In spite of the tremendous progress made over the last 80 years, important gaps in our understanding of the hydrogen phase diagram remain, with arguably the most challenging issue being the solid-to-liquid melting transition at ultra-high pressures. A new study in the U.K. has looked at the melting of hydrogen by computer simulation, for the first time taking the quantum motion of the protons into account explicitly.
Computer science researchers have programmed a computer to play the game Concentration (also known as Memory). The work could help improve computer security and improve our understanding of how the human mind works. The researchers developed a program to get the software system called ACT-R, a computer simulation that attempts to replicate human thought processes, to play Concentration.
According to NASA, there are more than 21,000 pieces of “space junk roughly the size of a baseball in orbit, and about 500,000 pieces that are golf ball-sized. These pieces can be dangerous, which is why researchers at Texas Advanced Computing Center’s supercomputers are simulating orbital debris impacts on spacecraft and fragment impacts on body armor to help NASA design better shielding.
The National Institute of Standards and Technology this week announced that it plans to establish a new Advanced Materials Center of Excellence to facilitate collaborations between NIST and researchers from academia and industry on advanced materials development. Fund at about $25 million over five years, the center will emphasize innovations in measurement technology, modeling, simulation, and data and informatics tools
How do fish swim? It is a simple question, but there is no simple answer. Researchers at Northwestern Univ. have revealed some of the mechanical properties that allow fish to perform their complex movements. Their findings could provide insights in evolutionary biology and lead to an understanding of the neural control of movement and development of bio-inspired underwater vehicles.
JMAG is a powerful finite element analysis (FEA) tool that allows engineers to develop, analyze, and fine-tune electric motors and generators, taking into account such diverse factors as thermal, structural, and vibration issues. This week, Maplesoft has launched a new product that allows users to combine JMAG with the advanced physical modeling approach of MapleSim. This allows engineers to produce high-fidelity system models.
The first successful modeling of fluid and gas flows was accomplished by the aerospace industry, which recognized the advantages such understanding could have for successful aircraft design. Now, the once exotic application of Navier-Stokes equations for the modeling of flows is performed on just about anything, from the world’s largest hydropower plant to a mundane rear-view mirror on a car.
Researchers report that they have determined the precise chemical structure of the HIV capsid, a protein shell that protects the virus’s genetic material and is a key to its virulence. The capsid has become an attractive target for the development of new antiretroviral drugs. The researchers used the University of Illinois’ supercomputer Blue Waters to determine the complete HIV capsid structure.
When a solar flare filled with charged particles erupts from the sun, its magnetic fields sometimes break a widely accepted rule of physics. The flux-freezing theorem dictates that the magnetic lines of force should flow away in lock-step with the particles, whole and unbroken. Instead, the lines sometimes break apart and quickly reconnect in a way that has mystified astrophysicists.
Leading nanoscientists created beautiful, tiled patterns with flat nanocrystals, but they were left with a mystery: Why did some sets of crystals arrange themselves in an alternating, herringbone style? To find out, they turned to experts in computer simulation at the University of Michigan and the Massachusetts Institute of Technology.
Scientists have long observed that species seem to have become increasingly capable of evolving in response to changes in the environment. But computer science researchers now say that the popular explanation of competition to survive in nature may not actually be necessary for evolvability to increase.
Scientists at Lawrence Livermore National Laboratory and the University of California, Berkeley have discovered new materials to capture methane, the second highest concentration greenhouse gas emitted into the atmosphere. The research team performed systematic computer simulation studies on the effectiveness of methane capture using two different materials—liquid solvents and nanoporous zeolites.
A team of researchers at the San Diego Supercomputer Center (SDSC) and the University of California, San Diego, has developed a highly scalable computer code that promises to dramatically cut both research times and energy costs in simulating seismic hazards throughout California and elsewhere. The accelerated makes heavier use of graphic processing units (GPUs) than CPUs.
