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Surface charge transfer doping for two-dimensional semiconductor-based electronic and optoelectronic devices

Nano Research 2021年第6期14卷 1682-1697页

作者： Yanan Wang yue zheng Cheng Han Wei Chen Department of Physics National University of SingaporeSingapore117542Singapore SZU-NUS Collaborative Innovation Center for Optoelectronic Science&Technology International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of EducationInstitute of Microscale OptoelectronicsShenzhen UniversityShenzhen518060China Department of Chemistry National University of SingaporeSingapore117543Singapore Joint School of National University of Singapore and Tianjin University International Campus of Tianjin UniversityBinhai New CityFuzhou350207China National University of Singapore(Suzhou)Research Institute Suzhou215123China

Doping of semiconductors,i.e.,accurately modulating the charge carrier type and concentration in a controllable manner,is a key technology foundation for modern electronics and ***,the conventional doping technologies widely utilized in silicon industry,such as ion implantation and thermal diffusion,always fail when applied to two-dimensional(2D)materials with atomically-thin *** charge transfer doping(SCTD)is emerging as an effective and non-destructive doping technique to provide reliable doping capability for 2D materials,in particular 2D ***,we summarize the recent advances and developments on the SCTD of 2D semiconductors and its application in electronic and optoelectronic *** underlying mechanism of STCD processes on 2D semiconductors is briefly *** impact on tuning the fundamental properties of various 2D systems is *** particularly emphasize on the SCTD-enabled high-performance 2D functional ***,the challenges and opportunities for the future development of SCTD are discussed.

关键词： surface charge transfer doping two-dimensional(2D)semiconductors property modulation electronic devices optoelectronic devices

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Hierarchical cluster-tendency analysis of the group structure in the foreign exchange market

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Frontiers of physics 2013年第4期8卷 451-460页

作者： Xin-Ye Wu Zhi-gang zheng Department of Physics and the Beijing-Hong Kong Singapore Joint Center for Nonlinear and Complex Systems Beijing Normal University Beijing 100875 China

A hierarchical cluster-tendency （HCT） method in analyzing the group structure of networks of the global foreign exchange （FX） market is proposed by combining the advantages of both the minimal spanning tree （MST） and the hierarchical tree （HT）. Fifty currencies of the top 50 World GDP in 2010 according to World Bank＇s database are chosen as the underlying system. By using the HCT method, all nodes in the FX market network can be ＂colored＂ and distinguished. We reveal that the FX networks can be divided into two groups, i.e., the Asia-Pacific group and the Pan-European group. The results given by the hierarchical cluster-tendency method agree well with the formerly observed geographical aggregation behavior in the FX market. Moreover, an oil-resource aggregation phenomenon is discovered by using our method. We find that gold could be a better numeraire for the weekly-frequency FX data.

关键词： foreign-exchange market hiergrchical cluster-tendency method hierarchical tree,minimum spanning tree

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Using Improved Particle Swarm Optimization Algorithm for Location Problem of Drone Logistics Hub

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Computers, Materials & Continua 2024年第1期78卷 935-957页

作者： Li zheng gang Xu Wenbin Chen School of Mathematics and Computer Sciences Nanchang UniversityNanchang330031China

Drone logistics is a novel method of distribution that will become *** advantageous location of the logistics hub enables quicker customer deliveries and lower fuel consumption,resulting in cost savings for the company’s transportation *** firms must discern the ideal location for establishing a logistics hub,which is challenging due to the simplicity of existing models and the intricate delivery *** simulate the drone logistics environment,this study presents a new mathematical *** model not only retains the aspects of the current models,but also considers the degree of transportation difficulty from the logistics hub to the village,the capacity of drones for transportation,and the distribution of logistics hub ***,this paper proposes an improved particle swarm optimization(PSO)algorithm which is a diversity-based hybrid PSO(DHPSO)algorithm to solve this *** DHPSO,the Gaussian random walk can enhance global search in the model space,while the bubble-net attacking strategy can speed ***,Archimedes spiral strategy is employed to overcome the local optima trap in the model and improve the exploitation of the *** maintains a balance between exploration and exploitation while better defining the distribution of logistics hub locations Numerical experiments show that the newly proposed model always achieves better locations than the current *** DHPSO with other state-of-the-art intelligent algorithms,the efficiency of the scheme can be improved by 42.58%.This means that logistics companies can reduce distribution costs and consumers can enjoy a more enjoyable shopping experience by using DHPSO’s location *** the results show the location of the drone logistics hub is solved by DHPSO effectively.

