中国数学史断代研究的一项新成果：—《明清数学史论文集》简介

本文简介梅荣照主编的《明清数学史论文集》一书，对中国数学史开展断代专题研究，是我国数学史界继承并发展李俨、钱宝琮、严郭杰先生研究成果的宏大计划，持续近三十年，历来为国际科学史界所重视，文集收入论文15篇、附录2篇，其中严敦杰先生遗作7篇，本文对15篇论文逐一作了简介。     

音视频节目的数字存储与管理

随着制作、复制、保存、查找的音视频节目资料越来越多，各种节目之间的交换成为一种必要的手段，而数字存储技术与数字化管理系统是解决音视频节目资源存储、交换、管理的最佳途径。针对传统音视频媒体存在的缺陷，提高音视频节目的数字存储的原则和方法，指出了如何构建音视频节目数字化管理系统的途径。     

现代科学思想方法研究的原则和方法

本文根据现代科学思想方法的整体结构特点和形成规律,提出了研究现代科学思想方法应遵循的一般原则,介绍了现代科学思想方法研究常用的几种方法。     

Axillary 5α-androst-16-en-3-one in men and women: Relationships with olfactory acuity to odorous 16-androstenes

Summary Axillary 5-androst-16-en-3-one (5-androstenone) levels were found to be significantly higher in men than in women but do not vary between left and right axillae, are not related to age, handedness or degree of hirsutism (in women) nor to anosmia to this steroid. In men (but not in women), levels are related linearly to axillary cholesterol concentrations but not to squalene. Olfactory thresholds for 5-androstenone varied widely, the lowest recorded being 0.2 ppb, but there was no difference in thresholds between men and women. Women (70%) found the smell repellant but anosmia did not differ greatly between men and women (9–20%). Anosmia to the smell of 5-androst-16-en-3-ol was most marked in women (90%) rather than in men (45%). Axillary 5-androstenone values were generally consistent with the musky or strong smells of male axillary extracts, compared with the sweet smell of those from female subjects.Supported by the Herbert Dunhill Trust.     

热力站自控系统被控参数的选择

在集中供热的自动控制系统中，被控参数选取供田水平均温度最为合理。因为，当热负荷随室外温度变化时，只有调节热网的供回水平均温度，才能保证系统的供热量，保证用户的室内温度，达到供热系统可靠运行、充分节能的目的。     

Fluid secretion by isolated cockroach salivary glands

Summary An isolated preparation of the innervated cockroach salivary gland has been developed to study secretion. This gland secretes a fluid rich in Na and Cl in response to nerve stimulation or bath application of dopamine.Acknowledgments. We are indebted to the Science Research Council for financial support.     

Intracellular recording of secretory potentials in a "mixed" salivary gland.

Secretory potentials evoked by nerve stimulation have been recorded from both types of cell (peripheral and central) present in the acini of cockroach salivary glands.     

无线遥测电子吊秤的系统设计

介绍了利用单片微机对无线遥测电子吊秤中称质量传感器的微伏信号进行自动测量、信号编码、无线遥测发射接收、信号实时处理、显示、打印等处理方法。采用无线传送称质量数据,使称质量物体操作更加简捷方便;在电路设计中,采用PPCM体制,使发射、接收功率大为降低,耗电非常之小;采用二次编码、解码技术发送接收,抗干扰能力显著提高;并且硬件电路软件,使硬件电路简单,性能价格比高。     

史载最早地震的时间地点探讨

本文根据若干有关先秦文献、史前考古成果以及现代地震学和动物学知识,严密论证《墨子·非攻下》篇所载世界最早地震发生的地点和时间的大致范围,并对其征兆作了诠释。