检索结果-内蒙古大学图书馆

Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XIII

作者： Ee, Yik-Khoon Kumnorkaew, Pisist Tong, Hua Arif, Ronald A. Gilchrist, James F. Tansu, Nelson Center for Optical Technologies Department of Electrical and Computer Engineering Lehigh University Bethlehem PA 18015 United States Center for Advanced Materials and Nanotechnology Department of Chemical Engineering Lehigh University Bethlehem PA 18015 United States

Improvement of light extraction efficiency of InGaN light emitting diodes (LEDs) using polydimethylsiloxane (PDMS) concave microstructures arrays was demonstrated. The size effect of the concave microstructures on the light extraction efficiency of III-Nitride LEDs was studied. Depending on the size of the concave microsturctures, ray tracing simulations show that the use of PDMS concave microstructures arrays can lead to increase in light extraction efficiency of InGaN LEDs by 1.4 to 1.9 times. Experiments utilizing 1.0 μm PDMS concave microstructures arrays demonstrated 1.60 times improvement in light extraction, which is consistent with simulated improvement of 1.63 times. The enhancement in light extraction efficiency is attributed to increase in effective photon escape cone due to PDMS concave micro structure s arrays, and reduced Fresnel reflection within the photon escape cone due to the grading of refractive index change between GaN / PDMS / air interface. © 2009 SPIE.

关键词： Microstructure

来源：评论

学校读者我要写书评

暂无评论

The use of polydimethylsiloxane concave microstructures arrays to enhance light extraction efficiency of InGaN quantum wells light-emitting diodes

The use of polydimethylsiloxane concave microstructures arra...

引用

Conference on Lasers and Electro-Optics, CLEO 2009

作者： Ee, Yik-Khoon Kumnorkaew, Pisist Arif, Ronald A. Tong, Hua Gilchrist, James F. Tansu, Nelson Center for Optical Technologies Department of Electrical and Computer Engineering Lehigh University Bethlehem PA 18015 United States Center for Advanced Materials and Nanotechnology Department of Chemical Engineering Lehigh University Bethlehem PA 18015 United States

Novel approach to improve light extraction efficiency of InGaN-based light emitting diodes with polydimethylsiloxane concave microstructures arrays was demonstrated, which leads to enhancement of extraction efficiency... 详细信息

ISBN: (纸本)9781557528698

关键词： Silicones

来源：评论

学校读者我要写书评

暂无评论

Growths of InGaN quantum wells light-emitting diodes on nano-patterned AGOG sapphire substrate using abbreviated growth mode

Growths of InGaN quantum wells light-emitting diodes on nano...

引用

Conference on Lasers and Electro-Optics, CLEO 2009

作者： Ee, Yik-Khoon Biser, Jeff Cao, Wanjun Chan, Helen M. Vinci, Richard P. Tansu, Nelson Center for Optical Technologies Department of Electrical and Computer Engineering Lehigh University Bethlehem PA 18015 United States Center for Advanced Materials and Nanotechnology Dept. of Material Science and Engineering Lehigh University Bethlehem PA 18015 United States

Nanoheteroepitaxy of InGaN-based light-emitting diodes on patterned AGOG sapphire by using abbreviated growth mode, leads to significant reduction in dislocation density and 24% increase in efficiency. © 2009 Opt... 详细信息

ISBN: (纸本)9781557528698

关键词： Sapphire

来源：评论

学校读者我要写书评

暂无评论

Benchmark Tests of Active Disturbance Rejection control on an Industrial Motion control Platform

Benchmark Tests of Active Disturbance Rejection Control on a...

引用

2009 American control Conference (ACC 2009)

作者： Gang Tian Zhiqiang Gao Center for Advanced Control Technologies Department of Electrical and Computer Engineering Cleveland State University Cleveland OH 44115 USA

ISBN: (纸本)9781424445233

The improvement of Active Disturbance Rejection control over the existing industry controller is benchmarked with the state of the art industrial automation equipment, using the common PLC, drive, and the mechanical transmissions of belt, gear, and direct coupling. All together 168 tests are run at various line speeds, different levels of pulse-like torque disturbance, and with various viscous friction. The results are tabulated for comparison, in terms of integrated absolute error and maximum error observed, and the RMS and peak torque required from the drive motor. In the worst case scenarios, across all variations of mechanical configuration, we observe the performance improvement from just under 20percent to 290percent, with comparable control efforts. Together with simplicity in the control algorithm itself, the ease of tuning and operation, such improvement establishes ADRC as a viable replacement of the existing industry controller in manufacturing.

关键词： Robust control Benchmark testing state of the art disturbing torque Machine Configuration MECHANICAL TRANSMISSIONS computer algorithms performance boost Motor control absolute error directly coupled DC motors maximum error peak torque BENCHMARKS

来源：评论

学校读者我要写书评

暂无评论

From Poncelet's Invariance Principle to Active Disturbance Rejection

From Poncelet's Invariance Principle to Active Disturbance R...

引用

2009 American control Conference (ACC 2009)

作者： Gang Tian Zhiqiang Gao Center for Advanced Control Technologies Department of Electrical and Computer Engineering Cleveland State University Cleveland OH 44115 USA

ISBN: (纸本)9781424445233

This is a brief survey of a little known field of disturbance estimation and subsequent cancellation, a field with a long history and is still rather disorganized. Researchers and results are scattered over almost two centuries, across East and West: from Jean-Victor Poncelet's Principle of Invariance in 1829, to Jingqing Han's conception of Active Disturbance Rejection in 1995 and beyond. But the field in recent years is maturing and coming into a focus with significant practical and theoretical implications abound. It provides a powerful alternative to the modern control paradigm in how real world control problems, of which disturbance rejection is a central theme, are viewed and solved. In this paper a reader will find a brief history of ideas, a new, unifying, problem formulation, and a summary of recent stability analysis results.

