sen Trump win ignites crypto frenzy that sends bitcoin to a record high By www.mprnews.org Published On :: Wed, 06 Nov 2024 17:19:38 +0000 The price of bitcoin has hit a new high as investors bet that Donald Trump’s victory in the U.S. presidential election will be a boon for cryptocurrencies. Full Article
sen Republicans maintain control of the US House of Representatives By www.christianpost.com Published On :: Mon, 11 Nov 2024 21:15:24 -0500 The Republican Party has secured a majority of the seats in the United States House of Representatives, having already secured the White House and the U.S. Senate. Full Article
sen Failure by immune cells worsens Alzheimer's disease By english.pravda.ru Published On :: Tue, 02 Feb 2016 01:33:00 +0300 University of Coimbra Failure by immune cells worsens Alzheimer's disease, reveals study by the University of Coimbra A team from the Center for Neuroscience and Cell Biology (CNC), University of Coimbra (UC) in Portugal discovered how some cells of the immune system lose the ability to fight Alzheimer's disease. This new knowledge can help to find a definitive diagnosis. Ana Luísa Cardoso, the coordinator of the research group, explains that "We found that monocytes (the innate immune system cells) of Alzheimer's patients are unable to move when stimulated by substances produced in the brain, which may lead to reduction of cells that can be recruited to the nervous tissue and participate in fighting the disease." Full Article Health
sen Serial killer who cannibalised minors and killed over 30 sent to mental hospital By english.pravda.ru Published On :: Tue, 21 May 2024 16:41:00 +0300 The Kemerovo regional court ruled to send Alexander Spesivtsev, a resident of Novokuznetsk, to compulsory treatment, the regional Office of the Public Prosecutor said. The defendant, Alexander Spesivtsev, is a serial killer, who killed at least 34 victims and ate them during the 1990s. Spesivtsev will undergo treatment at a special psychiatric hospital. Full Article Society
sen Chechen President Kadyrov pledges to send more airplanes with volunteers to Ukraine By english.pravda.ru Published On :: Tue, 29 Oct 2024 20:30:00 +0300 Chechnya should send volunteers to the zone of the special military operation in Ukraine more frequently, Chechen President Ramzan Kadyrov said. Kadyrov made this announcement after a Ukrainian drone struck the building of the University of Special Forces in Gudermes. "I urge real men to volunteer to fight to defend our land, our state and our people. We need to show that you can't play around with Chechnya and its people," Ramzan Kadyrov said. Airplanes with volunteers should be sent to the front lines every day, not just once a week, as is happening now, he added. Full Article World
sen Former NFL player sentenced for making over $33,000 in false medical claims By www.tdi.texas.gov Published On :: Wed, 26 Apr 2023 00:00:00 CDT Former NFL player James Adkisson pleaded guilty to submitting more than $33,000 in fraudulent health reimbursement claims after an investigation by the Texas Department of Insurance (TDI) Fraud Unit. Full Article
sen Exjugador de la NFL sentenciado por reclamaciones médicas fraudulentas de más de $33,000 By www.tdi.texas.gov Published On :: Wed, 26 Apr 2023 00:00:00 CDT James Adkisson, el exjugador de la NFL se declaró culpable por presentar reclamaciones fraudulentas de más de $33,000 para reembolso de salud después de una investigación realizada por la Unidad de Fraude del Departamento de Seguros de Texas (Texas Department of Insurance, TDI, por su nombre y siglas en inglés). Full Article
sen Wife of former San Antonio trucking magnate sentenced in multi-million-dollar fraud scheme By www.tdi.texas.gov Published On :: Tue, 16 Jul 2024 00:00:00 CDT Frances Hall, former co-owner of Bill Hall Jr. Trucking, has been sentenced for her role in a scheme to avoid $9 million in workers’ compensation premiums. Full Article
sen US pilots admired Soviet counterparts for their sense of humour By english.pravda.ru Published On :: Mon, 15 Nov 2021 16:27:00 +0300 US pilots told a story about Soviet pilots of MiG aircraft that took off to intercept enemy aircraft at the height of the Cold War. Soviet pilots were making jokes during the operations, Theaviationgeekclub website wrote with reference to a collection of stories dedicated to the Douglas F3D Skyknight air missions. "The first time we were intercepted, they reported that we were taking pictures of them, as we were carrying 35 mm hand-held cameras. Normally, it would be on the pilot's side where the interceptors were, and the ECMO would lean across and snap some pictures of them. And the Russians would report, "They're taking pictures of us. What should we do?” One of the Russian controllers had a sense of humour and said "Smile”. Who would have thought the Russians had any sense of humour at all?" Skyknight pilot Chuck Houseman said. The book also said that US pilots, who were collecting reconnaissance data near the Soviet borders in the Far East, thought of Soviet pilots as friendly individuals compared to pilots from other communist countries. According to the author of the book and aviation expert Joe Copalman, the midair encounters had always been quiet as the United States had not violated state borders and performed its tasks within international space. Full Article History traditions
