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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Breakthrough Propulsion Physics Program ： ウィキペディア英語版 Breakthrough Propulsion Physics Program The Breakthrough Propulsion Physics Project (BPP) was a research project funded by NASA from 1996 through 2002, to study various proposals for "revolutionary" methods of spacecraft propulsion which would require breakthroughs in physics before they could be realized, hence the name. During its six years, this program was funded with a total investment of $1.2 million. == Diametrical == The diametric drive was a speculative proposal for an "engine" which would create a non-conservative gravitational field with non-zero curl. It was argued that in such circumstances, the side of the field which creates more force on the spacecraft will accelerate the spacecraft in the direction of the force. One idea for realizing this concept involved hypothetical particles with negative mass, originally proposed by Robert Forward and Jamie Woodward. If one were to construct a block of negative mass, and then attach it to a normal "positive" mass, the negative mass would fall towards the positive as does any mass toward any other. On the other hand, the negative mass would generate "negative gravity", and thus the positive mass (the spaceship itself generally) would fall ''away'' from the negative mass. If arranged properly, the distance between the two would not change, while they continued to accelerate forever. It has been argued that stability issues might arise. The concept is illustrated according to Millis by : :$V\; =\; (-m)\; \backslash begin\backslash frac$ $+\; (\; +\; m)\; \backslash begin\backslash frac$ where : :$V\backslash !$ is the gravitational scalar potential :$G\backslash !$ is Newton's gravitational constant :$m\backslash !$ is normal mass :$d\backslash !$ is distance == Disjunction == By disjunction is meant the separation of the source of a field from the matter with which it would otherwise interact; viz., under normal physical states. According to a summary of speculative propulsion ideas on NASA's website The concept is expressed mathematically〔Marc.G.Millis - Retrieved 2012-01-25〕 as : :$V\; =\; \backslash frac\; +\; 1)\; (-\; G(m/r))$ and $V\; =\; (-\; Gm)/r)\; +\; (\; -\; xAe\; ^)$ respectively. where : :$e^$ is the ''Gaussian distribution'' over $r\backslash !$ dimensionless :$A\backslash !$ is the magnitude of hypothetical pitch drive effect :$B\backslash !$ is the magnitude of hypothetical bias drive effect 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Breakthrough Propulsion Physics Program」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.