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排序方式: 共有903条查询结果,搜索用时 15 毫秒
111.
网格GIS及其在数字油田中的应用探讨 总被引:5,自引:0,他引:5
数字油田是解决当前油田智能化管理问题的最好途径。该文分析了当前油田建设中所面临的问题,结合油田在勘探开发中的实际需要,特别就当前数字油田建设中所面临的共性问题,在分析现有油田技术及发展需求的基础上,指出了基于中间件的分布式网格GIS技术是解决当前数字油田领域中所存在的问题的最佳方式,并讨论了其实现过程。 相似文献
112.
Stephen K. Donovan A.J. de Winter 《Proceedings of the Geologists' Association. Geologists' Association》2019,130(5):582-589
The fossil echinoderms of the Lower Carboniferous (Mississippian) of Derbyshire remain understudied, principally due to the nature of the preservation rather than any lack of biodiversity. Echinoids and crinoids are described in float blocks of limestone from near Hurdlow, Derbyshire, which have been etched naturally after many years of being washed by weakly acidic rain. Surface detail is variable, commonly poor, but rare specimens retain enough features for tentative identification. Two species of echinoids are identified from rare disarticulated plates, namely Melonechinus? sp. (ambulacral plates) and archaeocidarid sp. (interambulacral plate); more and superior material will be necessary to confirm this division. Crinoids include a cladid brachial ossicle sp. with a distinctive sculpture; a columnal of a monobathrid camerate platycrinitid sp.; Annulocolumnus (col.) sp. cf. A. annulus Donovan, a columnal morphotaxon with an unusually broad axial canal; and Cyclocyclicus (col.) spp. This is the tenth echinoid site to be recognized from the Mississippian of the White Peak. Examination of etched float blocks provides a further method of investigation of the echinoderm fauna of this and other limestone areas. 相似文献
113.
Xiaotu Lei Xuefen Zhang Wansuo Duan Hong Li Zhiqiu Gao Chuanhai Qian Bingke Zhao Jie Tang 《地球科学进展》2019,34(7):671-678
The lack of sufficient direct observation data of typhoon fine structure is the main bottleneck that restricts the further development of typhoon discipline and forecasting. This paper briefly introduced the basic information of the National Key R&D Program of China, entitled “Experiment on Coordinated Observation of Offshore Typhoon in China”, which started in early 2019. Firstly, the importance and necessity of the program around the national needs on typhoon-related disaster reduction and prevention were explained. Then, the coordinated observation difficulties and frontiers in the current typhoon discipline situation from the development and improvement of the physical mechanism and key forecasting technologies were shown. The overview of the direct observation instrument and platform, the field campaign and the parameterization techniques related to physical process in typhoon numerical modeling was provided. Finally, the key scientific and technical issues and main research contents of the program were given. 相似文献
114.
煤层构造岩顶板稳定性初探 总被引:2,自引:0,他引:2
河南登封煤田郜城井田二1煤层顶板为滑动构造形成的构造岩,岩石破碎,结构松散,极难管理。为寻求合理有效的管理方法,通过宏观观察、镜下鉴定和岩石组构分析等研究,该顶板自下而上可分为断层泥、断层角砾岩、构造破碎带和裂隙带;断层角砾岩分为张性角砾岩和剪性角砾岩,它们是在深层塑性形变的基础上迭加了后期浅层脆性形变的产物。通过工程地质特性试验,其泥化现象明显。针对断层泥软化、膨胀、崩解和泥化现象,应用短段、快速掘砌法施工,严格排水措施,减少岩帮暴露时间,岩帮开挖压力释放槽等方法减缓膨胀;对张性角砾岩围岩,采用工作面预注浆加固,先锚喷后作永久支护办法减少围岩松动;顶板采用密集木支柱支护或迫使冒落法管理。 相似文献
115.
