Saturday, October 14, 2023

University of Houston secures $1.6 million grant to advance STEM education for underserved high school students


Grant and Award Announcement

UNIVERSITY OF HOUSTON

STEM Grant Team 

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FRONT ROW (LEFT TO RIGHT): DR. JERROD HENDERSON, ASSISTANT PROFESSOR, COLLEGE OF ENGINEERING; DR. MARIAM MANUEL, CLINICAL ASSISTANT PROFESSOR, COLLEGE OF NATURAL SCIENCE & MATHEMATICS; DR. DONNA STOKES, ASSOCIATE DEAN FOR UNDERGRADUATE AFFAIRS AND STUDENT SUCCESS, PROFESSOR, COLLEGE OF NATURAL SCIENCE & MATHEMATICS

BACK ROW (LEFT TO RIGHT): DR. APRIL PETERS HAWKINS, PROFESSOR, COLLEGE OF EDUCATION; DR. JACQUELINE EKEOBA, CLINICAL ASSISTANT PROFESSOR, COLLEGE OF NATURAL SCIENCE & MATHEMATICS; MARVIN PIERRE, EXECUTIVE DIRECTOR,  8 MILLION STORIES

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CREDIT: JEFF LAUTENBERGER/UNIVERSITY OF HOUSTON




Researchers at the University of Houston received a $1.6 million grant from the National Science Foundation (NSF) for a community partnership to provide a culturally responsive STEM experience to underserved high school students enrolled in alternative schooling systems in the city of Houston.

The recently funded Racial Equity through Student Engagement and Teaching in STEM (RESET in STEM) program, an idea borne from UH’s successful STEM RISE program, aims to address the systemic barriers that hinder economically and socially disadvantaged students’ access to STEM education and create a more inclusive and equitable educational environment.

“These students aren’t just underserved, they’re underestimated,” said Mariam Manuel, clinical assistant professor in teachHOUSTON, a UH program dedicated to producing secondary STEM teachers. “Our goal is to empower minoritized students from historically marginalized backgrounds to thrive in STEM fields.”

According to Manuel, from 2017 to 2019, Black professionals made up just 9% of STEM workers in the U.S., lower than their 11% share of the overall U.S. workforce. The gap was even larger for Hispanic professionals, who made up only 8% of people working in STEM while they were 17% of the total workforce.

“This program is about instilling confidence, resilience and a sense of belonging in students,” Manuel said. “By giving them opportunities through mentorship and research lab experiences, we are paving the way for a more diverse and inclusive STEM workforce which will benefit society as a whole.”

RESET in STEM is a collaboration between the College of Natural Sciences and Mathematics, College of Education and Cullen College of Engineering as well as Eight Million Stories, Inc., a community-based non-profit that works with local school districts and community organizations and supports at-promise students in education completion, industry-based certifications and wraparound services.

“As an organization that prides itself on supporting and advancing Houston’s most marginalized student population, we are constantly looking for a stronger connection to college and career readiness,” said Marvin Pierre, executive director of Eight Million Stories. “This program will provide our students with a bridge to support through tutoring, research experiences and other key components that students need to unlock their potential.”

The program includes funds to provide scholarships to 40 undergraduate STEM majors and 40 high school students over the course of four years. Students from Houston area high schools including Jack Yates, Wheatley, Madison and Worthing high schools will participate in an on-campus, six-week summer program to engage in a STEM research lab experience. And during the school year, the students will attend workshops focused on college and career readiness.

“We will use a layered mentoring concept that goes beyond the summer STEM labs,” Manuel said. “They’ll get to meet regularly with UH undergraduate STEM student mentors who will help them prepare college essays and applications, meet with university counselors and get tutoring to help prepare them for core math and science content.”

UH undergraduate STEM majors completing the teachHOUSTON program will take the Research Methods in STEM course, which will be offered in conjunction with the immersive laboratory experience and a focus on anti-discriminating practices in informal STEM spaces.

“The undergraduate mentors will gain insight into doing contextualized science and math from a research perspective as well how to teach their future students to engage in the research process,” said Jacqueline Ekeoba, clinical assistant professor for teachHOUSTON. “It is imperative that our preservice teachers are confident in their STEM identities when facilitating opportunities that will encourage a sense of belonging within their own students.”

The grant will also fund student stipends, allowing them to participate in the program without interrupting their afterschool or summer jobs. It will also help cover transportation to and from campus.

