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Colored ultrathin hybrid photovoltaics with high quantum efficiency

2005年

作者： David W.S. Wong jay lee.

来源：畅想之星图书光盘版（南... 评论

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畅想之星图书光盘版（南通市图书馆镜像）

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Light(Science & Applications) 2014年第1期3卷 36-42页

作者： Kyu-Tae lee.Jae Yong lee.Sungyong Seo L jay Guo Department of Electrical Engineering and Computer Science The University of MichiganAnn ArborMichigan 48109USA

Most current solar panels are fabricated via complex processes using expensive semiconductor materials,and they are rigid and heavy with a dull,black *** a result of their non-aesthetic appearance and weight,they are primarily installed on rooftops to minimize their negative impact on building *** large surfaces and interiors of modern buildings are not efficiently utilized for potential electric power ***,we introduce dual-function solar cells based on ultrathin dopant-free amorphous silicon embedded in an optical cavity that not only efficiently extract the photogenerated carriers but also display distinctive colors with the desired angle-insensitive ***-energy-harvesting colored signage is ***,a cascaded photovoltaics scheme based on tunable spectrum splitting can be employed to increase power efficiency by absorbing a broader band of light *** study pioneers a new approach to architecturally compatible and decorative thin-film photovoltaics.

关键词： color filters nanocavities organic–inorganic nanostructures photovoltaics spectrum splitting

Bayesian optimal design of step stress accelerated degradation testing

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Journal of Systems Engineering and Electronics 2015年第3期26卷 502-513页

作者： Xiaoyang Li Mohammad Rezvanizaniani Zhengzheng Ge Mohamed Abuali jay lee Science and Technology on Reliability and Environmental Engineering Laboratory Beihang University NSF Industry/University Cooperative Research Center on Intelligent Maintenance Systems University of Cincinnati Beijing Institute of Electronic System Engineering

This study presents a Bayesian methodology for de- signing step stress accelerated degradation testing （SSADT） and its application to batteries. First, the simulation-based Bayesian de- sign framework for SSADT is presented. Then, by considering his- torical data, specific optimal objectives oriented Kullback-Leibler （KL） divergence is established. A numerical example is discussed to illustrate the design approach. It is assumed that the degrada- tion model （or process） follows a drift Brownian motion; the accele- ration model follows Arrhenius equation; and the corresponding parameters follow normal and Gamma prior distributions. Using the Markov Chain Monte Carlo （MCMC） method and WinBUGS software, the comparison shows that KL divergence is better than quadratic loss for optimal criteria. Further, the effect of simulation outiiers on the optimization plan is analyzed and the preferred sur- face fitting algorithm is chosen. At the end of the paper, a NASA lithium-ion battery dataset is used as historical information and the KL divergence oriented Bayesian design is compared with maxi- mum likelihood theory oriented locally optimal design. The results show that the proposed method can provide a much better testing plan for this engineering application.

关键词： accelerated testing Bayesian theory KL divergence,degradation optimal design battery.

Application of a Novel Method for Machine Performance Degradation Assessment Based on Gaussian Mixture Model and Logistic Regression

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Chinese Journal of Mechanical Engineering 2011年第5期24卷 879-884页

作者： LIU Wenbin ZHONG Xin lee.jay LIAO Linxia ZHOU Min Chemical Safety Engineering Research Center of Ministry of Education Beijing University of Chemical Technology Beijing 100029 China The First Research Institute of Ministry of Public Security Beijing 100048 China National Science Foundation Industry/University Cooperative Research Center of Intelligent Maintenance Systems University of Cincinnati Cincinnati OH 45221 USA China National Petroleum Corporation Beijing 100007 China

The currently prevalent machine performance degradation assessment techniques involve estimating a machine＇s current condition based upon the recognition of indications of failure features,which entail complete data collected in different ***,failure data are always hard to acquire,thus making those techniques hard to be *** this paper,a novel method which does not need failure history data is *** packet decomposition（WPD） is used to extract features from raw signals,principal component analysis（PCA） is utilized to reduce feature dimensions,and Gaussian mixture model（GMM） is then applied to approximate the feature space ***-channel confidence value（SCV） is calculated by the overlap between GMM of the monitoring condition and that of the normal condition,which can indicate the performance of ***,multi-channel confidence value（MCV）,which can be deemed as the overall performance index of multi-channel,is calculated via logistic regression（LR） and that the task of decision-level sensor fusion is also *** SCV and MCV can serve as the basis on which proactive maintenance measures can be taken,thus preventing machine *** method has been adopted to assess the performance of the turbine of a centrifugal compressor in a factory of Petro-China,and the result shows that it can effectively complete this *** proposed method has engineering significance for machine performance degradation assessment.

