Understanding the structure–property relationship in electrocatalysts under working conditions is crucial for the rational design of novel and improved catalytic materials. This paper presents the Aarhus University reactor for electrochemical studies using X-rays (AUREX) operando electrocatalytic flow cell, designed as an easy-to-use versatile setup with a minimal background contribution and a uniform flow field to limit concentration polarization and handle gas formation. The cell has been employed to measure operando total scattering, diffraction and absorption spectroscopy as well as simultaneous combinations thereof on a commercial silver electrocatalyst for proof of concept. This combination of operando techniques allows for monitoring of the short-, medium- and long-range structure under working conditions, including an applied potential, liquid electrolyte and local reaction environment. The structural transformations of the Ag electrocatalyst are monitored with non-negative matrix factorization, linear combination analysis, the Pearson correlation coefficient matrix, and refinements in both real and reciprocal space. Upon application of an oxidative potential in an Ar-saturated aqueous 0.1 M KHCO3/K2CO3 electrolyte, the face-centered cubic (f.c.c.) Ag gradually transforms first to a trigonal Ag2CO3 phase, followed by the formation of a monoclinic Ag2CO3 phase. A reducing potential immediately reverts the structure to the Ag (f.c.c.) phase. Following the electrochemical-reaction-induced phase transitions is of fundamental interest and necessary for understanding and improving the stability of electrocatalysts, and the operando cell proves a versatile setup for probing this. In addition, it is demonstrated that, when studying electrochemical reactions, a high energy or short exposure time is needed to circumvent beam-induced effects.

A neutron time-of-flight (TOF) powder diffractometer with a continuous wide-angle array of detectors can be electronically focused to make a single pseudo-constant wavelength diffraction pattern, thus facilitating angle-dependent intensity corrections. The resulting powder diffraction peak profiles are affected by the neutron source emission profile and resemble the function currently used for TOF diffraction.

Using a 5 µm-diameter X-ray beam, we collected scanning X-ray microdiffraction in both the small-angle (SAXS) and the wide-angle (WAXS) regimes from thin sections of fixed human brain tissue from Alzheimer's subjects. The intensity of scattering in the SAXS regime of these patterns exhibits essentially no correlation with the observed intensity in the WAXS regime, indicating that the structures responsible for these two portions of the diffraction patterns, which reflect different length scales, are distinct. SAXS scattering exhibits a power-law behavior in which the log of intensity decreases linearly with the log of the scattering angle. The slope of the log–log curve is roughly proportional to the intensity in the SAXS regime and, surprisingly, inversely proportional to the intensity in the WAXS regime. We interpret these observations as being due to the presence of sub-micrometre-sized voids formed during dehydration of the fixed tissue. The SAXS intensity is due largely to scattering from these voids, while the WAXS intensity derives from the secondary structures of macromolecular material surrounding the voids. The ability to detect and map the presence of voids within thin sections of fixed tissue has the potential to provide novel information on the degradation of human brain tissue in neurodegenerative diseases.

Soft X-ray spectroscopy is an important technique for measuring the fundamental properties of materials. However, for measurements of samples in the sub-millimetre range, many experimental setups show limitations. Position drifts on the order of hundreds of micrometres during thermal stabilization of the system can last for hours of expensive beam time. To compensate for drifts, sample tracking and feedback systems must be used. However, in complex sample environments where sample access is very limited, many existing solutions cannot be applied. In this work, we apply a robust computer vision algorithm to automatically track and readjust the sample position in the dozens of micrometres range. Our approach is applied in a complex sample environment, where the sample is in an ultra-high vacuum chamber, surrounded by cooled thermal shields to reach sample temperatures down to 2.5 K and in the center of a superconducting split coil. Our implementation allows sample-position tracking and adjustment in the vertical direction since this is the dimension where drifts occur during sample temperature change in our setup. The approach can be easily extended to 2D. The algorithm enables a factor of ten improvement in the overlap of a series of X-ray absorption spectra in a sample with a vertical size down to 70 µm. This solution can be used in a variety of experimental stations, where optical access is available and sample access by other means is reduced.

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

Conic sections are commonly used in reflective X-ray optics. Hyperbolic mirrors can focus a converging light source and are frequently paired with elliptical or parabolic mirrors in Wolter type configurations. This paper derives the closed-form expression for a mirror-centered hyperbolic shape, with zero-slope at the origin. Combined with the slope and curvature, such an expression facilitates metrology, manufacturing and mirror-bending calculations. Previous works consider ellipses, parabolas, magnifying hyperbolas or employ lengthy approximations. Here, the exact shape function is given in terms of the mirror incidence angle and the source and image distances.

