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.
Volcanoes are well known for cooling the climate. But just how much and when has been a bone of contention among historians, glaciologists, and archeologists. Now a team of atmosphere chemists, from the Tokyo Institute of Technology and the University of Copenhagen, has come up with a way to say for sure which historic episodes of global cooling were caused by volcanic eruptions.
Maplesoft this week announced that its ongoing partnership with Toyota Motor Engineering & Manufacturing North America, Inc. has been expanded to include the use of new symbolic computation methods in control systems engineering. The new research will allow developers to consider system nonlinearities, modeling inaccuracies, and parametric uncertainties in the design process, helping Toyota shorten development time while maintaining high quality results.
Thermoelectric efficiency has improved enough to enable limited commercial use, but lack of better materials has prevented widespread adoption. New development work at Massachusetts Institute of Technology could help reduce thermal conductivity while keeping electrical conductivity high. In addition to computer modeling, the researchers draw upon methods developed by optics researchers who have been attempting to create invisibility cloaks—ways of making objects invisible to certain radio waves or light waves using nanostructured materials that bend light.
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.
In a paper published this week’s Nature Methods, Salk Instititute researchers share a how-to secret for biologists: code for Amazon Cloud that significantly reduces the time necessary to process data-intensive microscopic images. The method promises to speed research into the underlying causes of disease by making single-molecule microscopy of practical use for more laboratories.
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.
Lawrence Livermore National Laboratory researchers have developed a new simulation capability to model a classic plasma configuration. The researchers demonstrated, for the first time, a fully kinetic model of the dense plasma focus (DPF) Z-pinch device, including the electrodes, in a realistic geometry.
Heat rising up from cities such as New York, Paris and Tokyo might be remotely warming up winters far away in some rural parts of Alaska, Canada, and Siberia, a new study theorizes. In an unusual twist revealed by computer modeling, that same urban heat from buildings and cars may be slightly cooling the autumns in much of the Western United States, Eastern Europe, and the Mediterranean. The finding stems from the ability of “heat island” energy to change high-altitude currents.
Marking the culmination of over 10 years of investigation by scientists to show—in vivo—that complex four-stranded structures exist in the human genome alongside Watson and Crick’s famous double helix, researchers in the U.K. have recently published a paper that goes on to show clear links between concentrations of four-stranded quadruplexes and the process of DNA replication, which is pivotal to cell division and production.
Our eyes may be our window to the world, but how do we make sense of the thousands of images that flood our retinas each day? Scientists at the University of California, Berkeley, have found that the brain is wired to put in order all the categories of objects and actions that we see. They have created the first interactive map of how the brain organizes these groupings.
Researchers at the University of California, San Diego School of Medicine and colleagues have proposed a new method that creates an ontology, or a specification of all the major players in the cell and the relationships between them. This computational model of the cell is made from large networks of gene and protein interactions, and is created automatically from large datasets, helping researchers see potentially new biological components.
A new NASA-funded prototype system developed by the National Center for Atmospheric Research now is providing weather forecasts that can help flights avoid major storms as they travel over remote ocean regions. The eight-hour forecasts of potentially dangerous atmospheric conditions are designed for pilots, air traffic controllers and others involved in transoceanic flights.
Understanding the arrangement of atoms in a solid is vital to materials research—but the problem can be difficult to solve in many important situations. Now, by combining the work of two different scientific camps, Northwestern University researchers have created an algorithm that makes crystal structure solution more automated and reliable.
Because of the limited image spatial-resolution of even today's best-quality laptop and desktop computers, researchers and physicians often can’t see phenomena that are too large, too small, too complex, or too distant. CAVE2, a next-generation, large-scale virtual environment, combines the benefits of scalable-resolution display walls with virtual-reality system to create a revealing and seamless 2D and 3D environment that is becoming increasingly important in scientific discovery.
According to new research by the University of Delaware, renewable energy could fully power a large electric grid 99.9% of the time by 2030 at costs comparable to today’s electricity expenses. The study’s authors developed a computer model to consider 28 billion combinations of renewable energy sources and storage mechanisms, each tested over four years of historical hourly weather data and electricity demands.
Using a new method for estimating greenhouse gases that combines atmospheric measurements with model predictions, Lawrence Berkeley National Laboratory researchers have found that the level of nitrous oxide, a potent greenhouse gas, in California may be 2.5 to 3 times greater than the current inventory. At that level, total nitrous oxide emissions would account for about 8% of California's total greenhouse gas emissions.
A collaboration of several government and academic research organizations are hard at work on a design and manufacturing concept called “model-based design and verification”. Instead of building prototypes and discarding them, manufacturers would conduct virtually all of the design, testing, error identification, and revisions on a computer up to the point of commercial production.
Over the course of two weeks this fall, computer models made a startling sequence of correct and useful predictions. By running thousands of simulations on polling data, Nate Silver correctly forecasted how all 50 states would vote for president. In the case of Hurricane Sandy, meteorologists identified the potential danger to the Northeast nearly a week before the storm arrived. Computer models of many kinds have improved in recent years, and the approach is finding new, unexpected uses.
Opsins, the light-sensitive proteins key to vision, may have evolved earlier and undergone fewer genetic changes than previously believed, according to a new study that used computer modelling to theorize the evolutionary developments of these structures. The analysis incorporated all available genomic information from all relevant animal lineages.
By tailoring geoengineering efforts by region and by need, a new model promises to maximize the effectiveness of solar radiation management while mitigating its potential side effects and risks. The study explores the feasibility of using solar geoengineering to counter the loss of Arctic sea ice.
To combat the effects of climate change, some scientists have proposed temporarily reducing the amount of sunlight reaching the earth. These various geoengineering schemes have typically thought as a standalone fix, but a new computer analysis of future climate change considers emissions reductions together with sunlight reduction. The model shows that such drastic steps to cool the earth would only be necessary in certain scenarios.
Ask adults what number is halfway between 1 and 9, and most will say 5. But pose the same question to small children and they're likely to answer 3. Cognitive scientists theorize that that's because it's actually more natural for humans to think logarithmically than linearly. A new information-theoretical model of human sensory perception and memory sheds light on these peculiarities of the nervous system.
Researchers from North Carolina State University have developed a new technique that allows users to better determine the amount of charge remaining in a battery in real time. Using the researchers' new technique, models are able to estimate remaining charge within 5%.
Using a computational model they designed to incorporate detailed information about plants' interconnected metabolic processes, scientists at Brookhaven National Laboratory have identified key pathways that appear to "favor" the production of either oils or proteins. The research may point the way to new strategies to tip the balance and increase plant oil production.