Effect of Molecular Additives on the Ignition of Methane–Air Mixtures

Combustion, Explosion, and Shock Waves - The ignition of methane–air mixtures with additives of ClF5, ClF3, OF2, and H2O2 (additive content in the mixtures  $$\le$$ 1%) is studied by...     

Multilayer Composites Based on PTFE Films and Fiberglass

Fibre Chemistry - The article is devoted to the development of two-layer composites with a fluoroplastic matrix and fiberglass reinforcing elements. The fluoroplastic matrix acts as a protective...     

Effect of Al in Ti－microalloyed Mn－Ni－Mo welding wire on microstructure and toughness of deposited metal

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Fracture and mechanical properties of P100 Gr/6061 Al composite

The effects of heat treatments on the mechanical and fracture properties of continuous fiber Pitch 100 graphite/6061 aluminum (P100 Gr/6061 Al) composite were evaluated by varying solution temperature and aging time. All heat treatments resulted in decreased mechanical properties due to the reaction at the fiber/matrix interface during solution treatments. SEM analysis of the fractured samples showed a large degree of fiber pullout, interface failure, and matrix cracking.     

Preparation and characterization of GaN films grown on Ga-diffused Si （111） substrates

Hexagonal GaN films were prepared by nitriding Ga2O3 films with flowing ammonia. Ga2O3 films were deposited on Ga-diffused Si (111) substrates by radio frequency (r.f.) magnetron sputtering. This paper have investigated the change of structural properties of GaN films nitrided in NH3 atmosphere at the temperatures of 850, 900, and 950℃ for 15 min and nitrided at the temperature of 900℃ for 10, 15, and 20 rain, respectively. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS) were used to analyze the structure, surface morphology and composition of synthesized samples. The results reveal that the as-grown films are polycrystalline GaN with hexagonal wurtzite structure and GaN films with the highest crystal quality can be obtained when nitrided at 900℃ for 15 min.     

中英规范有关建筑物防雷接地做法的比较

结合国家标准GB 50057-2010《建筑物防雷设计规范》和BS规范BS EN 62305-2006《Protection against lightning》,介绍了两本规范中建筑物防雷装置做法,简述了两种规范中有关建筑物外部防雷(接闪器、引下线、接地装置)、内部防雷以及防雷击电磁脉冲的有关规范条文规定和比较。     

一种新型不同容量逆变器并联方法

传统的逆变器并联方法一般只适用于功率容量一致的逆变器,针对不同容量逆变器的并联方法较少。本文在对几种不同容量逆变器并联方法分析研究的基础上,提出了一种新型的逆变器并联方法。该方法采用电压型逆变器和电流型逆变器混合并联的方式,利用电压型逆变器提供电压基准,电流型逆变器输出电流可以稳定电网电压,实现并联。该方法算法简单,适合大部分的逆变器并联场合,经过仿真和实验证明了其有效性和可行性。