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陆军进攻战役防空效率指标及制空权评估 被引量:1
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作者 孙巨为 贾春雨 《火力与指挥控制》 CSCD 北大核心 2008年第4期138-142,共5页
结合陆军未来作战样式和实际需求,描述了陆军进攻(反击)战役防空体系的构成及其各系统的主要用途,提出了陆军防空效率评估指标体系中应包括制空权指标的观点,分析了影响该指标的主要因素,用航空集群和导弹集群战斗效率对比的方法描述了... 结合陆军未来作战样式和实际需求,描述了陆军进攻(反击)战役防空体系的构成及其各系统的主要用途,提出了陆军防空效率评估指标体系中应包括制空权指标的观点,分析了影响该指标的主要因素,用航空集群和导弹集群战斗效率对比的方法描述了陆军战役进攻(反击)防空制空权的评估模型,结合示例说明了制空权评估方法的应用。 展开更多
关键词 陆军进攻(反击)战役 体系 效率指标 制空极
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Preparation and application of perovskite-type oxides for electrocatalysis in oxygen/air electrodes 被引量:1
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作者 ZHUANG Shu-xin HE Jia-yi +4 位作者 ZHANG Wei-peng ZHOU Nan LU Mi LIAN Ji-qiong SUN Jing-jing 《Journal of Central South University》 SCIE EI CAS CSCD 2019年第6期1387-1401,共15页
Recent advances in the preparation and application of perovskite-type oxides as bifunctional electrocatalysts for oxygen reaction and oxygen evolution reaction in rechargeable metal-air batteries are presented in this... Recent advances in the preparation and application of perovskite-type oxides as bifunctional electrocatalysts for oxygen reaction and oxygen evolution reaction in rechargeable metal-air batteries are presented in this review.Various fabrication methods of these oxides are introduced in detail,and their advantages and disadvantages are analyzed.Different preparation methods adopted have great influence on the morphologies and physicochemical properties of perovskite-type oxides.As a bifunctional electrocatalyst,perovskite-type oxides are widely used in rechargeable metal-air batteries.The relationship between the preparation methods and the performances of oxygen/air electrodes are summarized.This work is concentrated on the structural stability,the phase compositions,and catalytic performance of perovskite-type oxides in oxygen/air electrodes.The main problems existing in the practical application of perovskite-type oxides as bifunctional electrocatalysts are pointed out and possible research directions in the future are recommended. 展开更多
关键词 perovskite-type oxides ELECTROCATALYSTS PREPARATION oxygen/air electrodes
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Pulsar braking:magnetodipole vs.wind 被引量:1
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作者 Hao Tong 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS CSCD 2016年第1期33-44,共12页
Pulsars are good clocks in the universe. One fundamental question is that why they are good clocks? This is related to the braking mechanism of pulsars. Nowadays pulsar timing is done with unprecedented accuracy. More... Pulsars are good clocks in the universe. One fundamental question is that why they are good clocks? This is related to the braking mechanism of pulsars. Nowadays pulsar timing is done with unprecedented accuracy. More pulsars have braking indices measured.The period derivative of intermittent pulsars and magnetars can vary by a factor of several. However, during pulsar studies, the magnetic dipole braking in vacuum is still often assumed. It is shown that the fundamental assumption of magnetic dipole braking(vacuum condition) does not exist and it is not consistent with the observations. The physical torque must consider the presence of the pulsar magnetosphere. Among various efforts, the wind braking model can explain many observations of pulsars and magnetars in a unified way. It is also consistent with the up-to-date observations. It is time for a paradigm shift in pulsar studies: from magnetic dipole braking to wind braking. As one alternative to the magnetospheric model, the fallback disk model is also discussed. 展开更多
关键词 MAGNETAR magnetic field neutron star pulsar WIND
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Spectral Properties and Positivity of Flows in Infinite Networks with Dynamic Boundary Control Nodes
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作者 Xuelian Jin Fu Zheng +1 位作者 Ming Fang Chao Gao 《Journal of Systems Science and Information》 2009年第4期319-325,共7页
In this paper we study transport processes on infinite networks with dynamic boundary control nodes. These flows can be modeled by operator semigroups on a suitable Banach space. Using functional analytical and graph ... In this paper we study transport processes on infinite networks with dynamic boundary control nodes. These flows can be modeled by operator semigroups on a suitable Banach space. Using functional analytical and graph theoretical methods, we investigate its spectral properties of the system and positivity of the semigroup under appropriate assumptions on the network. 展开更多
关键词 CO-SEMIGROUP SPECTRUM POSITIVITY
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