671 research outputs found
Charge Transfer Processes in Collisions of Ground State C+ Ions with H2, D2, CO and CO2 Molecules in the Energy Range from 0.15 keV to 4.5 keV
Distribution of the magnetization reversal duration in sub-ns spin-transfer switching
We study the distribution of switching times in spin-transfer switching
induced by sub-ns current pulses in pillar-shaped spin-valves. The pulse
durations leading to switching follow a comb-like distribution, multiply-peaked
at a few most probable, regularly spaced switching durations. These durations
reflect the precessional nature of the switching, which occurs through a
fluctuating integer number of precession cycles. This can be modeled
considering the thermal variance of the initial magnetization orientations and
the occurrence of vanishing total torque in the possible magnetization
trajectories. Biasing the spin-valve with a hard axis field prevents some of
these occurrences, and can provide an almost perfect reproducibility of the
switching duration.Comment: submitted to PR
Study of the Proton Single-Particle Strengths in 19F and Proton Shell Closure of 18O through the 18O(d, n)19F Reaction
開始ページ、終了ページ: 冊子体のページ付
Induced sensorimotor brain plasticity controls pain in phantom limb patients
The cause of pain in a phantom limb after partial or complete deafferentation is an important problem. A popular but increasingly controversial theory is that it results from maladaptive reorganization of the sensorimotor cortex, suggesting that experimental induction of further reorganization should affect the pain, especially if it results in functional restoration. Here we use a brain-machine interface (BMI) based on real-time magnetoencephalography signals to reconstruct affected hand movements with a robotic hand. BMI training induces significant plasticity in the sensorimotor cortex, manifested as improved discriminability of movement information and enhanced prosthetic control. Contrary to our expectation that functional restoration would reduce pain, the BMI training with the phantom hand intensifies the pain. In contrast, BMI training designed to dissociate the prosthetic and phantom hands actually reduces pain. These results reveal a functional relevance between sensorimotor cortical plasticity and pain, and may provide a novel treatment with BMI neurofeedback.This research was conducted under the ‘Development of BMI Technologies for Clinical Application’ of SRPBS by MEXT and AMED. This research was also supported in part by JST PRESTO; JSPS KAKENHI JP24700419, JP26560467, JP22700435, JP26242088, JP26282165, JP15H05710 and JP15H05920; Brain/MINDS and SICP from AMED; ImPACT; Ministry of Health, Labor, and Welfare (18261201); and the Japan Foundation of Aging and Health
Search for H hypernucleus by the Li reaction at = 1.2 GeV/
We have carried out an experiment to search for a neutron-rich hypernucleus,
H, by the Li() reaction at =1.2
GeV/. The obtained missing mass spectrum with an estimated energy resolution
of 3.2 MeV (FWHM) showed no peak structure corresponding to the H
hypernucleus neither below nor above the H particle decay
threshold. An upper limit of the production cross section for the bound
H hypernucleus was estimated to be 1.2 nb/sr at 90% confidence
level.Comment: 6 pages, 5 figures, published versio
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