检索结果-南通市图书馆

Preparation of a New Type of Multiqubit Entangled States in Cavity QED

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2008年第9期50卷 738-740页

作者： XIONG wen-Yuan WANG xin-wen XIA Li-xin Department of Electronic Engineering and Physics Hunan University of Science and Engineering Yongzhou 425100 China Department of Physics Beijing Normal University Beijing 100875 China Department of Physics Tsinghua University Beijing 100084 China

Recently Yang,Chu,and Han [***.A 70 (2004) 022329] presented a new type of multipartiteentangled states for implementing efficient many-party controlled teleportation of multiqubit quantum *** propose a simple scheme for preparing such a type of multi-atom entangled states in cavity quantum electrodynamics(QED).The scheme involves atom-cavity interaction with large detuning,and is immune to the cavity decay and thethermal field *** practical analyses show its availability with the present technology.

关键词： new type of entangledsates cavity QED controlled quantum communication

Quantum Teleportation via Hybrid Entangled States

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2007年第3X期48卷 441-444页

作者： XIONG wen-Yuan WANG xin-wen Department of Electronic Engineering and Physics Hunan University of Science and Engineering Yongzhou 425100China

In this paper, we study quantum teleportation of atomic states via a hybrid entangled state （HES） involving an atom and a cavity field. And we investigate how to implement controlled phase （CP） gates between atomic internal states and coherent states of cavity field. We also discuss the methods of distinguishing coherent states [±α〉 in a cavity. Finally, a brief discussion about the feasibility of this scheme in experiment is presented.

关键词： hybrid entangled states quantum teleportation controlled phase gates discrimination of cavityfield coherent states

Two-Parameter Stochastic Resonance in a Model of Electrodissolution of Fe in H_2SO_4

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2001年第3期12卷 223-226页

作者： Zong xin PI Hou wen xin Department of Chemical Physics University of Science and Technology of ChinaHefei 230026

Stochastic resonance (SR) is shown in a two-parameter system, a model of electrodissolution of Fe in H2SO4. Modulation of two different parameters by a periodic signal in one parameter and noise in the other parameter is found to give rise to SR. The result indicates that the noise can enlarge a weak periodic signal and lead the system to order. novel aspects of SR in this system are discussed.

关键词： Noise signal stochastic resonance

Research on Health Stage Division of Switch Machine Based on Bray-Curtis Distance and Fisher Optimal Segmentation Method

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Electronics 2023年第5期32卷 955-962页

作者： WU Xiaochun wen xin School of Automation and Electrical Engineering Lanzhou Jiaotong University

In order to reasonably and accurately evaluate the health status of the switch machine, a health stage division method of switch machine combining BrayCurtis distance and Fisher optimal segmentation is proposed. First, the power curve of switch machine is divided into five sections, and eight time-domain characteristic parameters of each section are extracted. Second, the characteristic parameters with the largest correlation between fifteen dimensions and state of the switch machine are selected by using the Holder coefficient method as the input of Bray-Curtis distance algorithm, using Bray-Curtis distance to calculate health index(HI), which represents health state of switch machine. Finally, HI curve is divided by Fisher optimal segmentation method,and the optimal number of health stages of switch machine is determined to be three, and HI interval and threshold of each health stage are obtained. The effectiveness of this method is verified by 4382 sets of on-site switch machine data experiments. The experimental results show that the health index curve calculated by BrayCurtis distance can accurately represent the health status of the switch machine. Compared with Frechet distance and European distance, this method has better performance in tendency, robustness, and runtime. Combining with Fisher optimal segmentation method, it can reasonably and effectively divide the health stage of the switch machine, providing some support for the on-site judgment of the health status of the switch machine.

关键词： Temperature distribution Uncertainty Runtime Europe Switches Interference Robustness

Theoretical Study of Haloacetonitrile Anions： CH2XCN^- （X=F, Cl）

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Physics 2008年第3期21卷 255-262页

作者： xin-wen Zhang Mei Li Shan-xi Tian Hefei National Laboratory for Physical Sciences at Microscale University of Science and Technologyof China Hefei 230025 China Department of Chemical Physics University of Science and Technology of China Hefei 230026China

Haloacetonitrile anions CH2XCN- （X=F, Cl） were studied by HF-SCF, Becke3-LYP, and MP2 methods together with the Dunning＇s basis set aug-cc-PVTZ. The vertical electron attachments to the neutral are endothermic. The geometrically optimized CH2FCN^- is mainly a valence-bounded anion and CH2FCN→CH2CN＋F^- is a nonadiabatic dissociation. This theoretical study in good agreement with the experimental results shows that the Becke3-LYP method is reasonable in describing the electronic structures of anions and dissociative attachment dynamics, while significant differences between MP2 and Becke3-LYP results are shown for the dissociation potential curves of CH2ClCN→CH2CN＋Cl^-.