关键词： performance degradation assessment Gaussian mixture model logistic regression proactive maintenance sensor fusion

Cross Trajectory Gaussian Process Regression Model for Battery Health Prediction

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Journal of Modern Power Systems and Clean Energy 2021年第5期9卷 1217-1226页

作者： Jianshe Feng Xiaodong Jia Haoshu Cai Feng Zhu Xiang Li jay lee NSF I/UCR Center for Intelligent Maintenance Systems Department of Mechanical EngineeringUniversity of CincinnatiCincinnatiUSA

Accurate battery capacity prediction is important to ensure reliable battery operation and reduce the ***,the complex nature of battery degradation and the presence of capacity regeneration phenomenon render the prediction task very *** address this problem,this paper proposes a novel and efficient algorithm to predict the battery capacity trajectory in a multi-cell *** proposed method is a new variant of Gaussian process regression(GPR)model,and it utilizes similar trajectories in the historical data to enhance the prediction of desired capacity *** importantly,the proposed method adds no extra computation cost to the standard *** demonstrate the effectiveness of the proposed method,validation tests on two different battery datasets are implemented in the case *** prediction results and the computation cost are carefully benchmarked with cuttingedge GPR approaches for battery capacity prediction.

关键词： Prognostic lithium-ion battery Gaussian process regression state of health

Web-Enabled Remote Machine Monitoring and Prognostics

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航空制造技术 2004年第4期47卷 25-31页

作者： jay lee.Jun Ni NSF Industry/University Cooperative Research Center on Intelligent Maintenance Systems(IMS) Department for Industrial and Manufacturing Engineering University of Wisconsin MilwaukeeWisconsinUSANSF Industry/University Cooperative Research Center on Intelligent Maintenance Systems(IMS) Department of Mechanical EngineeringUniversity of Michigan Ann ArborMichiganUSA

Today's machine tool industries are facing unprecedented challenges brought about by development of outsourcing and low cost manufacturing in Asia. Manufacturing outsourcing provided many opportunities but also added challenges to produce and deliver products with improved productivity, quality, service and costs. Lead times must be cut short to their extreme extend to meet need the changing demands

关键词：通信协议远程监控计算机控制机械加工网络浏览器智能支持系统

Thickness Effect of Nanocrystalline Layer on the Deformation Mechanism of Amorphous/Crystalline Multilayered Structure

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Computer Modeling in Engineering & Sciences 2019年第8期120卷 293-304页

作者： Wen-jay lee.Yu-Chien Lo Anchen Yang Kuanpeng Chen Nan-Yow Chen National Center for High-Performance Computing No.22Keyuan Rd.Central Taiwan Science ParkTaichung City 40763Taiwan Department of Materials Science and Engineering National Chiao Tung UniversityNo.1001 University Rd.Hsinchu 30010Taiwan National Center for High-Performance Computing No.7R&D 6th Rd.Hsinchu Science ParkHsinchu City 30076Taiwan

Different thickness of amorphous/nanocrystalline multi-layered structure can be used to modulate the strength and ductility of the composite *** this work,molecular dynamics simulations were conducted to study the thickness effect of nanocrystalline layer on mechanical properties and deformation behavior of the Cu64Zr36/Cu multi-layer *** stress-strain relationship,local stress,local strain,and deformation mechanism are *** results reveal that the change of thickness of the crystalline layer significantly affects the mechanical properties and deformation *** the strain at the elastic region,the amorphous Cu64Zr36 layer dominates the mechanical behavior,leading the fact that Young’s modulus,first yielding stress,and first yielding strain are close to that of Cu64Zr36 *** the strain at the plastic region,the contribution of the crystalline layer on the mechanical behavior becomes more and more significant with increasing the thickness of the crystalline *** the thickness ratio(amorphous/crystalline)of 4,the shear band deformation of amorphous layer dominates the mechanical *** the thickness ratio is 1,the glide dislocation of the crystalline layer dominates the stress-strain behavior.

