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Search Results: 1 - 10 of 80947 matches for " Xianghua LIU "
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Ultrafine Grains Formed through Tempering Cold Rolled Martensite and the Thermal Stability Analysis

LIU Xianghua,

材料研究学报 , 2008,
Abstract:
Modeling of Slab Induction Heating in Hot Rolling by FEM  [PDF]
Ruibin Mei, Changsheng Li, Xianghua Liu, Bao Li, Bin Han
Engineering (ENG) , 2011, DOI: 10.4236/eng.2011.34041
Abstract: FEM (Finite Element Method) has been widely used to solve temperature in hot rolling. The heat gen-erating rate of electromagnetic field has been discussed in order to improve the efficiency and accuracy in the solution of induction heating. A new heat generating rate model was proposed and derived from the calculated results by FEM software in consideration of work frequency, source current density, and the air gap between induction coil and slab. The calculated distribution of heat generating rate in the skin depth by the model is satisfying and reliable compared with that of FEM software. Then, the mathematic model of the heat generating rate model is considered as the density of heat reservoir to solve the temperature in induction heating. Moreover, the temperature evolution of slab in induction heating from a hot rolling plant has been solved by the developed FE code and the calculated temperature has a good agreement with the measured value. Therefore, the heat generating rate model is suitable and efficiency to solve the temperature in induction heating by FEM.
The Periodic Solitary Wave Solutions for the (2 + 1)-Dimensional Fifth-Order KdV Equation  [PDF]
Xianghua Meng
Journal of Applied Mathematics and Physics (JAMP) , 2014, DOI: 10.4236/jamp.2014.27070
Abstract:

The (2 + 1)-dimensional fifth-order KdV equation is an important higher-dimensional and higher-order extension of the famous KdV equation in fluid dynamics. In this paper, by constructing new test functions, we investigate the periodic solitary wave solutions for the (2 + 1)-dimensional fifth-order KdV equation by virtue of the Hirota bilinear form. Several novel analytic solutions for such a model are obtained and verified with the help of symbolic computation.

The Solitary Waves Solutions of the Internal Wave Benjamin-Ono Equation  [PDF]
Xianghua Meng
Journal of Applied Mathematics and Physics (JAMP) , 2014, DOI: 10.4236/jamp.2014.28089
Abstract:

The Benjamin-ono (BO) equation is an important nonlinear wave model which can describe the deep oceanic internal wave propagation. In this paper, the multi-algebraic solitary wave solutions for the internal wave BO equation including the linear velocity term in matrix form are given by the bilinear form. Based on the analytic solutions of the BO equation obtained in this paper and considering the hydrological parameters, the propagation of one-solitary wave and different kinds of interaction for the two-solitary waves are discussed and illustrated.

An Adaptive Approach of Satellite Baseline Estimation in InSAR  [PDF]
Xianghua Wang
International Journal of Geosciences (IJG) , 2015, DOI: 10.4236/ijg.2015.612100
Abstract: Baseline is an important parameter of radar interferometry. Generally, it can be estimated by satellite orbital data or ground control points. In this paper, an adaptive method is proposed to estimate it with combination satellite orbital data, and the accuracy of baseline estimated can be improved without ground control points; actual data of ERS and ENVISAT ASAR have been used in algorithm development and the final obtained elevation shows that the precise orbit data is more accurate than original orbit data in estimating baseline.
Existence and uniqueness of extreme point of total power rate functional for hot rolling problem with rigid-plastic SCM model
Shuni Song,Xianghua Liu,Guodong Wang
Chinese Science Bulletin , 2000, DOI: 10.1007/BF02884894
Abstract: The total power rate functional for hot rolling problem with the rigid-plastic SCM model is considered. The gradient operator of the plastic deformation power rate functional is deduced. It is strictly monotone mapping. Further, it is proved that the frictional power rate functional is a convex functional and the tensional stress power rate functional is a linear one. Hence, the total power rate functional is a strictly convex functional. By using nonlinear functional analysis methods, the existence and uniqueness of extreme point of the functional is obtained.
Research on Deformation, Texture and Properties of IF Steel in Multiple Rolling Technology
Jinxia LI,Xianghua LIU,Guodong WANG,

