检索结果-南通市图书馆

Joint compressed sensing imaging and phase adjustment via an iterative method for multistatic passive radar

在线全文

学校读者我要写书评

暂无评论

Frontiers of Information Technology & Electronic Engineering 2018年第4期19卷 557-568页

作者： jue wang Jun wang National Laboratory of Radar Signal Processing Xidian University

The resolution of the multistatic passive radar imaging system(MPRIS)is poor due to the narrow bandwidth of the signal transmitted by illuminators of ***,the inaccuracies caused by the inaccurate tracking system or the error position measurement of illuminators or receivers can deteriorate the quality of an *** improve the performance of an MPRIS,an imaging method based on the tomographic imaging principle is *** the compressed sensing technique is extended to the MPRIS to realize high-resolution ***,a phase correction technique is developed for compensating for phase errors in an *** errors can be estimated by iteratively solving an equation that is derived by minimizing the mean recovery error of the reconstructed image based on the principle of fixed-point iteration *** technique is nonparametric and can be used to estimate phase errors of any *** effectiveness and convergence of the technique are confirmed by numerical simulations.

关键词： Multistatic passive radar Compressed sensing Phase adjustment Fixed-point iteration technique

Oxidation behavior of Ni-based superalloy GH738 in static air between 800 and 1000℃

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2021年第3期40卷 616-625页

作者： jue wang Hao Xue Ying wang Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology Nanjing 211167China School of Materials Science and Engineering Nanjing Institute of TechnologyNanjing 211167China

The oxidation behavior of a nickel-based superalloy GH738 was studied by isothermal oxidation tests in still air at different temperatures,with exposure time up to 100 ***-kinetic curves were plotted using the mass gain *** surface and cross-sectional morphologies were observed by scanning electron microscopy(SEM).A composition analysis and an oxidation-product identification were conducted using energydispersive X-ray spectroscopy(EDS) and an X-ray diffraction(XRD),*** results showed that GH738 exhibited parabolic oxidation-kinetic curves,with stable parabolic-rate constants at each *** activation energy of oxide growth was calculated to be329.6 kJ·mol^(-1).Cr_(2) O_(3)(chromia) was the external oxidation product at 800℃.A TiO_(2)-Cr_(2) O_(3) double-layer structure was formed at 900℃.The position of TiO_(2) changed from the oxide-metal interface to the air-oxide interface by the diffusion of Ti atoms in chromia during the oxidation time at this *** was observed in the Cr_(0.12)Ti_(0.78)O_(1.74)-Cr_(2) O_(3) multi-layer oxide of at 1000℃,which increased the oxidation *** all the tests,the main internal oxide was always Al_(2) O_(3).The entire GH738 oxidation process was interpreted by the competitive diffusion of elements(Cr,Ti,Ni,etc.) in metal matrix and chromia,while a schematic diagram of oxidation process was proposed.

关键词： GH738 Oxidation behavior Diffusion Multilayer structure

A FOURTH-ORDER COMPACT AND CONSERVATIVE DIFFERENCE SCHEME FOR THE GENERALIZED ROSENAU-KORTEWEG DE VRIES EQUATION IN TWO DIMENSIONS

在线全文

学校读者我要写书评

暂无评论

Journal of Computational Mathematics 2019年第4期37卷 541-555页

作者： jue wang Qingnan Zeng School of Science Harbin Engineering University Harbin 150001 China

In this paper, a conservative difference scheme for the Rosenau-Korteweg de Vries (RKdV) equation in 2D is proposed. The system satisfies the conservative laws in energy and mass. Existence and uniqueness of its difference solution have been shown. The order of O(τ^2 +/h^4) in the discrete L^∞-norm with time step τ and mesh size h is obtained. Some important lemmas are proposed to prove the high order convergence. We prove that the present scheme is unconditionally stable. Numerical results are also given in order to check the properties of analytical solution.

