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Osman Allen; Albert Robert; Ridderinkhof K. Richard; Band Guido; van der Molen Maurits 《Canadian Metallurgical Quarterly》2006,32(4):986
A frequency analysis was used to tag cortical activity from imagined rhythmic movements. Participants synchronized overt and imagined taps with brief visual stimuli presented at a constant rate, alternating between left and right index fingers. Brain potentials were recorded from across the scalp and topographic maps made of their power at the alternation frequency between left and right taps. Two prominent power foci occurred in each hemisphere for both overt and imagined taps, one over sensorimotor cortex and the other over posterior parietal cortex, with homologous foci in opposite hemispheres arising from oscillations 180° out of phase. These findings demonstrate temporal isomorphism at a neural level between overt and imagined movements and illustrate a new approach to studying covert actions. (PsycINFO Database Record (c) 2011 APA, all rights reserved) 相似文献
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交错BCH码在移动窄带图像信道中的性能研究 总被引:2,自引:0,他引:2
文章在详述BCH码编译码过程的基础上,对交错BCH码在移动瞧道压缩图像传输系统中的应用进行了计算机仿真,直观地显示出产错BCH码在窄带图像传输系统中的优良性能,并为移动图像传输中码型的选用提供参考。 相似文献
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J.S. Brown C.W. Band E.C. Finch R.A. Holt H.A. Klein J. Laursen A.F. McClelland N.J. Peacock J.D. Silver M.F. Stamp J. Takacs 《Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms》1985,9(4):682-685
This work describes the application of the technique of photographic VUV spectroscopy to accurate measurement of the wavelength of the theoretically interesting 1s2s 3S1-1s2p 3P2 transition in helium-like Ne8+ in a recoil ion source. Good resolution is obtained, and a preliminary value of 124.815±0.002 nm is found for the wavelength. 相似文献
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Lead magnesium niobate (PMN) based binary with lead titanate (PT), lead iron niobate (PFN) and lead zinc niobate (PZN) and
ternary with PZN-PT and PFN-PT solid solutions have been synthesized. In depth characterization using X-ray diffraction and
SEM techniques have revealed the major perovskite phase formation. Amongst all the solid solutions, PMN-PZN-PT has given the
highest values of permittivity as 19,740 and 23,700 withT
c as 34°C when sintered at 1080°C and 1180°C respectively on the one hand and on the other, PFN containing solid solutions
exhibited distinct deviation from the relaxor behaviour. 相似文献
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Spectrophotometric data followed by a suitable treatment of chemometric analysis were used for the simultaneous determination of monosodium glutamate (MSG), guanosine 5′-monophosphate (GMP) and inosine 5′-monophosphate (IMP) in stock cube samples, without any previous extraction step. By this way, the overlapping of the absorption spectra was resolved using a PLS-1 model. The concentration for experimental calibration matrix were varied between 5.03–34.2 μg mL−1 for IMP and GMP, and 448–1399 μg mL−1 for MSG. The relative errors of prediction (REPCV %) were 1.8, 2.8 and 3.1 for IMP, GMP and MSG, respectively. 相似文献
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Natalia E. Llamas María S. Di Nezio Miriam E. Palomeque Beatriz S. Fernández Band 《Food Analytical Methods》2008,1(1):43-48
A simple and rapid analytical procedure for determination of saccharin (SAC) and acesulfame-K (AC-K) based on UV-vis measurements
and partial least squares (PLS) was proposed. Thus, an experimental design at levels 2 and 15 mg l−1 for SAC and 2 and 20 mg l−1 for AC-K was applied. Because real samples usually contain SAC and AC-K combined with aspartame (ASP), this interference
was also included in the model. The procedure was successfully applied for SAC and AC-K simultaneous determination in sweeteners
and fruit juice powders, without any separation step to remove ASP. The results were validated by using spiked samples, and
the obtained recoveries were satisfactory. 相似文献