检索结果-南通市图书馆

Nano Research 2021年第11期14卷 3773-3794页

作者： yong Xu Muhan Cao Shaoming huang Guangzhou Key Laboratory of Low-Dimensional Materials and Energy Storage Devices Collaborative Innovation Center of Advanced Energy MaterialsSchool of Materials and EnergyGuangdong University of TechnologyGuangzhou510006China Institute of Functional Nano&Soft Materials(FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials and DevicesSoochow UniversitySuzhou215123China

Metal halide perovskite nanocrystals have attracted great attention of researchers due to their unique optoelectronic properties such as high photoluminescence quantum yield (PLQY), narrow full width at half-maximum (FWHM), long exciton diffusion length and high carrier mobility, which have been widely used in diverse fields including solar cells, photodetectors, light-emitting diodes, and lasers. Very recently, metal halide perovskites have emerged as a new class of materials in photocatalysis due to their promising photocatalytic performance. In this review, we summarize the recent advances on synthesis, modification and functionalization, with a specific focus on the photocatalytic application of metal halide perovskite nanocrystals. Finally, a brief outlook is proposed to point out the challenges in this emerging area. The goal of this view is to introduce the photocatalytic application of the metal halide perovskites and motivate researchers from different fields to explore more potentials in catalysis.

关键词： metal halide perovskite nanocrystals synthesis modification functionalization photocatalytic application

Three-stage alloying of[Ag_(44)(p-MBA)_(30)]^(4−)cluster with[Au_(2)(p-NTP)_(2)Cl]^(−)

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2022年第8期15卷 7742-7751页

作者： Baoyu huang Xiaomei Zhao yong Pei Department of Chemistry Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of EducationKey Laboratory for Green Organic Synthesis and Application of Hunan ProvinceXiangtan UniversityXiangtan 411105China

Precise control of alloying sites has long been a challenge,yet little has been achieved in the atomic-level manipulation of metallic *** study reported a three-stage metal and motif exchange mechanism of alloying reaction of an atomically precise ligand-protected[Ag_(44)(p-MBA)_(30)]^(4−)(p-MBA=para-mercaptobenzoic acid)cluster with[Au_(2)(p-NTP)_(2)Cl]^(−)(p-MBA=para-mercaptobenzoic acid).During the first stage(Stage I),an exchange of ligand-shell metal atoms took *** the second stage(Stage II),the motif exchanged on the[AuAg_(43)(p-MBA)_(30)]^(4−)*** the third stage(Stage III),the Au(I)atom in the ligand-shell was swapped with a Ag(0)atom of the icosahedral *** density functional theory(DFT)calculation results demonstrated that the metal exchange proceeded via different mechanisms at the different reaction *** reaction Stages I and II,the metal exchange proceeded via formation of a dianionic[Ag_(44)(p-MBA)_(30)]^(4−)-[Au_(2)(p-NTP)_(2)Cl]^(−)intermediate and then broke and recombined with the *** Stage III,the diffusion of the Au(I)to icosahedral Ag12-core(Stage III)was proceeded via a motif catalyzed heterometal atom diffusion *** hope that this work will provide a new perspective for the precise control of alloy position in alloyed nanomaterials.

关键词： metal cluster alloying mechanism density functional theory(DFT)calculations metal exchange

Two-Dimensional DOA Estimation Using One-Dimensional Search for Spherical Arrays

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Electronics 2019年第6期28卷 1259-1264页

作者： huang Qinghua FENG Jiajun FANG yong Key Laboratory of Specialty Fiber Optics and Optical Access Networks Shanghai University

A Reduced-dimensional spherical harmonics MUSIC(RD-SHMUSIC) is proposed to solve the problem of high computational complexity of Multiple signal classification(MUSIC) algorithm for Twodimensional(2-D) Direction of arrival(DOA) *** proposed algorithm first expresses the spherical harmonic steering vector as a linear weight of a uniform phase vectors. Via the Lagrange multiplier method, we can get a new search function to estimate elevations. At second step, the algorithm expresses the steering vector in another form, a linear weight of a vector which is constructed by associated Legendre functions. A search function to estimate azimuths can also be *** proposed method only needs One dimensional(1-D) angle search, which means it has a large reduction of computational complexity compared to the traditional Spherical harmonics MUSIC(SHMUSIC). The simulation results show that the accuracy of the proposed method is better than Two-stage decoupled approach(TSDA)algorithm, and has close performance to that of SHMUSIC.

