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脑电图是诊断脑部疾病的重要而先进的手段,但是其成功依赖于适当的仪器设备。本文基于虚拟仪器的思想和Lab-VIEW平台,提出了一个虚拟脑电图机的设计。论文的重点之一为脑电信号输入通道的设计,这些通道由放大器和滤波器组成,目的是得到消除了噪声的真正的脑电波信号。经过调理的信号由一个具有USB接口的数据采集模块予以数字化并传输给在PC上运行的基于LabVIEW的脑电图软件。在实验室制作的样机实现了脑电信号的采集及其分别在时域和频域进行分析的能力。 相似文献
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俞哲 《Canadian Metallurgical Quarterly》2011,(5)
低碳经济将成为金触危机之后的下一轮经济增长的核心动力,构建低破经济的发展模式,对于落实科学发展观,实现我国可持续发展具有重要意义.本文重点从低碳经济建设实践出发,就如何发展好低碳经济进行探讨研究. 相似文献
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利用等离子体平面阵,依此研究50 MHz-3 GHz电磁波入射等离子体阵面所造成的衰减和反射.研究发现辉光等离子体阵面对人射电磁波具有强吸收弱反射特性.在实验频率范围内,等离子体阵面对电磁波都有一定的吸收作用,吸收值在9.9~25.6 dB之间,但在不同频段也存在着明显的吸收峰值.同时,虽然等离子体阵面对入射电磁波确有... 相似文献
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Rui LIU 《等离子体科学和技术》2019,21(5):54001-13
The oxygen plasma reactor based on dielectric barrier discharge principle can produce a high concentration of reactive oxygen species, which can cooperate with hydraulic cavitation gas–liquid mixer to realize the application of advanced oxidation technology in water treatment. In this technology, the work pressure of the oxygen plasma reactor is decreased by the vacuum suction effect generated in the snap-back section of the gas–liquid mixed container. In this paper, the characteristics of single micro-discharge at different pressures were investigated with the methods of discharge image, electrical characteristics and spectral diagnosis, in order to analyze the electrical characteristics and reactive oxygen species generation efficiency of oxygen plasma reactor at the pressure range from 60 kPa to 100 kPa. The study indicated that, when the pressure decreases, the duty ratio of ionization in the discharge gap and number of electrons with high energy increases, leading to a rise in reactive oxygen species production. When the oxygen reaches the maximum ionization, the concentration of reactive oxygen species is the highest. Then, the discharge intensity continues to increase, producing more heat, which will decompose the ozone and lower the production of reactive oxygen species. The oxygen plasma reactor has an optimum working pressure at different input powers, which makes the oxygen plasma reactor the most efficient in generating reactive oxygen species. 相似文献
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Zhe YU 《等离子体科学和技术》2019,21(5):54004-42
Matching optimization of resonant parameters among the high power inverters, low power transformers and plasma reactors have significant effects on the performance and output of the reactor array when applying the partitioned operation method. In this paper, the Matlab/ Simulink electrical model was established based on the method of partitioned operation. The matching relation between resonant parameters is analyzed on the basis of experimental result. As a consequence, transformer leakage inductance and working frequency are the important parameters influencing the operational efficiency of system, leakage inductance of transformer should be adjusted based on the equivalent capacitance of plasma reactor to realize the matching optimization of resonant parameters. 相似文献