一种铁屑协同花生壳处理中高浓度玛瑙染色废水的治理技术

针对某地玛瑙加工企业排放的玛瑙染色工业废水成分复杂的特点,采用了一种铁屑协同花生壳处理玛瑙染色废水的处理工艺。工程实践证明,该工艺系统对中高浓度玛瑙染色废水处理效果较好,运行稳定高效,对Cr(Ⅵ)、SO42-平均去除率可达到96%和50%～70%以上,且对原水浓度变化的适应能力较强,出水水质达到《污水综合排放标准》(GB8978-1996)中相关行业二类排放标准。     

沸石—地聚合物复合多孔材料制备及其二氧化碳吸附性能研究

通过固体吸附剂捕集CO₂,是CO₂捕集和封存技术中最为有效的手段之一。以粉煤灰和矿渣为原料,通过碱激发剂、发泡剂、稳泡剂制备出具有发达孔隙结构的固废基地聚合物复合多孔材料。采用正交试验对复合多孔材料配比进行优选,制备出抗压强度达到15.395 N,CO₂吸附量为156.28 cm³/g的地聚合物复合多孔颗粒。在优选方案的基础上,将13X分子筛、4A分子筛、斜发沸石三种不同类型沸石添加到地聚合物基质中,制备出沸石—地聚合物复合多孔材料。添加沸石后,抗压强度有所降低,但比表面积和孔体积均提高,CO₂吸附性能明显改善。其中,添加13X沸石后性能最优,CO₂吸附量达到602.43 cm³/g,较未添加沸石的复合多孔材料的CO₂吸附能力提高了约3.2倍。     

工业废水冲击对城镇污水处理系统影响的实验研究

为考察工业废水冲击对城镇污水处理厂正常稳定运行的影响,在模拟城镇污水处理系统中实施实际工业废水冲击,分析冲击中系统运行性能变化,并采用共代谢效应和生物刺激效应对冲击后系统进行运行恢复。冲击结果表明,工业废水冲击会造成污水处理系统的运行性能下降,特别是氨氮去除性能明显降低;同时,工业废水冲击的影响通常是暂时且可逆的,即使长时间冲击后亦可通过运行调控加以恢复。不同类型工业废水冲击的影响差异明显,高浓度印染废水和低可生化性化工生化出水冲击对运行性能的影响较大,而工业园区综合废水可生化性较高,冲击影响较小。运行恢复结果表明,投加复合营养液,利用共代谢效应和生物刺激效应可以应对不同类型的工业废水冲击,且具有快速、有效的运行恢复效果。     

X型沸石/活性炭吸附剂的改性对甲烷的吸附分离研究

本文制备了沸石和活性炭配比不同的X型沸石/活性炭吸附剂,以Freundlich模型拟合吸附剂对甲烷的吸附等温线,探究含碳量对甲烷吸附性能的影响。用NH_4~+交换法对该吸附剂改性,考察改性后吸附剂对二氧化碳、氮气、甲烷的分离性能。研究表明,该吸附剂对CH_4的吸附量随含碳量的增加而增加;改性后吸附剂对CO_2、N_2的吸附量降低,对CH_4的吸附量增加,CH_4/N_2、CH_4/CO_2分离比提高,更有利于CH_4的分离提纯。     

印染废水处理技术简介

印染行业是工业废水排放大户,据不完全统计,全国印染废水每天排放量为3×106～4×106m3。印染废水具有水量大、有机污染物含量高、色度深、碱性大、水质变化大等特点,属难处理的工业废水。开发经济有效的印染废水处理技术已成为当今环保行业关注的课题。一般来说,印染废水的处理方法主要有四种,物理处理法、化学处理法、生物处理法、碱减量处理法。物理处理吸附法:这种方法是将活性炭、粘土等多孔物质的粉末或颗粒与废水混合,或让废水通过由其颗粒状物组成的滤床,使废水中的污染物质被吸附在多孔物质表面上或被过滤除去。活性炭吸附法对去除…     

不同灌溉方式及施氮量对水稻产量的影响评估

为建立综合、高效和可持续发展的农业生态系统,研究了4种不同氮肥施用水平下控制灌溉与常规灌溉(淹灌)对水稻产量、水分利用效率和氮素吸收利用效率的影响,并采用土壤蒸渗仪观测了20和60cm土壤深度处氮素的淋失量,研究结果表明:灌溉方式和施氮量对水稻产量具有显著影响,控制灌溉的水稻产量高于淹灌,其增产范围为3.16%～11.79%;高施氮量氮素的淋失量总是大于低施氮量,土壤中NO~-_3-N的浓度高于NH~+_4-N的浓度,且随时间的变化趋势具有很强的变异性;控制灌溉方式可减少氮素淋失量,增加氮素吸收利用效率和水分利用效率,同时可增加N_2O的排放通量。     

