Modulating lateral strain in GaN-based epitaxial layers by patterning sapphire substrates with aligned carbon nanotube films

A novel carbon nanotube-patterned sapphire substrate (CPSS) has been utilized for the growth of GaN material and fabrication of a InGaN/GaN light emitting diode (LED) by metal-organic vapor phase epitaxy. Different lateral strain distributions and stress reductions were observed in a GaN thin film on CPSS compared with those on a conventional sapphire substrate. Nanoheteroepitaxy induced by small size nucleation islands of about 50 nm is ascribed to this significant strain modulation. The crystalline quality of the GaN thin film was also improved, as illustrated by X-ray diffraction. Performances of 1 mm × 1 mm LEDs on CPSS were also enhanced, with an operational power increase of 37.5% and higher saturation current.      

循环函数法在回热系统中的局部定量计算

根据等效焓降法在热力系统计算时的特点,推导了循环函数法在回热系统中的局部定量计算方法,导出了回热系统局部定量计算的几个重要结论.最后,通过实例计算对所得结论进行了验证.验证结果表明,该方法在回热系统局部定量计算过程中具有简洁、准确、概念清晰等特点,适合推广.     

Ultra-thin Body Buried In0.35Ga0.65As Channel MOSFETs with Extremely Low Off-current on Si Substrates

In this paper, we investigated the electrical properties of the Metal-oxide-semiconductor gate stack of Ti/Al2O3/InP under different annealing conditions. A min...     

海上平台电气系统无人化方案设计

目前国内外越来越多边际油田开发借助无人平台来实现,降低油田开发成本的同时,也对平台生产安全提出更高要求。无人平台电气系统的设计以系统网架结构简化为基础,以实现全面监测、远程调控和安全可靠运行为目的,以现有能量管理系统为基础平台,将电气系统、能量管理系统及各设备监测系统等联合实现远程管控,从而为海上油气生产提供可靠、安全的供电保障。主要探讨海上油气田工程设施电气无人化的设计方法,结合南海某海上油田工程设计案例,详细论述无人平台电气设计方案,从具体设计工作中提炼出符合海上平台电气系统的无人化通用做法,为海上油气田无人化的推广应用以及无人平台电气系统的设计提供参考和借鉴。     

河南电视台250平米演播室视音频系统改造方案

河南电视台250平米演播室于2007年10月进行了视音频系统数字化改造。同时建立了演播室收录播出网络系统,将演播室和节目制作网络进行无缝连接,从而达到了无磁带播出和不同网络系统的互联互通。本文对整体方案进行了分析。     

Systematic adsorption process of petroleum hydrocarbon by immobilised petroleum-degradation bacteria system in degradation pathways

In order to effectively control petroleum hydrocarbon pollution by immobilisation technology,it is necessary to understanding the degradation pathways of petrol...     

Key Residues Affecting Binding Affinity of Sirex noctilio Fabricius Odorant-Binding Protein (SnocOBP9) to Aggregation Pheromone

Sirex noctilio Fabricius (Hymenoptera Siricidae) is a major quarantine pest responsible for substantial economic losses in the pine industry. To achieve better pest control, (Z)-3-decen-ol was identified as the male pheromone and used as a field chemical trapping agent. However, the interactions between odorant-binding proteins (OBPs) and pheromones are poorly described. In this study, SnocOBP9 had a higher binding affinity with Z3D (Ki = 1.53 ± 0.09 μM) than other chemical ligands. Molecular dynamics simulation and binding mode analysis revealed that several nonpolar residues were the main drivers for hydrophobic interactions between SnocOBP9 and Z3D. Additionally, computational alanine scanning results indicated that five amino acids (MET54, PHE57, PHE71, PHE74, LEU116) in SnocOBP9 could potentially alter the binding affinity to Z3D. Finally, we used single-site-directed mutagenesis to substitute these five residues with alanine. These results imply that the five residues play crucial roles in the SnocOBP9-Z3D complex. Our research confirmed the function of SnocOBP9, uncovered the key residues involved in SnocOBP9-Z3D interactions, and provides an inspiration to improve the effects of pheromone agent traps.     

含短纤维胎面胶的混炼工艺

介绍了含短纤维胎面胶的混炼工艺,分析了在混炼过程中短纤维在橡胶中的混合分散模型.指出当短纤维-橡胶复合材料处于最佳黏度状态时,混炼效果最佳.