机械设计课程设计DCAI课件的应用

机械设计课程设计中，需要进行大量的设计计算，本文主要介绍在DCAI课件中如何利用Excel辅助课程设计数据的计算，采用Excel可减少设计时的重复计算，提高运算速度，缩短计算时间，同时通过多计算几种方案，使计算结果更趋合理化，最优化。     

走出小学数学计算教学的误区

小学数学中计算具有基础性和工具性。在小学阶段学好四则混合运算计算，并形成一定的计算能力，这是终身有益的。但是，笔者在调研中发现了计算教学值得深思的现象，以往对学生计算能力的要求，如计算方法、技巧与速度等，现在很少提了，学生的计算能力比以前下降了，主要表现在计算正确率下降，口算速度减慢等等。而学生对计算的兴趣并没有因此而提高．     

商品进销差价率的简便算法

采用售价核算的商品流通企业，使用传统的计算方法计算进销差价率，还原商品销售成本，不仅账户设置复杂，而且计算工作量也较大，计算过程麻烦，容易出现错误。采用商品进销差价率的简便算法——含税差价率计算法，不但可以简化计算过程，减轻计算工作量，而且还可以简化账户的设置，对于提高工作效率十分有益。     

提升数学关键能力——计算技能

计算技能是提升数学的关键能力，在教学中，要重视算理教学，丰润计算课型，梳理易错类型，培养计算习惯，提升学生的计算能力。     

小学计算教学要与时俱进

我国学生擅长计算，计算能力在世界上名列前茅，小学数学教材中计算的分量很重、小学数学对计算教学非常重视。有了这些，我同可以说在计算教学上取得了辉煌的成绩，旦是，在取得辉煌成绩的背后还隐藏着很多问题，计算的改革也势在必行。     

差分精度对液压滑阀内流体数值解析的影响

：以液压控制系统中常用的滑阀为研究对象，通过对滑阀内流体流动的仿真计算，对本中采用的数值解析手法的差分方法、空间计算格子系等计算参数对计算结果的影响进行了分析和讨论。结果表明，上述计算参数对流场构造以及流量的计算结果影响相对较小。2种不同计算方法对滑阀轴向流体力的分析比较得出：作用在滑阀轴方向上的流体力对差分方法、空间计算格子系等计算参数非常敏感。如要得到较高精度的计算结果，采用压强和壁面切应力来直接计算流体力要比应用控制体内流体的动量守恒原理需要更密的计算格子系。这一结果有助于我们在进行流场数值计算时，根据不同的对象选取合适的解析手法和计算参数，节省计算时间，提高计算效率。     

算得快不如算得巧（Ⅰ）

一、背景材料。数学离不开计算。随着数学不断发展，数学的应用日益广泛，计算量与计算速度越来越成为人们关注的问题。要减少计算量、加快计算速度，一般来说，有两条途径：一是使用各种计算工具，如算盘、计算尺、计算器与计算机等；二是改进计算方法。     

袖珍电子计算器在统计教学中的应用

袖珍电子计算器在统计教学中的应用富浩光统计学中有关指标的计算，如平均指标的计算、标准差的计算等，由于参与计算的数据多，计算的层次也多，因此整个计算工作十分繁琐，计算效率很低，而且稍有疏忽就很容易出错．这种差错在学生中是很普遍的．尽管教材中来取了一些简...     

方法在于积累－－碱金属学习中应学会的两种方法

有位名人说过“关于方法的知识是最重要的知识”，由此可见，方法的重要性．在初中化学计算中我们掌握了常用的计算方法．到了高中由于知识的加深，某些化学试题再用常规的计算方法，往往计算复杂易错，有时根本解不出计算结果，因此我们进入化学课堂就应该积累解题方法，特别是化学计算方法的积累．在碱金属这一章我们需要积累两种计算方法：     

如何提高学生的计算速度

如何提高学生的计算速度一、加强计算法则的教学。计算法则是计算的依据。法则掌握得好，学生见题后能快速重现法则的内容，选择好算法。因此，要提高学生计算的速度，首先必须加强计算法则的教学，要让学生在计算时知其然也知其所以然，即不但要让学生掌握算法，而且能说...     

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.