基于LabVIEW的潜油电泵软启动与保护系统设计

提出基于Lab VIEW平台的潜油电泵软启动与保护系统,利用NI公司的Singleboard-Rio9606和NI9683对软启动过程中的电压及电流等参量的变化进行实时采集,将检测结果通过串口RS-232上传到液晶屏上显示出来,通过液晶屏设定系统保护阈值,当系统发生过压、欠压、过流及断相等故障时,立即停机并将故障原因显示在液晶屏上。实验表明:基于Lab VIEW的潜油电泵软启动与保护系统能实现电泵电压从零无极软启动和实时保护,达到预期的设计效果。     

基于LabVIEW的潜油电机电流采集和数据存储研究

以Lab VIEW图形编程软件为开发平台,结合USB-6008数据采集板卡与交流侧三相电流监测和调理电路作为硬件平台,实现电流信号的采集和数据的保存。实验结果表明:系统模块便于操作,运行稳定,达到了实时、准确监测电机运行状态的目的。     

回转窑倾斜度无线测量仪的设计

针对回转窑的轮带与托轮及大齿圈与传动齿轮之间倾斜度的动态检测需要,设计一种旋转体倾斜度无线测量仪。该仪器主要包括以倾角传感器SCA103T-D04、A/D芯片ADS7606和单片机MSP43F149为核心的硬件电路和PC笔记本电脑。其中通过C语言和Lab VIEW软件编写下位机和上位机的程序。SCA103T-D04有内部温度传感器,通过温度补偿算法提高测量精度。实验结果显示,该仪器倾角测量精度为0.02°。     

基于msp430单片机的两线制智能pH转换器设计

采用微功耗电路、高阻抗输入及AD7705+MSP430+ AD421数字处理框架,开发出一款性能较好的两线制智能pH转换器.通过清晰的软件结构,实现了完整的数据处理和菜单嵌套.     

粗糙表面微通道电渗流的数值模拟

电渗流（EOF）广泛应用于微流控芯片中的流体的传输与混合。针对带有粗糙表面的平行板微通道,建立了描述EOF的控制方程,基于有限元分析方法对具有不同粗糙度和EDL厚度的微通道内的EOF进行了数值模拟。结果表明,当EDL厚度接近0.3倍粗糙度大小时,粗糙度对EDL的影响较大,EOF受到粗糙度的阻力作用较为明显,而当EDL厚度相对粗糙度较大和较小时,EOF速度受到粗糙度的影响相对较小;粗糙表面微通道中部EOF速度与相对EDL厚度的关系呈“V”型曲线,EOF平均速度呈“L”型曲线。研究结论对于微通道表面的优化设计以及微流控芯片中流体的精确操控具有一定的参考意义。     

基于Lab VIEW环境下的可移植数据采集系统

以Lab VIEW图形化编程软件为开发平台,结合BNC2120接线端子盒与NI PCI-6024E数据采集卡设计快速有效、多功能可移植性数据采集系统.     

基于小波变换的旋转机械振动测试系统

介绍了一种基于小波变换的旋转机械振动测试系统的设计方案,该系统不但可以对振动信号进行快速傅里叶变换实现频谱分析,而且还能够通过Lab VIEW对Matlab Script节点的调用实现小波变换,弥补了频谱分析中缺少时间信息的不足;与传统的机械故障诊断系统相比,该系统的处理分析功能更加强大,而且更容易操作。     

基于LabVIEW的PID自整定控制器设计

利用Lab VIEW提供的友好人机图形交互界面和功能强大的数据采集处理、运算功能,实现了基于继电反馈的PID控制器。通过仿真和实时控制实验证实:利用Lab VIEW平台可以很好地实现基于继电反馈的PID自整定控制策略。     

基于虚拟仪器和MSP430单片机的数据采集系统的开发

利用虚拟仪器技术和MSP430F149单片机丰富的片内资源,开发了一种数据采集系统.以MSP430F149单片机为核心设计了系统的数据采集模块、存储模块、串行通讯模块以及电源模块;在定义上下位机间通讯协议的基础上.采用LabVIEW对系统的上位机软件进行了开发;结合MSP430F149单片机的ADC12模块和USART...     

