Holograms are often displayed in science fiction as colorful, life-sized projections. But what seems like the technology of the future is actually the technology of the present. In Applied Physics Reviews, by AIP Publishing, researchers developed an acoustic metasurface-based holography technique that uses a deep learning algorithm to generate and iteratively improve a hologram of the Mona Lisa.
Tracing volatile organic compounds is important for public safety and all “smell” related issues. To this end, in Applied Physics Reviews, Liu et al. introduce a fluid mechanics-based chamber design for an electronic nose that consistently detects VOCs at low concentrations. The strategy, which includes using a shuntlike device to control the behavior of fluid flow, is a step forward in e-nose technology development.
In APL Bioengineering, researchers design a novel algorithm for controlling implanted insulin pumps that accounts for the unique characteristics of individual patients. Their model, tested using an FDA-approved diabetes computer simulation, proves intraperitoneal (within the abdominal cavity) insulin delivery is fast and closely mimics natural physiological insulin delivery. They developed a model that can account for individual patient differences and validated a pump control algorithm that does not require meal announcement.
In Physics of Fluids, researchers conduct a series of experiments that explore how changing key parts of the gummy-making process affects the final product, as well as how the candies behave in different storage temperatures. The group adjusted a variety of inputs while making the gummies, from the glucose syrup-to-sucrose ratio to starch and gelatin concentrations, to understand how these changes affected features like candy texture, moisture content, and pH. They used these results to identify the most shelf-stable combination for gummy candies.
The Journal of Mathematical Physics has selected Tom Hutchcroft for the 2022 JMP Young Researcher Award. Hutchcroft’s winning publication, “Sharp hierarchical upper bounds on the critical two-point function for long-range percolation on ℤd,” demonstrated that hierarchical percolation models provide good quality estimates when compared to Euclidean models. A panel of expert judges selected Hutchcroft for the $3,000 prize, which recognizes JMP authors within eight years of receiving their doctorate. His paper will be highlighted on the journal’s website.
Chaos congratulates Yuzuru Kato, Thomas Lilienkamp, and Tiemo Pedergnana for winning the journal’s 2022 Edward N. Lorenz Early Career Awards. Kato was recognized for introducing a definition of a phase function for quantum rhythmic systems, Lilienkamp was commended for developing a low-energy and safer approach to defibrillation, and Pedergnana was selected for work to better understand if and how an exact potential, which greatly simplifies analysis of the Langevin equation, can be found for a given system. The winners will split a $2,000 honorarium and are invited to contribute a perspective article to the journal.
The University of Arizona’s Husain Alqattan is the recipient of the APL Photonics 2022 Future Luminary Award for his work in utilizing pulse shaping and waveform synthesis to control electron motion and open the door for ultrafast electronics that process data at unprecedented speeds. The winning paper, “Attosecond light field synthesis,” was published in the April 2022 issue of APL Photonics. The award recognizes early-career researchers with the potential to become luminaries in the field of photonics.
In Physics of Fluids, researchers from the University of Alberta study the flight performance of the mountain pine beetle from a fluid mechanics and an entomological perspective. Understanding these aspects of the insect’s flight could improve estimates of its spread through the environment and preserve pine forests. To examine insect flight, the team employed a type of model previously used for idealized airfoils. They showed that it can be successfully applied to multiple individual animals across biological sex, insect age, and body size. In doing so, the model can predict how these factors impact flight characteristics.
In Physics of Fluids, University of Huddersfield researchers explore the role of uneven coffee extraction using a simple mathematical model. They split the coffee into two regions to examine whether uneven flow does in fact make weaker espresso. One of the regions in the model system hosted more tightly packed coffee than the other, which caused an initial disparity in flow resistance. The extraction of coffee decreased the flow resistance further. Understanding the origin of uneven extraction and avoiding or preventing it could enable better brews and substantial financial savings by using coffee more efficiently.
This year and next, Americans will have the extraordinary opportunity to witness two solar eclipses as both will be visible throughout the continental U.S. Both occurrences promise to be remarkable events and teachable moments but preparation is essential. In The Physics Teacher, astronomer Douglas Duncan of the University of Colorado provides a practical playbook to help teachers, students, and the general public prepare for the eclipse events. He also shares ways to fundraise for schools and organizations and guidance for safe eclipse-viewing.