关键词： Direction of arrival estimation Spherical arrays Reduced-dimensional spherical harmonics MUSIC Computational complexity

Spacecraft Doppler tracking with possible violations of LLI and LPI:upper bounds from one-way measurements on MEX

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2015年第10期15卷 1751-1757页

作者： Yi Xie yong huang School of Astronomy and Space Science Nanjing University Shanghai Key Laboratory of Space Navigation and Position Techniques Key Laboratory of Modern Astronomy and Astrophysics Nanjing UniversityMinistry of Education Shanghai Astronomical Observatory Chinese Academy of Sciences

We analyze the post-fit residuals of one-way Doppler tracking data from the Mars Express （MEX） spacecraft to test possible violations of local Lorentz invariance （LLI） and local position invariance （LPI）. These one-way Doppler observations were carried out on 2011 August 7 for about 20 minutes at Sheshan Station of Shanghai Astronomical Observatory in China. These downlink signals were sent by MEX for telemetry at X-band. Because we are not able to decode the data in the form of teleme- try and separate them from the carrier frequency, this makes the post-fit residuals of the Doppler data degrade to the level of 0.1 m s^-1. Even so, the residuals can still impose upper bounds on LLI and LPI at 10^-1, which is consistent with the prediction based on our analysis of the detectability. Although the upper bounds given by three-way Doppler tracking of MEX are better than those obtained in the present work, one-way Doppler measurements still provide a unique chance to test possible violations of LLI and LPI far from the ground stations.

关键词： space vehicles -- techniques: radial velocities -- gravitation

Shape and gravitational field of the ellipsoidal satellites

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2014年第10期57卷 2015-2020页

作者： GAO BuXi huang yong Institute of Geodesy and Geophysics Chinese Academy of Sciences Physics Department School of Science Wuhan University of Technology

The shape and gravitational field of ellipsoidal satellites are studied by using the tidal theory. For ellipsoidal satellites, the following conclusions were obtained: Firstly, in the early stage of the satellite formation, strong tidal friction allowed the satellites move in a synchronous orbit and evolve into a triaxial ellipsoidal shape. Because the tidal potential from the associated primary and the centrifugal potential from the satellite spin are nearly fixed at the surface, the early satellites are the viscoelastic celestial body, and their surfaces are nearly in the hydrostatic equilibrium state. The deformation is fixed in the surface of the satellite. By using the related parameters of primary and satellite, the tidal height and the theoretical lengths of three primary radii of the ellipsoidal satellite are calculated. Secondly, the current ellipsoidal satellites nearly maintain their ellipsoidal shape from solidification, which happened a few billion years ago. According to the satellite shape, we estimated the orbital period and spinning angular velocity, and then determined the evolution of the orbit. Lastly, assuming an ellipsoidal satellite originated in the hydrostatic equilibrium state, the surface shape could be determined by tidal, rotation, and additional potentials. However, the shape of the satellite's geoid differs from its surface shape. The relationship between these shapes is discussed and a formula for the gravitational harmonic coefficients is presented.

关键词： eliipsoidal satellites hydrostatic equilibrium secular love number shape tidal height

One new species and two new records of free-living marine nematodes from the huanghai Sea

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2005年第4期24卷 91-97页

作者： ZHANG Zhinan huang yong College of Marine Life Sciences Ocean University of China Qingdao 266003 China Agricultural College Liaocheng University Liaocheng 232000 China

One new species of free-living marine nematode of the genus Curvolaimus, Curvolaimus filiformis sp. nov. from the huanghai Sea is described and illustrated. This new species is characterized by the buccal cavity teeth, large amphids and two ventral seta at the conical part of tail. Meanwhile, two new records of genus Halalaimus, Halalaimus longicaudatus and H. isaitshikovi are fast reported in China. Types are deposited in the College of Marine Life Sciences, Ocean University of China.

