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我国公共产品生产方式及其选择
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作者 庞珂 吴佩旆 《计划与市场探索》 2003年第5期15-16,共2页
随着经济的发展,社会对公共产品质量和数量的要求越来越高。本文概述了我国公共产品生产方式的现状,同时介绍了选择公共产品最佳生产方式的若干方法。
关键词 中国 竞争性 非排斥性 纯公共产品 准公共产品
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The Necessary Existence of Gravitational Waves and the Repulsive Gravitation
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作者 C. Y. Lo 《Journal of Physical Science and Application》 2017年第3期1-14,共14页
It is exciting that the gravitational wave has been confirmed, according to the announcement of LIGO. Perhaps, this is the time for physicists to fix the Einstein equation for the gravitational wave and the nonexisten... It is exciting that the gravitational wave has been confirmed, according to the announcement of LIGO. Perhaps, this is the time for physicists to fix the Einstein equation for the gravitational wave and the nonexistence of the dynamic solution. These two problems are inextricably related. As a first step, theorists should improve their pure mathematics beyond Einstein on non-linear mathematics and related physical considerations. Then, theoretically we must first show that the gravitational waves necessarily exist that Einstein was not certain. We find that the existence of gravitational waves is due to that the photons must have a gravitational wave component. Next, we must rectify the Einstein equation that has no gravitational wave solution which Einstein has recognized, and no dynamic solution that Einstein failed to see. However, it is very questionable that the measured gravitational waves are due to the black holes that can be definitely valid due to the long distance of the sources. Moreover, since the repulsive gravitation can also generate a gravitational wave, the problem of gravitational wave is actually far more complicated than we have known. A useful feature of the gravitational wave based on repulsive gravitation is that it can be easily generated on earth. Thus this can be a useful tool for communication because it can penetrate any medium. 展开更多
关键词 Anti-gravity coupling gravitational radiation principle of causality.
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On the Well-Posedness for Stochastic Schrodinger Equations with Quadratic Potential
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作者 Daoyuan FANG Linzi ZHANG Ting ZHANG 《Chinese Annals of Mathematics,Series B》 SCIE CSCD 2011年第5期711-728,共18页
The authors investigate the influence of a harmonic potential and random perturbations on the nonlinear Schr6dinger equations. The local and global well-posedness are proved with values in the space ∑(R^n)={f E HI... The authors investigate the influence of a harmonic potential and random perturbations on the nonlinear Schr6dinger equations. The local and global well-posedness are proved with values in the space ∑(R^n)={f E HI(R^n), |·|f ∈ L^2(R^n)}. When the nonlinearity is focusing and L2-supercritical, the authors give sufficient conditions for the solutions to blow up in finite time for both confining and repulsive potential. Especially for the repulsive case, the solution to the deterministic equation with the initial data satisfying the stochastic blow-up condition will also blow up in finite time. Thus, compared with the deterministic equation for the repulsive case, the blow-up condition is stronger on average, and depends on the regularity of the noise. If φ = 0, our results coincide with the ones for the deterministic equation. 展开更多
关键词 Stochastic SchrSdinger equation WELL-POSEDNESS Blow up
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