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Storage of Entangled States with Multiple Trapped Ions in Thermal Motion

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Communications in Theoretical Physics 2006年第4期45卷 605-608页

作者： GONG Xiao-long YANG Wen-xing Department of Physics Yangtze University Jingzhou 434100 China Department of Physics Huazhong University of Science and Technology Wuhan 430074 China Wuhan Institute of Physics and Mathematics the Chinese Academy of Sciences Wuhan 430071 China

This paper presents an alternative scheme to realize the storage of entangled states for multiple trapped ions including W state, Bell states, and GHZ states even with ions which exchange vibrational energy with a heating surrounding, Our scheme requires that the ions be simultaneously excited by two laser beams with different frequencies. In this scheme the vibrational degrees of freedom are only regarded as intermediate states and the ions exchange energy via the mediation of the vibration of the vibrational mode in coupling processes. The scheme is insensitive to both the initial vibrational state and heating if the system remains in the Lamb Dicke regime. Since the effective Rabi frequency has a small dependence on the vibrational quantum number the heating will have no direct, effect on the internal state evolution.

关键词： entangled state storage trapped ions

A step towards the application of molecular plasmonic-like excitations of PAH derivatives in organic electrochromics

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Chinese Chemical Letters 2023年第2期34卷 174-178页

作者： Yanan zhu xing xing Zhenguo Liu Hong Meng School of Advanced Materials Peking University Shenzhen Graduate SchoolShenzhen 518055China Shenzhen Research Institute of Northwestern Polytechnical University Shenzhen 518057China Institute of Flexible Electronics Northwestern Polytechnical UniversityXi'an 710072China

Polycyclic aromatic hydrocarbons(PAHs), are regarded as molecular fragments of graphene and are facilely available through chemical synthesis. Recently, it is found collective charge density oscillations with strong induced electromagnetic field display in PAH derivatives. This phenomenon, analogue to plasmonic excitation in metal, called molecular plasmonics, arise the significant interest of physicists. Instead of discussing its rich physics, this work aims at the application of molecular plasmon-like excitations in electrochromics and optoelectronics. We found that the energy and the intensity of plasmonic-like oscillation could be largely tuned by increasing the conjugation size along both the longitude/transverse axis in PAHs. Besides, the dimeric PAH demonstrates the possibility that molecular plasmonics could be designed using PAHs as building blocks for integration into larger molecular systems. Moreover, this work straightforwardly extends the molecular plasmonic-like property from C–H composed PAHs to much more versatile planar conjugation systems with heteroatoms, achieving transferring between p-type and n-type organic semiconductors. Therefore, with the natural abundance, low cost, easily chemical synthesis of PAH derivatives, we believe this work paves the way for the application of molecular plasmonic-like properties in optoelectronics.

关键词： Molecular plasmonic Organic electrochromics Polycyclic aromatic hydrocarbon p/n-type organic semiconductor

Wormhole Solution in Vacuum Brans-Dicke Theory with Cosmological Constant

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Chinese Physics Letters 1996年第6期13卷 405-408页

作者： XIAO xing-guo zhu Jian-yang Department of Physics Tianjin College of EducationTianjin 300020 Department of Physics Jiangxi Normal UniversityNanchang 330027

In this paper,we give an Euclidean wormhole solution in the Brans-Dicke theory with cosmological *** show that this wormhole is unlike all the others,its configuration is *** throat radius of the wormhole will increas... 详细信息

关键词： Brans Dicke cosmic

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

Steady-State Creep Behavior of Super304H Austenitic Steel at Elevated Temperatures

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Acta Metallurgica Sinica(English Letters) 2015年第11期28卷 1336-1343页

作者： Ping Ou long Li xing-Fei Xie Jian Sun Shanghai Key Laboratory of Advanced High-Temperature Materials and Precision Forming School of Materials Science and EngineeringShanghai Jiaotong University School of Materials Science and Engineering Jiangxi University of Science and Technology

Creep behavior of Super304H austenitic steel has been investigated at elevated temperatures of 923-973 K and at applied stress of 190-210 MPa. The results show that the apparent stress exponent and activation energy in the creep deformation range from 16.2 to 27.4 and from 602.1 to 769.3 kJ/mol at different temperatures, respectively. These high values imply the presence of a threshold stress due to an interaction between the dislocations and Cu-rich precipitates during creep deformation. The creep mechanism is associated with the dislocation climbing governed by the matrix lattice diffusion. The origin of the threshold stress is mainly attributed to the coherency strain induced in the matrix by Cu-rich precipitates. The theoretically estimated threshold stresses from Cu-rich precipitates agree reasonably with the experi- mental results.

