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微热板的热测试和热分析

工程热物理学报 2001年第2期22卷 226-228页

作者：顾毓沁张荣海朱德忠孙晓毅阎桂珍唐祯安 Philip c.h. chan Johnny K.O. Sin I-Ming Shing 清华大学工程力学系北京100084 北京大学电子工程系北京100871 大连理工大学电子工程系辽宁大连116023 香港科技大学电机及电子工程学系

随着近代高新技术的发展，要求各种探测器微型化。微加工技术的进步，使得微器件制造有了可能，于是微传感器就应运而生了。微热板作为一种微型加热器在微传感器中有着极为重要的作用。它的温度分布和热特性直接影响微传感器的工作性能... 详细信息

随着近代高新技术的发展，要求各种探测器微型化。微加工技术的进步，使得微器件制造有了可能，于是微传感器就应运而生了。微热板作为一种微型加热器在微传感器中有着极为重要的作用。它的温度分布和热特性直接影响微传感器的工作性能，为此微热板的热测试和热分析成为微传感器的研制、使用和评价所必不可少的工作。本文件对研制中的气体传感器的微热板，用红外热成像技术进行热测试和分析，获得气体传感器微热板的微小区域的温度分布，为传感器的研制提供了可靠的依据。

关键词：微热板传感器红外热成像热测试热分析

Scattering of Waves by Random Rough Surfaces with Applications in Microwave Remote Sensing and Wireless communications

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Scattering of Waves by Random Rough Surfaces with Applicatio...

Recent progress of interconnecting layer for tandem organic solar cells

2002海峡两岸三地无线科技研讨会

作者： L. Tsang K.W. Lam Qin Li K.L. Lai L. Zhou c.h. chan L. Zheng Wireless communication Research center City University of Hong Kong Hong Kong Department of Electrical Engineering University of Washington Seattle WA USA Department of Electrical Engineering University of Washington Seattle WA USA Wireless communication Research center City University of Hong Kong Hong Kong Department of Electrical Engineering University of Washington Seattle WA USA Wireless communication Research center City University of Hong Kong Hong Kong Department of Electrical Engineering University of Washington Seattle WA USA Department of Electrical Engineering University of Washington Seattle WA USA

The effects of random rough surfaces in remote sensing and in wireless communication are studied with the 3-dimensional numerical simulations of Maxwell equations. In remote sensing, we study the angu

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Science china chemistry 2017年第4期60卷 460-471页

作者： Shunmian Lu Dan Ouyang Wallace c.h. choy Department of Electrical and Electronic Engineering The University of Hong Kong Pok Fu Lam Road Hong Kong China

This paper has reviewed:(1) the two unique advantages of tandem organic solar cells(OScs) compared to single OScs;(2) the challengings as well as strategies to develop qualified interconnecting layer(IcL) for tandem *** specifically,firstly,the two key advantages unique to tandem OScs as compared to single OScs,namely minimizing sub-bandgap transmission and thermalization loss as well as realizing optical thick and electrical thin structures,have been ***,the IcL,as one of the most challenging issue in tandem OScs that needs to fulfill the optical,electrical and mechanical requirements simultaneously to realize a qualified IcL has been *** one of the most challenging requirement among the three,the electrical requirement and its corresponding three different solving strategies have been discussed in detail,revealing a bright future for developing a general strategy to realizing qualified IcL composed of different hole transporting layer(hTL) and electron transporting layer(ETL).

关键词： tandem organic solar cell interconnecting layer

Formation of TiN Grid on NiTi by Laser Gas Nitriding for Improving Wear Resistance in hanks' Solution

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Journal of Materials Science & Technology 2016年第5期32卷 459-464页

作者： c.h.Ng O.K.chan h.c.Man Department of Industrial and Systems Engineering The Hong Kong Polytechnic University

