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高浓度氩气稀释对C2H2-2．5O2气体直接起爆临界能量影响的实验研究

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高压物理学报 2012年第1期26卷 55-62页

作者：张博 lee John H S 白春华北京理工大学爆炸科学与技术国家重点实验室北京100081 Department of Mechanical Engineering McGill University Montreal H3A 2K6Canada

采用高压电点火进行直接起爆,通过放电过程中电流的输出信号确定起爆能量,实验测定了C2H2-2.5O2气体和加入摩尔浓度为70%氩气的C2H2-2.5O2混合气体直接起爆的临界起爆能量,研究了高浓度氩气稀释对C2H2-2.5O2混合物临界起爆能量的影响。... 详细信息

采用高压电点火进行直接起爆,通过放电过程中电流的输出信号确定起爆能量,实验测定了C2H2-2.5O2气体和加入摩尔浓度为70%氩气的C2H2-2.5O2混合气体直接起爆的临界起爆能量,研究了高浓度氩气稀释对C2H2-2.5O2混合物临界起爆能量的影响。实验测得的混合物临界起爆能量实验值与lee等人的表面积能量理论值基本吻合。研究表明:C2H2-2.5O2气体和加入摩尔浓度为70%氩气的C2H2-2.5O2混合气体的临界起爆能量均依赖于初始压力,并呈反相关指数关系;在相同实验条件下,高浓度氩气稀释极大提高了混合气体直接起爆的临界起爆能量。分析认为,由于临界起爆能量正比于诱导区长度的3次方,因此在相同初始压力下,高浓度氩气的稀释增加了C2H2-2.5O2混合气体爆轰诱导区长度,并最终导致其临界起爆能量的显著上升。

关键词：直接起爆临界起爆能量诱导区长度电火花点火氩气

Pressure distribution inside oscillating heat pipe charged with aqueous Al_2O_3 nanoparticles,MWCNTs and their hybrid

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Journal of Central South University 2014年第6期21卷 2341-2348页

作者： Md.Riyad Tanshen Sinil lee Junhyo Kim Donghoon Kang Jungpil Noh HanShik Chung HyoMin Jeong Sunchul Huh Department of Energy and Mechanical Engineering Gyeongsang National UniversityCheondaegukchi-Gil 38TongyeongGyeongnam 650-160Korea Department of Marine Engineering Mokpo National Maritime UniversityHaeyangdaehak-ro 91Mokpo-siJeollanam-do 530-729Korea Department of Naval Architecture and Ocean Engineering Gyeongsang National UniversityInstitute of Marine IndustryCheondaegukchi-Gil 38TongyeongGyeongnam 650-160Korea Department of Energy and Mechanical Engineering Gyeongsang National UniversityInstitute of Marine IndustryCheondaegukchi-Gil 38TongyeongGyeongnam 650-160Korea

Effective thermal performance of oscillating heat pipe(OHP)is driven by inside pressure *** transfer phenomena were reported in terms of pressure and frequency of pressure fluctuation in multi loop OHP charged with aqueous Al2O3 and MWCNTs/Al2O3 *** influences on thermal resistance of aqueous Al2O3,MWCNTs as well as the hybrid of them in OHP having 3 mm in inner diameter were investigated at 60% filling *** results show that thermal characteristics are significantly inter-related with pressure distribution and strongly depend upon the number of pressure fluctuations with *** of pressure depends upon the power input in evaporative section.A little inclusion of MWCNTs into aqueous Al2O3 at 60% filling ratio achieves the highest fluctuation frequency and the lowest thermal resistance at any evaporator power input though different nanofluids cause different thermal performances of OHPs.

关键词： oscillating heat pipe pressure fluctuation thermal resistance nanofluids

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火电厂多代理控制系统(英文)

控制理论与应用 2004年第3期21卷 405-410页

作者：常江 Kwang Y.lee Raul GARDUNO-RAMIREZ 深圳职业技术学院机械电气工程系广东深圳518055 美国宾西法尼亚州州立大学电气工程系电气研究所仪器控制组(IIE)

针对火电厂非线性、多变量和多控制目标的特点,设计了一个火电厂多代理控制系统(PPMACS).在PP MACS中,前馈控制代理(FFCAs)采用神经模糊系统进行决策,反馈控制代理(FBCAs)采用基于遗传算法的模糊系统进行决策.优化任务分解代理(OTDAs)... 详细信息

针对火电厂非线性、多变量和多控制目标的特点,设计了一个火电厂多代理控制系统(PPMACS).在PP MACS中,前馈控制代理(FFCAs)采用神经模糊系统进行决策,反馈控制代理(FBCAs)采用基于遗传算法的模糊系统进行决策.优化任务分解代理(OTDAs)通过一个优化代理和一个分解代理来进行多目标优化分解PPMACS的任务.协调代理根据运行条件协调PPMACS的各个代理.仿真结果显示了火电厂多代理控制系统能够实现火电单元机组的多目标运行和大范围负荷跟踪.神经网络、模糊逻辑和遗传算法是PPMACS中的智能代理进行决策的有效工具.

