Escape behavior in the cockroach: Distributed neural processing

Summary Escape reactions are often considered to be among the simplest behaviors. The nerve circuits guiding these reactions are also generally thought to be simple. For instance, in several species a single interneuron is sufficient to trigger normal escape. The evasive response of the cockroach, however, appears to be more complex both behaviorally and physiologically. In this review, several complications of the behavior are pointed out, based on a recent computer-graphic analysis of the leg movements. Next described is the cooperative role of several interneurons-not just one-in evoking an escape turn away from the stimulus. A model of this multicellular code for stimulus direction is then presented that correctly predicts the turning behavior under many different experimental conditions. Finally, an overall scheme of the information processing for escape behavior is presented.     

在拓扑混合映射下轨迹对于时间的异常依赖性

本文指出在拓扑混合映射的定义域中有非常多的点的轨迹呈现出一种对于时间高度异常的依赖性,即若f:X→X是一个拓扑混合映射,其中X是一个由无限多个点组成的紧緻度量空间,则对于任何正整数递增序列{q_i}和X中任何稠密的可数集S,存在着X的一个c-稠密子集C满足条件:(1)对于任何s∈S,序列{q_i}有一个子序列{q_i}使得(?)(y)=s对于任何y∈C成立,(2)对于任意n>0,C中任意n个点y_1,y_2,…,y_n,和X中任意n个点x_1,x_2,…,x_n,序列{q_i}有一个子序列{t_i}使得(?)(y_j)=x_j,对于每一个j=1,2,…,n成立。     

The role of the substantia nigra on the rage reaction elicited by hypothalamic stimulation,in the cat

Summary The effects of substantia nigra stimulation on the rage reaction evoked by hypothalamic activation were studied. The reference value of the rage reaction was the latency of the hissing, which was constant in all animals when hypothalamic stimulation was performed with the same parameters. Simultaneous activation of substantia nigra and hypothalamus determined a significant decrease in hissing latency. The influence of the substantia nigra on the affective components of the aggressive behavior is underlined.This work was supported by a grant from the Consiglio Nazionale delle Ricerche Roma, Italy.     

基于主体行为选择的猪肉生产组织模式分析

在分析猪肉生产的两个关键主体(加工企业和养猪者)行为选择机理的基础上,通过建立有限次重复动态博弈模型导出了双方行为选择的影响因素,然后从影响因素强弱程度的角度对定点屠宰、产销集团和公司 基地 养猪户等3种典型的猪肉生产组织模式进行了对比分析,结果表明:产销集团模式的猪肉质量最好,公司 基地 养猪户模式次之,定点屠宰模式最差。表2,参4。     

高职英语专业学生学习动机行为影响因素的路径模式

本文运用定量与定性研究相结合的方法，通过问卷调查、学习行为观察、自我陈述及对调查数据进行相关分析、路径分析等手段。对来自2所高职院校外语系709人中严格分层抽样出来的20名乐学学生、20名次厌学学生及20名厌学学生的学习动机行为影响因素进行数据分析。结果发现：1．三大类学生动机行为的预期因素都有动机水平、学习策略，且R^2达到0．768以上的水平。2．兰大类学生路径分析中都以学习策略对动机行为的回归效应为最大：厌学类W^2=0．583，次厌学类：R^2=0．850，乐学类：R^2=0．750。     

低密度聚乙烯结晶与熔化行为研究

作者用DSC法研究了LDPE的等温和非等温结晶动力学和熔化行为。LDPE的平衡熔点和晶片折迭表面自由能分别为111.7℃和1.33×10~(-11)J/m~2,有8％的长支链参与主链结晶。     

Mo3Si-Mo5Si3共晶硅化物的氧化

利用循环氧化和原位X射线衍射法，研究了Mo3Si-Mo5Si3共晶硅化物在600-1200℃氧化行为，分析了低温氧化规律和高温氧化瘟疫现象．结果表明，共晶硅化物的低温氧化并没有按照热力学优先顺序反应而是受到了动力学因素的控制，氧化曲线呈直线规律．在1000℃氧化并发生氧化瘟疫现象的试样中发现，孔洞和裂缝等缺陷处优先生成混合氧化物．这种混合氧化物的体积效应导致氧化瘟疫现象的发生．     

可微动力系统的渐近性研究及其在神经网络中的应用

可微动力系统是国内外学者广泛研究的问题有广泛的应用背景．特别是在人工神经网络领域中应用已成为国际学术热点．试图介绍可为动力系统与人工神经网络方面的最新研究成果．