sen More surprises: Japan and Senegal, Russia through By english.pravda.ru Published On :: Wed, 20 Jun 2018 00:16:00 +0300 More surprises: Japan and Senegal Japan beat Colombia 2-1, the same result as the Senegal versus Poland game Full Article Sport
sen Boston Dynamics presents humanoid robot of new generation By english.pravda.ru Published On :: Thu, 18 Apr 2024 13:03:00 +0300 Boston Dynamics presented the new robot. The company refused from the old hydraulic platform to introduce the new electric one under the same name, Atlas. The new robot is completely electronic, there are no hydraulic systems involved. The new robot will be stronger and more maneuverable as all developments of the previous generation of the robot will be improved. The company is ambitious to introduce humanoid robots and create infrastructure for them, including software. Full Article Science
sen China sends three taikonauts on board Shenzhou-19 spacecraft into orbit By english.pravda.ru Published On :: Wed, 30 Oct 2024 14:07:00 +0300 Chinese manned spacecraft Shenzhou-19 with three taikonauts on board was successfully launched into low-Earth orbit from the Jiuquan Satellite Launch Center in northwestern China, UDN Global reports. The spacecraft blasted off on October 29 at 23:27 Moscow time, or October 30 at 04:27 local time. A Long March 2 °F-19 launch vehicle was used for the liftoff. About ten minutes into the flight, the Shenzhou-19 manned spacecraft successfully separated from the rocket and flew into orbit. There are three crew members on board the Shenzhou-19. They will conduct 86 scientific experiments in space, including experiments in the field of medicine, biology, fundamental physics of microgravity, materials science and space technology, the agency notes. Full Article Science
sen Putin: US building up military presence near Russian borders By english.pravda.ru Published On :: Tue, 10 Sep 2024 16:55:00 +0300 The United States is building up its armed forces along all of Russia's borders, including on Ukraine and the Asia-Pacific region, Russian President Vladimir Putin said during his speech at the Ocean-2024 command and staff exercises, TASS reports. "Under the pretext of countering the allegedly existing Russian threat and containing the People's Republic of China, the United States and its satellites are building up their military presence near Russia's western borders — in the Arctic and in the Asia-Pacific region," Putin said. The USA is thus provoking a new arms race, the Russian president said. According to him, Washington's strategy is preventing the conflict in Ukraine from ending. Full Article Russia
sen Russia's largest bank sends huge package of documents to China for its first branch By english.pravda.ru Published On :: Mon, 26 Dec 2022 17:58:00 +0300 Sberbank — Russia's largest state-owned bank — has the only foreign branch in India. In early November it was reported that Sberbank was going to open a branch in China. According to Alexander Vedyakhin, deputy chairman of the board, all the necessary documents have been sent to China, RBC reports. "We have been communicating with the People's Bank of China a lot lately. We have sent a massive package of documents there, as the Chinese regulator is very meticulous about documents. I hope that by the end of 2023 we will be able to open a branch in China. It usually takes 1.5-2 years, but we hope that by the end of 2023 we will already have a branch in this country,” Alexander Vedyakhin said. Sberbank opened a representative office in China in 2010; A representative office of Sberbank appeared in Germany in 2009; Sberbank has only one branch abroad — in New Delhi, India. After the start of the Russian special operation in Ukraine, Sberbank came under sanctions from Western states: the United States and Great Britain froze the bank's assets and banned citizens from doing business with it, whereas the EU disconnected Sberbank from the SWIFT interbank data exchange system. Full Article Business
