超完善井条件下三重介质试井解释模型求解方法

无论是均质油藏还是碳酸盐岩油藏试井解释模型,求解时负表皮系数会引起早期数据的不稳定。将Ramey提出的无限大均质油藏负表皮系数计算方法推广至具有边界的多重介质油藏,即引入折算半径的同时,对无因次时间、井筒储存系数、窜流系数以及测试井到边界的距离进行修正。计算结果表明,利用该方法求解解释模型,早期数据不发散、稳定性好。     

如何发挥企业集团资产优势

论述了企业集团如何发挥资产优势的问题，重点对企业集团资产运营中存在的问题进行了多角度的分析和探讨。     

计算机软件专业项目教学改革方案探讨与实施

文章从探索项目教学法在计算机软件专业岗前项目实践教学中应用研究的角度,阐述了项目教学法在软件开发实践教学中的应用方法,并针对在教学中存在的问题提出了应对措施,体现了软件实践教学中的一种新的现代教育理念、教学方法和教学模式。     

地海交界环境与其上方双目标复合散射的混合算法研究

采用蒙特卡罗方法建立地海交界分区域复合粗糙面模型,陆地区域采用高斯谱模拟,近海海面区域采用基于变浅系数的北海海浪工程(joint North Sea wave project, JONSWAP)谱模拟;提出了基于分形理论的边界赋形方法,并运用多种反正切权函数处理实现了线型、月牙型、峡谷型和分形型边界的地海交界环境;基于矩量法和基尔霍夫近似的混合算法研究了地海交界环境与其上方双目标的复合电磁散射特性,对比了双目标分别位于两种典型环境和地海交界环境上方时的复合散射系数曲线,研究了复合散射系数随入射角、陆地区域参数、海面参数、边界形状、双目标参数及双目标类型的变化情况,并做了详细分析与讨论。结果表明该混合算法的高效性和准确性,数值仿真结果对地海交界环境上方目标的探测、遥感及成像具有借鉴意义。     

陶瓷湿度传感器永久性老化机理分析

本文经过实验对陶瓷湿度传感器永久性老化机理作了分析。文中认为,多孔半导瓷的表面在潮湿气相中存在着极薄的水膜,有溶解、析晶过程和污染上的杂质离子与晶粒表面离子的交换过程;在干燥气相中有蒸发、凝结过程。这些过程导致表面活性离子的替代、溶解和蒸发,使半导瓷表面活性降低,造成永久性老化。     

建筑结构动力反应分析过程仿真表现方法

为了更好表现建筑结构动力仿真分析结果，研究利用多媒体表现技术与工程结构分析算法相结合的仿真表现新方法。论文阐述在复杂工程仿真中，运用体绘制算法，变形绘制算法，定性数据表达方法，快速绘制算法和连续仿真场景生成方法，特别是综合应用达到最优表现。具体说明了论文的方法在实现钢筋混凝土框架结构在地震作用下的结构动力反应的仿真表现中的实际效果，验证了这种仿真表现方法的有效性。在以Windows2000为操作系统，以OpenGL作为开发工具的微型机上实现这种复杂仿真表现，展现了多媒体仿真表现技术广阔的应用和发展前景。     

Effect on membrane transport in the erythrocytes by band 3 cross-linking

Band 3 and glucose transport protein (GluT1) are two kinds of important proteins in the human erythrocyte membranes. Bis(sulfosuccinimidyl)suberate (BS³), an impermeable cross-linker of band 3, inhibited NO₂ ⁻ transport, showing that anion exchange is affected by the association state of band 3 in the intact erythrocyte membranes. At the same time, the rates of glucose transport of both exit and entry declined. The amount of monomers of band 3 was decreased after treatment of the erythrocytes with BS³, but there was no change in GluT1 according to the SDS-PAGE patterns. This demonstrates that band 3 and GluT1 would be linkaged together in the erythrocyte membranes for the requirement of rapid and cooperative performance of physiological functions of the membrane proteins.     

基于Hopfield网络单元机组负荷多变量模型算法控制

电厂负荷系统是一个有耦合和约束的多变量对象。模型算法控制(MAC)是预测控制的一种，在惯性迟延对象的控制中有很好的应用。该文提出用Hopfield网络来求解具有约束的多变量负荷系统的控制输入。仿真表明，该方法算法简单、鲁棒性强、控制效果理想。     

Alternative splicing and expression of the insulin-like growth factor （IGF-1） gene in osteoblasts under mechanical stretch

Insulin-like growth factor 1 (IGF-1) promotes osteoblasts differentiation and bone formation, and its expression is induced by mechanical stretch, thus IGF-1 has been considered an effector molecule that links mechanical stimulation and local tissue responses. In this study, a mechanical stretching device was designed to apply physiological level static or cyclic stretching stimulation to osteoblasts. Different isoforms of IGF-1 mRNA were amplified by RT-PCR from the cells using respective primers and these amplified products were sequenced. An iso-form of IGF-1 splicing product was found to be selectively produced by osteoblasts under stretching stimulation. This IGF-1 isoform had identical sequence with the mechano growth factor (MGF) which was originally identified in muscle cells. Regulations of the expression of the liver-type IGF (L.IGF-1) and MGF in osteoblasts under stretch stimulation were further studied using semi-quantitative RT-PCR. Stretch stimulation was found to promot the expression of IGF-1 (L.IGF-1 and MGF), and for both isoforms expression was more effectively stimulated by cyclic stretch than static stretch. MGF was detected only in osteoblasts subjected to mechanical stretch, suggesting MGF was a stretch sensitive growth factor. Expression of MGF peaked earlier than that of L.IGF-1, which was similar to their regulation in muscle and suggested similar roles of MGF and L.IGF-1 in bone as in muscle cells. The functions of MGF and LIGF-1 in osteoblasts shall be established by further experimental studies.     

体育教育要深化内在层面的功能

体育教育有其外在层面和内在层面。既强调“育”在外在层面的提高，又要有“育”在内在层面的深化。体育教育对于人的意志品质、心理素质培养尤为重要，它不仅能激发学生克服困难、超越自我、奋发向上的力量，还有培养团队精神，公平竞争、诚信等道德品行的内在功能。