共查询到10条相似文献,搜索用时 140 毫秒
1.
宇宙线对地球气候的影响 总被引:4,自引:2,他引:2
对宇宙线影响地球气候的一些观测结果和物理机制的研究进行了总结和概述,主要讨论了宇宙线对大气中化学反应、云形成过程等的影响,并给出了羊八井宇宙线观测站对宇宙线流强和大气参量日变化的初步观测结果. 相似文献
2.
In this paper,we investigate some exact soliton solutions for a generalized variable-coefficients nonlinear Schrdinger equation (NLS) with an arbitrary time-dependent linear potential which describes the dynamics of soliton solutions in quasi-one-dimensional Bose-Einstein condensations. Under some reasonable assumptions,one-soliton and two-soliton solutions are constructed analytically by the Hirota method. From our results,some previous one-and two-soliton solutions for some NLS-type equations can be recovered by some appropriate selection of the various parameters. Some figures are given to demonstrate some properties of the one-and the two-soliton and the discussion about the integrability property and the Hirota method is given finally. 相似文献
3.
Roberto Beneduci 《International Journal of Theoretical Physics》2011,50(12):3724-3736
In the present paper, we review some recent results about commutative positive operator valued measures (POVMs) and single
out some open problems. We introduce a conjecture about the extension of some recent results and prove some important consequences
of such conjecture. In particular, we prove that it implies the universal character of some of the mathematical objects we
introduce, i.e., the fact that they do not depend on the POV measure we are considering. We analyze the relevance of this
result. Finally, we point out that some of the results we present admit a constructive proof and we show the relevance of
this fact to the theory of commutative POV measures. 相似文献
4.
Conditional Similarity Solutions of (2+1)—Dimensional General nonintegrable KdV Equation 总被引:1,自引:0,他引:1
TANGXiao-Yan LOUSen-Yue 《理论物理通讯》2002,37(2):139-144
The real physics models are usually quite complex with some arbitrary parameters which will lead to the nonintegrability of the model.To find some exact solutions of a nonintegrable model with some arbitrary parameters is much more difficult than to find the solutions of a model with some special parameters.In this paper,we make a modification for the usual direct method to find some conditional similarity solutions of a (2 1)-dimensional general nonintegrable KdV equation. 相似文献
5.
非线性热声理论的研究进展 总被引:4,自引:0,他引:4
主要总结了热声系统中的非线性热声现象,指出了线性热声理论的不足,回顾了近十年来国内外热声工作者为解释这些非线性现象所做的理论探索,对其发展方向进行了展望. 相似文献
6.
光学系统偏心测量原理及应用 总被引:6,自引:1,他引:5
综述了光学系统偏心测试研究方面的发展概况及目前所达到的水平。简要介绍了光学系统偏心测量及基准轴变换原理,并讨论了一些必要的问题。最后介绍了测量方法的一些具体应用,指出了一些测量中应注意的问题和技巧,并介绍了几个具有代表性的,经过多年实践创造出来的应用方法实例。 相似文献
7.
8.
酸性条件下染料结晶紫分子的近红外表面增强拉曼散射研究 总被引:1,自引:0,他引:1
比较了染料分子结晶紫(CV)在酸性与中性条件下的金胶体系中的近红外表面增强拉曼光谱(NIR-SERS)。结果表明,结晶紫分子-金胶体系中结晶紫分子在1064nm近红外光激发条件下,其荧光得以大大淬灭,同时拉曼得到了至少不低于105倍的增强;当进一步加入硝酸使得其处于酸性气氛下时,由于部分结晶紫分子与硝酸发生了化学作用形成了结晶紫分子的单替代衍生物(HCV),而HCV与结晶紫分子相比,更容易吸附在金属表面,因此结晶紫分子NIR-SERS还将有很大的增强。这可以给我们很大的启示:改变体系的酸碱度也可以达到改变其SERS的增强效果的目的。 相似文献
9.
In the present work we analyze the possibility of detecting some deformed dispersion relations, emerging in some quantum-gravity models, resorting to the so-called Hanbury–Brown–Twiss effect. It will be proved that in some scenarios the possibilities are not pessimistic. Forsooth, for some values of the corresponding parameters the aforementioned effect could render interesting outcomes. 相似文献