sen Austria's Raiffeisen Bank finds itself in unprecedented situation in Russia By english.pravda.ru Published On :: Thu, 30 Mar 2023 15:11:00 +0300 Austria's Raiffeisen Bank International considers selling the Russian division or withdrawing it from the structure of the group. Raiffeisen's "daughter" will continue running "certain banking activities" in Russia to maintain license. At the moment, the bank can not get rid of all of its business in Russia, but is striving for this to happen, RBI CEO Johann Strobl said. The RBI Group in Russia is represented by Raiffeisenbank, as well as leasing, insurance and management companies. The company's subdivisions employ over 9,000 people. Full Article Business
sen BIXOLON presents the latest in its dedicated labelling range at LogiMAT 2023 By www.retailtechnologyreview.com Published On :: BIXOLON Europe GmbH, a subsidiary of BIXOLON, the global manufacturer of advanced receipt, label and mobile printers, welcomes visitors on stand 4/F80 at LogiMAT 2023 from the 25-27.04.2023, where it will be showcasing its advanced range of printing solutions for the intralogistics market. Full Article Exhibitions and Events Print and Label
sen Russian soldiers sentenced for life for killing family of nine in Donetsk People's Republic By english.pravda.ru Published On :: Fri, 08 Nov 2024 19:08:00 +0300 Two Russian servicemen were sentenced for life for the mass murder of civilians in the town of Volnovakha in the Donetsk People's Republic. On October 28, 2023, contract soldiers Stanislav Rau and Anton Sopov shot the Kapkanets family of nine people, including two children. Two days later, law enforcement officers detained the suspects. The men were found guilty of illegally entering a home and murdering two or more people, including minors, in a generally dangerous manner. The servicemen were sentenced to life terms. Full Article Incidents
sen Paysend launches instant cross-border payouts to China UnionPay cards By www.retailtechnologyreview.com Published On :: Paysend has launched instant and simple cross-border payouts to China UnionPay cards for its Enterprise customers. Full Article Data Capture Retail Supply Chain
sen Precision Retail launches rewards-based survey plugin to capture consent-based consumer data By www.retailtechnologyreview.com Published On :: The Golden Quarter of retail is approaching. Perfect time for retailers to gather mounds of consumer data. But how to do so compliantly? Two Toronto-based marketing specialists have an answer: Precision Retail, a new venture offering what they believe to be the world's first and only rewards-based post-purchase survey plugin to capture 0PD. Full Article Data Capture Retail Supply Chain
sen Paysend launches ‘Paysend Libre’ in Mexico powered by Mastercard By www.retailtechnologyreview.com Published On :: Fri, 13 Nov 8240 17:28:37 +0000 Paysend and Mastercard have partnered to launch Paysend Libre in Mexico in a move to drive financial inclusion in a region where the majority of the population is still underbanked or unbanked. Full Article Data Capture
sen Catina Latham, PhD, named UChicago Medicine's new Senior Vice President for Community Health Transformation and Chief Equity Officer By www.newswise.com Published On :: Tue, 12 Nov 2024 11:50:55 EST Catina Latham, PhD, will succeed Brenda Battle as UChicago Medicine's Senior Vice President for Community Health Transformation and Chief Equity Officer Full Article
sen "Emotional Contagion" a Factor in Senior's Mental Health By www.newswise.com Published On :: Tue, 12 Nov 2024 12:00:35 EST A new study finds that seniors who tend to mirror other people's feelings are more likely to show signs of being anxious or depressed themselves. Full Article
sen Smidt Heart Institute Experts Will Give Key Presentations at AHA Scientific Sessions 2024 By www.newswise.com Published On :: Tue, 12 Nov 2024 15:40:10 EST Physicians and investigators from the Smidt Heart Institute at Cedars-Sinai will give more than 30 presentations at the American Heart Association (AHA) Scientific Sessions Nov. 16-18 in Chicago. Full Article
sen Study: Student Absenteeism Crisis May Be Hurting Teacher Job Satisfaction By www.newswise.com Published On :: Tue, 12 Nov 2024 09:30:00 EST As student absenteeism reaches record highs in schools across the United States, new research finds that student absences are linked to lower teacher job satisfaction, raising concerns that this may exacerbate growing teacher shortages. Full Article
sen "Emotional Contagion" a Factor in Senior's Mental Health By www.newswise.com Published On :: Tue, 12 Nov 2024 12:00:35 EST A new study finds that seniors who tend to mirror other people's feelings are more likely to show signs of being anxious or depressed themselves. Full Article
sen Smidt Heart Institute Experts Will Give Key Presentations at AHA Scientific Sessions 2024 By www.newswise.com Published On :: Tue, 12 Nov 2024 15:40:10 EST Physicians and investigators from the Smidt Heart Institute at Cedars-Sinai will give more than 30 presentations at the American Heart Association (AHA) Scientific Sessions Nov. 16-18 in Chicago. Full Article
