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Thermal Rectification in Graded Nonlinear Transmission Lines

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Chinese Physics Letters 2011年第12期28卷 160-162页

作者： XU Wen chen wei-zhong TAO Feng Key Laboratory of Modern Acoustics(Ministry of Education)and Institution of Acoustics Nanjing UniversityNanjing 210093 School of Electrical Engineering and Information Anhui University of TechnologyMa'anshan 243002

We consider heat conduction in a nonlinear inductance-capacitance(LC)transmission line with an inductance gradient by adding white-noise *** is found that the heat flux in the direction of inductance decrease is larger than that in the direction of inductance *** the low-inductance end is at higher temperature,the phonon density decreases due to conversion to high-frequency phonons,which can not move to the high-inductance end due to its lower cutoff ***,when the high-inductance end is at higher temperature,the loss of phonon density can be compensated for because some high-frequency phonons can move to the low-inductance end dur to its higher cutoff *** leads to the asymmetry of energy *** shows that this asymmetry exists in a particular range of temperatures,and increases with the increase of the difference between heat baths and the inductance gradient.

关键词： phonon Graded Nonlinear

Calculation of a Nonuniform and Nonadiabatic Model of Sonoluminescence

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Chinese Physics Letters 1998年第11期15卷 813-815页

作者： XIE Zhi-Xing chen wei-zhong wei Rong-jue Institute of Acoustics and State Key Laboratory of Modern Acoustics Nanjing UniversityNanjing 210093

A nonuniform and nonadiabatic model has been developed to research the gas dynamics within a bubble of *** model includes three diffusive effects of gas viscosity,thermal conduction and radiative transport simultaneously,and calculations prove that they have important influences on the characteristics of *** model has been solved numerically and gives the results of about 104 K peak temperature and l00ps pulse duration which are consistent with recent experiments.

关键词： adiabatic bubble viscosity

Patterns in a Two-Dimensional Annular Granular Layer

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Chinese Physics Letters 2013年第4期30卷 115-118页

作者： CAI Hui chen wei-zhong MIAO Guo-Qing Institute of Acoustics and Key Laboratory of Modern Acoustics of Ministry of Education Nanjing UniversityNanjing 210093

Patterns such as periodic subharmonic waves and kink-pairs are observed experimentally in a two-dimensional vertically vibrated granular layer located in an annular channel which has a sawtooth-shaped *** the thickness of the granular layer and external excitation as control parameters,we find the transitions between different patterns in the *** dependence of the kink-pair's velocity on the external excitation is *** local velocity fields of the granular layer indicate that,in addition to horizontal transport in the layer,there is convection in the node area of a kink.

关键词： layer. excitation annular

Proteomic analysis of effects of Chinese herbs to calm the liver and suppress hyperactive yang in a rat migraine model

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Neural Regeneration Research 2008年第5期3卷 494-497页

作者： Jianjun Hu Zeqi chen Guangwei zhong wei Li Yaohui Yin Institute of Integrated Traditional Chinese and Western Medicine Xiangya Hospital Central South University Changsha 410008 HunanProvince China

BACKGROUND： The expression of ubiquitin and energy-associated protein can provoke migraines. Studies have suggested that expression is closely linked to ＂hyperactivity of liver-yang theory＂ in Traditional Chinese Medicine （TCM）, as well as the function of periphery sympathetic nerve medulla. OBJECTIVE： To observe proteomic changes in a rat migraine model with regard to hyperactivity of liver-yang when treated with Chinese herbs to calm the liver and suppress hyperactive yang compound. DESIGN, TIME AND SETTING： A randomized controlled study. This study was performed at the laboratory of Institute of Integrated Traditional Chinese and Western Medicine, Institute of Human Reproduction and Stem Cell Engineering and Key Laboratory of Cancer Proteomics of Ministry of Health, Xiangya Hospital Affiliated to Central South University between September 2006 and July 2007. MATERIALS： Thirty, male, healthy, Sprague-Dawley rats, aged eight weeks, were included in the final analysis. Aconite, to calm the liver and suppress hyperactive yang compound, was provided by the Dispensary of Traditional Chinese medicine, Xiangya Hospital, Central South University. A physiological electronic stimulator, type SDQ-1, was provided by Bengbu Practical Institute of Technology. The left trigeminal ganglion was localized and stimulated for 10 minutes, and the rats were orally administered an aconite concoction to establish a rat migraine model with hyperactivity of liver-yang. METHODS： Rats were randomly divided into a normal control group, model group, and TCM treatment group, with 10 rats in each group. The TCM treatment group was orally treated to calm the liver and suppress the hyperactive yang compound once a day for 28 days. In contrast, the model group and normal group were orally administered the same amount of distilled water once a day for 28 days. MAIN OUTCOME MEASURES： The total proteins from adrenal glands of the three groups were separated by two-dimensional gel electrophoresis （2-DE

关键词： migraine liver yang hyperactivity adrenal glands pacifying liver

Effects of Pulse Drive on Single Bubble Sonoluminescence

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Chinese Physics Letters 2001年第8期18卷 1126-1128页

作者： chen wei-zhong chen Xi LU Mei-Jun MIAO Guo-Qing wei Rong-Jue Institute of Acoustics and State Key Laboratory of Modern Acoustics Nanjing UniversityNanjing 210093

Single bubble sonoluminescence(SBSL)flashes have been steadily upscaled by a sinusoidal wave with a pulse at each cycle at some suitable phase positions,which proves the prediction of the spiking SBSL suggested by Moss et al.[***.A 211(1996)69].Based on the Rayleigh-Plesset bubble dynamics,the numerical simulation shows a well qualitative agreement with those measured in experiment.

