收藏和购买翡翠的误区

其实翡翠有使用和收藏两种“功效”，重点在于如何识别市场误区。     

湖南矿物宝石市场15年淘金史

＂这些辛苦和挫折在今天也常常遇到,但是,毕竟,我们已经走出去了,有了自己的一片天空,再累再苦,我们也会坚持到底,让中国的五星红旗永远在国际矿物宝石市场飘扬。＂夏卫平动情地说。     

越南东京湾红河断裂系统

本文利用经过钻井资料校准的地震剖面研究了东京湾海防海域的红河断裂系统。该断裂系统在VinhMirth断层西南部表现为30km宽的狭长的左行走滑带，其运动时间为30Ma-5．5Ma，走滑位移不会超过几十公里，没有识别出5．5Ma之后的右行走滑运动。30Ma之前存在一个100km宽的伸展带，这次伸展作用可能与左行运动有关。30Ma之前，断裂系统在VinhMinh断层东北方向的分叉很可能刻E部湾的裂谷作用所吸收。15．5Ma的不整合将该区张扭体系与晚期的压扭体系分开，这个不整合的年代与南海海底扩张停止的时间是一致的。     

两税“省直管县”遏制土地财政？

“两税”下放，自然有利于充盈县市财政，至于和诟病已久的“土地财政”有何关联？是遏制“土地财政”还是助推“土地财政”，抑或两者的关系“剪不断理还乱”？     

玉树地震析因新说都是月亮惹的祸？

玉树地震已经过去一月有余，时间的流逝并未让中华大地对死难者的痛惜缅怀之情有所消退，但却让更多的人开始思考研究起这一悲剧的祸因——地震。确实，过去的几年，这一天灾似乎在以罕见的密度频繁光顾人类世界，从汶川到海地、从台湾到玉树，如此高频率高伤亡的灾害无法不让人视为大敌，研究地震成因、找出其规律所在也成为人类自救所必须要做的。     

湖湘地脉的大学生触摸之旅

2010年6月25日——第20个＂全国土地日＂当天,来自中南大学、湖南大学、湘潭大学等省内高校的十支大学生调研队伍分赴省内各地展开了针对湖南国土资源省情的一次大规模调研。此次大学生国土资源调查活动由湖南省国土资源厅宣传中心和团省委联合发起,     

Dynamic Analysis for the Global Performance of An SPM-Feeder-Cage System Under Waves and Currents

In the present study, the dynamic response of a coupled SPM-feeder-cage system under irregular waves and shear currents is analyzed. A numerical model is developed by using the commercial software Orca Flex. Hydrodynamics coefficients of the vessel are calculated by using a 3D diffraction/radiation panel program. First- and second-order wave forces are included in the calculations. Morison equation is used to compute the drag force on line elements representing the net. Drag coefficients are determined at every time step in the simulation considering the relative normal velocity between the structural elements and the fluid flow. The dynamic response of the coupled system is analyzed for various environments and net materials. The results of the study show the effects of solidity ratio of the net and vertical positions of the cage on the overall dynamic response of the system, confirming the viability of this type of configuration for future development of offshore aquaculture in deep waters.     

The Shishugou Fauna of the Middle–Late Jurassic Transition Period in the Junggar Basin of Western China

The Middle–Late Jurassic transition period is a critical period for the evolution of terrestrial vertebrates, but the global fossil record from this time is relatively poor. The Shishugou Fauna of this period has recently produced significant fossil remains of dinosaurs and other vertebrate groups, some representing the earliest known members of several dinosaurian groups and other vertebrate groups and some representing the best-known specimens of their group. These discoveries are significant for our understanding of the origin and evolution of several vertebrate lineages. Radiometric dating indicates that the fauna is aged approximately 159–164 Ma. Comparisons with other similarly-aged terrestrial faunas such as Shaximiao and Yanliao show both taxonomic similarities and differences between these faunas and indicate that the Junggar deposits might have preserved the most complete vertebrate fossil record for a Middle–Late Jurassic Laurasian terrestrial fauna.     

Detrital Zircon Records of the Banxi Group in the Western Jiangnan Orogen: Implications for Crustal Evolution of the South China Craton

The Neoproterozoic evolution of the Jiangnan Orogen is important for understanding the tectonic history of South China. As a volcanic-sedimentary sequence developed in the Nanhua rift, the Banxi Group preserves the records of important magmatic and tectonic events linked to the assembly and breakup of the Rodinia supercontinent. In this study, we report the results from whole-rock major-and trace-element concentrations, with zircon LA-(MC)-ICP-MS U-Pb ages, trace elements and Lu-Hf isotopic comp...