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ON MAXIMA OF DUAL FUNCTION OF THE CDT SUBPROBLEM

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Journal of Computational Mathematics 2001年第2期19卷 113-124页

作者： Xiong-da chen Ya-xiang Yuan Reserach Development Center of Parallel Software Institute of SoftwareBeijing 100080China State Key Laboratory of Scientific and Engineering Computing Institute of Computational Mathematics and Ssientific/Engineering ComputingAcademy of Mathematics and Systems SciencesChinese Academy of SciencesBeijing 100080China

Focuses on a study which determined the geometry meaning of the maxima of the CDT mathematical subproblem's dual function. Properties of trust region subproblem; Approximation of the CDT feasible region; Relations bet... 详细信息

关键词： trust region subproblem global minimizer approximation

Influence of steel corrosion on axial and eccentric compression behavior of coral aggregate concrete column

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Frontiers of Structural and Civil Engineering 2021年第6期15卷 1415-1425页

作者： Bo da Yan chen Hongfa YU Haiyan MA Bo YU da chen Xiao chen Zhangyu WU Jianbo GUO State Key Laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhan 430070China College of Harbour Coastal and Offshore EngineeringHohai UniversityNanjing 210098China Key Laboratory of Coastal Disaster and Defence of Ministry of Education Hohai UniversityNanjing 210098China Guangxi Key Laboratory of Disaster Prevention and Engineering Safety Guangxi UniversityNanning 530004China Department of Civil and Airport Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China

To study the behavior of coral aggregate concrete(CAC)column under axial and eccentric compression,the compression behavior of CAC column with different types of steel and initial eccentricity(ei)were tested,and the deformation behavior and ultimate bearing capacity(Nu)were *** results showed that as the ei increases,the Nu of CAC column decreases ***,the steel corrosion in CAC column is severe,which reduces the steel section and steel strength,and decreases the Nu of CAC *** durability of CAC structures can be improved by using new organic coated *** the influence of steel corrosion and interfacial bond deterioration,the calculation models of Nu under axial and eccentric compression were presented.

关键词： coral aggregate concrete column axial compression eccentric compression steel corrosion calculation model

ATOMISTIC SIMULATION OF POINT DEFECTS IN NiAl ALLOY

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中国有色金属学会会刊：英文版 1997年第2期7卷 129-132页

作者： Liu, Zhenyun Lin, Dongliang chen, da Shanghai Jiao Tong Univ Shanghai China

ＡＴＯＭＩＳＴＩＣＳＩＭＵＬＡＴＩＯＮＯＦＰＯＩＮＴＤＥＦＥＣＴＳＩＮＮｉＡｌＡＬＬＯＹ①ＬｉｕＺｈｅｎｙｕｎ，ＬｉｎＤｏｎｇｌｉａｎｇ，ＣｈｅｎＤａＤｅｐａｒｔｍｅｎｔｏｆＭａｔｅｒｉａｌｓＳｃｉｅｎｃｅ，Ｓｈａｎ... 详细信息

ＡＴＯＭＩＳＴＩＣＳＩＭＵＬＡＴＩＯＮＯＦＰＯＩＮＴＤＥＦＥＣＴＳＩＮＮｉＡｌＡＬＬＯＹ①ＬｉｕＺｈｅｎｙｕｎ，ＬｉｎＤｏｎｇｌｉａｎｇ，ＣｈｅｎＤａＤｅｐａｒｔｍｅｎｔｏｆＭａｔｅｒｉａｌｓＳｃｉｅｎｃｅ，ＳｈａｎｇｈａｉＪｉａｏＴｏｎｇＵｎｉｖｅ...