“It’s a big commitment for the students and we want to make sure we’re giving them financial support as many of them would otherwise need to work over the summer,” Manuel said. “We are working to help dimmish the opportunity gap and dismantle barriers that keep students from being able to participate in STEM activities.”


Texas A&M-led team receives USDA grant to

 study cattle respiratory disease prevention


Grant and Award Announcement

TEXAS A&M UNIVERSITY

Dr. Matthew Scott 

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DR. MATTHEW SCOTT, ASSISTANT PROFESSOR OF MICROBIAL ECOLOGY AND INFECTIOUS DISEASE AT THE VETERINARY EDUCATION, RESEARCH, & OUTREACH PROGRAM AT THE TEXAS A&M SCHOOL OF VETERINARY MEDICINE & BIOMEDICAL SCIENCES.

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CREDIT: TEXAS A&M UNIVERSITY




Researchers from the Veterinary Education, Research, & Outreach (VERO) program at the Texas A&M School of Veterinary Medicine & Biomedical Sciences (VMBS) have received $300,000 from the United States Department of Agriculture’s National Institute of Food and Agriculture to study the costliest disease in the cattle industry, bovine respiratory disease (BRD).

The grant will fund a highly collaborative project involving Mississippi State University, West Texas A&M University and Texas A&M AgriLife that looks at the effects of vaccination and management strategies on the cattle immune system and microflora, specifically as it relates to BRD.

BRD costs the cattle industry around $1 billion each year in prevention, management and treatment fees, as well as in herd losses. Though scientists have studied BRD for decades, the ability to accurately predict which individual animals will contract BRD remains elusive, making management strategies less effective.

Old Problems

For the last 50 to 60 years, BRD has been the No. 1 cause of disease and death in cattle feedlots of North America. It has a high morbidity rate, accounting for 35 to 50% of all diagnosed disease, which means that infected herds often experience significant losses.

Despite having been the focus of research for decades, BRD is difficult to prevent because there are many factors that can affect whether an individual animal contracts BRD.

“Age, proximity to other cattle with BRD, vaccination status and individual immune response are just some of the contributing factors,” said Dr. Matthew Scott, an assistant professor of microbial ecology and infectious disease at VERO.

The variety of factors can make it hard to predict exactly which animals will get sick and which ones will resist infection. 

“Sometimes low-risk cattle still get sick,” Scott said. “Sometimes really high-risk cattle — the ones coming from multiple sources with no management or vaccines at all — don’t get sick. So, there’s a lot of incongruences at the individual level and we don’t really know why.”

Vaccines and management strategies, such as physically separating cattle that are vulnerable to BRD, are typically the most reliable way to keep cattle healthy.

“Those are the two main tactics we have in preventing BRD,” Scott said. “We can use these tactics to predict whether a herd is at high or low risk for BRD infection, which is information crucial to producers who may be buying or selling those animals.”

Separating out animals that have been deemed vulnerable to BRD can mean keeping them away from commercial sale barns, where hundreds or thousands of animals may be brought together, putting their immune systems in jeopardy and making it easier for BRD to spread.

“It’s the equivalent of having your kid start kindergarten,” Scott said. “All these kids go to school for the first time, and after the first week everyone has a runny nose. Cattle can be no different in that regard.”

Unfortunately, risk assessment only helps scientists predict general patterns of BRD transmission; it hasn’t been successful in predicting which individual cows will get sick.

New Strategies

The goal of the new NIFA-funded project is to try to understand what makes some cattle more susceptible to BRD than others. Scott and his team expect the project to take about two years.

“We have two main objectives,” Scott said. “First, we’re going to take samples from a variety of cattle and keep track of them throughout their entire life cycle. This way, we can know which cows eventually get sick and which ones don’t. Then, we can look at their gene expression and see what may be affecting their immune systems on the molecular level.

“Secondly, we’re going to look at samples taken from the upper respiratory tracts of these animals to analyze the microbial community — things like bacteria, viruses and fungi that may be present — so we can understand how they may be affecting the cattle’s internal ecosystem,” he said.

This stage of the project will also include examining what is called the host transcriptome, which is the measurement of all the messenger RNA in an animal at a given time. Having all that information allows researchers to see the expression and function of approximately 20,000 genes at one time.