Laser gas nitriding （LGN） is a common surface modification method to enhance the wear resistance of titanium （Ti） alloys, which are known to have poor tribological properties. In the present study, a titanium nitride （TIN） grid network was fabricated on the surface of nickel titanium （NiTi） by LGN. The laser processing parameters were selected to achieve nitriding without surface melting and hence to＇maintain a smooth surface finish. The characteristics of the grid-nitrided samples were investigated by scanningelectron microscopy, X-ray diffractometry, optical microscopy, 2-D profilometry, contact angle measurements and nanoindentation. The wear resistance of the nitrided samples was evaluated using reciprocating wear test against ultra-high-molecular-weight polyethylene （UhMWPE） in hanks＇ solution. The results indicate that the wear rates of the grid-nitrided samples and the UhMWPE counter-body in the wear pair are both significantly reduced. The decrease in wear rates can be attributed to the combination of a hard TiN grid and a soft NiTi substrate. In hanks＇ solution, the higher hydrophilicity of the nitrided samples also contributes to the better performance in wear test against hydrophobic UhMWPE.

关键词： Laser Nitriding Surface patterning Titanium alloys Wear

White Noise in Quantum Random Walk Search Algorithm

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chinese Physics Letters 2006年第4期23卷 779-782页

作者：马雷杜江峰李筠李卉 KWEK L.c. Oh c.h. Department of Physics Faculty of Science National University of Singapore 10 Lower Kent Ridge Singapore 119260 Department of Physics East China Normal University Shanghai 200062 hefei National Laboratory for Physical Sciences at Microscale and Department of Modern Physics University of Science and Technology of China Hefei 230026 National Institute of Education Nanyang Technological University 1 Nanyang Walk Singapore 639798

The quantum random walk is a possible approach to construct new quantum search algorithms. It has been shown by Shenvi et al. [Phys. Rev. A 67（2003）52307] that a kind of algorithm can perform an oracle search on a database of N items with O（√N） calling to the oracle, yielding a speedup similar to other quantum search algorithms. We study the effect of white or Gaussian noise on this algorithm. The algorithm loses efficiency when noise is added. We also show that noise on the target state plays a more important role than that on other states. Finally we compare the effects of similar types of noise in the quantum random walk search algorithm and Grover＇s search algorithm.

关键词： White Noise Walk Search Algorithm

consolidation and dynamics of 3D unsaturated porous seabed under rigid caisson breakwater loaded by hydrostatic pressure and wave

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Science china(Technological Sciences) 2012年第8期55卷 2362-2376页

作者： YE Jianhong JENG DongSheng chan A h c Division of civil Engineering University of DundeeDundee DD14HNUK Department of civil Engineering University of BirminghamBirminghamB152TTUK

In this study,based on the dynamic Biot＇s theory ＂u-p＂ approximation,a 3D finite element method（FEM） numerical soil model is developed,in which the Generalized Newmark-β method is adopted to determine the time *** developed 3D FEM soil model is a part of the coupled model PORO-WSSI 3D for 3D wave-seabed-marine structures interaction problem,and is validated by the analytical solution proposed by Wang（2000） for a laterally infinite seabed loaded by a uniform *** adopting the developed 3D soil model,the consolidation of seabed under a caisson breakwater and hydrostatic pressure is *** numerical results show that the caisson breakwater built on seabed has very significant effect on the stresses/displacements fields in the seabed foundation after the transient deformation and primary consolidation are *** parametric study indicates that the Young＇s modulus E of seabed is the most important parameter to affect the settlement of breakwater,and the displacement fields in seabed *** the consolidation status as the initial condition,the interaction between ocean wave,caisson breakwater and seabed foundation is briefly *** 3D ocean wave is determined by solving the Navier-Stokes equations with finite volume method（FVM）.The numerical results indicate that there is intensive interaction between oceean wave, caisson breakwater and seabed foundation; and the breakwater indeed can effectively block the wave energy propagating to the coastline.

