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Nuclear structure of ^(76)Ge from proton-neutron interacting boson model calculations

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Science China(Physics,Mechanics & Astronomy) 2018年第1期61卷 44-50页

作者： DaLi Zhang ChengFu mu Department of Physics Huzhou University

The properties of low-lying states in 76Ge, especially the characteristics of the mixed-symmetry states, have been investigated within the neutron-proton interacting boson model （IBM-2）. By considering the relative energy of d proton boson to be different from that of neutron boson, the low-lying positive parity levels and M1, E2 transition strengths have been calculated. The IBM-2 calculated results are in good agreement with the experimental data. Particularly, the mixed-symmetry states have been reproduced quite well. The calculation and systematic analysis demonstrated that the collective character of 76Ge lies closest to the SUπv^＊（3）, with some possible Oπv（6） dynamic symmetry in IBM-2 viewpoint.

关键词： 76Ge energy levels E2 and M1 transition strengths IBM-2

OPTIMIZING CHINA'S EXPORT STRUCTURE COMBINING GOAL PROGRAMMING AND NON-COMPETITIVE INPUT-OUTPUT MODEL

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Journal of Systems Science & Complexity 2014年第4期27卷 712-728页

作者： mu Zhirui YANG Cuihong Beijing Research Center for Science of Science Academy of Mathematics and Systems Science Chinese Academy of Sciences

supported by the Taishan Scholar Construction Engineering by Shandong Government the National Natural Science Foundation of China under Grant Nos.61120106011 and 61203029

关键词： Export structure goal programming multi-objective model non-competitive input-outputmodel processing export.

An AP-DE Algorithm Based on multi-step Gradient Method

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Chinese Journal of Electronics 2016年第1期25卷 146-151页

作者： DAI Dameng mu Dejun College of Physics and Electronic Information Engineering Wenzhou University Department of Automatic Control Northwestern Polytechincal University

Aim to improve the convergence of the adaptive filtering, based on the multi-step gradient method, a new affine pro jection algorithm with direction error is presented. The statistical behavior of the proposed algorithm is analyzed. The deterministic recursive equations for the weight error and for the Mean-square error(MSE) are derived in the weight update direction of the adaptive filtering. The steady-state MSE is also *** results show that the proposed algorithm improve the adaptive filtering convergence and corroborate the theoretical analytical results.

关键词： Affine projection Statistical behavior Adaptive filtering System identification

A semi-analytical method to compute acoustic nonlinearity parameter of Cu,Ag and Au

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Rare Metals 2023年第3期42卷 1050-1055页

作者： Zi-mu Chen Zheng Zhang School of Materials Science and Engineering Beihang UniversityBeijing 100191China

In this paper,a semi-analytical method was proposed to evaluate the acoustic nonlinearity parameter for single crystals of Cu,Ag and *** acoustic nonlinearity parameter can be derived analytically by general expressions in terms of the interatomic potentials with the distances between each pair of atoms in these transition *** evaluate the acoustic nonlinearity parameter,one needs to conduct one step molecular static simulation and obtain the equilibrium positions of all the ***,based on this method,numerical experiments with molecular dynamic code LAMMPS were given to compute the acoustic nonlinearity parameter of Cu,Ag and *** illustrate the validity of these expressions,comparison was made between calculation results and data in the *** agreement is *** of the analytical nature of this method,it provides a fundamental understanding of the nonlinear elastic behavior of these transition metals.

关键词： Nondestructive testing Semi-analytical Acoustic nonlinearity parameter Molecular static simulation

STRICT LYAPUNOV FUNCTIONS FOR IMPULSIVE HYBRID TIME-VARYING SYSTEMS WITH DISCONTINUOUS RIGHT-HAND SIDE

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Journal of Systems Science & Complexity 2011年第2期24卷 261-270页

作者： Xiaowu mu Fengjun TANG Department of Mathematics Zhengzhou University Zhengzhou Henan 450001 China.

In this paper, explicit closed form expressions of nonsmooth strict Lyapunov tunctlons for impulsive hybrid time-varying systems with discontinuous right-hand side is provided. Lyapunov functions are expressed in term... 详细信息

关键词： Filippov solution impulsive hybrid systems strict Lyapunov functions.

