城口震旦系岩石学特征及沉积环境分析

介绍了四川城口震旦系剖面的划分方案、岩石类型及岩石学特征,讨论了沉积环境。认为该区早震旦世明月期处于上扬子陆块北缘山前临海盆地的陆相环境;晚震旦世陡山沱期为潮坪—海湾环境,灯影早期为泻湖-广海陆棚-潮坪环境,灯影晚期则从浅水陆棚转变为深水陆棚环境。     

中亚造山带大陆动力学边程与成矿作用

本文简述了国家973计划项目“中亚造山带大陆动力学过程与成矿作用”（2007CB411300）的总体框架、研究思路和研究目标。对项目已开展的研究工作和研究进展进行了总结。目前,项目组已在以下4个方面展开了研究工作并取得了一系列重要进展：（1）中亚造山带增生、体制转换与改造大陆动力学过程;（2）中亚造山带壳幔相互作用与巨量金属堆积机理;（3）中亚造山带典型矿集区壳幔结构的深部地球物理探测;（4）大陆增生成矿理论框架的构建和矿集区预测与隐伏矿床识别。     

大陆强震机理与预测研究综述

本文对 973项目“大陆强震机理与预测”研究作了综述 ,介绍了项目研究的科学背景、总体科学思路、研究内容和科学目标。项目经过 5年的研究 ,提出了中国大陆活动地块科学假说 ,并应用于描述中国大陆现今地壳运动的特征和机制 ,探索大陆强震的发生机理和预测方法 ;项目并在地震预测流动实验场研究、强地震预测研究和重要经济区地震灾害预测研究等方面取得了一系列重要进展。这些研究成果已经在地震监测和地震减灾中初步得到应用     

Developing the plate tectonics from oceanic subduction to continental collision

The studies of continental deep subduction and ultrahigh-pressure metamorphism have not only promoted the development of solid earth science in China, but also provided an excellent opportunity to advance the plate tectonics theory. In view of the nature of subducted crust, two types of subduction and collision have been respectively recognized in nature. On one hand, the crustal subduction occurs due to underflow of either oceanic crust （Pacific type） or continental crust （Alpine type）. On the other hand, the continental collision proceeds by arc-continent collision （Himalaya-Tibet type） or continent-continent collision （Dabie-Sulu type）. The key issues in the future study of continental dynamics are the chemical changes and differential exhumation in continental deep subduction zones, and the temporal-spatial transition from oceanic subduction to continental subduction.     

Detachment within subducted continental crust and multi-slice successive exhumation of ultrahigh-pressure metamorphic rocks: Evidence from the Dabie-Sulu orogenic belt

Although tectonic models were presented for exhumation of ultrahigh-pressure （UHP） metamorphic rocks during the continental collision, there is increasing evidence for the decoupling between crustal slices at various depths within deeply subducted continental crust. This lends support to the multi-slice successive exhumation model of the UHP metamorphic rocks in the Dabie-Sulu orogen. The available evidence is summarized as follows： （1） the low-grade metamorphic slices, which have geotectonic affinity to the South China Block and part of them records the Triassic metamorphism, occur in the northern margin of the Dabie-Sulu UHP metamorphic zone, suggesting decoupling of the upper crust from the underlying basement during the initial stages of continental subduction; （2） the Dabie and Sulu HP to UHP metamorphic zones comprise several HP to UHP slices, which have an increased trend of metamorphic grade from south to north but a decreased trend of peak metamorphic ages correspondingly; and （3） the Chinese Continental Science Drilling （CCSD） project at Donghai in the Sulu orogen reveals that the UHP metamorphic zone is composed of several stacked slices, which display distinctive high and low radiogenic Pb from upper to lower parts in the profile, suggesting that these UHP crustal slices were derived from the subducted upper and middle crusts, respectively. Detachment surfaces within the deeply subducted crust may occur either along an ancient fault as a channel of fluid flow, which resulted in weakening of mechanic strength of the rocks adjacent to the fault due to fluid-rock interaction, or along the low-viscosity zones which resulted from variations of geotherms and lithospheric compositions at different depths. The multi-slice successive exhumation model is different from the traditional exhumation model of the UHP metamorphic rocks in that the latter assumes the detachment of the entire subducted continental crust from the underlying mantle lithosphere and its subsequent exhumation as a whol     

基于有线元法的数控卧式重型车床中心架结构分析

针对重型车床的加工特点介绍了车床床身的分体式结构,在建立有限元模型的基础上,对中心架极限工况下的应力、应变进行分析,确定薄弱环节,评估设计的安全可靠性,为中心架的设计和制造提供理论依据.     

壳聚糖-蒙脱土复合涂膜在常温下对荔枝货架期及品质的影响

在室温下评估了壳聚糖和壳聚糖-蒙脱土(MMT)涂膜对荔枝存放8天的失重率、硬度、可溶性固形物、维生素C、可滴定酸含量、果皮褐变、多酚氧化酶活性和过氧化物酶活性的影响.未进行涂膜处理的荔枝作为对照组.壳聚糖和壳聚糖-蒙脱土涂膜处理的荔枝失重率显著低于对照组.与壳聚糖涂膜和对照组的荔枝相比,壳聚糖-蒙脱土涂膜能有效保持荔枝...