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Search Results: 1 - 10 of 104330 matches for " Qingshan Zhang "
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Research on Model and Mechanism of Autonomous Management for Cellular Manufacturing  [PDF]
Qingshan Zhang, Xiang Li
iBusiness (IB) , 2011, DOI: 10.4236/ib.2011.32016
Abstract: International Engineering Consortium predicted that cellular manufacturing would become the main production model of manufacturing enterprises in the future. Based on elaborating the basic concepts, this paper proposes organizational forms, autonomous management models and coordination mechanism of cellular manufacturing, and takes expected return of two production cells as a coordination example, then gives coordination process and coordination strategy of cellular manufacturing, so as to expand production management theory and provide reference to cellular manufacturing enterprises.
Application of Microperforated-Panel Absorber in Communication Products  [PDF]
Wenfang Yu, Xianming Zhang, Qingshan Dong
Journal of Applied Mathematics and Physics (JAMP) , 2018, DOI: 10.4236/jamp.2018.61006
Base on Prof. Maa Dah-You’s general theory of the microperforated-panel (MPP) absorber, We designed a noise reduction structure-sound attenuating cabinet (SAC). It can be applied to air-cooled communication products to reduce system noise. This article introduces engineering design method of SAC and laboratory test noise reduction results of application of SAC.
Global weak solutions for the three-dimensional chemotaxis-Navier-Stokes system with nonlinear diffusion
Qingshan Zhang,Yuxiang Li
Mathematics , 2015,
Abstract: We consider an initial-boundary value problem for the incompressible chemotaxis-Navier-Stokes equations generalizing the porous-medium-type diffusion model $ \quad n_t+u\cdot\nabla n=\Delta n^m-\nabla\cdot(n\chi(c)\nabla c), $ $ \quad c_t+u\cdot\nabla c=\Delta c-nf(c), $ $ \quad u_t+\kappa(u\cdot\nabla)u=\Delta u+\nabla P+n\nabla\Phi, $ $ \quad \nabla\cdot u=0, $ in a bounded convex domain $\Omega\subset\mathbb{R}^3$. It is proved that if $m\geq\frac{2}{3}$, $\kappa\in\mathbb{R}$, $0<\chi\in C^2([0,\infty))$, $0\leq f\in C^1([0,\infty))$ with $f(0)=0$ and $\Phi\in W^{1,\infty}(\Omega)$, then for sufficiently smooth initial data $(n_0, c_0, u_0)$ the model possesses at least one global weak solution.
Boundedness in a quasilinear fully parabolic Keller-Segel system with logistic source
Qingshan Zhang,Yuxiang Li
Mathematics , 2015, DOI: 10.1007/s00033-015-0532-z
Abstract: This paper deals with the Neumann boundary value problem for the system $$u_t=\nabla\cdot\left(D(u)\nabla u\right)-\nabla\cdot\left(S(u)\nabla v\right)+f(u) ,\quad x\in\Omega,\ t>0$$ $$v_t=\Delta v-v+u,\quad x\in\Omega,\ t>0$$ in a smooth bounded domain $\Omega\subset\mathbb{R}^n$ $(n\geq1)$, where the functions $D(u)$ and $S(u)$ are supposed to be smooth satisfying $D(u)\geq Mu^{-\alpha}$ and $S(u)\leq Mu^{\beta}$ with $M>0$, $\alpha\in\mathbb{R}$ and $\beta\in\mathbb{R}$ for all $u\geq1$, and the logistic source $f(u)$ is smooth fulfilling $f(0)\geq0$ as well as $f(u)\leq a-\mu u^{\gamma}$ with $a\geq0$, $\mu>0$ and $\gamma\geq1$ for all $u\geq0$. It is shown that if $\alpha+2\beta<\gamma-1+\frac{2}{n}$, for $1\leq\gamma<2$ and $\alpha+2\beta<\gamma-1+\frac{4}{n+2}$, for $\gamma\geq2$, then for sufficiently smooth initial data the problem possesses a unique global classical solution which is uniformly bounded.
