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OALib Journal期刊

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The Mechanisms of Heavy Metal Uptake and Accumulation in Plants
植物对重金属的吸收和分布
LUO Chun-Ling SHEN Zhen-Guo,
罗春玲,沈振国
植物学报 , 2003,
Abstract: Phytoremediation is a technology that involves the use of plants to remove heavy metals from contaminated soil. This approach is based on the ability of plants to absorb contaminants from the soil and translocate them to their shoots. Plant uptake of a metal depends primarily on the free metal ion activity. However, some synthetic chelates have been shown to induce the uptake of metals by plants. Vacuolar compartmentalization appears to be the source of tolerance of metal-accumulating plants. In cells, proteins such as metallothioneins and phytochelatins, organic acids and amino acids also play an important role in metal ion storage and detoxification. Physiological and molecular aspects of heavy metal transport in plants are also discussed in this paper.
Distribution of NPY, SP, CGRP in rat thyroid and change under condition of acute experimental hyperthyroidism(In English)
LUO Zhen-Guo,YU Shao-Wen,HU Ping,WANG An-Tai
Acta Zoologica Sinica , 2008,
Abstract: Previous work has shown that peptidergic nerve fibers of the thyroid gland contain vasoactive intestinal polypeptide (VIP), substance P (SP) and neuropeptide Y (NPY). They contact vessel walls and epithelial cells of follicles and regulate the activity of the smooth muscle and epithelium of the follicle. It is generally accepted that the hypothalamic- pituitary -thyroid axis regulates the activity of thyroid follicles. The action of NPY, CGRP and SP, especially in hyperthyroidism, is poorly understood. The acute hyperthyroidism rat model was induced by injection of thyroxine (T4). NPY, CGRP, SP were tested by RIA. The location and distribution of NPY, CGRP and SP were studied using immunohistochemistry. NPY positive nerve fibers surrounded the small blood vessels, and their terminals contacted endothelial cells of blood vessels. Some NPY and SP positive nerve fibers were localized in connective tissue between follicles, and their terminals contacted follicular epithelial cells. No CGRP positive nerve fibers were detected. CGRP positive cells were distributed within the epithelium of follicles or adjacent to follicles. Radioimmunoassay revealed a higher level of NPY and SP in experimental rats following T4 application as compared with control rats, but the level of CGRP was lower than in controls. In hyperthyroidism, increased vasoconstriction caused by increasing of NPY overcomes the weakened vasodilation effects of CGRP decreasing to decrease blood flow and controls T4 into blood circulation. This balance may be considered as one of homeostasis mechanism under process of pathology [Acta Zoologica Sinica 54(5): 830–835, 2008].
Assembly and Release Behavior of Allopurinol Intercalated Zn/Al―NO3―LDH Composite
DU Bao-Zhong, TAI Wei, LUO Wei, PENG Zhen-Guo
无机材料学报 , 2011, DOI: 10.3724/sp.j.1077.2011.01293
Abstract: Allopurinot intercalated Zn/Al―NO3―LDH composite materials were prepared by coprecipitation and ion exchange methods. It was found by XRD, FT―IR and TG―DTA analysis that allopurinol were intercalated into the LDH layers and formed a supramolecular structure in the reaction with laminate. The structure could improved allopurinol acid resistance and thermal stability. The allopurinol intercalated LDH preparaed by coprecipitation method has an excellent sustained―release performance. It was supposed that the intercalation capacity of organic molecules was increased by a Sol―Gel intermediate which was easy for the objects to be ion―exchanged and embedded during the organic molecules intercalating into the LDH layers by coprecipitation method.
Hysteretic Behavior of Steel Column Strengthened With CFRP in Thermal Environment
Zhen-Guo Li
TELKOMNIKA : Indonesian Journal of Electrical Engineering , 2012, DOI: 10.11591/telkomnika.v10i5.1278
Abstract: This paper is concerned with analysis for the strengthening effect of carbon fiber-reinforced polymer (CFRP) on steel columns under cyclic lateral loading in thermal environment. Based on the finite element theory of thermo-elastic problem and steel structure stability theory, the hysteretic behavior of axial compression steel columns was studied by using Ansys software. The main variables investigated are: cyclic lateral loading, temperature, axial compression ratio and ductility. The results show that the CFRP wraps can improve the ultimate cyclic lateral loading and ductility of steel columns prominently in thermal environment which benefit to the anti-seismic capacity of steel structure. The effect of axial compression ratio on ultimate cyclic lateral loading is very obvious, more enhancements achieved with the axial compression ratio increased. While effect of temperature on ultimate cyclic lateral loading is not very obvious below 300℃.
