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Search Results: 1 - 10 of 81146 matches for " Zhiguo Liu "
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A Well-Balanced Numerical Model for the Simulation of Long Waves over Complex Domains  [PDF]
Gangfeng Wu, Zhiguo He, Guohua Liu
Journal of Applied Mathematics and Physics (JAMP) , 2014, DOI: 10.4236/jamp.2014.26050

This paper presents a well-balanced two-dimensional (2D) finite volume model to simulate the propagation, runup and rundown of long wave. Non-staggered grid is adopted to discretize the governing equation and the intercell flux is computed using a central upwind scheme, which is a Riemann-problem-solver-free method for hyperbolic conservation laws. The nonnegative reconstruction method for water depth is implemented in the present model to treat the appearance of wet/dry fronts, and the friction term is solved by a semi-implicit scheme to ensure the stability of the model. The Euler method is applied to update flow variable to the new time level. The model is verified against two experimental cases and good agreements are observed between numerical results and observed data.

Characterization upon electrical hysteresis and thermal diffusion of TiAl3O x dielectric film
Shi Lei,Liu Zhiguo
Nanoscale Research Letters , 2011,
Abstract: In this paper, we have investigated the electrical properties of TiAl3O x film as electrical gate insulator deposited by pulsed laser deposition and presented a simple method to describe the thermal diffusion behaviors of metal atoms at TiAl3O x /Si interfacial region in detail. The TiAl3O x films show obvious electrical hysteresis by the capacitance-voltage measurements after post-annealing treatment. By virtue of the diffusion models composed of TiAl3O x film and silicon, the diffusion coefficient and the diffusion activation energy of the Ti and Al atoms are extracted. It is valuable to further investigate the pseudobinary oxide system in practice. PACS: 77.55.-g; 81.15.Fg; 81.40.Gh.

Liu Zhiguo,

系统科学与数学 , 1998,
Abstract: An identity of q-differential operator is proved by the Leibniz formula ofq-diffrerntial operator. Some results including the known Sears' transformation and the orthogonal relation of Al--Salam-Carlitz are derived in a natural way. An extension of Askey-Roy betaintegral is also obtained.
A Monte-Carlo Approach to Cellular Pattern Evolution for Binary Alloys during Directional Solidification
Junming LIU,Zhiguo LIU,Zhuangchun WU,

材料科学技术学报 , 1995,
Abstract: A Monte-Carlo approach of cellular pattern evolution during directional solidification of a binary alloy has been carried out by imposing a non-uniform probability distribution of particle emission from the particle source, as an approach to the contribution of solute redistribution to the interface evolution. Both the bulk and interface diffusion have been involved in the simulation,and coarsening of the cellular patterns with time has been clearly revealed. The remarkable influence of the interface relaxation and the solute redistribution on the profile of solidifying interface has been presented.
Numerical study of aerosol effect on three types of clouds and precipitation in Beijing area

ZhiGuo Yue,XiaoDong Liu,ShuYan Liu,

寒旱区科学 , 2012,
Influence of olivine grains on K-Ar dating of Late-Cenozoic olivine basalts in eastern China
Zhiguo Mu,Yulin Liu,Baoling Huang
Chinese Science Bulletin , 1998, DOI: 10.1007/BF02883415
Abstract: Five Late-Cenozoic olivine basalt samples, taken from 3 young volcanoes (Keluo, Lianhuashan and Qinglongshan) located in the north of Heilongjian Province, were dated by the conventional K-Ar dating method. The apparent ages of whole rock are (0. 06 ±0. 01) Ma, (0.15 ±0.03) Ma, (0.17 ±0.02) Ma, (21.10 ±0.13) Ma and (24.46 ±0.10) Ma, respectively. In the crushed sample grains (mush number 80–100) olivine (including phynocryst and xenocryst)was picked out under a binocular microscope, then apparent ages obtained are (0.03 ±0.01) Ma, (0.06 ±0.01) Ma, (0.07 ±0.03) Ma, (2.31 ±0.02) Ma and (1.50 ±0.21) Ma, respectively. The apparent ages of the o-livine-picked out sample are come down (younger) 50% to over 90%. There are a lot of the Late-Cenozoic volcanic olivine basalt outcropping in eastern China, probably the age-datings of those basalt samples in which olivine grains are unpicked out are older than the true geological ages. The inference and conclusion drawn from those datings should be renewed.

LIU Zhiguo,

材料研究学报 , 1998,
Abstract: The influences of alloying elements on the microstructure and crack-resistance of complex boronisation layers of steel were analysed and investigated systematically.The relationship between the microstructure of complex boronisation layers and ternary phase diagram of Fe-B-M (M means metal) were determined.
Bis[1-(3,5-di-tert-butyl-2-hydroxybenzyl)-3-isopropylimidazolium] pentachlorido(tetrahydrofuran)samarate(III)–tetrahydrofuran–toluene (1/1/1)
Zhiguo Wang,Siman Liu,Qinquan Bian
Acta Crystallographica Section E , 2010, DOI: 10.1107/s1600536810017678
Abstract: The title compound, (C21H33N2O)2[SmCl5(C4H8O)]·C7H8·C4H8O, has a layered structure in which each distorted octahedral [SmCl5(THF)]2 unit (THF is tetrahydrofuran) is capped by two cations. The central metal SmIII atom of the [SmCl5(THF)]2 anionic unit is coordinated by five Cl atoms and one THF O atom, forming a distorted octahedral geometry. The crystal structure displays C—H...Cl and O—H...Cl hydrogen bonding. The structure exhibits disorder of the solvent.
Poly[3,3′-diethyl-1,1′-(ethane-1,2-diyl)diimidazolium [tetra-μ-bromido-diargentate(I)]]
Zhiguo Wang,Siman Liu,Na Zhang
Acta Crystallographica Section E , 2010, DOI: 10.1107/s160053681002146x
Abstract: The asymmetric unit of the title salt, {(C12H20N4)[Ag2Br4]}n, contains one-half of a substituted imidazolium cation, one Ag+ and two Br ions. The cation is completed by crystallographic inversion symmetry. The crystal structure is made up from polymeric sheets of {[AgBr2] }n anions extending parallel to (100). The basic building unit of the anion is a slightly distorted AgBr4 tetrahedron. A four- and 12-membered ring system is formed by corner sharing of the AgBr4 tetrahedra. The imidazolium cations are located between the anionic sheets and partly protrude into the voids defined by the 12-membered rings.
Optimization of Fermentation Medium for Producing α-Hydroxyphenylacetic Acid by Using Plackett-Burman Design and Response Surface Methodology  [PDF]
Zhiguo Hou, Bingmei Chen, Jing Lan, Yueman Liu, Xiaoping Xu, James Yu Gu, Junjie Gu
American Journal of Analytical Chemistry (AJAC) , 2013, DOI: 10.4236/ajac.2013.410070

Plackett-Burman design and response surface methodology were applied in order to optimize the fermentation medium of (R)-α-hydroxyphenylacetic acid ((R)-HPA) producing Bacillus sp. HZG-19. The factors playing important roles in the production of (R)-HPA were selected based on Plackett-Burman design. The path of steepest ascent was undertaken to optimize said fermentation medium. Finally, the optimal levels of the factors with the greatest change in regard to product yield were further optimized using Box-Behnken and response surface analysis. The optimal conditions were found to be as follows: casein peptone 30.49 (g × L-1), glycerol 14.09 (g × L-1), KH2PO4 0.1345 (g × L-1), K2HPO4 0.01

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