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Polarization-Insensitive All-Optical Time-Division Demultiplexer Constructed with a Nonlinear Loop Interferometer

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光学学报 2003年第S1期23卷 589-590页

作者： T.k. Liang C.S. Wong h.k. tsang C. Shu The Chinese University of hong kong Department of Electronic Engineering Hong Kong ChinaThe Chinese University of Hong Kong Department of Electronic Engineering Hong Kong ChinaThe Chinese University of Hong Kong Department of Electronic Engineering Hong Kong ChinaThe Chinese University of Hong Kong Department of Electronic Engineering Hong Kong China

A polarization-insensitive 40-Gb/s time-division demultiplexer was demonstrated in a polarization-diversity loop configuration. The power penalty was measured to be 2.3 dB at a bit error rates of 10-9 for 10 Gb/s outp... 详细信息

关键词： OTDM et in Polarization-Insensitive All-Optical Time-Division Demultiplexer Constructed with a Nonlinear Loop Interferometer UNI were FWhM BERT length of with

Controllable optical emission wavelength in all-inorganic halide perovskite alloy microplates grown by two-step chemical vapor deposition

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Nano Research 2020年第11期13卷 2939-2949页

作者： Mohammad k.hossain Pengfei Guo Wayesh Qarony Yuen h.tsang Chaoping Liu Sai W.tsang Johnny C.ho kin M.Yu Department of Physics City University of Hong KongKowloonHong Kong SARChina Department of Physics Comilla UniversityKotbariCumilla3506Bangladesh Department of Materials Science and Engineering City University of Hong KongKowloonHong Kong SARChina Department of Applied Physics The Hong Kong Polytechnic UniversityHung HomKowloonHong Kong SARChina College of Physics and Optoelectronics Taiyuan University of TechnologyTaiyuan030024China Research Center for Advanced Optics and Photoelectronics Department of PhysicsCollege of ScienceShantou UniversityShantou515063China key Laboratory of Intelligent Manufacturing Technology of MOE Shantou UniversityShantou515063China

All-inorganic halide perovskites(IhP),CsPbX_(3)(X=Cl,Br,I)exhibiting efficient optical emissions within the spectral range of 410 to 730 nm are potential candidates for many optoelectronic *** alloying of these IhPs is expected to achieve tunable emission wavelength covering the entire visible ***,we developed a two-step chemical vapor deposition(CVD)process for growing quaternary IhP CsPbX_(3)(X=Cl/Br and Br/I)*** exploiting the fast diffusion of halide anions in IhPs,the alloy composition can be precisely controlled by the growth time of the respective layers once the growth of the individual ternary IhP is *** complexities in the multi-parameter optimization in the conventional CVD growth of quaternary alloys can be *** this process,we synthesized single crystalline,homogeneous and thermally stable CsPbCl3_((1−X))Br_(3x)and CsPbBr3_((1−X))I_(3x)perovskites alloy microplates and demonstrated continuously tunable emission covering the spectrum from 428 to 715 nm by varying the halide compositions in the *** alloy microplates also exhibit room temperature amplified spontaneous emissions(ASE)along with strong photonic discharges from the microplate’s edges and hence are potentially useful as a gain medium as well as optical cavities for emissions with wavelengths covering the visible spectrum.

关键词： chemical vapor deposition inorganic perovskites quaternary alloys emission spectrum amplified spontaneous emissions(ASE)

DEPICT:A high-level Formal Language for Modeling Constraint Satisfaction Problems

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International Journal of Automation and computing 2008年第2期5卷 208-216页

作者： Abdulwahed M.Abbas Edward P.k.tsang Ahmad h.Nasri Department of Computer Science The University of Balamand Department of Computing and Electronic SystemsThe University of EssexDepartment of Computer ScienceThe American University of BeirutP.O.Box 100TripoliLebanonWivenhoe ParkColchester CO4 3SQUKP.O.Box:11-0236Riad EI-SolhBeirutLebanon

The past decade witnessed rapid development of constraint satisfaction technologies, where algorithms are now able to cope with larger and harder problems. however, owing to the fact that constraints are inherently declarative, attention is quickly turning toward developing high-level programming languages within which such problems can be modeled and also solved. Along these lines, this paper presents DEPICT, the language. Its use is illustrated through modeling a number of benchmark examples. The paper continues with a description of a prototype system within which such models may be interpreted. The paper concludes with a description of a sample run of this interpreter showing how a problem modeled as such is typically solved.

关键词： Constraint satisfaction problems (CSPs) and languages formal specifications typed predicate calculus language interpreter

Reflective graphene oxide absorber for passively mode-locked laser operating at nearly 1μm

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Chinese Physics B 2013年第9期22卷 442-445页

作者：杨济民杨琦刘杰王勇刚 Yuen h.tsang College of Physics and Electronics Shandong Normal University State key laboratory of Crystal Material Shandong University Department of Applied Physics and Materials Research Center The Hong Kong Polytechnic University

A low cost and simply fabricated reflective graphene oxide is successfully made. By using this absorber, as well as an end reflector, we obtain a passively mode-locked Yb：LuYSiO5 laser operating at nearly 1 p,m. When the pump power is increased up to 5.73 W, stable mode locking is achieved. The central wavelength of the laser spectrum is 1043.2 nm with a pulse duration of 5.0 ps. When the pump power reaches 8.16 W, dual-wavelength mode locking laser pulses at 1036.3 nm and 1043.5 nm are simultaneously detected.

