期刊文献+
共找到4篇文章
< 1 >
每页显示 20 50 100
质点组动量守恒中的速度问题
1
作者 胡全连 《江西教育学院学报》 2001年第6期26-27,共2页
利用动量守恒定律分析质点组问题时,必需注意质点组各质点速度的空间统一性和时间统一性。
关键词 质点组 动量守恒 速度 空间统一性 时间统一性
下载PDF
地缘战略区与地缘政治区 被引量:2
2
作者 S.B.科恩 李珮 《人文地理》 CSSCI 1991年第1期72-77,43,共7页
过去的全球战略观,一直强调战略的空间统一性,这种空间统一性是通过单一的运动舞台来实现的.由公路和铁路系统而建立的大陆块的统一性是陆心战略的基础.由水运系统而建立的海洋统一性则是陆缘和北大西洋战略的基础.由轰炸机和导弹而建... 过去的全球战略观,一直强调战略的空间统一性,这种空间统一性是通过单一的运动舞台来实现的.由公路和铁路系统而建立的大陆块的统一性是陆心战略的基础.由水运系统而建立的海洋统一性则是陆缘和北大西洋战略的基础.由轰炸机和导弹而建立的空中统一性是北极战略的基础,正是由于这一战略的提出,才使整个陆地和海洋的作用显得无足轻重,从而使人们认为一个大国,不管其所在陆地位置如何,只要它掌握空中优势,它就可以支配世界.这些全球战略的基本前提是。 展开更多
关键词 地缘战略 地缘政治 空间统一性 战略观 破碎区 北大西洋 海洋 贸易 世界 欧亚大陆
下载PDF
A Unified Symmetry of Mechanical Systems with Variable Mass in Phase Space
3
作者 WANG Peng FANG Jian-Hui ZHANG Peng-Yu, DING Ning 《Communications in Theoretical Physics》 SCIE CAS CSCD 2006年第3X期385-388,共4页
In this paper, the definition and the criterion of a unified symmetry of the mechanical system with variable mass in phase space are given. The Noether conserved quantity, the generalized Hojman conserved quantity, an... In this paper, the definition and the criterion of a unified symmetry of the mechanical system with variable mass in phase space are given. The Noether conserved quantity, the generalized Hojman conserved quantity, and Mei conserved quantity deduced from the unified symmetry are obtained. An example is given to illustrate the application of the results. 展开更多
关键词 phase space variable mass system unified symmetry conserved quantity
下载PDF
Geometry Is the Common Thread in a Grand Unified Field Theory
4
作者 Olaniyi S. Maliki 《Journal of Physical Science and Application》 2017年第4期38-46,共9页
The consequence of the wave-particle duality is a pointer to the fact that everything in the universe, including light and gravity, can be described in terms of particles. These particles have a property called spin. ... The consequence of the wave-particle duality is a pointer to the fact that everything in the universe, including light and gravity, can be described in terms of particles. These particles have a property called spin. What the spin of a particle really tells us is what the particle looks like from different directions, in other words it is nothing more than a geometrical property. The motivation for this work stems from the fact that geometry has always played a fundamental role in physics, macroscopic and microscopic, relativistic and non-relativistic. Our belief is that if a GUT (Grand Unified Theory) is to be established at all, then geometry must be the common thread connecting all the different aspects of the already known theories. We propose a new way to visualize the concept of four-dimensional space-time in simple geometrical terms. It is observed that our time frame becomes curved, just as the space-frame, in the presence of a massive gravitating body. Specifically, in the event horizon of a black hole, where time seems to grind to a halt for external observers, the time frame appears to curve in on itself, forming an imaginary loop. This results in extreme time dilation, due to the strong gravitational field. Finally we adopt a descriptive view of a GUT called Quantum Necklace GUT which attempts to connect gravity together the other three fundamental forces of nature, namely the strong, weak and electromagnetic interactions. 展开更多
关键词 GUT GEOMETRY SPACE-TIME spin RELATIVITY Einstein field equations.
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部