变温条件下光纤拉曼光谱测试及其意义

对某种光纤在温度范围从-70℃到70℃进行了变温拉曼光谱测试。实验结果表明，光纤的拉曼光谱非常稳定，几乎不随温度变化，说明该光纤化学结构在实验温度范围内能够保持稳定，暗示了光纤质量在实验温度范围内是可以保证的。因此，实验证明拉曼光谱可以作为检测光纤质量的一种有效手段。     

基于聚合物体光栅的全息传感器温度响应特性

测试了全息传感器的环境温度响应性能,实验测试中光栅衍射谱峰值呈现直观与稳定的温度响应,并发现了衍射谱峰值波长随温度的蓝移现象。测试了在不同温度及湿度条件下的平均折射率,证实了波长蓝移的主要诱因。实验结果为深入分析传感器的传感机制提供了重要实验基础,同时为全息传感器的实用化提供了重要环境响应参数。在显著传感现象的基础上,能够使学生了解并掌全息光学装置科技前沿发展现状与最新应用领域。     

石墨烯湿敏传感器件的呼吸检测实验装置

设计了基于纳米修饰石墨烯的湿敏传感器呼吸检测装置,并对其电容湿度传感器的湿敏特性及呼吸特性进行测试分析。采用自组装方法制备氧化锌修饰氧化石墨烯薄膜湿度传感器,采用电子扫描电镜对其形貌进行表征,基于555多谐振荡器和STM32单片机构筑了一种柔性薄膜型呼吸检测装置,并对其性能进行了测试。实验结果表明,该呼吸检测装置具有高灵敏度及优良的响应与恢复特性,并且经蓝牙同手机通信可实时显示呼吸频率,展示了较好的呼吸检测效果。     

色度参数测量系统的研制

根据光电信息科学与工程专业光电综合实验课程的需要,研制了基于光纤光谱仪的色度参数测量系统,以光纤光谱仪、小型积分球等模块搭建装置,使用Python编写色度参数处理软件,实现分光光谱测色.系统测试结果有效性评估实验、混色实验、LED工作电流对发光光谱影响实验、常见照明光源光谱测量实验等测试结果,证明该系统满足GB/T79...     

新型饱和蒸汽压及传质系数测试装置

设计和搭建了一套新型饱和蒸汽压及传质系数测试装置,并介绍了该装置的结构及工作原理。通过静态法测定液体饱和蒸汽压实验测试去离子水在不同温度下的饱和蒸汽压,对该装置的准确性进行了验证。实验结果表明:测试结果与理论值相吻合,其测试误差在±10%以内。该装置基于气液平衡原理,实现了在同一装置中采用同一压力传感器对液体饱和蒸汽压和气液传质系数进行测试,成功消除了系统误差,对改善实验质量具有明显的效果。     

液晶动态响应实验研究

为了分析液晶的响应时间并判断其响应速度,开发了液晶动态响应测试装置,并对强锚泊扭曲排列向列液晶的动态响应过程进行了测量。当脉冲信号施加于液晶盒上时,液晶的响应时间,即上升时间随电压的增大而减小;当脉冲信号撤消时,液晶的响应时间,即下降时间基本保持不变。与液晶动力学理论数值计算结果进行比较表明,实验结果和理论结果基本吻合。     

管路特性曲线测定实验装置的设计与测试

随着变频技术的发展,它在泵流量调节方面的作用越来越受企业认可。化工原理实验紧跟形势增加了离心泵流量变频调节章节。为了满足实验教学需要,对实验装置进行了设计与测试。该文阐述了实验装置设计思路和测试过程。测试结果表明:该实验装置可以满足实验需要,有助于进一步优化实验结构,培养学生工程观点,丰富更新学生的知识体系。     

Fe、Cr掺杂TiO_2光催化分解水制氢综合性实验设计

设计了TiO_2光催化分解水制氢的综合性实验,分别合成了无掺杂、Fe掺杂和Cr掺杂的3种锐钛矿型TiO_2,通过X-射线衍射仪和紫外-可见漫反射光谱对材料的晶型结构和光响应性质进行了表征,同时测试了3种材料的光催化分解水产氢活性,通过气相色谱法对产氢量进行定性和定量分析。结果显示,该综合性实验有助于学生了解光催化学术研究前沿,激发学生的科研热情,又可以提升学生的综合实践能力和创新思维能力。     

半转翼飞行器二分量升力测试装置设计与研究

为验证一种新式半转翼飞行器试验模型升力的大小,设计了一种新型二分量升力测试装置,解决了现有升力测试装置成本昂贵、结构复杂及适应性差的问题。基于ADAMS软件建立了二分量测试装置静态分析模型,并对测试装置进行了静态分析,分析结果表明了测试装置力学模型建立的正确性;通过ADAMS软件建立了二分量升力测试装置的动态分析模型,采用adams软件对测试装置进行了动态分析,得到测试装置固有频率与动态输出结果,为半转翼飞行器电机转速的选择提供了依据,同时奠定了后续实验的基础。     

光应力测试实验的创新与教学实践

本文通过对光应力测试装置的创新,设计了适合本科教学实验的低成本光应力测试实验装置。学生通过该实验装置可进行自主设计型实验和研究性实验,将研究能力和创新精神的培养融合实验环节中,使其更加符合本科教学实验装置的要求,极大地激发了学生的创新能力。     

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?     

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.     

浅谈移民问题

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.     

Sister Carrie, an Adherent of Desires

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.     

Improvement of one-cycle controller by use of proportional integral differential controller

1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec…     

库克斯顿城堡

城堡, 是欧洲典型的建筑之一, 每个城堡都有一个美丽的传说或是一段历史。从本期开始, 我们将推出“城堡之旅”, 带各位读者去浏览、观赏欧洲各地的城堡, 开始一段文化与历史的旅途!     

胡主席在印度,我却在中国

Today, Sunday morning, I sit thinking and typing at my computer. My thoughts are in my homeland, India and my body is in China. The body is here and mind there for a good reason. Mr. Hu is president and I am resident and both are in each other's countries (what a difference the absence of one small letter makes!). Mr. Hu will return in a few days and I will stay on longer.