分光仪的分步调节法

《分光仪的调整与使用》的实验,是普物光学实验中,一个重要实验.因为分光仪是一种较精密的仪器,所以仪器调整的好坏,将影响测量精度的优劣.其中调节望远镜、载物台平面两者,同时与分光仪的仪器主轴垂直,是调节的难点.目前出版的各种教材中,均采用一种称之为“各半渐近”的调节方法.此方法的思想基础是,认为望远镜和载物台平面与仪器主轴不垂直的概率,各占百分之五十.因此实验中可将望远镜和载物台平面进行并半调节,经过几次,就会达到目的.然而实际情况并非如此,往往不是望远镜的因素多些;就是载物台的因素多些.这样一来,势必要多次“矫枉过正”的调节,因此费时费力.对此有些学生感到厌倦,甚至有时问老师,能否找到一种快速、准确的调节方法.     

关于分光仪的调节

本文提供了分光仪的一种新的调节方法,该方法简便可靠,弥补了传统调法中耗时费力的缺陷。     

分光仪实验装置的改造设计

利用旧设备的总体框架,对分光仪成像功能的精髓部分进行改造,参照目前国内较为先进的光学实验设备,综合利用所学光学和电学知识,采用目前较为流行的LED发光二级管,进行组合设计．改造后的新装置成像清晰度高,观察简单,调节容易,大大节省了学生的调节时间．     

JJY1’型分光仪的保养和故障维修

分光仪是一种十分精密的分光测角的光学实验仪器。做好仪器的保养和故障维修工作,是延长仪器使用寿命的保证。在大学物理光学实验中,由于所用仪器使用频率高,出现各种故障的概率随之增高,及时有效地排除故障,保证实验教学的顺利进行,是实验技术人员重要的工作。介绍了JJY1’型分光仪的保养和常见故障排除方法,供分光仪的使用者、维修和维护者参考。     

自制X射线分光仪的介绍

晶体分光仪是测定X射线波长的一个主要方法。同时X射线波长的测定,对于原子构造的分析起了很重要的作用。因此,X射线波长的測定在高等物理实驗中应有它的地位。但是要作这个实驗,很难得到現成的設备(国內外仪器厂沒有制成的产品)。为了获得經驗,决定自制,和与有关方面协作制造与分光仪有关的各个部份的設备。分光仪的原理比較簡單,即布拉格方程,     

用分光仪测θ角出现负值的一种修正方案

在用分光仪测玻璃折射率的实验中,如果θ角度测不准,则会影响到棱镜角 A 及玻璃折射率 n 的测量精度,实质上,分光仪就是测角仪,因此角度的计算是非常重要的。下面就本人在多年的教学中遇到的有关θ角度出现负值的问题,通过分析得出解决的方案。     

用透射光栅测定透明液体折射率

文章介绍了利用分光仪和透射光栅等实验室常用仪器,通过测量光在不同介质中的衍射角来测量透明液体折射率的方法。     

分光计调节难点解析

分光计是大学物理实验中常用的一种仪器,由于调节内容鞍多,快速调出反射镜两个面反射的十字像是分光计实验中的难点.本文就此难点调节方法给了切实有效的详细叙述.     

一种快速调节分光计的方法

文章分析了分光计的调节步骤和调节中出现的现象,指出调节分光计的关键和难点,介绍一种用平面调节反射镜快速调节分光计的原理和方法,从而加快分光计的调节速度。     

《人和动物生命活动的调节》考点精析

《人和动物生命活动的调节》此部分内容．是高中生物的主干知识板块,也是近几年高考考查的重点和难点,主要涉及神经调节、动物激素的调节、血糖的平衡和调节、特异性免疫等。     

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?     

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.     

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.     

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.     

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…