关键词： bubble qualitative positions

Energy unidirectional transmission in an asymmetrically finite transmission line

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Chinese Physics B 2012年第1期21卷 187-191页

作者： Tao Feng chen wei-zhong Xu Wen Du Si-Dan Key Laboratory of Modern Acoustics of Ministry of Education and Institute of AcousticsNanjing UniversityNanjjng 210093China School of Electrical Engineering&Information Anhui University of TechnologyMa'anshan 243002China School of Electronic Science and Engineering Nanjing UniversityNanjing 210093China

The phenomenon of energy unidirectionM transmission is numerically investigated by using a system of two coupled discrete nonlinear electrical transmission lines, each line of the network contains a finite number of cells and has different pass band structures, respectively. Using numerical simulations, we examine the frequency multiplication of the driving frequency and the lattice filtering effect in the line. These lead to the generation of energy unidirectional transmission. In the present work, energy is carried by the second harmonic wave in the pass band. In addition, we also study the dependence of the energy efficiency on the driving amplitude and other parameters of the model, such as the system size and the nonlinear coefficient, by calculation. Furthermore, after detailed numerical simulation, an experimental demonstration is realized. The experimental results agree with those in simulation qualitatively.

关键词： energy unidirectional nonlinear transmission line linear wave

Aspherical Oscillation of Two Interacting Bubbles in an Ultrasound Field

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Chinese Physics Letters 2012年第7期29卷 164-166页

作者： LIANG Jin-Fu chen wei-zhong SHAO wei-Hang QI Shui-Bao Key Laboratory of Modern Acoustics(Ministry of Education)and Institution of Acoustics Nanjing UniversityNanjing 210093

Based on the perturbation theory and Bernoulli equation,equations of aspherical oscillation of two interacting bubbles are *** system is then used for the numerical investigation of the deformation of the two bubbles' surfaces in a spherical ultrasound field in *** find that the details of the aspherical oscillation of two bubbles are shown by the analysis of a2(t) and b2(t) that describe the surface deformation of bubbles 1 and 2,respectively.

关键词： spherical oscillation details

Formation mechanisms of water inrush and mud burst in a migmatite tunnel：a case study in China

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Journal of Mountain Science 2017年第1期14卷 188-195页

作者： WU Guo-jun chen wei-zhong YUAN Jing-qiang YANG Dian-sen BIAN Han-bian State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil Mechanics Chinese Academy of Sciences Wuhan 430071 China Research Center of Geotechnical & Structural Engineering Shandong University Jinan 250061 China LEM3 Universitd de Lorraine Ile du Saulcy Metz 57045 France

This paper presents a case study of water inrush and mud burst occurring in a migmatite tunnel to study its formation mechanisms. The geological investigation and mineralogical analysis showed that water inrush and mud burst in the migmatite was closely related to the component of the host rock. High content of soluble minerals,e.g.,calcite and dolomite,would make the migmatite rock prone to be fragmentized,isintegrated and eventually form different sorts of connected or semi-connected veins. The field exploration revealed most cavities in the magmatite tunnel were eroded by groundwater and formed large interconnected networks. The two faults and the dike in the magmatite tunnel became the preferred paths and provided great convenience for plenty of precipitation and mud slurry. Due to high water pressure and blast disturbance,the cavities can soon connect each other as well as all sorts of veins,forming a complex ground channel for water inrush and mud burst. To estimate the potential occurrenceof water inrush and mud burst,the water bursting coefficient was employed. The results showed the water bursting coefficient of the magmatite tunnel was much bigger than the threshold values and it can be used to explain the accident of water inrush and mud burst occurring in the magmatite tunnel.

关键词： Water inrush Mud burst Migmatite Formation mechanism Tunnel

Design of the yielding support used highly deformable elements for a tunnel excavated in squeezing rock

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Journal of Mountain Science 2023年第5期20卷 1458-1468页

作者： TIAN Hong-ming TIAN Yun chen wei-zhong TAN Xian-jun SHU Xiao-yun LIU Xia-lin State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan 430071China Key Laboratory of Rock Mechanics and Geohazards of Zhejiang Province School of Civil EngineeringShaoxing UniversityShaoxing 312000China College of Civil and Transportation Engineering Hohai UniversityNanjing 210024China China communications second highway survey and design institute Co. Ltd.Wuhan 430058China

Yielding support is often used in the squeezing tunnel to prevent damage to the lining induced by large deformation of the surrounding *** Deformable Elements(HDE)which is often installed along the circumferential direction of the shotcrete lining is a common type of yielding *** determine the yield parameters of HDE,the support characteristic of the lining using HDE and the ground pressure considering strain-softening of soft rock were analyzed by an analytical *** analytical solution showed that when considering the strain-softening of squeezing ground,the ground pressure has a non-zero minimum *** minimum value of ground stress can be used to determine the constant yield stress of the HDE,and the corresponding deformation of the minimum ground pressure can be used to determine the deformation capacity of the *** on the variation in the design constant yield stress and yield displacement of HDE with the in-situ stress and the mechanical parameters of the soft rock,equations were proposed for determining of the yield parameters of the HDE.

关键词： Highly deformable elements Squeezing tunnel Yielding support Strain-softening behavior