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Atomscopic of ripple origins for two-dimensional monolayer transition metal dichalcogenides

Nano Research 2024年第3期17卷 2136-2144页

作者： Haitao Yu Mingzi Sun Xiao Wu cheuk hei chan Bolong Huang Zhong Lin Wang CAS Center for Excellence in Nanoscience Beijing Institute of Nanoenergy and NanosystemsChinese Academy of SciencesBeijing 100083China School of Nanoscience and Technology University of Chinese Academy of SciencesBeijing 100049China Department of Applied Biology and Chemical Technology The Hong Kong Polytechnic UniversityKowloon 999077Hong KongChina Research Centre for Carbon-Strategic Catalysis The Hong Kong Polytechnic UniversityKowloon 999077Hong KongChina School of Materials Science and Engineering Georgia Institute of TechnologyAtlantaGeorgia 30332USA

During the development of ultrathin two-dimensional(2D)materials,the appearance of ripples has been widely ***,the formation mechanisms and their influences are still rarely investigated,especially their contributions to the electronic structures and optical *** compensate for the knowledge gap,we have carried out comprehensive theoretical studies on the monolayer WSe_(2) with a series of ripple structures from 0 to 12Åin different lattice *** sensitivity of the formation energy,band structures,electronic structures,and optical properties to the ripple structures have been performed systematically for the first *** formation of ripples in Armchair and zigzag simultaneously are more energetically favorable,leading to more flexible optimizations of the optoelectronic *** improved charge-locking effect and extension of absorption ranges indicate the significant role of ripple *** spontaneous formation of ripples is associated with orbital rearrangements and structural *** leads to the unique charge carrier correlate inversion between W-5d and Se-4p orbitals,resulting in the pinning of the Fermi *** work has supplied significant references to understand ultrathin 2D structures and benefit their future developments and applications in high-performance optoelectronic devices.

关键词： two-dimensional(2D)materials ripples strain effect charge carrier correlation inversion optoelectronic properties

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Neighboring effect in single-atom catalysts for the electrochemical carbon dioxide reduction reaction

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eScience 2024年第1期4卷 1-16页

作者： Hon Ho Wong Mingzi Sun Tong Wu cheuk hei chan Lu Lu Qiuyang Lu Baian Chen Bolong Huang Department of Applied Biology and Chemical Technology The Hong Kong Polytechnic UniversityHung HomKowloonHong Kong SARChina Research Centre for Carbon-Strategic Catalysis The Hong Kong Polytechnic UniversityHung HomKowloonHong Kong SARChina

Although single-atom catalysts(SACs)have attracted enormous attention for their applications in the electrochemical reduction of CO_(2)(CO_(2)RR)due to their extraordinary catalytic activity and well-defined active centers,neighboring effects and their influence on the electrochemical performance of SACs have not been well *** this review,we present a summary of the neighboring effects on SACs for the CO_(2)RR process,where the surrounding atoms not only induce electronic modulation of the metal atom but also participate in the CO_(2)*** theoretical and experimental studies have pointed out that the neighboring sites of the anchored metal center can provide second active/adsorption locations during the catalytic process,enhancing CO_(2)RR performance *** review supplies advanced insights into the significant roles and impacts of neighboring effects on the catalytic process,which also benefit the development of advanced SACs to achieve efficient electrocatalysis.

关键词： Carbon dioxide reduction Neighboring effect Atomic catalysts Electronic modulations Active sites

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Ensemble Wind Power Prediction Interval with Optimal Reserve Requirement

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Journal of Modern Power Systems and Clean Energy 2024年第1期12卷 65-76页

作者： Hamid Rezaie cheuk hei Chung Nima Safari the Saskatchewan Power Corporation(SaskPower) ReginaSaskatchewanCanada the Department of Electrical and Computer Engineering and Department of Human Biology University of TorontoTorontoON M5S 3G4Canada the Alberta Electric System Operator(AESO) CalgaryAlbertaCanada

Wind power prediction interval(WPPI)models in the literature have predominantly been developed for and tested on specific case ***,wind behavior and characteristics can vary significantly across ***,a prediction model that performs well in one case might underperform in *** address this shortcoming,this paper proposes an ensemble WPPI framework that integrates multiple WPPI models with distinct characteristics to improve *** important and often overlooked factor is the role of probabilistic wind power prediction(WPP)in quantifying wind power uncertainty,which should be handled by operating *** reserve in WPPI frameworks enhances the efficacy of *** this regard,the proposed framework employs a novel bi-layer optimization approach that takes both WPPI quality and reserve requirements into *** analysis with different real-world datasets and various benchmark models validates the quality of the obtained WPPIs while resulting in more optimal reserve requirements.

关键词： Ensemble model linear programming operating reserve optimal reserve requirement prediction interval probabilistic prediction renewable integration uncertainty representation wind power prediction(WPP)

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Distribution of a Certain Partition Function Modulo Powers of Primes

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Acta Mathematica Sinica,English Series 2011年第4期27卷 625-634页

作者： hei-Chi chan Department of Mathematical Sciences University of Illinois at Springfield Springfield IL 62703-5407 USA

In this paper, we study a certain partition function a（n） defined by ∑n≥0 a（n）qn ：= ∏n=1（1- qn）-1（1 -2n）-1. We prove that given a positive integer j 〉 1 and a prime m _〉 5, there are infinitely many congruences of the type a（An ＋ B） ≡ 0 （rood m3）. This work is inspired by Ono＇s ground breaking result in the study of the distribution of the partition function p（n）.

