oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2020 ( 4 )

2019 ( 352 )

2018 ( 5944 )

2017 ( 6078 )

Custom range...

Search Results: 1 - 10 of 262733 matches for " 李胜 "
All listed articles are free for downloading (OA Articles)
Page 1 /262733
Display every page Item
利用跟踪数模研究蒸汽驱剩余油及蒸汽腔变化特征
 [PDF]


Journal of Oil and Gas Technology (JOGT) , 2015,
Abstract:
蒸汽驱热采技术是开发稠油油藏的重要技术工艺。河南稠油油藏具有“浅、薄、稠、散” 的特 点,加之蒸汽本身超覆和窜流的弊端,使得蒸汽驱后剩余油分布更为复杂。为了研究蒸汽驱过程中剩余 油分布及蒸汽腔变化特征,综合评价蒸汽驱阶段开发效果,选择了河南新庄油田新浅45断块8个蒸汽驱 井组进行跟踪分析。在对目标区块三维地质模型进行精细刻画的基础上,对区块注蒸汽开发全过程进行 实时动态跟踪模拟,再现温度场和饱和度场的变化特征,描述蒸汽前缘及蒸汽腔的扩展变化规律,分析 和评价目的层吸汽状况和汽驱井组受效特征。研究结果表明:由于受蒸汽超覆、射孔层位先后顺序以及 注采工作制度的综合影响,与Ⅱ油组2小层相比,Ⅱ油组3小层注采井间热连通程度较高,蒸汽波及范围 较广,蒸汽腔更为发育;蒸汽腔的形成使得储层驱油效率倍增,波及范围内含油饱和度下降明显;其扩 展方向将受生产井工作制度、储层非均质性和流体渗流阻力等多种因素的影响而具有明显的方向性。该 研究为新浅45断块蒸汽驱后续注采参数调整及提高采收率技术应用提供了调整依据。
考虑变热传导系数和粘性系数的MHD驻点流问题研究
Effects of Variable Thermal Conductivity and Viscosity on MHD Stagnation-Point Flow
 [PDF]


International Journal of Fluid Dynamics (IJFD) , 2016, DOI: 10.12677/IJFD.2016.44009
Abstract: 本文研究了考虑变热传导系数和粘性系数的二维定常MHD驻点流动问题。其中热传导系数和粘性系数是温度的函数。通过相似变换,将N-S控制方程组转化为常微分方程组;再利用打靶法计算此常微分方程组的数值解。分别对不同的磁场参数、流体粘性参数和普朗特数进行了数值计算,详细分析了磁场效应和温度变化对壁面摩擦系数、壁面传热及流场特征等的影响。
The two-dimensional MHD stagnation-point flow with variable thermal conductivity and viscosity is studied. The thermal conductivity and viscosity are considered as functions of temperature. The governing Navier-Stokes equations are transformed into a set of ordinary differential equations (ODEs) by similarity transformation. The transformed ODEs are solved numerically using shooting method. Numerical calculations for various magnetic parameters, fluid viscosity parameters and Prandtl numbers are carried out, and the effects of magnetic strength and temperature changes to the skin friction coefficient, heat transfer near the wall and flow field characteristics are discussed in detail.
瞬变种的HeI紫外光电子能谱(UPS)——一个氯原子的HeI光电子谱

科学通报 , 1995,
Abstract: 近年来,南极臭氧空洞的出现在世界不但引起科学界,而且引起政治界的广泛关注.为了保护人类赖以生存的环境,阻止臭氧空洞的的扩大和修补破损的空洞已经成为人类迫在眉睫的重任之一.在人类排放的众多消耗大气臭氧的物质中,氯里昂是一类重要的化合物.在大气条件下,它们经过一系列化学反应和光解反应得到的产物物种可直接导致臭氧层的破坏.但是,臭氧与氟里昂反应的反应通道和机理目前还不清楚.
整合昆虫发育生物学和果蝇遗传学来研究昆虫发育与变态

应用昆虫学报 , 2007,
Abstract: 成熟动物(昆虫)个体大小主要由生长持续时间和生长速度2个因素所决定。蜕皮激素和保幼激素协同调控昆虫发育变态,并决定昆虫生长持续时间;胰岛素、营养和细胞接触抑制等生长死亡信号及其传导途径控制细胞分裂、长大、分化、死亡,并最终决定昆虫的生长速度。最近研究成果表
傅立叶红外光谱及拉曼光谱技术在宝玉石鉴定方面的应用

矿物岩石 , 2002,
Abstract:
膨胀机制冷在大庆油田气脱水净化中的应用

天然气工业 , 1984,
Abstract: ?本文简要介绍膨胀机制冷原理及大庆油田膨胀制冷脱水装置的试验情况.实践证明,在高寒地区,低压油田伴生气采用膨胀机制冷脱水在技术上是可行的,在经济上是合算的.
番茄汁雪糕的开发生产