关键词： Disturbance rejection invariance Problem Formulation Stability analysis Maturity modern control

来源：评论

学校读者我要写书评

暂无评论

The use of polydimethylsiloxane concave microstructures arrays to enhance light extraction efficiency of InGaN quantum wells light-emitting diodes

The use of polydimethylsiloxane concave microstructures arra...

引用

Conference on Lasers and Electro-Optics (CLEO)

作者： Yik-Khoon Ee Pisist Kumnorkaew Ronald A. Arif Hua Tong James F. Gilchrist Nelson Tansu Center for Optical Technologies Department of Electrical and Computer Engineering Lehigh University Bethlehem PA USA Center for Advanced Materials and Nanotechnology Department of Chemical Engineering Lehigh University Bethlehem PA USA

关键词： Microstructure Optical arrays Light emitting diodes Lenses Microoptics Computational modeling Stimulated emission Optical refraction Optical variables control Optical scattering

来源：评论

学校读者我要写书评

暂无评论

Growths of InGaN quantum wells light-emitting diodes on nano-patterned AGOG sapphire substrate using abbreviated growth mode

Growths of InGaN quantum wells light-emitting diodes on nano...

引用

Conference on Lasers and Electro-Optics (CLEO)

作者： Yik-Khoon Ee Jeff Biser Wanjun Cao Helen M. Chan Richard P. Vinci Nelson Tansu Center for Optical Technologies Department of Electrical and Computer Engineering Lehigh University Bethlehem PA USA Center for Advanced Materials and Nanotechnology Department of Material Science and Engineering Lehigh University Bethlehem PA USA

关键词： Light emitting diodes Gallium nitride Epitaxial growth Substrates Temperature Etching Optical buffering Nanoscale devices Nanostructures Annealing

来源：评论

学校读者我要写书评

暂无评论

Complex human disorders and molecular system engineering: Historical perspective and potential impacts

Complex human disorders and molecular system engineering: Hi...

引用

Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： Effat S. Emamian Ali Abdi Advanced Technologies for Novel Therapeutics (ATNT) Enterprise Development Center Newark NJ USA Department of Electrical and Computer Engineering New Jersey Institute of Technology Newark NJ USA

The challenging nature of complex human disorders has taught us that we can not untangle a disorder unless we understand how the ldquoenginerdquo of molecular systems works. After learning the basic physiology of different organs in the human body, a ldquomolecular revolutionrdquo occurred, which has now generated a huge amount of information regarding the function of individual molecules in human cells. The difficult task, however, is to understand how thousands of molecules communicate and work together to deliver a specific function, and more importantly, what goes wrong when the system fails and causes different diseases. The emerging field of systems biology is now opening the door for engineers, to join molecular biologists and enter the era of molecular biomedical engineering.

关键词： Humans Systems engineering and theory Biological system modeling Cells (biology) Fault diagnosis Systems biology Biological systems DNA Engines Biomedical engineering

来源：评论

学校读者我要写书评

暂无评论

Comparison of rotary cement kiln identified models

Comparison of rotary cement kiln identified models

引用

International Conference on control and Automation (ICCA)

作者： G. Noshirvani A. Fatehi B. Araabi M. Shirvani M. Azizi ACER Markaz Branch Arak Iran Advanced Process Automation & Control Research group Electrical Engineering Department K.N. Toosi University of Technology Tehran Iran Control and Intelligent Processing Center of Excellence Electrical and Computer Engineering Department University of Tehran Tehran Iran Chemical Engineering Department and member of Cement Research Center University of Science and Technology Tehran Iran Saveh Cement Company Saveh Iran

Rotary cement kiln is the main part of a cement plant that clinker is produced in it. Clinker is the main ingredient of cement. Continual and prolonged operation of rotary cement kiln is vital in cement factories. However, prolonged operation of the kiln is not possible and periodic repairs of the refractory lining would become necessary, due to non-linear phenomena existing in the kiln, such as sudden falls of coatings in the burning zone and probability of damages to the refractory materials during production. This is the basic reason behind the needs for a comprehensive model which is severely necessary for better control of this process. Such a model can be derived based on the mathematic analysis with consultation of expert operator experiences. In this paper both linear and nonlinear model are identified for rotary kiln of Saveh white cement factory. The linear model is introduced using Box-Jenkins structure. The results of the obtained model were satisfactory compared to some other linear models and can be used for designing adaptive or robust controllers. Also, nonlinear system identification via Neural Network technique is performed and its result was compared to linear models.

关键词： Kilns Production facilities Coatings Building materials Process control Mathematical model Mathematics Programmable control Adaptive control Robust control

来源：评论

学校读者我要写书评

暂无评论

Anisotropic Metamaterials Emulated by Tapered Waveguides: Application to Optical Cloaking

引用

Physical Review Letters 2009年第21期102卷 213901-213901页

作者： Igor I. Smolyaninov Vera N. Smolyaninova Alexander V. Kildishev Vladimir M. Shalaev Advanced Technologies BAE Systems 1250 24 Street NW Washington D.C. 20037 USA Department of Physics Astronomy and Geosciences Towson University 8000 York Road Towson Maryland 21252 USA Birck Nanotechnology Center School of Electrical and Computer Engineering Purdue University West Lafayette Indiana 47907 USA

We demonstrate that metamaterial devices requiring anisotropic dielectric permittivity and magnetic permeability may be emulated by specially designed tapered waveguides. This approach leads to low-loss, broadband performance. Based on this technique, we demonstrate broadband electromagnetic cloaking in the visible frequency range on a scale ∼100 times larger than the wavelength.

关键词： Magnetic permeability

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：