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Why Can We Copy Classical Information？

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Chinese Physics Letters 2011年第1期28卷 30-31页

作者： shen Yao Key Laboratory for Atomic and Molecular Nanosciences and Department of Physics Tsinghua University Beijing 100084 Tsinghua National Laboratory for Information Science and Technology Tsinghlza University Beijing 100084

It is pointed out that the noneloning theorem in quantum mechanics also holds for unknown state in linear classical physics. The apparent capability of copying of a classical state is essentially the capability of perfect measurement in classical physics. The difference in copying- between quantum and classical physics is the difference in measurement between the two theories. A classical copying process is the combined action of measurement of an unknown state and the preparation of this state onto another system. Hence perfect measurability in classical physics enables the copying of a classical state.

关键词： Computational physics Quantum information and quantum mechanics

MATERIAL CONSTANTS OF AN Al-Li-Cu-Mg-Zr ALLOY DURING DEFORMATION AT ELEVATED TEMPERATURES

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中国有色金属学会会刊：英文版 1998年第1期8卷 79-83页

作者： Jian, shen General Research Inst for Non-ferrous Metals Beijing China

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关键词： aluminiumlithium alloy compression flow stress activation energy

Theoretical analysis of mass distribution of quasifission for ^(238)U-induced reactions

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Science China(Physics,Mechanics & Astronomy) 2014年第3期57卷 453-457页

作者： shen JunJie shen CaiWan School of Science Huzhou Teachers College

Fragment mass distributions of quasifission induced by 238U on 160, 26Mg, 32S, 35C1, 40Ca and 65Zn targets at several bombarding energies have been calculated with the two-step model. The experimental data are reproduced consistently, and the mechanism of the distribution shape is also analyzed by investigating the different incident channels.

关键词： quasifission mass distribution fusion

3D fracture modelling and limit state analysis of prestressed composite concrete pipes

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Frontiers of Structural and Civil Engineering 2019年第1期13卷 165-175页

作者： Pengfei HE Yang shen Yun GU Pangyong shen School of Aerospace Engineering and Applied Mechanics Tongji UniversityShanghai 200092China Shanghai SMI Engineering Project Management Co. Ltd.Shanghai 201103China

In this manuscript,we study fracture of prestressed cylindrical concrete *** concrete pipes play a major role in tunneling and underground *** structure is modelled fully in 3D using three-dimensional continuum elements for the concrete structure which beam elements are employed to model the *** allows the method to capture important phenomena compared to a pure shell model of concrete.A continuous approach to fracture is chosen when concrete is subjected to compressive loading while a combined continuous-discrete fracture method is employed in *** model is validated through comparisons with experimental data.

关键词： cylindrical concrete structures limit state analysis 3D fracture modelling prestressed composite pipes reinforced concrete three-point bending test

Pre-treatment to Improve the Bake-hardening Response in the Naturally Aged Al-Mg-Si Alloy

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Journal of Materials Science & Technology 2011年第3期27卷 205-212页

作者： Chin-Hui shen Department of Mechanical Engineering Army Academy No.750Longdong Rd.Zhongli CityTaoyuan County 320TaiwanChina

This paper describes pre-treatment methods to improve the bake-hardening response of naturally aged AA6022 （Al-0.6Mg-1.0Si）, which is an alloy used in automotive body panels. These methods are used to accelerate the artificial aging process, which proceeds 30-day period of natural aging. The precipitation behavior of the sheets of this aluminum alloy was analyzed by differential scanning calorimetry （DSC） and electrical conductivity measurements, and subsequently confirmed by microstructure observations by transmission electron microscopy （TEM）. Tensile tests and microhardness measurements were performed to determine the mechanical properties of the samples. Under simulated paint-baking conditions （30 min at 170℃）, the microhardness and the yield strength （YS） of the pre-strained ＋ pre-aged samples were found to be I13 HV and 225 MPa, respectively. These values are considerably higher than those of pre-aged samples, and they did not decrease significantly during the initial stage of artificial aging.