In APL Machine Learning, researchers develop a deep learning model to classify cancer cells by type. The tool requires only a simple microscope and a small amount of computing power, producing results on par or better than more sophisticated and complex techniques. After feeding an image into the neural network, the tool converts the data to a probability. A result lower than 0.5 categorizes the cancer as one cell type, while a number higher than 0.5 designates another. The tool reached over 94% accuracy across the data sets used in the study.
In Physics of Fluids, researchers develop a model to describe the interaction between a rocket plume and the surface of a planetary body in near-vacuum conditions. The computational framework takes in information about the rocket, its engines, and the surface composition and topography, as well as the atmospheric conditions and gravitational forces at the landing site, and the results can be used to evaluate the safety and feasibility of a proposed landing site and to optimize the design of spacecraft and rocket engines for planetary landings.
In Physics of Fluids, researchers model the behavior of blood drops during secondary atomization to examine how the phenomenon affects a crime scene. The team examined different starting droplet sizes, confirming their model with experiments. They found the effect of secondary atomization was significant and predictable: The smaller droplets were easier to sweep up by the firearm’s gases and turn around toward the victim. This discovery could explain how a short-range shooter might stay clean from blood stains.
In Biointerphases, researchers develop a fabrication method to increase the efficacy and longevity of membrane separation technology. The team created a nanofibrous membrane with electrospinning, in which a liquid polymer droplet is electrified and stretched to make fibers, and increased the roughness of the membrane surface by loading it with silver nanoparticles. In water, this rough surface promotes a stable layer of water, which acts as a barrier to prevent oil droplets from entering the membrane. The technology is greater than 99% effective at separating a petroleum ether-in-water emulsion.
Scientists carried out an analysis of hundreds of popular song recordings from 1946 to 2020 to determine the lead vocal to accompaniment ratio, or LAR. The study considered the four highest-ranked songs from the Billboard Hot 100 chart for each year and the results show that, contrary to expectations, the LAR for popular music decreased over the decades in question. This means that, relative to their bands, lead singers are getting quieter.
In Physics of Fluids, researchers develop an early warning system that combines acoustic technology with AI to immediately classify earthquakes and determine potential tsunami risk. They propose using underwater microphones, called hydrophones, to measure the acoustic radiation produced by the earthquake, which carries information about the tectonic event and travels significantly faster than tsunami waves. The computational model triangulates the source of the earthquake and AI algorithms classify its slip type and magnitude. It then calculates important properties like effective length and width, uplift speed, and duration, which dictate the size of the tsunami.
In APL Energy, researchers developed a proof of concept for a superconducting highway that could transport vehicles and electricity, cooling the necessary superconductors with a pipeline of liquid hydrogen. Most magnetic levitation designs feature the superconductor inside the vehicle, which is suspended above a magnetic track. The authors decided to flip that arrangement upside down, putting the superconductor on the ground and giving each vehicle a magnet. The result is a system with multiple uses, placing it within the realm of affordability.
The AAAS's inaugural Mani L. Bhaumik Breakthrough of the Year Award honors recognizes Maj. Gen. Charles Frank Bolden Jr., USMC (Ret), a former administrator of NASA; John Mather, senior project scientist of the JWST since 1995; and Bill Ochs, JWST project manager from 2011 through the telescope’s launch. The award selection committee seeks to acknowledge not only the winners’ individual contributions, but also the teams they inspired, whose collective work has given us all a completely different view of the universe.
AIP has selected Richard Fitzgerald as the new editor-in-chief of Physics Today, the most influential and closely followed physics magazine in the world and a unifying influence for the diverse areas of physics and related sciences. Fitzgerald moves into this role after nearly 25 years of increasing leadership on the Physics Today team.