关键词： RKdV equation Conservation Exist ence Uniqueness St ability Convergence

Configurable Virtual MIMO via UAV Swarm:Channel Modeling and Spatial Correlation Analysis

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

China Communications 2022年第9期19卷 133-145页

作者： Jiachen Qian jue wang Shi Jin National Mobile Communications Research Laboratory Southeast UniversityNanjing 210096China School of Information Science and Technology Nantong UniversityNantong 226109China Nantong Research Institute for Advanced Communication Technologies Nantong 226109China

Air-to-ground wireless channel modeling for unmanned aerial vehicle(UAV)communications has been widely ***,channel modeling for UAV swarm-enabled cooperative communication still needs investigation,where the impact of UAV positions on the spatial channel characteristics is of particular *** this paper,we consider a UAV swarm-enabled virtual multiple input multiple output(MIMO)system,where multiple single-antenna UAVs cooperatively transmit to multiple ground users(GUs).We establish a common coordinate system,as well as a UAV swarm-oriented coordinate system,to describe the relative positions of the GUs and the UAV elements,*** on the established coordinate systems,geometric ray superposition method is applied to describe the spatial channel *** proposed modeling framework can be directly used to describe the line-of-sight and two-ray propagations,and can be extended for including more practical spatial features such as multipath scattering,inter-UAV blockage,and random UAV jittering,*** on the proposed model,we further analyze the spatial correlation among the virtual MIMO links of GUs located at different *** extensive simulations,we show that thanks to the flexible deployment of UAVs,the virtual MIMO array structure can be conveniently configured to get desired channel properties,such as the channel capacity,eigenvalue and condition number distribution,and spatial correlation *** shows the possibility and importance of exploiting a new design dimension,i.e.,the UAV swarm pattern,in such cooperative virtual MIMO systems.

关键词： UAV communications MIMO channel model spatical correlation

G protein-coupled receptors in energy homeostasis

在线全文

学校读者我要写书评

暂无评论

Science China(Life Sciences) 2014年第7期57卷 672-680页

作者： wang jue XIAO RuiPing Institute of Molecular Medicine Peking University

G-protein coupled receptors(GPCRs)compromise the largest membrane protein superfamily which play vital roles in physiological and pathophysiological processes including energy ***,they also represent the up-to-date most successful drug *** gut hormone GPCRs,such as glucagon receptor and GLP-1 receptor,have been intensively studied for their roles in metabolism and respective drugs have developed for the treatment of metabolic diseases such as type 2 diabetes(T2D).Along with the advances of biomedical research,more GPCRs have been found to play important roles in the regulation of energy homeostasis from nutrient sensing,appetite control to glucose and fatty acid metabolism with various *** investigation of their biological functions will not only improve our understanding of how our body keeps the balance of energy intake and expenditure,but also highlight the possible drug targets for the treatment of metabolic *** present review summarizes GPCRs involved in the energy control with special emphasis on their pathophysiological roles in metabolic diseases and hopefully triggers more intensive and systematic investigations in the field so that a comprehensive network control of energy homeostasis will be revealed,and better drugs will be developed in the foreseeable future.

关键词： G-protein coupled receptor energy homeostasis metabolism

Carbon foam with microporous structure for high performance symmetric potassium dual-ion capacitor

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2020年第4期29卷 129-138页

作者： Yanhong Feng Suhua Chen jue wang Bingan Lu School of Physics and Electronics Hunan UniversityChangsha 410082HunanChina State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan UniversityChangsha 410082HunanChina

A novel carbon foam with microporous structure(CFMS),with the advantages of a simple fabrication process,low energy consumption,large specific surface area and high conductivity,has been prepared by a facile one-step *** addition,the carbon foam possesses suitable interlayer spacing in short range which is flexible to accommodate the deformation of carbon layer caused by the ion insertion and deinsertion at the charge and discharge ***,a low cost carbon-based symmetric potassium dual-ion capacitor(PDIC),which integrates the virtues of potassium ion capacitors and dual-ion batteries,is successfully established with CFMS as both the battery-type cathode and the capacitor-type *** displays a superior rate performance,an ultra-long cycle life(90%retention after 10000 cycles),and a high power density of 7800 W kg^-1 at an energy density of 39Whkg^-*** PDIC also exhibits excellent ultrafast charge and slow discharge properties,with a full charge in just 60 s and a discharge time of more than 3000 s.

