Effect of modulated microwave radiation on human EEG asymmetry

This study is aimed to investigation of the effect of modulated 450 MHz microwave radiation on the EEG inter-hemispheric asymmetry. Ten cycles of the microwave exposure (1 min off and 1 min on) at fixed modulation frequency were applied on two groups of healthy volunteers. The first group of 13 subjects was exposed to microwave radiation modulated at 14 Hz and the second group of 15 subjects at 40 Hz frequency. The peak specific absorption rate (SAR) average over 1 g was 0.303 W/kg. Differences in SAR between hemispheres were up to 20 dB. Rod antenna was located from the left side of the head. Differences of relative changes in EEG energy between symmetric channels FP1–FP2, T3–T4, P3–P4 and O1–O2 in exposed and sham conditions were analysed. The results showed increase in EEG energy from the left side caused by microwave exposure. Statistical analysis done for the whole group of subjects didn’t reveal significant differences in inter-hemispheres asymmetry between exposed and sham conditions. However, statistical analysis performed for individual subjects detected significant differences in asymmetry caused by exposure for 15–35% of individuals.     

多相光催化反应器辐射能模型的建立与验证

采用双通量模型模拟了管式三相流化床光催化反应器中辐射能分布和局部体积能量吸收速率,并采用负载型TiO2/SiO2光催化剂进行了实验验证,考察了液相介质、通气量及催化剂浓度对光辐射强度和体积能量吸收速率的影响.实验结果表明,实验数据和模型计算值能够较好吻合,蒸馏水做液相介质时,可将气液鼓泡流看成单一的连续相,催化剂浓度越...     

基于开源GIS的长江流域晴日辐射反演

以开源GIS软件GRASS为平台,首次通过辐射过程模型r.sun和编程语言Shell实现长江流域500 m分辨率的晴日辐射反演（包括直接辐射、散射辐射和反射辐射）,为了解长江流域辐射时空分布规律和相关宏观气候、生态建模奠定基础。结论如下：（1）精度验证表明,晴日辐射反演结果较理想;相关晴日指数的误差指标MPE、MAPE和RMSE分别为37%、75%和64%,r.sun模型可进一步用于中国其它区域;（2）长江流域晴日辐射年均日值为2424±245 MJ/(m2·d),其各组分差异显著,直接、散射、反射辐射分别占总辐射的842%、156%和02%;（3）晴日辐射空间分布梯度明显,沿三级地形阶梯向东辐射值及变异逐渐减小,海拔变化引起的大气衰减因素在决定晴日辐射分布时起重要作用;（4）晴日辐射季节分布不对称,月际变化总体呈倒“U”形分布;直接辐射和散射辐射变化趋势基本一致,但二者比例随大气浑浊度的变化波动剧烈。     

Cell size dependence of additive versus synergetic effects of UV radiation and PAHs on oceanic phytoplankton

Polycyclic Aromatic Hydrocarbons’ (PAHs) toxicity is enhanced by the presence of ultraviolet radiation (UVR), which levels have arisen due to the thinning of the ozone layer. In this study, PAHs’ phototoxicity for natural marine phytoplankton was tested. Different concentrations of a mixture of 16 PAHs were added to natural phytoplankton communities from the Mediterranean Sea, Atlantic, Arctic and Southern Oceans and exposed to natural sunlight received in situ, including treatments where the UVR bands were removed. PAHs’ toxicity was observed for all the phytoplankton groups studied in all the waters and treatments tested, but only for the pico-sized group a synergetic effect of the mixture and UVR was observed (p = 0.009). When comparing phototoxicity in phytoplankton from oligotrophic and eutrophic waters, synergy was only observed at the oligotrophic communities (p = 0.02) where pico-sized phytoplankton dominated. The degree of sensitivity was related to the trophic degree, decreasing as Chlorophyll a concentration increased.     

Data driven modelling of vertical atmospheric radiation

In the Czech Hydrometeorological Institute (CHMI) there exists a unique set of meteorological measurements consisting of the values of vertical atmospheric levels of beta and gamma radiation. In this paper a stochastic data-driven model based on nonlinear regression and on nonhomogeneous Poisson process is suggested. In the first part of the paper, growth curves were used to establish an appropriate nonlinear regression model. For comparison we considered a nonhomogeneous Poisson process with its intensity based on growth curves. In the second part both approaches were applied to the real data and compared. Computational aspects are briefly discussed as well. The primary goal of this paper is to present an improved understanding of the distribution of environmental radiation as obtained from the measurements of the vertical radioactivity profiles by the radioactivity sonde system.     

