共查询到20条相似文献,搜索用时 15 毫秒
1.
2.
Naylor R 《Isis; an international review devoted to the history of science and its cultural influences》2007,98(1):1-22
The aim of Galileo's tidal theory was to show that the tides were produced entirely by the earth's motion and thereby to demonstrate the physical truth of Copernicanism. However, in the Dialogue Concerning the Two Chief World Systems Galileo did not explain some of the most significant aspects of the theory completely. As a consequence, the way the theory works has long been disputed. Though there exist a number of interpretations in the literature, the most widely accepted are based on ideas that are not explicitly articulated by Galileo in the Dialogue. This essay attempts to understand the way the theory functions in terms of Galilean physics. It is an interpretation of the theory based solely on Galileo's arguments--and one that reveals it to have had some unrecognized consequences. This interpretation indicates that Galileo's theory would not have worked in the manner he described in the Dialogue. 相似文献
3.
4.
5.
A.W. Simon 《Journal of The Franklin Institute》1944,237(3):177-196
A summary is given of the general quantitative theory of electrostatic generators in the final, simplified form, as progressively developed by the author in a number of previous papers. The method is illustrated by detailed application to (1) a four carrier, bisymmetric replenisher, (2) a six carrier, trisymmetric replenisher, (3) a four carrier, four symmetric, electrostatic alternator, and (4) a four carrier, bisymmetric, constant potential electrostatic generator. Various artifices for simplifying and shortening the labor of mathematical solution are given. 相似文献
6.
Karl Heumann 《Journal of The Franklin Institute》1875,100(6):419-423
7.
波特跨国公司理论及启示 总被引:1,自引:0,他引:1
战略管理的发展,促使跨国公司的研究从对外直接投资的动因转移到跨国公司竞争战略的制订和竞争优势的获取。主要介绍迈克尔·波特教授的贡献以及其理论对中国企业跨国经营的意义。 相似文献
8.
9.
Leonard Eisenbud 《Journal of The Franklin Institute》1951,251(2):231-246
The correlation distribution function for emissions of non-relativistic particles in two successive disintegrations of a system is calculated without the use of perturbation theory and without particular assumptions for the nature of the “interactions” responsible for the transitions. The calculation is limited to transitions with the emission of only one particle (or more precisely, the disintegration of a quasi-stationary system into two sub-systems). Some general properties of correlation distribution functions are obtained. Also the number of undetermined parameters which enter the distribution function is counted under important restricting conditions. The form of the calculation makes possible the exhibition of the formal identity of the correlation distribution function with the angular distribution function for resonance reactions. Both distribution functions may be represented as polynomials in cost B of degree not greater than J, where J is the spin of the intermediate states of the two processes. 相似文献
10.
This study describes theory and methods for developing detonation-driven shock tunnels in hypervelocity test facilities. The primary concept and equations for high-enthalpy shock tunnels are presented first to demonstrate the unique advantage of shock tubes for aerodynamic ground-based testing. Then, the difficulties in simulating flight conditions in hypervelocity shock tunnels are identified, and discussed in detail to address critical issues underlying these difficulties. Theory and methods for developing detonation drivers are proposed, and relevant progress that has advanced the state of the art in large-scale hypersonic test facilities is presented with experimental verifications. Finally, tailored conditions for detonation-driven shock tunnels are described, laying a solid foundation to achieve long test duration. This interface-matching key issue encountered in developing shock tunnels has been investigated for decades, but not solved for detonation drivers in engineering applications. 相似文献
11.
Lewis M. Haupt 《Journal of The Franklin Institute》1887,124(4):264-272
12.
13.
14.
15.
16.
17.
18.
论科学评价理论研究的发展趋势 总被引:2,自引:0,他引:2
论述目前科学评价活动出现的一些新动向,认为科学评价理论研究正呈现出一些较为明显的新的发展趋势:科学评价理论的整合研究、科学评价理论研究的国际融合、知识评价研究、网络科学评价研究、科学评价学学科研究和科学评价文化研究等。 相似文献
19.
The fixed end-point problem in variational calculus for an extremal containing corners is considered in a distributional context. The distributional Euler equation obtained is valid over the entire extremal and implicitly contains the Weierstrass-Erdmann corner conditions. 相似文献