Assessment of a redox alkaline/iron-chelate absorption process for the removal of dilute hydrogen sulfide in air emissions

The oxidative absorption of hydrogen sulfide (H₂S) into a solution of ferric chelate of trans-1,2- diaminocyclohexanetetraacetate (CDTA) was studied in a counter-current laboratory column randomly packed with 15 mm plastic Ralu rings. The present investigation takes concern about the Kraft pulping situation where dilute H₂S concentrations are omnipresent in large-volume gas effluents. A fractional two-level factorial approach was instigated to determine the significance of six operating variables, namely the solution's alkalinity (pH; 8.5-10.5), the liquid mass flow rate (L;1.73-), the solution's ionic strength (I_C;0.01-), the gas mass flow rate (G;0.19-), the inlet H₂S concentration (C_H2S,0;70-430 ppm) and the initial ferric CDTA concentration (C_Fe,0;100 -). Initially, a Plackett-Burman design matrix of seven duplicated experiments revealed that pH is the leading factor controlling the H₂S conversion rate while the ionic strength and ferric CDTA concentration effects remained negligible within the factorial domain. Surface response analysis based on 11 duplicated factorial experiments plus 10 central composite trials revealed that the H₂S conversion significantly increases with liquid flow rate but decreases with growing H₂S load up. Further examination about the influence of ferric CDTA on H₂S absorption rate was set up over a broader concentration range (C_Fe,0;0- at pH of 9.5 and 10.5. It showed good potential at as H₂S conversion increased by a significant 25% for both pH values in comparison to pure alkaline solutions containing no ferric CDTA.     

Web2．0技术的现状与应用文献综述

为更好了解Web 2.0技术的现状与应用发展情况,通过以国内调研为基础对Web 2.0技术和应用领域研究的情况作总体分析,以中国知网(CNKI)为信息源,选取有关主题、关键词等进行检索,对Web 2.0研究的文献数量、文献类型和研究主题类型等方面对该领域研究文献做详细分析,并通过随机抽样研究表明,近3年来Web 2.0在教育教学和图书馆等方面的技术应用发展较快,但也存在着研究的主题内容过分的集中、理论研究而缺乏实证、系统深入研究的较少.其研究结果为Web 2.0发展方向提供研究参考,对互联网应用研究者具有一定的参考意义.     

Web2.0环境下电子商务整合应用模型研究

Web2.0的技术和环境为电子商务提供了卓越的发展平台,本文从Web2.0的内涵及应用理念出发,深入探讨多种Web2.0技术在电子商务中的具体应用,并整合Web2.0特征及电子商务活动性质提出了基于Web2.0的电子商务应用模型。     

Web 2.0环境下企业门户用户体验实证研究

以部分知识密集型产业企业样本为数据来源,运用结构方程分析了信息构建、感知有用性、感知易用性和感知享受性因素对B2E门户用户体验的影响。结果表明,信息构建、感知有用性、感知易用性和感知享受性对B2E门户用户体验存在显著的正向影响;信息构建与用户感知有用性、感知易用性和感知享受性因素之间显著相关,具有很强的协同效应;信息构建因素对用户体验存在着间接影响。     

基于VVeb2.0数字环境的本土服装品牌发展策略研究

数字化虚拟经营正成为数字化知识经济时代下创意型本土服装品牌萌芽、发展的主要手段.首先通过对本土服装品牌数字化进程的阶段性划分、归纳以及Web2.0数字化环境的综合分析,总结出本土服装品牌存在的问题;通过分析问题成因及借鉴案例,探讨应对数字化环境的策略,并设计了一套针对性较强的品牌营销方案,以期能够帮助解决一些实际问题.     

基于ARM的双界面IC卡读写器的设计与实现

为满足智能卡在银行、保险、医疗等管理系统的应用需求,设计了一款基于ARM的支持双界面智能卡的读写系统。采用具有ARM Cortex M3内核的STM32F103RBT6和近场通信收发器STRFNFCA等芯片进行相关的硬件设计。软件设计完成了对非接触式卡和接触式卡的底层驱动及应用层通信模块、LCD显示等操作;根据PBOC 2.0标准对智能卡进行金融交易包括圈存、消费、查余额等;同时,读卡器集成了Crypto 1加密算法来兼容市场上的Mifare系列卡。测试结果表明,读写系统性能稳定、功耗低、实用性强、可靠性高。     

运用SPIN对开放授权协议OAuth 2.0的分析与验证

OAuth 2.0协议是一种开放授权协议,主要用于解决用户账号关联与资源共享问题。但是,其弱安全性导致各网络公司海量用户信息泄露,且OAuth 2.0传输数据采用的https通道效率低下,成为黑客攻击对象。提出采用http通道传输OAuth 2.0协议数据,基于Promale语言及Dolev-Yao攻击者模型对OAuth 2.0协议建模,运用SPIN进行模型检测。形式化分析结果表明,采用公钥加密体系对OAuth 2.0协议进行加密不安全。上述建模方法对类似的授权协议形式化分析有重要借鉴意义。     

基于 Activiti 流程管理关键技术设计与实现

Activiti 是用于管理业务流程的工作流引擎,它的使用降低了复杂业务流程开发与维护的难度。但在实际应用中,流程节点无法自由跳转,给管理和使用带来诸多不便。本文研究了 Activiti 中的系统框架和接口,基于现有接口设计实现了流程节点自由跳转功能,并进行了框架整合。测试结果表明,该功能满足各项既定功能需求,具有一般性,可满足实际工作中相关要求。     

基于FT2232H的高速数据采集系统设计

针对各种虚拟仪器对传输速率和开发难度的要求,设计了一种基于新型USB2．0高速接口的虚拟仪器采集系统。本系统采用FTDI公司第五代USB2．0接口芯片FT2232H,利用其异步FIFO接口与STM32F103的FSMC接口相互传输数据,使用LabView设计上位机界面,调用其提供的动态链接库DLL和MCU固件库,可快速实现高速接口的数据传输。     

Developing Faculty ICT Competencies Inside and Outside the Library

Despite all the financial resources that are directed to support and acquire learning technologies, the results have been generally disappointing. Faculty are eager to use technology but lack the technical skills, ability, and experience. Library staff includes a talent tool rich in Information and Communication Technologies (ICT)/WEB 2.0 technical expertise and experience. In terms of content sourcing and procurement, library technical services and selection staff have broad knowledge of the marketplace for online information and content as well as experience in licensing access. They have a firm grasp of the transaction process, workflows, pricing, and licensing negotiations. Content development and sourcing inevitably involves access management, online storage, copyright, and licensing—things at which libraries are good. ICT deployment is changing teaching and learning on campuses, and the roles of those involved in teaching and learning are also changing. Whether formally through mandated library services, or informally through back channels, library staff are supporting faculty new technology use as well as faculty teaching materials content sourcing and procurement.