谐振子量子制冷循环性能的优化分析

基于量子主方程和半群逼近研究以谐振子系统为工质，由两个等温和两个等谐振子数过程组成的不可逆谐振子量子制冷循环的一般性能特性，导出了制冷循环的制冷系数、制冷率、输入功和熵产率等重要参数的一般表达式．并详细讨论了高温极限下谐振子量子制冷循环的优化性能，导出了最大制冷率和相应的制冷系数．所得结论可为非常规工质低温制冷循环的优化设计提供理论基础．     

给显微镜添指针

给显微镜添指针湖北省当阳市长坂高中（４４４１００）任友喜目前中学里使用的光学显微镜，一般都没有指针，在一定程度上影响了实验效果。为了提高观察生物装片的速度，增强学生的观察实验效果，可对光学显微镜略加改装，在视野中增加一根指针，便于观察。具体作法是：显...     

半导体制冷技术及其应用

具有广泛应用前景的半导体制冷技术是利用电能直接使热量从低温物体移至高温物体的制冷新技术．本文介绍半导体制冷技术原理、特点及应用．     

显微镜成像问题

在各种复习资料和生物考试、竞赛中，常常可以见到这样的试题。将一写有字母“P”的载玻片正置于显微镜下进行观察，看到的物像是（）A．PB．qC．hi）．d参考答案是D。其实，选B也是正确的，原因在于用作观察的显微镜类型的不同。目前，各中学使用较多的普通显微镜有两类，一类     

基于DirectShow的生物多媒体教室方案与实现

生物多媒体实验室已经在全国大多中学已经构建起来，但是目前仅是有显微镜，投影仪等硬件部分，各个设备之间分散没有联系，教学资源没有有效整合，教师和学生之间依然是孤立的进行实验，教师根据显微镜画面的讲解和与学生交流受到很大的限制，本系统旨在建立一个基于计算机网络及DirectShow技术，互动式的多媒体实验室。实现了生物实验室的资源整合，更大程度的利用教学资源。     

生物显微镜物的检测与校正

本文通过观察星点像的实践，判断生物显微镜物镜像差存在情况，总结显微镜物镜像差的校正方法。从而提高生物显微镜物镜成像的质量。     

对1994年高二生物实验会考的初步分析

1994年7月我市对高二年级的生物实验进行了会考，尚属首次。这样大规模地考查实验，毫无疑问对我市的生物实验教学起到推动作用，对于规范实验教学，提高学生的实验技能具有重要意义。通过对铁一中考点的考试结果分析，可以推测当前我市的生物实验教学的现状和存在的问题。一、考题：显微镜的使用及观察植物细胞有丝分裂的装片二、考试结果分析：（－）总评成绩分析：从平均分8．47分和及格率91．56％，可以看出目前我市的生物实验基本上达到了预期的目的，对生物实验的教学给予了肯定。但从平均用时可以看到近10分钟的时间调试一次显微镜，…     

制冷与低温工程研究所实验室建设与管理探索

随着国家对制冷与低温工程学科科研的不断投入,上海交通大学制冷与低温工程研究所的科研内容、设备种类和数量等都发生了显著变化。对进一步提高实验室的安全性、科研场地的利用率以及设备的共享率等做了一些探索,针对自身的特点和问题采取了相应的措施。     

地方

正9山东:青岛市科学技术奖励大会召开2020年12月22日上午,青岛市科学技术奖励大会召开,对获得2019年度青岛市科学技术奖的项目和人员进行表彰奖励。2019年度全市共有155个项目(人选)获奖。中国海洋大学教授、中国工程院院士李华军,海尔生物医疗股份有限公司总经理刘占杰荣获市科学技术最高奖。李华军主要从事海洋工程安全与防灾领域的研究与工程实践,刘占杰长期从事生物医疗领域低温制冷技术研究、产品研发及经营管理工作。     

利用显微镜改制显微投影仪

目前很多学校没有显微投影仪,给生物课的教学带来一定困难。利用显微镜改制成显微投影仪,改装简单,操作方便,一物二用,能收到较好的效果。现将方法介绍如下:1.采用普通生物显微镜,如用 XSB—03型生物显微镜,把低倍率物镜(如用放大倍数为10、N.A.0.25的物镜)安置在物镜     

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!     

The Reader Response Approach to Teaching of English Literature

During interview with English majors, it was found that a majority of students expressed disappointment with their experience of English literature classes. Students' dislike of learning English literature appears to be the major problem of teaching English literature in China. Reader response approach is a good way to solve this problem. In this paper, I explain the rationale behind the reader response approach, such as its origin, definition, features, assumptions, and strategies. Then I illustrate how reader response approach works as a teaching strategy by presenting several teaching models. At last I evaluate its usefuiness for teachers and present the advantages of reader response approach in Chinese context.