A new polymorph (form II) is reported for the 1:1 dimethyl sulfoxide solvate of 2,3,5,6-tetra­fluoro-1,4-di­iodo­benzene (TFDIB·DMSO or C6F4I2·C2H6SO). The structure is similar to that of a previously reported polymorph (form I) [Britton (2003). Acta Cryst. E59, o1332–o1333], containing layers of TFDIB mol­ecules with DMSO mol­ecules between, accepting I⋯O halogen bonds from two TFDIB mol­ecules. Re-examination of form I over the temperature range 300–120 K shows that it undergoes a phase transformation around 220 K, where the DMSO mol­ecules undergo re-orientation and become ordered. The unit cell expands by ca 0.5 Å along the c axis and contracts by ca 1.0 Å along the a axis, and the space-group symmetry is reduced from Pnma to P212121. Refinement of form I against data collected at 220 K captures the (average) structure of the crystal prior to the phase transformation, with the DMSO mol­ecules showing four distinct disorder com­ponents, corresponding to an overlay of the 297 and 120 K structures. Assessment of the inter­molecular inter­action energies using the PIXEL method indicates that the various orientations of the DMSO mol­ecules have very similar total inter­action energies with the molecules of the TFDIB framework. The phase transformation is driven by inter­actions between DMSO mol­ecules, whereby re-orientation at lower temperature yields significantly closer and more stabilizing inter­actions between neighbouring DMSO mol­ecules, which lock in an ordered arrangement along the shortened a axis.

To describe multiple Bragg reflection from a thick, ideally imperfect crystal, the transport equations are reformulated in three-dimensional phase space and solved by spectral collocation in the depth coordinate. Example solutions illustrate the orientational spread of multiply reflected rays and the distortion of rocking curves, especially for finite detectors.

A Landau theory for the wurtzite-based heterovalent ternary semiconductor ZnSnN2 is developed and a first-order reconstructive phase transition is proposed as the cause of observed crystal structure disorder. The model infers that the phase transition is paraelectric to antiferroelectric.

Vaishnavi Ananthanarayanan
Apr 17, 2020; 133:jcs245928-jcs245928
Meeting Report

Global money transfer service Azimo has announced waiving fees for transfers to Nigeria as the...

A bold national initiative is needed to reduce the enormous health burden of sexually transmitted diseases (STDs) in the United States, according to a new report from a committee of the Institute of Medicine.

While every mode of transportation in the U.S. will be affected as the climate changes, potentially the greatest impact on transportation systems will be flooding of roads, railways, transit systems, and airport runways in coastal areas because of rising sea levels and surges brought on by more intense storms, says a new report from the National Research Council.

Nurses roles, responsibilities, and education should change significantly to meet the increased demand for care that will be created by health care reform and to advance improvements in Americas increasingly complex health system, says a new report from the Institute of Medicine.

Every year, approximately 100 million* adult Americans experience chronic pain, a condition that costs the nation between $560 billion and $635 billion annually, says a new report from the Institute of Medicine.

Educational and business leaders want todays students both to master school subjects and to excel in areas such as problem solving, critical thinking, and communication

Americas health care system has become too complex and costly to continue business as usual, says a new report from the Institute of Medicine

Efforts to control brucellosis in the Greater Yellowstone Area (GYA) should focus on reducing the risk of transmission from elk, which are now viewed as the primary source of the infection in new cases occurring in cattle and domestic bison, says a new report by the National Academies of Sciences, Engineering, and Medicine.

The number of patients in the U.S. awaiting organ transplantation outpaces the amount of transplants performed in the U.S., and many donated organs are not transplanted each year due to several factors, such as poor organ function, says a new report from the National Academies of Sciences, Engineering, and Medicine.

With the sharp and largely unexpected increase in the long-distance movement of domestically produced crude oil, ethanol, and natural gas since 2005, a number of concerns have arisen about the safe transport of these hazardous materials, particularly in relation to railroad track defects, rural communities’ emergency response preparedness, and the older tank car designs that will continue to be used in multi-car unit trains, says a new report from the National Academies of Sciences, Engineering, and Medicine.

Consumer access to effective and affordable medicines is an imperative for public health, social equity, and economic development, but this need is not being served adequately by the biopharmaceutical sector, says a new report from the National Academies of Sciences, Engineering, and Medicine.

To enable public transit agencies to engage in more rigorous and effective safety planning, their safety planning records should not be admissible as evidence in civil litigation, says a new report from the National Academies of Sciences, Engineering, and Medicine.

The U.S. Environmental Protection Agency has issued a proposed rule for strengthening transparency in regulatory science (April 30, 2018, 83 Federal Register 18768), which stipulates that EPA will ensure that the data and models underlying the pivotal science that informs significant regulatory actions are made publicly available, in a format that allows for outside analysis and validation.

Current federal safety regulations for small distribution systems used for propane and other liquefied petroleum gases (LPGs) should be improved for clarity, efficiency, enforceability, and applicability to risk, says a new reportfrom the National Academies of Sciences, Engineering, and Medicine.