sen Medical Students to be Allowed to Take Leave of Absence for Personal Reasons By world.kbs.co.kr Published On :: Tue, 29 Oct 2024 17:40:17 +0900 [Domestic] : Medical students will be allowed to take a leave of absence as long as the request is for personal reasons. The education ministry revealed the decision on Tuesday after holding a closed-door meeting with the presidents of 40 universities that have medical schools. Previously, medical students were ...[more...] Full Article Domestic
sen Defense Chief: Sending Observation Team Does Not Constitute Overseas Deployment By world.kbs.co.kr Published On :: Mon, 11 Nov 2024 15:28:36 +0900 [Politics] : Defense Minister Kim Yong-hyun on Monday reiterated that sending an observation team to Ukraine is necessary for protecting national interest. During a National Assembly National Defense Committee session, Minister Kim said sending an observation team differs from troop deployment. He explained that a ...[more...] Full Article Politics
sen US: N. Korea Sent 10,000 Troops to Russia By world.kbs.co.kr Published On :: Tue, 29 Oct 2024 10:12:16 +0900 [Inter-Korea] : The U.S. Department of Defense said North Korea has sent around ten-thousand troops to Russia and some of them have already moved closer to Ukraine. Pentagon spokesperson Sabrina Singh told reporters on Monday that Washington believes the North has sent about ten-thousand troops to eastern Russia for ...[more...] Full Article Inter-Korea
sen Defense Chief: S. Korea Won’t Send Troops to Support Ukraine By world.kbs.co.kr Published On :: Thu, 31 Oct 2024 10:20:08 +0900 [Inter-Korea] : Defense minister Kim Yong-hyun said Wednesday that South Korea is not considering sending troops to support Ukraine. The minister made the remarks during a meeting with reporters in Washington, while visiting the United States to attend the annual Security Consultative Meeting. When asked how the ...[more...] Full Article Inter-Korea
sen S. Korean Military: Over 10,000 N. Korean Troops in Russia, ‘Considerable Number’ Sent to Front Lines near Ukraine By world.kbs.co.kr Published On :: Tue, 05 Nov 2024 13:02:37 +0900 [Inter-Korea] : The South Korean military says it believes more than ten-thousand North Korean troops have been deployed to Russia in support of the military offensive in Ukraine. At a press briefing Tuesday, defense ministry spokesperson Jeon Ha-kyu said intelligence authorities in South Korea and the U.S. believe a ...[more...] Full Article Inter-Korea
sen Prosecutors Seek Four-Year Sentence for Footballer Who Admitted Secretly Filming Sex Acts By world.kbs.co.kr Published On :: Wed, 16 Oct 2024 13:47:54 +0900 [Sports] : Prosecutors are seeking a four-year prison term for football forward Hwang Ui-jo, who has admitted to filming sexual encounters without his partners’ consent. The 32-year-old footballer, who plays for the Turkish Süper Lig club Alanyaspor, entered the guilty plea Wednesday at the Seoul Central District ...[more...] Full Article Sports
sen 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
sen Andy Kim Wins in New Jersey, Becoming First Korean American Senator By world.kbs.co.kr Published On :: Wed, 06 Nov 2024 11:12:11 +0900 [International] : Democratic Rep. Andy Kim was elected to the U.S. Senate on Tuesday, becoming the first Korean American to serve in the Senate. With elections for the Senate and the House of Representatives taking place the same day as the U.S. presidential election, Kim defeated Curtis Bashaw in the New Jersey senatorial ...[more...] Full Article International
sen Archangel Gabriel: Messenger and Angel of the Annunciation By people.howstuffworks.com Published On :: Tue, 12 Nov 2024 10:30:04 -0500 Archangel Gabriel is one of the most revered and influential figures in religious traditions across the world, often seen as a messenger of divine will and a guide to those seeking spiritual clarity. Full Article
sen 3 Essential Steps for Mobile Privacy With Startpage By computer.howstuffworks.com Published On :: Tue, 16 Jul 2024 11:44:33 -0400 In today's digital age, safeguarding your mobile privacy is vital. Here are three easy steps, powered by Startpage, to keep your digital life secure. Full Article
sen What Does the 7th House Represent in Astrology? By entertainment.howstuffworks.com Published On :: Fri, 08 Nov 2024 05:00:03 -0500 Discover how the 7th House in astrology shapes love, partnerships, and marriage dynamics, revealing deep insights into relationship compatibility and commitment. Full Article
sen Minister Meets with Auto, Battery Industry Representatives ahead of Trump’s Second Term By world.kbs.co.kr Published On :: Wed, 13 Nov 2024 16:54:38 +0900 [Economy] : The minister of trade, industry and energy has met with automotive and battery industry representatives ahead of Donald Trump’s return to power in the U.S. The ministry announced on Wednesday that the meeting took place earlier in the day, with participants highlighting the importance of South Korean ...[more...] Full Article Economy
