紫阳滑坡治理工程实例分析     

刘满全 《地球科学与环境学报》1994,(2)

本文介绍紫阳骨坡治理工程中有关抗滑桩的设计与施工。文中详细地论述了设计中设计人员应根据工程的具体情况去灵活处理的一些技术问题，如确定有关参数的选择原则，计算上的条件简化和一些具体技术细节的处理方法等．  相似文献   

Optical Flash of GRB 990123: Constraints on the Physical Parameters of the Reverse Shock     

Yi-Zhong Fan  Zi-Gao Dai  Yong-Feng Huang  Tan Lu Department of Astronomy  Nanjing University  Nanjing 《中国天文和天体物理学报》2002,2(5):449-453

The optical flash accompanying GRB 990123 is believed to be powered by the reverse shock of a thin shell. With the best-fit physical parameters for GRB 990123 and the assumption that the parameters in the optical flash are the same as in the afterglow, we show that: 1) the shell is thick rather than thin, and we have provided the light curve for the thick shell case which coincides with the observation; 2) the theoretical peak flux of the optical flash accounts for only 3×10~-4 of the observed. In order to remove this discrepancy, the physical parameters, the electron energy and magnetic ratios, εe and εB, should be 0.61 and 0.39, which are very different from their values for the late afterglow.  相似文献   

黄土土性的空间自相关性研究     

倪万魁  牛富俊  刘东燕 《地球科学与环境学报》2002,24(2):4-8

运用土层的随机场模型研究了绛帐、潼关和延安黄土主要物理力学指标沿深度的统计规律,计算出黄土土性的自相关距离,探讨了黄土土性的空间变异性,结果认为:黄土的物理力学指标沿深度均是统计非均匀的,在实际工程的设计中,如果把土层看成统计均匀,其土性参数的标准差会比实际情况大,从而会导致较大的误差。  相似文献   

基于可靠度理论的黄土高边坡优化设计   总被引：11，自引：2，他引：9  

叶万军  折学森  陈志新  宋建华  邵铁全 《地球科学与环境学报》2005,27(2):82-85

对黄土高边坡进行可靠性分析，应用数学原理和优化原理，建立了黄土高边坡的优化模型，对铜黄一级公路黄土高边坡进行分析验证。结果表明，该方法计算的结果与实际较接近．应用中易操作。  相似文献   

激变变星0623＋71的光谱研究     

袁钧涛  李宗云 《天文学报》1996,37(3):235-242

本文提出了激变变星０６２３十７１的４个时间分辨光谱，覆盖轨道周期的７３％．其中的３个谱清楚地显示了各种光谱特征随轨道运动的变化，在流量、能谱以及谱线轮廓方面的这种变化正是对一个倾角不太大的激变变星所期望的．然而另一个曝光对分钟的谱，流量和视向速度与预期的相比都太大，很难加以解释，可能它是一次象ＡＥＡｑｒ中观测到的跃发事件．  相似文献   

1989年1月18日白光耀斑的研究     

姜云春 《云南天文台台刊》1996,(1):86-87

本文利用色球Ｈα单色光序列照相资料，Ｈα光谱扫描资料，黑子精细结构照相资料和日面纵向磁场观测资料，分析了１９８９年１月１８日ＷＬＦ所在活动区ＮＯＡＡ／ＵＳＡＦ：５３１２的磁场结构，黑子结构及该ＷＬＦ的演化特征，求出了视向速度场，并以理论计算的Ｈα谱线轮廓作为诊断工具，探讨了该ＷＬＦ可能的能量传输机制和动力学过程。  相似文献   

LAMOST/GALAXY计划:利用LAMOST研究银河系     

胡景耀 《天文研究与技术》2004,1(3):234-240

本文讨论了利用LAMOST作银河系研究的科学意义及可能性；并提出具体实施LAMOST/GAIAXY计划的初步方案。  相似文献   

秦岭及黄土区的栎林与发育气候     

《地球科学与环境学报》1996,(1)

  相似文献   

复杂模型重力位场快速正反演方法及应用     

李庆春  潘作枢 《地球科学与环境学报》1990,(4)

提要 本文详细讨论了一种三维重力位场快速正反演方法。作者在前人工作的基础上,对算法作了行之有效的改进,通过对反演中的不稳定因素进行各种理论模型试算,得出保证迭代反演稳定收敛的准则,编制出可在微型机IBM—PC上运行的人机对话式自动正反演程序。本文还对各种不均质模型进行了模似计算并将该方法应用于某含油气沉积盆地的双层界面构造研究,揭示出了储油有利地段。  相似文献   

Sequences in the Hardness Ratio-Peak Energy Plane of Gamma-Ray Bursts     

Xiao-Hong Cui  En-Wei Liang  Rui-Jing Lu National Astronomical Observatories/Yunnan Observatory  Chinese Academy of Sciences  Kunming  ciwei@.com Department of Physics  Guangxi University  Nanning Department of Astronomy  Nanjing University  Nanjing Graduate School of the Chinese Academy of Sciences  Beijing 《中国天文和天体物理学报》2005,5(2):151-158

The narrowness of the distribution of the peak energy of the vFv spectrum of gamma-ray bursts (GRBs) and the unification of GRB populations are great puzzles yet to be solved. We investigate the two puzzles based on the global spectral behaviors of different GRB populations, the long GRBs, the short GRBs, and the X-ray flashes (XRFs), in the HR - Ep plane (HR the spectral hardness ratio) with BATSE and HETE-2 observations. It is found that the long GRBs and the XRFs observed by HETE-2 seem to follow the same sequence in the HR-Ep plane, with the XRFs at the low end of this sequence. We fit the sequence by a universal Band function, and find that this sequence is mainly defined by the low energy index α, and is insensitive to the high energy index,β. With fixed β=-5, a best fit is given by α=-1.00 with X^2min/dof=2.2. The long and short GRBs observed by BATSE follow significantly different sequences in the HR-Ep plane, with most of the short GRBs having a larger hardness ratio than the long GRBs at a given Ep. For the long GRBs a best-fit yields α=-0.30 and β=-2.05. For the short GRBs, a best fit gives α=-0.60 with x^2min=1.1 (withβfixed at-2.0 because it is numerically unstable). The α value for the short GRBs is significantly greater than that for the long GRBs. These results indicate that the global spectral behaviors of the long GRB sample and the XRF sample are similar, while that of the short GRBs is different. The short GRBs seem to be a unique subclass of GRBs, and they are not the higher energy extension of the long GRBs.  相似文献