关键词： flee-living marine nematode new species new record huanghai Sea

Relay node selection and combination ratio for amplify-and-forward OFDM-UWB communication

在线全文

学校读者我要写书评

暂无评论

The Journal of China Universities of Posts and Telecommunications 2015年第3期22卷 41-48页

作者： Guo yong huang Liang School of Electronics and Information Engineering Beijing Jiaotong University

Due to its large bandwidth and the complexity of indoor environment, the ultra-wideband （UWB） channel is frequency selective, which affects the data rate and reliability of UWB communication. This paper investigates amplify-and-forward （AF） relay scheme to mitigate this reliability problem for orthogonal frequency division multiplexing （OFDM）-UWB communication. The relay can be used to acquire capacity gain and diversity gain just like multiple-input and multiple-output （MIMO） system. The first investigation focuses on the relay-node selection criterion and combination ratio for capacity gain. Capacity gain depends on the correlation of frequency responses between direct link and relay link in addition to signal-to-noise ratio （SNR） of relay link. Increased similarity of the two frequency responses increases capacity gain. Capacity gain＇s best relay and combination ratio are found by taking the derivative of the capacity equation. Solution of the quadratic derivative equation of ratio finds the optimal ratios for every potential relay node. The second investigation focuses on relay-node selection criterion and combination ratio for diversity gain. Higher diversity gain corresponds to less deep-faded sub-channels of combined signal. Reduced computation divides the problem into two steps： the first step selects the relay node according to the criterion that is dependent on the expectation value and variance of S（f）--the function of SNR of Jq the second step solves the optimization problem for optimal combination ratio. Numerical simulation shows that our scheme is effective in pursuit of capacity gain and of diversity gain.

关键词： cooperative system amplify-and-forward relay selection combination ratio OFDM Ultra-wideband communication

A new free-living marine nematode species of Rhinema from the South China Sea

在线全文

学校读者我要写书评

暂无评论

Journal of Oceanology and Limnology 2020年第2期38卷 545-549页

作者： ZHAI Hongxiu huang Mian huang yong College of Life Sciences Liaocheng UniversityLiaocheng 252059China Department of Marine Organism Taxonomy and Phylogeny Institute of OceanologyChinese Academy of SciencesQingdao 266071China University of Chinese Academy of Sciences Beijing 100049China

A new free-living marine nematode species of the genus Rhinema belonging to the family Monoposthiidae was collected from marine sediments in the Qiongzhou Strait of the South China Sea,and it is described here as Rhinema longispicula *** new species is characterized by coarsely annulated cuticle with 12 longitudinal ridges(alae)marked as reversed *** first and second annuli broader and form a kind of a cephalic *** amphideal fovea circular,situated in the middle of the broad second annulus,not surrounded by dense *** cavity cylindrical with a large dorsal *** with a prominent anterior pharyngeal bulb and an elongated terminal *** spicules strongly curved,with cephalated proximal end and pointed distal *** boat-shaped,without apophysis.A long and blunt precloacal seta *** with two opposed,outstretched ovaries.

关键词： Rhinema longispicula sp.nov. free-living marine nematode taxonomy

Stochastic stability of viscoelastic system under non-Gaussian colored noise excitation

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2012年第3期55卷 483-492页

作者： yong huang XianBin Liu Nanjing Univ Aeronaut & Astronaut State Key Lab Mech & Control Mech Struct Nanjing 210016 Jiangsu Peoples R China

This article examines a viscoelastic plate that is driven parametrically by a non-Guassian colored noise,which is simplified to an Ornstein-Uhlenbeck process based on the approximation *** examine the moment stability property of the viscoelastic system,we use the stochastic averaging method,Girsanov theorem and Feynmann-Kac formula to derive the approximate analytic expansion of the moment Lyapunov ***,the Monte Carlo simulation results for the original system are given to check the accuracy of the approximate analytic *** the end of this paper,results are presented to show some quantitative pictures of the effects of the system parameters,noise parameters and viscoelastic parameters on the stability of the viscoelastic plate.

关键词： viscoelastic system the moment Lyapunov exponents non-Gaussian colored noise stochastic averaging method the Monte Carlo simulation

One new species of free-living marine nematodes (Enoplida,Anticomidae,Cephalanticoma) from the huanghai Sea

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2007年第3期26卷 84-89页

作者： huang yong ZHANG Zhinan College of Marine Life Sciences Ocean University of China Qingdao 266003 China College of Life Sciences Liaocheng University Liaocheng 252000 China

One new species of free-living marine nematodes Cephalanticomafilicaudata sp. nov. from the huanghai Sea, China is described and illustrated. Cephalanticomafilicaudata sp. nov. is characterized by well developed cephalic capsule, three teeth at the anterior of oesophagus, excretory pore opens posterior to cervical setae, only two cervical setae per file, body length longer than 5 200 μm, tail long and no ventral-lateral seta between the supplement and the cloacal opening. Types are deposited in the College of Marine Life Sciences, Ocean University of China.

关键词： marine nematode new species huanghai Sea