共查询到20条相似文献，搜索用时 359 毫秒
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《实验室研究与探索》2016,(9):24-27
建立了数字微镜(DMD)数字化制作系统,通过光栅数字掩模生成、曝光、显影、PDMS复制、PDMS固化,制作了PDMS柔性薄膜光栅。将该柔性薄膜光栅应用于光栅光谱仪原理系统中,先对系统进行定标,再测量待测光源波长,波长测量相对偏差为2.10%。为了评估光栅的制作质量,采用光栅光谱仪原理系统对光栅周期进行测量,相对偏差为2.15%;利用光学轮廓仪对光栅二维、三维形貌进行检测,光栅周期相对偏差为1.45%,光栅的整体轮廓光滑,均匀性较好。制作实验及测量结果表明,基于DMD的数字化制作技术为柔性微结构及器件的制作提供了一条简单、高效、低成本、高精度制作的新途径。 相似文献
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张恒 《辽宁教育学院学报》2000,17(5):22-24,31
本文导出了同心环形光栅莫尔条纹在测量折射率方面的定量表达式，并给出了测量结果，提供了同心环形光栅莫尔条纹测量折射率的即简洁又精确的方法。 相似文献
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张援 《四川职业技术学院学报》2004,14(1):110-111
环形光栅(CG)的中间和边缘的稀密程度一样，对于相同面积的菲涅耳波带板(FZP)和CG，当CG的条纹间隔等于FZP最边缘的条纹间隔时，CG的自相关特性比FZP的自相关特性更接近于δ函数。本文在圆孔衍射的基础上，讨论环形光栅的菲涅耳衍射，并给出了计算机仿真结果。 相似文献
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研究了带均匀布拉格光栅的光纤环镜的滤波特性,并提出了一种用两个带有光栅的光纤环形镜相串联来改善环形镜滤波特性的方案.利用传输矩阵法,推导了这两种滤波器传输谱的解析表达式,分析了其滤波特性.模拟结果显示,带均匀布拉格光栅的光纤环镜的透射谱是余弦函数调制后的光纤光栅反射光谱,具有梳状滤波的特性.两个单环形镜相串联,其波形并非他们的简单叠加,而是以等比数列叠加的,级联后的效果更加类似于法布里–珀罗腔滤波器的滤波效果,可以在光纤传感和通信领域中获得更加广泛的应用. 相似文献
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从光纤光栅温度传感模型出发，分析研究光纤光栅的温度传感特性，比较裸光纤光栅与增敏光纤光栅的温度敏感性，在此基础上提出一种基于滤波法的光纤光栅解调系统，研究表明，此系统具有结构简单，操作方便，灵敏度高的优点。 相似文献
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数学课本上写到,环形的面积等于外圆的面积减去内圆的面积。指导学生学习这一内容时,我产生了一种想法:假设能把环形伸展成一个长方形(或把环形分割成相等的若干份,然后拼成一个近似长方形),按求长方形的面积公式来求环形的面积是否可以呢?带着这个想法,我试推测到:外圆的周长加上内圆的周长,然后再除以2,就相当于长方形的“长”,外圆半径减去内圆半径,就相当于长方形的“宽”。根据:“长方形的面积=长×宽”得到:“环形的面积=(外圆 相似文献
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本文对环形轨道运行物体的速度、周期等物理量随半径的变化规律进行了推导,给出了规律性的结论,并加以例题说明。 相似文献
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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
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《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
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Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject. 相似文献
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Rachel Zupek 《海外英语》2007,(11):40-41
我们绝大部分人都同意一件事情——我们喜欢金钱。但是你对金钱的喜欢之情足够到让你创立一份事业么?.财富通常被人忽视,主要在于人们不能真正了 相似文献
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Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities. 相似文献
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RUZBEHANI Mohsen 《重庆大学学报(英文版)》2004,3(1):20-25
1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec… 相似文献
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YANGShiguo 《重庆大学学报(英文版)》2004,3(1):86-88
The problem on the geometrc inequalities involving an n-dimensional simplex and its inscribed simplex is studied. Aninequality is established, which reveals that the difference between the squared circumradius of the n-dimensional simplex andthe squared distance between its circumcenter and barycenter times the squared circumradius of its inscribed simplex is not lessthan the 2(n-1)th power of n times its squared inradius, and is equal to when the simplex is regular and its inscribed siplex is atangent point one. Deduction from this inequality reaches a generalization of n-dimensional Euler inequality indicating that thecircumradius of the simplex is not less than the n-fold inradius. Another inequality is derived to present the relationship betweenthe circumradius of the n-dimensional simplex and the circumradius and inradius of its pedal simplex. 相似文献
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