土工格栅加筋路堤有限元分析

通过有限元软件ANSYS对土工格栅加筋路堤进行模拟,阐述了加筋土的加筋作用原理。通过一个工程实例分别对不加筋、仅加砂垫层、加一层土工格栅砂垫层、加两层土工格栅砂垫层四种不同的加筋路堤进行了计算。分析了不同加筋方式下加筋土路基竖向位移、侧向位移、竖向应力、剪应力和筋材拉力的规律。     

2003年9月27日俄蒙中边界7.9级地震的中期预测及其重要意义

2003年9月27日在俄罗斯(靠近蒙古、中国边界)发生了7．9级地震。作者在两年前对俄蒙中边界7．9级地震作过中期预测，预测意见和这一巨震的比较表明：这一预测是成功的，预测的依据是清楚和明了的。这显示了12个8级左右巨震的空间有序图象。6对对应地震的迁移速度(v)的平均值为14．50km/a，6个v值的变化范围在10—22km/a之内。从而提出：在地壳深处(甚至上地幔上部)可能存在一种巨型结构，它在控制着这些巨震的有序和重复迁移。     

Earth’s density flattening and hypothesis of latitudinal normal density

In this paper, the definition of latitudinal density and density flattening of the level ellipsoid is given, and integral formulas of latitudinal density for pole gravity and equator gravity are derived. According to the pole gravity condition and equator gravity condition for the level ellipsoid, latitudinal density distribution function of the level ellipsoid is obtained. It is proved mathematically that latitudinal density of the earth’s equator is larger than that of the pole, the earth’s density flattening calculated preliminarily is 1/322, and hypothesis of the earth’s latitudinal normal density is further proposed, so that theoretical preparation for studying the forming cause of the earth gravity in problems such as continent drift, mantle convection, and submarine extension is made well.     

四川省赋煤构造单元划分及构造控煤作用分析

通过对四川省地质构造后期演化及其变形特征的综合研究,结合主要含煤岩系分布及聚煤特征,将四川省赋煤构造单元划分为川南-黔北、华蓥山、米苍山-大巴山、龙门山、川中、大凉山-攀枝花、盐源、巴颜喀拉、西秦岭9个二级赋煤构造带。以构造研究为主线,根据主要含煤岩系和煤层赋存特征与构造形态之间的关系,结合野外实地调查、煤田地质勘查资料以及典型控煤构造特征分析,研究区控煤构造可划分为5大类14种类型,虽然构造样式丰富,类型多样,但主要以挤压构造样式的褶皱断裂组合和逆冲断裂组合为主,其它各类构造样式虽有发育,但数量较少,规模一般也不大。     

地球化学计算中误差传递分析的应用

通过两个实例讨论了地球化学计算中的误差传递问题,对照了四种不同方法的潜力和限制,拓广了蒙特卡洛方法在相关变量分析中的应用,指出其在不同条件下总能用有限机时逼近合理结果,揭示出协方差矩阵法的特殊效益,可相对于独立初始变量展现中间变量的相关关系。     

Combining AHP with GIS in synthetic evaluation of environmental suitability for living in China's 35 major cities

There are nearly 700 cities in China, each with their own particular characteristics of natural environment quality and rates of economic development. When people are able to choose a city to live in, they will take into account these characteristics in order to improve their lifestyles. Based on geographic information system technology and the analytic hierarchy process method, a model of the living environment suitability index (LESI) for the larger cities of China was designed. The LESI was constructed by using the factors of economic condition, convenience and livable degree, natural environment and natural resources. The LESI model was then applied to compare the living conditions in 35 major cities in China in 2007, including 30 provincial capitals and 5 sub-provincial cities. LESI values were higher for cities in southeast China than for cities in the northwest. The highest LESI values were mainly distributed along the Chinese southeast coast and the Yangtze River Delta. Cities with the lowest LESI values were found in the centre and north of China. Of the 35 cities, 4 had highly suitable living environments and 7 had unsuitable living environments.     

测量仪器在高层建筑施工中的应用

本文论述了新型测量仪器在高层建筑施工测量中的使用情况,并对新型测量仪器的使用方法及测量精度进行了分析。     

The mineral chemistry of pyroxenite xenoliths in the volcanic rocks of Hoh Xil and their significance

The pyroxenite xenoliths in the volcanic rocks of Hoh Xil consist of clinopyroxenes and orthopyroxenes. The mineral composition of these pyroxenes is similar to that of mantle xenoliths including peridotite and pyroxenite from China and abroad, and different from that of granulites. The pyroxenes formed at 1101–1400°C (averaging 1250°C) and under 30–60 kb (averaging 46 kb). We deduced that the magma was derived from the mantle at a depth of more than 150 km, which fits in with the geophysical conclusion that the low-velocity layer existed in the mantle under 150 km.

     

中国留学人员创业园分布及产业特征

以《中国留学人员创业年鉴》为基础数据,采用GIS空间分析技术,运用核密度估计法、L函数和最近邻层次聚类分析等方法,分析2006~2015年中国留学人员创业园空间分布规律以及园区产业集聚特征,结果表明：中国留学人员创业园集聚特征显著,而且随着时间的推移,其多中心趋势明显,集聚规模迅速增大,集聚强度呈“先升后降,但总体增大”趋势;主要集聚于长三角、京津冀和珠三角等地区,尤以前两者最显著,且三大集聚区的集聚强度与集聚规模差异明显,其中长三角留创园的集聚规模最大,京津冀集聚强度最高,而珠三角则比较复杂,其在很小空间尺度范围内服从集聚分布,而在较大空间尺度范围内则服从随机分布;基于不同主导产业的中国留学人员创业园依然集中于长三角、京津冀和珠三角等地区,其主导产业分布格局则差异显著,规律性不强。     

Direct Climatic Effect of Dust Aerosol in the NCAR Community Atmosphere Model Version 3 （CAM3）

Direct climate responses to dust shortwave and longwave radiative forcing (RF) are studied using the NCAR Community Atmosphere Model Version 3 (CAM3). The simulated RF at the top of the atmosphere (TOA) is-0.45 W m-2 in the solar spectrum and +0.09 W m-2 in the thermal spectrum on a global average. The magnitude of surface RF is larger than the TOA forcing, with global mean shortwave forcing of-1.76 W m-2 and longwave forcing of +0.31 W m-2 . As a result, dust aerosol causes the absorption of 1.1 W m-2 in t...