To achieve accurate detection of surface potential , the measurement of the contact potential difference of the zno / si step was also carried out . polarization - related surface properties of ferroelectric thin films were investigated by kelvin probe force microscopy ( kpfm ) , leading to the discovery of asymmetric charge writing on the surface of pb ( zr _ ( 0 . 55 ) ti _ ( 0 . 45 ) ) o _ 3 ( pzt ) thin film 为了优化仪器的检测灵敏度和稳定性,选用氧化锌薄膜上的zno / si台阶作为测试对象,检测了zno / si的接触电势差;通过改变仪器系统参数,发现针尖-样品距离和扫描速度对接触电势差的检测结果影响显著。
In order to analyze the influence of airplane noise on indoor sound environment in the vicinity of beijing international airport , different of buildings , such as villages , schools , offices , commercial building are choose as monitoring objects , the characteristic of sound insulation for building around beijing international airport are monitored and analyzed 摘要为较好的分析飞机噪声对机场周围居民室内声环境的影响，研究选择不同类型的民居房、学校（多层建筑） 、基层机关办公用房、商品房等为测试对象，对北京国际机场周边地区建筑物隔声特性（插入损失）进行监测与分析，结果表明：现有民居、学校、机关办公室的隔声特性较差，商品房的隔声效果较好。
The input value of static weighing system is instant and the interference is small . nsr is high , then interference signal is ease to dispose . while dynamic weighing systems have different signal modes , yawp interference magnitude size and mode when it is in different facilities and different testing objects . in this thesis has optimum attempt in this point and find a solution which has perfect practicality 动态定量称量技术是一项很有前景的技术，在我国发展也有很久了，但是这方面的技术还是不成熟，由于动态比静态称量要复杂得多，静态称量由于输入值是恒定、干扰小、信噪比大，干扰信号易处理；而动态称量系统对不同的设备、不同的测试对象产生的信号形式、噪声干扰大小、方式均不同。
First of all the model building up the semantic model of domain knowledge with domain ontology ; secondly it sets up standardlize testing objects by referencing the standard of education information ; at last it establishes the relations between concepts of domain ontology and testing objects , by this way we can let the unattached testing objects become structural and semantic 该模型首先利用领域本体对领域知识建立语义模型,得到领域知识的整体结构;其次参考教育信息化建设元数据标准构建测试对象;最后在领域本体中的概念和测试对象之间建立映射关系,将相互独立的测试对象结构化、语义化。
The development of sclence , production and community have expounded demand to testing higher and higher . with the testing objects changing from a single static parameter to several active ones , even a group of active courses , apparatus have passed through the way of analog , digit , brain and virtual . that the technology and apparatus of testing will follow the develop tendency of computer has already popular in testing field . the virtual instrument has been mentioned for years , but it still in the stage of studying , discussing and probation . this paper try to use the universal serial bus popularity in personal computer as a core to constitution the virtual instrument testing platform , including understanding of criterion , studying of interface , manufacting of devices , develop of software and constructing of system and so on . the aim is to put the virtual instrument to applying quickly , using this new convenient , flexible , efficient and cheap method 科研、生产和社会的发展对测试提出越来越高的要求，随着测试对象从单一静态量发展到多个动态参量甚至一组动态过程，仪器仪表也走过了模拟、数字、智能和虚拟的发展道路，测试技术和仪器跟着计算机走的发展趋势已经成为测试界的共识。其中，虚拟仪器虽已提出多年，但仍处于研究、讨论与试用阶段。本文试图以当前pc机普遍配置的通用串行总线usb （ universalserialbus ）为核心，构建虚拟仪器测试平台。
