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Highly sensitive detection of mercury（Ⅱ） ions with few-layer molybdenum disulfide

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Nano Research 2015年第1期8卷 257-262页

作者： Shan Jiang Rui cheng Rita ng Yu Huang Xiangfeng Duan Department of Chemistry and Biochemistry University of California Los Angeles California 90095 USA Department of Materials Science and Engineering University of California Los Angeles California 90095 USA California Nanosystems Institute University of California Los Angeles California 90095 USA

Two-dimensional （2D） layered transition metal dichalcogenide （TMD） materials （e.g., MoS2） have attracted considerable interest due to their atomically thin geometry and semiconducting electronic properties. With ultrahigh surface to volume ratio, the electronic properties of these atomically thin semiconductors can be readily modulated by their environment. Here we report an investigation of the effects of mercury（II）（Hg^2＋） ions on the electrical transport properties of few-layer molybdenum disulfide （MoS2）. The interaction between Hg^2＋ ions and few-layer MoS2 was studied by field-effect transistor measurements and photoluminescence. Due to a high binding affinity between Hg2. ions and the sulfur sites on the surface of MoS2 layers, Hg^2＋ ions can strongly bind to MoS2. We show that the binding of Hg^2＋ can produce a p-type doping effect to reduce the electron concentration in n-type few-layer MoS2. It can thus effectively modulate the electron transport and photoluminescence properties in few-layer MoS2. By monitoring the conductance change of few-layer MoS2 in varying concentration Hg2~ solutions, we further show that few-layer MoS2 transistors can function as highly sensitive sensors for rapid electrical detection of Hg^2＋ ion with a detection limit of 30 pM.

关键词： molybdenum disulfide 2D layered materials mercury doping effect sensors

MULTI-FACILITY ORDERED MEDIAN PROBLEMS IN DIRECTED NETWORKS

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Journal of Systems Science & Complexity 2011年第1期24卷 61-67页

作者： Huajun TAng T. C. Edwin cheng C. T. ng Faculty of Management and Administration Macao University of Science and Technology Macao China Department of Logistics and Maritime Studies The Hong Kong Polytechnic University Hong Kong China

This paper uses a finite dominating set （FDS） to investigate the multi-facility ordered median problem （OMP） in a strongly connected directed network. The authors first prove that the multi-facility OMP has an FDS in the node set, which not only generalizes the FDS result provided by Kalcsics, et al. （2002）, but also extends the FDS result from the single-facility Case to the multiple case, filling an important gap. Then, based on this FDS result, the authors develop an exact algorithm to solve the problem. However, if the number of facilities is large, it is not practical to find the optimal solution, because the multi-facility OMP in directed networks is NP-hard. Hence, we present a constant-approximation algorithm for the p-median problem in directed networks. Finally, we pose an open problem for future research.

关键词： Algorithms finite dominating sets multi-facility ordered median problem pseudoequilibria.

Advances of machine learning in materials science: Ideas and techniques

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Frontiers of physics 2024年第1期19卷 155-194页

作者： Sue Sin Chong Yi Sheng ng Hui-Qiong Wang Jin-cheng Zheng Department of New Energy Science and Engineering Xiamen University MalaysiaSepang 43900Malaysia Engineering Research Center of Micro-nano Optoelectronic Materials and Devices Ministry of EducationFujian Key Laboratory of Semiconductor Materials and ApplicationsCI Center for OSEDand Department of PhysicsXiamen UniversityXiamen 361005China

In this big data era, the use of large dataset in conjunction with machine learning (ML) has been increasingly popular in both industry and academia. In recent times, the field of materials science is also undergoing a big data revolution, with large database and repositories appearing everywhere. Traditionally, materials science is a trial-and-error field, in both the computational and experimental departments. With the advent of machine learning-based techniques, there has been a paradigm shift: materials can now be screened quickly using ML models and even generated based on materials with similar properties;ML has also quietly infiltrated many sub-disciplinary under materials science. However, ML remains relatively new to the field and is expanding its wing quickly. There are a plethora of readily-available big data architectures and abundance of ML models and software;The call to integrate all these elements in a comprehensive research procedure is becoming an important direction of material science research. In this review, we attempt to provide an introduction and reference of ML to materials scientists, covering as much as possible the commonly used methods and applications, and discussing the future possibilities.

