Circadian rhythms and bright light: Recommendations for shift work

This paper starts with a brief review of the basic principles of human circadian rhythms relevant to understanding the problem of shift work. It then presents a more detailed critical review of the recent bright light literature, with an emphasis on methodological shortcomings, alternative interpretations, and areas that need further research. Evidence is presented which suggests that either a light-dark cycle (which includes bright light) or a sleep-wake schedule can act as a zeitgeber for human circadian rhythms. Current human phase response curves to bright light are reviewed. Light-work-sleep schedules are presented which have been designed to eliminate the physiologically based harmful consequences of shift work. These schedules include both bright light and sleep-wake schedule zeitgebers. Other practical applications of bright light treatment are mentioned.     

用低温显微DSC系统测定冻结食品的玻璃化转变温度

指出了现有的测量Ｔ＇ｇ方法中存在的问题，分析了低温显微ＤＳＣ（差示扫描量热法）系统测定Ｔ＇ｇ的原理，认为低温显微ＤＳＣ系统是一种能准确测量玻璃化转变温度Ｔ＇ｇ的新型仪器     

三火球模型中参数配分温度的计算

利用夸克-胶子等离子体模型的计算结果计算三火球模型中的参数配分温度,计算值和实验结果符合。     

钒钛湿度传感器的綫性化及溫度补偿

本文根据钒-钛陶瓷湿度传感器的湿度-阻抗特性,运用最小二乘法对其湿-阻特性进行了理论拟合,从而得到了湿-阻特性的解析式。并根据电路理论,提出了钒-钛陶瓷湿度传感器的线性化及其温度补偿方法。     

连续铸造灰铁管内沟形成机理的探讨

本文通过测量内结晶器的变形,研究了内沟与石墨化膨胀及内结晶器变形的关系,指出了产生内沟的原因及其位置,为减少内沟提供了一定根据。     

Nb_2O_5掺杂对MnCoNi系NTC热敏电阻材料的影响

采用Ｘ射线衍射分析、ＳＥＭ、阻值测量等手段，通过实验研究了Ｎｂ２Ｏ５掺杂对ＭｎＣｏＮｉ系ＮＴＣ热敏电阻材料的影响。以ＭｎＣｏＮｉ系为基，掺入适量的Ｎｂ２Ｏ５后，其阻温特性变化规律与传统Ｍｎ－ＣｏＮｉ系材料一致，同时室温阻值、Ｂ值略有增加，电学稳定性提高了两倍以上。     

废气调温煤气燃烧器压力-流量特性理论与实验研究——燃烧控制模型研究I

对废气调温煤气燃烧器进口压力与流量的对应关系进行了理论与实验研究，给出了进口压力ˉ流量的理论公式和经验公式．根据经验公式，可通过控制各进口压力实现流量的控制，为高温气体的流量调节提供了一种新方法．     

基片温度对非晶碳硅薄膜电导的影响

在基片加热的条件下,高纯硅靶在甲烷和氩的混合气氛中,采用直流平面磁控反应溅射,可以制备具有光电响应的氢化非晶碳硅合金薄膜。本文对不同基片温度下成膜的样品进行了电导性能测试并分析了测试结果,得出了基片温度是影响该薄膜光电导的关键因素的结论。     

The impact of park trees on microclimate in urban areas

Trees in cities have an important positive effect on people’s lives. One such positive effect is the amelioration of microclimate. The aim of this research is to assess the correlation between parameters that affect the microclimate of parks during the summer. We measured air temperature, relative humidity and solar radiation in the sun and shade of the trees in urban parks in Thessaloniki, Greece. The results indicate that: the air (A) temperature reduction percentage (dTair%), air relative humidity increase (dTRh%), discontent index reduction percentage (DI%) (cooling effect) and solar radiation (L) percentage that passes through the trees’ foliage to their shade creates an exponential function of dA% = a.e-bL. These functions are also applicable to the limiting variation values of the parameters. If we use L = 0 (meaning Lightsh = 0, which is the case for an extremely dense tree), then the values that we expect from this particular parameter are the maximum possible. These maximum values are a characteristic feature of the parameter variation for this particular research area. These maximum values for the trees in the parks of Thessaloniki are: maxdTair% ≈ 24%, maxdRh% ≈ 41% and maxdDI% ≈16%.     

高压高温染色机机头箱的有限元强度分析

参照JB4732—95钢制压力容器———分析设计标准,对机头箱进行了有限元强度分析.按照应力分类的原则,进行了应力分类评定和疲劳寿命校核.结果表明,机头箱满足强度要求.