测量平差抗差模型设计

本文根据抗差估计原理分别导出了几种不同类型测量平差抗差模型。讨论了这些模型的适用范围和实际应用中应注意的一些问题。     

极小极大理论和抗差方案的设计

本文根据极小极大准则讨论了几种抗差估计的最小信息分布。推演了这几种估计中的污染率与信息划分域之间的数学关系,最小信息和渐近方差的算式,以及它们在正态分布情况下的偏度。     

空间后交的一种新算法

根据矩阵理论，推导了空间后交的一种新算法。这种方法简单易行，无需线性化，其计算结果、精度与传统方法一致。     

骨龄评定统计模型的建立

介绍了手腕骨的筛选，手腕骨发育信息的量化和获取，回归模型和建立和稳健化方法。     

Lung function in subjects exposed to crude oil spill into sea water

A Greek oil-tanker ran aground, resulting in a huge oil spill along the costal areas of Karachi, Pakistan. The purpose of this study was to assess the lung function and follow up change after one year in subjects exposed to crude oil spill in sea water. It was a cross sectional study with follow up in 20 apparently healthy, non-smoking, male workers, who were exposed to a crude oil spill environment during oil cleaning operation. The exposed group was matched with 31 apparently healthy male control subjects. Pulmonary function test was performed using an electronic Spirometer. Subjects exposed to polluted air have significant reduction in forced vital capacity (FVC), forced expiratory volume in first second (FEV(1)), forced expiratory flow (FEF(25-75%)) and maximum voluntary ventilation (MVV) compared to their matched controls. This impairment was reversible and lung functions parameters were improved when the subjects were withdrawn from the polluted air environment.     

基于分形理论的面积精度估算

分形理论是研究非线性系统的重要工具。文中首先讨论栅格数据中面积精度估算的一般公式,然后基于分形理论进行了分析与研究３,选用了等面积的圆,正方形,复杂多边形和ｋｏｃｈ分形雪花图案四种图形进行了计算分析比较,得出了一些有益的结论。     

电阻负载偶极天线辐射图形的数值研究

通过计算得出了低损耗介电半空间上的有限体积电阻负载水平电偶极的远场辐射图形，这些图形是由瞬变无穷小偶极单元的计算结果叠加而成的，其中每个单元的瞬变波形是由严格的稳态解合成的，每个偶极单元电流激发是一个半周正弦平方波形，这种波以变速沿偶极单元传播。假定天线端点无反射，电流半周期的时间长度控制着瞬变辐射变形主波的全部时间，偶极激发电流的振幅是由模拟电阻负载的余弦分布决定的，瞬变辐射图形与稳态偶极图形的     

沙特阿拉伯成功地应用最新技术提高原油采收率

本文描述了沙特阿拉伯油田３种新技术应用实例;三维地震,水平井,多侧向钻井,结果表明;（１）应用三维地震使油田探边更准确,油藏描述更精细,更准确的油藏体积预测可以制定可靠的油田开发和生产目标,对沉积相和饱和度范围等油藏描述更精细有助于降低油田开发成本,高效进行油藏经营管理。（２）水平井和大斜度井有利于开发;钻垂直井没有经济效益的低渗透致密油藏,圈闭在有随机焦油少充填的油藏中油带及顶层油,底水之止滞留     

Heavy metal contents in growth bands of Porites corals: record of anthropogenic and human developments from the Jordanian Gulf of Aqaba

In order to assess pollutants and impact of environmental changes in the coastal region of the Jordanian Gulf of Aqaba, concentrations of six metals were traced through variations in 5 years growth bands sections of recent Porties coral skeleton. X-radiography showed annual growth band patterns extending back to the year 1925. Baseline metal concentrations in Porites corals were established using 35 years-long metal record from late Holocene coral (deposited in pristine environment) and coral from reef that is least exposed to pollution in the marine reserve in the Gulf of Aqaba. The skeleton samples of the collected corals were acid digested and analyzed for their Cd, Cu, Fe, Mn, Pb and Zn content using Flame Atomic Absorption Spectrophotometer (FAAS). All metal profiles (except Fe and Zn) recorded the same metal signature from recent coral (1925–2005) in which low steady baseline levels were displayed in growth bands older than 1965, similar to those obtained from fossil and unpolluted corals. Most metals showed dramatic increase (ranging from 17% to 300%) in growth band sections younger than 1965 suggesting an extensive contamination of the coastal area since the mid sixties. This date represents the beginning of a period that witnessed increasing coastal activities, constructions and urbanization. This has produced a significant reduction in coral skeletal extension rates. Results from this study strongly suggest that Porites corals have a high tendency to accumulate heavy metals in their skeletons and therefore can serve as proxy tools to monitor and record environmental pollution (bioindicators) in the Gulf of Aqaba.