高灵敏度太赫兹探测模块(High Sensitivity Terahertz Detection Module, HSTDM)是中国空间巡天望远镜---巡天光学设施的后端模块之一, 其核心探测器采用可工作于10K温区的氮化铌超导SIS (Superconductor Insulator Superconductor)混频器. 超导SIS混频前端的锁定机构在力学和热学方面需相应的特殊设计, 以应对发射阶段的力学振动以及工作运行阶段的隔热要求. 为了确认在80K温区锁定机构与混频器前端有效分离, 针对超导SIS混频前端发射锁定机构所用特氟龙材料热胀特性, 开展基于低温LVDT (Linear Variable Differential Transformer)测量和标记划痕法测量以及两种测量方法交叉验证. LVDT实验测量结果表明特氟龙材料收缩率随温度变化与理论模型基本一致, 在80K测得材料收缩率为1.86%. 据此分析, 超导SIS混频前端锁定机构在\lk 80K温度下可与10K冷级的超导SIS混频前端实现有效分离. 相似文献
116.
胶东乳山金矿区原生晕地球化学特征及深部成矿预测 总被引:1,自引:0,他引:1
英格庄金矿以相对富As、Co、Ni而三甲和铜锡山金矿则以相对富Cu、Pb、Zn、Ag为特征.聚类分析显示,英格庄金矿具Bi+Hg、As+Sb+Co与Pb+Zn组合,三甲金矿具Bi+Hg+As+Sb+Co、Pb+Zn与Ag+Cu+Au组合,而铜锡山金矿则显示Bi+Hg+Sb+Pb+Ag、Cu+Au+Zn+As及Mo+Ni组合.结合Ni、Co、Mo与Ag、Hg、As、Sb等的相关特征,认为上述三个金矿均有成矿头尾晕叠加现象.Au、Ag、Cu、Pb、Zn、As、Sb、Bi、Hg、Mo等元素垂向变化规律显示,英格庄金矿在-200m标高以下、三甲金矿在-500m标高以下尚有成矿富集段存在.其中,所确定的英格庄金矿的靶位在16勘探线附近,三甲金矿的靶位则在16~20勘探线间. 相似文献
117.
118.
Rapid cooling and geospeedometry of granitic rocks exhumation within a volcanic arc: A case study from the Central Slovakian Neovolcanic Field (Western Carpathians)
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U–Pb Sensitive High‐Resolution Ion MicroProbe (SHRIMP) dating of zircon in combination with (U–Th)/He dating of zircon and apatite is applied to constrain the emplacement and exhumation history of the youngest granitic rocks in the Western Carpathians collected in the Central Slovakian Neovolcanic Field. Two samples of diorite from the locality Banky, and granodiorite from Banská Hodru?a yield the U–Pb zircon concordia ages of 15.21 ±0.19 Ma and 12.92 ±0.27 Ma, respectively, recording the time of zircon crystallization and the intrusions’ emplacement. Zircon (U–Th)/He ages of 14.70 ±0.94 (Banky) and 12.65 ±0.61 Ma (Banská Hodru?a), and apatite (U–Th)/He ages of 14.45 ±0.70 Ma (diorite) and 12.26 ±0.77 Ma (granodiorite) are less than 1 Myr younger than the corresponding zircon U–Pb ages. For both diorite and granodiorite rocks their chronological data thus document a simple cooling process from magmatic crystallization/solidification temperatures to near‐surface temperatures in the Middle Miocene, without subsequent reheating. Geospeedometry data suggest for rapid cooling at an average rate of 678 ±158 °C/Myr, and the exhumation rate of 5 mm/year corresponding to active tectonic‐forced exhumation. The quick cooling is interpreted to record the exhumation of the studied granitic rocks complex that closely followed its emplacement, and was likely accompanied by a drop in the paleo‐geothermal gradient due to cessation of volcanic activity in the area. 相似文献
119.
E. Schmutzer 《Astronomische Nachrichten》2000,321(3):137-155
Recently the 5‐dimensional Projective Unified Field Theory (PUFT) of the author (Schmutzer 1995a, Schmutzer 1995b) has been applied to a closed homogeneous isotropic cosmological model with the result of a cosmology without big bang (Schmutzer 1999a, Schmutzer 1999b). Continuing this approach, in this paper following subjects are treated: recalculation of numerical values of cosmological quantities, exact solution of the field equations to a point‐like body, motion of a test body in such a field, definition of the empirical effective gravitational factor (“constant”), Einstein effects compared to the empirical situation, adiabatic approximation of the motion of an orbiting testbody under the influence of the expanding cosmos (transition of the ellipses to circles, decrease of the radius of the orbiting bodies, decrease of the excentricity, increase of the frequency of orbiting objects etc.), heat production in a moving body induced by the cosmological expansion with application to various cosmic objects. 相似文献
120.