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一、引言本文提供一种防碰激光警标系统,该系统能够有效地防止军用机、民用机、商用机、特别是有雷达和无雷达控制的一般航空机的碰撞。这种系统比现有的雷达系统灵敏得多,而且结构适宜,适于安装。装有该种系统的两机即使距离靠得很近,只要彼此没有碰撞危险,也就不会发出伪警。 相似文献
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Carbonate eolianites in Houshijing, Putian, Fujian, consist of three sand ridges. The geometry and sedimentary structures of these ridges are described here, and their paleodune types and the paleowind directions are reconstructed on the basis of discussion of genesis. The authors consider that they were vegetated longitudinal dunes or sand drifts and wind shadow dunes or sand shadows which were formed by reworking of adjacent beach sand by prevailing northeast monsoon during the latest Middle Holocene. The wind directions in the past and at present do not appear to have obviously changed. 相似文献
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In this paper, properties on pulsed radiation detections of ZnO:Ga crystal grew by a magnetron sputtering method were studied. The time response to pulsed laser, pulsed hard X rays and single α particles, the energy response to pulsed hard X ray, the scintillation efficiency to γ rays, the response to pulsed proton, and the relations of the light intensity varied with the proton energy were measured and analyzed in detail. Results show that the ZnO:Ga crystal has potential applications in the regime of pulse radiation detection. 相似文献
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利用P-2-Ni催化剂对巴豆醛常压催化加氢生成正丁醛的反应进行了研究。实验表明,该催化剂对巴豆醛的α,β-烯键有很高的选择性和催化活性,同时,合成了P-2-Co、P-2-Co-Ni催化剂,并选择了巴豆醛的加氢条件。 相似文献
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