TOWARDS A THEORY OF GAME-BASED NON-EQUILIBRIUM CONTROL SYSTEMS

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Journal of Systems Science & Complexity 2012年第2期25卷 209-226页

作者： Yifen mu Lei GUO Institute of Systems Science Academy of Mathematics and Systems ScienceChinese Academy of Sciences

This paper considers optimization problems for a new kind of control systems based on non-equilibrium dynamic *** be precise,the authors consider the infinitely repeated games between a human and a machine based on the generic 2×2 game with fixed machine strategy of finite k-step *** introducing and analyzing the state transfer graphes(STG),it will be shown that the system state will become periodic after finite steps under the optimal strategy that maximizes the human’s averaged payoff,which helps us to ease the task of finding the optimal strategy considerably. Moreover,the question whether the optimizer will win or lose is investigated and some interesting phenomena are found,e.g.,for the standard Prisoner’s Dilemma game,the human will not lose to the machine while optimizing her own averaged payoff when k = 1;however,when k≥2,she may indeed lose if she focuses on optimizing her own payoff only The robustness of the optimal strategy and identification problem are also *** appears that both the framework and the results are beyond those in the classical control theory and the traditional game theory.

关键词： Heterogeneous players non-equilibrium dynamical games optimization state transfer graph win-loss criterion.

Private Proximity Detection for Convex Polygons

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Tsinghua Science and Technology 2016年第3期21卷 270-280页

作者： Bin mu Spiridon Bakiras Department of Computer Science Graduate Center City University of New York Department of Computer Science Michigan Technological University

Proximity detection is an emerging technology in Geo-Social Networks that notifies mobile users when they are in proximity. Nevertheless, users may be unwilling to participate in such applications if they are required to disclose their exact locations to a centralized server and/or their social friends. To this end, private proximity detection protocols allow any two parties to test for proximity while maintaining their locations secret. In particular, a private proximity detection query returns only a boolean result to the querier and, in addition, it guarantees that no party can derive any information regarding the other party＇s location. However, most of the existing protocols rely on simple grid decompositions of the space and assume that two users are in proximity when they are located inside the same grid cell. In this paper, we extend the notion of private proximity detection, and propose a novel approach that allows a mobile user to define an arbitrary convex polygon on the map and test whether his friends are located therein. Our solution employs a secure two-party computation protocol and is provably secure. We implemented our method on handheld devices and illustrate its efficiency in terms of both computational and communication costs.

关键词： proximity detection secure computations location privacy

Dynamic Protective Control Strategy for Distributed Generation System with Fixed-speed Wind Turbines

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电力系统自动化 2012年第8期36卷 178-184页

作者： mu WEI Zhe CHEN Department of Energy Technology Aalborg UniversityAalborg 9220Denmark

The characteristics of induction generator based fixed-speed wind turbines(FSWT)are *** impacts of different execution time in protective operations are studied under different fault duration and various wind velocity situations,e.g.,FSWT stabilities of load shedding in distribution *** on this research,a dynamic protective control strategy for a distributed generation system(DGS)with FSWT is ***,simulation results demonstrate the effectiveness of the strategy.

关键词：分布式发电系统控制策略动态保护风力发电机组速度执行时间风力涡轮机异步发电机

Precipitation kinetics of carbides during cyclical and isothermal aging of 2.25Cr–1Mo steel and its effect on mechanical properties

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Journal of Iron and Steel Research International 2021年第10期28卷 1282-1290页

作者： Maribel Leticia Saucedo-muñoz ESIQIE Instituto Politécnico NacionalMexico07300Mexico

The carbide precipitation was analyzed during aging of 2.25Cr–1Mo steel at 550℃.The as-received steel was aged in two different manners:the first treatment was an isothermal aging at 550℃ for time up to 1000 h,and the second one was carried out by a cyclical aging,which consisted of aging at 550℃ for 1 h,water quenching at room temperature and then newly heating at 550℃.This procedure was repeated up to 300 *** M_(23)C_(6) and M6C carbide precipitation took place intragranularly and intergranularly for both aging *** carbide coarsening was detected to occur with the increasing aging ***,the growth kinetics of precipitation occurred more rapidly in the case of cyclical *** specimen hardness decreased with the aging time in both cases;however,it occurred in shorter aging time for the cyclical *** testing indicated the increase in ductility with the aging time,and the cyclically aged specimens showed larger ductility than the isothermally aged specimens.

关键词： 2.25Cr-1Mo steel Precipitation Isothermal heating Cyclical heating Mechanical property