Comparing the microbial community with the host transcriptome will give researchers an incredibly detailed picture of what’s going on inside cattle respiratory systems at the cellular and molecular level. Together with the life cycle data, Scott and his team will be able to see what factors impact susceptibility at both the macro and micro levels to an unprecedented degree.

To get the necessary data, Scott’s team will collaborate with several cattle facilities, including the AgriLife Beef Management Station in Bushland and Prairie Livestock in Mississippi, which is affiliated with Mississippi State University. 

Scott’s team will also partner with West Texas A&M University for sample collection and data analysis.

Ongoing And Future Directions

Conveniently, the new project shares quite a bit of overlap with an ongoing VERO-led research project that is now in its third year, in collaboration with AgriLife, Mississippi State University, Kansas State University and West Texas A&M University. In fact, the new project will collect samples from the same groups of cattle as the ongoing one, which saves time for the researchers.

“The ongoing project takes a more traditional epidemiological approach,” Scott said. “We’re looking at how different management strategies and the use of vaccination influence rates of BRD in cattle using health markers in the blood. For example, how much does choosing not to move calves through a sale barn keep them safe from infection?” 

The information from the combined projects goes toward assisting researchers in developing new and more effective strategies, including vaccines, for helping prevent, detect and treat BRD. 

“Given how much the industry loses to BRD, the economic benefits of the research can’t be overstated,” Scott said.

On top again: UTA wins national award for noise control engineering


UTA students have won noise control engineering award four out of last five years


Grant and Award Announcement

UNIVERSITY OF TEXAS AT ARLINGTON

UT Arlington 2023 Beranek Award winners 

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UT ARLINGTON 2023 BERANEK AWARD WINNERS

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CREDIT: UT ARLINGTON




For the fourth time in five years, students at The University of Texas at Arlington have won a prestigious national award for noise control engineering.

Ross Everett and Bret Johnson, mechanical engineering students who graduated in May 2023, earned the Leo Beranek Student Medal for Excellence in the Study of Noise Control from the Institute of Noise Control Engineering of the USA for their work to decrease cabin noise in the autonomous rideshare cars owned by May Mobility that operate around UTA’s campus. The institute awards the medal annually to outstanding undergraduate and graduate students at North American colleges and universities that have courses for noise control engineering.

“We’re proud and happy to earn this award and to have been part of a team of people who made it possible,” Johnson said. “It really makes the hours feel worth it, and there’s a sense of accomplishment that comes from being recognized not just by our peers and the University, but also by people with no connection to us or our project.”

The duo and their senior design team—Nicholas McDonald, Amir Yonan, Fernando Alejandre and Grant Roney—worked with May Mobility to reduce loud noise from a computer fan mounted in the front passenger seat area of May Mobility’s vehicles, which created an unpleasant environment for riders. The team also published a paper, “Soundproofing Autonomous Vehicle Computers for Passenger Comfort,” in the Proceedings of the National Conference on Noise Control Engineering.

“We primarily focused on where the noise was coming from and applied soundproofing foams to surround the computer as necessary so that it wouldn’t overheat and the foam wasn’t visible,” Everett said. “We were very proud of our work, and seeing it come full circle was a really big honor.”

“I am glad to see the students were able to apply their knowledge and testing skills to solve a real-world problem and have a direct impact on the local community,” said Yawen Wang, an assistant professor of research and director of the Vibro-Acoustics and Sound Quality Research Laboratory at UTA. “Their work is important to the improvement of the autonomous driving experience and the further advancement of urban mobility. The award is a testament to their hard work and excellence in the study of noise control engineering.”

The Vibro-Acoustics and Sound Quality Research Laboratory develops integrated computational, experimental and analytical approaches to powertrain/structure dynamics, vibro-acoustics, active noise and vibration control, and data-driven techniques for condition monitoring and prognostics. Wang and his team work with companies such as Caterpillar, Daimler, Dana, Ford, General Motors, John Deere, Toyota, Oracle and many others.

Two of the previous three winners of the Leo Beranek Medal were graduate students. Ashish Dev Kotian, a master’s graduate in mechanical engineering, was honored in 2019 for his work designing, fabricating and testing a muffler for the University’s Formula SAE team, and Chia-Ching Lin, a doctoral student in aerospace engineering, was honored in 2020 for his research in hypoid gear noise and vibration control in automotive rear axle systems. Manya Singh, a senior undergraduate student in mechanical engineering, was honored in 2022 for her approach to  decreasing cabin noise in the May Mobility cars.

