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Dissemination of brain inflammation in traumatic brain injury

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Cellular & Molecular Immunology 2019年第6期16卷 523-530页

作者： Kaibin shi Jianning Zhang Jing-fei dong Fu-dong shi Departments of Neurology and Neurosurgery Tianjin Neurological InstituteTianjin Medical University General HospitalTianjin 300052China Center for Neuroinflammation Beijing Tiantan HospitalCapital Medical UniversityBeijing 100050China Department of Neurology Barrow Neurological InstituteSt.Joseph’s Hospital and Medical CenterPhoenixAZ 85013USA BloodWorks Northwest Research Institute Division of HematologyDepartment of MedicineSchool of MedicineUniversity of WashingtonSeattleWA 98195USA

Traumatic brain injury(TBI)is recognized as a global health problem due to its increasing occurrence,challenging treatment,and persistent impacts on brain *** cell death in patients with TBI swiftly causes inflammation in the injured brain areas,which is recognized as focal brain *** brain inflammation causes secondary brain injury by exacerbating brain edema and neuronal death,while also exerting divergent beneficial effects,such as sealing the damaged limitans and removing cellular *** evidence from patients with TBI and studies on animal models suggest that brain inflammation after TBI is not only restricted to the focal lesion but also disseminates to remote areas of the *** dissemination of inflammation has been detected within days after the primary injury and persists *** state of inflammation may be related to remote complications of TBI in patients,such as hyperthermia and hypopituitarism,and may lead to progressive neurodegeneration,such as chronic traumatic *** studies should focus on understanding the mechanisms that govern the initiation and propagation of brain inflammation after TBI and its impacts on post-trauma brain pathology.

关键词： disseminated brain inflammation traumatic brain injury microglia post-injury neurodegeneration

Virtual instrument for monitoring process of brush plating

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中国有色金属学会会刊：英文版 2004年第z1期14卷 126-131页

作者： JING Xue-dong XU Bin-shi WANG Cheng-tao ZHU Sheng dong shi-yun School of Mechanical Engineering Shanghai Jiaotong University Shanghai 200030 China National Key Laboratory for Remanufacturing Academy of Armored Force Engineering Beijing 100072 China National Key Laboratory for Remanufacturing Academy of Armored Force Engineering Beijing 100072 China School of Mechanical Engineering Shanghai Jiaotong University Shanghai 200030 China National Key Laboratory for Remanufacturing Academy of Armored Force Engineering Beijing 100072 China National Key Laboratory for Remanufacturing Academy of Armored Force Engineering Beijing 100072 China

A virtual instrument(Ⅵ) was developed to monitor the technological parameters in the process of brush plating, including coating thickness, brush-plating current, current density, deposition rate, and brush plating voltage. Meanwhile two approaches were presented to improve the measurement accuracy of coating thickness. One of them aims at eliminating the random interferences by moving average filtering; while the other manages to calculate the quantity of electricity consumed accurately with rectangular integration. With these two approaches, the coating thickness can be measured in real time with higher accuracy than the voltage-frequency conversion method. During the process of plating all the technological parameters are displayed visually on the front panel of the Ⅵ. Once brush current or current density overruns the limited values, or when the coating thickness reaches the objective value, the virtual will alarm. With this Ⅵ, the solution consumption can be decreased and the operating efficiency is improved.

关键词： brush plating virtual instrument coating thickness measurement nano-composite coating

Bounds on the overall properties of composites with ellipsoidal inclusions

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Acta Mechanica Sinica 2012年第5期28卷 1340-1355页

作者： Lin-Zhi Wu shi-dong Pan Center for Composite Materials Harbin Institute of Technology

A new model is put forward to bound the effective elastic moduli of composites with ellipsoidal inclusions. In the present paper, transition layer for each ellipsoidal inclusion is introduced to make the trial displacement field for the upper bound and the trial stress field for the lower bound satisfy the continuous interface conditions which are absolutely necessary for the application of variational principles. According to the principles of minimum potential energy and minimum complementary energy, the upper and lower bounds on the effective elastic moduli of composites with ellipsoidal inclusions are rigorously derived. The effects of the distribution and geometric parameters of ellipsoidal in- clusions on the bounds of the effective elastic moduli are an- alyzed in details. The present upper and lower bounds are still finite when the bulk and shear moduli of ellipsoidal inclusions tend to infinity and zero, respectively. It should be mentioned that the present method is simple and needs not calculate the complex integrals of multi-point correlation functions. Meanwhile, the present paper provides an entirely different way to bound the effective elastic moduli of composites with ellipsoidal inclusions, which can be developed to obtain a series of bounds by taking different trial displacement and stress fields.

关键词： Composites Ellipsoidal inclusions Effectiveelastic moduli Upper and lower bounds Transition layer

Influence of cross correlation step length on the surface stress of thin laser cladding Fe314 alloy coatings

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International Journal of Minerals,Metallurgy and Materials 2012年第6期19卷 549-554页

作者： Bin Liu shi-yun dong Bin-shi Xu Peng He State Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology Harbin 150001 China National Key Laboratory for Remanufacturing Academy of Armored Forces Engineering Beijing 100072 China

To measure the surface stress of thin laser cladding coatings with Rayleigh waves based on the cross correlation function, this pa- per introduced the influence of cross correlation step length on the stress measurement. Flat-shaped specimens made of laser cladding Fe314 alloy coatings were performed by static tensile tests, and Rayleigh wave signals were collected during the test process with an ultrasonic pulser and receiver instrument combined with two Rayleigh wave transducers. The difference in time of flight between two signals was de- termined based on the cross correlation function. The microstructure was observed by scanning electronic microscopy. The influence of the stress on the propagation velocity of Rayleigh waves and the relationship between the difference in time of flight and tensile stress under dif- ferent cross correlation step lengths were analyzed. The inhomogeneous deformation of the coatings affects the relationship between the dif- ference in time of flight and tensile stress; the stress measurement of the coatings is nearly constant with the increase of cross correlation step length when it attains one cycle.

