低渗透油田表面活性剂增注效果预测方法研究

针对低渗透油田在注水开发过程中注入压力高、压力传导慢等问题,室内进行了表面活性剂相对渗透率和天然岩心降低注入压力等实验研究。实验结果表明,在水驱基础上,天然岩心注入浓度为0.5%的NS—1表面活性剂后,后续水驱压力降低25%以上,降压效果明显。根据油水相对渗透率曲线,在油水两相径向稳定渗流条件下,对表面活性剂增注效果、段塞尺寸与增注量的关系等进行了预测。     

基于低碳经济的碳排放与经济发展研究——以重庆市为例

为了解重庆直辖以来经济发展与碳排放量之间的相互关系,以重庆市直辖以来1997－2008年为研究时间段,对重庆市经济发展与碳排放量进行了相关性分析研究.研究时间段内重庆市碳排放总量增加了2.43倍,碳排放增长变化过程分为两类:波动下降阶段(1997－2000年和2005—2008年);稳定上升阶段(2000－2005年)...     

Influence of Low Temperature Dyeing Accelerant on Acrylic Fiber Dyed with Cationic Dyes

The dyeing behavior of cationic dyes to acrylic fiber with self-made low temperature dyeing accelerant was investigated in this study.Compared with conventional dyeing,the acrylic yarn was dyed with Cationic Turquoise Blue X-GB at 85℃ in the presence of accelerant and absence of accelerant,respectively.The influence of low temperature dyeing accelerant on the dyeing mechanism of acrylic fiber dyed with cationic dye was analyzed through kinetics and thermodynamics study.The results show that adding dyeing accelerant can heighten the equilibrium dye-uptake,dyeing rate constants,diffusion coefficients,and shorten half-dyeing time for acrylic fiber dyed with cationic dyes.Furthermore,the partition coefficient,the standard affinity,and the dye saturation value also increased in the dyeing at 85 ℃.     

逐步后退选择法预测低渗透油藏水井吸水量

利用低渗透油田注水井的地质和动态统计资料,建立多元回归统计数学模型,采用逐步选择因素的后退法,求解最优化回归预测方程,对影响吸水量的各因素按作用效果显著程度进行了排序,利用水井资料对所得到的最优化回归方程进行了检验。结果表明,水井连通度是影响水井吸水量最主要因素,储层渗透率次之。     

龙泉煤矿矿井低浓度瓦斯利用方案研究

对国内外瓦斯利用技术进行了综述,分析了龙泉煤矿低浓度瓦斯利用现状,在此基础上提出了3种低浓度瓦斯利用方案,并对其相应的投资及效益进行了研究,指出充分利用抽出的瓦斯不但可以使煤矿增加新的利润增长点,而且可以减少大气污染,具有良好的经济效益和社会效益。     

探讨在低碳经济下如何节约降低空调加湿的能耗

在生态危机及环境恶化的压力下,发展低碳经济既是国际大背景,更是我国自身经济发展的必由之路。具体到暖通行业,从空调系统的设计运行中通过改进设计理念,采用新产品,运行维护中实现多方面可调节以及能源的回收以及再利用等五种手段可以做到切实减少能源的浪费。     

Efficient and Low-Latency Systolic Array Architecture for Full Searches in Block-Matching Motion Estimation

IntroductionEmerging applications such as interactive videocommunication,digital broadcasting,and digitalstorage media require video compression.Thecomputational complexity requires hardware forreal time processing.A central component of video compression isthe motion estimation unit,which exploits thetemporal redundancy of a video sequence.Block-matching,the most popular motion estimationmethod,searches for a motion vector thatminimizes the distortion error between amacroblock of a frame to b…     

浅谈低噪声路面类型及其适用性

文章在分析交通噪声的产生和危害的基础上，总结了各种类型低噪声路面的路面结构、材料组成特点及各其降噪机理，继而探讨了各种低噪声路面的适用性。     

低渗透油藏水锁伤害机理及解水锁实验研究*

针对地层压力低（压力系数小于1）、油井含水率低（小于50%）的低渗油井，水锁伤害普遍存在的问题，研究了毛细管效应和贾敏效应对产生水锁现象的机理认识。通过实验数据结果分析，得到了水锁现象与渗透率的关系，即：渗透率越低，水锁程度越严重，10.00 mD以下的岩芯，压力升高值基本在25%左右，而大于10.00 mD的岩芯压力升高值在15%左右。注入表面活性剂后，解除水锁效果非常明显，特别是渗透率越低，效果越明显，最高驱替压力值下降幅度达到了近50%。说明表面活性剂对解水锁具有很好的效果。     

Construction of protograph LDPC codes with circular generator matrices

The application of protograph low density parity check(LDPC) codes involves the encoding complexity problem.Since the generator matrices are dense,and if the positions of "1" s are irregularity,the encoder needs to store every "1" of the generator matrices by using huge chip area.In order to solve this problem,we need to design the protograph LDPC codes with circular generator matrices.A theorem concerning the circulating property of generator matrices of nonsingular protograph LDPC codes is proposed.The circulating property of generator matrix of nonsingular protograph LDPC codes can be obtained from the corresponding quasi-cyclic parity check matrix.This paper gives a scheme of constructing protograph LDPC codes with circulating generator matrices,and it reveals that the fast encoding algorithm of protograph LDPC codes has lower encoding complexity under the condition of the proposed theorem.Simulation results in additive white Gaussian noise(AWGN) channels show that the bit error rate(BER) performance of the designed codes based on the proposed theorem is much better than that of GB20600 LDPC codes and Tanner LDPC codes.