 

LSU Health’s fish study finds clinic-based community program improved food security and health



Peer-Reviewed Publication

LOUISIANA STATE UNIVERSITY HEALTH SCIENCES CENTER




Baton Rouge, LA – The FISH (Food Insecurity and its Sequalae on Health) Study, led by Tiffany Wesley Ardoin, MD, FACP, Assistant Professor of Clinical Medicine at LSU Health New Orleans’ Baton Rouge Regional Campus, reports that a clinic-based community program improved food security scores, healthy eating behaviors, and depression scores in a vulnerable, food-insecure population in Baton Rouge, Louisiana. The findings are published in the MDPI journal, Nutrients, available here.

            The collaborative Geaux Get Healthy Clinical Program, created in 2020 and directed by LSU Health’s Dr. Wesley Ardoin at a North Baton Rouge Our Lady of the Lake clinic where she practices, provides comprehensive education and access to resources while leveraging community partnerships and a clinical setting as an intervention to improve food insecurity.

            “This program has been a long time in the making and is the result of collaboration between LSU Health New Orleans’ Baton Rouge Regional Campus, Our Lady of the Lake Regional Medical Center, local Baton Rouge government, large organizations such as American Heart Association and local community-based organizations,” notes Dr. Wesley Ardoin. “It is unique in that we don’t just give food or money to people, but we provide education and access to resources to promote sustainable change.”

            The Geaux Get Healthy Clinical Program includes in-person, hands-on cooking classes, a nutrition class, and a grocery store tour using the American Heart Association Healthy for Life Curriculum. The curriculum was enhanced to be more health-literate and culturally relevant based on feedback from participants and team members. The classes included both group education and hands-on guidance with floating community volunteers. Participants are encouraged to bring one family member or friend for support. Educational topics include sodium and sugar restrictions in relation to hypertension and diabetes, portion control, food safety, chopping skills, eating seasonal produce, etc. The cooking and nutrition classes took place at the clinic, and the grocery store tour occurred within a Dollar General outfitted with fresh produce adjacent to the clinic.

            The FISH study is a prospective cohort that studies the effects of the Geaux Get Healthy Clinical Program. The design is a one-group, pre-post evaluation over two years. FISH eligibility included English-speaking Geaux Get Healthy Clinical Program participants aged 18–65 years. All study participants were food insecure. They had all scored at least a 2 on the USDA U.S. Adult 6-question Screening Module to qualify for the program. A total of 57 research participants with food insecurity completed the program. Mean food security scores improved at the completion of program, and these scores further improved 6 months after enrollment.

            “This work is timely as the White House and the American Heart Association have both made big announcements within the last year on ways they want to address Food Insecurity in the United States,” adds Dr. Wesley Ardoin. “Food Insecurity has a 14% prevalence in Louisiana and is directly related to many chronic medical conditions. We hope that this work can be a starting point for future research that can pave the way for programming that will promote healthy eating and improve health in Louisiana and beyond.”

            Food insecurity is significantly associated with many health conditions and poor health outcomes. While it is directly linked to body fat, it is also associated with depression, anxiety, hyperlipidemia, diabetes, and hypertension independent of the body mass index (BMI). One study found that households with significant food insecurity had a higher incidence of hypertension (36.1%) compared to those without food insecurity (19.7%). Food insecurity is also correlated with an increased risk of chronic health conditions such as coronary heart disease, hepatitis, stroke, cancer, asthma, COPD, and chronic kidney disease.

            The authors write, “Addressing food insecurity is complex due to the diverse range of factors contributing to its fluctuating nature, spanning from the production and distribution of food to individual challenges such as living in a food desert, financial constraints, or lack of knowledge and resources when purchasing and preparing nutritious meals. To date, there is no standardized design for programs addressing food insecurity.”

With the improvement in food insecurity and nutrition behaviors, the Geaux Get Healthy Clinical Program may serve as a model for other programs addressing food insecurity in the future.

Other authors included Dr. Donald Mercante at LSU Health New Orleans School of Public Health, Elizabeth Perry at Our Lady of the Lake Hospital, Chelsea Morgan at the American Heart Association, and Jared Hymowitz at HealthyBR, the Mayor’s Healthy City Initiative for Baton Rouge.