关键词： Distribution of partition function Ono's theorem Ramanujan's congruences

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Raw Materials of Chinese Traditional Handmade paper

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Paper And Biomaterials 2023年第3期8卷 58-65页

作者： cheuk Kei chan Xiaohui Yi School of History University of Chinese Academy of Social SciencesBeijing100102China National Library of China Beijing100081China

Chinese traditional handmade papers,due to their numerous names,have been misunderstood by the public about raw materials for a long *** manuscript aims to introduce the raw materials of traditional Chinese handmade paper in a botanical aspect in chronological *** handmade paper’s raw materials are divided into two groups,bast fiber and grass *** fiber paper includes ramie-made rag paper,mulberry and paper mulberry paper,Thymelaeaceae paper,and vine *** and grass fiber paper includes bamboo paper,grass paper,and stalk paper.

关键词： handmade paper raw materials bast fiber paper bamboo paper

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Nanotechnology for diagnosis and therapy of theumatoid arthritis:Evolution towards theranostic approaches

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Chinese Chemical Letters 2021年第1期32卷 66-86页

作者： Junkai Zhao Xuan Chen Kwun-hei Ho Chao Cai cheuk-Wing Li Mo Yang changqing Yi Guangdong Provincial Key Laboratory of Sensor Technology and Biomedical Instrument School of Biomedical EngineeringSun Yat-sen UniversityShenzhen 518107China Department of Biomedical Engineering the Hong Kong Polytechnic UniversityHong KongChina School of Science and Technology Nottingham Trent UniversityClifton LaneNottinghamNG118NSUnited Kingdom

Rheumatoid arthritis(RA),as a chronic autoimmune disease,damages the bone and cartilage of patients,and even leads to ***,the diagnosis and treatment of RA is particularly ***,due to the complexity of RA,it is difficult to make effective early diagnosis of RA,which is detrimental to RA ***,long-term intake of anti-RA drugs can also cause damage to patients' *** emergence of nanotechnology provides the new train of thoughts for the diagnosis and treatment of *** the combination of diagnosis and therapy is an ideal method to solve the problem of disease management of RA *** this review,we summarize the mechanism and microenvironment of RA,discuss the commonly used diagnostic techniques and therapeutic drugs for RA,and review their advantages and *** nanotherapy strategies such as drug-carrying nanoparticles,PTT,PDT are listed,and their applications in RA treatment are also *** addition,multimodal imaging,combined therapy and responsive diagnosis and treatment are also summarized as important *** last,we also review typical nanocarriers that can be used in the integration of diagnosis and therapy,and discussed their potential applications in RA theranostics.

关键词： Rheumatoid arthritis Diagnosis Therapy Theranostics Nanomedicine

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My mother is looking blue

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World Journal of Emergency Medicine 2019年第4期10卷 251-252页

作者： Howard Tat Chun chan Anselm Wang hei Hui Colin Graham Joseph Walline Department of Accident and Emergency Medicine Hong Kong Hospital AuthorityPrince of Wales HospitalShatinHong KongChina Accident and Emergency Medicine Academic Unit The Chinese University of Hong KongPrince of Wales HospitalShatinHong KongChina

Dear editor,A 76-year-old Chinese female presented by ambulance to the Emergency Department complaining of dizziness,headache and *** son claimed that the patient“turned blue”three hours prior to onset of the patient’s *** noted the patient’s SpO2 was 83%on room air with no improvement with a nonrebreather *** medical history was signifi cant for diabetes and ***,social and medication history were non-contributory.

关键词： mother looking blue Emergency Department

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Risk Perception and Knowledge in Fire Risk Reduction in a Dong Minority Rural Village in China: A Health-EDRM Education Intervention Study

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International Journal of Disaster Risk Science 2018年第3期9卷 306-318页

作者： Emily Ying Yang chan Holly Ching Yu Lam Phoebe Pui Wun Chung Zhe Huang Tony Ka Chun Yung Kelvin Wai Kit Ling Gloria Kwong Wai chan cheuk Pong Chiu Collaborating Centre for Oxford University and CUHK for Disaster and Medical Humanitarian Response (CCOUC) The Chinese University of Hong Kong Nuffield Department of Medicine University of Oxford The Jockey Club School of Public Health and Primary Care The Chinese University of Hong Kong Franois-Xavier Bagnoud Center for Health and Human Rights Harvard University Integrated Research on Disaster Risk (IRDR) International Centre of Excellence–CCOUC (ICoE-CCOUC)

