多势垒结构中的共振能量和量子能级的差异分析

利用Ｃｈｅｂｙｓｈｅｖ多项式和传输矩阵方法解析推导出多量子阱（ＭＱＷ）系统的束缚电子级公式，并定量分析了多势垒结构中的共振能量和相应ＭＱＷ系统量子能级的差异。     

成本性态法在分析可比产品成本降低计划完成情况中的应用

本文根据成本性态法的思路．分析了影响可比产品成本降低额和降低率变动的因素，重点从理论上论证了产品品种结构的影响，并且合理地把单纯产量和品种结构对可比产品成本降低额（率）的影响分离开来．     

智能化44点啤酒发酵温度巡测仪

本文将八十年代最新研制的集成温度传感器ＡＤ５９０、８０９０单片机，可编程逻辑器件ＧＡＬ－１６Ｖ８Ａ等新器件及智能化新技术，集中应用于啤酒发酵过程的温度检测。与传统人工测温相比，具有测温精度高、稳定性好、反应快、可远距离自动检测、定时打印，减轻工人劳动强度、调节啤酒发酵温度的响应速度快等特点。     

我国工业重大灾害的Delphi预测方法及其应用──重大危险源辨识的德尔菲（Delphi）专家系统设计

文章针对我国工业企业重大灾害频繁发生的现实，运用Ｄｅｌｐｈｉ方法对人－机－环境系统中大量无法定量的危险源作出概率估算和危险度分级，为建立重大危险源辨识的定量与定性分析相结合的专家系统等做一些初步探讨。     

New window on Proterozoic life

This article briefly discusses the the new fossil assemblage found in the 600-650-million-year-old shales of the Pertatataka formation in central Australia. It includes about two dozen taxa of spinose, process-bearing or otherwise ornamented acritarchs, many of them extremely large relative to comparably ornamented fossils in younger rocks. These acritarchs reveal a glimpse of early evolution and Proterozoic life.     

轮式分页输纸中的摩擦问题

本文着重研究了输纸轮与纸面间以及纸与纸间的静、动摩擦特性。分析了分页输纸的力学条件,并通过各种结构输纸胶轮和国产纸张的实验证明了正压力与摩擦系数之间存在着非线性关系。得出了一系列曲线。指出:利用非线性摩擦特性是分页输纸的理论基础,为设计简单的张簧式给纸盒提供了科学依据。经“OA”设备的OCR和OMR使用证明分页输纸稳定可靠。     

Antidiuretic effects of oxytocin in the Brattleboro rat

Summary The antidiuretic activity of oxytocin (OT) was measured in Brattleboro rats with congenital diabetes insipidus. A dose dependent antidiuretic response was found in animals receiving chronic infusions of 0.1 g/h, 1.0 g/h, and 5 g/h of OT. OT infused at the rate of 5 g/h over a 7-day period completely reversed the symptoms of diabetes insipidus. The results support the concept that OT serves as a weak agonist of vasopressin at the level of the kidney and at pharmacological levels exhibits antidiuretic activity.     

AnAnolis skin melanophore assay suitable for photoaffinity labeling studies with α-MSH

Summary Visual determination of MSH-induced pigment migration in melanophores of small pieces ofAnolis carolinensis skin is standardized by first measuring photoelectrometrically the change in reflection/transmission of the whole dorsal skin in response to different hormone concentrations. This method allows the rapid and precise recording of time-response curves after photoaffinity labeling of MSH receptors or of dose-response curves of large series of synthetic compounds.Acknowledgments. We wish to thank Ms V. Jäggin, Ms C. Schulthess and Ms G. van Hees for excellent technical assistance, Dr. R. Andreatta, Ciba-Geigy AG, Basel, for his generous gift of -MSH and Prof. A Pletscher for his continuous interest. This work was supported by the Swiss National Science Foundation.     

Bicuculline and picrotoxin block γ-aminobutryic acid-gated Cl− conductance by different mechanisms

Summary Using isolated, internally perfused bullfrog dorsal root ganglion cells we have studied the dose-response curves for -aminobutyric acid (GABA) in the presence of internally or externally applied GABA antagonists. With external application of antagonists the inhibition of the GABA current by bicuculline was competitive and that by picrotoxin was noncompetitive. Picrotoxin but not bicuculline blocked when internally perfused.To whom reprint requests should be addressed.Acknowledgments. We thank Drs S. Minakami and S. Yasui for helpful discussions and comments.