Non-volatile Resistive Random Access Memory based on Oxide Films
JI Zhen-Guo
无机材料学报 , 2009,
Abstract:
Crossbreeding Particle Swarm Optimization Algorithm Based on Dynamic Parameter
基于动态参数的杂交粒子群优化算法
HUANG Wei,LUO Shi-bin,WANG Zhen-guo,
黄伟,罗世彬,王振国
计算机科学 , 2010,
Abstract: The particle swarm optimization (PSO) algorithm is easy to trapped into local extremum, and its convergence speed is lower and the precision is worse in the late evolution. Furthermore, the parameter selection can affect the algorithm. Aimed at these disadvantages of PSO,based on using the crossbreeding concept in the genetic algorithm for reference, the new algorithm by introducing dynamical parameters in the evolution of the speed equation is proposed. The convergence speed and the convergence rate were improved. The new method arc tested by function Levy No. 5 shows that the convergence speed and the average convergence rate was increased.
带脉冲效应的拟线性双曲系统(强)振动性分析
(Strong) oscillation analysis of quasilinear hyperbolic systems with impulse effect
罗李平, 罗振国, 曾云辉
LUO Li-ping, LUO Zhen-guo, ZENG Yun-hui
- , 2015, DOI: 10.6040/j.issn.1671-9352.0.2014.083
Abstract: 摘要： 研究了一类带脉冲效应的拟线性双曲系统(强)振动性质。利用新的处理拟线性扩散项的技巧及脉冲微分不等式的某些结果, 获得了该类系统在第二类边界条件下所有解(强)振动的若干充分判据, 结论充分地表明系统振动是由脉冲效应引起的。
Abstract: The (strong) oscillation properties of a class of quasilinear hyperbolic systems with impulse effect are investigated. By using a new technique of treating quasilinear diffusion term and some results of impulsive differential inequality, some sufficient criteria are obtained for the (strong) oscillation of all solutions of such systems under second boundary condition. The results fully indicate that the system oscillation are caused by impulse effect
一类带阻尼项的拟线性双曲系统的(全)振动性问题
(Full)oscillatory problems of certain quasilinear hyperbolic systems with damping term
罗李平,罗振国,曾云辉
LUO Li-ping, LUO Zhen-guo, ZENG Yun-hui
- , 2016, DOI: 10.6040/j.issn.1671-9352.0.2015.399
Abstract: 摘要： 研究一类带阻尼项的拟线性双曲系统的(全)振动性, 利用新的处理拟线性扩散项及阻尼项的技巧, 建立了这类系统在第二类边值条件下每一个解(全)振动的几个新的充分性判据, 并通过一个例子加以阐明。所得结果反映了阻尼项在决定系统的(全)振动中所起的作用。
Abstract: The(full)oscillation for a class of quasilinear hyperbolic systems with damping term are investigated. By using a new technique of treating quasilinear diffusion term and damping term, some new sufficient criteria for the(full)oscillation of each solution of such systems are established under second boundary value condition, which are illustrated by a example. The results obtained reflect the functions that damping term acts in determining the(full)oscillation of system
Minimax Probability Machine with Genetic Feature Optimized for Intrusion Detection
Zhen-Guo Chen,Shu Wang
Information Technology Journal , 2008,
Abstract: This research presents an intrusion detection method for network datasets using Minimax Probability Machines (MPM) and genetic algorithm. The minimax probability machines can achieve the comparative performance with the Support Vector Machine (SVM). To do more accurate data classification and decrease the training time of classifier, we present a genetic feature optimized method for minimax probability machines. Genetic algorithm is used to optimize the feature so as to generate newly features to boost minimax probability machines do more accurate classification and need less training time. A new classifier model based on minimax probability machines with genetic feature optimized is proposed and is applied to intrusion detection in this paper. The experimental results show that the classification method with genetic feature optimized has better performance than the traditional learning method.
Research on Preprocessing and Postprocessing of the Application of BP Neural Network
BP神经网络应用中的前后处理过程研究
CHEN Xiao-qian,LUO Shi-bin,WANG Zhen-guo,TAO Yu-jing,
陈小前,罗世彬,王振国,陶玉静
系统工程理论与实践 , 2002,
Abstract: During the application of BP neural network, some techniques in statistics are adopted. The principal component analysis is used as the preprocessing to select and optimize the sample set. The regression and correlation analysis is used as one of the postprocessing to analyze the result of training; the confidence interval analysis is used as the other postprocessing to predict the confidence bounds of output. All of these processes can be a necessary supplement of the research on the application of BP neural network.
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