THE HYDROLOGICAL EFFECT UNDER HUMAN ACTIVITIESIN THE INLAND WATERSHEDS OF XINJIANG, CHINA

I INTRODUCTIONNatllral environment and water transform in theworld have changed faster and faster under the effect ofhuman activities. The study on effect of human activities to hydrological processes, and its extent and tendency has been more and more important as one of theresearch projects of hydrology in the world (RAI et al.,1998, BASS et al., 1998, WANGet al.,, 1998; HILLet al., 1998; LIU, 1997). It became one of the mainresearch program of international Hydrological Decade(…     

浅淡青海农村宅基地管理的现状及对策

改革开放以来,农村发生了前所未有的变化,农民随着生活水平的不断提高,要求改善居住条件的愿望也越来越迫切,农村建房热始终居高不下,并呈增长趋势,宅基地管理工作出现了新的问题.如何加强农村宅基地管理,对节约土地,稳定社会,改善农民居住条件,促进农村经济发展都具有重要意义.本文仅根据自己的工作实践和一些调查研究,对我省农村宅基地目前使用管理的现状、存在问题及解决对策,提出一些粗浅的意见和看法.     

西部开发中青海国土资源开发利用若干问题的思考

土地资源、矿产资源是人类生存和发展的基本条件,是人类财富的源泉,社会经济发展的重要物质基础。据有关资料表明,我国以占世界不到10％的耕地养活13亿多的人口,我国矿产资源为全社会提供95％的一次能源,80％的工业原料,70％以上的农业生产资料。据测算,我国目前与国土资源相关的产业对国民经济的直接支撑度在40％,影响涉及面达70％以上。     

浅谈青海农村宅基地管理的现状及对策

改革开放以来,农村发生了前所未有的变化,农民随着生活水平的不断提高,要求改善居住条件的愿望也越来越迫切,农村建房热始终居高不下,并呈增长趋势,宅基地管理工作出现了新的问题。如何加强农村宅基地管理,对节约土地,稳定社会,改善农民居     

南海全新世珊瑚礁ESR和铀系年龄的研究

用ESR和铀系方法对几个南海珊瑚礁浅钻的样品进行了年龄测定,实验结果表明这两种方法测定的年龄基本一致,这些珊瑚礁形成千全新世早期。在用附加剂量法求取总剂量值时,不论样品饱和的磁效应如何,采用指数方程拟合均可取得较好的效果。研究中发现样品的天然ESR信号强度I_0和样品磁饱和剂量时的ESR信号强度I_(max)之比可以很好的反映α辐射效率——k值的大小,用文中提出的方程确定k值可以提高海洋碳酸盐ESR测年的精度。     

Analysis of Wave Distributions Using the WAVEWATCH-Ⅲ Model in the Arctic Ocean

In this work, we examined long-term wave distributions using a third-generation numerical wave model called WAVE- WATCH-Ⅲ(WW3) (version 6.07). We also evaluated the influence of sea ice on wave simulation by using eight parametric switches. To select a suitable ice-wave parameterization, we validated the simulations from the WW3 model in March, May, September, and December 2017 against the measurements from the Jason-2 altimeter at latitudes of up to 60?N. Generally, all parameterizations ex-hibited slight differences, i.e., about 0.6 m root mean square error (RMSE) of significant wave height (SWH) in May and September and about 0.9 m RMSE for the freezing months of March and December. The comparison of the results with the SWH from the European Centre for Medium-Range Weather Forecasts for December 2017 indicated that switch IC4_M1 performed most effec-tively (0.68 m RMSE) at high latitudes (60?– 80?N). Given this finding, we analyzed the long-term wave distributions in 1999 – 2018 on the basis of switch IC4_M1. Although the seasonal variability of the simulated SWH was of two types, i.e., 'U' and 'sin' modes, our results proved that fetch expansion prompted the wave growth. Moreover, the interannual variability of the specific regions in the 'U' mode was found to be correlated with the decade variability of wind in the Arctic Ocean.     

Sulfides Geochemistry and Implications for Gold Mineralization in the Yangshan Gold Belt, West Qinling, China

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Building An Independent Pb-Zn Mineralization System Related to Magmatism: A Case Study of Narusongduo Pb-Zn Deposit in Tibet

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Tectono-Magmatic Events and Gold Metallogeny in the Qinling Orogen

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Generalized Square Conservative Multistep Finite Difference Scheme Incorporating Historical Observations

In this paper,a multistep finite difference scheme has been proposed,whose coefficients are determined taking into consideration compatibility and generalized quadratic conservation,as well as incorporating historical observation data.The schemes have three advantages:high-order accuracy in time,generalized square conservation,and smart use of historical observations.Numerical tests based on the one-dimensional linear advection equations suggest that reasonable consideration of accuracy,square conservation,and inclusion of historical observations is critical for good performance of a finite difference scheme.