sen Senior Management Board - British Geological Survey By news.google.com Published On :: Thu, 24 Sep 2020 01:16:54 GMT Senior Management Board British Geological Survey Full Article
sen Visit by Indonesian Embassy representatives to BGS - British Geological Survey By news.google.com Published On :: Tue, 27 Aug 2024 07:00:00 GMT Visit by Indonesian Embassy representatives to BGS British Geological Survey Full Article
sen Analytical models representing X-ray form factors of ions By journals.iucr.org Published On :: 2024-01-01 Parameters in analytical models for X-ray form factors of ions f0(s), based on the inverse Mott–Bethe formula involving a variable number of Gaussians, are determined for a wide range of published data sets {s, f0(s)}. The models reproduce the calculated form-factor values close to what is expected from a uniform statistical distribution with limits determined by their precision. For different ions associated with the same atom, the number of Gaussians in the models decreases with increasing net positive charge. Full Article text
sen N-representable one-electron reduced density matrix reconstruction with frozen core electrons By journals.iucr.org Published On :: 2024-03-21 Recent advances in quantum crystallography have shown that, beyond conventional charge density refinement, a one-electron reduced density matrix (1-RDM) satisfying N-representability conditions can be reconstructed using jointly experimental X-ray structure factors and directional Compton profiles (DCP) through semidefinite programming. So far, such reconstruction methods for 1-RDM, not constrained to idempotency, have been tested only on a toy model system (CO2). In this work, a new method is assessed on crystalline urea [CO(NH2)2] using static (0 K) and dynamic (50 K) artificial experimental data. An improved model, including symmetry constraints and frozen core-electron contribution, is introduced to better handle the increasing system complexity. Reconstructed 1-RDMs, deformation densities and DCP anisotropy are analysed, and it is demonstrated that the changes in the model significantly improve the reconstruction quality, even when there is insufficient information and data corruption. The robustness of the model and the strategy are thus shown to be well adapted to address the reconstruction problem from actual experimental scattering data. Full Article text
sen Expression, purification and crystallization of the photosensory module of phytochrome B (phyB) from Sorghum bicolor By journals.iucr.org Published On :: 2024-02-20 Sorghum, a short-day tropical plant, has been adapted for temperate grain production, in particular through the selection of variants at the MATURITY loci (Ma1–Ma6) that reduce photoperiod sensitivity. Ma3 encodes phytochrome B (phyB), a red/far-red photochromic biliprotein photoreceptor. The multi-domain gene product, comprising 1178 amino acids, autocatalytically binds the phytochromobilin chromophore to form the photoactive holophytochrome (Sb.phyB). This study describes the development of an efficient heterologous overproduction system which allows the production of large quantities of various holoprotein constructs, along with purification and crystallization procedures. Crystals of the Pr (red-light-absorbing) forms of NPGP, PGP and PG (residues 1–655, 114–655 and 114–458, respectively), each C-terminally tagged with His6, were successfully produced. While NPGP crystals did not diffract, those of PGP and PG diffracted to 6 and 2.1 Å resolution, respectively. Moving the tag to the N-terminus and replacing phytochromobilin with phycocyanobilin as the ligand produced PG crystals that diffracted to 1.8 Å resolution. These results demonstrate that the diffraction quality of challenging protein crystals can be improved by removing flexible regions, shifting fusion tags and altering small-molecule ligands. Full Article text
sen Grazing-incidence synchrotron radiation diffraction studies on irradiated Ce-doped and pristine Y-stabilized ZrO2 at the Rossendorf beamline By journals.iucr.org Published On :: 2024-02-16 In this work, Ce-doped yttria-stabilized zirconia (YSZ) and pure YSZ phases were subjected to irradiation with 14 MeV Au ions. Irradiation studies were performed to simulate long-term structural and microstructural damage due to self-irradiation in YSZ phases hosting alpha-active radioactive species. It was found that both the Ce-doped YSZ and the YSZ phases had a reasonable tolerance to irradiation at high ion fluences and the bulk crystallinity was well preserved. Nevertheless, local microstrain increased in all compounds under study after irradiation, with the Ce-doped phases being less affected than pure YSZ. Doping with cerium ions increased the microstructural stability of YSZ phases through a possible reduction in the mobility of oxygen atoms, which limits the formation of structural defects. Doping of YSZ with tetravalent actinide elements is expected to have a similar effect. Thus, YSZ phases are promising for the safe long-term storage of radioactive elements. Using synchrotron radiation diffraction, measurements of the thin irradiated layers of the Ce-YSZ and YSZ samples were performed in grazing incidence (GI) mode. A corresponding module for measurements in GI mode was developed at the Rossendorf Beamline and relevant technical details for sample alignment and data collection are also presented. Full Article text
