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计算技术经由传教士期刊在晚清的传播
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作者 宋轶文 姚远 《西北大学学报(自然科学版)》 CAS CSCD 北大核心 2012年第6期1042-1048,共7页
目的旨在廓清晚清计算技术经由传教士期刊在中国的传播源流。方法检索近代期刊史料确认《六合丛谈》和《格致汇编》在传播计算技术方面的代表性和开创性,然后进行原始期刊文献分析考证。结果 1857年1卷2期《六合丛谈》所刊《新造算器》... 目的旨在廓清晚清计算技术经由传教士期刊在中国的传播源流。方法检索近代期刊史料确认《六合丛谈》和《格致汇编》在传播计算技术方面的代表性和开创性,然后进行原始期刊文献分析考证。结果 1857年1卷2期《六合丛谈》所刊《新造算器》一文最早在期刊上将使用线性差分法计算整数乘方运算的差分机原理传入中国。1876年1卷1期《格致汇编》所刊《算器图说》一文对最早引入中国的西方机械计算器作了介绍,详细说明了该计算器的构造、使用方法及用途。1890年5卷2期《格致汇编》所刊《新式算器图说》一文在回顾前文的同时又介绍了两种改良型的新式计算器。结论《六合丛谈》和《格致汇编》在早期传入欧洲计算技术,表明期刊是书籍之外传播最新科技成果的另一主媒介;晚清中国引进西方计算器,表明中国的科学计算由纯粹的手工推步拨算步入了机械计算的时代,同时计算器在天文观测计算等领域的首先使用也再次表明直到晚清,数学和天文历算仍然是引领中西科学交融的前沿。 展开更多
关键词 《六合丛谈》(1857--1858) 《格致汇编》(1876--1892) 机械计算器 巴贝奇(chares Babbage 1792--1872) 许茨(George Scheutz 1785-1873) 贾步纬(1840--1903)
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Motion Equation and Solution of Mushroom Cloud 被引量:1
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作者 Tianquan Yun 《Atmospheric and Climate Sciences》 2021年第1期86-97,共12页
Using model like hot air bloom with zero-weighted membrane wrapped hot air, surrounded by cold air, this paper sets up a partial differential equation (PDE) of motion of mushroom cloud by modifying Navier-Stokes (N-S)... Using model like hot air bloom with zero-weighted membrane wrapped hot air, surrounded by cold air, this paper sets up a partial differential equation (PDE) of motion of mushroom cloud by modifying Navier-Stokes (N-S) equations. The obtained equation is a vector PDE. It states that the derivative of velocity is with respect to time proportions to the gradient of temperature with respect to trace. Its solution is obtained by the method of separating variables for scalar function. These results have been compared with well agreement with literatures. Highlight: The Principle of Minimum Energy Release (PMER) is used to prove the pulse-mode of explosion of nuclear weapon, as great Earthquake, and optimum path problems. 展开更多
关键词 A-Bomb H-Bomb Mushroom Cloud Boyles Law chares Law Mass-Energy Equation Gravity-Buoyancy Field Principle of Minimum Energy Release Principle of Reciprocal Displacement N-S Equations
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Nuclear fragmentation at 4.5 a GeV/c in 28Si with emulsion interactions
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作者 A. Abd El-Daiem A. Abdel-Hafiez M. A. Khalifa 《Natural Science》 2011年第5期408-413,共6页
The experimental results of complete charge distribution of projectile fragments (PFS) and the total charge of the projectile fragments (PFS ) are presented. Also the multiplicity distributions of (PFS) and the rapidi... The experimental results of complete charge distribution of projectile fragments (PFS) and the total charge of the projectile fragments (PFS ) are presented. Also the multiplicity distributions of (PFS) and the rapidity distribution of shower tracks produced from events with nh = 0 from 28Si with emulsion at 4.5 A GeV /c are obtained. 展开更多
关键词 MULTIPLICITY DISTRIBUTION Total Chare and RAPIDITY DISTRIBUTION
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