The exact mechanism of cartilage breakdown in osteoarthritis is unknown, but damage from mechanical stress with insufficient self-repair is believed to be the main culprit. The composition of synovial fluid, or joint lubricant, changes significantly: The concentration and molecular weight of hyaluronic acid tends to decrease. In Biointerphases, researchers explore the disease-driven breakdown of hyaluronan and the mechanistic implications of these changes on the lubrication and subsequent wear of joints.
In Physics of Fluids, researchers develop a computational model of stormwater piping to study storm geysers. They used this model to understand why storm geysers form, what conditions tend to make them worse, and what city planners can do to prevent them from occurring.
In Applied Physics Letters, researchers in the U.K. introduce a novel imaging method to detect gold nanoparticles in woodlice. Their method, known as four-wave mixing microscopy, flashes light that the gold nanoparticles absorb. The light flashes again and the subsequent scattering reveals the nanoparticles’ locations. With information about the quantity, location, and impact of gold nanoparticles within the organism, scientists can better understand the potential harm other metals may have on nature.
The Journal of Chemical Physics is pleased to announce Bingqing Cheng and Katrin Erath-Dulitz as the 2022 winners of the JCP Best Paper by an Emerging Investigator Awards. Cheng was selected for research that exploits machine learning to understand and predict material properties and Erath-Dulitz was recognized for developing a method that controllably prepares chemical reactions to explore their quantum nature. Each winner will receive a $2,000 honorarium and is invited to write a perspective article for JCP.
According to some estimates, up to 80% of patients who experience a ruptured abdominal aortic aneurysm will die before they reach the hospital or during surgery. But early intervention can prevent rupture and improve outcomes. In Physics of Fluids, researchers make a computational model of the cardiovascular system in order to predict early AAA rupture and monitor patients’ blood vessel conditions. They mimicked specific health conditions and investigated various hemodynamic parameters using image-based computational blood dynamics.
In APL Bioengineering, researchers develop a 3D cell culture system to test how inhibiting fibroblast activities can help treat lung cancer. To simulate the tumor microenvironment and mimic real tissues, the team co-cultured lung cancer cells and fibroblasts in a 3D matrix. The researchers then tested the anti-cancer drug cisplatin with and without two anti-fibrotic drugs, nintedanib and pirfenidone. They found that combining the anti-fibrotic drug nintedanib with the anti-cancer drug cisplatin increased the efficacy of the latter.
In Biophysics Reviews, researchers identify the most promising advancements and greatest challenges of artificial mitochondria and chloroplasts. The team describes the components required to construct synthetic mitochondria and chloroplasts and identifies proteins as the most important aspects for molecular rotary machinery, proton transport, and ATP production. The authors believe it is important to create artificial cells with biologically realistic energy-generation methods that mimic natural processes; replicating the entire cell could lead to future biomaterials.
In Chaos, a team of scientists from Spain and Argentina present an original oscillating short-term memory model to study the dynamics of landing events at 10 major European airports. The model can estimate how landing volumes will influence those in consecutive hours – a critical ability given airport capacity constraints and external events that cause landing delays. Altogether, the model demonstrates that statistical analyses of hourly plane landing volumes can yield valuable insights into airport operations.
AIP is pleased to announce physicist Valerie Browning as the newest member of the Institute’s Board of Directors. Her appointment is effective March 24. Browning is the Vice President for Research and Technology in the Corporate Technology Office at Lockheed Martin, where she leads transformational research and design projects that bring together industry, academia, and government organizations.
AIP has selected Mahouton Norbert Hounkonnou as the winner of the 2023 John Torrence Tate Medal for International Leadership in Physics. The award committee selected Hounkonnou “for leadership in building and maintaining an enduring transnational African mathematical physics research and education community, in particular the COPROMAPH conferences and schools and Academy level international networks.” The award includes a certificate of recognition, bronze medal, and $10,000 prize and Hounkonnou will be presented with the medal during an upcoming physical sciences community event.
Scientists in China have developed a modeling technique to study urban traffic flows and show that their model can be used to find previously unknown bottlenecks. The model uses a modified form of percolation theory, and the investigators considered the existing road network and population distribution in Shanghai.
