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Protective effects of L-arginine on pulmonary oxidative stress and antioxidant defenses during exhaustive exercise in rats

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Acta Pharmacologica Sinica 2005年第8期26卷 992-999页

作者： Wan-teng lin~(2,5), Suh-ching YANG~3, Kung-tung CHEN~4, Chi-chang HUANG~3, Ning-yuean LEE~(2,6) ~2 department of Nutrition and Food Sciences, Fu-Jen Catholic University, taipei, china ~3 School of Nutrition and Health Sciences, taipei Medical University, taipei, china ~4 department of General Education, Ming Hsin University of Science and technology Hsinchu, china ~5 de lin institute of technology, taipei, china department of Nutrition and Food Sciences Fu-Jen Catholic University Taipei China

Aim: To assess the effects of L-arginine (L-Arg) supplementation on pulmonary oxidative stress and antioxidant defenses in rats after exhaustive exercise. Methods: Rats were randomly divided into four groups: sedentary control (SC), sedentary control with L-Arg treatment (SC+Arg), exhaustive exercise with control diet (E) and exhaustive exercise with L-Arg treatment (E+Arg). Rats in groups SC+Arg and E+Arg received a 2% L-Arg diet. Rats in groups E and E+Arg underwent an exhaustive running test on a motorized treadmill. Pulmonary oxidative stress indices [xanthine oxidase (XO), myeloperoxidase (MPO), and malondialdehyde (MDA)] and antioxidant defense systems [superoxide dismutase (SOD), catalase (CAT), glutathione peroxidase (GPX), glutathione reductase (GR), and glutathione (GSH)] were investigated in this study. Results: L-Arg supplementation significantly reduced exercise-induced elevations of XO and MPO activities in lung. LArg reversed the exercise-induced increase in SOD and GR activities, but increased CAT and GPX activities. L-Arg administration also significantly increased the GSH levels in plasma. Conclusion: L-Arg supplementation can prevent elevations of XO and MPO activities in the lung and favorably influence pulmonary antioxidant defense systems after exhaustive exercise.

关键词： L-arginine oxidative stress xanthine oxidase myeloperoxidase exhaustive exercise lung

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SLIP linE METHOD FOR SINTERED POWdeR MATERIALS UNdeR CONDITION OF AXIAL SYMMETRY deFORMATION

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中国有色金属学会会刊：英文版 1993年第3期3卷 81-87页

作者： Zhao, Zhongzhi Hua, lin Wuhan institute of technology, Wuhan 430070, china

Slip line method for sintered powder materials under condition of axial symmetry is proposed based on the simplified yield condition of sintered powder materials and Haar-von Karman perfect plastic criterion. The equations of slip line and stress along slip line are derived, and numerical solutions are given. deformation load in closed die upsetting of sintered copper cylinder is calculated by slip line method, and theoretical solutions are compared with experimental results.

关键词： sintered powder material axial symmetry deformation slip line method

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TRACKING OBSERVATION ON SUBSURFACE CRACK IN BEARING STEEL GCr15 UNdeR ROLlinG CONTACT

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Acta Metallurgica Sinica(English Letters) 1992年第2期5卷 128-132页

作者： CHEN Longqing Zhengzhou institute of technology,Zhengzhou,china CHEN Qing Luoyang institute of technology,Luoyang,china Zhengzhou Inst of technology Zhengzhou China

Based on the sequent tracking observation on spalling of steel GCr15 under rolling contact fa- tigue,an expression for estimating the propagation of subsurface cracks was *** rol- ling contact fatigue life was found to be markedly related to the subsurface crack propagation angle.A new explanation of reason why the rolling contact fatigue life can be prolonged by residual compressive stress and retained austenite was advanced.

关键词： contact fatigue fatigue life crack propagating angle residual stress retained austenite

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SYMMETRICAL SISF IN deFORMED Ni_3Al AND ITS FORMATION MECHANISM

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Acta Metallurgica Sinica(English Letters) 1992年第2期5卷 76-81页

作者： YAN Wen Xi′an institute of technology,Xi′an,china Xi'an Inst of technology Xi'an China

The symmetrical superlattice intrinsic stacking faults(SISFs)formed on {111} planes are the predominant crystal defects in polycrystalline Ni_3AI after slight deformation at room temper- *** formation of this kind of SISF is resulted from the dipoles which are distributed on the neighboring {111} planes after reorientation,dissociation and annihilation under applied stress.

关键词： deformed Ni_3Al symmetrical stacking fault formation mechanism

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The Method of Single Peak Fourier Analysis of Measuring the Size of Mosaic Block and Microstrain by X-ray Diffraction

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Journal of Materials Science & technology 2000年第1期16卷 67-70页

作者： Ming CHANG (Tianjin institute of technology, Tianjin 300191, china) Tianjin institute of technology Tianjin 300191 China

The values of mosaic block size and microstrain measured by the method of Voigt function are sometimes largely erroneous and difficult to be revised. In this paper, the causes of the 'hook effect' which inevitably exists in the method of Fourier analysis are explained; then the method for resolving this effect is put forward; and finally the method of hypothetical function is used to simplify the method of the Fourier analysis from multi-peak to single-peak. By introducing the parameter m, this method can not only indicate the degree of errors, but also revise them as well, it is simple, clear and able to accomplish the intricate pattern calculation quickly by the aid of computer. In the end, we argue the identity between method of the approximate function and the Fourier analysis, and give a more accurate proportional coefficient k.

