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《昆明师范高等专科学校学报》2014,(6)
采用实验方法研究了一类竖直悬挂的弹簧质量系统沿水平方向的自由振动,观察到振动周期随振幅及弹簧悬点高度的增加而减小.数据分析发现,采用等效质量方法考虑弹簧质量的影响后,非线性振动理论模型所得结果与实验数据吻合,但弹簧质量系统的等效质量系数小于该系统进行简谐振动时的等效质量系数,且与弹簧的最大拉伸长度有关. 相似文献
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本文推导了弹簧质量与弹簧振子振动周期的关系，计算出了弹簧振子在气轨上振动周期由于弹簧质量而带来的系统误差。 相似文献
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某杂志中有关《非轻质弹簧问题的分析》一文推得“一质量为m的弹簧与物体M（视为质点）组成的一个‘弹簧振子’，弹簧振子的振动周期为T=2xM＋m/2/k”的结论， 相似文献
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采用理论分析及数值计算方法研究了一类弹簧质量系统在水平面上的运动,得出系统参数及振幅对该类系统非线性周期振动性质的影响规律,丰富了非线性振动的研究. 相似文献
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从有质量弹簧的波动方程出发，运用牛顿第二定律和胡克定律及微元分析法，给出定解问题；然后分离变量，直接求解波动方程，得到分离变数形式的解和频率ω所满足的本征值方程；再将tanω/ωn。展开成麦克劳林(Machlaurin)级数形式，井采用迭代法解出弹簧振子的本征频率，导出弹簧的有效质量的渐近级数表达式；最后由初始条件解出其对应的振幅，得到弹簧质量不可忽略的弹簧振子系统的振动解． 相似文献
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弹簧振子周期经验公式的研究 总被引：1，自引：0，他引：1
吴贤俊 《四川教育学院学报》2003,19(5):69-70
通过对弹簧的有效质量的分析，提出了有效质量在弹簧振子周期经验公式研究中是不可忽略的。并对现用实验讲义《物理实验简明教程》中的该实验进行了改进，从而提高了实验精度。 相似文献
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结合第50届国际奥林匹克物理竞赛试题,介绍有质量零长度弹簧及其相关问题的处理方法,包括静止状态下质量对弹簧形变量的影响、下落过程中弹簧运动速度及能量相关问题的处理.从试题考查与试题命制的角度分析试题的特点,并指出值得同行关注和借鉴之处. 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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罗艳萍 《读与写:教育教学刊》2008,5(6)
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. 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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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
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Richard Denner 《海外英语》2007,(4):14-15
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. 相似文献