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Action of Schwann Cells Implanted in Cerebral Hemorrhage Lesion

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Biomedical and Environmental Sciences 2007年第1期20卷 47-51页

作者： HONG WAN SHAO-DONG zhang JUN-hua li Beijing Neurosurgical Institute Capital Medical University Beijing 100050 China

Objective To investigate whether there is neogenesis of myelin sheath and neuron after transplantation of Schwann cells into cerebral hemorrhage lesion. Methods Schwann cells were expanded, labeled with BrdU in vitro and transplanted into rat cerebral hemorrhage with blood extracted from femoral artery and then injected into the basal nuclei. Double immunohistochemistry staining and electron microscopy were used to detect the expression of BrdU/MBP and BrdU/GAP-43 and remyelination. Results BrdU/MBP double positive cells could be seen at 1 week up to 16 weeks after transplantation of Schwann cells. Thin remyelination was observed under electron microscope. GAP-43 positive cells appeared after 12 weeks and were found more in Hippocamp. Conclusions Grafted Schwann cells participate in remyelination and promoter nerve restore in rat cerebral hemorrhage.

关键词： Schwann cell MBP GAP-43

New Ansaetze for Obtaining Exact Solutions of Nonlinear Schroedinger-Type Equation

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Communications in Theoretical Physics 2006年第2X期46卷 249-252页

作者： BAI Cheng-lin ZHAO Hong zhang li-hua School of Physical Science and Information Engineering Liaocheng University Liaocheng 252059 China School of Mathematical Science Liaocheng University Liaocheng 252059 China

We propose two simple ansaetze that allow us to obtain different analytical solutions for two generalizeal versions of the nonlinear Schrodinger equation, such as the averaged dispersive-managed fiber system equation and the extended nonlinear Schrodinger equation which describe the femtosecond pulse propagation in monomode optical fiber. Among these solutions we can find solitary wave and periodic wave solutions representing the propagation of different waveforms in nonlinear media.

关键词： nonlinear Schrodinger-type equation ansatze exact solutions

Symmetry, Reductions and New Exact Solutions of ANNV Equation Through Lax Pair

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Communications in Theoretical Physics 2008年第7期50卷 1-6页

作者： zhang li-hua liU Xi-Qiang BAI Cheng-lin Department of Mathematics Dezhou University Dezhou 253023 China School of Mathematical Sciences Liaocheng University Liaocheng 252059 China School of Physical Science and Information Engineering Liaocheng University Liaocheng 252059 China

In this paper, the direct symmetry method is extended to the Lax pair of the ANNV equation. As a result, symmetries of the Lax pair and the ANNV equation are obtained at the same time. Applying the obtained symmetry, the （2＋1）-dimensional Lax pair is reduced to （1＋1）-dimensional Lax pair, whose compatibility yields the reduction of the ANNV equation. Based on the obtained reductions of the ANNV equation, a lot of new exact solutions for the ANNV equation are found. This shows that for an integrable system, both the symmetry and the reductions can be obtained through its corresponding Lax pair.

关键词： ANNV equation direct symmetry method Lax pair reductions new exact solutions

Symmetry Groups and New Exact Solutions to （2＋1）-Dimensional Variable Coefficient Canonical Generalized KP Equation

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Communications in Theoretical Physics 2007年第3X期48卷 405-410页

作者： zhang li-hua liU Xi-Qiang BAI Cheng-lin Department of Mathematics Dezhou College Dezhou 253023 China School of Mathematical Sciences Liaocheng University Liaocheng 252059 China School of Physics Science and Information Engineering Liaocheng University Liaocheng 252059 China

In this paper, the modified CK＇s direct method to find symmetry groups of nonlinear partial differential equation is extended to （2＋1）-dimensional variable coeffficient canonical generalized KP （VCCGKP） equation. As a result, symmetry groups, lie point symmetry group and lie symmetry for the VCCGKP equation are obtained. In fact, the lie point symmetry group coincides with that obtained by the standard lie group approach. Applying the given lie symmetry, we obtain five types of similarity reductions and a lot of new exact solutions, including hyperbolic function solutions, triangular periodic solutions, Jacobi elliptic function solutions and rational solutions, for the VCCGKP equation.

关键词： (2+1)-dimensional variable coefficient canonical generalized KP (VCCGKP) equation modified CK's'direct method symmetry groups lie symmetry similarity reductions new exact solutions

New Multiple Soliton-like and Periodic Solutions for （2＋l）-Dimensional Canonical Generalized KP Equation with Variable Coefficients

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Communications in Theoretical Physics 2006年第5X期46卷 793-798页

作者： zhang li-hua liU Xi-Qiang BAI Cheng-lin School of Mathematical Sciences Liaocheng University Liaocheng 252059 China School of Physics Science and Information Engineering Liaocheng University Liaocheng 252059 China

In this paper, the generalized ranch function method is extended to （2＋1）-dimensianal canonical generalized KP （CGKP） equation with variable coetfficients. Taking advantage of the Riccati equation, many explicit exact solutions, which contain multiple soliton-like and periodic solutions, are obtained for the （2＋1）-dimensional OGKP equation with variable coetffcients.

