数字计时器的逻辑设计

作者曾提出过电子数学计时器的一种逻辑设计方案。本文是对前述设计方案的改进与完善,使其在方法上更有系统,在电路上更为简单。     

用5G7556—CMOS双时基电路产生对称方波的研究

本文研究用5G7556-CMOS双时基电路产生对称方波的条件和实验调整方法.     

Long-term motor activity recording of dogs and the effect of sleep deprivation

Summary Motor activity of laboratory dogs was recorded for several weeks with an ambulatory monitoring device. The effect of 24 h sleep deprivation (SD) on motor activity during recovery was investigated. A clear rest-activity rhythm was established. The dogs exhibited a similar mean daily rest-activity pattern: 1) rest occurred mainly in the dark; 2) the amimals were most active after light onset; activity increased during the last two dark hours; 3) a rest period was found at noon and reduced activity during afternoon hours. There was a marked difference in total activity between individual dogs. Activity patterns varied as a function of the day of the week; this may have been a reflection of variations in the level of human activities in the laboratory. There was a significant reduction of motor activity during the 24-h period following SD. This was particularly evident in the first 6 h of the light period immediately following the deprivation.In addition, there was a significant increase in the number of episodes with activity 5 counts during recovery. The study confirms the possibility of measuring motor activity to assess compensatory mechanisms during recovery after SD. Sleep regulation, therefore, does not necessarily need to be exclusively examined by the invasive technique of EEG registration.     

一种可靠的看门狗电路

介绍一种实用的硬件复位电路,其成本低、性能可靠,且具有故障复位和上电复位作用.     

半导体（砷化镓）激光照射对犬创伤愈合及细胞免疫机能的影响

以犬为试验动物研究了半导体 (砷化镓 )激光照射创面对皮肤缺损创愈合以及血液中酯酶染色阳性淋巴细胞数的影响。结果表明 ,用波长 890nm ,平均功率 2mW ,峰值功率 5W的半导体激光照射创面可使边长 2cm的正方形犬皮肤全层缺损创平均提前 3.5 1d愈合 ,并使血液中酯酶染色阳性淋巴细胞数明显提高     

面向通信领域的定时器队列管理模型

在通信领域的软件设计中，定时器队列的合理组织与管理成为保证整个系统实时性与可靠性的重要因素．给出了三种定时器的组织与管理模型：简单时长有序单队列模型、多队列分拆模型和循环计时多列队模型，特别是后两种模型，通过在交换机的实际应用中的证明，确实能大大提高整个系统的性能．     

8253定时器/计数器在带钢剪切系统中的应用

介绍了一种利用可编程度时器／计数器8253测量切头和切尼长度的方法，该方法已经成功地应用于带钢轧制生产线的成品计重系统中。     

冯至与里尔克

本文以物为切入点,探讨德语现代作家里尔克在物与观看、物与经验,物与自我存在等方面对中国现代作家冯至的影响.文章认为,冯至对里尔克的接受经过了道家、佛禅思想的过滤并在二者之间游离.冯至没有走向超验的存在,而是着眼于对现实的承担与超越.     

未成年人在电影性爱场面观看中的角色分析

电影性爱场面的观看具有文化规则的复杂性，而未成年人会简化这些规则以掌握它们。对电影表现性爱的负面传播效果的顾虑，在很大程度上是针对他们而产生的。从现存的观看机制来看，未成年人在电影性爱场面观看中具有不协调的观众存在的矛盾与意义。     

企业战略反应系统的研究

对竞争环境中的企业提出了战略反应系统 ,分别从环境扫描、竞争对手监视、竞争对手情景分析和战略反应讨论了战略反应系统的实施和构成 .该系统指导企业面对环境和竞争对手变化的情况如何决定自己的战略 ,以应付将来的局势