关键词： NiAl intermetallic point defects computer simulation

Peak shrinking and interpolating for PAPR reduction in M-IFoF-based mobile fronthaul

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Digital Communications and Networks 2022年第1期8卷 51-57页

作者： Luping Qin Haibo Li da chen Tao Jiang Research Center of 6G Mobile Communications School of Cyber Science and Engineering Huazhong University of Science and Technology1037 Luoyu RoadWuhan 430074China State Key Laboratory of Optical Communication Technologies and Networks China Information Communication Technologies Group CorporationWuhan430074China

We apply a Peak Shrinking and Interpolating(PSI)scheme to improve the Peak-to-Average Power Ratio(PAPR)performance in Multiple Intermediate-Frequency-over-Fiber(M-IFoF)based mobile *** key idea is to detect the high peaks of the signal and shrink them,and then the shrunk peak values are interpolated into the original signal to reduce the *** also compare the PSI technique with the previous Tone-Reservation(TR)technique and Phase Pre-Distortion(PPD)technique in terms of PAPR reduction effect and computational *** simulation results indicate that the PSI scheme can reduce the PAPR by more than 4.3 dB at 0.1%CCDF,which outperforms the two previous schemes with lower computational ***,we find that altering M-IFoF system parameters has little effect on the performance of the PSI technique.

关键词： Mobile fronthaul Multi-IF-Over-Fiber(M-IFoF) Peak Shrinking and Interpolating(PSI) Tone-Reservation(TR) Phase Pre-Distortion(PPD)

MOLECULAR STATIC SIMULATION OF ENERGY FEATURESOF INTERACTION BETWEEN GRAIN BOUNdaRYAND DISLOCATIONS IN Ni＿3Al ALLOY

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中国有色金属学会会刊：英文版 1994年第3期4卷 67-70,76页

作者： chen, da Lu, Min Lin, Dongliang Shanghai Jiao Tong Univ Shanghai China

ＭＯＬＥＣＵＬＡＲＳＴＡＴＩＣＳＩＭＵＬＡＴＩＯＮＯＦＥＮＥＲＧＹＦＥＡＴＵＲＥＳＯＦＩＮＴＥＲＡＣＴＩＯＮＢＥＴＷＥＥＮＧＲＡＩＮＢＯＵＮＤＡＲＹＡＮＤＤＩＳＬＯＣＡＴＩＯＮＳＩＮＮｉ＿３ＡｌＡＬＬＯＹＣｈｅｎ，Ｄ... 详细信息

ＭＯＬＥＣＵＬＡＲＳＴＡＴＩＣＳＩＭＵＬＡＴＩＯＮＯＦＥＮＥＲＧＹＦＥＡＴＵＲＥＳＯＦＩＮＴＥＲＡＣＴＩＯＮＢＥＴＷＥＥＮＧＲＡＩＮＢＯＵＮＤＡＲＹＡＮＤＤＩＳＬＯＣＡＴＩＯＮＳＩＮＮｉ＿３ＡｌＡＬＬＯＹＣｈｅｎ，Ｄａ；Ｌｕ，Ｍｉｎ；Ｌｉｎ，Ｄｏｎｇ...

关键词： Ni3Al Intermetullics grain boundary structure dislocation computer simulation

Monte Carlo study of spatial resolution of the scintillation camera

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Science China(Technological Sciences) 2011年第9期54卷 2373-2376页

作者： ZHU Jie OUYANG XiaoPing chen da Northwest Institute of Nuclear Technology Xi'an 710024 China College of Material Science and Technology Nanjing University of Aeronautics and Astronautics Nanjing 210016 China

The aim of this study was to evaluate the influence of different entrance surface treatments of the scintillator on the intrinsic spatial resolution of a scintillation *** primary scintillation light reflection on the entrance surface of a scintillator may be affected by the optical coating of the entrance surface,resulting in either spatial resolution or system detection efficiency degradation.A Monte Carlo simulation model,based on Geant4 codes,was developed in order to study the scintillation light transportation in the scintillator with an entrance surface of various optical *** results demonstrated that the application of retro-reflector on entrance surface of the scintillation crystal can significantly improve the intrinsic spatial resolution of the scintillation *** physical mechanism of the improvement of spatial resolution is explored.

关键词： surface treatments gamma camera spatial resolution Monte Carlo study

Theoretical study on boiling heat transfer in the Xi'an pulsed reactor

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Science China(Technological Sciences) 2013年第1期56卷 137-142页

作者： chen LiXin TANG XiaoBin JIANG XinBiao chen da ZHAO ZhuMin Department of Nuclear Science & Engineering Nanjing University of Aeronautics & Astronautics Northwest Institute of Nuclear Technology

