The atmospheric conditions associated with the unprecedented drought currently afflicting California are "very likely" linked to human-caused climate change, according to Stanford Univ. scientists. The team used a combination of computer simulations and statistical techniques to show that a persistent region of high atmospheric pressure hovering over the Pacific Ocean was likely to form from modern greenhouse gas concentrations.
Certain primordial stars—those between 55,000 and 56,000 times the mass of our sun, or solar masses—may have died unusually. In death, these objects—among the universe’s first-generation of stars—would have exploded as supernovae and burned completely, leaving no remnant black hole behind.
The largest power outage in U.S. history, the 2003 Northeast blackout, began with one power line in Ohio going offline and ended with more than 50 million people without power throughout the Northeast and the Canadian province of Ontario. Despite the apparent failure of the electric grid during such cascading events, blackouts aren’t necessarily grid failures.
When Orlando Rios first started analyzing samples of carbon fibers made from a woody plant polymer known as lignin, he noticed something unusual. The material’s microstructure—a mixture of perfectly spherical nanoscale crystallites distributed within a fibrous matrix—looked almost too good to be true.
On the macroscale, adding fluorine atoms to carbon-based materials makes for water-repellant, non-stick surfaces, such as Teflon. However, on the nanoscale, adding fluorine to graphene vastly increased the friction experienced when sliding against the material. Through a combination of physical experiments and atomistic simulations, a Univ. of Pennsylvania research team has discovered the mechanism behind this surprising finding.
According to a new study, in the unlikely event of a volcanic super-eruption at Yellowstone National Park, the northern Rocky Mountains would be blanketed in meters of ash, and millimeters would be deposited as far away as New York City, Los Angeles and Miami. An improved computer model finds that the hypothetical, large eruption would create a distinctive kind of ash cloud known as an umbrella, which expands evenly in all directions.
For tiny fractions of a second, when illuminated by a laser pulse, quartz glass can take on metallic properties. The phenomenon, recently revealed by large-scale computer simulations, frees electrons, allowing quartz to become opaque and conduct electricity. The effect could be used to build logical switches which are much faster than today’s microelectronics.
Sandia National Laboratories’ Goma 6.0 is software for numerical simulation of multiphysics continuum processes, including moving geometry, phase-change, fluid-structural interactions, complex rheology and chemical reactions. It solves the fundamental equations of mass, momentum, energy and chemical species transport using the finite element method (FEM), which can be described by partial differential equations.
Modeling and simulation is standard practice in nearly every scientific field. Idaho National Laboratory’s Multiphysics Object Oriented Simulation Environment (MOOSE) has transformed approaches to predictive simulation, making it quick, adaptable and more accessible. MOOSE is a computer software that can be loaded onto most UNIX-compliant operating systems including, but not limited to, Mac OS X, Ubuntu, OpenSuSE, Fedora, CentOS and Redhat.
Mapping of the human genome has advanced our understanding of life, health and potential cures for diseases. Many technologies could benefit from genome-level investigations. Now, a disruptive virtual scientific simulation tool that delivers a genome-level investigation for electrolytes is available. Idaho National Laboratory’s Kevin Gering has developed the Advanced Electrolyte Model (AEM), a molecular-based, scientifically proven simulation tool.
With a method known as finite element analysis (FEA), engineers can generate 3-D digital models of large structures to simulate how they’ll fare under stress, vibrations, heat and other real-world conditions. Used for mapping out large-scale structures, these simulations require intensive computation done by powerful computers over many hours, costing engineering firms much time and money.
A flu virus acts like a Trojan horse as it attacks and infects host cells. Scientists at Rice Univ. and Baylor College of Medicine have acquired a clearer view of the well-hidden mechanism involved. Their computer simulations may lead to new strategies to stop influenza, perhaps even a one-size-fits-all vaccine.
For decades, strategic seed collections that help preserve biodiversity have been guided by simple models that offer a one-size-fits-all approach for how many seeds to gather. A new study, however, has found that more careful tailoring of seed collections to specific species and situations is critical to preserving plant diversity. A new approach called simulation-based planning was used to recommend how seeds are saved and reintroduced.
Until now, computer simulations of habitable climates on Earth-like planets have focused on their atmospheres. Mathematicians and earth sciences experts in the U.K. have recently taken the next step, creating a computer-simulated pattern of ocean circulation on a hypothetical ocean-covered Earth-like planet. They hope to learn how different planetary rotation rates would impact heat transport with the presence of oceans taken into account.
A 3-D porous nanostructure would have a balance of strength, toughness and ability to transfer heat that could benefit, nanoelectronics, gas storage and composite materials that perform multiple functions, according to engineers at Rice Univ. The researchers made this prediction by using computer simulations to create a series of 3-D prototypes with boron nitride, a chemical compound made of boron and nitrogen atoms.
Seemingly ordinary, water has quite puzzling behavior. Why, for example, does ice float when most liquids crystallize into dense solids that sink? Using a computer model to explore water as it freezes, a team at Princeton Univ. has found that water's weird behaviors may arise from a sort of split personality: At very cold temperatures and above a certain pressure, water may spontaneously split into two liquid forms.
Certain bonds connecting biological cells get stronger when they’re tugged. Those bonds are known as catch bonds and they’re formed by common adhesion proteins called cadherins. Using computer simulations based on data from previous experiments, researchers in Iowa have answered the question about how these bonds get stronger under force.
A new study of supermassive black holes at the centers of galaxies has found magnetic fields play an impressive role in the systems’ dynamics. In fact, in dozens of black holes surveyed, the magnetic field strength matched the force produced by the black holes’ powerful gravitational pull, says a team of scientists.
Upon introducing engineering simulation into an organization, it’s important to formulate an implementation plan. Simply telling the engineering team to “have at it” doesn’t generally lead to positive results. Every plan will be different, but all can benefit from some basic considerations.
High-speed rail is a frequently discussed topic, but one that has yet to become a reality in the U.S. A number of states and regions in the U.S. including Texas, California, the Pacific Northwest and Minnesota, to name a few, have planned projects to bring high-speed rail to fruition.
If a senior engineer left an organization suddenly, how many hours would it take for the engineering team to take over his projects, confident that they understand not only the designs, but why those designs are the way they are? The typical answer is “far too many”. Widespread use of CAE and data management tools have made this task much easier than before, but these tools do little to record the thinking behind the results.
Imagine a tower that builds itself into the desired structure only by choosing the appropriate bricks. Absurd, but in the nano world self-assembly is now a common practice for forming structures. Researchers in Austria have been investigating how they can control the ordering of self-assembling structures and discovered how to switch the assembly process on and off.
A treatment for dry eye, a burning, gritty condition that can impair vision and damage the cornea, could someday result from computer simulations that map the way tears move across the surface of the eye. To understand dry eye, the team had to begin with the physics and chemistry of tears.
Commercial buildings could cut their heating and cooling electricity use by an average of 57% with advanced energy-efficiency controls, according to a year-long trial of the controls at malls, grocery stores and other buildings across the country. The study demonstrated higher energy savings than what was predicted in earlier computer simulations by the same researchers.
Simulations in statistical physics are typically restricted to systems under 100,000 particles, many times smaller than the actual material quantities used in typical experiments. Finite-size corrections can adjust the results to the macroscopic scale. A team of researchers in Germany has now succeeded in better understanding how this technique works when it is used to assess interfacial tension, thus enabling more accurate predictions.