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How Computers Push on the Molecules They Simulate

By Guest PostJanuary 9, 2013Scienceacceleration, albert einstein, algorithm, analytical results, artifacts, atoms and molecules, behavior, Berkeley, berkeley lab, calculation, california, california institute, chemical fuel, collide, computer method, conserve energy, david sivak, digital representation, digitize time, dna repair, driving force, effective friction, energy dense, equation, error, finite time steps, fluid, french physicist, gavin crooks, john chodera, langevin dynamics, model brownian motion, modeling molecular system, modern computer, molecular machines, molecular scale motion, molecule, momentum, natural system, nonequilibrium driving force, nonequilibrium statistical mechanics, particle, passage of time, paul langevin, photosynthesis, pollen grain, qb3, quantitative biosciences, quantum mechanics, real world, simulation, source, tenacious errors, theoretical method, thermal energy, toy models, university, velocity, water, water molecules

Berkeley Lab bioscientists and their colleagues decipher a far-reaching problem in computer simulations

Because modern computers have to depict the real world with digital representations of numbers instead of physical analogues, to simulate the continuous passage of time they have to digitize time into small slices. This kind of simulation is essential in disciplines from medical and biological research, to new materials, to fundamental considerations of quantum mechanics, and the fact that it inevitably introduces errors is an ongoing problem for scientists.

Scientists at the U.S. Department of Energy’s Lawrence Berkeley National Laboratory (Berkeley Lab) have now identified and characterized the source of tenacious errors and come up with a way to separate the realistic aspects of a simulation from the artifacts of the computer method. The research was done by David Sivak and his advisor Gavin Crooks in Berkeley Lab’s Physical Biosciences Division and John Chodera, a colleague at the California Institute of Quantitative Biosciences (QB3) at the University of California at Berkeley. The three report their results in Physical Review X. (more…)

Exercise May Lead to Better School Performance for Kids with ADHD

By Guest PostOctober 17, 2012Health, Scienceadhd, american children, attention, brain activity, cartoon fish, challenge, charles hillman, children, computer game, daniel picchietti, deficit, disorder, eeg cap, error, exercise, hyperactivity, inhibitory control, journal, kids, matthew pontifex, michigan, mistake, nonpharmaceutical treatment, pediatrics, physical activity, physical education, program, state university, swimming, treadmill, walking briskly

EAST LANSING, Mich. — A few minutes of exercise can help children with attention deficit hyperactivity disorder perform better academically, according to a new study led by a Michigan State University researcher.

The study, published in the current issue of the Journal of Pediatrics, shows for the first time that kids with ADHD can better drown out distractions and focus on a task after a single bout of exercise. Scientists say such “inhibitory control” is the main challenge faced by people with the disorder. (more…)

Fluid Cathedrals: Gels Under the Microscope

By Guest PostOctober 8, 2012Science3d maps, bandage, basilica, cables, computer simulation, correlation, di, discovery, dollop, engineering researcher, error, florence, flow, fluid, geodesic dome, hair gel, high tech, labyrinth, lilian hsiao, manufacturer, michael solomon, michigan, particle, pedestrian, pressure, railroad bridge, richmond newman, rigid structure, rods, roof, santa croce, sharon glotzer, tensegrity, trial

ANN ARBOR— A dollop of hair gel might not look like much, but Michigan Engineering researchers have found that it’s a labyrinth of chambers and domes, constructed by the particles inside. These structures allow the gel to hold its shape and determine how much pressure it can withstand before it starts to flow.

While manufacturers currently use trial and error to develop gels with a particular degree of solidity, this discovery could provide a way to design gels for particular applications. (more…)

Anxious Women’s Brains Work Harder

By Guest PostJune 14, 2012Healthanxiety disorders, anxious girls, anxious women, brain activity, brain games, brain response, brains, danielle taylor, dopamine, error, estrogen, front part, hormone, hormone differences, identification, jason moser, mental health, neurotransmitter, puzzle, sex, tim p moran, treatment, worrisome female

EAST LANSING, Mich. — In a discovery that could help in the identification and treatment of anxiety disorders, Michigan State University scientists say the brains of anxious women work much harder than those of men.

The finding stems from an experiment in which college students performed a relatively simple task while their brain activity was measured by an electrode cap. Only women who identified themselves as particularly anxious or big worriers recorded high brain activity when they made mistakes during the task.

Jason Moser, lead investigator on the project, said the findings may ultimately help mental health professionals determine which girls may be prone to anxiety problems such as obsessive compulsive disorder or generalized anxiety disorder. (more…)

Tag Archives: error

How Computers Push on the Molecules They Simulate

Exercise May Lead to Better School Performance for Kids with ADHD

Fluid Cathedrals: Gels Under the Microscope

Anxious Women’s Brains Work Harder