关键词： Haloacetonitrile Electron attachment Dissociation dynamics Electron correlation effect

Four new orientation relationships of Mg_(17)Al_(12) phase with magnesium matrix in Mg-8Al-0.5Zn alloys

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

Journal of Magnesium and Alloys 2023年第12期11卷 4689-4695页

作者： Feiya Liu Renlong xin xin wen xinfu Gu Qing Liu Joint International Laboratory for Light Alloys(MOE) College of Materials Science and EngineeringChongqing UniversitySha Zheng Jie 174Sha Ping Ba District Chongqing 400044China National Engineering Research Center for Mg Alloys Chongqing UniversityChongqingChina School of Materials Science and Engineering University of Science and Technology BeijingBeijingChina Key Laboratory for Light-weight Materials Nanjing Tech UniversityNanjingChina

Although the non-basal precipitates, those not parallel to the basal plane, are more effective to block basal slip in Mg-Al alloys, the crystallographic orientation relationship(OR) between these precipitates and the α-Mg matrix has not been well established. In this work, the crystallography of the non-basal Mg_(17)Al_(12) precipitates in AZ80 alloy was systematically investigated by transmission electron microscopy(TEM). By tilting to a suitable electron beam direction, different kinds of non-basal precipitates were recognized in TEM, and the following four new ORs between the non-basal Mg_(17)Al_(12) precipitates and the matrix were revealed: ■, and ■.Furthermore, these ORs and their habit planes were explained using the edge-to-edge matching model. The findings in this work can provide some guidelines for designing the microstructure of Mg-Al alloys to enhance their precipitation hardening potential.

关键词： Mg alloys Precipitate Orientation relationship Crystallography Edge-to-edge matching model

Design of Fault Detection Observer Based on Hyper Basis Function

在线全文

学校读者我要写书评

暂无评论

Tsinghua Science and Technology 2015年第2期20卷 200-204页

作者： xin wen xingwang Zhang Yaping Zhu Faculty of Aerospace Engineering Shenyang Aerospace University College Astronautics Nanjing University of Aeronautics and Astronautics College Astronautics Nanjing University of Aeronautics and Astronautics

In this paper, we propose the Hyper Basis Function （HBF） neural network on the basis of Radial Basis Function （RBF） neural network. Compared with RBF, HBF neural networks have a more generalized ability with different activation functions. A decision tree algorithm is used to determine the network center. Subsequently, we design an adaptive observer based on HBF neural networks and propose a fault detection and diagnosis method based on the observer for the nonlinear modeling ability of the neural network. Finally, we apply this method to nonlinear systems. The sensitivity and stability of the observer for the failure of the nonlinear systems are proved by simulation, which is beneficial for real-time online fault detection and diagnosis.

关键词： observer fault detection hyper basis function neural networks

Dysphagia in a patient with ankylosing spondylitis:A case report

在线全文

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2021年第7期9卷 1639-1645页

作者： xin-wen Wang wen-Zhi Zhang Department of Orthopedics Provincial Hospital Affiliated to Anhui Medical UniversityHefei 230001Anhui ProvinceChina Spine Center Department of OrthopedicsProvincial Hospital Affiliated to Anhui Medical UniversityHefei 230001Anhui ProvinceChina

BACKGROUND Ankylosing spondylitis(AS)is a systematic and rheumatic disease,which causes multiple ***,dysphagia due to the formation of a giant anterior cervical osteophyte is rare in patients with *** SUMMARY We present the case of a 65-year-old male patient who was diagnosed with AS and visited the hospital with a complaint of progressive *** appropriate imaging examinations indicated that a giant anterior cervical osteophyte at C3-4 caused esophageal compression,which led to *** operation for resection was performed without *** This case demonstrates that a large cervical osteophyte may be the cause of dysphagia in patients with AS,and early accurate diagnosis and surgical treatment are very important for the improvement of *** cervical discectomy and fusion are extremely effective and should be taken into consideration.

关键词： Ankylosing spondylitis Dysphagia Giant osteophyte Cervical spine Anterior cervical discectomy and fusion Case report

Jet sweeping angle control by fluidic oscillators with master-slave designs

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 Aeronautics 2021年第5期34卷 145-162页

作者： Ziyan LI Kaiwen ZHOU Yingzheng LIU xin wen Key Lab of Education Ministry for Power Machinery and Engineering School of Mechanical EngineeringShanghai Jiao Tong UniversityShanghai 200240China Gas Turbine Research Institute Shanghai Jiao Tong UniversityShanghai 200240China

The fluidic oscillator is an instrument that can continuously generate a spatially sweeping jet entirely based on its internal geometry without any moving ***,the traditional fluidic oscillator has an inherent limitation,that is,the spreading angle cannot be controlled independently,rather by the jet volume flow rate and internal ***,two types of fluidic oscillators based on the master-slave design are developed in current study to decouple this *** both designs,the master layer inherits the similar oscillation mechanisms of a sweeping jet,and the slave layer resembles a steady jet *** difference between the two designs is that Design A has a short diverging exit in the slave layer,but Design B adds a long interaction chamber in the exit channel to intensify flow *** external flow fields and governing oscillation properties of these two designs are experimentally explored with time-resolved Particle Image Velocimetry(PIV),while the internal flow dynamics and driving oscillation mechanisms are numerically *** fixing the total volume flow rate,the jet spreading angle of Design A can be increased smoothly from 0°to above 100°by increasing the proportion of master layer’s flow rate from 0 to 100%.For Design B,the control authority of the master layer is significantly enhanced by adding the interaction chamber in the slave *** addition,the added chamber causes notable jet oscillation even when the master layer has none input.

关键词： Adjustable spreading angle CFD Fluidic devices Master-slave fluidic oscillator TR-PIV