Impairment in long-term retention but not short-term performance on a water maze reversal task following hippocampal or mediodorsal striatal n-methyl-d-aspartate receptor blockade.

Male Long-Evans rats were injected with 32 ng/μl of the N-methyl-D-aspartate (NMDA) receptor antagonist 3-(2-carboxypiperazin-4-yl) propyl-1-phosphonic acid (CPP) or vehicle and trained to locate a hidden platform in a different location (reversal training) than used on the initial 4 days of training. Rats treated with vehicle or CPP into the dorsal hippocampus, basolateral amygdala, or mediodorsal striatum had similar latencies to locate the platform on the reversal day. Rats infused with CPP into the dorsal hippocampus or mediodorsal striatum failed to search preferentially in the novel location during a 24-hr, drug-free retention test, whereas all other groups searched preferentially in this location. Therefore, blocking dorsal hippocampal or mediodorsal striatal NMDA receptors selectively blocked long-term spatial retention without producing short-term performance deficits. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

An elliptical disc anchor in a damage‐susceptible poroelastic medium

A flat rigid elliptical anchorage located in a damage‐susceptible fluid‐saturated poroelastic medium is subjected to an in‐plane load, which induces a pure translation in the plane of the anchor. This paper develops computational estimates for the time‐dependent displacement of the disc anchor for the classical problem that involves Biot consolidation and compares the results with situations where the porous skeleton can experience micro‐mechanical damage that leads to an alteration in both its elasticity and fluid transport characteristics. Copyright © 2005 John Wiley & Sons, Ltd.     

微编纱单向热塑复合材料复合固化过程的研究

针对由微编纱制成的单向热塑复合材料的复合固化过程进行了研究，建立了试样厚度与复合材料空隙率的关系模型；通过在线测量试样厚度的变化，得出了树脂渗透速度、复合材料的空隙率与工艺条件(温度、压力、时间)及纱线几何结构的关系。     

土壤的固结效应及精细积分数值求解

基于广义Biot固结理论，利用有限元离散方法，得到土层固结效应的u-p形式的基本方程，进而通过引入基本方程中原变量的对偶变量，在Hamilton体系下建立了土层固结效应的微分方程。在具体计算过程中，利用时程精细积分方法，对固结问题进行了计算，并通过数值算例说明了中方法的有效性。     

堆载预压法处理道路软基加固机理简析

运用有效应力原理分析堆载预压处理道路软基的有效应力变化规律,并对堆载预压加固软基的强度增长规律和软基压缩变形原理进行分析,同时应用应力路径方法分析堆载预压引起的土体侧向变形。并根据堆载预压处理道路软基加固机理对某道路软基堆载预压处理的检测效果进行了分析。     

强夯法在电厂湿陷性黄土地基处理中的应用

对山西省某电厂地基强夯法处理湿陷性黄土地基的经验做了介绍，主要包括在强夯施工过程中的强夯试验、施工方案的选择及施工过程中的具体问题及其处理效果，可供类似工程的设计和施工借鉴。     

层状粘土地基上柔性条形基础的 Biot 固结沉降分析

采用层状粘土地基模型模拟实际地基的土层参数随深度按层状变化的情况，采用Ｌａｐｌａｃｅ－Ｆｏｕｒｉｅｒ联合变换和传播矩阵技术，由Ｂｉｏｔ固结方程导出了层状粘土地基固结变形的位移，应力及其柔性条形基础沉降的解极表达式．给出的公式简洁明了，计算精度高，计算量小．文末给出了实例计算的数值结果．     

Making Beliefs Coherentl. The Subtraction and Addition Strategies.

The notion of epistemic coherence is interpreted as involving not only consistency but also stability. The problem how to consolidate a belief system, i.e., revise it so that it becomes coherent, is studied axiomatically as well as in terms of set-theoretical constructions. Representation theorems are given for subtractive consolidation (where coherence is obtained by deleting beliefs) and additive consolidation (where coherence is obtained by adding beliefs).     

Block preconditioners for symmetric indefinite linear systems

This paper presents a systematic theoretical and numerical evaluation of three common block preconditioners in a Krylov subspace method for solving symmetric indefinite linear systems. The focus is on large‐scale real world problems where block approximations are a practical necessity. The main illustration is the performance of the block diagonal, constrained, and lower triangular preconditioners over a range of block approximations for the symmetric indefinite system arising from large‐scale finite element discretization of Biot's consolidation equations. This system of equations is of fundamental importance to geomechanics. Numerical studies show that simple diagonal approximations to the (1,1) block K and inexpensive approximations to the Schur complement matrix S may not always produce the most spectacular time savings when K is explicitly available, but is able to deliver reasonably good results on a consistent basis. In addition, the block diagonal preconditioner with a negative (2,2) block appears to be reasonably competitive when compared to the more complicated ones. These observation are expected to remain valid for coefficient matrices whereby the (1,1) block is sparse, diagonally significant (a notion weaker than diagonal dominance), moderately well‐conditioned, and has a much larger block size than the (2,2) block. Copyright © 2004 John Wiley & Sons, Ltd.     

白鹤梁题刻本体保护工程设计

对白鹤梁题刻本体保护工程设计进行了论述.在整体加固工程上,实施小锚杆加固、砌筑支护和裂隙灌浆;在表面加固工程上,采用注射粘结和滴渗透增强相结合的工艺;在表面防冲蚀工程上采用双面层方案,下层为柔性保护层,保护题刻不被损伤,上层为刚性防冲蚀保护层,面层以锚固方式与岩体连结,以确保面层自身的稳定性.