复合纳滤膜对水体中PFOS的截留率及通量的影响

复合纳滤膜对PFOS浓度为(50~500)×10~(-6)的截留率能达到80%以上。尤其当膜中活性炭的添加量为0.5%时,纳滤膜对浓度为50×10~(-6)的PFOS截留率达到98%,性能优于无添加活性炭的纳滤膜。实验中添加活性炭的复合纳滤膜可以有效的去除水体中的PFOS。     

管式膜超滤-纳滤联合法处理糖精钠生产废水

考察了管式膜超滤及纳滤在糖精钠生产废水处理过程中的膜通量、出水水质以及纳滤对废水中的硫酸钠和氯化钠的分离效果。纳滤可以有效分离废水中的Cl~-和SO_4~(2-),不同压力下对SO_4~(2-)的截留率均高于90%,且对Cl~-呈现"负截留"。     

PVA/PEI共混膜对碳酸二甲酯与二氧化碳体系的分离效果研究

根据碳酸二甲酯/二氧化碳(DMC/CO_(2))系统研究有较好分散作用的膜,选择聚乙烯亚胺(PEI)用作膜中输送二氧化碳的媒介物质。在通常情况下,该薄层材料对纯超临界二氧化碳系统的通量伴随聚乙烯亚胺浓度的上升而加大,对DMC/CO_(2)系统的渗透通量伴随聚乙烯亚胺浓度的上升、压力差的增大和环境温度的上升而加大,对DMC/CO_(2)系统的穿透通量则伴随聚乙烯亚胺浓度的上升、压力差的增大和环境温度的提高而加大,分散作用也随聚乙烯亚胺浓度变化,但随压强变动不大,随温度的升高而减小。当温度为30℃,最大压强差为0.5 MPa,而在20℃时,当聚乙烯亚胺的浓度超过40%,膜厚度为35μm时,分离因子为36,最大渗透通量为4.8 g/(m^(2)·h)。     

曝气生物滤池在印染废水处理中的应用

本文进一步研究印染厂废水处理中应用曝气生物滤池将排放口出水进行再回收利用,对处理结果进行了观察和分析。经结果显示,曝气生物滤池在水里负荷为1.03m3/(m2·h)时,COD的去除率为31.1%,通过纳滤预处理后,机械过滤和混凝沉淀的出水浊度和SDI值分别约是1.66NTU和4.2;回收纳滤系统中时间延长而导致降低水质的回收率,压力差因此会升高;纳滤系统在进水3750~4280mg/L的TDS中,拖延率平均为96.2%;化学清洗后的水回收率有92.60%可恢复系统运行初期,而拖延率在清洗前、后的变化不明显。应用曝气生物滤池处理后再回收利用站排放口出水的效果非常显著。     

中试MBR+RO组合工艺深度处理化工废水研究

为了降低新鲜水的需求量,缓解水资源压力,对某化工园区污水处理厂进行了提标改造及再生水回用。以混凝沉淀+A~2/O为预处理工艺,构建中试MBR+RO组合系统,深度处理及再生利用化工废水,考察了MBR工艺作为RO预处理的可行性以及组合系统的处理性能,分析了MBR膜组件及RO膜组件的污染情况,评价了最终处理成本。研究表明,废水经过混凝沉淀+A~2/O预处理后进入MBR+RO组合系统,最终出水ρ(COD)≤10 mg/L,ρ(NH~+_4-N)≤2 mg/L,ρ(SS)≤1 mg/L,ρ(TP)≤1 mg/L,水质达到城市污水再生利用工业用水标准(GB/T 19923-2005);MBR膜跨膜压差稳定在18 kPa,说明没有发生膜污染;RO膜渗透系数稳定在4 L/(min·MPa),也没有发生污染;中试系统吨水电耗为1.890 kW·h。高性能再生水水质具有明显优势,降低了企业的运行成本。     

东风Honda CR-V锐·混动e+ 混动技术再进化

CR-V锐·混动e+搭载SPORT HYBRID e+混动系统,2.0L阿特金森循环发动机最大功率107kW,最大扭矩为175N·m;电动机的最大功率为135kW,最大扭矩为315N·m。匹配E-CVT双电机变速箱,综合油耗为1.3L/100km,纯电续航里程达85km。     

东风HondaCR-V锐·混动e+

CR-V锐·混动e+搭载SPORT HYBRID e+混动系统,2.0L阿特金森循环发动机最大功率107kW,最大扭矩为175N·m;电动机的最大功率为135kW,最大扭矩为315N·m.匹配E-CVT双电机变速箱,综合油耗为1.3L/100km,纯电续航里程达85km.     

曝气生物滤池深度处理印染废水的实验研究

采用曝气生物滤池(BAF)对经生化预处理后的印染废水进行中试规模的深度处理实验研究,考察了水力负荷、进水有机负荷和滤层高度对污水化学需氧量(COD)和总磷(TP)的去除效果。结果表明:当BAF进水水力负荷为2.5 m3/(m2·h),气水比为2∶1,进水COD和TP质量浓度分别为77.7~102 mg/L和0.872~0.957 mg/L范围变化时,COD和TP平均去除率分别达到了47.9%和46.0%,出水水质满足《城镇污水处理厂污染物排放标准》(GB 18918—2002)一级A标准。     

正渗透膜处理城市生活污水实验研究

为分析正渗透膜技术应用于城市污水处理实践效果,取城市排污口调节水池中污水为水样,采用TFC-ES正渗透膜设备进行实验分析,通过调整正渗透膜的放置方向分析了水通量和氨氮的透过量的变化过程,实验表明两种放置方向下截留率都超过了90%,反应出仅仅通过真渗透膜来进行污水处理,对生活污水中的氮处理效果较好,也验证了利用海水作为驱动液的可行性。     

UASB处理甲苯氧化废水试验研究

采用UASB反应器处理甲苯氧化废水,接种颗粒污泥,当进水ρ(COD)为6 000 mg/L,运行负荷(以COD计)为6 kg/(m3.d)时,COD去除率达到84%左右,出水ρ(COD)为853~985mg/L,其适宜的运行条件为进水pH值为5~6,ρ(COD)为5 000~6 000 mg/L,水力停留时间为24 h,容积负荷(以COD计)为5~6 kg/(m3.d)。通过对污泥的培养驯化和合理的运行方式,甲苯对厌氧消化的抑制影响可以得到很好的控制。     

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.     

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.     

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。     

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     

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”。     

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。     

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’.     

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.     

论传统旗袍文化与现代时装

中国的旗袍文化蕴含着非常丰富的文化内涵和设计思想,如今旗袍的普及受到一定的限制,只有经过改良,才可变局限性为可行性,才可使旗袍焕发青春,走向新时代。     

望峰岗矿井贯通测量技术分析

在深部开采矿井两井间贯通测量时,利用加测陀螺定向边和用四架法代替传统的三架法测量,分析了由起始边的方位角误差引起的支导线终点误差及由测角量边引起的导线终点的点位误差.