烷烃与海水界面张力的研究

于１９９１年３月－１９９２年６月间用滴体积法较系统地测定正已烷、正庚烷、正辛烷、异辛烷、正十二烷、正十六烷和煤油与海水在不同的温度（１６－４０℃）和盐度（１０－４０）范围内的界面张力，测定值的相对误差≤０．５％。对数据进行统计处理后，归纳出所研究烷烃－海水界面张力与温度和盐度的经验关系式，计算与实验值相对误差≤０．５％。     

Metallogenic focus-area and superlarge mineral deposits in the bordering zones between China,Russia and Mongolia

A correlative study of geology and metallogenic process in the bordering zones between China, Russia and Mongolia shows that the region of the western slope of the Da Hingan Mts. -Eastern Transbaikalia-Eastern Mongolia is a metallogenic focus-area associated with Late Mesozoic intraplate tectono-magmatic activation. During the period of 160–120 Ma a great number of multiplex deposits with similar genesis including large and superlarge mineral deposits were formed.

     

四川省剑门关一带晚侏罗世沉积体系与古环境演化

晚侏罗世是龙门山前陆盆地演化的关键时期, 因而沉积体系与古环境演化研究具有重要意义.运用比较沉积学的方法, 通过对沉积序列与旋回的详细研究, 将研究区晚侏罗世沉积体系分为湖泊沉积体系、三角洲沉积体系、冲积扇沉积体系以及河流沉积体系; 基于沉积背景和演化的分析, 确定龙门山推覆构造带是研究区晚侏罗世古环境演化和沉积体系空间配置的控制因素; 依据古流和物源分析, 确定西北部的龙门山是本区主要物源区      

黄河三角洲饱和粉土液化特性及孔压模型试验研究

以黄河三角洲地区可液化场地粉土为研究对象,利用室内循环三轴试验结果,分析了动荷载作用下粉土的液化特性,通过模拟地震荷载作用下粉土的孔压响应,提出了原状粉土的孔压上升模型,并与粉质粘土和粉砂的液化特性和孔压模型进行了对比,并得出一些结论。     

内蒙古东珺铅锌银矿床闪锌矿Rb-Sr定年及其地质意义

热液脉型铅锌多金属矿床是内蒙古得尔布干成矿带一重要矿床类型,由于缺乏适当的定年方法,该类矿床的成矿年龄及其形成的地质背景一直不明确。东珺铅锌银矿床是一新近发现的热液脉型矿床,本文在对采自该矿床的6件闪锌矿矿石样品进行了结构构造研究的基础上,对闪锌矿的Rb-Sr同位素进行了分析。结果表明,闪锌矿87 Rb/86 Sr和87 Sr/86 Sr同位素比值均有较大的分布范围,分别分布在0.283 8~6.503 0和0.713 685~0.725 241范围内,二者具有很好的线性关系,构成的等时线年龄为(130.2±4.4)Ma(2σ,MSWD=16),(87Sr/86Sr)0=0.713 176±0.000 057,指示矿床形成于早白垩世。早白垩世大兴安岭地区处于伸展构造体制,因此该类矿床是在拉张构造体制的背景下形成的,与区内早白垩世浅成-超浅成岩浆侵入活动有关,它代表了区内一重要成矿阶段与成矿类型。     

Crowd sensing and spatiotemporal analysis in urban open space using multi-viewpoint geotagged videos

Increasing concern for urban public safety has motivated the deployment of a large number of surveillance cameras in open spaces such as city squares, stations, and shopping malls. The efficient detection of crowd dynamics in urban open spaces using multi-viewpoint surveillance videos continues to be a fundamental problem in the field of urban security. The use of existing methods for extracting features from video images has resulted in significant progress in single-camera image space. However, surveillance videos are geotagged videos with location information, and few studies have fully exploited the spatial semantics of these videos. In this study, multi-viewpoint videos in geographic space are used to fuse object trajectories for crowd sensing and spatiotemporal analysis. The YOLOv3-DeepSORT model is used to detect a pedestrian and extract the corresponding image coordinates, combine spatial semantics (such as the positions of the pedestrian in the field of view of the camera) to build a projection transformation matrix and map the object recorded by a single camera to geographic space. Trajectories from multi-viewpoint videos are fused based on the features of location, time, and directions to generate a complete pedestrian trajectory. Then, crowd spatial pattern analysis, density estimation, and motion trend analysis are performed. Experimental results demonstrate that the proposed method can be used to identify crowd dynamics and analyze the corresponding spatiotemporal pattern in an urban open space from a global perspective, providing a means of intelligent spatiotemporal analysis of geotagged videos.     

SHRIMP zircon U–Pb and molybdenite Re–Os isotopic dating of the tungsten deposits in the Tianmenshan–Hongtaoling W–Sn orefield, southern Jiangxi Province, China, and geological implications

The southern Jiangxi Province is a major part of the Nanling W–Sn metallogenic province of southern China, where all W–Sn ore deposits are temporally and spatially related to Mesozoic granitic intrusions. The Tianmenshan–Hongtaoling orefield is a recently explored territory endowed by several styles of W–Sn mineralization. The orefield comprises three composite granitic plutons: Tianmenshan, Hongtaoling and Zhangtiantang associated with several tens of W–Sn-polymetallic ore deposits (Maoping, Baxiannao, Niuling, Zhangdou, Yaolanzhai and others) along their contacts. In this study, four new SHRIMP zircon U–Pb ages were determined for three composite granitic plutons, and 33 molybdenite samples from five W–Sn deposits were analysed by ICP-MS Re–Os isotopic method. SHRIMP zircon U–Pb ages for both medium to coarse-gained biotite granite and porphyritic biotite monzogranite from the Tianmenshan composite pluton are 157.2 ± 2.2 Ma and 151.8 ± 2.9 Ma, respectively. Molybdenite Re–Os isochron ages for the related Baxiannao fracture-controlled tungsten deposits are 157.9 ± 1.5 Ma. Maoping greisens-type tungsten deposits were emplaced at 155.3 ± 2.8 Ma and the Maoping wolframite–quartz veins at 150.2 ± 2.8 Ma, respectively. The SHRIMP U–Pb age of zircons from the Hongtaoling biotite granite is 151.4 ± 3.1 Ma whereas the molybdenite Re–Os isochron ages of the genetically related Niuling endocontact tungsten quartz veins and Zhangdou exocontact tungsten quartz veins are 154.9 ± 4.1 to 154.6 ± 9.7 Ma and 149.1 ± 7.1 Ma, respectively. The SHRIMP zircon U–Pb age of the Zhangtiantang fine-grained muscovite granite is 156.9 ± 1.7 Ma, whereas the molybdenite Re–Os isochron age for the related Yaolanzhai greisens-type tungsten deposit is 155.8 ± 2.8 Ma. These new age data, combined with those available from the literature, indicate that the ages of W–Sn ores and related granites are Late Jurassic with a peak at 150 to 160 Ma, which corresponds to the widespread Mesozoic metallogenic event in southern China. Molybdenites from this group of tungsten deposits have quite low Re contents (29.1 to 2608 ppb), suggesting continental crustal provenance of the ore metals.     

基于SPSS的矿石小体重与品位的多元回归分析模型的构建

在矿床储量计算过程中,矿石体重预测的准确与否将直接影响到资源储储量的可靠程度.对矿石体重的准确预测需要大量运算的统计问题,利用SPSS(Statistical Product and Service Solutions)的Regression模块,对所测定的矿石小体重与其矿石品位进行多元回归分析,快速、准确的构建了矿石体重与品位的数学模型,从而为储量计算提供了科学依据.