The FISH Study was funded by LSU Health New Orleans’ Research Enhancement Program Clinical Research Grant, grant number 5498208018. The Geaux Get Healthy Clinical Program at Our Lady of the Lake received financial support from the Humana Foundation, the Blue Cross Blue Shield of Louisiana Foundation through HealthyBR and by Healthy Blue Louisiana.

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LSU Health Sciences Center New Orleans educates Louisiana's health care professionals. The state's flagship health sciences university, LSU Health New Orleans includes a School of Medicine with campuses in Baton Rouge and Lafayette, the state's only School of Dentistry, Louisiana's only public School of Public Health, and Schools of Allied Health Professions, Nursing, and Graduate Studies. LSU Health New Orleans faculty take care of patients in public and private hospitals and clinics throughout the region. In the vanguard of biosciences research in a number of areas in a worldwide arena, the LSU Health New Orleans research enterprise generates jobs and enormous economic impact. LSU Health New Orleans faculty have made lifesaving discoveries and continue to work to prevent, advance treatment, or cure disease. To learn more, visit http://www.lsuhsc.eduhttp://www.twitter.com/LSUHealthNO, or http://www.facebook.com/LSUHSC.                                                   

 

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What can we learn from the Great Resignation?


A study out of the Complexity Science Hub (CSH) pinpoints some of the forces behind the Great Resignation and suggests mental health topics contributed to the wave of quitting in the US.


Peer-Reviewed Publication

COMPLEXITY SCIENCE HUB VIENNA

Shifts in the work discourse 

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THE FIGURE SUMMARIZES THE CHANGES IN TOPIC PREVALENCE WITHIN THE WORK DISCOURSE. TOPICS WITH INCREASED PREVALENCE ARE COLORED BLUE, WHILE THOSE WITH DECREASED PREVALENCE ARE COLORED GREEN.

THE TOPICS WITH THE LARGEST INCREASE IN PREVALENCE ARE: WORKING FROM HOMESWITCHING JOBSWORK-RELATED DISTRESSREMOTE JOBS, AND MENTAL HEALTH. ADDITIONALLY, FIVE TOPICS RELATED TO JOB QUITTING INCREASED THEIR PREVALENCE – QUITTING A NEW JOBHATE JOB & WANT TO QUITRESIGNATION LETTERQUIT, AND GUILT ABOUT LEAVING FOR A BETTER JOB

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CREDIT: COMPLEXITY SCIENCE HUB





[Vienna, October 13 2023] -- The Great Resignation appears to be ending, according to economists. But what can companies and leaders learn from the rapid pace of job-quitting in recent years in order to prevent employees from leaving? A study out of the Complexity Science Hub (CSH) pinpoints some of the forces behind the Great Resignation and suggests mental health topics contributed to the wave of quitting in the US. 

The researchers analyzed the work discourse on the social media platform Reddit between 2018 and 2021. “We wanted to understand the reasons for the surge in quit rates after the Covid-19 pandemic in the US,” says Maria del Rio-Chanona, a CSH research fellow and first author of the study recently published in EPJ Data Science.

“One thing to note is that after recessions there is always a spike in quits. People switching jobs is not new, but the surge in quits in 2021 was a record high. So that brought the question, what makes this time different?,” adds del-Rio Chanona. 

Real time

“Reddit offered us the possibility to study this emerging economic phenomenon in real time,” explains the researcher. Del Rio-Chanona and her colleagues focused on the forum ‘r/jobs’, where more than a hundred thousand people shared their work-related questions and concerns. Reddit posts are semi-anonymous and unrestricted in length, allowing users to express themselves freely and in detail.

In the study, the team used topic modeling, a machine learning technique that discovers conversation topics from large-scale text data, to identify the most common concerns in the work discourse on Reddit. 

“Our main finding is that the pandemic exacerbated the already growing mental health concerns among workers, and we show that such concerns became disproportionately present in the discourse of quit-related posts since the onset of the pandemic,” observe del Rio-Chanona and colleagues.

New forces

The results show that posts about mental health and work-related distress – for instance, expressing feelings of anxiety, stress, and overwhelm at work – were more likely to involve quitting. In other words, when talking about quitting, people discussed mental health concerns more often than before or than other people discussing work. People's motivation to quit may have been influenced by distressing work experiences and fears about their mental health, suggest del Rio-Chanona and colleagues. 

