using phase-retrieval (PR) algorithms. However, the PR calculations sometimes fail to yield realistic electron density maps that approximate the structure of the particle. This occurs due to the absence of structure amplitudes at and near the zero-scattering angle and the presence of Poisson noise in weak diffraction patterns. Consequently, the PR calculation becomes a bottleneck for XDI structure analyses. Here, a protocol to efficiently yield realistic maps is proposed. The protocol is based on the empirical observation that realistic maps tend to yield low similarity scores, as suggested in our prior study [Sekiguchi et al. (2017), J. Synchrotron Rad. 24, 1024–1038]. Among independently and concurrently executed PR calculations, the protocol modifies all maps using the electron-density maps exhibiting low similarity scores. This approach, along with a new protocol for estimating particle shape, improved the probability of obtaining realistic maps for diffraction patterns from various aggregates of colloidal gold particles, as compared with PR calculations performed without the protocol. Consequently, the protocol has the potential to reduce computational costs in PR calculations and enable efficient XDI structure analysis of non-crystalline particles using synchrotron X-rays and X-ray free-electron laser pulses. Full Article text
gen A thermal deformation optimization method for cryogenically cooled silicon crystal monochromators under high heat load By journals.iucr.org Published On :: 2024-01-22 A method to optimize the thermal deformation of an indirectly cryo-cooled silicon crystal monochromator exposed to intense X-rays at a low-emittance diffraction-limited synchrotron radiation source is presented. The thermal-induced slope error of the monochromator crystal has been studied as a function of heat transfer efficiency, crystal temperature distribution and beam footprint size. A partial cooling method is proposed, which flattens the crystal surface profile within the beam footprint by modifying the cooling contact area to optimize the crystal peak temperature. The optimal temperature varies with different photon energies, which is investigated, and a proper cooling strategy is obtained to fulfil the thermal distortion requirements over the entire photon energy range. At an absorbed power up to 300 W with a maximum power density of 44.8 W mm−2 normal incidence beam from an in-vacuum undulator, the crystal thermal distortion does not exceed 0.3 µrad at 8.33 keV. This method will provide references for the monochromator design on diffraction-limited synchrotron radiation or free-electron laser light sources. Full Article text
gen Ultrashort large-bandwidth X-ray free-electron laser generation with a dielectric-lined waveguide By journals.iucr.org Published On :: 2024-02-09 Large-bandwidth pulses produced by cutting-edge X-ray free-electron lasers (FELs) are of great importance in research fields like material science and biology. In this paper, a new method to generate high-power ultrashort FEL pulses with tunable spectral bandwidth with spectral coherence using a dielectric-lined waveguide without interfering operation of linacs is proposed. By exploiting the passive and dephasingless wakefield at terahertz frequency excited by the beam, stable energy modulation can be achieved in the electron beam and large-bandwidth high-intensity soft X-ray radiation can be generated. Three-dimensional start-to-end simulations have been carried out and the results show that coherent radiation pulses with duration of a few femtoseconds and bandwidths ranging from 1.01% to 2.16% can be achieved by changing the undulator taper profile. Full Article text
gen Optimization of synchrotron radiation parameters using swarm intelligence and evolutionary algorithms By journals.iucr.org Published On :: 2024-02-22 Alignment of each optical element at a synchrotron beamline takes days, even weeks, for each experiment costing valuable beam time. Evolutionary algorithms (EAs), efficient heuristic search methods based on Darwinian evolution, can be utilized for multi-objective optimization problems in different application areas. In this study, the flux and spot size of a synchrotron beam are optimized for two different experimental setups including optical elements such as lenses and mirrors. Calculations were carried out with the X-ray Tracer beamline simulator using swarm intelligence (SI) algorithms and for comparison the same setups were optimized with EAs. The EAs and SI algorithms used in this study for two different experimental setups are the Genetic Algorithm (GA), Non-dominated Sorting Genetic Algorithm II (NSGA-II), Particle Swarm Optimization (PSO) and Artificial Bee Colony (ABC). While one of the algorithms optimizes the lens position, the other focuses on optimizing the focal distances of Kirkpatrick–Baez mirrors. First, mono-objective evolutionary algorithms were used and the spot size or flux values checked separately. After comparison of mono-objective algorithms, the multi-objective evolutionary algorithm NSGA-II was run for both objectives – minimum spot size and maximum flux. Every algorithm configuration was run several times for Monte Carlo simulations since these processes generate random solutions and the simulator also produces solutions that are stochastic. The results show that the PSO algorithm gives the best values over all setups. Full Article text
gen High-pressure X-ray photon correlation spectroscopy at fourth-generation synchrotron sources By journals.iucr.org Published On :: 2024-04-10 A new experimental setup combining X-ray photon correlation spectroscopy (XPCS) in the hard X-ray regime and a high-pressure sample environment has been developed to monitor the pressure dependence of the internal motion of complex systems down to the atomic scale in the multi-gigapascal range, from room temperature to 600 K. The high flux of coherent high-energy X-rays at fourth-generation synchrotron sources solves the problems caused by the absorption of diamond anvil cells used to generate high pressure, enabling the measurement of the intermediate scattering function over six orders of magnitude in time, from 10−3 s to 103 s. The constraints posed by the high-pressure generation such as the preservation of X-ray coherence, as well as the sample, pressure and temperature stability, are discussed, and the feasibility of high-pressure XPCS is demonstrated through results obtained on metallic glasses. Full Article text
gen Modelling the power threshold and optimum thermal deformation of indirectly liquid-nitrogen cryo-cooled Si monochromators By journals.iucr.org Published On :: 2024-04-09 Maximizing the performance of crystal monochromators is a key aspect in the design of beamline optics for diffraction-limited synchrotron sources. Temperature and deformation of cryo-cooled crystals, illuminated by high-power beams of X-rays, can be estimated with a purely analytical model. The analysis is based on the thermal properties of cryo-cooled silicon crystals and the cooling geometry. Deformation amplitudes can be obtained, quickly and reliably. In this article the concept of threshold power conditions is introduced and defined analytically. The contribution of parameters such as liquid-nitrogen cooling efficiency, thermal contact conductance and interface contact area of the crystal with the cooling base is evaluated. The optimal crystal illumination and the base temperature are inferred, which help minimize the optics deformation. The model has been examined using finite-element analysis studies performed for several beamlines of the Diamond-II upgrade. Full Article text
gen Synchrotron infrared nanospectroscopy in fourth-generation storage rings By journals.iucr.org Published On :: 2024-04-17 Fourth-generation synchrotron storage rings represent a significant milestone in synchrotron technology, offering outstandingly bright and tightly focused X-ray beams for a wide range of scientific applications. However, due to their inherently tight magnetic lattices, these storage rings have posed critical challenges for accessing lower-energy radiation, such as infrared (IR) and THz. Here the first-ever IR beamline to be installed and to operate at a fourth-generation synchrotron storage ring is introduced. This work encompasses several notable advancements, including a thorough examination of the new IR source at Sirius, a detailed description of the radiation extraction scheme, and the successful validation of our optical concept through both measurements and simulations. This optimal optical setup has enabled us to achieve an exceptionally wide frequency range for our nanospectroscopy experiments. Through the utilization of synchrotron IR nanospectroscopy on biological and hard matter samples, the practicality and effectiveness of this beamline has been successfully demonstrated. The advantages of fourth-generation synchrotron IR sources, which can now operate with unparalleled stability as a result of the stringent requirements for producing low-emittance X-rays, are emphasized. Full Article text