滁州市会峰大厦桩基垂直静荷载试验研究     

黄永浩  秦厚慈  沈国英 《安徽地质》1998,(1)

本文根据滁州市会峰大厦人工挖孔扩底桩的垂直静荷载试验成果,分析研究了滁州市红砂岩地基嵌岩桩的荷载有受力特征。  相似文献   

试论工程场地砂土液化的综合评判——以福-泉高速公路长乐营前三汊港特大桥为例     

黄莉菁  王善雄 《福建地震》1998,(2)

本文以对营前特大桥桥位区的砂土液化的综合评判为例子,提出砂土液化必须运用定值准则的概念与方法并结合各种宏观液化势判定手段进行综合评判,文中还针对水下孔的水位取值进行了讨论。  相似文献   

在97.8GHz处测量地球大气的不透明度     

杨戟  曹逸庭 《天文学报》1998,39(3):333-336

用研制的全自动辐射计在97．8GHz上测量南京市内大气的不透明度以及这种不透明度随时间的变化．辐射计记录大气在不同天顶高度的辐射温度,由此测出天顶方向的大气不透明度。在56小时的测量时间内,取得了1400多组数据,拟合得到了在观测时段内天顶方向的大气不透明度在0．2至0．7之间,典型值为0．4,表明测试地点的大气条件允许进行3mm波段的射电天文观测．由于在工作频段内大气不透明度的主要来源是对流层水汽的吸收,测量的不透明度可用来直接反映大气内水汽的含量,并实时校准大气吸收．  相似文献   

Enhanced Star Formation in Seyfert 2 Galaxies     

Q.-S. Gu  J.-H. Huang  L. Ji 《Astrophysics and Space Science》1998,260(3):389-396

In this paper, we report our preliminary results on enhanced star formation activity in Seyfert 2 galaxies. By re-analysing the Tully-Fisher relation for Whittle's (1992) sample and for a Seyfert 2s' sample selecting from Veron-Cetty and Veron (1996), we find that (1) almost all Seyfert 2 galaxies with circumnuclear star formation have a ratio of far infrared (FIR) to blue luminosities (L_FIR/L_B) to be larger than 1/3; (2) for Seyfert 2 galaxies with L_FIR/L_B > 1/3, the Tuly-Fisher relation is similar to that of the normal spiral galaxies; while for those with L_FIR/L_B ≥ 1/3, they are significantly different from the normal ones, which confirms Whittle's suggestion of enhanced star formation activities in the circumnuclear regions of these Seyfert 2 galaxies. This revised version was published online in July 2006 with corrections to the Cover Date.  相似文献   

上新世湖相纹泥及其环境信息与时间标尺记录   总被引：6，自引：3，他引：3       下载免费PDF全文

曹家欣  黄润华  石宁  罗运利 《第四纪研究》1998,18(4):351-359

纹泥反映了湖相沉积物中特有的沉积韵律,是气候的季节变化和年际变化的产物。山西榆社张村地区上新世晚期的湖心相沉积中发育了极为完好的纹泥剖面。纹泥深浅相间形成清晰的纹理,分别代表夏秋和冬春。一深一浅组成一对,代表一年。纹泥层的单层厚度平均为0．12～0．25mm／条,薄者＜0．1mm／条,厚者可达0．3mm／条。暗色纹泥层的厚度大于浅色纹泥层。暗色纹泥的有机质含量丰富,木本植物孢粉占优势,同时CaO的含量低;浅色纹泥恰好相反。湖相纹泥具有建立高分辨率时间标尺和环境演化序列的特殊优越条件。  相似文献   

应用嵌套模式研究梅梁湖区风生流   总被引：3，自引：0，他引：3       下载免费PDF全文

黄群  姜加虎 《水科学进展》1998,9(1):65-69

应用数值嵌套模式,研究不同风向情况下,梅梁湖与竺山湖之间的马山区围垦对梅梁湖风生流的影响。结果表明:风场作用初期,偏Ｓ风使得太湖湖水流入梅梁湖;偏Ｎ风使得梅梁湖湖水流入太湖。梅梁湖稳定风生流流态表现为:在S、E风作用下形成逆时针环流;在N、W风作用下形成顺时针环流。马山区围垦阻隔了梅梁湖与竺山湖之间的湖水交换,进而影响梅梁湖的风生流流态,导致其湖水更新速度减慢。  相似文献   

关于推行岩土工程专业体制的思考与实例     

黄晶莹 《湖南地质》1998,17(3):174-177

岩土工程专业体制的核心内涵,是强调岩土工程勘查,设计,施工,监测,监理５个环节的整体和统一性。岩土工程师,不仅要为建设工程设计提供地质资料,而且还要积极参与或争取主持整个岩土工程项目的设计与施工,本文以实例阐明了其可能性与必要性。  相似文献   

Gamma-ray bursts: post-burst evolution of fireballs   总被引：3，自引：0，他引：3  

Y. F. Huang  Z. G. Dai  D. M. Wei  & T. Lu 《Monthly notices of the Royal Astronomical Society》1998,298(2):459-463

The post-burst evolution of fireballs that produce γ-ray bursts (GRBs) is studied, assuming the expansion of fireballs to be adiabatic and relativistic. Numerical results as well as an approximate analytic solution for the evolution are presented. Owing to the adoption of a new relation between t R and γ, our results differ markedly from previous studies. Synchrotron radiation from the shocked interstellar medium is carefully calculated, using a conventional set of equations. The observed X-ray flux of GRB afterglows can be reproduced easily. Although the optical afterglows seem much more complicated, our results can still present a rather satisfactory agreement with observations. We also find that the expansion will no longer be highly relativistic about 4 d after the main GRB. We thus suggest that the marginally relativistic phase of the expansion should be investigated so as to check the afterglows observed a week or more later.  相似文献   

Three-dimensional air pollutant modeling in the lower atmosphere     

Gour-Tsyh Yeh  Chin-Hua Huang 《Boundary-Layer Meteorology》1975,9(4):381-390

A steady-state, three-dimensional turbulent diffusion equation describing the concentration distribution of an air pollutant from an elevated point source in the lower atmosphere is solved analytically. The same formulation can be used to obtain solutions from line, area or other kinds of sources. The solution is developed for the cases in which the velocity, vertical and lateral diffusivities are given by the power law. The model preserves the beauty of analytical solution without sacrificing much on the accuracy of approximating the velocity and eddy diffusivities. Methods of evaluating the parameters, which are required for the model applications, are discussed. Results indicate that the ratio of the plume width to the plume length increases with decreasing stability and with increasing source height. These consequences are in response to the variations of the size of eddies in the vertical direction.  相似文献   

关于电离层A-H公式的推广          下载免费PDF全文

黄信榆 《地球物理学报》1980,23(2):139-143

从简化的电子运动方程出发,通过电子等效碰撞频率的修正因子依赖于介质电导率张量的假设,推导出弱电离气体折射指数的一个初等函数推广表达式。其结果与sen-Wyller公式近似,计算则简单得多。  相似文献