共查询到20条相似文献，搜索用时 125 毫秒
1.
自制USB采集卡构成虚拟仪器数据采集系统 总被引：1，自引：0，他引：1
目前在教学实验系统中越来越多地采用虚拟仪器技术来构建数据采集和处理系统，虚拟仪器的核心包括数据采集卡和上位机驱动、分析软件。在我们研制的旋转机械故障诊断检测实验系统中采用了自制的USB接口的数据采集卡，编写了驱动程序，并与Labview应用软件进行了链接。这样既节省了成本又保持了虚拟仪器的功能，是实验设备建设中一种较好的方法。 相似文献
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颜色现象需要亲身体验才能理解记忆,但长期缺乏定量可控的教学实验。针对这些问题开发出2套实验系统,用PC机通过USB接口和单片机,精确控制特制LED混色屏和直流电机驱动的颜色实验转台。色光混合实验系统借助计算机控制R、G、B分量,实现白平衡和颜色按参数变化。颜色转盘实验平台以计算机控制直流电机,驱动多种彩色径向开口圆盘匀速转动,以斩波器和光耦检测转速并实现闭环控制,完成颜色混合实验;还可观察变色频闪光源下呈现的周期彩色图案及主观颜色现象。两套实验系统可重复再现实验现象、定量和实时性好、操作简便,显著提高了色度学实验的教学效果。 相似文献
3.
庞春生 《中学物理教学参考》2009,(4)
人教版《物理》选修3—4第十三章第六节“光的偏振”一节中有两处内容应引起老师的注意．（1）演示实验：当两个偏振片P和Q的透振方向平行时,可观察到自然光经过两个偏振片后的透射光强度最大;若保持偏振片P不动,使偏振片Q绕光的传播方向为轴慢慢转动,可看见透射光的强度不断变化,由亮逐渐变暗,再由暗逐渐变亮,旋转一周将出现两次最亮和两次最暗． 相似文献
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基于MCS-51单片机系统,以CH372芯片为核心,设计出了USB接口单元电路和驱动程序。并以PC机为宿主机,通过USB接口,利用动态链接库技术完成了PC机与单片机系统间的传输测试。研究表明:在低于1Mbps速率下,能成功实现微机和单片机之间的数据交换,对于较高速率的传输方式,应采用更高效的驱动芯片或通信类专用单片机系统完成并实现微机和单片机之间的数据交换。 相似文献
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基于USB接口与LabVIEW的数据采集系统设计 总被引：3，自引：2，他引：1
设计了基于USB接口与LabVIEW的数据采集系统.单片机将采集到的信号通过USB接口与串口间的桥接控制器——PL2303传输到PC机,通过LabVIEW进行分析处理.整个系统分为数据采集和数据处理2部分.实验证明,系统能实时精确地显示单片机采集的信号. 相似文献
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介绍了通用串行总线标准(USB)接口芯片CH372的性能,描述了USB通信技术在热能信息采集系统中应用的总体结构设计,具体讨论了USB接口芯片的应用电路设计,并对应用系统的部分固件程序、设备驱动程序的编程方法及单片机通过USB接口与PC机进行通信的方法进行了阐述。 相似文献
7.
研究了一种基于相位差测量的精确测定偏振片透振方向的方法.一束光经过偏振片后变为线偏振光,其偏振方向即为透振方向,然后经过一个四分之一波片和偏振分光棱镜后,偏振分光棱镜的透射光和反射光的相位差与线偏振光偏振方向成一定的关系.通过外差干涉产生拍频光,用相位计采集这两束光的相位差即可确定偏振片的透振方向.在此系统中采用1°的相位计,即可以得到0.5°的测量分辨率.最后,实验证明此系统能够精确测量偏振片的透振方向. 相似文献
8.
基于USB接口的智能温湿度检测仪可实时检测、记录和显示温湿度及露点值,并滚动显示日期和时间,且掉电后数据不会丢失。与上位机(PC机)相连,既能实时绘制温湿度变化曲线,又可将记录的数据进行统计分析处理,生成Excel报表,计算任意测试时段的温湿度最大值、最小值、平均值和方差。该仪器与上位机的通讯采用USB接口,即插即用,增强了检测仪的通用性,使用方便。 相似文献
9.
脉搏检测实验装置的研制 总被引：3，自引：0，他引：3
卢超 《实验室研究与探索》2010,29(9)
研究了现有的脉搏信号处理方法及其测量技术,设计了一种脉搏检测实验装置。该装置由一个通道将时钟、脉搏测量和异常报警及效率定时报警结合起来,实现测定控制;另一个通道将处理后的信号通过USB接口送给上位机实现波形还原、脉搏波检测与控制。 相似文献
10.
为搭建实验系统,将3片线偏振片安装在FW102C型电动可旋转滤光轮上,通过计算机控制滤光轮转动分时采集3个不同偏振角度下的图像,再通过后续计算从而获得所观察场景的线偏振度图像和偏振角图像。针对系统误差校正,首先以马吕斯定律为基础,通过拟合方法完成偏振片偏振角度定标;然后通过手动选择配准点并借助Matlab图像处理工具箱完成视场非一致性校正。实验结果表明,所设计的偏振成像系统能够反映场景中不同目标的偏振特性。该系统结构简单、操作简便,可以满足教学实验的要求。 相似文献
11.
罗艳萍 《读与写:教育教学刊》2008,5(6)
The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity. 相似文献
12.
Richard Denner 《海外英语》2007,(4):14-15
Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose. 相似文献
13.
Given a graph G,a subgraph C is called a clique of G if C is a complete subgraph of G maximal under inclusion and |C|≥2. A clique-transversal set S of G is a set of vertices of G such that S meets all cliques of G. The clique-transversal number, denoted as TC (G), is the minimum cardinality of a clique-transversal set in G. The clique-graph of G, denoted as K (G), is the graph obtained by taking the cliques of G as vertices, and two vertices are adjacent if and only if the corresponding cliques in G have nonempty intersection. Let F be a class of graphs G such that F={G|K(G) is a tree}. In this paper the graphs in F having independent clique-transversal sets are shown and thus TC (G)/|G|≤1/2 for all G ∈ F. 相似文献
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《海外英语》2007,(5):10-11
Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help? 相似文献
17.
陈美曦 《山东教育学院学报》2008,23(2):103-107
Different nations have different social cultures, and the social culture of every nation is developing with the development of the nation, language is greatly influenced by social culture, which enables language to possess national and historical characteristics. Word is the smallest, independent, meaningful linguistic unit of language. It can well reflect the national and historical characteristics. From synchronic aspect, the social and cultural influence on word meaning is mainly embodied in conceptual and associative meanings of word. The incorrespondence of word meaning is a phenomenon that exists in both conceptual and associative meanings of word among different languages. From diachronic aspect, the development of social culture causes some changes of word meaning to some extent. Therefore, social culture plays a key role in vocabulary learning and mastery of a language. 相似文献
18.
邱崇丙 《唐山师范学院学报》2014,(1):21-23
汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。 相似文献
19.
《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献