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Preparation of Entanglement and Schrdinger Cat States of Superconducting Quantum Interference Devices Qubits via Coupling to a Microwave Cavity

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Communications in Theoretical Physics 2008年第3期49卷 643-648页

作者： YANG wen-xing Department of Physics Southeast University Nanjing 210096 China Wuhan Institute of Physics and Mathematics the Chinese Academy of Sciences Wuhan 430071 China

An alternative scheme is proposed for the generation of n-qubit W states of superconducting quantum interference devices （SQUID） in cavity QED. In this scheme, Raman coupling of two lower flux states of SQUID system is achieved via a microwave pulse and the cavity mode. Conditioned on no photon leakage from the cavity, the n-qubit W state can be generated whether the effective coupling parameters of the SQUID to cavity mode and classical microwave fields are the same or different. Our strictly numerical simulations of the time evolution of the system including decay show that the success probability of our scheme is almost unity and the interaction time is on the order of 10-9 s. The scheme can also be used to generate the Schrodinger cat states of multi-SQUID.

关键词： entanglement superconducting cavity

A Backward-Looking Optimal Current Lattice Model

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Communications in Theoretical Physics 2008年第9期50卷 753-756页

作者： ZHU wen-xing Department of Automation Shanghai Jiao Tong University Shanghai 200240 China School of Control Science and Engineering Shandong University Jinan 250061 China

An optimai current lattice model with backward-looking effect is proposed to describe the motion of traffic flow on a single lane highway. The behavior of the new model is investigated anaiytically and numerically. The stability, neutrai stability, and instability conditions of the uniform flow are obtained by the use of linear stability theory. The stability of the uniform flow is strengthened effectively by the introduction of the backward-looking effect. The numerical simulations are carried out to verify the validity of the new model. The outcomes of the simulation are corresponding to the linearly analyticai results. The analytical and numerical results show that the performance of the new model is better than that of the previous models.

关键词： backward looking effect lattice model optimal current linear stability theory

Improvements in Long-Lead Prediction of Early-Summer Subtropical Frontal Rainfall Based on Arctic Sea Ice

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Journal of Ocean University of China 2019年第3期18卷 542-552页

作者： xing wen HUANG Fei Key Laboratory of Physical Oceanography Ocean University of China Qingdao 266100 China Laboratory for Ocean and Climate Dynamics Pilot National Laboratory for Marine Science and Technology (Qingdao) Qingdao 266100 China Ningbo Collaborative Innovation Center of Nonlinear Harzard System of Ocean and Atmosphere Ningbo University Ningbo 315211 China

Seasonal prediction of East Asia(EA) summer rainfall, especially with a longer-lead time, is in great demand, but still very challenging. The present study aims to make long-lead prediction of EA subtropical frontal rainfall(SFR) during early summer(May-June mean, MJ) by considering Arctic sea ice(ASI) variability as a new potential predictor. A MJ SFR index(SFRI), the leading principle component of the empirical orthogonal function(EOF) analysis applied to the MJ precipitation anomaly over EA, is defined as the predictand. Analysis of 38-year observations(1979-2016) revealed three physically consequential predictors. A stronger SFRI is preceded by dipolar ASI anomaly in the previous autumn, a sea level pressure(SLP) dipole in the Eurasian continent, and a sea surface temperature anomaly tripole pattern in the tropical Pacific in the previous winter. These precursors foreshadow an enhanced Okhotsk High, lower local SLP over EA, and a strengthened western Pacific subtropical high. These factors are controlling circulation features for a positive SFRI. A physical-empirical model was established to predict SFRI by combining the three predictors. Hindcasting was performed for the 1979-2016 period, which showed a hindcast prediction skill that was, unexpectedly, substantially higher than that of a four-dynamical models’ ensemble prediction for the 1979-2010 period(0.72 versus 0.47). Note that ASI variation is a new predictor compared with signals originating from the tropics to mid-latitudes. The long-lead hindcast skill was notably lower without the ASI signals included, implying the high practical value of ASI variation in terms of long-lead seasonal prediction of MJ EA rainfall.

关键词： East Asia subtropical frontal rainfall long-lead seasonal prediction Arctic sea ice Physical-empirical model

TAR~*:an improved process similarity measure based on unfolding of Petri nets

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计算机集成制造系统 2012年第8期18卷 1774-1784页

作者： WANG wen-xing WANG Jian-min School of Software Tsinghua University Beijing 100084 China Ministry of Education Key Laboratory for Information System Security Tsinghua UniversityBeijing 100084 China Tsinghua National Laboratory for Information Science and Technology Beijing 100084 China

Determining the similarity degree between process models was very important for their management,reuse,and *** approaches either focused on process model's structural aspect,or had inefficiency or imprecision in behavioral *** at these problems,a novel similarity measure which extended an existing method named Transition Adjacent Relation(TAR) with improved precision and efficiency named TAR * was *** ability of measuring similarity was extended by eliminating the duplicate tasks without impacting the *** precision,TARs was classified into repeatable and unrepeatable ones to identify whether a TAR was involved in a *** new kinds of TARs were added,one related to the invisible tasks after the source place and before sink place,and the other representing implicit *** efficiency,all TARs based on unfolding instead of its reach ability graph of a labeled Petri net were calculated to avoid state space *** on artificial and real-world process models showed the effectiveness and efficiency of the proposed method.

