"瓮安生物群特征及其环境演化"研究取得重要进展

"瓮安生物群特征及其环境演化"是中国地质调查局科外部下达的基础研究工作项目,针对近年来我国早期生命研究的热点之一"瓮安生物群"进行多学科深入研究.     

北部湾涠洲岛南湾火山砂岩捕虏体光释光(OSL)测年结果

涠洲岛是北部湾内的一座火山岛,火山活动初步可以分为早-中更新世和晚更新世2期。晚期南湾火山是典型的射气岩浆喷发成因的火山,文中报道了南湾火山的上、下2层火山碎屑岩中砂岩捕虏体的光释光(OSL)测年结果,提出南湾火山喷发时代为距今约3万年左右的晚更新世末期     

储层结构控制下的开发响应特征初探--以双河油田为例

储层结构体现在层次性和拼合性2个方面.双河油田含油层段在地质层次上划分为10级:地层段、油层组、小层、单层、单砂体、成因砂体、成因增量、层系组、层系和纹层,体现了各级次的地质作用.拼合性体现为储层由不同的要素相互镶嵌叠置而成,其中较重要的是结构要素的规模及其空间匹配.基于储层的这种层次性和拼合性,形成了相应的储层剖面和平面预测模型,在区内划分出4类剖面模型样式和6类平面模型样式.不同的模型样式体现了不同的内部结构特征,而这种结构特征影响注水开发过程中的流体流动,进而形成不同的剩余油气分布样式.     

青城子小佟家堡子、林家金矿成矿流体特征及成矿机制

小佟家堡子、林家金矿是青城子铅锌、金、银矿集区的中-大型金矿床,金矿床与沉积-变质期硅化岩关系密切。通过与矿区尖山岩体、新岭岩体中流体包裹体对比研究表明,金矿床与尖山岩体中主要发育水溶液包裹体,极少量的CO2包裹体、含CO2三相包裹体,而新岭岩体除发育以上包裹体外,还发育含子矿物多相包裹体。测温结果显示金矿床成矿流体温度为110～335℃,盐度3．9％～16．2％NaClrq拉曼光谱分析表明金矿床流体成分以H2O为主,少量的CO2、CH4等气体,表明成矿流体属NaCl-H2O体系。金矿床与尖山岩体中流体包裹体温度、盐度及成分相近,推断成矿流体主要来自沉积-变质期。     

Mesozoic Bimodal Volcanic Suite in Zhalantun of the Da Hinggan Range and Its Geological Significance： Zircon U-Pb Age and Hf Isotopic Constraints

1 Introduction Mesozoic volcano-intrusive rocks are widely distributed in the Da Hinggan Range of northeastern China, and are considered as one of the most spectacular geological sights in eastern Asia. Recently, studies on granites with high εNd(t) values and Phanerozoic crustal growth in the Centra Asian Orogenic Belt have greatly promoted fundamental research into the geology of this area (Jahn et al., 2000, 2001, 2004; Wu et al., 2000, 2002, 2003). However, work on the eruption time,…     

大直径环式组合潜孔锤及钻进工艺研究

论述了大直径嵌岩桩孔钻进的现状、发展趋势,阐述了大直径环式组合潜孔锤的工作原理、结构设计、钻进工艺方法,对设计加工的HC-15型环式组合潜孔锤钻具进行了室内模拟试验,并对试验结果进行分析总结.     

青藏铁路填土路基热-力耦合离散元研究

多年冻土是含有冰的特殊土体,在自然环境变化及工程扰动下易发生冻胀融沉变形,严重威胁着青藏高原工程建筑物的安全稳定,特别对青藏铁路的畅通运营提出了严峻挑战.以青藏铁路五道梁地区路基断面为研究对象,采用颗粒离散单元法,通过建立热-力离散元计算模型,对路基的温度场和变形进行了计算和预测.结果表明:离散单元法克服了有限元方法无...     

市级基础测绘在城市应急服务中的应用

本文从市级基础测绘与城市应急系统的关系入手,分析了城市应急系统对基础测绘的需求．从而指导市级基础测绘工作更好地为城市应急服务。     

Development and application of simulation technique for hydrokinetic hammer

The computer simulation is an important method for hydrokinetic hammer design. Various kinds of simulation measures with their technical characters and applications being taken during the computer aided design are enumerated. Computer simulation supports plenty of valuable references to the designer. Each type of simulation process is used to explore the exact aspect of the performance of hydrokinetic hammer and each type of simulation method has its own excellences and deficiencies. Thus the integrative simulation methods based on modern computational technology are brought forward to obtain the perfect capability of the whole product. Along with the development of computer hardware and software, various kinds of platforms have been provided to different simulation methods that can be carried out with distinct working flows. The jet flow element is the core part of the hydrokinetic hammer. We can build the ideal simulation model of it by means of CFD (computational fluid dynamics) technology. On the other hand, to set up the digital model of piston and hammer, the best way is to build the virtual prototype using automatic dynamic analysis of mechanical system. As a result of the argumentation, we think the technique of Virtual Prototype and CFD are the prime way to process the combined computer simulation for hydrokinetic hammer.     

胸部多排螺旋CT扫描在肋软骨隆鼻术整形中的临床应用研究

目的:探讨胸部多排螺旋CT扫描在肋软骨隆鼻术中的应用价值.方法:收集符合纳入标准120例拟行自体肋软骨隆鼻术患者,都进行了胸部多排螺旋CT术前检查,并进行多种三维重建分析自体肋软骨是否符合手术标准,部分病例进行了术后CT复查评估.结果:CT准确评估肋软骨无钙化(1级)28例和轻度钙化(2级)62例,均可行自体肋软骨隆鼻...