关键词： machine learning materials science

Achalasia combined with esophageal intramural hematoma:Case report and literature review

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World Journal of Gastroenterology 2010年第42期16卷 5391-5394页

作者： Yin-Yi Chu Kai-Feng Sung Soh-Ching ng Hao-Tsai cheng cheng-Tang Chiu Division of Gastroenterology Department of Internal MedicineShin Kong Wu Ho-Su Memorial HospitalTaipei 111TaiwanChina Department of Gastroenterology and Hepatology Chang Gung Memorial HospitalChang Gung University College of MedicineKweishanTaoyuan 333TaiwanChina Department of Gastroenterology and Hepatology Chang Gung Memorial HospitalChang Gung University College of Medicine KweishanTaoyuan 333TaiwanChina Department of Internal Medicine Chang Gung Memorial HospitalChang Gung University College of MedicineKeelung 204TaiwanChina

A 62-year-old male patient was admitted to our hospital due to severe chest pain,odynophagia,and *** computed tomography showed an esophageal submucosal ***(EGD) revealed a longitudinal purplish bulging tumor of the *** ultrasound(EUS) showed a mixed echoic tumor with partial liquefaction from the submucosal *** patient was diagnosed with esophageal intramural hematoma as well as achalasia by upper gastrointestinal endoscopy,esophagography and esophageal *** patient was managed conservatively with intravenous nutrition,and oral feeding was ***-up EGD and EUS showed complete recovery of the esophageal wall,and finally,the patient underwent endoscopic dilatation for *** patient was symptom free at the time when we wrote this manuscript.

关键词： Esophageal intramural hematoma Achalasia Endoscopic ultrasound

Application of an amphipathic molecule at the NiO_(x)/perovskite interface for improving the efficiency and long-term stability of the inverted perovskite solar cells

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Journal of Energy Chemistry 2023年第3期78卷 454-462,I0013页

作者： Guibin Shen Hongye Dong Fan Yang Xin Ren ng Xin Li Fen Lin cheng Mu Key Laboratory of Advanced Light Conversion Materials and Biophotonics Department of ChemistryRenmin University of ChinaBeijing 100872China Solar Energy Research Institute of Singapore(SERIS) National University of SingaporeSingapore 117574Singapore State Key Laboratory of Materials Processing and Die&Mold Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074HubeiChina Department of Chemistry National University of Singapore3 Science Drive 3Singapore 117574Singapore

The presence of defects and detrimental reactions at NiO_(x)/perovskite interface extremely limit the efficiency performance and long-term stability of the perovskite solar cells(PSCs) based on NiO_(x).Herein,an amphipathic molecule Triton X100(Triton) is modified on the NiO_(x)*** hydrophilic chain of Triton as a Lewis base additive can coordinate with the Ni3+on the NiO_(x)surface which can passivate the interfacial defects and hinder the detrimental reactions at the NiO_(x)/perovskite ***,the hydrophobic chain of Triton protrudes from the NiO_(x)surface to prevent moisture from penetrating into the NiO_(x)/perovskite ***,the NiO_(x)/Triton-based devices(MAPbI3as absorbing layer) show superior moisture and thermal stability,retaining 88.4% and 64.3% of the initial power conversion efficiency after storage in air(40%-50% relative humidity(RH)) at 25 ℃ for 1070 h and in N2at 85℃ for 800 h,***,the efficiency increases from 17.59% to 19.89% because of the passivation defect and enhanced hole-extraction ***,the NiO_(x)/Triton-based PSCs with Cs_(0.05)(MA_(0.15)FA_(0.85))_(0.95)Pb(I_(0.85)Br_(0.15))3perovskite as the light-absorbing layer also exhibits better moisture and thermal stability compared to the control devices,indicating the viability of our *** particular note,a champion PCE of 22.35% and 20.46% was achieved for small-area(0.1 cm^(2)) and large-area(1.2 cm^(2)) NiO_(x)/Triton-based devices,respectively.

关键词： Perovskite solar cells NiO_(x) Defect passivation Long-term stability Amphipathic molecule

Reproductive medicine gets a new tool

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Journal of Molecular Cell Biology 2011年第6期3卷 320-321页

作者： Wei-Xia Ang cheng-Xu Delon Toh Huck-Hui ng Yuin-Han Loh Epigenetics and Cell Fates Laboratory A*STAR Institute of Medical BiologySingapore 138648Singapore NUS Graduate School for Integrative Sciences and Engineering Singapore 117597Singapore Department of Biological Sciences National University of SingaporeSingapore 117543Singapore Gene Regulation Laboratory Genome Institute of SingaporeSingapore 138672Singapore Department of Biochemistry National University of SingaporeSingapore 117597Singapore School of Biological Sciences Nanyang Technological UniversitySingapore 639798Singapore

