放射性表面污染测定应注意的几个问题

对放射性表面污染如何准确测量的细节问题进行了较详尽的阐述。     

The effect of elevated UV-B (280–320 nm) radiation levels on Silene vulgaris: A comparison between a highland and a lowland population

Highland (altitude 1600 m above sea level) and lowland (altitude −2 m below sea level) populations of the perennial herb Silene vulgaris (Moench) Garcke, were tested on their response to elevated levels of UV-B radiation. Highland populations typically receive high natural UV-B fluxes, whereas lowland populations receive a lower natural UV-B dose. Adaptation to high UV-B levels of the highland population is to be expected. Experimental comparison of growth rates, gas exchange rates, transpiration and biochemical parameters using adult plants as well as seedlings did not show a difference in the response to elevated UV-B levels between the two populations. Individuals of both populations were relatively insensitive to elevated UV-B radiation. The response of alpine and lowland populations of Silene vulgaris is discussed in relation to the dispersal of this species after the last ice age.     

人工电磁辐射源固有危险性指数法评价研究

在总结现有安全评价方法基础上,结合电磁辐射中对污染危害有影响的因素建立了电磁辐射源固有危险性评价的指数法评判模型.在该模型里,就电磁辐射源固有危险性评判的评价指标与等级选取、评价指标标准以及权重确定等进行了研究.     

手机电磁辐射安全评价

综述了手机辐射的原理、辐射危害、辐射场计算和辐射评价技术标准及其检测仪器,并提出了一些减小手机辐射的措施和建议.     

电磁环境污染特点与管理对策

阐述了电磁环境污染的特点及其危害,介绍了我国电磁环境保护标准并与国际非电离辐射防护委员会(ICNIRP)推荐标准进行了比较,提出我国在电磁辐射污染的管理和政策制定中应当考虑的原则.     

哈尔滨市区雾的特征分析及预报指标研究

利用哈尔滨市1954-2003年天气现象地面观测资料中雾的记录,分析了哈尔滨市区雾发生的年际、月际和日变化规律,总结出了雾发生的气象要素、天气分型和预报指标.     

Effect of Additives on the Improvement of Mechanical and Degradable Properties of Photografted Jute Yarn with Acrylamide

The jute yarn was grafted with acrylamide monomer (AA) under ultraviolet (UV) radiation to modify its mechanical and degradable properties. A number of AA solutions of different concentrations in methanol (MeOH) along with photoinitiator Irgacure 907 [2-methyl-1-(4-methylthiophenyl)-2-morpholinopropanone-1] were prepared. The monomer concentration and irradiation time were optimized. Jute yarn grafted with 30% AA under UV radiation for 60 min showed of the highest polymer loading (PL) value of 22% with a enhanced tensile strength (TS) value of 195% and elongation at break (Eb) value of 256% compared to untreated jute yarn. To further improve the properties of jute yarn, a number of additives (1%) such as urea, polyvinylpyrrolidone, urethane acrylate, and urethane diacrylate were used in the AA (30%) solution. Among all the additives used, urea significantly influenced the PL (27%), TS (230%), and Eb (264%) values of the treated jute yarns. Water uptake and the degradation properties of treated and untreated jute yarn caused by simulated weathering and in soil (25% water) were also studied. The rate of degradation of grafted sample is lower then that of untreated sample. DSC studies showed the thermal stability of the AA plus urea grafted sample.     

池火特性参数计算及其热辐射危害评价

可燃性油品池火的火焰及其产生的热辐射 ,可能导致周围人员伤亡或设备设施损坏。笔者介绍了油品池火的质量燃烧速率、火焰长度、火焰倾角及火焰后拖量等特性参数的计算方法 ,提出了池火热辐射强度的预测模型 ,给出了热辐射伤害 /破坏准则 ,并进行了模拟计算和评价。     

煤与瓦斯突出预测技术研究现状及发展趋势

对矿井煤与瓦斯突出预测方法的研究现状及发展趋势进行了论述及分析。目前我国大量使用的是钻屑量S、钻孔瓦斯涌出初速度q、瓦斯解吸指标Δh2 、瓦斯放散指数ΔP等钻孔静态预测方法 ,这些方法花费大量的人力、物力和财力 ,而且准确性较低。而声发射和电磁辐射等方法是很有前途的预测方法。未来煤与瓦斯突出预测的发展趋势是 ,利用声发射监测技术对变形破裂剧烈区域进行定位 ,利用电磁辐射监测技术工作面非接触连续预测 ,再结合现有的环境监测系统监测的瓦斯动态涌出对煤与瓦斯突出现象进行准确预测     

温湿度和光强对水泥基材料负载纳米TiO2光催化氧化氮氧化物的影响

研究了路面水泥基材料负载纳米TiO2光催化氧化汽车尾气中氮氧化物过程中湿度、温度和光强对催化反应的影响．试验和分析结果表明，光催化氧化效率随湿度增加而急剧下降；当NO2浓度较低时，光辐照强度对光催化氧化效率的影响不显；NO2浓度较高时，随着光辐照强度的增强，光催化氧化效率呈现出上升趋势，在太阳光的照射下或在室内较弱紫外光照射下都具有良好的光催化氧化作用．在0～25℃的温度范围内，光催化氧化效率随温度升高而提高，而在25～60℃范围内温度的影响并不显。