Hard X-ray microscopes with 20–30 nm spatial resolution ranges are an advanced tool for the inspection of materials at the nanoscale. However, the limited efficiency of the focusing optics, for example, a Fresnel zone plate (ZP) lens, can significantly reduce the power of a nanoprobe. Despite several reports on ZP lenses that focus hard X-rays with 20 nm resolution – mainly constructed by zone-doubling techniques – a systematic investigation into the limiting factors has not been reported. We report the structural effects on the focusing and imaging efficiency of 20–30 nm-resolution ZPs, employing a modified beam-propagation method. The zone width and the duty cycle (zone width/ring pitch) were optimized to achieve maximum efficiency, and a comparative analysis of the zone materials was conducted. The optimized zone structures were used in the fabrication of Pt-hydrogen silsesquioxane (HSQ) ZPs. The highest focusing efficiency of the Pt-HSQ-ZP with a resolution of 30 nm was 10% at 7 keV and >5% in the range 6–10 keV, whereas the highest efficiency of the Pt-HSQ-ZP with a resolution of 20 nm was realized at 7 keV with an efficiency of 7.6%. Optical characterization conducted at X-ray beamlines demonstrated significant enhancement of the focusing and imaging efficiency in a broader range of hard X-rays from 5 keV to 10 keV, demonstrating the potential application in hard X-ray focusing and imaging.

The UAE has announced the introduction of 'Palm ID' technology, a payment solution that utilises the unique vein patterns in individuals' palms for...

The general equation of the δ direct methods is established and applied in its difference form to the definition of one of the two residuals that constitute the SMAR phasing algorithm. These two residuals use the absolute value of ρ and/or the zero conversion of negative Fourier ripples (≥50% of the unit-cell volume). Alternatively, when solved for ρ, the general equation provides a simple derivation of the already known δM tangent formula.

Attorney General Merrick Garland ordered a pause on federal executions Thursday while the Justice Department reviews policies and procedures on capital punishment.; Credit: Win McNamee/Getty Images

Attorney General Merrick Garland has imposed a moratorium on scheduling federal executions, the Department of Justice announced on Thursday. The department will review its policies and procedures on capital punishment, following a wave of federal executions carried out under the Trump administration.

In a memo to the Justice Department, Garland justified his decision to halt the deeply controversial practice, citing factors including its capricious application and outsized impact on people of color.

"The Department of Justice must ensure that everyone in the federal criminal justice system is not only afforded the rights guaranteed by the Constitution and laws of the United States, but is also treated fairly and humanely. That obligation has special force in capital cases," Garland said in the memo.

"Serious concerns have been raised about the continued use of the death penalty across the country, including arbitrariness in its application, disparate impact on people of color, and the troubling number of exonerations in capital and other serious cases," he added. "Those weighty concerns deserve careful study and evaluation by lawmakers."

Under former President Donald Trump, the federal government carried out its first executions in a generation last year, with 13 inmates put to death in Trump's final year in office. That included an unprecedented number of federal killings carried out in the last days of his single-term presidency, bucking a nearly century-and-a-half practice of pausing capital punishments during the presidential exchange of power.

Then-Attorney General William Barr said the executions were being carried out in cases of "staggeringly brutal murders." Civil rights activists had rallied to spare the lives of those on death row. Concerns of how humanely the sentences could be carried out, as well as the recent exonerations of a number of death row inmates, were major factors in the demonstrations to cease state-sanctioned killings.

"The Department must take care to scrupulously maintain our commitment to fairness and humane treatment in the administration of existing federal laws governing capital sentences," Garland said in his memo on Thursday.

President Biden, who nominated Garland to the top law enforcement post, opposes capital punishment. During his campaign, Biden pledged to pass legislation to end the federal death penalty.

Some congressional Democrats have been working on such legislation, but no action has been taken. Some progressives and activists opposed to capital punishment had been expressing frustration that they have not seen more movement on the issue from Biden.

"A moratorium on federal executions is one step in the right direction, but it is not enough," said Ruth Friedman, director of the Federal Capital Habeas Project. "We know the federal death penalty system is marred by racial bias, arbitrariness, over-reaching, and grievous mistakes by defense lawyers and prosecutors that make it broken beyond repair."

Friedman said Biden should commute all federal death sentences, warning that a pause alone "will just leave these intractable issues unremedied and pave the way for another unconscionable bloodbath like we saw last year."

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

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

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

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.

Hydraulic fracturing has a low risk for inducing earthquakes that can be felt by people, but underground injection of wastewater produced by hydraulic fracturing and other energy technologies has a higher risk of causing such earthquakes, says a new report from the National Research Council.

Efforts to convert civilian research reactors from weapon-grade highly enriched uranium (HEU) to low enriched uranium (LEU) fuels are taking significantly longer than anticipated, says a congressionally mandated report from the National Academies of Sciences, Engineering, and Medicine.

A new congressionally mandated report from the National Academies of Sciences, Engineering, and Medicine takes a comprehensive look at evidence on the human health effects of e-cigarettes.

A new report from the National Academies of Sciences, Engineering, and Medicine examines evidence on whether providing permanent supportive housing (PSH) – a combination of stable housing and supportive services -- to individuals who are experiencing homelessness improves their health.

Five years after a landmark National Academies report on eyewitness identification, a lead author reflects on its impact.

A new report from the National Academies of Sciences, Engineering, and Medicine says using laboratory dogs in research at the U.S. Department of Veterans Affairs (VA) is scientifically necessary for only a few areas of current biomedical research.

