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本文分析了重力对惯性秤频率（γ）的影响，导出了γ2－θ（倾角）函数关系，在理论和实验上定量地指明了如何测绘惯性秤的定标线。 相似文献
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孙彦清 《陕西理工学院学报(社会科学版)》2003,21(3):50-52
理论上计算弹簧质量对小振动系统的影响比较复杂，用焦利氏秤组装一小振动系统，通过对振动周期的多次测量，利用作图法并借助于MatIlenlatica数据处理程序对实验数据进行分析，可获得弹簧对小振动系统的质量影响因子，测量结果与理论值十分接近。 相似文献
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两个刚性连接的电荷相对于某惯性系运动时，二之间具有相对论性作用力。即除了电场力还有磁场力产生．从理论上推导了这种力的具体表达式，得出了相应的结论。 相似文献
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质点系的动量定理、动量矩定理和动能定理等基本定理，只能适用于惯性系。本在非惯性系中，考虑了每个质点所受到的惯性力，从牛顿第二定律出发，推导出了适用于非惯性系的质点系动力学基本定理。 相似文献
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本文采用电热分离法、清水漂浮法和振动分离法对不同样本中甲螨的分离时间、数量，样本的放置时间及电热分离所用热光源作了比较。结果证实，分离土壤甲螨时．采土深度以１０ｃｍ为宜，土壤放置７天与立即分离所获甲螨数无差别。少量土样直用清水漂浮法，大量土样宜用电热分离法。而植被样本宜用振动分离法。 相似文献
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用振动法研究弹簧振子的有效质量和倔强系数 总被引：1，自引：1，他引：1
这是一个改进型实验。该实验使用集成霍尔开关传感器，结合焦利氏秤用振动法求弹簧的倔强系数，并介绍了计算弹簧有效质量的一种方法。 相似文献
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非惯性参照系中的Lagrange方程 总被引：2，自引：0，他引：2
颜振珏 《黔南民族师范学院学报》2004,24(6):8-11
从非惯性参照系中的惯性力表达式出发，找出与之相对应的广义势函数U’，进一步写出与之相对应的类Lagrange函数表达式L″，从而推导出在非惯性参照系中的第二类Lagrange方程和保守力系的Lagrange方程，并通过实例说明在非惯性参照系中Lagrange方程的应用，从分析力学的角度提出了求解非惯性参照系中的动力学问题的一种方法。 相似文献
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根据振动和力学理论，推导了梁构件在正弦扰力作用下共振时，梁上各点动应力的计算公式，为梁构件理论和实际问题的研究提供了一个有用的工具。 相似文献
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《海外英语》2007,(5):10-11
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? 相似文献
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邱崇丙 《唐山师范学院学报》2014,(1):21-23
汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。 相似文献
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《海外英语》2007,(4):36
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. 相似文献
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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. 相似文献
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Rachel Zupek 《海外英语》2007,(11):40-41
我们绝大部分人都同意一件事情——我们喜欢金钱。但是你对金钱的喜欢之情足够到让你创立一份事业么?.财富通常被人忽视,主要在于人们不能真正了 相似文献
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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. 相似文献
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RUZBEHANI Mohsen 《重庆大学学报(英文版)》2004,3(1):20-25
1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec… 相似文献