Victoria A. Arroyo, executive director of the Georgetown Climate Center, and Leslie S. Richards, secretary of transportation for the Pennsylvania Department of Transportation (PennDOT), have been appointed as chair and vice chair, respectively, to the 2019 Transportation Research Board (TRB) Executive Committee, which provides oversight of TRB activities.

A new report from the National Academies of Sciences, Engineering, and Medicine presents a research roadmap to address gaps and uncertainties in estimating the impacts of proposed changes in truck size and weight limits -- the regulations that set the maximum weights, lengths, and numbers of trailers allowed for trucks on U.S. highways.

More than 13,000 people – including industry leaders, policymakers, administrators, and researchers from government, industry, and academia – are expected to gather for the Transportation Research Board’s 98th Annual Meeting.

While computational reproducibility in scientific research is generally expected when the original data and code are available, lack of ability to replicate a previous study -- or obtain consistent results looking at the same scientific question but with different data -- is more nuanced and occasionally can aid in the process of scientific discovery, says a new congressionally mandated report from the National Academies of Sciences, Engineering, and Medicine.

Chemical separations — which are used to divide chemical mixtures into their distinct elements — are critical in providing many of the foods and services needed to maintain our quality of life.

You can find a nurse navigating city streets, on her way to a home visit. Or, maybe he is recording educational videos on preventing ear infections. She might even be running for city council.

For her role in transforming a safety net hospital into a national model for high-quality, cost-efficient health care, the National Academy of Medicine today announced Patricia Gabow is the recipient of the 2019 Gustav O. Lienhard Award for Advancement of Health Care.

Nearly 14,000 people – including industry leaders, policymakers, administrators, and researchers from government, industry, and academia – are expected to gather for the Transportation Research Board’s 99th Annual Meeting, taking place at the Walter E. Washington Convention Center in Washington, D.C., from Jan. 12-16, 2020.

Autonomous vehicles (AV) took center stage at the Chair’s Luncheon of the Transportation Research Board’s annual meeting today.

India-based merchant payment and lending service provider BharatPe has announced disbursing funds...

The web is made up of terrific content from all over the world and sometimes the content you want to read is written in a different language. Thankfully, Google Chrome has built-in support for the Google Translate service, which will automatically translate the page into a language of your choice. [...]

Henry E. Huntington in 1907.; Credit: Theo C. Marceau, New York City. The Huntington Library, Art Museum, and Botanical Gardens

One of the most prized treasures of LA County is 100 years old this year.

The Huntington Library is beloved for its lush botanical gardens and fine art.

As KPCC's Brianna Flores reports, you can trace its origins to a pivotal moment in Southern California history.

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

The National Science Foundation: Creating knowledge to transform our future

The National Science Foundation: Creating knowledge to transform our future

The pandemic has highlighted the need for businesses to act with alacrity and prepare for the long haul – and to do so with cybersecurity in mind

The post Digital transformation could be accelerated by COVID‑19 appeared first on WeLiveSecurity

South-Africa based PSP Thumbzup and cloud service distributor

New research has investigated the many ways in which technological transfer occurs for wind power projects in developing countries. These range from trading with developed countries, to local innovation. In India and China, successful transfer was found to depend more on existing capabilities in these countries than international projects, such as the Clean Development Mechanism (CDM).

A new study of attitudes towards transport and mobility has identified five groups of travellers. The groups differ significantly in their choice of transport, distance travelled and the impact their transport choices have on the environment in terms of greenhouse gas (GHG) emissions.

A new framework to help decide whether to translocate species that are threatened by climate change has been developed. The framework provides a simple method of assessing different strategies and ensuring that limited budgets are used effectively.

People living close to road, rail and aircraft noise are likely to experience negative health effects. Long-term noise exposure may lead to problems with their heart and circulatory (cardiovascular) system and night-time noise is particularly disruptive of sleep patterns, which in turn may lead to cardiovascular health problems, a review of research into the effects of noise on cardiovascular diseases has found.

New research has investigated the many ways in which technological transfer occurs for wind power projects in developing countries. These range from trading with developed countries, to local innovation. In India and China, successful transfer was found to depend more on existing capabilities in these countries than international projects, such as the Clean Development Mechanism (CDM).

New research on climate-driven reductions in Arctic sea ice has predicted that, by 2040 to 2059, new shipping routes will become passable across the Arctic, linking the Atlantic and Pacific oceans. An increase in traffic has implications for the ecosystems of this fragile area.

Genpact sees over 100 clients closing their financial quarter digitally while others are doubling the pace of adoption of digital transformation.

Two papers published by an assistant professor at the University of California, Riverside and several collaborators explain why the universe has enough energy to become transparent.

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Transaction costs can be incurred during various phases of environmental policy making, from planning through to enforcement. A recent study has examined what influences these costs and concluded that policy selection and evaluation could benefit from a better understanding of the causes of these transaction costs.

Cisco unified communications (UC) give your teams the freedom to be productive from anywhere, on any device. Available as one of our Cisco cloud services using Hosted Collaboration Solution (HCS) or as an on-premises solution, Cisco UC lets you access presence, instant messaging, voice, video, voice messaging, desktop sharing, and conferencing.