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镁带在空气中燃烧实验研究
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作者 徐建飞 张长江 《化学教学》 CAS 北大核心 2004年第7期6-6,5,共2页
关键词 中学 化学教学 镁带 空气 燃烧实验 《质量守恒定理》
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A Redemptive Analysis of Suffering
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作者 Daihyun Chung 《Journal of Philosophy Study》 2015年第10期530-536,共7页
The notion of suffering carries with it aspects which are private and individual on the one hand, and social and lingual on the other. I would pay attention to the latter part of the suffering notion, where the notion... The notion of suffering carries with it aspects which are private and individual on the one hand, and social and lingual on the other. I would pay attention to the latter part of the suffering notion, where the notion of suffering is recognized to be primitive by almost all the theories of human values. This primitive character allows a commensurable basis on the basis of which most plural theories share something in common to talk objectively to each other. In this paper, I would like to offer three arguments in order to advance a thesis that one's suffering is redemptive of others. First, the conservation law of mass says that matter of a closed system can neither be created nor destroyed, although it may be differently rearranged. This may be applied to the experience of suffering, to allow the conservation law of suffering: My unjust self-interest costs pains in others to the level of the same amount but if I voluntarily suffer a sacrifice, others will have their pains lightened to the analogous level. Second, notion of yin-yang helps to support the redemptive thesis of suffering. The notion says that all things in the reality consist of two complementary opposite Capacities that interact within a greater whole, as part of a dynamic system. Then, my acceptance of suffering and the decrease of other's pain are two complementary capacities of one reality. Third, any person is responsible for his own act, so is a society as a whole. Then, as an individual restores his damaged person, when he commits a crime, by being suffered or punished, a society restores itself to its own proper state, when any member of the society is wronged, by suffering communally in one way or other. 展开更多
关键词 SUFFERING redemptive CONSERVATION YIN-YANG RESPONSIBILITY SHARING SOLIDARITY
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Gravitational Energy-Momentum and Conservation of Energy-Momentum in General Relativity 被引量:1
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作者 吴兆颜 《Communications in Theoretical Physics》 SCIE CAS CSCD 2016年第6期716-730,共15页
Based on a general variational principle, Einstein–Hilbert action and sound facts from geometry, it is shown that the long existing pseudotensor, non-localizability problem of gravitational energy-momentum is a resul... Based on a general variational principle, Einstein–Hilbert action and sound facts from geometry, it is shown that the long existing pseudotensor, non-localizability problem of gravitational energy-momentum is a result of mistaking different geometrical, physical ob jects as one and the same. It is also pointed out that in a curved spacetime, the sum vector of matter energy-momentum over a finite hyper-surface can not be defined. In curvilinear coordinate systems conservation of matter energy-momentum is not the continuity equations for its components. Conservation of matter energy-momentum is the vanishing of the covariant divergence of its density-flux tensor field. Introducing gravitational energy-momentum to save the law of conservation of energy-momentum is unnecessary and improper. After reasonably defining "change of a particle's energy-momentum", we show that gravitational field does not exchange energy-momentum with particles. And it does not exchange energy-momentum with matter fields either. Therefore, the gravitational field does not carry energy-momentum, it is not a force field and gravity is not a natural force. 展开更多
关键词 pseudotensor non-localizability gravitational energy-momentum energy-momentum conservation
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