New Design of Pre-amplification Circuit for EEG Signals

In the measurement of EEG signals ,the pre - amplification electrical signal of brain is the most importantant and key link. Whether the design is excellent or inferior is related to the electrical signal detection system of brain directly. The design of this circuit has been paid attention to by domestic and international expert all the time. On the basis of existing biological electricity amplifier which is studied, the authors consult the electric amplifier circuit of living beings designed , such as reference , improve and design a new-type and high performance electrical signal characteristic of brain in . The circuit has prevented the traditional design from enlarging the miscellaneous simulation of the circuit and straining the wave link, otherwise, this circuit is of simple structure , low cost, and convenient debugging. The paper has detailed theoritic analysis and experimental results to prove this circuit, which offered a new train of thought for reseach and development of brain electrical amplifier and other faint biological electricity amplifiers . This curcuit has be expected to win extensive application.     

数字化电机调速系统中神经元控制器的应用

神经网络具有自学习、自适应能力，用于控制时可不依赖控制对象的数学模型。为此，基于单神经元设计出用于交流电机矢量控制的自适应磁链和转速控制器，并应用于由数字信号处理器(DSP)实现的交流电机矢量控制系统中，实验表明：此方法设计的控制器结构简单，易于数字化实现，控制系统动态性能良好。     

喷雾机器人远程控制系统的设计与试验研究

结合喷雾机器人作业环境的要求,开发出基于客户端/服务器模式的远程控制平台.该平台实现了通过无线网络实时传输各类数据和控制命令,客户端再现了机器人的工作环境和状态.在此基础上进行了系统性能测试和轨迹测试.试验结果表明:为了保证良好的操控性,机器人所处区域信号强度必须大于30%,操作者根据反馈信息判断机器人是否偏离预定路径,并在偏离时给予有效的纠正,为解决喷雾机器人重喷、漏喷的问题提供了一种方法.     

城市交叉口公交优先信号协调模式探讨

对混合交通条件下基本车道饱和流量的各影响因素进行了分析,对比基本车道饱和流量影响因素修正方法,给出了基本车道饱和流量及各类车道通用校正系数常用计算方法。分析了公交车在连线上的运行特性,基于单点定时式公交优先信号配时模型,以人均延误最小为目标,建立了定时式两相邻交叉口公交优先信号协调配时模型;基于以人总延误最小为目标建立了定周期两相邻交叉口公交优先信号协调配时模型。利用实际调查数据,采用仿真分析方法验证本文提出的混合交通条件下定时式两相邻交叉口公交优先信号协调配时模型的正确性。     

泵用异步电动机直接转矩控制系统的设计

直接转矩控制（DTC）是一种高性能的控制方法，提出了一种基于TMS320C32的直接转矩控制系统实现方案。通过硬和软件设计，实现对异步电动机的直接转矩控制，实验结果表明了该方案的可行性，将其应用于水泵的调速系统中，能进一步提高水泵的运行效率。     

滚珠丝杠的温升及热变形对策

对滚珠丝杠的温升及热变形的对策进行了探讨,提出解决温升和热变形的方法,为滚珠丝杠的设计、安装、使用和维修提供参考.     

滚珠丝杠的温升及热变形对策

对滚珠丝杠的温升及热变形的对策进行了探讨，提出解决温升和热变形的方法，为滚珠丝杠的设计、安装、使用和维修提供参考。     

积雪覆盖下土壤热状况及其对气象因素的响应研究

为研究季节性冻土区在积雪覆盖条件下,土壤温度变化趋势及气象因素对土壤热状况的影响,以野外实测试验数据(2013年11月8日—2014年4月28日)为基础,分析裸地、自然降雪、积雪压实和积雪加厚覆盖条件下5、10、20、40、60、100、140 cm深度土壤温度变化特征,采用灰色关联度分析的方法筛选出影响土壤热状况的主要气象因素,进而统计土壤温度与气象因素之间的相关关系。结果表明:积雪的存在阻碍了环境与土壤之间的能量交换,引起土壤温度和土壤冻融过程的差异;随着积雪覆盖深度的增加,土壤的冻融日期会出现延迟现象,土壤温度相对稳定在较高水平,并且地、气之间温差增大;冻融过程中土壤温度变化的主要影响因素为环境温度,积雪覆盖使得气象因素与土壤温度的关联度减弱。     

支持细胞中促卵泡素信号通路研究进展

支持细胞在精子生成过程中起重要作用,支持细胞的数量决定睾丸大小、生精细胞数量以及最终生成精子数量。促卵泡素作为保证雄性生育能力的重要激素之一,通过与支持细胞上的促卵泡素受体结合,诱导5种信号途径,导致支持细胞中各类转录因子被激活,引起基因表达发生变化,从而保证生精细胞顺利发育成精子。文章主要围绕支持细胞中促卵泡素信号途径,及其对细胞发育过程中相关基因表达的影响等方面进行了综述。     

Comparative study on the effects of buckwheat by roasting: Antioxidant properties,nutrients, pasting,and thermal properties

The increasing need to prolong the shelf life of buckwheat has prompted the use of roasting techniques in buckwheat processing. For effective roasting, the responses of common buckwheat (CB) and tartary buckwheat (TB) to the process should be explored. Herein, the antioxidant properties, nutrients, pasting, and thermal properties of raw and roasted buckwheat flours (roasted at 200 °C for 50 s) from two CB and three TB varieties were investigated. Results showed that roasting considerably reduced the total flavonoid content (TFC) and total phenolic content (TPC) of TB. The TPC of CB was significantly improved by roasting, whereas the TFC significantly decreased. The total antioxidant capacities were consistent with the TPCs. Additionally, the colour deepened as the amount of antioxidant compounds increased. Unexpectedly, roasting enhanced the protein and fat contents of CB and decreased those of TB. Roasting improved the nutritional quality and antioxidant capacity of CB, and opposite results were obtained in TB. In conclusion, CB was more suitable to the development of roasted specialty products with nutritional applications than TB. We suggest that differences among varieties should be considered first in the buckwheat roasting process.