新型SERS光纤探针的制备

以单模石英光纤为材料，首先用管腐蚀的方法制备出光纤探针，然后在管表面镀一层银膜，构成具有表面增强特性的管状光纤探针。将光纤探针应用到拉曼光谱仪上，实际测量了几个具有代表性样品的拉曼光谱，实验表明效果较好。     

液芯光纤清洗系统的研制

液芯光纤可以大幅度提高拉曼光谱强度,共振拉曼光谱强度可以提高10~6倍。怎样能使液芯光纤重复使用,清洗液芯光纤是至关重要的环节。本文介绍了一种简单、实用的液芯光纤清洗系统。     

光纤Bragg光栅传感监测解调系统设计

采用波分和空分混合复用技术和LabVIEW,设计了一种可通过单片机控制的光纤Bragg光栅(FBG)传感监测解调系统,实现了温度和应变的实时监测。实验研究表明,在20～100℃范围内,温度监测平均误差0.3℃,标准差0.163℃,实验灵敏度与标定灵敏度之间的灵敏度误差为0.29%;在0～390με应变范围内,应变监测平均误差2.79με,标准差2.63με,悬臂梁上下FBG实验灵敏度与标定灵敏度之间的灵敏度误差分别为0.10%、0.19%。该解调系统实现了高灵活性、高精度的温度和应变监测。     

基于荧光寿命与热辐射测温的30℃至800℃的光纤温度传感器

通过研究荧光型光纤温度传感和热辐射型光纤温度传感，该文设计了一种结合荧光寿命与热辐射测温的光纤温度传感器，适用温度为30～800℃。首先，改进了传统的荧光传感探针，采用石英玻璃棒代替光纤，可避免高温下光纤吸收和散射损耗导致的光传输效率下降。其次，利用耐高温的Y(P,V)O₄:Eu³⁺荧光材料进行中、低温段(低于400℃)的荧光寿命测温，获得材料荧光寿命与温度的关系；在中、高温段(高于300℃)，使用光功率计测得1 490 nm波长下光纤探针的热辐射功率与温度的关系，并拟合得到热辐射功率与温度的四阶表达式；然后，在两种测温方法都有效的温度重叠区(300～360℃)，使用荧光寿命测温值标定热辐射的功率与温度关系式，确保高温段的测温精度；最后，将荧光寿命测温与热辐射测温相结合，实现30～800℃范围内的温度测量。     

光纤热辐射能的研究

本文从理论和实验两个方面,研究了石英光纤发自自身的热辐射能及其随温度变化的规律。计算结果与实验基本一致。本研究预示:用石英光纤在300℃～1200℃范围,可以方便地制成高温光纤温度传感器。从而为解决强电磁场强腐蚀环境下高温测量,提供一个基础。     

光纤探针在拉曼光谱仪中的应用

我们把拉曼光谱仪与实验室自制的光纤探针结合起来,建立了微区拉曼光谱系统,并基于此装置进行了实际测量,效果较好.     

光纤拉曼放大器及其研究展望

阐述了光纤拉曼放大器的原理、分类,并对其研究现状、发展趋势和研究展望进行了探讨和总结。其中,采用有限元法,着重数值仿真了光纤拉曼放大器放大信号的原理过程。结果表明,基于Chraplyvy模型能够较好地模拟出受激拉曼散射作为光纤拉曼放大器原理的过程,并且其程序运行效率高于采用洛仑兹模型。通过研究综述,为光纤拉曼放大器的理论研究、实验和工程应用测试工作提供了参考。     

光纤式激光诱导击穿光谱实验平台开发

基于光纤传能设计并开发了光纤式激光诱导击穿光谱实验平台，该平台包含纳秒脉冲激光源、光纤光谱仪、数字延时发生装置等硬件设备，同时包含具备光谱数据显示储存、定量分析、结果报告等功能的配套软件。实验平台解决了激光-光纤耦合、激光馈出后的二次聚焦、光谱信号收集回传等关键技术。研究结果表明：所开发的光纤式激光诱导击穿光谱实验平台运行稳定；实现了材料元素组成远距离的自动化识别与定量检测。在激光诱导击穿光谱仪器设计、开发方面具备较好的参考价值。     

超长距离系统中光纤拉曼放大器的设计

简述了各种结构光纤拉曼放大器的性能,充分考虑了实际情况,从同向抽运与反向抽运光纤拉曼放大器的耦合微分方程出发,对两者信号光的功率演变过程进行了推导,并引进设计实例,说明了综合利用同向抽运与反向抽运各自放大信号的特点可以设计长距离和超长距离系统中的双向抽运光纤拉曼放大器,为光纤拉曼放大器的进一步研究提供了参考。     

拉曼光谱鉴别宝石教学实验的开发

针对拉曼光谱实验授课面较窄、内容不够充实的问题,开发了拉曼光谱鉴定宝石的新实验,用于本科生实验教学。探讨了实验的教学方法和教学过程,并对教学效果进行了分析。     

Western and Eastern culture differences in commercial field

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.     

风的曲线

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.     

团图为数的图中的闭团贯数

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.     

汉字倒说

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。     

卡思卡特城堡

It is worthy of noting that, whilst Crookston Castle witnessed the earlier and happier portion of Mary's variegated life,     

不同的吃喝玩乐

一、吃和喝吃苹果 eat an apple, 吃药 take medicine,吃糖 have some sweets,吃饭 have one's meals,吃馆子 dine out,吃惊 be surprised/     

漏洞百出的教育

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?     

Social and Cultural Influence on Word Meaning

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.     

钱生钱!

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     

只要努力,不要后悔

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.