As many nations around the world have struggled with high rates of infections and deaths from COVID-19, Taiwan has kept the number of deaths from the disease to less than 10 — by drawing upon its previous experience with SARS, said chemical engineer Pam Cheng, speaking at last week’s annual meeting of the National Academy of Engineering.

To detect soreness in Tennessee walking horses, only veterinarians should administer inspections at shows, a new report from the National Academies of Sciences, Engineering, and Medicine recommends.

The Executive Office of the President should consider establishing a task force to prevent renter evictions and mitigate housing instability caused by the pandemic, says a new report from the National Academies of Sciences, Engineering, and Medicine.

Scientific thinking and knowledge are essential to democracy and the workforce, but science education is not the national priority it needs to be. The White House, with leadership from OSTP, should encourage federal agencies, state and local governments, and others to focus resources on increasing the quality and accessibility of science education.

This Guidance Document is a product of the National Academies’ Action Collaborative on Preventing Sexual Harassment in Higher Education, which presents information and identifies guidance based on existing research literature.

Advanced manufacturing brings the potential for positive transformational change to a variety of areas, including the defense industry. It is essential that universities, companies, and the government take steps to better prepare the next generation of engineers to work with these emerging technologies.

Research funded by NIH that uses nonhuman primates is critical to the nation’s ability to respond adequately to public health emergencies and carry out high-impact biomedical research, but gaps in the systems that support research using these animal models are undermining national health emergency readiness.

The discovery of the NGate malware by ESET Research is another example of how sophisticated Android threats have become

There’s a growing phenomenon in CIOs’ lives, and it’s called Shadow IT: other departments like finance and marketing bypassing the IT department and buying their own technology.

Every year some of the world’s best young musicians would jet into London to audition for a bursary with the Southbank Sinfonia. Simon Over wanted to cut down on those thousands of air miles and hours in transit. He also didn’t want to miss out on youngsters who couldn’t afford the fare.

About 73% of Instagram business accounts that self-identify as a women-owned business were set up in the last three years in India, the company revealed.

The use of the technology will also require individual's consent, the CAC said in a statement. It added that non-biometric identification solutions should be favored over facial recognition in cases where such methods are equally effective.

Snack and bakery companies rely on a wide range of logistics and warehousing technology in their operations. 

Snack Food & Wholesale Bakery was recently able to chat with United Soybean Board consultants Jean Heggie and Pam Smith, RDN, Shaping America's Plate, about soy ingredients for baking and frying, as well as the versatility of soybean oil.

We were recently able to connect with two professionals at Stratas to chat about different types of oils used in the preparation of breakfast foods and snacks.

The fermentation of dough leads to a strengthening of the dough matrix. Dough conditioners and oxidizers like azodicarbonamide (ADA), bromate and ascorbic acid, as well as their enzyme counterparts, lead to the strengthening of the dough matrix.

From cloud computing to the Internet of Things (IoT), Industry 4.0 is essential for modern-day snack and bakery companies, especially during the COVID-19 pandemic.

There is a lot of confusion in cookie and cracker manufacturing today. Let’s focus on one of the major areas of confusion: leavening.

Cost, safety, efficiency, footprint, operator familiarity, and the ability to meet regulations are among the key factors that snack and bakery facilities need to consider when deciding whether to keep and refurbish an old piece of equipment, or send it to the scrap heap and buy new.

PEX can be a viable alternative to more traditional materials for fire sprinklers.

Hybrid systems that run on propane and solar can be tailored to a project’s unique needs, providing lower first costs and reduced ongoing energy costs and emissions.

There are multiple ways to dehumidify a space — mechanical, reheat and desiccant to name a few. The biggest issue has been that conventional air conditioning units are only 10% effective at removing humidity. Until now, standard de-humidification systems were expensive to purchase and install.

Efficient fleet management is essential for plumbing and HVAC contractors looking to optimize operations and improve service. Customizing fleet vehicles to meet specific company needs is a key strategy. Modern upfitting now includes advanced technology and ergonomic designs, creating mobile workstations that boost efficiency on job sites.

Meanwhile, the fate of the estate tax could affect small businesses for years to come.

Let me clue you in on a poorly kept secret: Traditional advertising is expensive. I know, this isn’t exactly shocking. Depending on your market, a month-long rental of a billboard could cost five figures. A week’s worth of 15-second radio ads can run up to $8,000 — and that doesn’t include the cost of producing them. And television? Forget it.

The schedule of free-to-attend, accessible webinars cover Casella’s core areas of expertise, including workplace monitoring for noise, environmental boundary, hand and arm vibration, and asbestos sampling.

When it comes to managing the risk associated with employee safety, the risk manager usually looks to the safety department to address that area.

Key Housing is a best-in-class provider of corporate rentals throughout California from Walnut Creek to Long Beach.

Key Housing is a best-in-class provider of corporate rentals throughout California from Southern to Northern California.

Key Housing is a best-in-class provider of corporate rentals throughout California from Southern to Northern California. The company is announcing its January 2024 featured listing for the Orange County region.