关键词： Super304H steel Cu-rich precipitate Creep Threshold stress

Adhesion forces for water/oil droplet and bubble on coking coal surfaces with different roughness

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International Journal of Mining Science and Technology 2021年第4期31卷 681-687页

作者： Chunyun zhu Guosheng Li Yaowen xing Xiahui Gui Chinese National Engineering Research Center of Coal Preparation and Purification China University of Mining and TechnologyXuzhou 221116China School of Chemical Engineering and Technology China University of Mining and TechnologyXuzhou 221116China School of Chemical Engineering and Technology Zhengzhou UniversityZhengzhou 450052China

Surface roughness plays a significant role in floatability of *** the present paper,coking coal surface was polished by three different sandpapers and the surface properties were characterized by contact angle and roughness *** effect of surface roughness on floatability was investigated by adhesion force measurement system for measuring interaction forces between droplets/bubbles and coking coal surfaces with different *** results showed that the contact angle decreased with increasing roughness yet the adhesion force between the water droplet and coal surface increased owing to the increased contact line and the appearance of line *** adhesion forces between water and surfaces were 111.70,125.48,and 136.42μN when the roughness was 0.23,0.98,and 2.79 μm,*** contrast,under a liquid environment,the adhesion forces between air bubble/oil droplet and coal surfaces were decreased with increasing roughness because of the restriction by *** adhesion forces of increasing roughness were 97.14,42.76,and 17.86 μN measured at interfaces between air bubble and coal surfaces and 169.48,145.84,and 121.02 lN between oil droplet and surfaces,*** roughness could be beneficial to the spreading of oil droplets and the adhesion of bubbles which is conducive to flotation separation.

关键词： Adhesion force Water/oil droplet Air bubble Roughness Floatability

Ultrasonic Study on Jahn-Teller Distortions in La1/3Sr2/3CoO3

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Chinese Journal of Chemical Physics 2008年第2期21卷 136-140页

作者： Jian-xing Yi Hui Kong Chang-fei zhu Laboratory of Advanced Functional Materials and Devices Department of Materials Science and Engineering University of Science and Technology of China Hefei 230025 China

The longitudinal ultrasonic velocity （V1）, attenuation （α1）, magnetization and resistivity of single phase polycrystalline La1/3Sr2/3CoO3 were measured as a function of temperature from 20 K to 300 K. The resistivity shows metallic behavior in the whole temperature range and a kink at 235 K was observed, which coincides with the ferromagnetic transition temperature （Tc）. As the temperature cools down from Tc, the V1 softens conspicuously at beginning and reaches a minimum at 120 K. After that the V1 dramatically stiffens below 120 K accompanied by a wide attenuation peak. The analysis of the results suggests that these ultrasonic anomalies ;nay correspond to local lattice distortions via the Jahn-Teller effect of intermediate spin Co^3＋.

关键词： La1/3Sr2/3CoO3 Ultrasonic velocity and attenuation Jahn-Teller effect

Monitoring Mean and Variance Change-Points in long-Memory Time Series

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Journal of Systems Science & Complexity 2022年第3期35卷 1009-1029页

作者： CHEN Zhanshou LI Fuxiao zhu Li xing Yuhong School of Mathematics and Statistics Qinghai Normal UniversityXining 810008China Academy of Plateau Science and Sustainability Xining 810008China Department of Applied Mathematics Xi'an University of TechnologyXi'an 710048China College of Finance Xingjiang University of Finance and EconomicsUrumqi 830012China

This paper proposes two ratio-type statistics to sequentially detect mean and variance change-points in the long-memory time *** limiting distributions of monitoring statistics under the no change-point null hypothesis,alternative hypothesis as well as change-point misspecified hypothesis are *** particular,a sieve bootstrap approximation method is proposed to determine the critical *** indicate that the new monitoring procedures have better finite sample performance than the available off-line tests when the change-point nears to the beginning time of monitoring,and can discriminate between mean and variance ***,the authors illustrate their procedures via two real data sets:A set of annual volume of discharge data of the Nile river,and a set of monthly temperature data of northern *** authors find a new variance change-point in the latter data.

关键词： Change-point monitoring long-memory time series ratio-type statistic sieve bootstrap

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A Note on Parameter Estimations of Panel Vector Autoregressive Models with Intercorrelation

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Acta Mathematicae Applicatae Sinica 2009年第2期25卷 177-182页

作者： Jian-hong Wu Li-xing zhu Zai-xing Li College of Statistics and Mathematics Zhejiang Gongshang University Hangzhou 310018 China Department of Mathematics Hong Kong Baptist University Hong Kong China Department of Statistics East China Normal University Shanghai 200062 China Department of Mathematics China University of Mining and Technology Beijing 100083 China

This note considers parameter estimation for panel vector autoregressive models with intercorrelation. Conditional least squares estimators are derived and the asymptotic normality is established. A simulation is carr... 详细信息

关键词： Estimation intercorrelation panel Vector autoregression time series