关键词： Drone logistics location problem mathematical model diversity particle swarm optimization

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ACTIVATABLE SMART PROBES FOR MOLECULAR OPTICAL IMAGING AND THERAPY

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Journal of Innovative Optical Health Sciences 2008年第1期1卷 45-61页

作者： JONATHAN F.LOVELL gang zheng Institute of Biomaterials and Biomedical Engineering Department of Medical Biophysics University of Toronto Division of Biophysics and Bioimaging Ontario Cancer Institute TorontoOntario M5G 1L7Canada

Recent years have seen the design and implementation of many optical activatable smart *** probes are activatable because they change their optical properties and are smart because they can identify specific *** broad class of detection agents has allowed previously unperformed visualizations,facilitating the study of diverse biomolecules including enzymes,nucleic acids,ions and reactive oxygen *** to be robust in an in vivo environment,these probes have been used in tissue culture cells and in live small *** emerging class of smart probes has been designed to harness the potency of singlet oxygen generating *** the discrimination of activatable agents with the toxicity of photosensitizers represents a new and powerful approach to disease *** review highlights some applications of activatable smart probes with a focus on developments of the past decade.

关键词： Optical imaging photodynamic therapy activatable imaging probes

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Radiative Decay Bc → Ds*γ in the Technicolor with a Massless Scalar Doublet Model

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Communications in Theoretical Physics 2002年第7期38卷 47-52页

作者： CAO Yi-gang JIAO zheng-Kuan Department of Physics Zhejiang University Hangzhou 310027 China Department of Physics Zhejiang University Hangzhou 310027 China

Applying perturbative QCD, we study the process Bc → Dsγ in the technicolor with a massless scalar doublet model (TCMLSM). There are mainly two mechanisms contributing to the Bc → D*sγ process. One proceeds through the short distance b → sγ transition and the other through weak annihilation accompanied by a photon *** find that, compared with the standard model, the modification of Bc → D*sγ from πρ (the physical pions in the TCMLSM) is so small that can be neglected for the allowed mass ofπρ. The weak-annihilation contribution is found to be about one order larger than that of the electromagnetic penguin diagrams.

关键词： perturbative QCD, technicolor, massless scalar doublet model

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Propagation dynamics on the Fermi-Pasta-Ulam lattices

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Frontiers of physics 2013年第3期8卷 349-355页

作者： Zong-Qiang Yuan Zhi-gang zheng Department of Physics and the Beijing Hong Kong-Singapore Joint Centre for Nonlinear and Complex Systems (Beijing) Beijing Normal University Beijing 100875 China

The spatiotemporal propagation of a momentum excitation on the finite Fermi-Pasta-Ulam lattices is investigated. The competition between the solitary wave and phonons gives rise to interesting propagation behaviors. For a moderate nonlinearity, the initially excited pulse may propagate co- herently along the lattice for a long time in a solitary wave manner accompanied by phonon tails. The lifetime of the long-transient propagation state exhibits a sensitivity to the nonlinear parameter. The solitary wave decays exponentially during the final loss of stability, and the decay rate varying with the nonlinear parameter exhibits two different scaling laws. This decay is found to be related to the largest Lyapunov exponent of the corresponding Hamiltonian system, which manifests a transition from weak to strong chaos. The mean-free-path of the solitary waves is estimated in the strong chaos regime, which may be helpful to understand the origin of anomalous conductivity in the Fermi-Pasta Ulam lattice.

