试论岩画中人体运动形象的人文内含

岩画揭示了原始初民的思维方式，同时也形象地表现了原始人的生活情景，岩画中人体运动形象作为人类早期带有巫术祭祀性质的身体运动游戏方式是研究体育运动源起的信史，其人文内含揭示了人从蒙昧逐渐走向最初的(原始的)文明的一个过程。     

基于匹配点逐层过滤的岩体点云配准方法

岩体点云配准是岩体三维重建与分析的基础。经典的点云配准方法虽然能够很好地适用于普通点云,但对于岩体点云并不能获得足够的精度。由于岩体点云表面结构复杂,且大部分区域为平面,基于岩体点云的这些特点,提出通过几何特征逐层过滤匹配点的岩体点云配准算法,引入匹配点对的协方差矩阵的特征值和特征向量矩阵,以及曲率、主方向等几何特征逐层过滤匹配点对,精确地找到匹配点对。在不同岩体点云上的实验测试与分析结果表明,该算法在准确度上有明显优势。     

期刊文献分布特征的分析

以1999-2003年生物技术学科期刊文献分布曲线为依据,利用知识密度梯度graduR(n)的概念,对知识场中文献分布特征进行分析。结果表明,在任何一个学科的知识场中,集中区文献分布呈间断性变化,离散区文献分布呈连续性变化,从而构成期刊文献分布的基本特征。基于此,指出期刊文献分布特征研究是对文献分布规律的进一步描述。     

Do children spend too much time in schools? Evidence from a longer school year in Indonesia

I examine the effects of a longer school year in Indonesia on grade repetition, educational attainment, employability, and earnings. I exploit an arbitrary rule that assigned students to a longer school year in Indonesia in 1978–1979, which fits a fuzzy regression discontinuity design. I find the longer school year decreases the probability of grade repetition and increases educational attainment; it also increases the probability of working in formal sectors and wages later in life. These results suggest the length of school years in Indonesia is not too long.     

Numerical method to determine mechanical parameters of engineering design in rock masses

INTRODUCTION The historical development of research in rockmechanics has yielded numerous useful and work-able theories. The Coulomb Criterion (1772) andMohr’s Hypothesis (1990) both provide easy andeffective methods for determining mechanical pa-rameters such as rock strength. R.E. Goodmanformulated the equation of mesh and non-meshjoints construction. Other researchers conductedexperiments on different types of rock masses withspecific, unique properties, to solve increasinglyc…     

人工挖孔灌注桩施工若干难点技术

广东发展大厦人工挖孔灌注桩施工中，在穿越软弱土层，施工排水，持力层，入岩的确认以及桩芯混凝土质量控制等方面，为确保桩基础施工质量所采取的有效技术措施。     

Optimal Design for Two-Level Random Assignment and Regression Discontinuity Studies

An important concern when planning research studies is to obtain maximum precision of an estimate of a treatment effect given a budget constraint. When research designs have a multilevel or hierarchical structure changes in sample size at different levels of the design will impact precision differently. Furthermore, there will typically be differential costs of enrolling additional units at different levels of the hierarchy. The optimal design problem in multilevel research studies involves determining the optimal sample size at each level of the design given specified design parameters and a specified marginal cost of recruitment at each level. The current work extends existing results by considering optimal design for (a) unbalanced random assignment designs and (b) regression discontinuity designs.     

顺层石质路堑爆破开挖与防护技术

介绍台阶浅孔开挖与松动爆破相结合的顺层石质路堑爆破技术和自上而下，分段分层开挖，逐段清理、逐段防护、逐段成型的顺层石质路堑施工技术。     

抒抱独情,发亡国愤--《船山记》探幽

《船山记》用春秋笔法隐晦地表达了作者强烈的民族主义思想。作者以顽石自喻，表白自己不甘做满清顺民的抱独之情。同时借古人对待游与居的态度和理想，比照自己的人生信念和所处的现实社会环境，抒发了对反清失败、复明无望的终身抱憾，以及人将其死之际，留连人世的深切悲哀。     

淮北矿区软岩巷道支护措施及实践

软岩巷道维护，一直是困扰矿区煤矿生产建设的难题，在软岩内布置巷道，围岩压力大，稳定性差，巷道掘进和支护十分困难，巷道屡遭破坏，需经常修复，严重影响了矿井的安全和生产建设；根据软岩巷道变形力学机制及围岩变形压力显现特点，探索采用围岩加固与巷道支护并举的方法，取得较理想支护效果。