Hill stability in the many-body problem

We established a criterion for the Hill stability of motions in the problem of many spherical bodies with a spherical density distribution. The region of Hill stability was determined. The sizes of this region are comparable to the total volume of all of the bodies in the system, which sharply increases the probability of mutual collisions. This result may be considered as a confirmation that a supermassive core can be formed at the center of a globular star cluster. The motions in the n-body problem are shown to be unstable according to Hill.     

水电工程中弱风化岩体可利用性探讨

根据水电工程实际，分析了岩体各风化分带的特点，提出在用其它定性与定量相结合的方法对岩体进行风化分带之后，用有序地质量最优分割法对岩体进行弱风化亚带的定量划分．从而为水电工程准确确定建基面高程提供了较为科学的方法。将该法应用于歪头山铁矿边坡工程、岩体风化分带，获得了较好的效果。     

江西柘林水电站扩建工程安全监测分析

对江西柘林水电站扩建工程80山包施工监测布置及成果进行了介绍,并对监测成果进行了分析,安全监测在工程施工中发挥了重要作用。     

Hilltop Wind Profiles Using Sodar

A Remtech PA2 sodar has been operated at two hilltop sites in New Zealand overperiods of several months. Data were lost predominantly in periods of high windspeed. Data obtained from the sodar have been used to obtain typical wind profilesat the sites for the cross-ridge direction for neutral stratification and have beencompared with model profiles.     

江苏省宁镇扬山地丘陵地区农业资源的综合开发利用

宁镇扬山地丘陵地区土地面积133.9万公顷,农业资源丰富,是江苏省开发潜力很大的地区之一。本文从气候资源、水资源、土地资源和生物资源,阐述了它们的区域优势;探讨了农业资源开发利用中的主要问题。提出了综合开发利用的建议和对策,制定农业资源综合开发的总体规划;建立农业资源综合开发治理试验区;发挥山丘地区资源优势,建立商品生产基地。     

马坑山公路隧道岩爆预测研究

岩爆是高地应力条件下地下洞室开挖过程中经常遇到的一种动力失稳的地质灾害,直接威胁施工人员和设备的安全。论述了岩爆的定义、特征及发生机理,应用国内外相关岩爆判据判定和理论分析,提出对马坑山隧道开挖过程中是否会产生岩爆做出了最终判定。     

The causes of forest cover loss in the hill forests in Bangladesh

The Hill Forests in Bangladesh have been depleted and degraded in volume, area, and quantity, thus requiring urgent forest protection by identifying the causes of forest loss. This study seeks to identify the fundamental causes of the shrinking forest cover in the Hill Forests in Bangladesh. The results indicate four sets of causes: (i) indigenous forest dwellers, having their own types of problems; (ii) migrants, who, because of problems in their places of origin, have decided to move to the forests; (iii) the timber industry, which, legal or not, are cutting too many trees; and (iv) the government through its Forest Department which is not able or willing to implement suitable policies to regulate the cutting trees and to prevent illegal cutting. Because it is a time consuming task to mitigate the first and second sets of factors, we recommend to involve forest dwellers in forestry practices as much as possible and taking necessary steps to alleviate the third and fourth sets and thereby reduce the rate of forest depletion. Accordingly, a number of strategies that should be adopted to halt the loss of remaining forest cover are discussed. This revised version was published online in July 2006 with corrections to the Cover Date.     

GEO卫星Hill方程的分析型解法

提出并实现了一种求解静地轨道GEO(geostationary orbit)卫星Hill方程摄动解的分析型方法。根据地固坐标系下GEO卫星运动的特点,在其定点处把摄动力进行泰勒展开,通过选择特定的参考轨道获得了GEO卫星的地球扁率摄动解。在此基础上,成功地将拉普拉斯变换运用于GEO卫星的Hill方程,得到了一组可用于求解摄动分析解的递推积分公式。通过逐次趋近的方法,利用这组积分公式可以有效地实现由低阶解推求高阶解。     

墨西哥湾布什山冷泉碳酸盐岩沉积岩石学及地球化学

对墨西哥湾布什山采集的7块冷泉碳酸盐岩样品进行了沉积岩石学及地球化学研究,结果表明:冷泉碳酸盐岩以结壳的形式产出,结壳中双壳类和管状蠕虫等冷泉生物碎屑发育,结壳主要由泥晶、微晶和亮晶文石组成(含量89%～99%,平均94%)。碳酸盐岩13C中等亏损(δ13C最负值为-29.4‰,PDB),表明碳的来源主要是非甲烷的碳烃化合物,18O相对富集(δ18O为+2.4‰～+5.0‰,PDB),可能与原地水合物分解形成富集18O的孔隙水有关。碳酸盐矿物相(5%硝酸可溶部分)的稀土元素总量较低(0.40×10-6～20.85×10-6),稀土元素Ce异常特征和页岩标准化配分模式在不同样品、甚至同一样品结晶程度不同的碳酸盐矿物相(泥晶、微晶和亮晶)中变化显著,表明布什山冷泉碳酸盐岩形成过程中氧化还原条件复杂多变,控制氧化环境变化的主要因素可能是流体的渗漏速率。     

南极乔治王岛始新统化石山组沉积火山碎屑岩特征

南极乔治王岛化石山剖面的化石山组主要由沉积火山碎屑岩（包括沉火山角砾岩和沉凝灰岩）组成，上部夹正常沉积岩和两层薄煤层，形成从粗到细的两个沉积旋回。第１旋回的沉火山角砾岩和沉凝灰岩由不同粒级的火山岩岩屑、斜长石晶屑和细火山尘基质组成，火山碎屑物质含量在９０％以上，沉积特征显示从火山碎屑流（？）到低密度流的快速堆积性质。其中第１、２层沉凝灰岩受强烈的沸石化（浊沸石和方沸石）作用，而泥级沉凝灰岩夹层的细火山尘物质多已变成绿泥石－蒙脱石规则混层矿物；因为这种混层矿物也常常被沸石化，故其形成应在沸石化作用之前。Ｘ－衍射分析显示较多钠长石的存在。钠长石和方沸石的钠可能来自中长石被浊沸石化后释放出的Ｎａ＋。第２旋回由沉火山角砾岩、沉凝灰岩夹岩屑长石杂砂岩和薄煤层组成，显示正常沉积物经常被携入沉积盆地。第３、４层的泥级沉凝灰岩以显著的蒙皂石化为特征，沸石化作用不发育；其中的斜长石主要是中长石和（或）拉长石。化石山组泥级沉凝灰岩的微量元素组分及含量与下伏玛瑙滩组顶部安山岩的相当，但第２～３层间有某些元素迁移和富集，这可能与层间热水溶液的活动有关。Ｂ含量特别低（＜１×１０－６），不仅指示背景值低，而且也说明沉积环境与海水没有关