关键词： Carbon foam Symmetric potassium-based dual-ion capacitor High energy/power density Ultrafast charge and slow discharge

Probabilistic Model Checking-Based Survivability Analysis in Vehicle-to-Vehicle Networks

在线全文

学校读者我要写书评

暂无评论

China Communications 2018年第1期15卷 118-127页

作者： Li Jin Guoan Zhang jue wang School of Electronics and Information Nantong University

Probabilistic model checking has been widely applied to quantitative analysis of stochastic systems, e.g., analyzing the performance, reliability and survivability of computer and communication systems. In this paper, we extend the application of probabilistic model checking to the vehicle to vehicle(V2V) networks. We first develop a continuous-time Markov chain(CTMC) model for the considered V2V network, after that, the PRISM language is adopted to describe the CTMC model, and continuous-time stochastic logic is used to describe the objective survivability properties. In the analysis, two typical failures are considered, namely the node failure and the link failure, respectively induced by external malicious attacks on a target V2V node, and interrupt in a communication link. Considering these failures, their impacts on the network survivability are demonstrated. It is shown that with increasing failure strength, the network survivability is reduced. On the other hand, the network survivability can be improved with increasing repair rate. The proposed probabilistic model checking-based approach can be effectively used in survivability analysis for the V2V networks, moreover, it is anticipated that the approach can be conveniently extended to other networks.

关键词： V2V survivability analysis prob-abilistic model checking PRISM

Development of a simple two-step lithography fabrication process for resonant tunneling diode using air-bridge technology

在线全文

学校读者我要写书评

暂无评论

Journal of Semiconductors 2023年第11期44卷 79-82页

作者： Swagata Samanta jue wang Edward Wasige Department of Electronics and Communication Engineering SRM University-APAndhra PradeshIndia 2School of EngineeringUniversity of GlasgowGlasgow G128LTUK

This article reports on the development of a simple two-step lithography process for double barrier quantum well(DBQW)InGaAs/AlAs resonant tunneling diode(RTD)on a semi-insulating indium phosphide(InP)substrate using an air-bridge *** approach minimizes processing steps,and therefore the processing time as well as the required *** is particularly suited for material qualification of new epitaxial layer designs.A DC performance comparison between the proposed process and the conventional process shows approximately the same *** expect that this novel technique will aid in the recent and continuing rapid advances in RTD technology.

关键词： air-bridge indium phosphide microfabrication resonant tunneling diode

Effects of axial gap on aerodynamic force and response of shrouded and unshrouded blade

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2017年第4期60卷 491-500页

作者： JIANG JinPeng LI JiaWen CAI GuoBiao wang jue School of Astronautics Beihang University System Engineering Division China Academy of Launch Vehicle Technology

Forced response analysis of a rocket engine turbine blade was conducted by a decoupled fluid-structure interaction *** forces on the rotor blade were obtained using 3D unsteady flow simulations. The resulting aerodynamic forces were interpolated to the finite element(FE) model through surface effect elements prior to conducting forced response *** of axial gap on aerodynamic forces were studied. In addition, influence of axial gap on the response of the shrouded blade was compared with that on the response of the unshrouded blade. Results demonstrated that as the axial gap increases,time-averaged pressure on the blade surface changes very little, while the pressure fluctuations decrease significantly. Pressure and aerodynamic forces on the blade surface display periodic variation, and the vane passing frequency component is *** of aerodynamic forces decrease with increasing axial gap. Restricted by the shroud, deformation and response of shrouded blade are much lower than those of the unshrouded blade. The response of unshrouded blade shows obvious beat vibration phenomenon, while the response of the shrouded blade does not have this characteristic because the shroud restrains multiple harmonics. Blade response in time domain was converted to frequency domain using fast Fourier transformation(FFT).Results revealed that the axial gap mainly affects the forced harmonic at the vane passing frequency, while the other two harmonics at natural frequency are hardly affected. Amplitudes of the unshrouded blade response decrease as the axial gap increases, while amplitudes of the shrouded blade response change very little in comparison.

关键词： axial gap forced response shrouded blade unshrouded blade aerodynamic forces