Fire is one of the major disasters in rural communities but evidence of the effectiveness of education interventions against fire risks is limited. This was a 2-year study assessed the effectiveness of face-to-face Health Emergency and Disaster Risk Management(HealthEDRM) education interventions for raising fire risk reduction knowledge in a fire-prone rural ethnic minority community. The study was conducted in various pre-set time points of an intervention-based project in a Dongbased community in Nanjiang Village, Guizhou Province in 2015 and 2016 to increase knowledge among the villagers about how to reduce general-and electrical-fire risks. Pre-and post-intervention questionnaires were used to evaluate the effectiveness of increasing fire risk-related knowledge through these interventions, immediately after the 2015 and 2016 interventions, and 17 months after the 2015 intervention. The knowledge of using fire blanket,recalling the correct emergency telephone number,unplugging unused electrical appliances, and not using water to extinguish electrical fires had immediately improved after the interventions. Subjects demonstrated a better understanding that fire blankets can fight a blaze if used appropriately, and that knowledge was sustained for 17 months. The interventions were effective in improving fire prevention and response knowledge. Targeted interventions should be organized according to communities' culture, the evolution of economic prosperity and lifestyle practices.

关键词： Dong village Fire risk education Fire risk perception Fire risk reduction Health education Rural China Health-EDRM

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Recent Unusual Consecutive Spring Tropical Cyclones in North Atlantic and Winter Oceanic Precursor Signals

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Journal of Meteorological Research 2023年第2期37卷 208-217页

作者： Hong HUANG Jeremy cheuk-Hin LEUNG Johnny CLchan Jimin LIU Weihong QIAN Banglin ZHANG College of Meteorology and Oceanography National University of Defense TechnologyChangsha410015 Guangzhou Institute of Tropical and Marine Meteorology/Guangdong Provincial Key Laboratory of Regional Numerical Weather Prediction China Meteorological AdministrationGuangzhou510640 School of Energy and Environment City University of Hong KongHong Kong999077 Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai519082 College of Atmospheric Sciences Lanzhou UniversityLanzhou730000 Shanghai Typhoon Institute China Meteorological AdministrationShanghai 200030 Asia-Pacific Typhoon Collaborative Research Center Shanghai201306 Department of Atmospheric and Oceanic Sciences Peking UniversityBeijing100871

Although the North Atlantic(NA)hurricane season has been reported to start increasingly early,historical longterm changes in NA spring tropical cyclone(TC)activity have not been examined in previous *** find that spring TCs have become more frequent and intense,and they have more closely approached the US coastline over the past four decades,thus increasing the probability of landfall.A long-term increase in the NA sea surface temperature(SST)and northward incursion of warm water may be responsible for the increasing number,intensity,and northward shift of spring *** addition,the interdecadal winter NA SST tripole mode may induce a North Atlantic Oscillation(NAO)-like atmospheric response in the following spring,which controls spring TC tracks via modulating the strength and position of the NA subtropical high(or the Bermuda high).The superposition of the interdecadal positive winter SST tripole on the NA warming trend has contributed to the anomalous enhancement and northward shift of spring TC activity,increasing the spring TC risks in the US in the past six years.

关键词： hurricane climate change spring tropical cyclone preseason storm

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Long-term clinical outcomes of drug-eluting stents ***-metal stents in Chinese geriatric patients

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Journal of Geriatric Cardiology 2013年第4期10卷 330-335页

作者： Pak-hei chan Sha-Sha Liu Hung-Fat Tse Wing-Hing Chow Man-Hong Jim Hee-Hwa HO Chung Wah Siu Department of Medicine Li Ka Shing Faculty of Medicine The University of Hong Kong 102 Pokfulam Rd Hong Kong China Cardiac Medical Unit Grantham Hospital 125 Wong Chuk Hang Rd Aberdeen Hong Kong China

BACKGROUND & OBJECTIVE: Little is known about the relative efficacies of percutaneous coronary intervention (PCI) with drug-eluting stents (DES) and bare-metal stents (BMS) in elderly patients。 The objective of this study was to evaluate the clinical outcome for geriatric patients who received either DES or BMS。 METHODS: From January 2002 to October 2005, 199 consecutive Chinese geriatric patients (≥ 75 years old) underwent PCI with coronary DES or BMS implantation at our institution。 We analyzed the major clinical end points that included all-cause mortality, cardiovascular death, myocardial infarction, target lesion revascularization (TLR), stent thrombosis, and bleeding complications。 RESULTS: The three-year cumulative rates of all-cause mortality, cardiovascular death, and myocardial infarction were significantly lower in the DES group (6.3%,3.6%,5.4%) compared with the BMS group (16.2%,11.5%,14.9%; P <0.05)。 No significant differences were found in the three-year cumulative rate for target lesion revascularization (6.3% vs4.6%, P =0.61) or stent thrombosis (3.6% vs2.3%, P =0.70)。 Likewise, there were no statistically significant differences in the cumulative rate for intracranial hemorrhage, or major and minor hemorrhage at three years。 CONCLUSIONS: DES-based PCI was associated with a significant reduction in the three-year cumulative rate of all-cause mortality, cardiovascular death, and myocardial infarction compared with BMS, without increased risk of TLR, stent thrombosis, or bleeding complications at three years in this group of Chinese geriatric patients。

关键词： Bare-metal stents Drug-eluting stents Geriatric patients Percutaneous coronary intervention

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