Infertility is a problem faced by millions *** a recent paper published in Cell,Hayashi et al.(2011)provided a potential solution for male infertility through the generation of functional spermatozoa that can give ris... 详细信息

关键词： infertility offspring

Human Ebola virus infection in West Africa: a review of available therapeutic agents that target different steps of the life cycle of Ebola virus

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Infectious Diseases of Poverty 2014年第1期3卷 397-413页

作者： Kang Yiu Lai Wing Yiu George ng Fan Fanny cheng Department of Intensive Care Queen Elizabeth HospitalHKSARB630 Gascoigne RdKowloonHong Kong SARChina Department of Medicine Queen Elizabeth HospitalHKSARKowloonHong Kong SAR China

The recent outbreak of the human Zaire ebolavirus(EBOV)epidemic is spiraling out of control in West *** EBOV hemorrhagic fever has a case fatality rate of up to 90%.The EBOV is classified as a biosafety level 4 pathogen and is considered a category A agent of bioterrorism by Centers for Disease Control and Prevention,with no approved therapies and vaccines available for its treatment apart from supportive *** several promising therapeutic agents and vaccines against EBOV are undergoing the Phase I human trial,the current epidemic might be outpacing the speed at which drugs and vaccines can be *** all viruses,the EBOV largely relies on host cell factors and physiological processes for its entry,replication,and *** have reviewed currently available therapeutic agents that have been shown to be effective in suppressing the proliferation of the EBOV in cell cultures or animal *** of the therapeutic agents in this review are directed against non-mutable targets of the host,which is independent of viral *** medications are approved by the Food and Drug Administration(FDA)for the treatment of other *** are available and stockpileable for immediate *** may also have a complementary role to those therapeutic agents under development that are directed against the mutable targets of the EBOV.

关键词： Ebola virus Non-mutable host cell therapeutic targets for Ebola virus Cocktail therapeutic intervention for RNA virus

Economic analysis in product design——A case study of a TCM dietary supplement

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Chinese Journal of Chemical Engineering 2016年第1期24卷 202-214页

作者： Yuen Shan cheng Ka Yip Fung Ka Ming ng Christianto Wibowo Department of Chemical and Biomolecular Engineering The Hong Kong University of Science and Technology ClearWaterBay Technology Inc.

An approach for the economic analysis of chemical product design is proposed. It takes into account of customers' preference on product quality and economic considerations such as pricing, profit, market share, capital investment, and operating cost. The activities needed to support business decision making – identifying product quality, estimating product cost, calculating financial metrics, and performing make–buy analysis – are *** design of a Ganoderma lucidum dietary supplement, a traditional Chinese medicinal(TCM) product, is used to illustrate all the activities in this approach.

关键词： Product design Product conceptualization TCM dietary supplement Economic analysis Make–buy analysis

Dual Phase Renewable Fuel Combustion in an Atmospheric Gas Turbine Burner

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Journal of Thermal Science 2023年第3期32卷 1278-1291页

作者： AGWU Ogbonnaya RUNYON Jon GOKTEPE Burak CHOng TUng cheng ng Jo-Han GILES Anthony VALERA-MEDINA Agustin School of Engineering Cardiff UniversityWales CF243AAUK China-UK Low Carbon College Shanghai Jiao Tong UniversityLin'gang 201306China Faculty of Engineering and Physical Sciences University of Southampton MalaysiaIskandar Puteri 79100Malaysia

Expanding the fuel flexibility of continuous combustion systems to include multiphase fuel combustion offers additional support to combat the problem of energy security and,potentially,environmental *** this study,apart from establishing stability limits and measuring post-combustion emissions,flames generated from simultaneous combustion of biodiesel and syngas were examined using C_(2)*and CH*chemiluminescence imaging to capture changes in the reaction *** proportion of syngas in the fuel mix was varied from 0 to 30%content(by energy contribution)while maintaining a total power output of 15 *** overall equivalence ratio was held at 0.7 in cases other than for determining the flammability *** results indicate a reduction of stability limits as gas proportion in fuel blend ***,chemiluminescence imaging of the two targeted species suggest a general reduction in reaction rate as well as reaction zone area and length with increase in gas ratio in the dual phase ***,emissions performance in the context of NOxand CO was investigated as liquid-to-gas ratios were ***,the study demonstrates the feasibility,limitations and potential benefits of multiphase renewable fuel combustion in a swirl-stabilised burner.

关键词： dual fuel gas turbine multiphase combustion