关键词： Measurement theory

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THE　INFLUENCE　OF　THE　SECONDARY　NORMAL　STRESS　DIFFERENCE　OF　VISCOELASTIC　FLUID　ON　ECCENTRIC　CAPSULE　FLOW

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Journal of Hydrodynamics 1995年第1期7卷 85-91页

作者： Pan Da-lin(Guangdong institute of of technology,Guangzhou 510090, P. R. china) Guangdong Inst of technology Guangzhou China

A rheological analysis of the flow of a very long, denser-than-liquid carrier, cylindrical capsule in a horizontal pipeline is presented. The analysis indicate that secondary normal stress difference of viscoelastic fluid may balance with the force caused by the difference of densities and stabilize the POsition of capsule in pipeline.

关键词： capsule flow normal stress viscoelastic fluid.

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PARALLEL ROSENBROCK METHODS FOR SOLVING STIFF SYSTEMS IN REAL-TIME SIMULATION

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Journal of Computational Mathematics 2000年第4期18卷 375-386页

作者： Li-rong Chen de-gui Liu (Beijing institute of Computer Application and Simulation technology, Beijing 100854, china) 北京计算机应用与仿真技术所北京 100854

In this paper parallel Rosenbrock methods in real-time simulation are presented on parallel computers. Their construction, their convergence and their numerical stability are studied, and the numerical simulation expe... 详细信息

关键词： Rosenbrock methods stiff system real-time simulation parallel algorithms

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Theoretical calculation of the finishing rolling elongation in non-quenched and tempered Si-Mn steel

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Progress in Natural Science:Materials International 2006年第1期16卷 78-83页

作者： LIU Zhilin and lin Cheng (department of Materials and Chemical Engineering, Liaoning institute of technology, Jinzhou 121001, china) [a]deportment of Materials and Chemical Engineering Liaoning Insitute of Technology Jinzhou China

The finishing rolling elongation in the non-quenched and tempered Si-Mn steel is theoretically calculated using the cova lent electron number nA of the strongest bond in alloying phases and the interface electron density difference △ρ. Calculations show that the finishing rolling elongation of the non-quenched and tempered Si-Mn steel can be achieved by subtracting all the elongation decrements of solution strengthening, precipitation strengthening, and interface strengthening from the elongation of the refined α-Fe matrix. The calculated results of the finishing rolling tensile strength σb, the finishing rolling yield strength σs, and the finishing elongation δ of Q345 steel and BG420CL steel agree well with the measured values.

关键词： electron structure parameters non-quenched and tempered steel elongation and calculation.

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Current density Distribution in Double-Sided GTAW Process

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Journal of Materials Science & technology 2001年第1期17卷 187-188页

作者： Hongming GAO lin WU and Honggang DONG National Key Laboratory of Advanced Welding Production technology, Harbin institute of technology, Harbin 150001, china Harbin Inst Technol Natl Key Lab Adv Welding Prod Technol Harbin 150001 Peoples R China

A three dimensional current density distribution in double-sided gas tungsten arc welding (GTAW) proces is performed. The current density distribution field is evaluated by numerically solving Maxwell equations in the domain of the workpiece. In the boundary condition, the current density on. the workpiece surface is assumed as Gaussian distribution. Results show that the current distribution in DSAW is different from single side arc welding, it is more concentrated and the relative location of the two torches influence the current distribution greatly.

关键词： current density distribution current distribution gas tungsten arc welding Gaussian distribution boundary condition workpiece surface three dimensional Maxwell equations

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CORRELATION BETWEEN MICROSTRUCTURE AND STRESS CORROSION CRACKING SUSCEPTIBILITY OF 2091 ALLOY

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Acta Metallurgica Sinica(English Letters) 1992年第12期5卷 483-488页

作者： LJ Benshun Harbin institute of technology,Harbin,china CHEN Xiangping lianghan Petroleum institute,Wuhan,china Harbin Inst of technology Harbin China

The stress corrosion cracking(SCC) susceptibility of an Al-Li-Cu-Mg-Zr alloy(2091), heat-treated under different regime,has been investigated hy means of tensile tests at slow strain *** microstructure has been examined with *** deformation characteristic has also been *** stress corrosion resistance of the alloy was revealed to be mainly affected by the covering rate of T_2-phase over grain boundaries and by the average distance between T_2-phase particles. SCC resistance can be obviously improved by predeforming the alloy at room temper- ature to reduce the precipitation of T_2-phase along grain boundaries.

关键词： AI-Li alloy stress corrosion microstructure pre-deformation

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