Interaction between the effects of centrally administered arecoline and leucocyte pyrogen on the activity of posterior hypothalamic neurons in the rabbit

Summary In experiments with urethane-anesthetized rabbits, the alteration in the activity of posterior hypothalamic neurons resulting from intracerebroventricular injection of leucocyte pyrogen was attentuated by subsequent administration of arecoline. Atropine failed to alter the neuronal response to leucocyte pyrogen but abolished the effect of arecoline. The neuronal response to arecoline was reversed in the absence of leucocyte pyrogen.     

Both thermal and nociceptive afferents influence the unit activity of the neurons in the corpus striatum

Summary Both thermal and nociceptive stimulation in the periphery were shown to influence the neuronal activity recorded in the striatal area. Both the thermal and nociceptive sensitivity of the striatal neurons were closely related.The authors are grateful to the Alexander von Humboldt-Stiftung (Bad Godesberg, Bonn, Federal Republic of Germany) for donations of the necessary equipment for the present study. The research reported here was supported by grants from the National Science Council (Taipei, Taiwan, Republic of China)     

部分修复时间可忽略的系统瞬时可用度模型

针对马尔可夫的单部件可修系统的不足,假设部件寿命和故障修复时间都遵从一般分布,对非马尔可夫的单部件可修系统的可用状态进行了定义,将临界修复时间分为正常数和非负随机变量两类进行分析,得出了新模型的系统瞬时可用度,从而更加准确地反映了该类系统的效能。最后,通过一组数值试验对新模型和原系统的瞬时可用度进行了比较。结果表明,得到的新模型能更准确地刻画系统的可用情况。