“Our findings indicate that the Covid-19 pandemic unleashed forces that contributed to quit behavior, such as mental health concerns, that were less salient during previous economic recoveries,” evaluates Ljubica Nedelkoska, a senior researcher at CSH and co-author of the study. “These new forces could help explain the unusually high rates of quitting in 2021.”

Changes

In spite of concerns about mental health and work-related distress at the start of the pandemic, things changed along the Great Resignation – likely due to better employment opportunities, according to the researchers. “With better job opportunities in 2021, posts about salary negotiations, job offers and promotions increased,” points out del Rio-Chanona. 

“People talked less about quitting because they hated their job, and more about negotiating salaries and discussing job offer issues. Some of the people quitting in 2021 might have strongly disliked their job in 2020, but did not quit until 2021, when there were better employment prospects,” explain the researchers.

The future?

Tens of millions of Americans quit their jobs during the Great Resignation, but fewer are doing so this year, leading experts to conclude that the phenomenon is over. Now the question is, from this point forward, what can be done? According to Nedelkoska, the Great Resignation provided us with a chance to reflect on how people work, as well as improve company practices. Del Rio-Chanona emphasizes the importance of putting an emphasis on employees' relational and self-fulfillment needs in the future. “In light of the current debate about how new technologies are reinventing work, it is crucial to use technology to improve working conditions.”

 

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About the Complexity Science Hub

The mission of the Complexity Science Hub (CSH) is to host, educate, and inspire complex systems scientists dedicated to making sense of Big Data to boost science and society. Scientists at the Complexity Science Hub develop methods for the scientific, quantitative, and predictive understanding of complex systems.

The CSH is a joint initiative of AIT Austrian Institute of Technology, Central European University CEU, Danube University Krems, Graz University of Technology, Medical University of Vienna, TU Wien, VetMedUni Vienna, Vienna University of Economics and Business, and Austrian Economic Chambers (WKO). https://www.csh.ac.at

 

 

 

Astronomy: One small step towards lunar roads



Peer-Reviewed Publication

SCIENTIFIC REPORTS




It may be possible to create paved roads and landing pads on the Moon by using lasers to melt lunar soil into a more solid, layered substance, reports a proof-of-concept study in Scientific Reports. Although these experiments were carried out on Earth using a substitute for lunar dust, these findings demonstrate the viability of the technique and suggest it could be replicated on the Moon. However, further work may be needed to refine the process, according to the authors.

Moon dust poses a significant challenge to lunar rovers as, due to the low levels of gravity, it tends to float around when disturbed and can damage equipment. Therefore, the infrastructure such as roads and landing pads will be essential to mitigate dust issues and facilitate transport on the Moon. However, transporting materials for construction from Earth is costly, so it will be essential to use the resources available on the Moon.

Ginés-Palomares, Miranda Fateri, and Jens Günster melted a fine-grained material called EAC-1A (developed by ESA as a substitute for lunar soil) with a carbon dioxide laser to simulate how lunar dust can be melted by focused solar radiation on the Moon into a solid substance. The authors experimented with laser beams of different strengths and sizes (up to 12 kilowatts and 100 milimetres across respectively) in order to create a robust material, although they established that criss-crossing or overlapping the laser beam path led to cracking. They developed a strategy using a 45 millimetre diameter laser beam to produce triangular, hollow-centred geometric shapes approximately 250 millimetres in size. These could be interlocked to create solid surface across large areas of lunar soil which could serve as roads and landing pads, suggest the authors.

To reproduce this approach on the Moon, the authors calculate that a lens of approximately 2.37 metres squared would need to be transported from Earth to act as a sunlight concentrator in place of the laser. The relatively small size of equipment needed would be an advantage in future Moon missions.

 

Cleaner snow boosts future snowpack predictions


Less pollution means a cleaner, less diminished snowpack


Peer-Reviewed Publication

DOE/PACIFIC NORTHWEST NATIONAL LABORATORY





RICHLAND, Wash.—Less pollution settling into snow should help cut the decline of snowpack in the Northern Hemisphere later this century. Though the snowpack will still diminish due to rising temperatures, the outlook is less dire when the cleaner snow of the future is considered.

 

In some scenarios, the researchers predict that the reduction in snowpack will be less than half what has been predicted—good news for the many people who rely on subsequent snowmelt in high mountains for water and food production, as well as for those who depend on winter recreation.

