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Numerical studies on the boundary entanglement in an optomechanical phonon laser system

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Communications in Theoretical Physics 2020年第11期72卷 37-42页

作者： Qing-Xia Meng Zhi-Jiao Deng Shi-wei cui Department of Physics College of Liberal Arts and SciencesNational University of Defense TechnologyChangsha 410073China Northwest Institute of Nuclear Technology Xi’an 710024ShaanxiChina Interdisciplinary Center for Quantum Information National University of Defense TechnologyChangsha 410073China

In our previous work(Meng et al 2020 ***.A 101023838),we discover the phenomenon that the quantum entanglement on the driving threshold line remains a constant in a three-mode optomechanical phonon laser *** this paper,to find the conditions under which the constant boundary entanglement shows up,we explicitly study how this boundary entanglement depends on various parameters through numerical *** results show that the necessary and sufficient condition is a resonant frequency match between the optical frequency difference and the mechanical vibrational frequency,and this constant value is proportional to the multiplication of the square of the optomechanical coupling strength and the resonant driving threshold power.

关键词： boundary entanglement optomechanics phonon laser

Effects of substrate temperature and deposition time on the morphology and corrosion resistance of FeCoCrNiMo0.3 high-entropy alloy coating fabricated by magnetron sputtering

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International Journal of Minerals,Metallurgy and Materials 2020年第10期27卷 1388-1397页

作者： Chun-duo Dai Yu Fu Jia-xiang Guo cui-wei Du Institute for Advanced Materials and Technology University of Science and Technology BeijingBeijing 100083China Key Laboratory for Corrosion and Protection Ministry of EducationBeijing 100083China Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology BeijingBeijing 100083China

The effects of substrate temperature and deposition time on the morphology and corrosion resistance of FeCoCrNiMo0.3 coating fabricated by magnetron sputtering were investigated by scanning electron microscopy and electrochemical *** FeCoCrNiMo0.3 coating was mainly composed of the face-centered cubic *** substrate temperature promoted the densification of the coating,and the pitting resistance and protective ability of the coating in 3.5wt%NaCl solution was thus *** the deposition time was prolonged at 500℃,the thickness of the coating remarkably ***,the pitting resistance improved as the deposition time increased from 1 to 3 h;however,further improvement could not be obtained for the coating sputtered for 5 ***,the pitting resistance of the FeCoCrNiMo0.3 coating sputtered at 500℃for 3 h exceeds those of most of the reported high-entropy alloy coatings.

关键词： high-entropy alloy coating magnetron sputtering microstructure corrosion

Available control in dynamical decoupled quantum systems

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Chinese Science Bulletin 2012年第18期57卷 2228-2232页

作者： Yu Pan ZaiRong Xi wei cui Chinese Acad Sci Inst Syst Sci Acad Math & Syst Sci Key Lab Syst & Control Beijing 100190 Peoples R China

Dynamical decoupling (DD) eliminates qubit-bath coupling by applying a sequence of instantaneous *** qubit-bath couplings generally lead to qubit relaxation and dephasing,qubit-qubit couplings are often used to manipulate or control quantum *** investigate the available control operations in two DD schemes,named periodic DD (PDD) and Uhrig DD (UDD),to see whether universal quantum computation can be realized in these decoupled *** find that universal control is possible using Heisenberg interaction in both periodically decoupled system and Uhrig decoupled system,and the available control operations under two kinds of DD sequences obey the same commutation *** the UDD case,we also derive a rough bound for control errors.

关键词：控制操作量子系统动力学解耦脉冲序列量子计算约束控制量子位

Study on Ductility Dip Cracking susceptibility in Filler Metal 82 during welding

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Frontiers of Materials Science 2011年第2期5卷 203-208页

作者： Jing-Qing CHEN Hao LU wei cui School of Materials Science and Engineering Shanghai Jiao Tong University Shanghai 200240 China

In this paper, Ductility Dip Cracking （DDC） susceptibility in Inconel600 companion Filler Metal 82 （FM82） under different stress states is investigated. Inconel600 is a Ni-Cr-Fe alloy with excellent resistance to general corrosion, localized corrosion, and stress corrosion, which has been widely used in nuclear power plants. However, the companion FM82 has been shown to be susceptible to DDC in welding process. To resolve the problem, this work is mainly focused on evaluating DDC susceptibility in FM82 in welding process. First of all, Strain to Fracture （STF） test is used to achieve the DDC criterion under simple stress state, and the formation mechanism of DDC was explained. Real welding is a process with complex stress state. Later, to get the DDC susceptibility under complex stress state, models about multi-pass welding were built up by means of finite element method. According to numerical simulation results, relationship of deformation and temperature history is achieved. Moreover, susceptible locations and moments could be determined associated with STF results. The simulation results fairly agree with welding experiment from another research.

关键词： Ductility Dip Cracking (ODC) welding inconel600 numerical simulation

Dimensionality reduction model based on integer planning for the analysis of key indicators affecting life expectancy

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Journal of Data and Information Science 2023年第4期8卷 102-124页

作者： wei cui Zhiqiang Xu Ren Mu School of Statistics Jilin University of Finance and EconomicsChangchunJilin 130117China