sen Improving sensitivity of XANES structural fit to the bridged metal–metal coordination By journals.iucr.org Published On :: 2024-03-26 Hard X-ray absorption spectroscopy is a valuable in situ probe for non-destructive diagnostics of metal sites. The low-energy interval of a spectrum (XANES) contains information about the metal oxidation state, ligand type, symmetry and distances in the first coordination shell but shows almost no dependency on the bridged metal–metal bond length. The higher-energy interval (EXAFS), on the contrary, is more sensitive to the coordination numbers and can decouple the contribution from distances in different coordination shells. Supervised machine-learning methods can combine information from different intervals of a spectrum; however, computational approaches for the near-edge region of the spectrum and higher energies are different. This work aims to keep all benefits of XANES and extend its sensitivity towards the interatomic distances in the first and second coordination shells. Using a binuclear bridged copper complex as a case study and cross-validation analysis as a quantitative tool it is shown that the first 170 eV above the edge are already sufficient to balance the contributions of Cu–O/N scattering and Cu–Cu scattering. As a more general outcome this work highlights the trivial but often overlooked importance of using `longer' energy intervals of XANES for structural refinement and machine-learning predictions. The first 200 eV above the absorption edge still do not require parametrization of Debye–Waller damping and can be calculated within full multiple scattering or finite difference approximations with only moderately increased computational costs. Full Article text
sen Soft X-ray wavefront sensing at an ellipsoidal mirror shell By journals.iucr.org Published On :: 2024-06-06 A reliable `in situ' method for wavefront sensing in the soft X-ray domain is reported, developed for the characterization of rotationally symmetric optical elements, like an ellipsoidal mirror shell. In a laboratory setup, the mirror sample is irradiated by an electron-excited (4.4 keV), micrometre-sized (∼2 µm) fluorescence source (carbon Kα, 277 eV). Substantially, the three-dimensional intensity distribution I(r) is recorded by a CCD camera (2048 × 512 pixels of 13.5 µm) at two positions along the optical axis, symmetrically displaced by ±21–25% from the focus. The transport-of-intensity equation is interpreted in a geometrical sense from plane to plane and implemented as a ray tracing code, to retrieve the phase Φ(r) from the radial intensity gradient on a sub-pixel scale. For reasons of statistical reliability, five intra-/extra-focal CCD image pairs are evaluated and averaged to an annular two-dimensional map of the wavefront error {cal W}. In units of the test wavelength (C Kα), an r.m.s. value sigma_{cal{W}} = ±10.9λ0 and a peak-to-valley amplitude of ±31.3λ0 are obtained. By means of the wavefront, the focus is first reconstructed with a result for its diameter of 38.4 µm, close to the direct experimental observation of 39.4 µm (FWHM). Secondly, figure and slope errors of the ellipsoid are characterized with an average of ±1.14 µm and ±8.8 arcsec (r.m.s.), respectively, the latter in reasonable agreement with the measured focal intensity distribution. The findings enable, amongst others, the precise alignment of axisymmetric X-ray mirrors or the design of a wavefront corrector for high-resolution X-ray science. Full Article text
sen High-angular-sensitivity X-ray phase-contrast microtomography of soft tissue through a two-directional beam-tracking synchrotron set-up By journals.iucr.org Published On :: 2024-07-15 Two-directional beam-tracking (2DBT) is a method for phase-contrast imaging and tomography that uses an intensity modulator to structure the X-ray beam into an array of independent circular beamlets that are resolved by a high-resolution detector. It features isotropic spatial resolution, provides two-dimensional phase sensitivity, and enables the three-dimensional reconstructions of the refractive index decrement, δ, and the attenuation coefficient, μ. In this work, the angular sensitivity and the spatial resolution of 2DBT images in a synchrotron-based implementation is reported. In its best configuration, angular sensitivities of ∼20 nrad and spatial resolution of at least 6.25 µm in phase-contrast images were obtained. Exemplar application to the three-dimensional imaging of soft tissue samples, including a mouse liver and a decellularized porcine dermis, is also demonstrated. Full Article text