关键词： Fermi-Past-Ulam model solitary wave low-dimensional heat conduction

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Effects of surface energy and substrate on modulus determination of biological films by conical indentation

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Science China(Technological Sciences) 2024年第6期67卷 1757-1764页

作者： DING yue LI Cheng-Ya NIU XinRui WANG gang-Feng Department of Engineering Mechanics SVLXi’an Jiaotong UniversityXi’an710049China Department of Mechanical Engineering City University of Hong KongHong Kong SAR999077China

Micro-/nano-indentation has become prevalent in evaluating the mechanical characteristics of biological samples,such as cells and ***,the existing contact models describing conical indentation ignore the joint effects of surface energy and substrate,and consequently cannot accurately extract the Young's modulus of biological samples deposited on *** finite element methods,we examine the conical indentation of biological films on substrates while taking surface energy into *** on the dimensional analysis,the explicit relationship between load and indentation depth is achieved for films with their moduli varying from 0.001 to 100 times that of the *** the classical Sneddon's model was employed to analyze the load-depth data,the measured modulus could reach 18 times the real modulus for films on harder substrates,but only 4%of the real modulus for films on softer ***,in micro-/nano-indentations,neglecting the contribution of surface energy would result in an overestimation of the Young's modulus of films depending on the contact *** analytical expression provided here can be utilized to precisely deduce the mechanical characteristics of biological films deposited on substrate from the load and indentation depth data of a conical indentation.

关键词： biological film surface effect substrate effect indentation

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SOLUTION OF A KIND OF LINEAR INTERNAL WAVE EQUATION

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Journal of Hydrodynamics 2005年第5期17卷 636-640页

作者： WANG gang HOU Yi-jun zheng Quan-an Institute of Oceanology Chinese Academy of Sciences Qingdao 266071 China Graduate School of the Chinese Academy of Sciences Beijing 100039 China Department of Meteorology University of Maryland Maryland 20742-2425 USA

Considering the effect of horizontal Coriolis parameter and the density compactness of seawater, which were often neglected in internal waves discussion, the governing equation of linear internal waves presented by vertical velocity only will be proposed. Under the assumption that the Brunt- Vaeisaelae frequency is exponential, an accurate analytic solution of it is obtained. Finally, the expressions of wave functions are also given.

关键词： internal wave Boussinesq approximation,Coriolis parameter Brunt-Vaeisaelae frequency

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A Semilinear Elliptic Equation with Double Resonance

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Acta Mathematica Sinica,English Series 2011年第7期27卷 1233-1246页

作者： Mei yue JIANG Ming zheng SUN LMAM School of Mathematical Sciences Peking University Beijing 100871 P. R. China College of Sciences North China University of Technology Beijing 100144 P. R. China

In this paper, the existence and multiplicity of a class of double resonant semilineax elliptic equations with the Dirichlet boundary value axe studied.

关键词： Semilinear elliptic equation double resonance

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北重楼根的化学成分研究

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中南药学 2018年第3期16卷 297-300页

作者：唐娜刘杨李岳洋陆云阳邵青岳正刚汤海峰宋小妹陕西中医药大学药学院陕西咸阳712046 第四军医大学药物研究所西安710032

目的研究北重楼(Paris verticillata)根中的化学成分。方法利用正相硅胶柱色谱、中低压制备色谱仪、反相硅胶柱色谱、Sephadex LH-20凝胶柱色谱、制备高效液相色谱等分离方法从北重楼根部70%乙醇提取液的正丁醇萃取物中分离得到单体化合... 详细信息

目的研究北重楼(Paris verticillata)根中的化学成分。方法利用正相硅胶柱色谱、中低压制备色谱仪、反相硅胶柱色谱、Sephadex LH-20凝胶柱色谱、制备高效液相色谱等分离方法从北重楼根部70%乙醇提取液的正丁醇萃取物中分离得到单体化合物,根据其理化性质及现代波谱技术鉴定其结构。结果从北重楼中分离得到2个甾体皂苷和4个甾酮类化合物,分别鉴定为:偏诺皂苷元-3-O-α-L-吡喃鼠李糖基-(1→2)-[α-L-吡喃鼠李糖基-(1→4)]-β-D-吡喃葡萄糖苷(1)、重楼皂苷Ⅶ(2)、2-去氧甲壳甾酮(3)、5-hydroxyabutastorone(4)、2-deoxyintegristerone A(5)、integristerone A(6)。结论化合物4~6为首次从重楼属植物中分离。

关键词：北重楼皂苷成分蜕皮甾酮结构鉴定

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