东沟特大型斑岩钼矿床的物化探找矿效果

对河南东沟钼矿床的区域物化探成果进行整理、研究,运用物化探资料循序渐进地揭示出钼矿床的空间分布规律。东沟特大型钼矿床的发现,不仅为我国的钼矿产业今后几十年的稳步发展将产生深远的影响,而且为在东秦岭—大别山钼成矿带进一步运用物化探作为充分必要手段,为寻找更多的钼矿资源提供了难得的成功经验。     

聚类分析在监测区域样地分类中的应用研究

为建立监测区域以遥感和GIS为基础的森林郁闭度及蓄积定量估测方程，需在监测区域抽取一定数量有代表性的样地。如何有效抽取有代表性的样地属多目标优化问题。若根据监测区域已知样地的数量，采用所有可能的组合方法，按一定优化标准进行抽样，计算工作量将非常庞大，实际工作中很难进行。为此需先对监测区域的样地进行分类，在分类的基础上选择一定数量有代表性的样地。因度量样地之间亲疏程度的统计量及类和类之间相似性测度指标有多种，因此对同一监测区域，不同的统计量及类和类之间相似性测度指标，将得到不同的分类结果。设置不同的影响郁闭度及蓄积估测的遥感和GIS因子，分类结果也会出现较大的差异。本文针对特定监测区域，采用计算机仿真方法，系统研究了不同影响因子对分类的影响规律，实际工作中应如何选择度量样地间亲疏程度的统计量及类和类之间相似性测度指标，所得结果可用于指导生产实践。     

基于改进遗传算法的公路桥梁损伤程度标定的两阶段法

提出了基于改进遗传算法的公路桥梁损伤程度标定的两阶段法。第一阶段:应用静应变残差进行损伤定位;第二阶段:基于已经识别出的损伤位置,利用改进的遗传算法进行损伤程度的标定。两阶段方法有效地克服了同时进行常规的损伤位置识别和损伤程度的标定的收敛速度慢、存储空间大及可能误标定等问题。某三跨连续桥梁应用分析发现,在已知很少实测数据的情况下,对损伤程度的识别取得较理想的效果,证实了基于改进遗传算法的两阶段法用于损伤程度的识别具有更高的效率,更好的灵敏度、稳定性和可靠性。     

电性参数在煤层气测井中的应用

在煤层气测井中,利用自然电位和双侧向电阻率可以定性判断含气层位。利用电阻率参数可推算煤层的孔隙度和含气饱和度,结合密度对煤层气可以进行定量计算。．     

Combining CLUE-S and SWAT models to forecast land use change and non-point source pollution impact at a watershed scale in Liaoning Province,China

Non-point source （NPS） pollution has become a major source of water pollution. A combination of models would provide the necessary direction and approaches designed to control NPS pollution through land use planning. In this study, NPS pollution load was simulated in urban planning, historic trends and ecological protection land use scenarios based on the Conversion of Land Use and its Effect at Small regional extent （CLUE-S） and Soil and Water Assessment Tool （SWAT） models applied to Hunhe-Taizi River Watershed, Liaoning Province, China. Total nitrogen （TN） and total phosphorus （TP） were chosen as NPS pollution indices. The results of models validation showed that CLUE-S and SWAT models were suitable in the study area. NPS pollution mainly came from dry farmland, paddy, rural and urban areas. The spatial distribution of TN and TP exhibited the same trend in 57 sub-catchments. The TN and TP had the highest NPS pollution load in the western and central plains, which concentrated the urban area and farm land. The NPS pollution load would increase in the urban planning and historic trends scenarios, and would be even higher in the urban planning scenario. How- ever, the NPS pollution load decreased in the ecological protection scenario. The differences observed in the three scenarios indicated that land use had a degree of impact on NPS pollution, which showed that scientific and ecologically sound construction could effec- tively reduce the NPS pollution load in a watershed. This study provides a scientific method for conducting NPS pollution research at the watershed scale, a scientific basis for non-point source pollution control, and a reference for related policy making.     