关键词： Molecular dynamics Cu64Zr36 bulk metallic glass Cu64Zr36/Cu layered structure shear band mechanical property deformation

Vibration-controlled Transient Elastography for Assessment of Liver Fibrosis at a USA Academic Medical Center

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Journal of Clinical and Translational Hepatology 2022年第2期10卷 197-206页

作者： Max Shen Anna lee.jay H.Lefkowitch Howard J.Worman Department of Medicine Vagelos College of Physicians and SurgeonsColumbia UniversityNew YorkNYUSA Department of Pathology and Cell Biology Vagelos College of Physicians and SurgeonsColumbia UniversityNew YorkNYUSA

Background and Aims:Vibration-controlled transient elastography(VCTE)is a noninvasive tool that uses liver stiffness measurement(LSM)to assess *** real-life data during everyday clinical practice in the USA are lacking,we describe the patterns of use and diagnostic performance of VCTE in patients at an academic medical center in New York ***:Patients who received VCTE scans were included if liver biopsy was performed within 1 *** performance of VCTE in differentiating dichotomized fibrosis stages was assessed via area under the receiver operating characteristics(AUROC).Fibrosis stage determined from VCTE LSM was compared to liver ***:Of 109 patients,49 had nonalcoholic fatty liver disease,16 chronic hepatitis C,15 congestive hepatopathy,and 22 at least two *** was 0.90 for differentiating cirrhosis(stage 4)with a positive predictive value(PPV)range of 0.28 to 0.45 and negative predictive value range of 0.96 to *** 31(32%)patients,VCTE fibrosis stage was at least two stages higher than liver biopsy fibrosis *** of thirty-five pa-tients considered to have cirrhosis by VCTE had stage 0 to 2 and 12 stage 3 fibrosis on liver ***:VCTE has reasonable diagnostic accuracy and is reliable at ruling out ***,because of its low PPV,caution must be exercised when used to diagnose cirrhosis,as misdiagnosis can lead to unnecessary health care *** routine practice,VTCE is also sometimes performed for disease etiologies for which it has not been robustly validated.

关键词： Chronic liver disease Cirrhosis Hepatitis Liver histopathology Nonalcoholic fatty liver disease

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面向产品与制造业创新的e-智能策略

中国机械工程 2001年第5期12卷 526-530,6页

作者： jay lee.李高正美国Wisconsin-Milwaukee大学自动化系华中科技大学

在 2 1世纪 ,基于互联网的 e-智能维护是企业能否在 6-σ产品的售后服务和制造业的生产率方面取得全球领先地位的关键技术。就怎样利用这种技术对产品设计和制造系统的创新进行了讨论。介绍了工业中产品与制造系统创新的发展趋势 ,并展... 详细信息

在 2 1世纪 ,基于互联网的 e-智能维护是企业能否在 6-σ产品的售后服务和制造业的生产率方面取得全球领先地位的关键技术。就怎样利用这种技术对产品设计和制造系统的创新进行了讨论。介绍了工业中产品与制造系统创新的发展趋势 ,并展望了其应用前景。介绍了未来对产品设计、制造与售后服务策略的需求和共同关心的焦点问题。讨论了面向产品预测的电智能的设计及其在将 6-σ产品的服务自动化转化为商务自动化优势方面将产生的影响。

关键词： e-智能远程维护创新产品设计敏捷制造互联网自动化

Decorative near-infrared transmission filters featuring high-efficiency and angular-insensitivity employing ID photonic crystals

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Nano Research 2019年第3期12卷 543-548页

作者： Chengang Ji Chenying Yang Weidong Shen Kyu-Tae lee.Yueguang Zhang Xu Liu L.jay Guo Department of Electrical Engineering and Computer Science The University of Michigan Ann Arbor Michigan 48109 USA State Key Laboratory of Modern Optical Instrumentation Department of Optical Engineering Zhejiang University Hangzhou 310027 China Department of Physics Inha University Incheon 22212 Republic of Korea

We present a new scheme for visibly-opaque but near-infrared-transmitting filters involving 7 layers based on one-dimensional ternary photonic crystals, with capabilities in reaching nearly 100% transmission efficiency in the near-infrared region. Different decorative reflection colors can be created by adding additional three layers while maintaining the near-infrared transmission performance. In addition, our proposed structural colors show great angular insensitivity up to ±60° for both transverse electric and transverse magnetic polarizations, which are highly desired in various fields. The facile strategy described here involves a simple deposit!on method for the fabrication, thereby having great potential in diverse applications such as image sensors, anti-counterfeit tag, and optical measurement systems.

关键词： near-infrared (NIR)-transmitting filters colored decorations photonic crystals multilayer structures