Inhibition of Cytochrome P450 3A in Rat Liver by the Diorganotin (IV) Compound di-n-Butyl-di-(4-chlorobenzo-hydroxamato)tin (IV) and Its Probable Mechanism
Yunxia Zhang,Yunlan Li,Qingshan Li
Molecules , 2012, DOI: 10.3390/molecules170910994
Abstract: The specific aims of this study were to evaluate the inhibition effect on CYP3A of di-n-butyl-di-(4-chlorobenzohydroxamato)tin (IV) (DBDCT), a tin-based complex with high antitumor activity, and the probable mechanism(s) of this action. Adult male SD rats were treated separately with natural saline (NS), lipopolysaccharide (LPS, 5 mg/kg), DBDCT (1.25, 2.5 and 5.0 mg/kg) intraperitoneally for 2 days after induction of CYP3A with dexamethasone (DEX, 100 mg/kg) for 4 days. Western blot analysis and fluorescent quantitation PCR (FQ-PCR) were conducted to determine the changes in expression of CYP3A, PXR, CAR and RXR. The biological accumulation of DBDCT and total Sn were determined by high-performance liquid chromatography (HPLC) and atomic fluorescence spectrometry (AFS). CYP450 content and CYP3A activities were significantly inhibited (p < 0.05) in DBDCT-treated rats compared with the control group, as was the expression of CYP3A (p < 0.05) at both protein and mRNA levels. In DBDCT-treated groups, the expression of PXR protein and mRNA increased, while the expression of CAR decreased. The biological accumulation of DBDCT and Sn in rat livers treated with DBDCT was high. The accumulation of DBDCT and Sn due to the inhibition of CYP3A may be involved in the mechanism of toxicity of DBDCT in rat liver.
An Initilization Method for Subspace Clustering Algorithm
Qingshan Jiang,Yanping Zhang,Lifei Chen
International Journal of Intelligent Systems and Applications , 2011,
Abstract: Soft subspace clustering is an important part and research hotspot in clustering research. Clustering in high dimensional space is especially difficult due to the sparse distribution of the data and the curse of dimensionality. By analyzing limitations of the existing algorithms, the concept of subspace difference and an improved initialization method are proposed. Based on these, a new objective function is given by taking into account the compactness of the subspace clusters and subspace difference of the clusters. And a subspace clustering algorithm based on k-means is presented. Theoretical analysis and experimental results demonstrate that the proposed algorithm significantly improves the accuracy.
Research on Evolving of Green Products’ Attribute for Manufacturing Industry
Xin Wen,Jian Xu,Qingshan Zhang
International Business Research , 2009, DOI: 10.5539/ibr.v1n3p110
Abstract: Green manufacturing is a key technology to realize eco-industry and sustainable development, it is causing people's great attention. The implementation of green manufacturing has produced revolutionary influence on the products of the manufacturing industry and manufacturing industry. Through analyzing and researching historical evolvement of product attribute, this thesis summarizes the evolving law of product attribute, and indicates developing trends of manufacturing industry green products.
Determination of the Nucleation Region Location of Si Nano-Crystal Grains Prepared by Pulsed Laser Ablation through Changing Position of Substrates  [PDF]
Zechao Deng, Qingshan Luo, Ziqiang Hu, Xiaolong Zhang, Xuecheng Ding, Lizhi Chu, Yinglong Wang
Journal of Surface Engineered Materials and Advanced Technology (JSEMAT) , 2013, DOI: 10.4236/jsemat.2013.32017

To determine the nucleation region location of Si nano-crystal grains, pulsed laser ablation of Si target is performed in Ar gas of 10 Pa at room temperature with laser fluence of 4 J/cm2, the substrates are located horizontal under ablation spot with different vertical distance. Characteristics of deposited grains are described by scanning electron microscopy, Raman scattering and X-ray diffraction spectra, the results indicate that deposition position on substrates in a certain range is relative to target surface, which changes according to different vertical distance of substrates to ablation spot. Grain size increased at first and then decreased with addition of lateral distances to target in the range, but the integral distribution rule was independent of position of substrates. Combining with hydrodynamics model, nucleation division model, thermokinetic equation and flat parabolic motion, spatial nucleation region location of grains is obtained through numerical calculations, which is 2.7 mm-43.2 mm to target surface along the plume axis.

Spin-Peierls transition in an anisotropic two-dimensional XY model
Qingshan Yuan,Yumei Zhang,Hong Chen
Physics , 1999, DOI: 10.1103/PhysRevB.64.012414
Abstract: The two-dimensional Jordan-Wigner transformation is used to investigate the zero temperature spin-Peierls transition for an anisotropic two-dimensional XY model in adiabatic limit. The phase diagram between the dimerized (D) state and uniform (U) state is shown in the parameter space of dimensionless interchain coupling $h$ $(=J_{\perp}/J)$ and spin-lattice coupling $\eta$. It is found that the spin-lattice coupling $\eta$ must exceed some critical value $\eta_c$ in order to reach the D phase for any finite $h$. The dependence of $\eta_c$ on $h$ is given by $-1/\ln h$ for $h\to 0$ and the transition between U and D phase is of first-order for at least $h>10^{-3}$.
Jinlan Yu,Qingshan Zhang,Yanhong Liu,Yunzheng Li
Acta Crystallographica Section E , 2010, DOI: 10.1107/s1600536810016764
Abstract: The title compound, C16H20N2O2, was obtained by catalytic asymmetric cycloaddition of trans-3-propylacrolein with 1-benzylidenepyrazolid-3-one betaine. There are two symmetry-independent molecules in the asymmetric unit. In both molecules, the two five-membered heterocyclic rings adopt envelope conformations.
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