Adsorption of basic dyes onto MCM-41

The adsorption of two basic dyes, Basic Green 5 (BG5) and Basic Violet 10 (BV10), onto MCM-41 was studied to examine the possible effect of interactions between large adsorbates and MCM-41 on the pore structure stability of MCM-41 and the potential of MCM-41 for the removal of basic dyes from wastewater. The revolutions of surface characteristics and pore structure of MCM-41 induced by dyes adsorption were characterized based on the analyses of the nitrogen isotherms, the XRD patterns, and the FTIR spectra. It was experimentally concluded that when the effect of interactions between large dyes (such as BV10) and MCM-41 on the pore structure stability of MCM-41 was insignificant, MCM-41 might be a good adsorbent for the removal of basic dyes from wastewater. The adsorption of BV10 on MCM-41 with respect to contact time, pH, and temperature was then measured to provide more information about the adsorption characteristics of MCM-41. Both Langmuir and Freundlich adsorption models were applied to describe the equilibrium isotherms and the pseudo-second-order kinetic model was used to describe the kinetic data, from which some adsorption thermodynamic parameters were also evaluated.     

Fuzzy risk assessment of oil and gas offshore wells

Risk evaluation of offshore wells is a challenging task, given that much of the available data is highly uncertain and vague, and many of the mechanisms are complex and difficult to understand. Consequently, a systematic approach is required to handle both quantitative and qualitative data as well as means to update existing information when new knowledge and data become available. Each Basic Risk Item (BRI) in a hierarchical framework is expressed as a fuzzy number, which is a combination of the likelihood of a failure event and the associated failure consequence. Analytical Hierarchy Process (AHP) is used to estimate weights required for grouping non-commensurate risk sources. Evidential Reasoning (ER) is employed to incorporate new data for updating existing risk estimates. It is envisaged that the proposed approach could serve as a basis for benchmarking acceptable risks in offshore wells.     

Creating Defensible Space in the Wildland–Urban Interface: The Influence of Values on Perceptions and Behavior

We examined the effect that value orientation to forests and wildland fire management has on an individual’s decision to create defensible space around his or her residence in the wildland–urban interface. Using data from a mail-back questionnaire, respondents in north central Minnesota were clustered by basic value–laden beliefs toward forest and wildland fire management and compared across a number of perceptions and behaviors related to creating defensible space around residences. Value orientation groups differed in attitudes, subjective norms, and perceived behavior control toward creating defensible space. In addition, relative effects of these perceptions on intention to create defensible space differed across groups. Implications lie in (a) understanding differences in motivations and reasons for support of strategies for managing fires near the wildland–urban interface, (b) developing information designed to address the perspectives of different groups related to creating defensible space, and (c) contributing to an improved integration of land management and public concerns and interests.     

伤亡事故统计分析信息管理系统的开发

利用Visual Basic语言和Microsoft Access数据库相结合的技术,建立伤亡事故统计分析信息管理系统,对企业历年来发生的伤亡事故进行统计分析从而预防事故的发生.     

用VB开发电子阅览室登录计费系统

介绍了基于VB SQL SERVER电子阅览室登录系统的设计与实现.从数据库设计、操作过程等方面讨论了所遇到的并解决的关键问题:登录功能的实现,语音功能、上机计时收费、打印收费功能以及各种统计查询功能的实现等,形成了一个完整的,功能较为齐全的,安全性和工作效率较高的电子阅览室登录系统.     

Removal of Methylene Blue from aqueous solution by marine green alga Ulva lactuca

Biosorption of colours is an important technology for treatment of different types of industrial wastewaters containing dyes. The objective of this study was to convert green alga Ulva lactuca to dye adsorbents for wastewater treatment. The importance of commonly available green alga Ulva lactuca was investigated as viable biomaterials for the biological treatment of synthetic basic blue 9 (5-ch1oro-N,N,N^',N^'-tetramethyl-5λ⁴-phenothiazine-3,7-diamine) effluents. The results obtained from the batch experiments revealed the ability of the green algae to remove the basic blue 9, and this was dependent on the dye concentration, pH, and algal biomass. We investigated the equilibrium and kinetics of adsorption, and the Langmuir and Freundlich equations were used to fit the equilibrium isotherm. The adsorption isotherm of basic blue 9 followed both the Langmuir and Freundlich models with a correlation coefficient of ∼0.96-0.99, and the adsorption kinetics followed the pseudo-second-order model (R²=1.0). The maximum adsorption capacity was about 40.2 mg of dye per gram of dry green algae at pH 10, 25 g l^-1 dye and 2.5 g l^-1 alga concentrations. This study demonstrated that the green algae could be used as an effective biosorbent for the treatment of dye-containing wastewater streams.     

浅谈基层监测站"十二五"能力建设方向

依据环境监测能力建设标准,提出了"十二五"期间基层监测站能力建设的目标和要求,指出实现"三个说得清",应以科研工作为先导,以污染防治为核心,以信息化建设为载体,强化对环境质量综合分析和环境风险源筛分排查,充分发挥基层监测站的作用,更好地为环境管理提供准确有效技术支持的建设思路.     

区域自然灾害系统基本单元：研究—Ⅰ：理论部分

本文在区域自然灾害系统论的基础上提出了组成区域自然灾害系统的最小空间单位——区域自然灾害系统基本单元的概念体系，解决了区域自然灾害系统研究中的最小空间均质单位问题。进而提出了应用ＧＩＳ技术划分不同空间尺度下基本单元、提取与基本单元相匹配的不同类型的属性数据的方法，使不同来源的数据在基本单元中得到统一的表达，解决了区域自然灾害研究中以自然单元为基础的数据与以行政单元数据相匹配的问题，为区域自然灾害研究向定量化方向发展奠定了基础。     

基础研究与林火实践

通过介绍森林火灾的双重性分析森林火灾的几个典型现象,探讨了如何对森林火灾进行基础研究和模拟实验。并从着火过程,林火行为,阻炎林带的阻火机理三个方面论述了基础与林火初中之间的关系。     

具反硝化能力的氢细菌特性及其应用

系统地将具有反硝化能力的氢细菌基本特性作了总结，并讨论了其生物膜的培养方法和其在水处理上的应用。