深层黏性土变形破坏的影响因素分析

河南刘河煤矿矿二1煤层上为厚度20~40m的第四系覆盖层,其中黏土层平均厚度为6.6m。由于第四系孔隙水含水组的四个含水段均为富水性中等及以上含水层,所以该层黏性土在受到上覆高压影响后能否控制顶板突水显得尤为关键,是解决新生界含水层下的安全开采的关键问题。通过室内实验测得该矿深度约在150m的4个钻孔土样的物理参数和土颗粒级配分析,按实验结果模拟深层黏性土,考虑受力面积、含水率和厚度3个影响黏性土破坏的主要因素,利用正交实验原理安排实验。结果表明,受力面积和含水率越大,黏性土的破坏程度增大;黏性土的厚度越大,破坏程度相应减小;3个因素中,受力面积的影响最大;当黏性土含水率在10%~25%,受力面积越小,厚度越大,黏性土不易发生破坏。该研究对预防和保证矿山安全生产具有重要意义。     

Climate during the last glacial maximum in the Wasatch and southern Uinta Mountains inferred from glacier modeling

Recent improvements in understanding glacial extents and chronologies in the Wasatch and Uinta Mountains and other mountain ranges in the western U.S. call for a more detailed approach to using glacier reconstructions to infer paleoclimates than commonly applied AAR-ELA-ÄT methods. A coupled 2-D mass balance and ice-flow numerical modeling approach developed by [Plummer, M.A., Phillips, F.M., 2003. A 2-D numerical model of snow/ice energy balance and ice flow for paleoclimatic interpretation of glacial geomorphic features. Quaternary Science Reviews 22, 1389–1406] allows exploration of the combined effects of temperature, precipitation, shortwave radiation and many secondary parameters on past ice extents in alpine settings. We apply this approach to the Little Cottonwood Canyon in the Wasatch Mountains and the Lake Fork and Yellowstone Canyons in the south-central Uinta Mountains. Results of modeling experiments indicate that the Little Cottonwood glacier required more precipitation during the local Last Glacial Maximum (LGM) than glaciers in the Uinta Mountains, assuming lapse rates were similar to modern. Model results suggest that if temperatures in the Wasatch Mountains and Uinta Mountains were  6 °C to 7 °C colder than modern, corresponding precipitation changes were  3 to 2× modern in Little Cottonwood Canyon and  2 to 1× modern in Lake Fork and Yellowstone Canyons. Greater amounts of precipitation in the Little Cottonwood Canyon likely reflect moisture derived from the surface of Lake Bonneville, and the lake may have also affected the mass balance of glaciers in the Uinta Mountains.     

2016年登陆和影响福建台风成因分析及预测

2016年共有3个台风登陆、4个台风影响福建,呈前少后多分布,登陆台风偏多,灾害影响重。分析表明：（1）2016年以来赤道中东太平洋海温距平的演变及大气环流异常响应是造成影响福建台风呈前少后多分布及登陆台风偏多的主要原因。（2）7月下旬至8月中旬和9月上旬至中旬西太平洋台风群发,“莫兰蒂”和“马勒卡”一周内相继登陆和影响福建,是季风槽增强或持续偏强的结果,且季风槽呈现显著的低频变化特征。（3）2016年西北太平洋生成和影响福建的台风与热带大气季节内振荡关系密切,近7成生成于MJO第5~7位相。（4）基于大气低频变化理论的延伸期预报填补了月—季预测和中短期天气预报之间的空白。     

南极海冰面积变化特性及其与赤道太平洋海表面温度的联系

南极海冰面积变化特性及其与赤道太平洋海表面温度的联系陈锦年,乐肯堂,于康玲,张彦臣（中国科学院海洋研究所,青岛２６６０７１）（青岛海洋大学,青岛２６６００３）关键词南极海冰面积,赤道太平洋海表面温度,厄尔尼诺１引言８０年代以前,人们对南极实地考察、资...     

机械滤波器的设计

本文概述了海上测量用机械滤波器的设计原理,给出了它的基本结构,并推导出了它的幅频特性。