关键词： Pre-aging Pre-straining Natural aging and Bake hardening

A correction of the 2D KdV equation of Djordjevic & Redekopp in exponentially stratified fluid

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Acta Mechanica Sinica 2005年第4期21卷 346-352页

作者： Zhaoting Xu Guojin shen Samuel Shan-pu shen Institute Of Physical Oceanography and Physical Oceanography Laboratory Ocean University of China Qingdao 266003 China Department of Mathematics and Statistics Science University of Alberta Edmonton Alberta T6G 2G 1 Canada

To further study the nal solitons on the continental fission laws of initial intershelf/slope, we rederive and correct the 2D KdV equation of Djordjevic ＆ Redekopp for exponentially stratified fluid （or ocean） and with twodimensional topography. Through a combination of theoretical study and numerical experiments, we show that solitons in the odd vertical modes can fission. However, because of the corrections, the fission conditions are different from those of Djordjevic ＆ Redekopp. The even modes cannot fission unless the initial internal solitons propagate from shallow sea to deep sea. This conclusion is entirely opposite to that of Djordjevic ＆ Redekopp.

关键词： Internal wave Soliton Fission 2D KdV equation

CATALYTIC ACTIVITIES OF RARE-EARTH CALIXARENE COMPLEXES IN POLYMER SYNTHESES

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Chinese Journal of Polymer Science 2005年第6期23卷 593-602页

作者： Zhi-quan shen Institute of Polymer Science Zhejiang University Hangzhou 310027 China

The studies of our group on the catalytic activities of rare earth calixarene complexes in polymer syntheses are reviewed. Rare earth calixarene complexes are effect catalysts for the polymerizations of butadiene, isoprene, ethylene, styrene, propylene oxide, styrene oxide, trimethylene carbonate and 2,2-dimethyl-trimethylene carbonate.

关键词： Rare earth complex Calixarene Polymer synthesis.

A New Molecular Label Applied to the Study of the Yellow Sea Green Tide

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Journal of Ocean University of China 2019年第6期18卷 1507-1514页

作者： shen Weijie HE Yuan shen Songdong Department of Cell Biology College of Biology and Basic Medical Sciences Soochow University

From 2007 to 2017,large-scale green tides occurred every year in the Yellow Sea of China,and Ulva prolifera was the main species leading to the green *** this study,we used the Polymerase chain reaction and 3'Rapid-amplification of c DNA ends technique to amplify the nr DNA-LSU and IGS sequences in *** and one species of *** techniques showed 3259 bp of nrD NA-LSU and 3388 bp of IGS in *** and 3282 bp nr DNA-LSU and 3059 bp IGS in Blidingia *** the same time,tandem repeats,short dyads,palindromic and multiple simple repeat sequences in the IGS sequence were found by analyzing the structure of the IGS sequence in *** and Blidingia sp.G+C contents of the IGS sequence in *** and Blidingia *** 52.42% and 53.09%,*** divided the *** into two types according to the morphological *** the specimens of *** from the Qingdao coastal area,Jiangsu coastal area and the Yellow Sea have different morphologies,their ITS and IGS sequences are almost ***,the main species of the green tides in the Qingdao coastal area,Jiangsu coastal area and the Yellow Sea are the same and have the same origin.

关键词： LSU IGS Ulva prolifera green tide morphological characteristics

Fundamental influence of irreversible stress-strain properties in solids on the validity of the ramp loading method

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Matter and Radiation at Extremes 2024年第6期9卷 94-104页

作者： Jingxiang shen Wei Kang Center for Applied Physics and Technology and College of EngineeringPeking UniversityBeijing 100871China

The widely used quasi-isentropic ramp loading technique relies heavily on back-calculation methods that convert the measured free-surface velocity profiles to the stress-density states inside the compressed *** back-calculation methods are based on one-dimensional isentropic hydrodynamic equations,which assume a well-defined functional relationship P(p)between the longitudinal stress and density throughout the entire flow ***,this kind of idealized stress-density relation does not hold in general,because of the complexities introduced by structural phase transitions and/or elastic-plastic *** and to what extent these standard back-calculation methods may be affected by such inherent complexities is still an unsettled ***,we present a close examination using large-scale molecular dynamics(MD)simulations that include the detailed physics of the irreversibly compressed solid *** back-calculate the stress-density relation from the MD-simulated rear surface velocity profiles and compare it directly against the stress-density trajectories measured from the MD simulation *** exist in the cases studied here,and these turn out to be related to the irreversibility between compression and *** and compression waves are observed to propagate with different sound velocities in some parts of the flow field,violating the basic assumption of isentropic hydrodynamic models and thus leading to systematic back-calculation *** particular,the step-like feature of the P(p)curve corresponding to phase transition may be completely missed owing to these *** kind of mismatch between inherent properties of matter and the basic assumptions of isentropic hydrodynamics has a fundamental influence on how the ramp loading method can be applied.

关键词： field. irreversible solids