A new study set out to use numerical simulations to validate previous theoretical predictions describing materials exhibiting so-called antiferromagneting characteristics. A recently discovered theory shows that the ordering temperature depends on two factors—namely the spin-wave velocity and the staggered magnetization. The simulations match these theoretical predictions.
The universe is a vast and mysterious place, but thanks to high-performance computing technology scientists around the world are beginning to understand it better. They are using supercomputers to simulate how the Big Bang generated the seeds that led to the formation of galaxies such as the Milky Way.
Enhanced growth of Earth's leafy greens during the 20th century has significantly slowed the planet's transition to being red-hot, according to the first study to specify the extent to which plants have prevented climate change since pre-industrial times. Researchers have found that land ecosystems have kept the planet cooler by absorbing billions of tons of carbon, especially during the past 60 years.
Multiphysics software developer COMSOL is holding its COMSOL Conference Oct. 9-11 at the Boston Marriott Newton. The event will draw together engineers, scientists and researchers to learn from the leaders in multiphysics simulation and discover the latest tools from COMSOL.
Researchers are using computer simulations to investigate how ultrasound and tiny bubbles injected into the bloodstream might break up blood clots, limiting the damage caused by a stroke in its first hours. Strokes are the most common cause of long-term disability in the U.S. and the third most common cause of death.
To get a better understanding of the subatomic soup that filled the early universe, and how it “froze out” to form the atoms of today’s world, scientists are taking a closer look at the nuclear phase diagram. Like a map that describes how the physical state of water morphs from solid ice to liquid to steam with changes in temperature and pressure, the nuclear phase diagram maps out different phases of the components of atomic nuclei.
Just as wind turbines tap into the energy of flowing air to generate electricity, hydrokinetic devices produce power from moving masses of water. Engineers in Spain have performed a computer simulation to determine the optimal configuration of a system produced by a Norwegian company to enable it to extract the maximum amount of energy from any given current.
The amazingly efficient lungs of birds and the swim bladders of fish have become the inspiration for a new filtering system to remove carbon dioxide from electric power station smokestacks before the main greenhouse gas can billow into the atmosphere and contribute to global climate change. A report on the new technology was presented Monday at the 246th National Meeting & Exposition of the American Chemical Society.
Electronic devices with touchscreens rely on transparent conductors made of indium tin oxide, or ITO. But cost and the physical limitations of this material are limiting progress in developing flexible touchscreens. A research collaboration between the Univ. of Pennsylvania and Duke Univ. is exploring the use of nanowires to replace ITO, and are using simulation tools to determine how they might work.
Researchers at Rice Univ. and the Univ. of Texas MD Anderson Cancer Center have received a $1.3 million grant from the National Institutes of Health to create processes that will look more deeply than ever into the protein networks that drive cells. The four-year grant will enable a collaboration on new ways to see and evaluate the mechanisms that give cells their shapes and prompt them to change and move.
Computer simulations conducted at Lawrence Berkeley National Laboratory could help scientists make sense of a recently observed and puzzling wrinkle in one of nature’s most important chemical processes. It turns out that calcium carbonate may momentarily exist in liquid form as it crystallizes from solution.
The evolution of fluid drops deposited on solid substrates has been a focus of large research effort for decades, and most recently it has focused on nanoscale properties. Two New Jersey Institute of Technology researchers are the first to demonstrate that simulations based on continuum fluid mechanics can explain the nanoscale dynamics of liquid metal particles on a substrate.
A recent study in the U.K. investigated the electrical conductivity of a solid electrolyte, a system of positive and negative atoms on a crystal lattice. Computer simulations performed using this model have revealed how the electrical conductivity of many materials increases with a strong electrical field in a universal way. The discovery could significant implications for future materials and chemistry research.
A new facility at Idaho National Laboratory is helping nuclear power plant operators like Duke Energy embark on an upgrade projects for their control rooms. The new Human System Simulation Laboratory (HSSL) is a full-scale virtual nuclear control room that can test the safety and reliability of proposed technology replacements before they are implemented in commercial nuclear control rooms.
One of the major driving forces for developing new sensors and detectors is in medical applications. This includes the integration of fiber optic sensors, smart sensors, silicon micromachined sensors and thin-film devices. Smart sensors are devices that incorporate electronic logic, control or signal processing functions and therefore offer enhanced measurement capabilities, information quality and functional performance.
Wall turbulence develops when fluids—liquid or gas—flow past solid surfaces at anything but the slowest flow rates. Progress in understanding and controlling wall turbulence has been somewhat incremental because of the massive range of scales of motion involved, but recently engineers in the U.S. and the U.K. have developed a new and improved way of looking at the composition of turbulence near walls.
Nanoscientists who recently created beautiful, tiled patterns with flat nanocrystals faced a mystery: Why did crystals arrange themselves in an alternating, herringbone style, even though it wasn’t the simplest pattern? Help from computer simulations have given them a new tool for controlling how objects one-millionth the size of a grain of sand arrange themselves into useful materials.
The Powerwall Theater (PWT) at Los Alamos National Laboratory is an innovative facility that enables researchers to view the complex models and simulations they have created using some of the world’s fastest supercomputers. Recently, PWT was upgraded with 40 double-stacked Christie Mirage 3-D LED projectors that will provide seamless, integrated 3-D visualization.
Taking advantage of the power of cloud computing, researchers have simulated almost every important configuration of cloth. Though computing all the ways cloth can move would be impossible, the 4,554 CPU hours and 33 GB of data generated represents an ambitious effort to improve graphics for next-generation computer games.
Random lasers are tiny structures emitting light irregularly into different directions, giving them a unique signature, like a fingerprint. Scientists in Austria have now shown that these exotic light sources, which differ greatly from conventional mirrored lasers, can be accurately controlled.
The Ranger supercomputer in Texas has recently been used to determine how to sculpt fluid flows by precisely placing tiny pillars in microfluidic channels. By altering fluid speed and stacking pillars, a wide arrays of controlled flows can be achieved. This could be a boon for clinicians who would like to separate white blood cells in a sample, or more quickly perform lab-on-a-chip-type operations.
The Consortium for Advanced Simulation of Light Water Reactors (CASL) announced that its scientists have successfully completed the first full-scale simulation of an operating nuclear reactor. CASL is modeling nuclear reactors on supercomputers to help researchers better understand reactor performance, with the goal of ultimately increasing power output, extending reactor life and reducing waste.
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.