Boiling heat transfer condition has significance for pool-type research reactors cooled by natural *** has important effect on the fuel element safety of *** the basis of heat transfer characteristics of the Xi'an pulsed reactor(XAPR),fuel conduction,single-phase convection and boiling heat transfer,and void fraction models of the core are *** validate the correctness of the physical models presented in the paper,numerical calculation based on a subchannel analysis method of XAPR is carried out,and the temperature fields are measured in some reactor coolant *** comparison between the calculated and experimental results verifies the effectiveness of the *** physical models are used to calculate the thermal-hydraulic parameters of XAPR at the rated power(for XAPR the rated power is 2.0 MW in steady-state operation).The results indicate that subcooled boiling occurs in the XAPR core but it exhibits a subcooling degree which is considerably higher than that of saturation *** boiling improves the efficiency of heat transfer between the fuel element surface and coolant,as well as effectively protects fuel *** research is also a beneficial reference in thermal-hydraulic analysis for other natural circulation reactors.

关键词： pulsed reactor thermal-hydraulic analysis subcooled boiling heat transfer coefficient void fraction

Oxidation of Anatase TiO2(001) (1×4) Surface

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Chinese Journal of Chemical Physics 2015年第6期28卷 -页

作者： Kuan-da chen Yong-liang Shi Jin Zhao ICQD/Hefei National Laboratory for Physical Sciences at the Microscale and Key Laboratory of Strongly-Coupled Quantum Matter Physics Chinese Academy of Sciences and Department of PhysicsUniversity of Science and Technology of China Hefei 230026 China ICQD/Hefei National Laboratory for Physical Sciences at the Microscale and Key Laboratory of Strongly-Coupled Quantum Matter Physics Chinese Academy of Sciences and Department of PhysicsUniversity of Science and Technology of China Hefei 230026 ChinaSynergetic Innovation Center of Quantum Information & Quantum Physics University of Science and Technology of China Hefei 230026 ChinaDepartment of Physics University of Pittsburgh Pittsburgh Pennsylvania 15261 USA

Anatase TiO2(001) surface arouses lots of research interests since it is believed to be the most reactive surface. However, recent STM measurements showed that except the defect sites, anatase TiO2(001) (1×4) reconstructed surface is inert to H2O adsorption. It was indicated that oxidation could be the reason which induces the inert surface reactivity. Therefore, it is strongly motivated to understand the oxidation structures as well as the oxidation process on this surface. In this work, based on first principles calculations, we investigated the oxidized structures and processes of TiO2 anatase (001) surface with (1×4) reconstruction. We have discovered two kinds of oxidized structures through the molecular adsorption and dissociated adsorption with different oxidation ratio. To understand the oxidation process, we studied the reaction barrier of oxidation process. We conclude the stability of different oxidized structures with different oxidation ratio by comparing the free energy of the system as a function of oxygen chemical potential. Based on that, a first-principles-based phase diagram of the low-energy oxidized surface structures is provided. The effects of the lattice stress are also studied. Results show that the oxidized structure and oxidation ratio strongly depend on the temperature and pressure. The lattice stress also plays an important role.

关键词： Surface phase diagram Oxidization process Surface reconstruction

Multipath multihop mmWave backhaul in ultra-dense small-cell network

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Digital Communications and Networks 2018年第2期4卷 111-117页

作者： Salman Saadat da chen Tao Jiang Wuhan National Laboratory for Optoelectronics School of Electronics Information and Communications Huazhong University of Science and Technology Wuhan430074 China

Ultra-Dense Network （UDN） is considered to be the key enabler for realizing capacity goals set by 5G. The major concern in UDN deployment is the backhaul network, which should be scalable, cost-effective, and have sufficient capacity to support massive small cell traffic. Otherwise, the backhaul can become the bottleneck of the network. In this paper, we propose a wireless backhaul solution for UDN deployment by considering MultiPath-MultiHop （MPMH） backhaul architecture in mmWave frequency band. In addition, we propose a distributed routing scheme to forward the backhaul traffic over the multihop network. Backhaul capacity and line-of-sight probability of the proposed backhaul architecture for various picocell densities were compared with direct, multiple-association, and multihop backhaul schemes under interference limited scenarios in outdoor and indoor small cell deployments. The simulation results indicate that the MPMH mmWave backhaul is the most cost-effective and scalable solution for UDN deployment.

关键词： UDN Unlicensed band Backhau mmWave Multihop Small cells