材料科学技术学报 , 2003,
Abstract: The relationships among the deformation, texture and deep drawing properties of IF steel were investigated. By adopting double cold rolling (DCR) technology, the deep drawing property has been developed evidently. With the aid of orientation distribution function (ODF) analysis, it was found that he main reason for good property is the counterbalance in intensity of the ideal texture component {111} < 011 > and {111} < 112 >.
Existence and uniqueness of extreme point of total power rate functional for hot rolling problem with rigid-plastic SCM model
SONG Shuni,LIU Xianghua,WANG Guodong,

科学通报(英文版) , 2000,
Abstract: The total power rate functional for hot rolling problem with the rigid-plastic SCM model is considered. The gradient operator of the plastic deformation power rate functional is deduced. It is strictly monotone mapping. Further, it is proved that the frictional power rate functional is a convex functional and the tensional stress power rate functional is a linear one. Hence, the total power rate functional is a strictly convex functional. By using nonlinear functional analysis methods, the existence and uniqueness of extreme point of the functional is obtained.
Distribution and Source Apportionment of Polycyclic Aromatic Hydrocarbons from Atmospheric Particulate Matter PM2.5 in Beijing
LIU Dameng,GAO Shaopeng,AN Xianghua,
LIU Dameng
,GAO Shaopeng,AN Xianghua

大气科学进展 , 2008,
Abstract: A total of 11 PM2.5 samples were collected from October 2003 to October 2004 at 8 sampling sites in Beijing city.The PM2.5 concentrations are all above the PM2.5 pollution standard(65μg m(-3))established by Environmental Protection Agency,USA(USEPA)in 1997 except for the Ming Tombs site.PM2.5 con-centrations in winter are much higher than in summer.The 16 Polycyclic aromatic hydrocarbons(PAHs)listed as priority pollutants by USEPA in PM2.5 were completely identified and quantified by high perfor-mance liquid chromatography(HPLC)with variable wavelength detector(VWD)and fluorescence detector (FLD)employed.The PM2.5 concentrations indicate that the pollution situation is still serious in Beijing.The sum of 16 PAHs concentrations ranged from 22.17 to 5366 ng m-3.The concentrations of the heavier molecular weight PAHs have a different pollution trend from the lower PAHs.Seasonal variations were mainly attributed to the difference in coal combustion emission and meteorological conditions.The source apportionment analysis suggests that PAHs from PM2.5 in Beijing city mainly come from coal combustion and vehicle exhaust emission.New measures about restricting coal combustion and vehicle exhaust must be established as soon as possible to improve the air pollution situation in Beijing city.
Effects of Pyridoxine on Selected Appetite Regulating Peptides mRNA Expression in Hypothalamic PVN/ARC Nuclei and Gastrointestinal Tract Tissues  [PDF]
Lei Liu, Haoqi Wang, Haitao Sun, Chunyan Fu, Hongli Liu, Yuqing Sun, Xianghua Xu, Weiji Chen, Wenqiang Wu, Fuchang Li
Advances in Bioscience and Biotechnology (ABB) , 2017, DOI: 10.4236/abb.2017.89020
Abstract: An experiment was conducted to investigate the effect of dietary pyridoxine on the gene expression of appetite-regulating peptides in the hypothalamus and gastrointestinal tract of rabbits. Thirty-two rabbits were randomly divided into 2 treatments for 8 weeks (16 replicates/group and 1 rabbit/replicate). The treatments were fed a basal diet (control, measured pyridoxine content is 4.51 mg/kg) and the basal diet with a pyridoxine supplementation at 10 mg/kg (pyridoxine, measured pyridoxine content is 14.64 mg/kg). The results showed that dietary pyridoxine did not significantly alter the mRNA levels of neuropeptide Y, agouti related peptide, pro-opiomelanocortin and cocaine, amphetamine regulated transcript, peptide YY and cholecystokinin in arcuate nucleus, peptide YY in jejunum and ileum, and cholecystokinin in duodenum, jejunum and ileum (P > 0.05). Compared with the control, the mRNA levels of corticotropin-releasing hormone and melanocortin 4 receptor in paraventricular nuclei and peptide YY in duodenum were significantly decreased after pyridoxine treatment (P < 0.05). In conclusion, the appetite genes of melanocortin 4 receptor and corticotropin-releasing hormone in paraventricular nuclei and peptide YY in duodenum are involved in the pyridoxine-caused hyperphagia.
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