皇竹草生物炭基质对垂直流人工湿地处理城市污水厂尾水中COD的影响

人工湿地系统已被用于处理各种生活污水和工业废水,是一种具有较高经济效益和环境效益的污水处理技术,尤其适用于农村污水处理。系统中填料在湿地污水处理过程中起着重要的作用。本文通过对传统湿地的一般操作和处理问题的分析,设计了不同的人工湿地基质对农村生活污水进行处理。在使用同种植物的基础上,选用,即麦饭石,钢渣,竹炭和石灰岩基质构建人工湿地系统,研究它们的效果。结果表明,四种不同的填料的组合对农村生活污水污染物的去除效果良好。以上四种填充物的理论最大吸附能力强弱对比:麦饭石>钢渣>竹炭>石灰岩。废水水质符合《市政污水处理厂污染物排放标准》一级排放标准(gb18918-2002)。基质填料的选择对人工湿地污水处理系统的运行结果具有重要的意义。     

保险粉废水高效处理技术研究

保险粉废水是一种处理相对困难的工业废水,含有大量的有机物、氮、磷等污染物,如果不进行处理,将对水环境造成严重损害。本文提出保险粉废水的高效处理技术研究。首先,用混凝沉降技术对保险粉废水进行预处理;其次,利用高级氧化技术处理难以生物降解的有机物;再次,利用水解酸化技术对厌氧微生物进行水解和酸化作用;最后,采用两级SBR反应器处理厌氧出水。根据以上步骤,可以有效去除废水中的悬浮物、色度、总磷等污染物,使废水达到排放标准。     

环形A/O生物滤池处理城市生活污水

介绍了山西阳泉污水处理厂环形A/O生物滤池的特点,并结合该厂污水处理工艺流程和主要工艺参数对实际运行情况进行了论述。运行结果表明:环状生物滤池较普通生物滤池对进水的水质水量有更大的耐冲击能力,除磷脱氮效率高40%~50%;经过二级处理,出水能够达到排放标准,三级处理后可作为中水回用。     

光合细菌法在工业废水处理中的应用

介绍了光合细菌(PSB)的生物学特征及净化废水的机理,从PSB法处理工业废水的特点、典型工艺及应用实例等方面,对光合细菌法在处理食品、制药、制革等生产过程中产生的高浓度有机废水中的应用作了较系统的概述,并探讨了PSB法技术的发展趋势。     

Divergent patterns of engagement in Internet standardization: Japan,Korea and China

This article analyzes the engagement of Japanese, Korean and Chinese participants in the development of Internet standards at IETF on the basis of four quantitative metrics: attendance, patenting, authorship and leadership. The results are strikingly divergent. Japanese involvement in Internet standardization began early and Japan was, for many years, second only to the U.S. in terms of IETF participation. Though Japanese participation has declined since the early 2000s, Japan remains a major contributor to IETF standardization. Korean involvement in IETF has always been significant, but below the levels of Japan and major European countries. Korean participation in IETF has also declined over the past decade, and has been dominated by one firm, Samsung. Though meaningful Chinese involvement in IETF did not begin until the mid-2000s, it has rapidly expanded in recent years. Today, China is a major player in numerous areas of Internet standardization in terms of three metrics (participation, patenting and leadership), and is rapidly gaining in terms of document authorship as well. Most of China׳s recent IETF involvement can be attributed to Huawei, though other Chinese firms have recently begun to increase their participation in the organization. Thus, contrary to some views that China׳s engagement with standardization is primarily one of indigenous innovation and “catching up”, China׳s experience with IETF demonstrates deliberate and effective engagement with a major Western standards-development organization on its own terms.     