Purpose:Exploring a dimensionality reduction model that can adeptly eliminate outliers and select the appropriate number of clusters is of profound theoretical and practical ***,the interpretability of these models presents a persistent ***/methodology/approach:This paper proposes two innovative dimensionality reduction models based on integer programming(DRMBIP).These models assess compactness through the correlation of each indicator with its class center,while separation is evaluated by the correlation between different class *** contrast to DRMBIP-p,the DRMBIP-v considers the threshold parameter as a variable aiming to optimally balances both compactness and ***:This study,getting data from the Global Health Observatory(GHO),investigates 141 indicators that influence life *** findings reveal that DRMBIP-p effectively reduces the dimensionality of data,ensuring *** also maintains compatibility with other ***,DRMBIP-v finds the optimal result,showing exceptional *** of the results reveals that all classes have a high *** limitations:The DRMBIP-p requires the input of the correlation threshold parameter,which plays a pivotal role in the effectiveness of the final dimensionality reduction *** the DRMBIP-v,modifying the threshold parameter to variable potentially emphasizes either separation or *** necessitates an artificial adjustment to the overflow component within the objective *** implications:The DRMBIP presented in this paper is adept at uncovering the primary geometric structures within high-dimensional *** by life expectancy data,this paper demonstrates potential to assist data miners with the reduction of data ***/value:To our knowledge,this is the first time that integer programming has been used to build a dimensionality reduction model with indicator filt

关键词： Integer programming Multidimensional data Dimensionality reduction Life expectancy

Corrosion behavior and characteristics of the product film of API X100 steel in acidic simulated soil solution

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International Journal of Minerals,Metallurgy and Materials 2016年第2期23卷 176-183页

作者： cui-wei Du Tian-liang Zhao Zhi-yong Liu Xiao-gang Li Da-wei Zhang Corrosion and Protection Center University of Science and Technology Beijing Key Laboratory of Chinese Ministry of Education for Corrosion and Prevention University of Science and Technology Beijing

The short-term corrosion behavior of API X100 steel in an acidic simulated soil was investigated by electrochemical measurements and soaking experiments,followed by corrosion morphology observations and X-ray photoelectron spectroscopy *** results show that X100 steel exhibits an obvious pitting susceptibility in an acidic soil *** nucleate after approximately 10 h of *** with the nucleation and growth of the pits,the charge-transfer resistance and open-circuit potential first increase sharply,then decrease slowly,and eventually reach a steady *** maxima of the charge-transfer resistance and open-circuit potential are attained at approximately 10 *** evolution of the electrochemical process is confirmed by the analysis of the product *** product film exhibits a porous and loose structure and could not protect the substrate *** product film is primarily composed of ferrous carbonate and ferrous hydroxide（Fe（OH）2）.The concentration of Fe（OH）2 in the product film increases from the inside to the outside layer.

关键词： oil pipelines steel corrosion acidic environment pitting corrosion corrosion films

Targeting the Cuneiform Nucleus in Parkinson’s Disease: Option to Improve Locomotor Activity

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Neuroscience Bulletin 2022年第8期38卷 976-978页

作者： wei cui Bao Xue Junxia Xie Huamin Xu Department of Physiology Shandong Provincial Key Laboratory of Pathogenesis and Prevention of Neurological DisordersSchool of Basic MedicineQingdao UniversityQingdao266071China Institute of Brain Science and Disease Qingdao UniversityQingdao266071China

Parkinson's disease(PD)is characterized by the loss of dopaminergic neurons in the substantia nigra pars compacta(SNpc),accompanied by severe locomotor deficits[1].Deep brain stimulation(DBS)mainly targeting the subthalamic nucleus and the internal segment of the globus pallidus has now been clinically used to improve the motor symptoms of PD ***,these targets do not relieve the serious postural instability and freezing of *** mesencephalic locomotor region(MLR)plays a key role in controlling locomotion[2,3].

关键词： stimulation freezing clinically

A Novel Parameter Estimation Method for Maneuvering Target Based on DCF-RFRFT

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Chinese Journal of Electronics 2017年第6期26卷 1315-1318页

作者： YANG Gang TIAN Jing WU Shuang cui wei WU Siliang School of Information and Electronics Beijing Institute of Technology Beijing Institute of Remote Sensing Equipment

To resolve the range migration and Doppler frequency spread, a new parameter estimation method, namely Dual-carrier frequency-Radon fractional Fourier transform(DCF-RFRFT), is proposed based on the dual-carrier frequency radar data. In this method,dual-carrier frequency radar data is constructed in the range frequency domain and a new signal is constructed by multiplying one with the complex conjugate of the *** fractional Fourier transform(RFRFT) is performed to obtain the estimates of velocity and acceleration. This method does not need any prior-knowledge of targets and can resolve the Doppler ambiguity problem. The simulation results demonstrate the effectiveness of the proposed algorithm.

关键词： Range migration Doppler frequency spread Radon fractional fourier transform(RFRFT)

Stress corrosion cracking of X80 pipeline steel exposed to high pH solutions with different concentrations of bicarbonate

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International Journal of Minerals,Metallurgy and Materials 2013年第7期20卷 645-652页

作者： Lin Fan cui-wei Du Zhi-yong Liu Xiao-gang Li School of Materials Science and Engineering University of Science and Technology Beijing

Susceptibilities to stress corrosion cracking （SCC） of X80 pipeline steel in high pH solutions with various concentrations of HC03 at a passive potential of-0.2 V vs. SCE were investigated by slow strain rate tensile （SSRT） test. The SCC mechanism and the effect of HC03 were discussed with the aid of electrochemical techniques. It is indicated that X80 steel shows enhunced susceptibility to SCC with the concentration of HCO3 increasing from 0.15 to 1.00 mol/L, and the susceptibility can be evaluated in terms of current density at -0.2 V vs. SCE. The SCC behavior is controlled by the dissolution-based mechanism in these circumstances. Increasing the concentration of HCO3 not only increases the risk of rupture of passive films but also promotes the anodic dissolution of crack tips. Besides, little susceptibility to SCC is found in dilute solution containing 0.05 mol/L HCO3 for X80 steel. This can be attributed to the inhibited repassivation of passive films, manifesting as a more intensive dissolution in the non-crack tip areas than at the crack tips.

关键词： pipeline steel stress corrosion cracking bicarbonate passive films