Observation bio-effect of SW-global solar radiation in Ilorin in the tropics

The annual variation of global (total) solar radiation measured over four (4) years (1995–1998) at Ilorin (8°32′N, 4°34′E) was studied and the bio-effects of the variation is herein reported. The weekly averages of the solar radiation flux were obtained and plotted. The profile of the weekly averages of the insolation shows two notable “wells” corresponding to the harmattan dry season and the rainy season. It was deduced that the duration of the seasons was directly proportional to the sizes of the “wells”, while the depths of the “wells” correspond to the severity of the causes of the “wells”. The fall and rise rates of the depth of the edges of the wells are inversely proportional to the ecological effects of the variation of the radiation. The rates of decrease and increase of the radiation flux affect the depths of the “wells” and were found to be rapid and shallow for the “Harmattan Well”, and gentle and deep for the “Rain Well”. The width (duration), rate of change and depth of the “Harmattan Well” bring about stress for both animals and plants.     

Comparison of ANN and MLR models for estimating solar radiation in Turkey using NOAA/AVHRR data

In this paper, the estimation capacities of MLR and ANN are investigated to estimate monthly-average daily SR over Turkey. The satellite data are used for 73 different locations over Turkey. Land surface temperature, altitude, latitude, longitude and month are offered as the input variables for modeling ANN and MLR to get SR. Estimations of SR are evaluated with the meteorological values by using the statistical bases. The obtained results indicated that the ANN model could achieve a satisfactory performance when compared to the MLR model. Moreover, it is understood that more accurate results in estimation of SR are obtained in the use of satellite data, rather than the use of meteorological station data. Finally, the built ANN model is used to estimate the yearly average of daily SR over Turkey. As a result, satellite-based SR map for Turkey is generated.     

气体辐射与流场耦合对火星进入热环境影响

采用火星大气物理化学模型,求解带辐射源项的三维热化学非平衡N S方程,对探路者号火星探测器进入过程中的高温流场和热环境进行了数值模拟,分析了气体辐射与非平衡流场耦合效应对流场和热流的影响。结果表明：1)探路者号火星探测器流场热化学非平衡效应显著,CO 2 气体发生大规模离解,高度低至 28.5 km 仍存在热力学非平衡效应;2)热力学与化学非平衡效应的影响均与表面催化特性相关,完全催化热流要高于完全非催化热流50%以上;3)高温流场中的CO组分会产生较强的气体辐射加热,辐射热流与对流热流的比值为15%～45%,靠近肩部区域比值最大;4)气体辐射对非平衡流场的冷却效应使激波脱体距离减小;与非耦合方法相比,采用耦合方法得到的辐射热流降低约12%～25%。     

某相控雷达内部环境温度预估

应用离散结构三维温度场分析程序 ,将固体、流体表面的对流作为接触问题处理 ,并把太阳辐射作为外部热流数据、内部电子作为内部热源 ,计算了某相控雷达的温度分布。     

反辐射导弹导引头多目标分辨方案研究

提出被动微波导引头多目标鉴别电路和战时电子支援系统一体化设计的设想，贯彻“面载复杂、弹载从简”的原则，使被动微波反辐射导弹导引头信号分选和目标识别电路力求简单。     

用热像仪测试发动机燃气流场温度

通过试验研究，利用红外热像仪测试固体火箭发动机燃气流场的辐射温度，并通过高温风洞的标定数据，对测试结果进行了分析处理。提出了解决发动机燃气流场红外辐射测温时辐射系数设置的方法。     

加装红外抑制器的直升机红外辐射的计算及测量

计算了光谱在3～5 μm及8～12 μm范围内,加装与机身结构一体化红外抑制器的某型直升机排气系统的红外辐射特性.计算中考虑了排气系统部分蒙皮的红外辐射、双喷管发动机喷气流的红外辐射、背景辐射及大气的吸收衰减对直升机排气系统红外辐射信号的影响.实验发现,一架加装与机身结构一体化红外抑制器的直升机排气系统红外辐射特性的计算结果,与实测结果基本一致.     

Radiative properties of pulsar magnetospheres

We discuss recent results of radius to frequency mapping of pulsars. This method shows that for 43 pulsars the radio emission originates near the polar cap for millisecond pulsars and a few hundred km away for longer period pulsars. If the magnetospheres of these object contain dipolar magnetic fields, the corresponding magnetic field strength in the emission region is about 10⁷ gauss, for all pulsars in the sample. We investigate possible physical reasons for the location of the radio emission.     

Radio Diagnostics of the Solar Flare Reconnection

First, high-frequency (HF) slowly drifting pulsating structures are interpreted as radio emissions of electron beams accelerated in the magnetic reconnection volume and injected into magnetic islands (plasmoids). Then, the time evolution of plasma parameters (density, magnetic field, etc.) in a 2-D MHD model of solar flare reconnection is computed numerically. Assuming plasma radio emission from locations where the “double-resonance’’ instability generates upper-hybrid (UH) waves due to unstable distribution function of suprathermal electrons, the radio spectra and spatial source structures in the reconnection region are modeled. By comparison of the modeled and observed spectra a remarkable similarity has been found between the computed narrow-band emission and the observed lace bursts. Finally, a new diagnostics of the reconnection process is proposed.     

辐射测温中环境辐射的影响

在辐射测温中，环境辐射对辐射测温有一定的影响。对于环境辐射的影响，不少参考资料中指出500℃以上可以忽略，经理论分析得出，是否考虑环境辐射的影响，不仅与所测温度有关，同时与辐射温度计的工作波长和所测物体的发射率有关。为了提高测温的准确性，分别对单色、比色测温中环境辐射的影响进行了分析比较。