关于高中物理实验误差的探究

物理是实验的科学,所以物理实验教学是中学物理教学的重要组成部分.纵观整个高中实验教学,做得最差的当属误差分析.误差是实验的一部分,将从头到尾地伴随着整个实验过程.所以,加强误差分析的教学刻不容缓.当然,限于高中学生的认知水平,误差分析不应有过于艰深的数学运算,而应着重于通过误差分析加深对物理实验的理解.依个人浅见,误差分析的教学应从以下两个方面入手.     

浅谈"测电源电动势和内阻"误差分析的授课方法

物理实验是考查学生基本技能的重要方法和手段,在近几年高考试题中,实验的考查力度逐年加大,分值逐步提升,尤其是对实验误差分析的考查日益突出.误差是指真实值与实验值之间的差距,误差分析是高考的难点问题.有实验必有误差,误差来自多方面.近年来笔者在教学实践中发现学生对误差分析仅停留在初中的基础上,把一切误差都归结于偶然误差,缺乏理论分析.     

化学实验教学中关于误差分析的几处误读

误差分析是化学定量实验教学中的一个重要环节,然而教学中经常会出现夸大疏忽误差,且误读系统误差和偶然误差等问题。教学中全面分析各种误差来源和影响,合理引导学生分析理解误差来源甚至校正误差,可以有效提高学生的综合科学素养。     

例谈两类实验误差的分析

学生的误差分析能力是其物理实验能力的一个重要方面 ,偶然误差和系统误差由于其产生的原因不同 ,相应的误差分析方法也不同。在进行误差分析时 ,首先应正确判断误差的类型 ,再根据不同类型误差的要求进行分析。本文将通过两个实例谈谈作者的观点。1　偶然误差的分析偶然误差是     

中考中的测量物质密度“误差分析”

“误差分析”,无非就是分析质量和体积是变大还是变小,解决此类问题应该重点去判断是哪个环节导致了误差的产生,然后进行分析判断质量和体积是基于什么原因而导致发生了变化,从而产生了误差.     

普通物理实验中的误差分析

普通物理实验离不开测量,而测量又会带来一定的误差,我们在实验中常常需要进行误差分析。误差分析的目的是根据误差的规律,合理地设计和组织实验,正确地选用测量工具和测量方法;同时要根据误差理论来确切地评价测量结果中所包含的误差大小,以便更好地选用测量数据,对物理理论进行验证和分析。误差分析在其它领域也有着广泛的应用,而且     

谈测量电池的电动势和内阻误差的分析方法

由于实验原理不完善,实验仪器本身不精确,实验者自身的操作行业不规范,致使实验存在着误差．如何使实验做得更精确呢？进行误差分析就为完善实验原理、精确实验操作提供了有力的依据,同时进行误差分析需要选取合适的分析方法．因此,归纳误差分析的方法是非常重要的．本文就U-I,法测量电池的电动势和内阻的误差分析的方法进行探讨．     

浅议误差理论在数值分析课程教学中的重要性

数值分析的特点是抽象和严格的演绎,思维逻辑严密,讨论的核心问题是误差。在课程讲授中,误差分析理所当然应该成为不可避免的一个重要环节。本文从几个方面对课堂教学中强调误差分析的重要性进行了阐述,并举了一系列的例子进行了论证。     

利用CAD分析V型块Z向定位误差

加工过程中的定位误差分析是工程技术人员处理工程案例时较繁重的任务之一。定位误差分析是否正确,直接关系零件加工质量和合格率。本文旨在利用CAD辅助分析研究V型块Z向定位误差,为工程技术人员提供一种利用CAD制图软件辅助分析定位误差的方法,可以避免不必要的工程计算错误。     

关于正态分布及其误差分析的研究

正态分布的性质及误差分析在高能物理与粒子物理处理实验数据时是非常有用的。文章从三大方面分析了正态分布的性质、误差分析以及正态误差报道的概率意义。     

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.     

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…     

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.