关键词： consolidation wave-seabed-breakwater interaction unsaturated seabed breakwater Biot's theory Navier-Stokes equation

Porphyrins and Phthalocyanines catalyzed Direct c--h Arylation

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chinese Journal of chemistry 2016年第10期34卷 955-961页

作者： ching Tat To Wu Yang Kin Shing chan Department of chemistry The Chinese University of Hong Kong Shatin New Territories Hong Kong China

catalytic direct functionalization of unreactive c--h bonds represents a sustainable and more atom economical transformation process. Porphyrin and pbthalocyanine derivatives show promising catalytic activities in direct c-- h arylation reactions. These reactions share a common c--c bond formation process via homolytic radical substi- tution. This review summarizes the catalytic direct c--h arylation reactions catalyzed by metalloporphyrins, free base porphyrins and free base phthalocyanines.

关键词： porphyrin phthalocyanine c--h arylation c--c coupling radical reaction

Transition metal oxides as hole-transporting materials in organic semiconductor and hybrid perovskite based solar cells

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Science china chemistry 2017年第4期60卷 472-489页

作者： Pingli Qin Qin he Dan Ouyang Guojia Fang Wallace c.h. choy Gang Li Department of Electronic and Information Engineering The Hong Kong Polytechnic University Hong Hum Kowloon Hong Kong SAR China School of Science Wuhan Institute of Technology Wuhan 430073 China college of Post and Telecommunications Wuhan Institute of Technology Wuhan 430073 China Key Laboratory of Artificial Micro- and Nano-struetures of the Ministry of Education School of Physics and Technology Wuhan University Wuhan 430072 China Department of Electrical and Electronic Engineering The University of Hong Kong Hong Kong SAR China

Organic polymer solar cells （OScs） and organic-inorganic.h.brid perovskite solar cells （PScs） have achieved notable progress over the past several years. A central topic in these fields is exploring electronically efficient, stable and effective hole-transporting layer （hTL） materials. The goal is to enhance hole-collection ability, reduce charge recombination, increase built-in voltage, and hence improve the performance as well as the device stability. Transition metal oxides （TMOs） semiconductors such as NiOx, cuOx, crOx, MoOx, WO3, and V2O5, have been widely used as hTLs in OScs. These TMOs are naturally adopted into PSc as hTLs and shows their importance. There are similarities, and also differences in applying TMOs in these two types of main solution processed solar cells. This concise review is on the recent developments of transition metal oxide hTL in OScs and PScs. The paper starts from the discussion of the cation valence and electronic structure of the transition metal oxide materials, followed by analyzing the structure-property relationships of these hTLs, which we attempt to give a systematic introduction about the influences of their cation valence, electronic structure, work ftmction and film property on device performance.

关键词： hole-transporting layer transition metal oxide perovskite solar cell organic solar cell

Machine learning prediction of magnetic properties of Fe-based metallic glasses considering glass forming ability

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Journal of Materials Science & Technology 2022年第8期103卷 113-120页

作者： Xin Li Guangcun Shan c.h.Shek School of Instrumentation Science and Opto-electronics Engineering Beihang UniversityBeijing 100191China Department of Materials Science and Engineering City University of Hong KongKowloon TongHong Kong SARChina

Fe-based metallic glasses(MGs)have shown great commercial values due to their excellent soft magnetic *** prediction with consideration of glass forming ability(GFA)is of great signifi-cance for developing novel functional Fe-based ***,theories or models established based on condensed matter physics exhibit limited accuracy and some *** this work,based on 618 Fe-based MGs samples collected from published works,machine learning(ML)models were well trained to predict saturated magnetization(B_(s))of Fe-based *** was treated as a feature using the experimental data of the supercooled liquid region(△T_(x)).Three ML algorithms,namely eXtreme gradient boosting(XGBoost),artificial neural networks(ANN)and random forest(RF),were *** feature selection and hyperparameter tuning,XGBoost showed the best predictive performance on the randomly split test dataset with determination coefficient(R^(2))of 0.942,mean absolute percent error(MAPE)of 5.563%,and root mean squared error(RMSE)of 0.078 T.A variety of feature importance rankings derived by XGBoost models showed that T_(x) played an important role in the predictive performance of the *** work showed the proposed ML method can simultaneously aggregate GFA and other features in ther-modynamics,kinetics and structures to predict the magnetic properties of Fe-based MGs with excellent accuracy.

关键词： Metallic glasses Soft magnetic properties Glass forming ability Machine learning Non-linear regression