Additive manufacturing of food involves designing, pre-processing, manufacturing, and post-processing, and each step is an opportunity to create innovative foods. In Physics of Fluids, researchers identify factors that affect the print quality and shape complexity of the food created. For example, changing the printing patterns and ingredients of the initial mix or paste can affect the food’s matrix and microstructures and therefore its texture. Accounting for these features can increase food quality, improve control, and speed up printing.
In JASA, researchers explore how anatomical variations in a speaker’s vocal tract affect speech production. Using MRI, the team recorded the shape of the vocal tract for 41 speakers as the subjects produced a series of representative speech sounds. They averaged these shapes to establish a sound-independent model of the vocal tract. Then they used statistical analysis to extract the main variations between speakers. A handful of factors explained nearly 90% of the differences between speakers.
In APL Bioengineering, researchers create a biomimetic model to study wound healing in burn and laceration wounds. The team designed an in vitro model system made of fibroblasts embedded in a collagen hydrogel. Wounds were created in this microtissue using a microdissection knife to mimic laceration or a high-energy laser to simulate a burn. They discovered that fibroblasts clear away damaged tissue before depositing new material. This part of the healing process is slower in burn wounds.
In a world experiencing growing inequality and intolerance, tools borrowed from science and mathematics could be the key to understanding and preventing prejudice. In Chaos, Luis A. Martinez-Vaquero applies evolutionary game theory, which combines techniques from economics and biology, and complex system analysis to investigate the relationship between inequality and intolerance. He found that inequality boosts intolerance and that redistribution of wealth can prevent its infectious spread.
Practical carbon capture technologies are still in the early stages of development, with the most promising involving a class of compounds called amines that can chemically bind with carbon dioxide. In AVS Quantum Science, researchers deploy an algorithm to study amine reactions through quantum computing. An existing quantum computer cab run the algorithm to find useful amine compounds for carbon capture more quickly, analyzing larger molecules and more complex reactions than a traditional computer can.
Milutin Milankovitch hypothesized that the timing of glacial transitions has been controlled by the orbital parameters of the Earth, which suggests that there may be some predictability in the climate, a notoriously complex system. In Chaos, Stefano Pierini proposes a new paradigm to simplify the verification of the Milankovitch hypothesis. Pierini’s “deterministic excitation paradigm” combines the physics concepts of relaxation oscillation and excitability to link Earth’s orbital parameters and the glacial cycles in a more generic way.
AIP is seeking applications for the 2023 Robert H.G. Helleman Memorial Fellowships, which will support Dutch graduate students and postdoctoral researchers as they pursue research in physics and its related subdisciplines in the U.S. Applications for the 2023 fellowships are underway and due March 15. AIP and its Center for History of Physics will select the fellows in May. For information about eligibility, application, and criteria, visit the AIP Robert H.G. Helleman Memorial Fellowships website.
In APL Bioengineering, researchers describe how gut-on-a-chip devices can bridge lab models and human biology. Modeling the microbiome is particularly difficult because of its unique environmental conditions, but through creative design, gut-on-a-chip devices can simulate many of these properties, such as the gut’s anaerobic atmosphere, fluid flow, and pulses of contraction/relaxation. Growing intestinal cells in this environment means that they more closely resemble human biology compared to standard laboratory cell cultures.
AIP Foundation and the Society of Physics Students have partnered with Google to award up to 20 $2,500 scholarships to physics and astronomy undergraduate students. Applicants must be undergraduate members of SPS and have at least one full semester remaining at the time of the award. The committee will consider applicants’ interest and perseverance in physics or astronomy, their effort and potential, and their active participation in their physics department, clubs, and programs outside the classroom. Applications are due March 15/
The TEAM-UP Together Scholarship Program is underway and will continue to accept applications for its next round of need-based scholarships until April 7. The scholarship program is one of TEAM-UP Together’s strategies aimed at doubling the number of African Americans earning bachelor’s degrees in physics and astronomy by 2030. The awards of $10,000 per academic year are to be used for tuition, fees, or supplies. To apply, students must be African American or Black undergraduates majoring in physics or astronomy at accredited U.S. colleges or universities.
