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20561.用于太阳能制氢的新型纳米材料的光捕捉和电荷转移动力学的原子时域仿真
[专用设备制造业] [2014-07-20]
Over the past year, the results of the DOE funded research were summarized in 3 review articles. 12 original manuscripts were written. The research results were reported in 28 invited talks at conferences and university seminars. 20 invitations were accepted for talks in the near future. 2 symposia at national and international meetings have being organized this year on topics closely related to the DOE funded project, and 2 more symposia have been planned for the near future. We summarized the insights into photoinduced dynamics of semiconductor QDs, obtained from our time-domain ab initio studies. QDs exhibit both molecular and bulk properties. Unlike either bulk or molecular materials, QD properties can be modified continuously by changing QD shape and size. However, the chemical and physical properties of molecular and bulk materials often contradict each other, which can lead to differing viewpoints about the behavior of QDs. For example, the molecular view suggests strong electron-hole and charge-phonon interactions, as well as slow energy relaxation due to mismatch between electronic energy gaps and phonon frequencies. In contrast, the bulk view advocates that the kinetic energy of quantum confinement is greater than electron-hole interactions, that chargephonon coupling is weak, and that the relaxation through quasi-continuous bands is rapid. By synthesizing the bulk and molecular viewpoints, we clarified the controversies and provided a unified atomistic picture of the nature and dynamics of photoexcited states in semiconductor QDs.
关键词:电子转移;制氢;太阳能;碳;配置
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20562.全球油田设备租赁市场报告(2014年-2018年)
[石油加工、炼焦和核燃料加工业,专用设备制造业] [2014-07-18]
Rental oilfield equipment is used for the extraction of oil and gas from reservoirs. This equipment is either taken on rent or leased by the oilfield operators as it reduces the capital cost for them.
关键词:租赁油田设备;石油;天然气;水库抽取;钻井设备;压力;控制阀
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20563.基于联合循环发动机进气模型的轮机模式转变的先进冲击位置控制
[专用设备制造业] [2014-07-18]
A dual flow-path inlet system is being tested to evaluate methodologies for a Turbine Based Combined Cycle (TBCC) propulsion system to perform a controlled inlet mode transition. Prior to experimental testing, simulation models are used to test, debug, and validate potential control algorithms. One simulation package being used for testing is the High Mach Transient Engine Cycle Code simulation, known as HiTECC. This paper discusses the closed loop control system, which utilizes a shock location sensor to improve inlet performance and operability. Even though the shock location feedback has a coarse resolution, the feedback allows for a reduction in steady state error and, in some cases, better performance than with previous proposed pressure ratio based methods. This paper demonstrates the design and benefit with the implementation of a proportional-integral controller, an H-Infinity based controller, and a disturbance observer based controller.
关键词:进气道流;控制器;反馈控制;计算机仿真;涡轮发动机
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20564.用于髋关节植入物的应用的生物医药联合合金的发展
[专用设备制造业,医药制造业] [2014-07-18]
The development of cobalt alloys for the development of HIP implants has been evolving overtime. Accordingly, in this work an overview of the main microstructural factors that impact the mechanical properties, as well as the effect of interstitials such as carbon and nitrogen. In addition the role alloy pre-straining and heat treating on the amount of ε-martensite and on the exhibited mechanical properties is described. In general, it is shown that as the amount of ε-martensite exceeds 60 vol. percent, the alloy ductility is drastically reduced as the HCP phase becomes dominant in the matrix.
关键词:生物医学钴合金;植入物;ε-马氏体;相变;力学性能
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20565.全球汽车自动调光后视镜市场报告(2014-2018年)
[汽车制造业,专用设备制造业] [2014-07-18]
Dimming mirrors were initially introduced in fighter aircraft to reduce brightness. Gentex was credited with the first electromechanical dimming rearview mirror in 1982. Auto dimming mirrors reduce annoying glare at night that can impair vision.
关键词:防眩目后视镜;战斗机;降低亮度;汽车自动调光镜
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20566.低成本钛合金生物医学应用研究与发展
[专用设备制造业,医药制造业] [2014-07-18]
β-type titanium alloys comprising low cost elements such as Fe, Mn, Cr, Sn, Al, O and N and having low Young's modulus are currently being developed. Examples of such alloys include Ti-10Cr-Al, Ti-Mn, Ti-Mn-Fe, Ti-Mn-Al, Ti-Cr-Al, Ti-Sn-Cr, Ti-Cr-Sn-Zr, Ti-(Cr, Mn)-Sn, and Ti-12Cr. Ti-5Fe-3Nb-3Zr belongs to that class of titanium alloys in which rare metals such as Nb, Ta, and Zr have been reduced using Fe. Ti-5Fe-3Nb-3Zr has a Young's modulus of around 76 GPa and has greater strength than that of Ti-6Al-4V ELI for biomedical applications. The characteristics of Ti-5Fe-3Nb-3Zr and other low-cost beta-type titanium alloys with low Young's moduli are discussed from the viewpoint of biomedical applications.
关键词:β型钛合金;低杨氏模量;;廉价的元素;普通金属;间隙元素
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20567.鼓式碎浆机的应用
[专用设备制造业] [2014-07-15]
介绍了鼓式碎浆机在不同流程中的特征、鼓式碎浆机与传统水力碎浆系统的不同及鼓式碎浆机的发展现状.
关键词:鼓式碎浆机;ONP;能耗;疏解
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20568.超声场下搅拌特性的试验研究
[专用设备制造业] [2014-07-15]
在自制的数字化搅拌设备实验平台的基础上,以水和不同浓度的CMC溶液为介质,探索超声波场对搅拌功率特性和搅拌混合特性影响的试验研究.结果表明:在本试验所用介质中,超声波对搅拌功率影响不大;在低黏度介质中,超声波对混合特性影响不大,在中黏度介质中,超声波可以明显改善混合特性.
关键词:超声波;搅拌特性;超声介质;黏度;混合时间
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20569.碱回收锅炉Ⅲ级过热器腐蚀原因分析
[专用设备制造业] [2014-07-15]
某碱回收锅炉Ⅲ级(高温)过热器发生严重腐蚀,通过对燃料、材质、腐蚀产物成分分析及金相分析,确定造成腐蚀的主要原因是设计缺陷和燃料问题.
关键词:碱回收锅炉;高温过热器;燃料;腐蚀
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20570.锅炉烟气除尘脱硫系统存在问题及改造方案
[专用设备制造业] [2014-07-15]
介绍了云南云景林纸股份有限公司动力厂锅炉除尘脱硫系统基本情况和运行概况,对存在的问题进行分析并提出相应的改造建议.
关键词:锅炉;除尘脱硫系统;运行;存在问题;改造建议