北疆棉区棉花膜下滴灌蒸散规律研究

通过对膜下灌溉技术下蒸散观测数据的分析，初步确定了棉花在整个生育期的蒸散量为500-600mm。在此基础上，分析了膜下灌溉技术对棉花产质量的影响。     

双侧破裂模型对地震动空间相关性影响的定量研究

本在震源为双侧线状断层破裂模型的假定下，根据震源理论和波谱随空间坐标的展开式，得到了场地两点地震动Fourier谱的表达式Ab(f)=Aa(f)exp(a1δ0 a2δθ，中提出了将双侧破裂模型分解为两个单侧破裂模型计算双侧破裂模型a1和a2的数值方法，以一次地震（M＝6）为例，分析了双侧破裂模型对地震动空间相关性的影响，计算了 a1和a2的实部和虚部以及孔径随震中距，方位角和频率变化的三维图像。     

用载炭泡塑吸附原子吸收法测定地质样品中金

为达到简便、快速、准确测Au的目的，以泡塑为载体负载一定量的活性炭制成载炭泡塑，研究标准回收、酸度、流速及干扰试验结果，制定用载炭泡塑吸附，火焰原子吸收法测定地质样品中Au的实验方法，对部级含Au标样进行精度分析，并将测定外检样品的结果与活性炭富集及泡塑吸附法的测定结果做对照，表明该法具有较好的精密度和准确度，检出限为0.1ug/g，适合地质样品中Au的测定。     

夯扩桩成桩过程引起的挤土效应分析

夯扩桩在成桩过程中会产生挤土效应。通过采用柱形孔扩张理论，推导出砂土中形成扩大头时引起的挤土影响半径和土体位移，并对一工程实例进行了分析。     

四川牦牛坪稀土矿床萤石REE配分模式的影响因素

四川牦牛坪稀土矿床萤石REE配分模式表现出明显变化的特征，本文从稀土离子半径和温度两个方面分析了影响矿区萤石配分模式的原因。结果表明：矿区萤石中LREE的配分模式主要受温度影响，而MREE、HREE主要受离子半径控制。     

Inelastic buildings with tuned mass dampers under moderate ground motions from distant earthquakes

The effectiveness of tuned mass dampers (TMD) in vibration control of buildings was investigated under moderate ground shaking caused by long‐distance earthquakes with frequency contents resembling the 1985 Mexico City (SCT) or the 1995 Bangkok ground motion. The elastic–perfectly plastic material behaviour was assumed for the main structure, with linear TMDs employed by virtue of their simplicity and robustness. The accumulated hysteretic energy dissipation affected by TMD was examined, and the ratio of the hysteretic energy absorption in the structure with TMD to that without it is proposed to be used, in conjunction with the peak displacement ratio, as a supplementary TMD performance index since it gives an indication of the accumulated damage induced in the inelastic structures. For the ground motions considered, TMD would be effective in reducing the hysteretic energy absorption demand in the critical storeys for buildings in the 1.8–2.8 s range. The consequence is reduction in damage of the buildings which would otherwise suffer heavy damage in the absence of TMD, resulting in economical restorability in the damage control limit state. This is of practical significance in view of the current trend toward performance‐based design. Copyright © 2001 John Wiley & Sons, Ltd.     

Multi-layer Tectonic Model for Intraplate Deformation and Plastic-Flow Network in the Asian Continental Lithosphere

In a large area of the east—central Asian continent there is a unified seismic network system composed of two families of large—seismic belts that intersect conjugately. Such a seismic network in the middle—upper crust is actually a response to the plastic flow network in the lower lithosphere including the lower crust and lithospheric mantle. The existence of the unified plastic flow system confirms that the driving force for intraplate tectonic deformation results mainly from the compression of the India plate, while the long-range transmission of the force is carried out chiefly by means of plastic flow. The plastic flow network has a control over the intraplate tectonic deformation.     

一降水工程的施工和从中引出的思考

基坑降水是岩土工程中经常遇到的施工问题。本文展示了一个降水工程实例，从中引伸出本工程尚未遇到而在其他项目中可能会出现并应及时解决的一些技术问题，引起同行的关注与重视。     

Convergence of Liapunov Series for Maclaurin Ellipsoids

According to the classical theory of equilibrium figures surfaces of equal density, potential and pressure concur (let call them isobars). Isobars may be represented by means of Liapunov power series in small parameter q, up to the first approximation coincident with centrifugal to gravitational force ratio on the equator. A. M. Liapunov has proved the existence of the universal convergence radius q : above mentioned series converge for all bodies if q < q . Using Liapunov's algorithm and symbolic calculus tools we have calculated q = 0.000370916. Evidently, convergence radius q ₀ may be much greater in non-pathological situations. We plan to examine several simplest cases. In the present paper, we find q ₀ for homogeneous liquid. The convergence radius turns out to be unexpectedly large coinciding with the upper boundary value q ₀ = 0.337 for Maclaurin ellipsoids.