关键词： passively mode-locked dual-wavelength laser graphene oxide Yb:LuYSi05 crystal

A study of different annealing schedules in SARNA-predict A permutation based SA algorithm for RNA folding

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International Journal of Intelligent Computing and Cybernetics 2015年第2期8卷 152-171页

作者： herbert h.tsang kay C.Wiese Applied Research Lab Trinity Western UniversityLangleyCanada School of Computing Science Simon Fraser UniversitySurreyCanada

Purpose–The purpose of this paper is to present a study of the effect of different types of annealing schedules for a ribonucleic acid(RNA)secondary structure prediction algorithm based on simulated annealing(SA).Design/methodology/approach–An RNA folding algorithm was implemented that assembles the final structure from potential substructures(helixes).Structures are encoded as a permutation of *** SA searches this space of *** and annealing schedules were studied and fine-tuned to optimize algorithm ***–In comparing with mfold,the SA algorithm shows comparable results(in terms of F-measure)even with a less sophisticated thermodynamic *** terms of average specificity,the SA algorithm has provided surpassing *** limitations/implications–Most of the underlying thermodynamic models are too simplistic and incomplete to accurately model the free energy for larger *** is the largest limitation of free energy-based RNA folding algorithms in *** implications–The algorithm offers a different approach that can be used in practice to fold RNA sequences ***/value–The algorithm is one of only two SA-based RNA folding *** authors use a very different encoding,based on permutation of candidate *** in depth study of annealing schedules and other parameters makes the algorithm a strong *** benefit is that new thermodynamic models can be incorporated with relative ease(which is not the case for algorithms based on dynamic programming).

关键词： Annealing schedule Simulated annealing RNA secondary structure prediction Ribonucleic acid RNA folding Permutation

All-Optical Wavelength Conversion with Amplitude Equalization and Pulse Shaping

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光学学报 2003年第S1期23卷 491-492页

作者： C.W.Chow C.S.Wong h.k.tsang Department of Electronic Engineering The Chinese University of Hong Kong Shatin Hong Kong ChinaDepartment of Electronic Engineering The Chinese University of Hong Kong Shatin Hong Kong ChinaDepartment of Electronic Engineering The Chinese University of Hong Kong Shatin Hong Kong China

A dual-wavelength-injection-locked (DWIL) Fabry-Perot (FP) laser is used as an all-optical wavelength converter and regenerator. Regenerated pulses have narrower pulse-width of 37ps. Power penalty and extinction-ratio... 详细信息

关键词： EDFA on in as of mode FP All-Optical Wavelength Conversion with Amplitude Equalization and Pulse Shaping with dBm

Pulse Generation by Mode-Beating in a Dual-Wavelength Injection-Locked Laser

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光学学报 2003年第S1期23卷 -页

Generating of repetition-rate tunable optical pulses is achieved by mode-beating within a CW-operated Fabry-Perot laser. The repetition-rate was tunable from 6Ghz to 32Ghz and may be synchronized by a low frequency (5... 详细信息

关键词： mode on as by Pulse Generation by Mode-Beating in a Dual-Wavelength Injection-Locked Laser FP in

Candida albicans aspects of binary titanium alloys for biomedical applications

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Regenerative Biomaterials 2020年第2期7卷 213-220页

作者： Shuyang Chen James k.h.Tsoi Peter C.S.tsang Yeong-Joon Park ho-Jun Song Jukka P.Matinlinna Dental Materials Science Division of Applied Oral Sciences&Community Dental CareFaculty of DentistryThe University of Hong KongPrince Philip Dental Hospital34 Hospital RoadHong Kong SARPeople’s Republic of China Department of Prosthodontics Tianjin Stomatological HospitalNo.75Dagu RoadHeping DistrictTianjin 300041People’s Republic of China Division of Restorative Dental Sciences Faculty of DentistryThe University of Hong KongPrince Philip Dental Hospital34 Hospital RoadHong Kong SARPeople’s Republic of China and 4 Department of Dental Materials and MRC for hard-tissue Biointerface School of DentistryChonnam National UniversityGwangju 61186Republic of Korea

Titanium and its alloys are widely used in biomedical devices,***,due to its biocompati-bility and osseointegration *** fact,fungal(Candida spp.)infection has been identified as one of the key reasons causing the failure of the device that is inevitable and impactful to the ***,this study evaluated the surface morphology,surface chemical composition and Candida albicans adhesion on specimens of 16 binary Tialloys(-5 wt%of any one of the alloy elements:Ag,AI,Au,Co,Cr,Cu,Fe,In,Mn,Mo,Nb,Pd,Pt,Sn,V and Zr)compared with cp-Ti,targeting to seek for the binary Ti-alloys which has the lowest *** *** albicans cultures were grown on the specimens for 48 h,and colony forming units(CFUs)and real-time polymerase chain reaction(RT-PCR)were used to evaluate the biofilm formation *** electron mi-croscopy and confocal laser scanning microscopy confirmed the formation of *** biofilm on all specimens'surfaces,such that CFU results showed Ti-Mo,Ti-Zr,Ti-AI and Ti-V have less *** formed on the surfaces than ***-PCR showed Ti-Zr and Ti-Cu have significantly higher *** DNA concentrations than Ti-AI and Ti-V(Phereas Ti-Cu has even showed a statistically higher concentration than Ti-Au,Ti-Co,Ti-In and Ti-Pt(Phis study confirmed that Ti-Mo,Ti-Zr,Ti-AI and Ti-V have lower the occurrence of *** which might be clinically advantageous for medical devices,but Ti-Cu should be used in caution.

关键词： titanium binary titanium alloy C.albicans,fungal infection medical devices