关键词： iron alloys metal cladding laser cladding surface stress Rayleigh waves

Properties and strengthening mechanism of brush plated nanoparticle reinforced composite coatings

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中国有色金属学会会刊：英文版 2004年第z1期14卷 182-185页

作者： dong shi-yun XU Bin-shi MA shi-ning TU Wei-yi National Key Laboratory for Remanufacturing Academy of Armored Force Engineering Beijing 100072 China National Key Laboratory for RemanufacturingAcademy of Armored Force Engineering Beijing 100072 China National Key Laboratory for RemanufacturingAcademy of Armored Force Engineering Beijing 100072 China National Key Laboratory for RemanufacturingAcademy of Armored Force Engineering Beijing 100072 China

Nanoparticle reinforced nickel matrix composite coatings, such as n-Al2O3/Ni, n-SiO2/Ni, n-SiC/Ni and n-TiO2/Ni, were fabricated by brush plating technique. Hardness, wear resistance and contact-fatigue resistance of the composite coatings were determined, and strengthening mechanism of the composite coatings was discussed. Results show that the composite coatings have superior properties to the Ni metal coating. Compared with properties of brush plated Ni metal coating, the composite coatings have hardness over 1.5 times and wear resistance capability of about 2.5 times. The strengthening mechanism of the composite coatings mainly includes fine-crystal grain effect, nanoparticle dispersion effect and dislocation effect.

关键词： nanoparticles brush plated coatings strengthening mechanism

A locking-free anisotropic nonconforming rectangular finite element approximation for the planar elasticity problem

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Applied Mathematics(A Journal of Chinese Universities) 2008年第1期23卷 9-18页

作者： shi dong-yang WANG Cai-xia Dept. of Math. Zhengzhou Univ. Zhengzhou 450052 China. Faculty of Math. and Inform. Sci. North China Univ. of Water Conservancy and Electric PowerZhengzhou 450011 China.

This paper deals with a new nonconforming anisotropic rectangular finite element approximation for the planar elasticity problem with pure displacement boundary condition. By use of the special properties of this element, and by introducing the complementary space and a series of novel techniques, the optimal error estimates of the energy norm and the L^2-norm are obtained. The restrictions of regularity assumption and quasi-uniform assumption or the inverse assumption on the meshes required in the conventional finite element methods analysis are to be got rid of and the applicable scope of the nonconforming finite elements is extended.

关键词： anisotropic mesh locking-free nonconforming finite element optimal error estimate complementary space.

Receiver Power Allocation and Transmitter Power Control Analysis for Multiple-Receiver Wireless Power Transfer Systems

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Journal of Electronic Science and Technology 2019年第4期17卷 291-299页

作者： Zhi-Hao Guo shi-Er dong the School of Civil Engineering and Geomatics Southwest Petroleum University

As different power has its own receivers,this paper analyzes and designs a multiple-receiver wireless power transfer(WPT)system *** equivalent circuit model of the system is established to analyze the key parameters including transmitter power,receiver power,transmission efficiency,and each receiver power allocation.A control circuit is proposed to achieve the maximum transmission efficiency and transmitter power control and arbitrary receiver power allocation ratios for different *** the proposed control circuit,receivers with different loads can allocate appropriate power according to its power demand,the transmitter power and system efficiency do not vary with the change of the number of ***,this control circuit is validated using a 130-kHz WPT system with three receivers whose power received is 3:10:12,and the overall system efficiency can reach as high as 55.5%.

关键词： Multiple-receiver receiver power allocation transmitter power control wireless power transfer(WPT).

Superconvergence analysis of the finite element method for nonlinear hyperbolic equations with nonlinear boundary condition

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Applied Mathematics(A Journal of Chinese Universities) 2008年第4期23卷 455-462页

作者： shi dong-yang LI Zhi-yan Department of Mathematics Zhengzhou Univercity Zhengzhou 450052 China Department of Mathematics Handan College Handan 056005 China

This paper discusses the semidiscrete finite element method for nonlinear hyperbolic equations with nonlinear boundary condition. The superclose property is derived through interpolation instead of the nonlinear H^1 projection and integral identity technique. Meanwhile, the global superconvergence is obtained based on the interpolated postprocessing techniques.

关键词： nonlinear hyperbolic equation nonlinear boundary condition superconvergence postprocessing technique

NUMERICAL ANALYSIS FOR CIRCULATION DISTRIBUTION OF PROPELLER BLADE

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Journal of Hydrodynamics 2010年第4期22卷 488-493页

作者： HONG Fang-wen dong shi-tang China ship Scientific Research Center Wuxi 214082 China

A process for numerical analysis of radial circulation distribution of propeller blade is proposed and *** is based on the results of numerical simulation of the velocity field around propeller blades and in the *** well-known traditional method using tangential velocity data in the wake and applying Stockes＇s theorem was also examined in the *** results from two approaches are compared with each *** is found that if the traditional way is utilized,in many cases an unexpected ＂hump＂ appears in the circulation distribution at certain outer *** authors calculated the circulations directly around blade sections,and it is referred as direct *** unexpected hump of the circulation distribution disappears in the results of direct *** article also discusses the reasons of the appearance of the unexpected hump in traditional *** direct method is proposed to have a potential in analyzing or verifying the radial road distribution for designed propeller and the numerical analysis instead of experimental validation for circulation distribution can be as a tool in the propeller design process.

关键词： propeller blade circulation distribution load distribution