关键词：决策反馈控制前馈控制模糊逻辑遗传算法多代理控制系统神经网络

RANKL deletion in periodontal ligament and bone lining cells blocks orthodontic tooth movement

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International Journal of Oral Science 2018年第1期10卷 27-35页

作者： Chia-Ying Yang Hyeran Helen Jeon Ahmed Alshabab Yu Jin lee Chun-Hsi Chung Dana T. Graves Department of Orthodontics School of Dental Medicine University of Pennsylvania Philadelphia PA USA Department of Pedodontics School of Dental Medicine University of Pennsylvania Philadelphia PA USA

The bone remodeling process in response to orthodontic forces requires the activity of osteoclasts to allow teeth to move in the direction of the force applied. Receptor activator of nuclear factor-κB ligand(RANKL) is essential for this process although its cellular source in response to orthodontic forces has not been determined. Orthodontic tooth movement is considered to be an aseptic inflammatory process that is stimulated by leukocytes including T and B lymphocytes which are presumed to stimulate bone resorption. We determined whether periodontal ligament and bone lining cells were an essential source of RANKL by tamoxifen induced deletion of RANKL in which Cre recombinase was driven by a 3.2 kb reporter element of the Col1α1 gene in experimental mice(Col1α***+.RANKLf/f) and compared results with littermate controls(Col1α***-.RANKLf/f). By examination of Col1α***+.ROSA26 reporter mice we showed tissue specificity of tamoxifen induced Cre recombinase predominantly in the periodontal ligament and bone lining cells. Surprisingly we found that most of the orthodontic tooth movement and formation of osteoclasts was blocked in the experimental mice, which also had a reduced periodontal ligament space. Thus, we demonstrate for the first time that RANKL produced by periodontal ligament and bone lining cells provide the major driving force for tooth movement and osteoclastogenesis in response to orthodontic forces.

关键词：中国牙科口腔医学

THE RENMINBI ASGAME CHANGER

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Beijing Review 2014年第7期57卷 10-11页

作者： Ann lee New York University

The announcement of the Shanghai Free Trade Zone, which heralds China＇s plans to liberalize the financial economy, has been seen as a welcome indication by most Western financial firms who have been pressuring China for years to allow unrestricted convertibility of its currency, the renminbi. This announcement follows a historical pattern of U.S. policy pressure on other countries＇ monetary management such as when the United States pressured Japan to float its currency in 1973 after the U.S. unilaterally abandoned the gold standard in 1971.

关键词：人民币游戏规则保税区金融货币中国施压美国

Crating Your Bespoke Martini

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China International Business 2010年第10期 56-57页

作者： LEON lee

The Martini is indisputably the most famous of all cocktails. Whether we＇re talking about the classic martini made with gin, vermouth, and olives or a bastardized suffix thereof, conjugated with anything under the su... 详细信息

关键词：定制装箱杜松子酒鸡尾酒性感

Glass Thickness and Fragmentation Behavior in Stressed Glasses

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New Journal of Glass and Ceramics 2012年第4期2卷 116-121页

作者： Hoikwan lee Seoyeong Cho Kyungmin Yoon Jaeho lee Glass Tech Research Center Samsung Corning Precision Materials Asan Korea

Breakage patterns, residual stress, and fractured surfaces on tempered glasses are investigated to find the correlation among glass thickness, tempered level, and the number of fragments, particularly when the glass thickness is less than 4 mm. Relatively thin glasses require high compressive stress for producing fragments, and the required compressive stress is increased with decreasing glass thickness (3.2 to 2.1 mm). By analyzing the residual stress of glasses before and after the fragmentation test, we observe that a relatively thin glass spends more stored energy to generate a new fracture surface and stores less energy for the second cracking as compared to thick glasses. Fractography shows that all glasses have a similar characterization on the fractured surface irrespective of glass thickness. However, the only dif- ference is the depth of the compressive layer. By reducing the depth of the compressive layer to less than approx. 20% of the glass thickness, it is observed that the possibility of producing small fragments is dramatically decreased. There- fore, this study confirms that the compressive stress and its depth are essential as key factors contributing to the achievement of a relatively high fragmentation using a thin glass.

关键词： Fragmentation Breakage Pattern Residual Stress Thin Tempered Glass Fractured Surface

Down to the Country Exploring the Village Life of Guizhou's Ethnic Minorities

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城市漫步（GBA版） 2016年第9期 28-29页

作者： TOM lee 不详

Guizhou is one of China's most ethnically diverse *** 40 percent of the population is non-Han,with the Miao and Dong peoples making up the two most distinctive *** Yunnan is famed all over the world for its bounty of ... 详细信息

关键词： Guizhou attractive Minor

Microsecond scale vibrational spectroscopic imaging by multiplex stimulated Raman scattering microscopy

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Light(Science & Applications) 2015年第1期4卷 454-462页

作者： Chien-Sheng Liao Mikhail N Slipchenko Ping Wang Junjie Li Seung-Young lee Robert A Oglesbee Ji-Xin Cheng Weldon School of Biomedical Engineering Purdue UniversityWest LafayetteIN 47907USA Department of Biological Sciences Purdue UniversityWest LafayetteIN 47907USA Department of Chemistry Purdue UniversityWest LafayetteIN 47907USA

Real-time vibrational spectroscopic imaging is desired for monitoring cellular states and cellular processes in a label-free *** spectroscopic imaging of highly dynamic systems is inhibited by relatively slow spectral acquisition on millisecond to second ***,we report microsecond scale vibrational spectroscopic imaging by lock-in free parallel detection of spectrally dispersed stimulated Raman scattering *** a homebuilt tuned amplifier array,our method enables Raman spectral acquisition,within the window defined by the broadband pulse,at the speed of 32 μs and with close to shot-noise limited detection *** with multivariate curve resolution analysis,our platform allows compositional mapping of lipid droplets in single live cells,observation of intracellular retinoid metabolism,discrimination of fat droplets from protein-rich organelles in Caenorhabditis elegans,spectral detection of fast flowing tumor cells and monitoring drug diffusion through skin tissue in *** reported technique opens new opportunities for compositional analysis of cellular compartment in a microscope setting and high-throughput spectral profiling of single cells in a flow cytometer setting.

关键词： optical microscopy Raman scattering vibrational spectroscopy