关键词： transition adjacent relation unfolding Petri nets behavioral similarity

Nonliner Analysis of a Synthesized Optimal Velocity Model for Traffic Flow

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Communications in Theoretical Physics 2008年第8期50卷 505-510页

作者： ZHU wen-xing JIA Lei School of Control Science and Engineering Shandong University Jinan 250061 China Department of Automation Shanghai Jiao Tong University Shanghai 200240 China

We analyze a new car-following model described by a differential-difference equation with a synthesized optimal velocity function (SOVF),which depends on the front interactions between every two adjacent vehicles instead of the weighted average *** model is analyzed with the use of the linear stability theory and nonlinear analysis *** stability and neutral stability condition are *** also derive the modified KdV (Korteweg-de Vries) equation and the kink-antikink soliton solution near the critical point.A simulation is conducted with integrating the differential-difference equation by the Euler *** results of the numerical simulation verify the validity of the new model.

关键词： multi-interaction nonlinear analysis modified KdV equation SOVF

Service behavior modeling and service behavior convergence-based radio resource scheduling in wireless systems

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The Journal of China Universities of Posts and Telecommunications 2011年第4期18卷 52-58,88页

作者： CAI wen-qi ZHANG xing WANG wen-bo School of Information and Communication Engineering Beijing University of Posts and Telecommunications Beijing 100876 China

With the development of wireless networks, the amount of multiple services increased sharply in recent years. High quality multiple services with low price are urgently needed especially in new generation mobile communication systems, e.g., 3G/LTE networks. It is important to enhance the availability of data service resources. Services have strong association which are used by clients with similar behavior habits in networks. Such feature results in service behavior convergence （SBC） and its utilization will enhance resource efficiency. This paper proposes two applications of service behavior： service prediction and a scheduling algorithm which enhances bandwidth efficiency. Convergence cells are classified according to SBC and hot-spot services are broadcasted separately in each convergence cell. It is demonstrated by stimulation that the bandwidth is saved 80% more than classical cellular system and nearly 20% more than traditional broadcasting system.

关键词： service behavior service prediction improved Apriori algorithm service behavior convergence

Modeling the heterogeneous traffic flow considering the effect of self-stabilizing and autonomous vehicles

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Chinese Physics B 2022年第2期31卷 434-443页

作者： Yuan Gong wen-xing Zhu School of Control Science and Engineering Shandong UniversityJinan 250061China

With the increasing maturity of automatic driving technology,the homogeneous traffic flow will gradually evolve into the heterogeneous traffic flow,which consists of human-driving and autonomous *** better study the characteristics of the heterogeneous traffic system,this paper proposes a new car-following model for autonomous vehicles and heterogeneous traffic flow,which considers the self-stabilizing effect of *** linear and nonlinear methods,this paper deduces and analyzes the stability of such a car-following model with the self-stabilizing ***,the model is verified by numerical *** results show that the self-stabilizing effect can make the heterogeneous traffic flow more stable,and that increasing the self-stabilizing coefficient or historical time length can strengthen the stability of heterogeneous traffic flow and alleviate traffic congestion *** addition,the heterogeneous traffic flow can also be stabilized with a higher proportion of autonomous vehicles.

关键词： heterogeneous traffic flow self-stabilizing effect car-following model autonomous vehicle

Rhodium-Catalyzed N-Arylation Addition of Arylboronic Acids to Ketimines

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Chinese Journal of Chemistry 2024年第18期42卷 2243-2248页

作者： Xue-Wei Qian xing-wen Sun Department of Chemistry Fudan University220 Handan RoadShanghai 200433China

Herein,we report rhodium catalyzed N-arylation via addition of arylboronic acids to electron-deficientα-iminoesters which can be prepared in high efficiency by using easily accessible B-carbonyl *** reaction is highly regiospecific to achieve the N-aryl addition efficiently with up to 99%yield under mild *** corresponding product can be further efficiently converted into indoles andaseries of other important building blocks.

关键词： Rhodium catalyzed N-Arylation addition Amines Umpolung Indole C-C coupling

Influence of Summer Monsoon on Asymmetric Bimodal Pattern of Tropical Cyclogenesis Frequency over the Bay of Bengal

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Journal of Ocean University of China 2013年第2期12卷 279-286页

作者： xing wen HUANG Fei Physical Oceanography Laboratory and Key Laboratory of Ocean-Atmosphere Interaction and Climate in Universities of Shandong Ocean University of China

The influence of summer monsoon on tropical cyclone (TC) genesis over the Bay of Bengal (BoB) is explored using an empirical genesis potential (GP) index. The annual cycle of cyclogenesis frequency over the BoB shows an asymmetric bimodal pattern with the maximum genesis number appearing in late October and the second largest in early May. The two peaks correspond to the withdrawal and onset of the BoB summer monsoon, respectively. The semimonthly GP index calculated without TC days over the BoB is consistent with TC genesis frequency, indicating that the index captures the monsoon-induced changes in the environment that are responsible for the seasonal variation of TC genesis frequency. Of the four environmental variables (i.e., low-level vorticity, mid-level relative humidity, potential intensity, and vertical wind shear) that enter into the GP index, the potential intensity makes the largest contribution to the bimodal distribution, followed by vertical wind shear due to small wind speed during the summer monsoon onset and withdrawal. The difference in TC genesis frequency between autumn and late spring is mainly owing to the relative humid-ity difference because a divergence (convergence) of horizontal moisture flux associated with cold dry northerlies (warm wet wester-lies) dominates the BoB in late spring (autumn).

关键词： tropical cyclone genesis Bay of Bengal summer monsoon asymmetric bimodal pattern GP index