晚更新世以来台湾浅滩西北近岸沉积特征与古环境演化

对取自台湾浅滩西北部福建东山岛外的浅钻ZK2孔进行了包括AMS14C测年、粒度、微体古生物、碎屑矿物和黏土矿物等分析.结果表明该孔地层中存在两个明显的海相层和其间的两个陆相层,顶部的海相层为全新世高海平面以来形成的被现代潮流作用改造的现代沉积和残留沉积混合体;底部陆相层为MIS4期低海平面时期形成的河流沉积;中间的细粒...     

等效沙厚度研究进展

风、沉积物和地表覆盖是控制沙丘地貌的三大要素.沉积物尤其是沙源供应对沙丘地貌的影响仍有待深入研究.沙丘体积的研究促使了等效沙厚度(equivalent sand thickness,EST)概念的提出.EST研究经历了多个沙丘和亚沙丘尺度2个研究阶段.多个沙丘EST研究发现,EST与沙丘高度之间具有较好的一致性,其与方...     

东海三定点周日海流观测的准调和分析

应用短期资料的潮流准调和分析方法,对东海三定点测站获得的表、中、底3层的25h连续海流资料进行了分析,计算了3测站O1,K1,M2,S2,M4,MS4 6个主要分潮的北、东分量潮流调和常数,并给出了各测站在各层的潮流椭圆要素。计算结果表明：该海区潮流属于正规半日潮流性质,半日分潮流的北分量大于东分量,呈现旋转流的性质,按顺时针向旋转。分析结果也反映出表层、中层的浅水分潮在观测海流中所占的份额高于底层的浅水分潮。结果有助于了解该海区的潮流性质并为潮流数值模拟提供校验实测数据。通过与同期获得的悬浮物浓度剖面数据的比对,将有助于研究潮流与该地区悬浮泥沙浓度分布之间的关系。     

川中地区中二叠统栖霞组滩控岩溶型白云岩储层特征及主控因素

四川盆地中部地区栖霞组的白云岩是该区主要储层,储层成因的主流观点是热液白云岩化.目前勘探实践发现,优质储渗体形成与早期相控岩溶作用有关.通过取芯及测录井资料进行了详细分析,研究结果表明,该类白云岩储层主要位于栖霞组中上部颗粒滩发育的地层中,按其宏微观产出状态可分为溶斑状云岩、溶洞充填云岩、针孔状基质云岩和致密基质云岩....     

Wavelet analysis and nonparametric test for climate change in Tarim River Basin of Xinjiang during 1959–2006

Using wavelet analysis, regression analysis and the Mann-Kendall test, this paper analyzed time-series (1959–2006) weather data from 23 meteorological stations in an attempt to characterize the climate change in the Tarim River Basin of Xinjiang Uygur Autonomous Region, China. Major findings are as follows: 1) In the 48-year study period, average annual temperature, annual precipitation and average annual relative humidity all presented nonlinear trends. 2) At the 16-year time scale, all three climate indices unanimously showed a rather flat before 1964 and a detectable pickup thereafter. At the 8-year time scale, an S-shaped nonlinear and uprising trend was revealed with slight fluctuations in the entire process for all three indices. Incidentally, they all showed similar pattern of a slight increase before 1980 and a noticeable up-swing afterwards. The 4-year time scale provided a highly fluctuating pattern of periodical oscillations and spiral increases. 3) Average annual relative humidity presented a negative correlation with average annual temperature and a positive correlation with annual precipitation at each time scale, which revealed a close dynamic relationship among them at the confidence level of 0.001. 4) The Mann-Kendall test at the 0.05 confidence level demonstrated that the climate warming trend, as represented by the rising average annual temperature, was remarkable, but the climate wetting trend, as indicated by the rising annual precipitation and average annual relative humidity, was not obvious.     

Effects of salinity fluctuation amplitudes on growth, osmolarity, Na＋-K＋-ATPase activity and Hsp70 of juvenile Chinese shrimp Fenneropenaeus chinensis Osbeck

The effects of various salinity fluctuation amplitudes (2, 4, 6 and 8) on the growth, osmolarity, Na⁺-K⁺-ATPase activity and Hsp70 of juvenile Fenneropenaeus chinensis cultured in seawater with a salinity of 20 were studied. The results show that weight gain in the salinity fluctuation treatments was better than that in control; in particular, the weight gain of treatments S4 and S0, at 231.8% and 196.3%, respectively, was significantly different (P<0.05). The hemolymph osmolarity of treatments S0, S2, S4, S6 and S8 was 635.4, 630.8, 623.6, 614.4 and 600.3 mOsm/kg, respectively, and decreased with increasing salinity fluctuation amplitude. The level of Na⁺-K⁺-ATPase activity in gills of F. chinensis was higher than that in hepatopancreas, but there were no significant differences among all treatments, either in gills or hepatopancreas (P>0.05). The relative level of Hsp70 in treatment S4 was 48.4% and 40.4% higher than control in muscle and eyestalks, respectively, with the highest values being recorded under a salinity fluctuation amplitude of 4.     

山东梁邹矿业集团充分利用尾矿的成功实践

山东梁邹矿业集团有限公司,位于山东省邹平县境内。由邹平钼业有限公司、邹平铭兴化工有限公司、邹平铭波电源有限公司、邹平铭扬建材有限公司、邹平碑楼铜业有限公司、邹平铭远贸易进出口有限公司组成,是集铜钼采选、精细化工、充电电池、建筑材料、进出口贸易和职工现代服务等为一体的综合性企业集团。其中,钼业公司、化工公司属省二级安全标准化企业,钼业公司是山东省唯一铜钼采选企业,在2000年国家统计局公布的全国最大100家有色金属采选企业中排名第32位。     

ArcGIS Server在构建企业级地理信息系统中的应用

文中主要讨论了ArcGIS Server的体系构架与部署、内部利用ArcGIS Server核心ArcObjects实现软件功能的运行机制,以及利用ArcGIS Server提供ADF(应用程序开发框架)开发Web应用的方法,从而通过Internet/In-tranet实现GIS的各种高级功能如制图、空间分析和地理编码、多用户编辑等。最后通过简单的程序示例,演示了如何在VisualStudio2005.NET下利用ADF实现GIS应用开发。     

GPS控制网正常高的精度与可靠性指标评定

采用传统GPS高程拟合方法得到的高程,其精度和可靠性指标难以评定,结合实例利用水准测皱限差和精度的概念评定GPS高程网的精度,使用GPS网可靠性指标评定GPS高程网的可靠性,并采用水准网平差方法计算GPS高程网.     

测绘资源在规划建设管理中的优化使用

测绘资料所反映的地形、地貌、交通、水系、资源分布等基础地理信息是城镇规划建设管理中空间和功能布局十分重要的依据.因此,测绘是规划的基础和依据,充分整合利用现有测绘资源,统一基础地理信息平台,保持空间位置的统一性和精确性,实现测绘资源的共建共享,将极大地减少重复劳动,降低规划建设管理的成本.