Enhanced adsorption of Pb(II) ions from aqueous solution by persimmon tannin-activated carbon composites

The modification of activated carbon with persimmon tannin and its application for the removal of Pb(II) ions were carried out by batch method. The effects of solution pH, contact time, temperature and initial concentration on the immobilization of persimmon tannin were studied. The experimental results showed that the experimental data of persimmon tannin and Pb(II) fitted better by Langmuir adsorption isotherm model and pseudo-second order model. The adsorption capacities of adsorbents for persimmon tannin and Pb(II) were calculated from the Langmuir isotherm model, and found to be 42.97 and 12.40 mg/g at optimum pH, respectively. It was noted that the adsorbent exhibited the best adsorption property for Pb(II) when 1.0 g activated carbon was modified by 17.32 mg persimmon tannin. The modified activated carbon is more effective than the plain activated carbon, and it is expected to be an economic and effective adsorbent for the disposal of wastewater containing Pb(II) ions.     

基于看板管理的物料消耗控制系统优化方案研究

基于精益生产的思想,对某汽车零部件生产企业的原材料消耗控制系统进行了分析和改进,分析了推动式原材料消耗控制系统的缺陷,提出了基于看板管理的拉动式原材料消耗控制模式,制定了看板使用和超市运行规则.对制造企业以及想提高物料消耗控制的企业提供一定的借鉴作用.     

超声注射喷雾热分解法制备CdSe薄膜及其性能的研究

以CdCl2.2.5H2O为镉源,Na2SeSO3为硒源,柠檬酸钠为络合剂,采用超声注射喷雾热分解法制备了CdSe薄膜。并用XRD、UV-Vis、AFM等方法对其进行了表征。结果表明,所制备的薄膜为n型半导体,在可见光区有较高的吸收,可以获得较好的光电流。应用超声注射喷雾热分解法制备CdSe薄膜的优化条件为:基板温度为300℃,络合剂比例为1∶2,酸度为9,喷雾速度为0.3mL/min,退火温度为350℃。新的制备薄膜装置采用注射超声雾化手段,克服其雾化不均问题。     

一种全局LBF主动轮廓模型

LBF模型的能量函数对于水平集函数是非凸的,从而导致应用LBF模型分割的最终结果对水平集函数的初始化非常敏感。通过凸化LBF模型的能量函数,提出一种全局的LBF模型(GLBF)。该模型针对水平集函数是凸的,从而可以通过任意初始化水平集函数得到全局最优解。此外,该模型不必重新初始化水平集函数为符号距离函数,从而极大地提高运算效率。对灰度不均匀医学图像的分割结果表明,GLBF模型对水平集函数的初始化不敏感,优于传统的LBF模型以及目前具有代表性的LIF模型。     

基于ID预测的RFID防碰撞算法

多标签防碰撞算法是射频识别(RFID)系统中提高识别效率的关键技术,是当前RFID和物联网应用领域的重要研究问题.在对各种改进算法及IPA基本算法进行分析的基础上,结合JDS(跳跃式动态树形防碰撞算法)算法,提出一种精简IPA防碰撞算法.该算法通过精简ID标签中的非碰撞位,采取跳跃式后退查询策略,可有效减少通信冗余,提高识别性能.仿真结果表明,精简IPA算法较大幅度降低阅读器问询和标签应答的次数及比特数.     

一种BIBD编码的RFID防碰撞算法的改进

如何解决多标签识别时的数据冲突是射频识别(RFID)系统中的一个关键问题.为了解决这个问题,在总结分析相关一些二进制防碰撞算法的基础上,提出一种基于平衡不完全区组设计(BIBD)编码的改进型防碰撞算法.相对于传统的防碰撞算法,它以BIBD编码为基础,并且引入标签的多状态机制,使得对标签的识读达到逐节识读和识读过程中数据的传输量大大减少的目的.理论分析和仿真实验表明该算法显著提高了RFID系统的识别效率,特别适合RFID系统在标签较多和标签ID过长的情况下应用.     

基于云模型的电力生产管理软件可信评估方法

随着电力生产管理软件的规模和复杂度不断增加,对此类软件可信性的评估越来越重要。通过对电力生产管理软件质量特性的分析,确定电力生产管理软件可信性的二级评估指标,然后,利用云模型定性与定量之间的转换关系,提出基于云模型理论的电力生产管理软件可信性评估方法,通过评估因素的云模型化和云合并算法,以云模型数字特征图的形式给出最终软件可信评估等级。经过实例证实,该方法的评价结果直观,更加符合实际情况。     

文本挖掘技术在科技管理领域热点主题抽取方向的应用研究

科技管理领域热点主题抽取过程主要历经文本挖掘技术中的数据采集与清洗、信息抽取、主题分析三个阶段。其中,热点主题抽取采用TF-IDF信息抽取算法,主题聚类采用共现方法中的合并聚类。通过热点主题抽取、趋势分析和聚类分析,可以实现领域热点工作的提前预测和科学决策,有助于推动政务领域信息的智能化和知识化。     

Preface

Recently, there has been a dramatic increase in research on data mining on social networks and social media. Theubiquitous nature of Web-enabled devices, including desktops,     

Dimension reduction method of independent component analysis for process monitoring based on minimum mean square error

This article proposes a novel dimension reduction method of independent component analysis for process monitoring based on minimum mean square error (MSE). Firstly, the order of the independent components (ICs) is ranked according to their importance estimated by MSE, and the mathematical proof is presented. Secondly, the top-n ICs are selected as dominant components and the dimension of ICs is reduced. The sum of the squared independent scores (I²) and the squared prediction error (SPE) are adopted as monitoring statistics. The control limits of I² and SPE are determined by the kernel density estimation (KDE). The proposed dimension reduction method is applied to fault detection in a simple multivariate process and the simulation benchmark of Tennessee Eastman process. Finally, two fault conditions of pulverizing system in power plant are analyzed by the proposed method. The experiments results verify the effectiveness of the proposed method.