混合菌种对地下水中三氯乙烯的生物降解和吸附解吸的实验研究

由于氯代有机溶剂的大量使用和不合理的处置 ,致使三氯乙烯 (以下简称TCE)成为地下水中常见的有机污染物。本实验以TCE为靶污染物 ,采用批试验方法 ,研究了灭菌后的混合菌种对不同浓度TCE的吸附影响。实验结果表明 :当TCE浓度在 10～ 2 0 0mg l范围内 ,TCE的吸附模式符合Cs =0 17976C2 36 39e 等温方程 ;TCE的解吸模式符合C =0 0 2 987C2 1 46 1 e 等温方程 ;吸附在 15min内平衡 ;解吸在 1h内平衡。     

地震波走时计算的逆风差分算法

快速精确地旅行时计算在地震资料的叠前偏移与层析反演中起重要作用。利用逆足差分格式求解程函方程，首先在波阵面上寻找全局极小点，然后计算该点周围各点的地震波初至走时，同时，采用局部算法以确保计算的稳定性。该算法对于任意复杂地质模型都具有较高的精度。     

关于网外地震的定位问题--利用福建区域数字地震台网资料测定台湾地震震源位置

针对地壳内部的网外地震震源的定位问题，由震相组合成不同的方程组，利用均值寻查定位法迭代求解。在选取地球物理参数模型时，考虑了台湾地震部门定位时所用的模型和华南地区地震走时表等。利用福建数字地震台网记录到的绕射波Pn、Sn的到时资料，通过定位程序测定了134个位于台湾区域的壳内地震的震源位置。测定结果与台湾地震部门在其网址上公布的结果进行比对．平均震中位詈相差9km．震源深度相差8km．     

Arbitrary Difference Precise Integration Method for Solving the Seismic Wave Equation

Wave equation migration is often applied to solve seismic imaging problems. Usually, the finite difference method is used to obtain the numerical solution of the wave equation. In this paper, the arbitrary difference precise integration (ADPI) method is discussed and applied in seismic migration. The ADPI method has its own distinctive idea. When dispersing coordinates in the space domain, it employs a relatively unrestrained form instead of the one used by the conventional finite difference method. Moreover, in the time domain it adopts the sub-domain precise integration method. As a result, it not only takes the merits of high precision and narrow bandwidth, but also can process various boundary conditions and describe the feature of an inhomogeneous medium better. Numerical results show the benefit of the presented algorithm using the ADPI method.     

某双曲线冷却塔施工放线测量

结合某双曲线冷却塔施工测量工作，介绍了在测量新技术条件下复杂建筑的施工测量方法和技术。     

新疆春季气温异常的区域特征

利用新疆52个测站1961～2000年3～5月逐日平均气温资料，采用旋转经验正交展开（REOF）方法对新疆春季气温场进行客观分区，分析了各区域春季气温的不同时间尺度变化趋势。结果表明：新疆春季气温场可分为3个区域，北疆区和南疆区的长期变化呈下降趋势，而东疆区呈上升趋势；各区域存在明显不同的年际、年代际方差构成和多尺度振荡周期。     

he dependence of response spectrum on the tectonic ambient shear stress field

It has been analyzed the influence of the tectonic ambient shear stress value on response spectrum based on the previous theory. Based on the prediction equation BJF94 presented by the famous American researchers, CLB20, a new prediction formula is proposed by us, where it is introduced the influence of tectonic ambient shear stress value on response spectrum. BJF94 is the prediction equation, which mainly depends on strong ground motion data from western USA, while the prediction equation SEA99 is based on the strong ground motion data from extensional region all over the world. Comparing these two prediction equations in detail, it is found that after BJF94's prediction value lg(Y) minus 0.16 logarithmic units, the value is very close to SEA99's one. This case demonstrates that lg(Y) in extensional region is smaller; the differences of prediction equation are mainly owe to the differences of tectonic ambient shear stress value. If the factor of tectonic ambient shear stress value is included into the prediction equation, and the magnitude is used seismic moment magnitude to express, which is universal used around the world, and the distance is used the distance of fault project, which commonly used by many people, then regional differences of prediction equation will become much less, even vanish, and it can be constructed the universal prediction equation proper to all over the world. The error in the earthquake-resistant design in China will be small if we directly use the results of response spectrum of USA (e.g. BJF94 or SEA99).     

A varying time-step explicit numerical inte-gration algorithm for solving motion equa-tion

Introduction In linear elastic medium,motion equation for lumped-mass finite element simulation of wave motion is expressed as(LIAO,2002)∑=+lililii ttGtM)()()(FUU&&(1)where Mi is lumped-mass at node i,Gil is stiffness coefficient of node i with respect to node l,üi(t)is acceleration vectors at node i,Ul(t)is displacement vectors at node l,Fi(t)is the external nodal force vectors acting at node i.If acceleration vectorsüi(t),displacement vectors Ul(t)and the external nodal force vectors…     

地应力与巷道布置关系的理论研究

初始地应力是地下工程围岩稳定与支护结构设计的一个基本参数。介绍了地应力计算原理 ,并根据矿井实测地应力资料 ,分析了初始地应力场与巷道布置及巷道破坏形式的关系。为今后选择巷道掘进方向和改进巷道支护方案提供了依据。     

Decoupling Conditions for Elasto-plastic Consolidation Question Based on Numerical Modeling Method

INTRODUCTION Theconsolidationofsaturatedsoilisanimpor tantsubjectingeomechanics.Biot(1941)proposed thethree dimensionalconsolidationtheory,whichis basedontheprincipleofeffectivestress,continuity conditionsandequilibriumequations.Theremarka blesuccessofthistheoryistheanalysisofthetime dependenteffectandcouplingeffectofsoilandpore water.Thus,thetheoryisaclassictheoryinsatu ratedsoilstatistics.Itwasalmostunfeasibletoperformanalysesof thistheorywithoutthedevelopmentofhigh speed computersandnu…