电阻型高分子湿度传感器的湿敏特性公式的研究

测试了电阻型湿度敏感器随着温度变化的导电性能，根据Arrhenius关系和大量测试数据的分析，导出了该湿度传感器的电阻随着相对湿度变化的半经验公式，并通过实例应用了该半经验公式。     

内外条件对混凝土拉仲徐变的影响

由于进行混凝土拉伸试验很困难。所以当前对于混凝土拉伸徐变的研究较少．本文收集了有关的试验资料，分析了影响拉伸徐变的几个重要因素，其中包括掺舍料、水灰比、湿度交换、加荷龄期等．总结了拉伸徐变的变化规律，其目的是让人们进一步了解混凝土的拉伸徐变及它对混凝土结构产生的影响．     

Relative humidity as an environmental factor determining the microhabitat of the nymphs of the rice brown planthopper,Nilaparvata lugens (St?l) (Homoptera: Delphacidae)

Summary Microhabitat of the nymphs and the adults of the rice brown, planthopper,Nilaparvata lugens is known to be the lower parts of rice plants. In this study, possible environmental factors determining the range of the microhabitat were experimentally analyzed by using the nymphs under laboratory conditions. Thirty individuals of the 1st or the 3rd instar nymphs were released to a potted rice plant covered with a transparent acrylic cylinder. When the top of the cylinder was kept opening (open condition), the temperatures in the cylinder were almost constant, and relative humidities in the cylinder decreased with the increase of the height from the water surface of the pot. In the open condition, most nymphs and all exuviae were found on the basal parts of rice plants where the humidity was more than ca. 90% r.h. When the top of the cylinder was kept closing with parafilm (closed condition), the temperatures in the cylinder were almost constant, and relative humidities in the cylinder were more than 95% r.h. In the closed condition, the nymphs and the exuviae were distributed sparsely to the whole parts of rice plants. In both of the open and the closed conditions, patterns of nymphal distributions on rice plants during the dark regime were the same as those during the light regime under 25±2°C and 16L∶8D. Four different temperatures ranging from 20°C to 35°C did not influence on the microhabitat in the open condition. It was concluded from the results that relative humidity is the important environmental factor to determine the microhabitat of the nymphs ofN. lugens which showed to prefer very humid condition more than ca. 90% r.h.     

基于DHT11的无线温湿度传感器网络节点的设计

基于温室和养殖孵化等场所需要及时监测环境温湿度的需求,设计了一种低成本、低功耗的无线温湿度传感器网络节点。主要介绍了节点的软硬件设计,详细阐述了DHT11温湿度传感器的时序。传感器节点的设计以超低功耗MSP430F122单片机为核心,配以DHT11和无线RF收发芯片NRF401实现了节点有效的数据采集和可靠的数据传输。节点具有功耗低、成本低、体积小、集成度高、工作稳定等优点。     

从安装调试看影响流化床制粒的因素

对上海美优制药有限公司引进的流化制粒包衣机进行再设计、安装和调试.通过对风系统设计、热源选择、温湿度控制等方面的分析表明,流化风量、孔板开孔率和温湿度对包衣效果有着重要的影响,甚至决定包衣过程能否进行.     

智能孵化控制系统的设计与实现

针对禽蛋孵化过程中的控制问题,研制了一种以8051单片机为核心新的孵化控制系统,采用不同控制方法,对温度、湿度和氧气浓度进行控制,并用间接模糊解耦方法对温度、湿度和氧气浓度三者进行解耦,着重阐述了软件设计思想,并给出了控制算法。系统的实际运行结果表明,该系统动态响应好,控制精度高,并易于各种孵化曲线的实现。     

螺栓扭矩系数影响因素的研究及应用

阐述了螺栓扭矩系数的概念,综述了扭矩系数影响因素的实验研究及应用。指出螺纹表面及支撑面的摩擦系数决定着扭矩系数的大小。开展扭矩系数影响因素的研究,其目的在于设法降低扭矩系数值并提高其稳定性。对于重大的户外高强度螺栓连接结构,应该重视环境温度和湿度因素对扭矩系数的影响。     

冰箱试验室的温湿度模糊控制系统应用研究

介绍了模糊控制技术在冰箱试验室的温湿度控制中的应用。实验表明在冰箱试验室对温湿度进行模糊控制，对提高工况的稳定性和控制精度、缩短工况稳定时间是一种行之有效的方法。     

Humid microenvironment prerequisite for the survival and growth of nymphs of the rice brown planthopper,Nilaparvata lugens (St?l) (Homoptera: Delphacidae)

Nymphs ofNilaparvata lugens were experimentally reared from the 2nd instar in a cage covering part of the leaf sheath of an individual rice plant grown in a Wagner pot. Plants were covered with the cage from the water surface of the pot to 10 cm above the surface (lower cage-group) or from 10 cm to 20 cm above the surface (upper cage-group). Temperatures measured at three different parts of the cage remained fairly constant in both groups at around 25°C (23.7–25.2°C in mean value). In the lower cage-group, relative humidities measured at the three heights in the cage in (76.3–90.5% in mean value) markedly increased with the approach to the water surface. The nymphs of this group, particularly during the molting period, aggregated close to the surface. Eighty-two percent of the released nymphs emerged in this group. Relative humidities measured at three heights of the upper cage-group were 69.5–72.7% in mean value, and all the nymphs in this group died within 3 days after their release although half of them stayed on the rice plants within 6 h after their release. The role of relative humidity as a limiting factor on the range of the microhabitat and the population density ofN. lugens in rice fields was discussed on the basis of the results.     

Effects of air pollution and weather on the initial COVID-19 outbreaks in United States,Italy, Spain,and China: A comparative study

Contrasting effects have been identified in association of weather (temperature and humidity) and pollutant gases with COVID-19 infection, which could be derived from the influence of lockdowns and season change. The influence of pollutant gases and climate during the initial phases of the pandemic, before the closures and the change of season in the northern hemisphere, is unknown. Here, we used a spatial-temporal Bayesian zero-inflated-Poisson model to test for short-term associations of weather and pollutant gases with the relative risk of COVID-19 disease in China (first outbreak) and the countries with more cases during the initial pandemic (the United States, Spain and Italy), considering also the effects of season and lockdown. We found contrasting association between pollutant gases and COVID-19 risk in the United States, Italy, and Spain, while in China it was negatively associated (except for SO₂). COVID-19 risk was positively associated with specific humidity in all countries, while temperature presented a negative effect. Our findings showed that short-term associations of air pollutants with COVID-19 infection vary strongly between countries, while generalized effects of temperature (negative) and humidity (positive) with COVID-19 was found. Our results show novel information about the influence of pollution and weather on the initial outbreaks, which contribute to unravel the mechanisms during the beginning of the pandemic.