 

The findings come from scientists at the Department of Energy’s Pacific Northwest National Laboratory who weighed several factors that affect snowpack. These include warming temperatures, pollution, dust and even the shape of snow grains as they pack together on the ground.

 

The findings were published October 2 in Nature Communications.

 

Clean snow vs. dirty snow

“Snow is not just snow,” said Dalei Hao, first and corresponding author of the study. “There’s clean snow and there’s dirty snow, and how they respond to sunlight is very different. And then there are the shapes of the snow grains, which are anything but uniform. These all affect the snowpack.”
 

Of course, the warmer it is, the more snow melts. That’s why the coming decades spell bad news for mountain snowpacks and the people who rely on them. Researchers estimate that 2 billion people rely on spring and summer snowmelt in the mountains to provide fresh water for drinking and food production. If mountain snow melts faster or earlier than usual, that spells trouble—swollen rivers and flooding in the spring, then parched crops and wells in late summer.

 

“There have been a lot of alarming projections about the future snowpack. It’s a critically important issue,” said PNNL scientist Ruby Leung, also a corresponding author of the study. “The Himalayas, for instance, are the headwaters for several major rivers in southeast and eastern Asia. The condition of the snowpack in mountains has a direct effect on the quality of life for millions of people.”

 

Of all the factors affecting future snowpack, the biggest in the study were temperature and the effect of dark particles like pollution and dust. Those particles absorb more sunlight than pure snow, warming faster and passing along the sun’s warmth to nearby snow. That’s why snow peppered with dark specks melts faster than clean snow.

 

These particles come from human activity, such as car and truck emissions or burning wood. Or they can come naturally from blowing dust—though how much dust blows and settles on snow is often a direct result of what people do.

 

While clean snow reflects an estimated 80 to 90 percent of sunlight, dirty snow reflects less—a huge variable that the PNNL team said has not been studied as thoroughly as the effect of temperature. Researchers believe that cleaner snow can be expected in the future, due to less pollution and less wood burning.

 

 

Warmer air vs. cleaner snow

But the cleaner snow will most certainly come at a time of warmer temperatures, which lower the snowpack in many ways. The simplest explanation is that less precipitation falls as snow and more as rain. Warmer temperatures also melt the snow that has fallen.

 

“Warming temperatures and cleaner snow are competing effects,” said Leung. “Our paper indicates that the warming effect is dominant, but that cleaner snow will cancel out some of the effect. We are not saying that snow will increase in the future. We’re saying that snow will not decrease in the future as much as it otherwise might.”

 

The researchers studied snowpack trends in high mountains in the Northern Hemisphere, using 1995-2014 as the historical basis. That period of rising temperatures and a dirty snowpack was a recipe for a very fast snow melt. Then they modeled snowpack trends from 2015 to 2100 using two different scenarios, one where carbon dioxide emissions continue to rise markedly and one where emissions decline. The team focused on the Tibetan Plateau in Asia and the western United States.

 

In both scenarios, temperatures are expected to warm; the deposition of dark particles known as black carbon is expected to decrease; and dust is expected to increase.

 

If carbon dioxide emissions rise due to continued fossil fuel use in a scenario known as the Shared Socioeconomic Pathway or SSP 585, temperatures rise significantly. When changes in dark particles aren’t considered, the team estimates a snowpack loss of about 58 percent. But cleaner snow from less pollution—even with more light-absorbing dust—reduces that loss by 8 percent.

 

If carbon dioxide emissions are curtailed significantly (SSP 126), snowpack loss is much less. When changes in dark particles aren’t considered, the team estimates a snowpack loss of about 15 percent. But when the cleaner snow is factored in, snowpack loss is slashed by more than half—52 percent.

 

The diversity of snow grain shapes and other factors

Anyone who has driven in a blizzard can attest to the chaos and uncertainty that can be caused by snow. That’s also true for scientists like Hao who are finding a not-so-subtle effect of snow grain shape.

 

Earlier this year, Hao and colleagues noted that the varied shapes of real snow grains make snow melt more slowly than in models where grains are assumed to be uniformly spherical. Spherical snow grains would absorb more sunlight and melt more snow; the odd shapes of real flakes reflect more sunlight and melt less snow. The findings were reinforced this summer by a team of French scientists.

 

That would mean that real snow packed on the ground melts more slowly than many models using “spherical flakes” have indicated. That’s part of the reason for the team’s findings.

