钙质砂地基中桶形基础水平动载响应实验研究

针对钙质砂地基中桶形基础动态响应问题进行了实验研究。首先进行了水平静极限承载力实验,获得了水平载荷位移曲线,并为确定水平动载荷幅值的选择提供参考;然后针对主要因素,包括桶形基础尺寸、载荷幅值和频率、土体密度、压重等,进行了系列的室内小模型实验,并对结果进行了分析,获得了水平动载下桶形基础在钙质砂地基中的响应特点。结果表明:载荷幅值、频率、土体密度、桶形基础尺寸对动态响应有明显影响;动载下桶形基础周围钙质砂中孔压上升,但是较其他类砂土中的慢;在结构重量小时,桶形基础上升;有上覆较硬粘土层时,桶形基础和地基的响应减弱。     

Exploring the Brain's Interface Between Personality, Mood, and Emotion: Theoretical Comment on Canli et al. (2004).

T. Canli et al., 2004 (see record 2004-19432-002) use functional MRI to explore the neural interface between personality, mood, and emotional responses. Their finding of a double dissociation in brain response to emotional stimuli based on personality and mood state has significant implications for our understanding of the effects of personality traits and mood states on the neural bases of emotion and cognition. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Ordinal Representation of Numeric Quantities by Brown Capuchin Monkeys (Cebus apella).

Using techniques established by E. M. Brannon and H. S. Terrace (2000) with rhesus macaques (Macaca mulatta), the authors tested the ability of brown capuchins (Cebus apella) to order arrays of items ranging in quantity from 1 to 9. Three monkeys were trained on a touch screen to select the quantities 1-4 in ascending order. The monkeys exhibited successful transfer of this ability to novel representations of the quantities 1-4 and to pairs of the novel quantities 5-9. Patterns of responding with respect to numeric distance and magnitude were similar to those seen in human subjects, suggesting the use of similar psychological processes. The capuchins demonstrated an ordinal representation of quantity equivalent to that shown in Old World monkeys. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

特高压拉线式悬索塔风洞试验研究

拉线式悬索塔由双立柱支撑结构及拉线悬索系统组成,在概念和设计上均较为简洁。然而由于其高耸特点,因此是风敏感结构。为测试该类结构的风振响应特点,进行了塔线体系气动弹性模型的风洞试验。试验结果表明:在紊流风场中,立柱的顺风向风振响应与横风向属于同一量级;随风速增加,背风侧拉线趋向松弛,背风侧立柱受压减小;而迎风侧拉线则越趋张紧,迎风侧立柱受压增加,因此,需特别关注迎风侧拉线断线及迎风侧立柱受压稳定问题。     

地震作用下仰斜式挡墙的动力响应分析

为了研究地震作用下仰斜式挡墙的地震响应,本文利用数值分析软件Plaxis建立二维数值模型,施加汶川卧龙地震波,分析了不同烈度地震作用下仰斜式挡土墙的地震动响应,得出了以下结论：首先,在不同地震烈度作用下,以仰斜式挡土墙底部为基准,挡墙的中部为加速度和加速度反应谱放大性的转折点,即墙底至0.5倍墙高范围内,水平加速度沿墙高逐渐减小,而在0.5倍墙高至墙顶范围内,水平加速度沿墙高逐渐增加;随着地震烈度的增加,墙后填土的傅里叶谱具有低频放大的效应;地震波的能量沿墙高向上逐渐减小.     

移动载荷作用下斜拉桥结构的动态响应计算分析

运用斜拉桥的近似分析方法,将漂浮体系的斜拉桥结构简化成两端简支且中间离散弹性支撑梁、变地基系数梁和均匀地基系数地基梁三种模型。建立了移动载荷作用下斜拉桥结构的动力学方程,用四阶龙格库塔法对动力学方程进行了计算,对三种模型的固有频率和三种模型在相同移动载荷作用下的动态响应进行了比较,并对移动载荷移动速度、垂直振动的刚度和阻尼对桥梁动态响应的影响进行分析。结果表明,当拉索等效弹性系数较小时,三种模型的固有频率和挠度曲线差别较小,当拉索等效弹性系数较大时,三种模型的固有频率和挠度曲线差别明显;桥梁动态响应的频谱由桥梁的固有频率和移动载荷的自振频率组成;移动载荷垂直振动的刚度越大,阻尼越小,桥梁振动的响应越大。     

William A. Hunt (1903–1986).

William A. Hunt was one of our country's early scientist-clinicians. He began his career with study of a psychology that was a meld of Titchener's structuralism and Harvard's functionalism and completed it 50 years later in the field of health psychology. Hunt spent all but a few of those 50 years as a full-time teacher, at schools that included Dartmouth College, Connecticut College for Women, and Northwestern University. While doing his dissertation, he had mastered and used the structuralist's experimental method of introspection, applying it to the study of human emotion, specifically the James-Lange theory. In 1941, Hunt entered the Navy. He discerned that the screening for military duty of some 15 million women and men required an approach suited to the rapid, albeit individual, screening of large numbers of such personnel. His teaming up with a psychiatrist, Cecil Wittson, led to their joint development of a screening interview lasting one to two minutes that, with continued refinement, proved remarkably effective. Their goals as the mental health specialists participating in the medical examination conducted at this intake station were twofold: (a) to improve the efficiency of the Navy by removing those neuropsychiatric high-risk recruits who were potential psychiatric casualties if they continued in the Navy and (b) by such removal, to save these recruits the disastrous personal experience of subsequent breakdown during military duty. In his own still active research in the 1960s and 1970s Hunt continued to apply the same methods he earlier had used (in his Navy research) to the judgmental processes clinical psychologists used to identify psychological test responses that were pathognomonic of schizophrenia, mental retardation, and related forms of psychopathology. Hunt remained, until his death at age 82, an active scientist-clinician. (PsycINFO Database Record (c) 2010 APA, all rights reserved)