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抗电磁干扰失效产生的危害有时是直接的,有时是间接的.本文从对某新型雷达主体分机电磁兼容试验出现失效和液压系统分机传感器自兼容差导致失效所进行的分析,提出了抗电磁干扰失效的故障定位方法和二次(反)设计方法,可作为强化雷达电磁兼容设计和电磁兼容失效质量控制的参考试验依据. 相似文献
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本文提出了一种相控阵雷达天线谐波辐射发射改进型现场测试方法,并以某型雷达相控阵天线为例,基于ITU-R SM.329-11-2011和MIL-STD-461G-2015标准,构建了相控阵雷达天线谐波测试系统,在开阔场条件下,实测了天线的谐波辐射发射指标。研究结果表明:10 kHz_~40 GHz频段内,该型相控阵雷达天线的谐波辐射发射的二次谐波抑制度约为65 dB,三次及高次谐波抑制度为80 dB。侧面验证了改进型现场测试方法在雷达天线有效辐射功率测定,分辨率带宽设置等方面,比基于微波暗室的测量方法,有更好的可操作性和可行性。 相似文献
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本研究在明确地空导弹武器装备寿命剖面、任务剖面的基础上,利用已经收集到的19发导弹的冲击、振动遥测数据和6发导弹的弹上温度遥测数据以及已经掌握的大量地面温度、电应力数据,进行数据分析与归纳,生成地空导弹环境剖面,并根据我国现有试验条件,将其转化为可靠性试验剖面。 相似文献
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城镇化是推动我国经济社会发展的重要动力,在高速发展的同时,带来大量污染排放,威胁乡村环境质量与可持续发展。在对乡村生态环境问题剖析的基础上,从战略、实施、方式等层面探索解决思路,围绕科学规划、发展方式、基础建设、管理机制、宣传教育等方面分析关键点,加强乡村环境保护,保障城镇化建设健康发展,为促进农村农业持续发展提供持久动力。 相似文献
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Trametes versicolor decolorized 2000 mg L(-1) of the mono-azo substituted naphthalenic dye Amaranth with no dye sorption observed visually. The changes in the toxicity were assessed over a period of 30 d for the dye-treated viable culture, control (no dye added), and a boiled culture treated with dye, using the Microtox Acute Toxicity assay. Before dye addition, the culture filtrate had some toxicity, which increased after the dye addition. The toxicity of the dye-treated culture decreased during the treatment. The loss of toxicity occurred at the same time, with the loss of color suggesting that detoxification is associated with decoloration. The change in pH was due to natural metabolic processes and had a small effect on detoxification. Because the toxicity of the treatment was similar to that of the control at the end of the treatment, the effluent seems to be safe for release into the environment, potentially rendering this treatment suitable for industrial application. 相似文献
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泵站树状给水管网流量具有随机性,而这种随机性变化会直接影响管网的建设费用和动力费用.针对这-特点,应用随机规划原理,建立泵站树状给水管网机会约束模型,编写基于随机模拟的遗传算法程序求解该模型.机会约束模型能较客观地反映该管网的实际工况,使优化设计结果更符合实际. 相似文献
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Günay Kocasoy 《Environmental management》1989,13(4):469-475
The increase in the number of tourists visiting a coast is desired by most of the countries for economic reasons. However, this increase in tourism may cause pollution of the sea. This can be only avoided by proper planning and by predicting the carrying capacity of the coast in terms of sea pollution. This is especially important for developing countries where part of the wastewater is discharged without any treatment into the sea.In the present study the beaches were classified according to their use — and consequently the amount of waste discharged into the sea — into four groups: (1) coasts that are used only for swimming and recreational purposes; (2) coasts used simultaneously for dwelling, swimming, and recreational purposes; (3) coasts along which only dwellings exist; and (4) natural and man-made harbors, i.e., coasts used as shelters. During the survey,40,320 observations were made between December 1985 and February 1988 to determine the effect of the number of tourists on seawater quality. The results obtained were analyzed by a multilinear regression program to obtain an empirical equation giving the extent of the sea pollution in terms of coliform concentration as a function of population density and some other environmental factors.The equations derived in this study enable the determination of the carrying capacity of a beach in terms of pollution as well as the expected degree of pollution corresponding to a given population density. Furthermore, it allows the prediction of the extra carrying capacity that can be obtained by improving the waste-disposal conditions. 相似文献
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阐释了信息产业专门化街区的内涵,结合对合肥市黄山路信息产业专门化街区构成要素的分类及其邻近度的分析,分别从空间结构演化、景观演化、功能演化三方面阐述了合肥市黄山路由"电子一条街"向"信息产业专门化街区"的总体演化阶段,探讨了信息产业专门化街区的未来发展趋势。 相似文献
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