增强的UV—B辐射对黄瓜（Cucumis sativus）不同叶位叶片生长、光合作用和呼吸作用的影响

在植物生长室中,黄瓜植株第1片真叶出现后,用人工UV－B光源照射60d,测定植物各叶位叶片的生长和生理活动。结果表明,UV－B辐射条件下,植物出叶时间被延迟,叶面积和叶干重下降,降幅与叶位高低正相关;叶片含水量降低,老龄叶片（1叶,下位叶）和幼龄叶片（第5叶,上位叶）的水分降幅均高于成年叶片（第3叶,中位叶）;叶片的伸展速度,叶片数目以及单叶面积减少,致使黄瓜总叶面积下降;植株节间长度缩短,是植株矮化的重要原因;根、茎、叶等器官之间的相关生长变化不大,叶片生长在其中起重要的协调作用。UV－B降低Pn和EAQE,对光合的抑制程度随叶位升高而增加,UV－B辐射后,黄瓜叶片的光呼吸显著提高,增幅与叶片发育阶段有关,UV－B对黄瓜第1叶的暗呼吸没有影响,第2、3叶略微下降,第4叶显著升高,分析认为,植株矮化叶面积减少有利于植物适应UV－B辐射;水分含量和光合作用减少、呼吸作用增强是黄瓜生长受抑制的生理基础。图2表2参18     

Microwave-induced combustion of volatile organic compounds in an industrial flue gas over the magnetite fixed-bed

A modified domestic microwave oven was applied to heat a magnetite (Fe₃O₄) fixed-bed for continuous decomposition of volatile organic compounds (VOCs), such as acetone, n-hexane, and dichloromethane (DCM), in a simulated flue gas which contains VOCs equivalent to 2000 ppmv as DCM. Experimental results revealed that effect of the addition of water to the inlet stream on decomposition of DCM in the overall experiment was insignificant. Bulk temperature of the Fe₃O₄ fixed-bed was also found to reach 600 °C from an initial room temperature by 6.5 min under microwave radiation, even though the inlet gas was at a high gas hourly space velocity of 5240 h⁻¹ and a high relative humidity of 75%. Moreover, the VOCs in the inlet stream could be decomposed completely over the Fe₃O₄ fixed-bed by microwave heating at a power level of 645 W at heating time of 10 min. The conversion of VOCs is stable when the Fe₃O₄ fixed-bed has been heated longer than 10 min with microwave radiation. The microwave-induced heating upon Fe₃O₄ fixed-bed processing appears to be not only an energy efficient technique for air pollutions treatment but also a promising technology for variety of VOCs in a flue gas from industrial factory being decomposed simultaneously and completely.     

城市公共绿地应急避险功能中的人口服务辐射能力的研究——以北京市为例

为推动城市公共绿地应急避险体系建设的发展,根据概括的应急避险功能评价指标体系要求,通过人口密度分布与公共绿地缓冲区的叠加分析,对城市公共绿地的人口服务辐射能力进行了深入研究。结果显示,整个北京规划市区内公共绿地的缓冲区覆盖范围总计为421.96 km2,约占规划市区面积的38%,还存在626.46 km2的服务盲区,盲区所涉及的户籍人口为254.8万。另外,东城区所属的东四、朝阳门和东直门街道办事处,以及宣武区所属的椿树街道办事处所含的公共绿地缓冲区占其行政区面积的比例仅分别为0.04%、21.22%、23.45%、25.61%,存在较大的服务盲区,人口服务辐射能力有待加强。     

空间紫外辐射高加速地面模拟技术

目的 实现空间紫外辐射地面高加速模拟.方法 分别利用氙灯和氘灯作为近紫外和远紫外的模拟源,利用反射滤光技术实现对可见红外波段光谱的过滤,利用准直和发散技术实现不同的辐照面积,利用热沉和浴油温控实现温度控制,搭建光学性能原位测试系统,对辐照腔和试验腔进行分离设计.结果 实现了φ300 mm面积上1～15 SC和φ180 ...     

古商业街木结构建筑防火间距的数值模拟研究

古商业街木结构建筑较多,防火间距先天不足,发生火灾后蔓延迅速,有必要开展木结构建筑引燃特性研究以获得合理的防火间距设置参数.以古商业街为研究对象,以临界温度和热辐射强度作为着火建筑对面木结构建筑被引燃的判定指标,综合考虑环境风速、建筑间距、火源功率、喷淋系统等因素,运用火灾动力学模拟软件FDS分析系列火灾场景下的温度和...