In Journal of Applied Physics, a team of scientists fabricate sensitive nanostructured silver surfaces to detect arsenic, even at very low concentrations. The sensors make use of surface-enhanced Raman spectroscopy: As a molecule containing arsenic adheres to the surface, it's hit with a laser and the arsenic compound scatters the laser light, creating an identifiable signature. The technique is a departure from existing methods, which are time-consuming, expensive, and not ideally suited to on-site field assays.
In APL Photonics, researchers design a solar harvester with enhanced energy conversion capabilities. The device employs a quasiperiodic nanoscale pattern, meaning most of it is an alternating and consistent pattern, while the remaining portion contains random defects that do not affect its performance. The fabrication process makes use of self-assembling nanoparticles, which form an organized material structure based on their interactions with nearby particles without any external instructions. Thermal energy harvested by the device can be transformed to electricity using thermoelectric materials.
The Journal of Chemical Physics and the APS Division of Chemical Physics announce Haiming Zhu as the winner of the JCP-DCP Future of Chemical Physics Lectureship in recognition of his contributions to the understanding of the photophysical properties of emerging optoelectronic materials and processes using spatio-temporal resolved ultrafast spectroscopy.
When the Artemis 1 mission was launched in November, it became the world’s most powerful rocket, and with liftoff came a loud roar heard miles away. In JASA Express Letters, researchers report noise measurements during the launch at different locations around Kennedy Space Center. The data collected can be used to validate existing noise prediction models, which are needed to protect equipment as well as the surrounding environment and community. These data will be useful as more powerful lift vehicles are developed.
Researchers have analyzed brewing with numerical simulations to predict an array of beer foam features. Publishing their work in Physics of Fluids, they demonstrate that their model can determine foam patterns, heights, stability, beer/foam ratio, and foam volume fractions. The study presents the first use of a computational approach called a multiphase solver to tackle beer heads.
Researchers recently modeled the transmission of COVID-19 within an isolation room at the Royal Brompton Hospital in London, U.K. Their goal was to explore the optimal room layout to reduce the risk of infection for health care staff. To accomplish this, they used an adaptive mesh finite-element computational fluid dynamics model to simulate 3D spatial distribution of the virus within the room — based on data collected from the room during a COVID-19 patient’s stay. They share their findings and guidance in Physics of Fluids.
AIP is pleased to announce Anna Lee as the new executive director of AIP Foundation. Starting February 1, Lee will lead the foundation as it magnifies philanthropic support of the Institute. Her appointment as executive director will bring valuable leadership and strategic direction to the foundation as it continues to share the history of the physical sciences, motivate and encourage a new generation of scientists, attract and inspire new partners, and support AIP priorities through critical fundraising opportunities.
The Heineman Foundation, AIP, and AAS are pleased to announce Karen Meech, astronomer at the Institute for Astronomy, University of Hawai’i, as the winner of the 2023 Dannie Heineman Prize for Astrophysics. Meech was selected “for her pioneering work in expanding and pushing boundaries in the field of small body solar system observational science, and for making transformative contributions to shape the broader field of planetary science in general.” She will be awarded $10,000 and a certificate and invited to give a talk at a future AAS meeting.
In the "butterfly effect," an insect can flap its wings and create a microscopic change in initial conditions that leads to a hurricane halfway around the world. This chaos is seen everywhere, from weather to labor markets to brain dynamics. And now, in the journal Chaos, researchers explored how to turn the twisting, fractal structures behind the science into jewelry with 3D printing. The jewelry shapes are based on the Chua circuit, a simple electronic system that was the first physical, mathematical, and experimental proof of chaos.
Nonpharmaceutical interventions slowed the spread of COVID-19 and other infectious diseases but now, as NPIs are lifted, countries are seeing a resurgence in several respiratory diseases. In Chaos, scientists, using data from Hong Kong to develop their model, describe a threshold control method that can be used to predict the best time to lift NPIs without overwhelming the hospital systems when these other respiratory diseases inevitably surge back. They found that reintroducing NPI measures when a threshold of 600 severe cases is reached could ensure that the hospital system in Hong Kong is not overwhelmed by severely infected patients.
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