One of the most powerful supercomputers in the world, was recently declared available for use at the National Center for Supercomputing Applications at the University of Illinois at Urbana-Champaign (UIUC). Capable at peak performance of nearly 12 quadrillion floating point operations per second, Blue Waters has, more importantly, demonstrated sustained system performance of more than one petaflop on a range of commonly-used science and engineering applications.
A once-promising approach for using next-generation, ultra-intense lasers to help deliver commercially viable fusion energy has been brought into serious question by new experimental results and first-of-a-kind simulations of laser-plasma interaction. So-called fast ignition, this process involves a long-discussed possibility of using a hollow cone to help focus laser energy on the pellet core to induce fusion. Unfortunately, these cones appear to fail in that mission.
Cell interact with their surroundings using proteins called integrin, which reside in a cell’s outer plasma membrane. Despite their importance—good and bad—scientists don’t exactly know how integrins work. Scientists have yet to obtain the entire crystal structure of integrin within the plasma membrane, so a computer model of integrin that reveals its molecular dynamics has been developed by Lawrence Berkeley National Laboratory researchers.
Computer simulations of water under extreme pressure are helping geochemists understand how carbon might be recycled from hundreds of miles below the Earth's surface. Carbon compounds are the basis of life, provide most of our fuels and contribute to climate change. The cycling of carbon through the oceans, atmosphere, and shallow crust of the Earth has been intensively studied, but little is known about what happens to carbon deep in the Earth.
Researchers at Lawrence Livermore National Laboratory have recently performed a record number of simulations using all 1,572,864 cores of Sequoia, the largest supercomputer in the world. The simulations are the largest particle-in-cell (PIC) code simulations by number of cores ever performed. PIC simulations are used extensively in plasma physics to model the motion of the charged particles
Mechdyne Corporation has recently announced that it has licensed the CAVE2 hybrid reality environment developed by the Electronic Visualization Laboratory at University of Illinois at Chicago. The licensing agreement was signed in January of 2013, and continues the strong working relationship that began in 1994 when Mechdyne licensed the EVL-designed original CAVE technology.
Researchers at Pompeu Fabra University (Spain) have created a high resolution atlas of the heart with 3D images taken from 138 people. The study demonstrates that an average image of an organ along with its variations can be obtained for the purposes of comparing individual cases and differentiating healthy forms from pathologies.
Researchers have used the 3D simulation capabilities of the supercomputers at the Texas Advanced Computing Center to predict the formation of accretion disks and relativistic jets that warp and bend more than previously thought, shaped both by the extreme gravity of the black hole and by powerful magnetic forces generated by its spin. Their highly detailed models of the black hole environment contribute new knowledge to the field.
Take a walk through a human brain? Fly over the surface of Mars? Computer scientists at the University of Illinois at Chicago are pushing science fiction closer to reality with a wraparound virtual world where a researcher wearing 3D glasses can do all that and more. In the system, known as CAVE2, a 8-foot-high screen encircles the viewer 320 degrees. A panorama of images springs from 72 stereoscopic liquid crystal display panels, conveying a dizzying sense of being able to touch what's not really there.
A Lawrence Livermore National Laboratory team is working to improve lithium-ion battery performance, lifetime, and safety. Working with Lawrence Berkeley National Laboratory, the scientists are developing a new methodology for performing first-principles quantum molecular dynamics simulations at an unprecedented scale to understand key aspects of the chemistry and dynamics in lithium-ion batteries, particularly at interfaces.
Researchers are improving the performance of technologies ranging from medical computed tomography scanners to digital cameras using a system of models to extract specific information from huge collections of data and then reconstructing images like a jigsaw puzzle. The new approach is called model-based iterative reconstruction, or MBIR, and it is helping to greatly reduce the noise in data, providing great clarity at lower radiation intensities.
The National Science Foundation (NSF), along with the journal Science, this week announced the 53 winners and honorable mentions of the International Science & Technology Visualization Challenge, a contest jointly sponsored by NSF and the joournal Science. The winning entries highlight the often stunning capabilities of computer-aided visualization techniques.