机载宽带雷达的数据重组空时自适应处理方法

机载宽带雷达具有更高的距离分辨率,有利于目标成像或识别。但是,提高分辨率也使目标信号和杂波信号在脉冲间和(或)阵元间距离走动量增加。若采用窄带空时自适应处理方法,则会导致输出信杂噪比严重下降。针对上述问题,提出了一种数据重组空时自适应处理方法。首先,针对待检测速度-角度重组回波数据,使不同脉冲及阵元的目标信号包络对齐;然后,进行距离维数据重组空时处理,并将输出信号作为检验统计量;最后,给出目标角度和速度搜索方法。所提方法降低了相干积累后的目标能量损失,提高了目标检测和杂波抑制性能。仿真实验验证了所提方法的有效性。

自噬在光疗治疗真菌性皮肤病中的研究进展

自噬被认为是机体的一种自我调节机制,对细胞和组织的动态平衡起着至关重要的作用。而真菌性皮肤病目前仍是当代社会备受关注的皮肤病之一。随着各种医学激光治疗的广泛应用,考虑到它全身副作用较小,便于使用,在治疗真菌感染性皮肤病方面的治疗中日益受到关注。现围绕自噬在光疗治疗各种真菌感染性皮肤病中的作用的相关研究展开综述。

Experimental investigation on operating instability of a dual compensation chamber loop heat pipe

The operating instability of a dual compensation chamber loop heat pipe (DCC-LHP) including temperature hysteresis, reverse flow and temperature oscillation is described and explained in this paper. Test results indicate that the steady state operating temperature under the variable conductance mode is not the same during the power cycle tests with the same heat load, and it is lower during the power reduction cycle than that during the power increase cycle. Orientation has an effect on the heat load range when temperature hysteresis occurs, and the effect of power variation amplitude can be ignored. Reverse flow tends to occur in some of the startups at low heat loads, even if vapor existed in the vapor grooves initially, which is caused by a higher pressure inside the wick due to evaporation in the evaporator core or vapor penetration into it. Temperature oscillation tends to occur in some of the startups at low head loads or some steady-state operations at high heat loads. Especially when the compensation chamber with the bayonet through is above the evaporator, the incidence rate of temperature oscillation is high.