Erratum to “Mineral waters in Slovakia — Evaluation of chemical composition stability using both historical records and the most recent data” [J. Geochem. Explor. 107 (2010) 382–390]     

Dušan Bodiš  Jozef Kordik  Igor Slaninka  Peter Malík  Pavel Liščák  Daniel Panák  Jarmila Božíková  Daniel Marcin 《Journal of Geochemical Exploration》2011,108(3):233

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Organic geochemical characterization and depositional paleoenvironments of the Devonian strata in Guizhong region,Guangxi, China     

Mao  ZhiChao  Du  YuanSheng  Zhang  Min  Yan  JiaXin  Zeng  Fang 《中国科学:地球科学(英文版)》2010,52(1):88-95

Devonian strata in the Guizhong region, Guangxi, China consist mainly of marine deposition carbonates (limestones and dolomites) as well as restricted clastic rocks. The strata thickness is measured as 2041m and classified into 14 formations. An integrated field geological, petrographic, sedimentological, palaeobiological, and geochemical study of these strata reveals that the depositional paleoenvironments were carbonate tidal flat, restricted platform, open platform, shelf, platform margin slop, and algal herm. The total organic carbon (TOC) of sedimentary organic matter ranges between 0.07% and 1.96% with average of 0.21%. The organic matter types are Type I and Type III. The vitrinite reflectance (R ₀) of kerogen ranges between 0.99% and 2.03%, indicating the maturated and highly maturated stages. The analytical results of the representative samples collected from shelf and subtidal facies show that the differences of organic matter type and biological diagnostic compounds are related to the types of source rocks deposited in different paleoenvironments.

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The Characteristics of Near-surface Velocity During the Upwelling Season on the Northern Portugal Shelf   总被引：1，自引：0，他引：1  

ZUO Juncheng DU Ling Alvaro Peliz A. Miguel Santos YU Yifa 《中国海洋大学学报(英文版)》2007,6(3):213-225

Observations made on the northern Portugal mid-shelf between May 13 and June 15,2002 were used to characterise the near-surface velocity during one upwelling season. It was found that in the surface mixed layer,the 'tidal current' was diurnal,but the tidal elevation was semi-diurnal. Both the residual current and the major axes of all tidal constituents were nearly perpendicular to the isobaths and the tidal current ellipses rotated clockwise;the major axis of the major tidal ellipse was about 3 cm s-1. The extremely strong diurnal current in the surface layer was probably due to diurnal heating,cooling,and wind mixing that induced diurnal oscillations,including the diurnal oscillation of wind stress. This is a case different from the results measured in the other layers in this area. The near-inertial spectral peaks occurred with periods ranging from 1 047 min to 1 170 min,the longest periods being observed in deeper layers,and the shortest in the surface layer. Weak inertial events appeared during strong upwelling events,while strong inertial events appeared during downwelling or weak subinertial events. The near-inertial currents were out of phase between 5 m and 35 m layers for almost the entire measurement period,but such relationship was very weak during periods of irregular weak wind. Strong persistent southerly wind blew from May 12 to 17 and forced a significant water transport onshore and established a strong barotropic poleward jet with a surface speed exceeding 20 cm s-1. The subinertial current was related to wind variation,especially in the middle layers of 15 m and 35 m,the maximum correlation between alongshore current and alongshore wind was about 0.5 at the 5 m layer and 0.8 at the 35 m layer. The alongshore current reacted more rapidly than the cross-shore current. The strongest correlation was found at a time lag of 20 h in the upper layer and of 30 h in the deeper layer. The wind-driven surface velocity obtained from the PWP model had maximum amplitude of about 7 cm s-1,corresponding to a wind stress at 0.1 Pa,and the horizontal velocity shear due to thermal wind balance had the order of 3 cm s-1. So the local wind and thermal wind would only explain a part of the strong surface velocity variations.  相似文献   

一种基于神经网络的确知信号检测技术     

方彪  程卫东 《成都信息工程学院学报》2007,22(4):518-521

建立在统计信号处理理论基础上的相关检测器和匹配滤波器取得了广泛的应用,但两种模型都是建立在对实际通信信道线性化近似基础上的,在适应信道的非线性变化方面有所不足.利用神经网络自适应、非线性和高速并行运算的特点,在此提出了一种结构简单有效的神经网络接收机,并可推广到其他确知信号.  相似文献   

临沂市全力打造阳光土地整理市场     

冯连伟  刘洪建  杜源泉  苏超 《山东国土资源》2007,23(9):38-39

土地开发整理是利在当代、功在千秋的“造福工程”，各级政府投入了大量的资金，如何把好事办好是摆在国土资源部门面前的一件大事。自2002年以来，临沂市实施国家和省、市、县4级土地开发整理复垦项目1200余个，项目总规模达10万余公顷，新增耕地2万余公顷，有力地支持了当地经济和社会的发展，土地开发整理成为实实在在的富民工程、德政工程、民心工程。2007年4月，山东省土地开发整理工作会议在临沂市莒南县召开，临沂市国土资源局在会上介绍了建立阳光土地整理市场的经验和做法。  相似文献   

