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1488 Total, 149 Pages | << First < Previous 142 143 144 145 146 147 148 Next > Last >>

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	1. Deposition, diffusion, and aggregation on small-world networks: A model for nanostructure growth on the defective substrate
	Zhi-Gang Shao,Xian-Wu Zou,Zhi-Jie Tan,Sheng-You Huang,Zhun-Zhi Jin
	Mathematics 18 June 2004
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	Abstract:Deposition, diffusion and aggregation (DDA) on a two-dimensional small-world network has been investigated by computer simulations. This model is characterized by two parameters: the clustering exponent $\alpha$ and long-range connection rate $\phi$. The results show that as $\alpha$ and $\phi$ vary there exists a continuous crossover in the fractal dimension $D_f$ from 1.65 to 2, which corresponds to the crossover from the DDA pattern to dense one. The change of the aggregation pattern results from the long-range connection in the network, which reduces the effect of screening during the aggregation. With primitive analysis, we obtain the expressions of the fractal dimension $D_f$ and the crossover point $\alpha_c$. The maximum value of $\alpha_c$ is 4. These results may be useful to describe the vapor deposition, molecular-beam epitaxy, and similar experiments on defective substrates.
	TO cite this article:Zhi-Gang Shao,Xian-Wu Zou,Zhi-Jie Tan, et al. Deposition, diffusion, and aggregation on small-world networks: A model for nanostructure growth on the defective substrate[OL].[18 June 2004] http://en.paper.edu.cn/en_releasepaper/content/837


	2. On Semi-V-Rings
	Xiaoxiang Zhang,Xianmei Song
	Mathematics 09 June 2004
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	Abstract:A ring $R$ is called a left semi-V-ring in case every simple left $R$-module has a nonzero injective cover. $R$ is a left Artinian left semi-V-ring if and only if every nonzero left $R$-module has a nonzero injective cover.
	TO cite this article:Xiaoxiang Zhang,Xianmei Song. On Semi-V-Rings[OL].[ 9 June 2004] http://en.paper.edu.cn/en_releasepaper/content/806

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	3. asymptotic expansion for the distribution of a median unbiased
	Dehui Wang,Kannda Naito
	Mathematics 04 June 2004
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	Abstract:This paper is concerned with the distributional properties of a median unbiased estimator of ARCH(0,1) coefficient. The exact distribution of the estimator can be easily derived, however its practical calculations are too heavy to implement, even though the middle range of sample sizes. Since the estimator is shown to have asymptotic normality, asymptotic expansions for the distribution and the percentiles of the estimator are derived as the refinements. Accuracies of expansion formulas are evaluated numerically, and the results of which show that we can effectively use the expansion as a fine approximation of the distribution with rapid calculations. Derived expansion are applied to testing hypothesis of stationarity, and an implementation for a real data set is illustrated.
	TO cite this article:Dehui Wang,Kannda Naito. asymptotic expansion for the distribution of a median unbiased[OL].[ 4 June 2004] http://en.paper.edu.cn/en_releasepaper/content/781


	4. MiniIB: A Maple package for computing a minimal involutive basis of linear differential system
	Shanqing Zhang,Zhibin Li
	Mathematics 31 May 2004
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	Abstract:A Maple package MiniIB is described, which is an implementation of the algorithm presented by Gerdt for the construction of minimal involutive bases for linear differential ideals. As a straightforward application, the minimal involutive bases of the determining system of classical Lie symmetry for some partial differential equation(s) are computed with package MiniIB.
	TO cite this article:Shanqing Zhang,Zhibin Li. MiniIB: A Maple package for computing a minimal involutive basis of linear differential system [OL].[31 May 2004] http://en.paper.edu.cn/en_releasepaper/content/744


	5. Gyromagnetic factor of Cr4+ ions in forsterite
	Zheng Wen-Chen,Wu Xiao-Xuan,Fan Ying-Juan
	Mathematics 31 May 2004
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	Abstract:The average value of g factor (i.e., ) of Cr4+ ions in forsterite (Mg2SiO4) is calculated with the cubic symmetry approximation from the complete high-order perturbation formula of g factor for 3d2 ion in cubic tetrahedral cluster. In the formula, the contribution to g factor from the charge-transfer mechanism (which is neglected in the crystal-field theory) is considered in addition to that from the widely used crystal-field mechanism. From the calculations, the reasonable observed value of is suggested (note: the experimental values of by various authors are scattered) and the important contribution of charge-transfer mechanism to g factor can be found.
	TO cite this article:Zheng Wen-Chen,Wu Xiao-Xuan,Fan Ying-Juan. Gyromagnetic factor of Cr4+ ions in forsterite[OL].[31 May 2004] http://en.paper.edu.cn/en_releasepaper/content/741