基于Lab VIEW平台的标准实验室环境实时监测系统研究

基于虚拟仪器技术设计的标准实验室环境实时监控系统,重点着眼于监测标准实验室环境内的温度和空气湿度。设计开发的监控系统以Lab VIEW为开发平台,实现对标准实验室内温度、湿度信息的采集、超限报警,访问数据库,实现数据的存储、查询及输出,以保持实验室最优环境。     

Many Drugs of Abuse May Be Acutely Transformed to Dopamine,Norepinephrine and Epinephrine In Vivo

It is well established that a wide range of drugs of abuse acutely boost the signaling of the sympathetic nervous system and the hypothalamic–pituitary–adrenal (HPA) axis, where norepinephrine and epinephrine are major output molecules. This stimulatory effect is accompanied by such symptoms as elevated heart rate and blood pressure, more rapid breathing, increased body temperature and sweating, and pupillary dilation, as well as the intoxicating or euphoric subjective properties of the drug. While many drugs of abuse are thought to achieve their intoxicating effects by modulating the monoaminergic neurotransmitter systems (i.e., serotonin, norepinephrine, dopamine) by binding to these receptors or otherwise affecting their synaptic signaling, this paper puts forth the hypothesis that many of these drugs are actually acutely converted to catecholamines (dopamine, norepinephrine, epinephrine) in vivo, in addition to transformation to their known metabolites. In this manner, a range of stimulants, opioids, and psychedelics (as well as alcohol) may partially achieve their intoxicating properties, as well as side effects, due to this putative transformation to catecholamines. If this hypothesis is correct, it would alter our understanding of the basic biosynthetic pathways for generating these important signaling molecules, while also modifying our view of the neural substrates underlying substance abuse and dependence, including psychological stress-induced relapse. Importantly, there is a direct way to test the overarching hypothesis: administer (either centrally or peripherally) stable isotope versions of these drugs to model organisms such as rodents (or even to humans) and then use liquid chromatography-mass spectrometry to determine if the labeled drug is converted to labeled catecholamines in brain, blood plasma, or urine samples.     

Sapindaceae,cyanolipids, and bugs

Scentless plant bugs (Heteroptera: Rhopalidae) are so named because adults of the Serinethinae have vestigial metathoracic scent glands. Serinethines are seed predators of Sapindales, especially Sapindaceae that produce toxic cyanolipids. In two serinethine species whose ranges extend into the southern United States,Jadera haematoloma andJ. sanguinolenta, sequestration of host cyanolipids as glucosides renders these gregarious, aposematic insects unpalatable to a variety of predators. The blood glucoside profile and cyanogenesis ofJadera varies depending on the cyanolipid chemistry of hosts, and adults and larvae fed golden rain tree seeds (Koelreuteria paniculata) excrete the volatile lactone, 4-methyl-2(5H)-furanone, to which they are attracted.Jadera fed balloon vine seeds (Cardiospermum spp.) do not excrete the attractive lactone. Loss of the usual heteropteran defensive glands in serinethines may have coevolved with host specificity on toxic plants, and the orientation ofJadera to a volatile excretory product could be an adaptive response to save time.Mention of a commercial product does not consititute an endorsement by the USDA.     

Insect antifeedant properties of anthranoids from the genusVismia

Vismiones and ferruginins, representatives of a new class of lypophilic anthranoids from the genusVismia were found to inhibit feeding in larvae of species ofSpodoptera, Heliothis, and inLocusta migratoria.     

2008～2009年世界塑料工业进展

收集了2008年7月～2009年6月世界塑料工业的相关资料,介绍了2008～2009年国外塑料工业的发展情况,提供了世界塑料产量、消费量及全球各类树脂的需求量及产能情况。按通用热塑性树脂(聚乙烯、聚丙烯、聚苯乙烯、聚氯乙烯、ABS树脂)、工程塑料(尼龙、聚碳酸酯、聚甲醛、热塑性聚酯、聚苯醚)、特种工程塑料(聚苯硫醚、液晶聚合物、聚醚醚酮)、通用热固性树脂(酚醛、聚氨酯、环氧树脂、不饱和聚酯树脂)不同品种的顺序,对树脂的产量、消费量、供需状况及合成工艺、产品应用开发、树脂品种的延伸及应用的进一步扩展等技术作了详细介绍。     

ICP-MS法测定地球化学样品中As、Cr、Ge、V等18种微量痕量元素的研究

建立了测定地球化学样品中包括As、Cr、Ge、V等18种微量、痕量元素的ICP-MS方法。地化试样用HF-HNO3混酸分解后,以1 1 HNO3溶解干渣。由于制样不使用盐酸,避免了Cl对As、Cr、Ge、V的质谱干扰。用国家一级地球化学标准物质GBW 07309制备溶液优化仪器工作参数,并用于校准。方法测定限(6s)为:0.007~6.4μg/g,精密度(RSD%,n=12)为:29%~9.4%,经过国家一级地球化学标准物质的分析验证,结果与标准值吻合。方法已应用于国土资源调查的试样分析。