Nonextensivity and the power-law distributions for the systems with self-gravitating long-range interactions     

Du Jiulin 《Astrophysics and Space Science》2007,312(1-2):47-55

By a natural nonextensive generalization of the conservation of energy in the q-kinetic theory, we study the nonextensivity and the power-law distributions for the many-body systems with the self-gravitating long-range interactions. It is shown that the power-law distributions describe the long-range nature of the interactions and the non-local correlations within the self-gravitating system with the inhomogeneous velocity dispersion. A relation is established between the nonextensive parameter q≠1 and the measurable quantities of the self-gravitating system: the velocity dispersion and the mass density. Correspondingly, the nonextensive parameter q can be uniquely determined from the microscopic dynamical equation and thus the physical interpretation of q different from unity can be clearly presented. We derive a nonlinear differential equation for the radial density dependence of the self-gravitating system with the inhomogeneous velocity dispersion, which can correctly describe the density distribution for the dark matter in the above physical situation. We also apply this q-kinetic approach to analyze the nonextensivity of self-gravitating collisionless systems and self-gravitating gaseous dynamical systems, giving the power-law distributions the clear physical meaning.   相似文献   

鞍山东山风景区3．8—2．5Ga古老岩带的同位素地质年代学和地球化学   总被引：18，自引：0，他引：18  

万渝生  李惠民等 《地质学报》2001,75(3):363-370

鞍山东山风景区古老岩带呈巨型包体存在于立山奥长花岗岩（3．1Ga）中，其主体为条带状片麻岩（3．8Ga）。此外还有金云母透闪石岩、（含）黑云斜长角闪岩、闪长质片麻岩、变石英闪长质岩石、细粒奥长花岗岩、二长花岗岩、伟晶岩脉等。测定了部分岩石的锆石年龄，其中变石英闪长质岩石（A9604）为3．65Ga（Wan et al.,1999），闪长质片麻岩（A9317）为3．5Ga、二长花岗岩（类型I，A9605）为3．1Ga，黑云斜长角闪岩（A0019）为3．3Ga、细粒奥长花岗岩（A0017）为3．2Ga、二长花岗岩（类型Ⅱ，A0020），为2．6Ga，有关岩石的地球化学组成特征在文中地进行了简要介绍，在此基础上，提出了该古老岩带的地质同位素年代演化序列，认为鞍山地区不同时代、不同成因地质体空间上共存是该芡长期地质演化的结果，而不是后期构造作用把它们拼合到一起的，鞍山地区很可能存在＞3．8Ga的古老地壳岩石。  相似文献   

会东县老炉房特大型岩崩发育特征及稳定性分析     

沙德智  陈关顺  杜静虹 《四川地质学报》2001,21(3):177-179

对老炉房特大型岩崩的形成特征作了论述，对岩崩的规模、成因、危害性及发展趋势作了分析，提出了防灾的具体意见。  相似文献   

Blast Damage and Blast Dilution Control: The Application of Bulk Emulsion Systems at the WMC St Ives Junction Mine     

T. M. Law  J. May  A. T. Spathis  A.T. Du Plessis  A. M. Palmer 《Fragblast: International Journal for Blasting and Fragmentation》2001,5(1):1-20

The application of modern bulk emulsion explosive systems at an underground gold mine resulted in a 57% improvement in gold dilution. While this improvement is impressive and could be expected to be achieved at other sites, the work required to assess and demonstrate the benefits is painstaking. Forty-eight rings involving a total of approximately 50 000 tonnes of ore were monitored using various modern surveying instruments over a 6-month period. The geometric data included blasthole locations and deviation, and the cavity monitoring of stopes. Implementation of a bulk emulsion system not only provided logistical benefits but it also has the desirable explosive properties associated with reducing the effects of blast damage and blast dilution.  相似文献   

青藏高原对中国西部自然环境地域分异的效应   总被引：9，自引：11，他引：9       下载免费PDF全文

郑度 《第四纪研究》2001,21(6):484-489

近几百万年以来青藏高原的强烈隆升对中国西部地区自然环境地域分异的影响十分明显。它强化了自第三纪以来西北地区的干旱化 ,形成山地湿岛与荒漠绿洲并存 ,导致亚洲干旱核心区域的出现。藏东南水汽通道作用显著 ,横断山区发育着独特的干旱河谷。山地垂直带谱类型的分布模式揭示了青藏高原自然景观的地带性分异规律 ;高原地势格局和大气环流的共同作用 ,制约着高原本身自然地域分异的特点 ,形成独特的自然地域系统格局。  相似文献