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导轨直线度速算尺的应用
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作者 田春雨 《制造技术与机床》 CSCD 北大核心 1998年第6期28-29,共2页
生产现场对大型、重型机床床身导轨的调整中,使用作者设计的导轨直线度速算尺可以使导轨检测后的数据处理简捷、快速,其精度与作图法相同。文章介绍了该尺的结构和使用方法。
关键词 导轨直线度 速算尺 机床
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正视官位
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作者 张英林 《新长征》 北大核心 1996年第9期45-45,共1页
正视官位张英林分别多年的老朋友、旧同事相逢,难免要畅叙别后生活收获,也常常会谈起哪位青云得步,地位令人仰目,哪位工作多年,连个副股级都没混上,似乎枉活。这种议论经常能听到,仿佛官位成了走仕途的朋友们衡量人生成败得失的... 正视官位张英林分别多年的老朋友、旧同事相逢,难免要畅叙别后生活收获,也常常会谈起哪位青云得步,地位令人仰目,哪位工作多年,连个副股级都没混上,似乎枉活。这种议论经常能听到,仿佛官位成了走仕途的朋友们衡量人生成败得失的一把速算尺。我对此论不敢全信,因为... 展开更多
关键词 岗位学雷锋 孙中山 速算尺 顺子 妇产科医生 经世济民 公安局长 明朝末年 穿戴整齐 终极目的
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The Domino Effect
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作者 Egor Kotelnikov 《Journal of Physical Science and Application》 2012年第6期195-199,共5页
A row of dominoes which stand on edge will undergo a cascade when the first domino is tipped. First domino strokes the next and the wave of falling dominoes propagates. The purpose of this work is to investigate wave ... A row of dominoes which stand on edge will undergo a cascade when the first domino is tipped. First domino strokes the next and the wave of falling dominoes propagates. The purpose of this work is to investigate wave speed dependence on various domino parameters as the number of elements and the distance between dominoes and their dimensions. Theoretical examination of falling dominoes process is to create the mathematical model of the process and compare between the calculations and experimental results. An experiment with using of the speed camera was made. The dominoes of three different types of material were used. For theoretical investigation of the problem, the model [1] was used. The program for computer calculations was written. Time of a dominoes row falling was calculated without taking friction between neighbours. The calculation results show that the speed of falling dominoes reaches its constant value. This stable velocity depends on the geometric parameters of dominoes and the surface friction between dominoes but does not depend on the mass of dominoes. 展开更多
关键词 Dominoes domino wave domino mechanics.
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