 

A bevy of other factors come into play as well. For example, warmer temperatures translate to more wildfires, producing more dark particles. But Hao notes that wildfire activity peaks in the summer and fall, before snow falls in heavy amounts in the mountains, so the effect in late spring when snow melts would likely be minimal.

 

Then there’s the loss of “biological soil crust,” where bacteria, lichens, algae and other organisms infiltrate and stabilize the soil surface. Researchers expect this type of soil to be reduced as temperatures warm—one reason, along with increased land development, that more dust is expected in the future.

]

While there are many factors in play, the PNNL team found that rising temperatures and reduced dark particles are the two most powerful factors influencing the future snowpack.

“Most models have not looked at these two effects, warming and dirty snow, together when projecting future changes,” said Leung. “It’s important to do so, because they can have opposite effects. Determining which one is the more dominant influence is a key to determining the fate of the snowpack in the future.”

 

In addition to Hao and Leung, authors include PNNL scientists Gautam Bisht, Hailong Wang, Donghui Xu, Huilin Huang and Yun Qian.

 

The research was funded by DOE’s Office of Science. The team used computing resources at the National Energy Research Scientific Computing Center, a DOE Office of Science user facility at Lawrence Berkeley National Laboratory.

 

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Physicists demonstrate powerful physics phenomenon


Study hints at new way to improve on spintronics for future tech


Peer-Reviewed Publication

OHIO STATE UNIVERSITY




COLUMBUS, Ohio – In a new breakthrough, researchers have used a novel technique to confirm a previously undetected physics phenomenon that could be used to improve data storage in the next generation of computer devices. 

Spintronic memories, like those used in some high-tech computers and satellites, use magnetic states generated by an electron’s intrinsic angular momentum to store and read information. Depending on its physical motion, an electron’s spin produces a magnetic current. Known as the “spin Hall effect,” this has key applications for magnetic materials across many different fields, ranging from low power electronics to fundamental quantum mechanics. 

More recently, scientists have found that electrons are also capable of generating electricity through a second kind of movement: orbital angular momentum, similar to how Earth revolves around the sun. This is known as the “orbital Hall effect,” said Roland Kawakami, co-author of the study and a professor in physics at The Ohio State University. 

Theorists predicted that by using light transition metals – materials that have weak spin Hall currents – magnetic currents generated by the orbital Hall effect would be easier to spot flowing alongside them. Until now, directly detecting such a thing has been a challenge, but the study, led by Igor Lyalin, a graduate student in physics, and published today in the journal Physical Review Letters, showed a method to observe the effect.

“Over the decades, there’s been a continuous discovery of various Hall effects,‘’ said Kawakami. “But the idea of these orbital currents is really a brand new one. The difficulty is that they are mixed with spin currents in typical heavy metals and it’s difficult to tell them apart.” 

Instead, Kawakami’s team demonstrated the orbital Hall effect by reflecting polarized light, in this case, a laser, onto various thin films of the light metal chromium to probe the metal’s atoms for a potential build-up of orbital angular momentum. After nearly a year of painstaking measurements, researchers were able to detect a clear magneto-optical signal which showed that electrons gathered at one end of the film exhibited strong orbital Hall effect characteristics. 

This successful detection could have huge consequences for future spintronics applications, said Kawakami.

“The concept of spintronics has been around for about 25 years or so, and while it’s been really good for various memory applications, now people are trying to go further,” he said. “Now, one of the field’s biggest goals is to reduce the amount of energy consumed because that’s the limiting factor for jacking up performance.”

Lowering the total amount of energy needed for future magnetic materials to operate well could potentially enable lower power consumption, higher speeds and higher reliability, as well as help to extend the technology’s lifespan. Utilizing orbital currents instead of spin currents could possibly save both time and money in the long term, said Kawakami. 

Noting that this research opens up a way to learn more about how these strange physics phenomena arise in other kinds of metals, the researchers say they want to continue delving into the complex connection between spin Hall effects and orbital Hall effects.

Co-authors were Sanaz Alikhah and Peter M. Oppeneer of Uppsala University and Marco Berritta of both Uppsala University and the University of Exeter. This work was supported by the National Science Foundation, the Swedish Research Council, the Swedish National Infrastructure for Computing and the K. and A. Wallenberg Foundation.

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Contact: Roland Kawakami, Kawakami.15@osu.edu

Written by: Tatyana Woodall, Woodall.52@osu.ed