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Search Results: 1 - 10 of 385021 matches for " 王晓安 "
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中国蛤蜊神经系统显微结构的初步研究
,蒋小满
动物学杂志 , 1999,
Abstract:
多肠目薄背涡虫的胚胎发育
,于梅
动物学杂志 , 2008,
Abstract: 薄背涡虫(Notoplanahumilis)的产卵高峰期在春末夏初。胚胎发育为螺旋式卵裂、外包法形成原肠胚,以大卵裂球储存卵黄。14~16℃下约20d左右幼虫由卵膜中孵化,但不是典型的牟勒氏幼虫。幼虫经历一周左右的浮游生活和两周左右的底栖生活后,逐渐发育为涡虫幼体。
复杂地层注蒸汽热采稠油数值模拟的研究
Research on Numerical Simulations of Heavy Oil Thermal Recovery by Steam Injection
 [PDF]

,, 刘志峰, 贾江涛, 吴斌
Advances in Porous Flow (APF) , 2013, DOI: 10.12677/APF.2013.31001
Abstract:

本文对多孔介质中多相流动数值计算格式构造及复杂地层注蒸汽热采稠油自适应网格法方面的研究工作给予介绍。对于非均匀渗透率多孔介质中的流动问题,通过有限分析法构造数值格式,有效克服了网格结点附近渗流速度的奇点效应,和经典数值格式相比,计算效率得到了显著提高。从B-L方程出发,对于不可压缩两相流动,提出了数值模拟算法,该算法有效避免了两相渗流数值模拟的网格取向效应。对于复杂断层及复杂边界、渗透率空间分布不均匀、分布不同种类输运性质岩石或裂缝–孔隙双重介质等复杂地层中的注蒸汽热采稠油自适应网格法开展研究,大幅度提高了计算速度。在上述研究工作的基础上,自主开发了油藏数值模拟自适应网格法计算软件。


The works on the developments of the numerical scheme for multi-phase flows in porous media and the adaptive mesh refinement in numerical simulations of heavy oil thermal recovery by steam injection are introduced. First, a finite analytic method was developed to deal with a challenging problem in numerical simulations in the case of strong geological heterogeneity, which cause the upscaling permeability to have a rapid change cross the grid interfaces and therefore the nodal flow effects will lead the flow fingering to the high permeability region. With the traditional numerical scheme, refining the coarse grid enough is the only manner to describe the flow pattern accurately. Second, for the incompressible two-phase flows, a numerical scheme, which could avoid the grid orientation effects efficiently, was proposed. Next, the adaptive mesh refinement technique was applied to the numerical simulations for the processes of thermal recovery by steam injection, where the different heterogeneous cases of the reservoir were considered, like the reservoir with the permeability variations, the different rock-types, the fractured porous media, the complex faulted reservoir or complex boundary reservoirs. The proposed AMR technique is fast and can give good accuracy. At last, on the basis of above theoretical research, a software package for the reservoir simulations, where the AMR technique was included, was developed.


基于磁悬浮技术的“通天桥”航天运载系统
“Heaven Bridge” Space Transportation System Based on Magnetic Levitation Technology
 [PDF]

姬聪云, 南英, 闻新, , , 袁伟, 胡欣欣
Journal of Aerospace Science and Technology (JAST) , 2014, DOI: 10.12677/JAST.2014.24008
Abstract:
本文提出一套新型的航天运载系统,即“通天桥”航天运载系统。基于真空磁悬浮原理,结合我国目前磁悬浮列车的技术储备与发展,对真空管道的实现、磁悬浮管道的构建、磁悬浮方式的选择等进行了深入研究。结合我国得天独厚的地理优势,“通天桥”系统中航天器脱离管道地点设置在喜马拉雅山脉的顶峰。当航天飞行器脱离“通天桥”系统之后,采用火箭发动机,最终航天运载器以7.9 km/s的速度进入太空预定轨道。仿真结果表明,与传统航天运载器相比,该“通天桥”航天运载系统在提高航天器的有效载荷率、重复使用性,节能环保和运载安全等方面有独特的优势。
A new concept of the space transportation system is presented, namely “Heaven Bridge” space transportation system. Based on the development of maglev train in our country, this new space transportation system is composed of vacuum magnetic levitation pipeline, flight transportation vehicle, and other equipment on the ground. Combing with the unique geographical advantage, launching spot of “Heaven Bridge” is located at the top of Himalayas Mountain in China. When spacecraft separates from the “Heaven Bridge” system, the spacecraft can be boosted by rocket engines and then reach the appointed target orbit in space at the speed of 7.9 km/s. Comparing with the traditional space transportation systems, this new concept system “Heaven Bridge” pro-vides with the following excellent properties: skyscraping efficiency payloads, reusable and recy-cling, environmental-friendly, safety transportation and so on.
昆虫一氧化氮及其合酶的研究进展
,郑哲民
应用昆虫学报 , 2003,
Abstract: 一氧化氮作为一种重要的信息分子,参与调节昆虫嗅觉、视觉、机械感受、发育、机体防御及学习行为。该文从生理、生化、形态定位以及信号转导几方面综述了有关昆虫一氧化氮及其合酶的最新研究进展。
高动态多普勒频率的最大似然估计器
,柯有
北京邮电大学学报 , 2000,
Abstract: 采用泰勒级数展开的形式表示高动态的多普勒频率参数,推导并实验分析了对各阶频率参数估计的最大似然估计器(MLE);计算机模拟采用FFT处理方法,给出了算法对所模拟的接收机动态的估计均方根误差和失锁概率.
紫彩血蛤鳃的组织化学和扫描电镜研究
孙虎山,
动物学杂志 , 1999,
Abstract:
扁玉螺中枢神经系统解剖及显微结构观察
冼黎,,张丽莉
动物学杂志 , 2007,
Abstract: 对扁玉螺(Neveritadidyma)中枢神经系统的大体解剖和显微结构进行了初步研究。结果表明,扁玉螺中枢神经系统包括一对口球神经节、一对脑神经节、一对侧神经节、一对足神经节及一个脏神经节。各神经节均由神经节被膜、胞体区及中央纤维网三部分组成。左右脑神经节之间和左右足神经节之间的联合以及脑-侧、脑-足和侧-足神经节之间的连索均较短。足神经节有明显的分区现象。
河北环毛蚓神经系统一氧化氮合酶的组织化学定位
,郑哲民
动物学杂志 , 2002,
Abstract:
嫁(虫戚)神经系统结构的初步研究
,傅更锋
动物学杂志 , 1998,
Abstract:
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