Empirical distributions of galactic λ spin parameters from the Sloan Digital Sky Survey

Using simple dimensional arguments for both spiral and elliptical galaxies, we present formulae to derive an estimate of the halo spin parameter λ for any real galaxy, in terms of common observational parameters. This allows a rough estimate of λ, which we apply to a large volume-limited sample of galaxies taken from the Sloan Digital Sky Survey data base. The large numbers involved (11 597) allow the derivation of reliable λ distributions, as signal adds up significantly in spite of the errors in the inferences for particular galaxies. We find that if the observed distribution of λ is modelled with a lognormal function, as often done for this distribution in dark matter haloes that appear in cosmological simulations, we obtain parameters  λ₀= 0.04 ± 0.005  and  σ_λ= 0.51 ± 0.05  , interestingly consistent with values derived from simulations. For spirals, we find a good correlation between empirical values of λ and visually assigned Hubble types, highlighting the potential of this physical parameter as an objective classification tool.     

量化评价指标的自动统计算法研究

为了能使矿井构造量化预测技术在更多的矿井中推广应用 ,探讨了评价单元自动剖分、信息提取与存储、评价指标量化等矿井构造量化预测全程自动化实现技术的主要算法     

秦沈高速铁路某段地基的可靠性分析

在对秦沈高速铁路建筑中某段地基的可靠性分析中，对施工中发现的地质情况与勘测设计资料不符的问题进行了合理的解决。在分析过程中，把地基可靠性放在结构整体可靠性的概念中来研究，使地基设计安全的“富余”程度得到定量的描述。     

Clast Fabric in Relict Periglacial Colluvium, Salamanca Re-Entrant, Southwestern New York, USA

Samples of macrofabric data obtained from colluvial deposits near the late-Wisconsinan glacial margin display widely divergent characteristics. Those from highly weathered and jointed sandstone plot as girdle distributions. Samples from red colluvium of early-Wisconsinan age form moderately strong clusters. Fabrics from shallow depth in medium-textured brown colluvium of late-Wisconsinan age generally have modes aligned with the local slope but are weak, and appear to have been modified by frost heaving. Clasts in the basal layers of an overlying loess unit were emplaced by frost heaving from the brown colluvium and have very weak or uniform fabrics. Particle shape exerts an influence on fabric strength in the brown colluvium, with samples composed of more elongated clasts displaying stronger fabrics. Fabrics from near-surface deposits show generally weaker shape and strength characteristics and higher inclinations than those at depth. Calculated seasonal frost penetration is consistent with the depth to which weaker, more steeply inclined fabrics are found. Sampling in relict periglacial deposits should be performed only below the level of disturbance by seasonal frost.     

工程场地破裂灾害理论初探

工程场地破裂灾害是区域非稳定动力学环境下的灾害效应之一，但目前对其尚无针对性系统研究，本文探讨了工程场地破裂的涵义，相关课题，研究现状，研究内容，并提出了自己的理论认识和观点，论述了区域非稳定动力学环境下的工场地破裂效应。     

建筑物震害直接经济损失评定的误差分析

本文概述了引起震害损失评定误差的主要因素。通过实际震害评定资料，定量分析了震害损失评估中各因素形成误差数值的大小。采用以采样平均相对误差或采样均方误差及损失值相对误差来评估震害评定质量的方法，并通过分析给出综合衡量评定精度的量化指标，对震害经济损失评定准确度进行评估。     

地震灾害发展趋势估计

本文研究了地震灾害的四大指标－频率、死亡、受灾人数、直接经济损失，分析了地震灾害在自然灾害中的比重，中国地震灾害的严重性，地震灾害与国民收入的关系。估计了未来地震灾害的发展趋势。     

对一起地震传言的影响评价和对策思考

本文对1993年10—11月份发生在厦门的地震传言的平息对策和社会调查统计作了研究，得到了几点有关地震社会学的认识。