	6. EXPERIMENTAL INVESTIGATION OF THE WEAR CHARACTERISTICS OF SOME ENGINEERING PLASTICS UNDER WATER LUBRICATION
	Tang Qunguo,Qiu Hongli,Li Zhuangyun
	Mathematics 27 May 2004
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	Abstract:The wear characteristics of PA1010, PEEK, TX and NSM with laser cladded layer (LCL) and spasm-sprayed engineering ceramic surface (SSC) respectively under water surroundings are tested. It is found that the wear of PEEK is the least when matched with both of the materials, next is TX, whereas the wear features of PA1010 and NSM vary with the matching materials. The former’s wear increases drastically with SSC, the latter wears more with LCL. Further analysis shows that the wear mechanism of engineering plastics with LCL is mainly mechanical cutting, while with SSC is plastic transfer.
	TO cite this article:Tang Qunguo,Qiu Hongli,Li Zhuangyun. EXPERIMENTAL INVESTIGATION OF THE WEAR CHARACTERISTICS OF SOME ENGINEERING PLASTICS UNDER WATER LUBRICATION[OL].[27 May 2004] http://en.paper.edu.cn/en_releasepaper/content/736


	7. THE RESEARCH & DEVELOPMENT OF WATER HYDRAULICS AT HUAZHONG UNIVERSITY OF SCIENCE AND TECHNOLOGY
	Li Zhuangyun,Liu Yinshui,He Xiaofeng
	Mathematics 27 May 2004
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	Abstract:Water is environmentally friendly, nonflammable, inexpensive, clean, readily available, and easily disposable. As concerns for environmental compatibility, safety and hygienic requirements, hydraulic systems using natural water as pressure medium become more and more attractive. To meet the demand for this new technology, a R & D program for water hydraulics has been carried out at HUST. In this paper, the advantages of water hydraulics are discussed and the special design challenges for development of water hydraulics, such as low viscosity and poor tribological behaviour, corrosion and other material changes in water, cavitation, microorganisms’ growth and contamination control are analyzed in detail based on the authors’ research. Besides, some experimental researches on the cavitation and flow characteristics of water hydraulic throttles are introduced. At last, some of the developed seawater hydraulic components with pressure 14 MPa are presented.
	TO cite this article:Li Zhuangyun,Liu Yinshui,He Xiaofeng. THE RESEARCH & DEVELOPMENT OF WATER HYDRAULICS AT HUAZHONG UNIVERSITY OF SCIENCE AND TECHNOLOGY[OL].[27 May 2004] http://en.paper.edu.cn/en_releasepaper/content/735


	8. Amemiya norm equals Orlicz norm in variable exponent Lebesgue spaces
	Xianling Fan
	Mathematics 24 May 2004
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	Abstract:We prove that the Amemiya norm equals the Orlicz norm in variable exponent Lebesgue spaces.
	TO cite this article:Xianling Fan. Amemiya norm equals Orlicz norm in variable exponent Lebesgue spaces[OL].[24 May 2004] http://en.paper.edu.cn/en_releasepaper/content/724


	9. Studies of the g factor for Cr4+ ion in Bi4Ge3O12 crystal from crystal-field and charge-transfer mechanisms
	Wu Xiao-Xuan,Zheng Wen-Chen,Tang Sheng
	Mathematics 03 May 2004
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	Abstract:The complete third-order perturbation formulas of g factors g// and g^ for 3d2 ions in tetragonal MX4 clusters have been established from a cluster approach. In these formulas, in addition to the contributions to g factors from the crystal-field mechanism in the crystal-field theory, the contributions from the charge-transfer mechanism are included. From these formulas, the g factors g// and g^ for Cr4+ ion in Bi4Ge3O12 crystal are calculated. The results are in agreement with the observed values. The calculated Dgi (i=// or ^) due to the charge-transfer mechanism is opposite in sign and about 20% in magnitude, compared with that due to the crystal-field mechanism. So, for the 3dn ions having high valence state in crystals, the reasonable explanations of g factors should take both the crystal-field and charge-transfer mechanisms into account.
	TO cite this article:Wu Xiao-Xuan,Zheng Wen-Chen,Tang Sheng. Studies of the g factor for Cr4+ ion in Bi4Ge3O12 crystal from crystal-field and charge-transfer mechanisms[OL].[ 3 May 2004] http://en.paper.edu.cn/en_releasepaper/content/646


	10. Numerical Analysis of Bearing Pressure of Overbroken Rock Mass of Gob Area
	Weiqun Liu,Xiexing Miao
	Mathematics 12 April 2004
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	Abstract:The overbroken rock mass of gob area is made up of broken and accumulated rock blocks compressed to some extent by the above strata. The bearing pressure of gob can directly affect the safety of mining field, formation of road retained along next goaf, and seepage of air and methane of gob. In this paper, the software RFPA’2000 is used to construct numerical models, and especially the Euler method of control volume is put forward to solve the simulation difficulty come from plastically finite deformation. The results show that three characteristic regions occurred in gob area: (1) Naturally accumulated region, 0~10m far from unbroken surrounding rock walls, the bearing pressure nearly being zero; (2) Overcompacted region, 10~20m far from unbroken walls, the bearing pressure resulting in the maximum value; (3) Stable compaction region, more than 20m far from unbroken walls and occupying absolute majority of gob area, the bearing pressures basically having no difference there.
	TO cite this article:Weiqun Liu,Xiexing Miao. Numerical Analysis of Bearing Pressure of Overbroken Rock Mass of Gob Area[OL].[12 April 2004] http://en.paper.edu.cn/en_releasepaper/content/594

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