一种组合式光纤大位移传感器的研究

大型工程如坡体滑移、地基沉降等的变化都属于位移较大的移动。因此根据OTDR的弯曲损耗测试原理,设计了一种基于此原理的组合式光纤传感器,该传感器可以根据实际位移变化的需要改变量程的大小,并对单个该传感器进行了理论推导和试验测试,得出拟合公式。该实验结果可为弯曲损耗位移光纤传感器的开发研究作参考。     

试论大学生就业心理障碍与调适

在当前严峻的就业形势下,大学生的心理问题也随之凸显,在择业过程中表现出了情绪障碍、认知障碍、人际障碍等方面的问题。如何帮助大学生进行心理调适．使他们以健康的心态走上工作岗位,既是社会和高校密切关注的热点,也是值得探讨和研究的问题。     

再论陈子昂的文学理论及其时代意义

初唐杰出文学家陈子昂,在诗文革新中起到了至为关键的作用。陈子昂的文学理论包含“风雅说”、“兴寄说”和“风骨说”三项内容,不但有明确的指导思想,还提供了具体的实践方法——以“风雅说”为体,“兴寄说”、“风骨说”为用。陈子昂在实践其理论的创作活动过程中,对当时的绮靡文风和以后的文学创作产生了巨大的影响。     

先秦汉语的“非”和“匪”研究

先秦时期的非和匪,在很多字典辞书以及古代汉语教材中,都不加以区别,用简单的同或通来解释。有必要对这两个字进行历史的考察,得出符合语言事实的结论。非和匪的用法由于时代的不同而发生着变化。同时文章又对篚字进行了描述,理清了非、篚、匪之间的关系,希望通过对这两个字使用情况的统计,可以对先秦典籍的断代起到帮助。     

与“强弩之末”有关的几处断句问题

《史记·韩长孺列传》"且强弩之极矢不能穿鲁缟冲风之末力不能漂鸿毛"一句,后人有两种断句方法。本文从"强弩"所指入手,试图解决此句及与"强弩之末"相关的几处断句问题。     

论《聊斋》系列小说中教育题材创作

《聊斋》系列小说十分重视教育问题,其教育题材中体现的教育思想对今人也有一定的启示意义。本文试从家庭教育、学校教育、社会教育三个角度进行分析,以期丰富对《聊斋》系列小说的解读。     

Viral infection of tobacco plants improves performance of Bemisia tabaci but more so for an invasive than for an indigenous biotype of the whitefly

The ecological effects of plant-virus-vector interactions on invasion of alien plant viral vectors have been rarely investigated. We examined the transmission of Tomato yellow leaf curl China virus (TYLCCNV) by the invasive Q biotype and the indigenous ZHJ2 biotype of the whitefly Bemisia tabaci, a plant viral vector, as well as the influence of TYLCCNV-infection of plants on the performance of the two whitefly biotypes. Both whitefly biotypes were able to acquire viruses from infected plants and retained t...     

Electromagnetic effects on the biological tissue surrounding a transcutaneous transformer for an artificial anal sphincter system

This paper reports on the electromagnetic effects on the biological tissue surrounding a transcutaneous transformer for an artificial anal sphincter. The coupling coils and human tissues, including the skin, fat, muscle, liver, and blood, were considered. Specific absorption rate (SAR) and current density were analyzed by a finite-length solenoid model. First, SAR and current density as a function of frequency (10–10⁷ Hz) for an emission current of 1.5 A were calculated under different tissue thickness. Then relations between SAR, current density, and five types of tissues under each frequency were deduced. As a result, both the SAR and current density were below the basic restrictions of the International Commission on Non-Ionizing Radiation Protection (ICNIRP). The results show that the analysis of these data is very important for developing the artificial anal sphincter system.     

基于Fourier变换的异步电机故障诊断研究

异步电机定子电流中包含因转子断条引起的故障特征频率成分,由于和基波频率接近,难以直接提取。推导出PARK矢量模平方函数的数学表达式,可以消除基波对特征频率的影响。对PARK矢量模平方函数进行FFT变换效果很好,对电机故障有很高的辨识度,是一种有效的方法。     

一个新的混沌系统的设计及其电路实验验证

构造了一个新的混沌系统,并对该系统的耗散性、平衡点的稳定性、Lyapunov指数和分岔图等基本动力学特性进行了分析.通过计算机仿真观察到了该系统的混沌现象,设计了实现该系统模拟电路,并提出一种确定此类电路元件参数的计算方法.电路实验结果与动力学特性分析、数值仿真完全相符,验证了系统的混沌行为.