关键词： (2+1)-dimensional canonical generalized (CGKP) equation with variable coefficients tanh function method Riccati equation soliton-like and periodic solutions

Calcined Mg-AI Layered Double Hydroxide as a Heterogeneous Catalyst for the Synthesis of Urea Derivatives from Amines and CO2

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Chinese Journal of Chemistry 2013年第3期31卷 381-387页

作者： Ran zhang li hua li Guo Baoning Song Jizhong Chen Zhenshan Hou Key Laboratory for Advanced Materials Research Institute of Industrial Catalysis East China University of Science and Technology Shanghai 200237 China

The calcined Mg-A1 layered double hydroxides （LDHs） with a Mg/A1 molar ratio of 3 ： 1 were synthesized and characterized thoroughly by X-ray diffraction （XRD）, temperature-programmed desorption （TPD） of CO2, and thermogravimetric analysis （TGA）. Thus the calcined Mg-A1 LDHs were used as catalyst for the catalytic synthesis of disubstituted ureas from amines and CO2. The effects of reaction time, reaction temperature, pressure, solvent and calcined temperature on activity have been investigated. The results indicated that aliphatic amines, cyclo- hexylamine and benzylamine can be converted to the corresponding ureas selectively over the calcined Mg-A1 LDHs catalysts with N-methyl-2-pyrrolidone （NMP） as solvent without using any dehydrating regent. The catalyst can be recycled several times with only slight loss of activity.

关键词： carbon dioxide 1,3-disubstituted urea hydrotalcites layered double hydroxide heterogeneous cataly-sis

Preparation of Uniform Ni-B Amorphous Alloy Catalyst on CNTs and its Performance for Acetylene Selective Hydrogenation

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Chinese Chemical Letters 2006年第1期17卷 109-112页

作者： Chang Yuan HU Feng Yi li Rong Bin zhang li hua Department of Chemistry Nanchang University Nanchang 330047

Uniform Ni-B amorphous alloys about 14 nm have been prepared on CNTs-A support,named Ni-B/CNTs-A. In comparison with the Ni-B/CNTs amorphous catalyst, Ni-B/CNTs-A showed higher nickel loading, determined by ICP and be... 详细信息

关键词： CNTs aniline Ni-B amorphous alloy catalyst acetylene selective hydrogenation.

Smith Prediction Monitor AGC System Based on Fuzzy Self-Tuning PID Control

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Journal of Iron and Steel Research International 2010年第2期17卷 22-26页

作者： SUN Jie zhang Dian-hua li Xu zhang Jin DU De-shun State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110004 Liaoning China

In accordance with the feature of pure delay in monitor AGC system for cold rolling mill, a new fuzzy selftuning PID Smith prediction controller is developed. The position control model is deduced based on a single stand cold rolling mill, and the fuzzy controller for monitor AGC system is designed. The analysis of dynamic performance for traditional PID Smith prediction controller and fuzzy self-tuning PID Smith prediction controller is done by MAT- LAB toolbox. The simulation results show that fuzzy self-tuning PID Smith controller has stronger robustness, faster response and higher static accuracy than traditional PID Smith controller.

关键词： monitor AGC fuzzy self-tuning PID control Smith predictor position control

Synthesis and Crystal Structure of a Novel 1D Magnesium(II) Coordination Polymer Constructed by L-Cysteic Acid

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Chinese Journal of Structural Chemistry 2007年第8期26卷 907-910页

作者： li Hai-Ye liAO Bei-ling JIANG Yi-Min zhang Shu-hua li Jun-Xia College of Chemistry and Chemical Engineering Guangxi Normal University Guilin 541004 China

A novel coordination polymer [Mg（L）（H2O）2]·H2O] （LH2=L-cysteic acid） has been synthesized and characterized by elemental analysis, IR and single-crystal X-ray *** crystal crystallizes in orthorhombic system, space group P212121, with a=5.962（3）, b=11.224（6）, c=13.664（7）A, V=914.3（8）A^3, Z=4, Mr=245.50, Dc=1.783 g/cm^3,μ=0.445 mm-1,flack parameter=0.32（16）, F（000）=512, the final R=0.0458 and wR=0.1172 for 1578 observed reflections with I 〉 2σ（Ⅰ）. The Mg（Ⅱ） atom shows an octahedral geometry defined by two carboxyl O atoms from two different L-cysteic acid ligands, one carboxyl O atom and one amino N atom from the adjacent ligand, and two aqua ligands. The Mg（Ⅱ） atoms are bridged by L-cysteic acid ligands, leading to a 1D infinite zigzag chain. In the structure there are extensive hydrogen bonds,through which the complex completes its 3D framework structure.

关键词： magnesium(Ⅱ) complex L-cysteic acid synthesis crystal structure