sen Spexwavepy: an open-source Python package for X-ray wavefront sensing using speckle-based techniques By journals.iucr.org Published On :: 2024-07-30 In situ wavefront sensing plays a critical role in the delivery of high-quality beams for X-ray experiments. X-ray speckle-based techniques stand out among other in situ techniques for their easy experimental setup and various data acquisition modes. Although X-ray speckle-based techniques have been under development for more than a decade, there are still no user-friendly software packages for new researchers to begin with. Here, we present an open-source Python package, spexwavepy, for X-ray wavefront sensing using speckle-based techniques. This Python package covers a variety of X-ray speckle-based techniques, provides plenty of examples with real experimental data and offers detailed online documentation for users. We hope it can help new researchers learn and apply the speckle-based techniques for X-ray wavefront sensing to synchrotron radiation and X-ray free-electron laser beamlines. Full Article text
sen Diamond sensors for hard X-ray energy and position resolving measurements at the European XFEL By journals.iucr.org Published On :: 2024-07-30 The diagnostics of X-ray beam properties has a critical importance at the European X-ray Free-Electron Laser facility. Besides existing diagnostic components, utilization of a diamond sensor was proposed to achieve radiation-hard, non-invasive beam position and pulse energy measurements for hard X-rays. In particular, with very hard X-rays, diamond-based sensors become a useful complement to gas-based devices which lose sensitivity due to significantly reduced gas cross-sections. The measurements presented in this work were performed with diamond sensors consisting of an electronic-grade single-crystal chemical-vapor-deposition diamond with position-sensitive resistive electrodes in a duo-lateral configuration. The results show that the diamond sensor delivers pulse-resolved X-ray beam position data at 2.25 MHz with an uncertainty of less than 1% of the beam size. To our knowledge this is the first demonstration of pulse-resolved position measurements at the MHz rate using a transmissive diamond sensor at a free-electron laser facility. It can therefore be a valuable tool for X-ray free-electron lasers, especially for high-repetition-rate machines, enabling applications such as beam-based alignment and intra-pulse-train position feedback. Full Article text
sen New achievements in orbital angular momentum beam characterization using a Hartmann wavefront sensor and the Kirkpatrick–Baez active optical system KAOS By journals.iucr.org Published On :: 2024-08-16 Advances in physics have been significantly driven by state-of-the-art technology, and in photonics and X-ray science this calls for the ability to manipulate the characteristics of optical beams. Orbital angular momentum (OAM) beams hold substantial promise in various domains such as ultra-high-capacity optical communication, rotating body detection, optical tweezers, laser processing, super-resolution imaging etc. Hence, the advancement of OAM beam-generation technology and the enhancement of its technical proficiency and characterization capabilities are of paramount importance. These endeavours will not only facilitate the use of OAM beams in the aforementioned sectors but also extend the scope of applications in diverse fields related to OAM beams. At the FERMI Free-Electron Laser (Trieste, Italy), OAM beams are generated either by tailoring the emission process on the undulator side or, in most cases, by coupling a spiral zone plate (SZP) in tandem with the refocusing Kirkpatrick–Baez active optic system (KAOS). To provide a robust and reproducible workflow to users, a Hartmann wavefront sensor (WFS) is used for both optics tuning and beam characterization. KAOS is capable of delivering both tightly focused and broad spots, with independent control over vertical and horizontal magnification. This study explores a novel non-conventional `near collimation' operational mode aimed at generating beams with OAM that employs the use of a lithographically manufactured SZP to achieve this goal. The article evaluates the mirror's performance through Hartmann wavefront sensing, offers a discussion of data analysis methodologies, and provides a quantitative analysis of these results with ptychographic reconstructions. Full Article text