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基于STM32植物动态离子流信号检测系统设计 被引量:2
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作者 张永凯 王晓冬 +2 位作者 周航 赵建平 王成 《计算机测量与控制》 2016年第3期145-148,共4页
溶液中无机盐离子的定向流动会产生微弱的电压信号,通过检测电压信号可以计算离子的浓度、植物根系吸收离子的速度,进而获取植物的生理信息;对植物动态离子流信号检测系统进行设计,采用STM32F103ZET6作为主控芯片,利用极低偏置电流放大... 溶液中无机盐离子的定向流动会产生微弱的电压信号,通过检测电压信号可以计算离子的浓度、植物根系吸收离子的速度,进而获取植物的生理信息;对植物动态离子流信号检测系统进行设计,采用STM32F103ZET6作为主控芯片,利用极低偏置电流放大芯片和高共模抑制比差分放大芯片,给出了信号放大、滤波处理和数据采集电路,对系统噪声来源进行分析,提出了降低噪声的方法,并通过STM32进行A/D转换,把转换数据传输到上位机;该设计实现了植物动态离子流信号的检测,得到了离子在溶液中的流速。 展开更多
关键词 离子流信号 检测系统 STM32F103ZET6 信号放大 A/D转换
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Investigation of Improved Signal Process and Control Circuit for Color-PDP
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作者 邱崧 仇润鹤 +2 位作者 胡文静 张天桥 李煌 《Journal of Donghua University(English Edition)》 EI CAS 2007年第1期94-98,共5页
We present an alternative current-plasma display panel (AC-PDP) signal process and control circuit that fulfills the signal process and transform function. We proposed a novel driving logical waveform generator based ... We present an alternative current-plasma display panel (AC-PDP) signal process and control circuit that fulfills the signal process and transform function. We proposed a novel driving logical waveform generator based on the SCI interface, which can real-time adjust the parameters to optimize performance of the PDP and facilitate the research and test. The use of nesting state-machine and parameterized design not only improves the resource utilization, but also makes it efficient and readable. The design has been written in synthesizable Verilog and fully verified using Xilinx FPGA device and applied in 42-in AC-PDP module. 展开更多
关键词 AC-PDP VERILOG SCI interface FPGA nesting State-Machine.
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Emergence of target waves in neuronal networks due to diverse forcing currents 被引量:4
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作者 MA Jun WANG ChunNi +2 位作者 YING HePing WU Ying CHU RunTong 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2013年第6期1126-1138,共13页
The electric activities of neurons could be changed when ion channel block occurs in the neurons.External forcing currents with diversity are imposed on the regular network of Hodgkin-Huxley(HH) neuron,and target wave... The electric activities of neurons could be changed when ion channel block occurs in the neurons.External forcing currents with diversity are imposed on the regular network of Hodgkin-Huxley(HH) neuron,and target waves are induced to occupy the network.The forcing current I1 is imposed on neurons in a local region with m 0 ×m 0 nodes in the network,neurons in other nodes are imposed with another forcing current I2.Target wave could be developed to occupy the network when the gradient forcing current(I1-I2) exceeds certain threshold,and the formation of target wave is independent of the selection of boundary condition.It is also found that the developed target wave can decrease the negative effect of ion channel block and suppress the spiral wave,and thus channel noise is also considered.The potential mechanism of formation of target wave could be that the gradient forcing current(I1-I2) generates quasi-periodical signal in local area,and the propagation of quasi-periodical signal induces target-like wave due to mutual coupling among neurons in the network. 展开更多
关键词 target wave network of neuron channel block HODGKIN-HUXLEY
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