增强Linux系统安全性的措施

L inux系统的安全取决于系统管理员如何来管理它。本文探讨了一系列可以增强安全性的技巧与策略 ,包括 :系统安装原则、BIOS安全、口令安全策略、设计帐户自动注销功能、文件系统和日志安全策略、使用 SSH及 TCP-WRAPPERS,隐藏系统信息、删除所有特殊帐户、关闭控制台程序、限制系统中的 SUID/ SGID程序等。本文最后向 L inux系统管理员提出了一些安全管理方面的建议     

快速成形技术的应用及热点分析

基于快速成形技术的原理,展示了快速成形技术在快速模具制造、金属零件直接成形、反求工程等领域的广泛应用,总结了快速成形制造技术研究的热点,即研发新材料和新设备、提高成形精度、建立RPM的反求工程系统、建立成形技术的统一标准和扩大成形技术的应用领域。     

Whose Image is it Anyway?: Some Considerations of the Curricular Importance of Subject Image in Secondary School Design and Technology Education

This paper explores the idea that a sense of school subject image is a necessary feature of curriculum management and a potent force for change. The discussion centres on the view that all school subjects have an image and that if those intimately involved with the subject do not control the image then someone else does! In such circumstances the image is the product of past encounters and old euphemisms and is unlikely to hold the changed realities.The UK developments in Design and Technology education (the term Design and Technology is used to denote the school subject defined under this heading by the UK National Curriculum, 1995) have created something of an image problem which has interesting international parallels. Some of these problems are due to clearly discernible internal tensions and an ambiguous relationship with other subject areas.Through greater attention to subject image internal controversies might be acknowledged and resolved, relationships with other subject areas can be more meaningfully understood and practitioners can be helped to make sense of curriculum change.     

CIS与现代企业管理美学

概括性介绍了 ＣＩＳ（Ｃｏｒｐｏｒａｔｅ Ｉｄｅｎｔｉｔｙ Ｓｙｓｔｅｍ）的三大基本组成，并阐述了它与现代企业管理密不可分的相互联系及所处的举足轻重的地位，指出导入ＣＩＳ是现代企业谋求发展的重要手段。     

HSE走进中国石油

企业管理水平的好坏直接影响着企业的经济效益,运用HSE管理能提高企业管理水平,HSE管理模式将健康,安全,环境三者视为一个有机的整体。HSE管理认为人的安全是第一位的,人是创造财富的原动力,是企业的最大财产,HSE管理体系强调的是“蝴蝶效应”。     

Material power and normative conflict in global and local agrifood governance: The lessons of ‘Golden Rice’ in India

This special section aims to investigate the interaction of global and local forces in shaping agrifood governance. It starts from the recognition that a multitude of actors and norms shape today’s agrifood system. The resulting opaqueness of the systems makes it extremely difficult to understand and explain processes and outcomes of agrifood governance. Given the sustainability challenges facing the agrifood system, improvements in our understanding of what the interaction of global and local actors and norms means on the ground are urgently needed, however. The section, therefore, analyses agrifood governance in India across a selected group of cases. It does so by employing a systematic framework emphasizing the material and ideational dimensions of power and their interaction. The section has chosen India as the setting in which to analyze this interaction due to the crucial role the food demand and supply of this rising power plays in today’s agrifood system. This article provides the special sections’ analytical framework, which uses the interplay of material and ideational dimensions of power as a focal lens. In addition, the article applies this framework to an empirical study of the political conflict around GMO foods in India, specifically the case of ‘Golden Rice’.     

Diffusion and usage of public e-services in Europe: An assessment of country level indicators and drivers

We analyze the state of the art of indicators on e-government, e-health, e-procurement and e-participation. We survey the main methodological properties of these indicators, and highlight their heuristic potential. Further, we address empirically the issue of the explanation of the availability scores, i.e. how the supply of the various e-services in each country is affected by political, institutional and socio-economic differences, and is followed by actual usage. The econometric analysis uncovers the importance of broadband penetration and higher education as drivers for most of the types of e-services and users (citizens and businesses). Moreover, a corruption-free and agile public sector proves to be an important pre-condition for more effective supply and usage. Despite data limitations and the complexity of the underlying diffusion phenomena, our study is the first truly longitudinal contribution aimed at disentangling the common drivers of such an important phenomenon – the e-services availability and usage across European countries. As such, this work appears useful to inform the policy debate and practice, in a phase characterized by a prospective reorientation of the public e-services provision and policy agenda.     

一种高精度的频率标准比对系统

频率标准源可以提供精确的标准频率,在测定频率标准源的各项性能指标时,要求测试系统必须具有很高的比对精度。所设计的频率标准比对系统采取多级倍频 混频方式使频率偏差逐级扩大后再测量,从而避免了直接进行高次倍频的困难,提高了测量精度,可以对高精度的频率标准的准确度、长短期频率稳定度进行快速测量,是一种高精度时畴参数测量系统。     

蒸汽热量计量应用的探析

研究了石油化工企业的燕汽计量情况,着重对蒸汽热量计量的合理性进行了分析,阐述了蒸汽热量计量的依据及计算方法,以及蒸气热量计量对节能降耗的重要意义.