食品科学 , 1993,
Abstract: ??<正>番茄汁是维生素a原和维生素c的重要来源,其胡萝卜素约比橙汁多4倍,每100毫升的番茄汁中约含维生素c15~25毫克.番茄汁的无机盐含量相当高,是铁、镁、铜的良好来源.番茄汁雪糕既含有牛奶中的蛋白质和矿物质,又含有番茄汁中的维生素和其他营养素,是一种营养比较全面的冷饮制品.
一种新型扇面关联度分析法及在油气田开发定量化类比中的应用
A New Type of Sector Correlation Analysis Method and Its Application in Quantitative Analogy of Gas Oil Field Development
 [PDF]

, 杨莉,
Advances in Energy and Power Engineering (AEPE) , 2016, DOI: 10.12677/AEPE.2016.44016
Abstract:
本文提出一种用于油气田地质油藏特征及开发指标定量化类比的扇面关联度分析法。该方法首先进行目标油气田地质油藏特征分析和主控因素确定。在此基础上,统计目标油气田和类比油气田的主控参数,建立扇面坐标系,设立主控参数置信度序列,并对扇面坐标系进行调整。然后,在扇面坐标系中绘制目标油气田和各类比油气田的扇面图,并筛选出相似油气田。之后,采用考虑置信度约束条件下的扇面关联度分析法进行目标油气田与多个相似油气田的关联度计算,通过关联度大小对油气田相似程度进行定量化排序,从而最终确定高度相似的油气田。该方法可以从图形和解析两方面定量化精确定位与目标油气田相似度最高的类比油气田,并据此用类比油气田开发策略和实际的开发效果对目标油气田的开发方案制定提供依据,具有较好的实际应用价值。
In this paper, a new type of sector correlation analysis method that can be applied in quantitative analogy of characteristics and development index of gas oil fields is proposed. Firstly, the engineers should analyze the reservoir characteristics and ascertain the dominant control factors, and on this basis, collect the dominant control data of the target gas oil field and analogous gas oil fields, establish the sectoral coordinate, set the dominant control data confidence level sequence and adjust the coordinates correspondingly, then, draw the sectors of the target gas oil field and the analogous fields in the sectoral coordinate and screen out the similar fields. Based on these sector data, the correlation between the fields can be calculated by use of the sector correlation analysis method considering the confidence level sequence. After sorting the value of sector correlation, the similarity degree between the fields and the most similar field can be determined finally. The new type of sector correlation analysis method can be applied in quantitative position of the best analogous gas oil field graphically and analytically, which provides the referential basis to determine the development plan of target field from the development strategies and effect of the analogous fields and has good practical application value.
色噪声和周期激励下肿瘤细胞增长系统的随机共振
Stochastic Resonance in a Tumor Cell Growth System Driven by a Colored Noise and Periodic Excitation
 [PDF]

, 刘子铭,
Applied Physics (APP) , 2015, DOI: 10.12677/APP.2015.511020
Abstract:
本文研究了色噪声驱动下肿瘤细胞增长系统的随机共振现象,根据Novikov定理和统一色噪声理论,得到了相应的FPK方程,并给出了稳态概率密度函数的表达式。运用绝热近似理论,得到了信噪比的解析表达式。结果表明,在噪声强度较小时产生了随机共振,且其强度随着增长率和周期作用振幅的增大而增强,而承载能力对随机共振强度没有显著影响,但承载能力越大,要达到共振所需要的噪声强度也越大。
In this paper, stochastic resonance in a tumor cell growth system driven by a colored noise and periodic excitation is investigated. According to Novikov theorem and unified colored noise theory, the related Fokker-Plank equation and the stable probability density function are obtained. Based on theory, we present the explicit expression of signal-to-noise ratio. Conclusions are that: stochastic resonance produced as noise strength is little and its strength is increased as tumor cell growth rate and amplitude of periodic effect are increased respectively. But the carrying capacity has no obvious impact on the strength of stochastic resonance, however, the more carrying capacity is, the more the required noise strength to attain stochastic resonance is.
文化与变化着的景观结构

地理科学进展 , 1996,
Abstract: 文化不仅改变着景观,而且通过景观来体现。景观生态学包含着这种动态的两个方面,但是,这两个方面在景观生态学领域内从来没有引起足够的注意,因而没有形成文化理论。本文阐述了景观生态学的四个主要的文化原理,在这些主要原理之下还可得出更确切的一些原理。一个根本的中心前提就是文化与景观在一个反馈环中相互影响:文化建造各种景观,同时景观影响文化。本文提出如下四个主要原理:(1)人的景观感知(Perception)、认识(congnition)和准则(Values)直接影响着景观,同时也受景观的影响。(2)不仅在居住景观中,而且很明显地在自然景观中,文化习俗强烈地影响着景观格局。(3)自然的文化概念不同于生态功能的科学概念。(4)景观外貌与文化准则互通。 作为获得更确切的文化原理的方法,这里建议在人类尺度上研究景观,以及进行可能景观(Possible landscape)的试验。
Page 1 /262733
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.