铁基粉末冶金零件粉末渗硼的研究

本文介绍有关铁基粉末冶金零件粉末渗硼的研究结果。通过对不同含碳量、不同密度的铁基粉末冶金零件进行粉末渗硼试验,研究了渗层的耐磨性和耐蚀性,试验结果表明,铁基粉末冶金零件粉末渗硼是一项改善表面性能并有实用价值的化学热处理工艺。     

泄漏分析及改进渣油泵机械密封

我厂有两台8sh-9型渣油泵，负责冬季渣油外输工作。该泵原来轴封采用填料密封，由于泄漏量大，污染环境，后改为G×60型机械密封，动环采用YG6硬质合金，静环为DM-4石墨环，密封圈采用O型橡胶密封圈。运行一段时间后效果不理想，经常发生泄漏现象，不但增加了维修费用，而且影响了正常的渣油外输。针对这种情况，我们对其进行了分析改进。     

渣油泵机械密封泄漏分析及改进

我厂有两台8sh-9型渣油泵,负责冬季渣油外输工作。该泵原来轴封采用填料密封,由于泄漏量大,污染环境,后改为G×60型机械密封,动环采用YG6硬质合金,静环为DM-4石墨环,密封圈采用O型橡胶密封圈。运行一段时间后效果不理想,经常发生泄漏现象,不但增加了维修费用,而且影响了正常的渣油外输。针对这种情况,我们对其进行了分析改进。 一、泄漏分析 从密封泄漏现象看,大体分为以下两种。 1.泵在运转过程中发生泄漏。机泵运行一段时间后经常发生泄漏,而此时泵的运行状况和各项参     

硼交联羟丙基瓜尔胶压裂液回收再用可行性研究

本文以硼交联羟丙基瓜尔胶压裂液回收再利用的可行性作为研究目的,以PH值、温度和破胶液粘度所能达到的最低基液水平为具体控制因素,分析了硼交联与非降解性破胶机理,并对硼交联羟丙基瓜尔胶压裂液的反排监测方法进行了具体研究,从而说明了硼交联羟丙基瓜尔胶压裂液的重复利用可以有效提高压裂液的增产效果。     

氨基酸表面活性剂结构和性能关系

文章对氨基酸表面活性剂结构和性能关系进行了研究,为产品应用提供参考。AG02-95通过控制其中和度,或通过高低碳链复配可调控溶解性和结晶性能;YC02H-30、YG02-30、YB02-30、YN02-30在近中性条件下均表现出优异的泡沫丰富度和稳定性;YGTEA-30在pH值5.5时具有更优异的泡沫表现,更适合透明配方;YC02H-30适合pH值>6.8的配方,YC03H-30更加适合pH值5.5～6.8的配方;YC03-30和YN02-30较AS02-30和YG02-30具有更加优异的增稠表现。     

提高气门模具使用寿命的盐浴软氮化应用研究

本文分析了3Cr2W8V 钢制气门模具的主要失效形式。型腔不耐磨及微量塑性变形是模具使用寿命低的根本原因,在保证基体强度和韧性的条件下,采用方法简便的盐浴软氮化处理,可有效地提高耐磨性,其使用寿命提高1.1～1.9倍。本文还分析了此种方法处理后的性能、特点及该方法的应用前景。     

新型压裂液用有机硼交联剂的合成与性能

在实验研究过后,主要对有机硼交联剂ABE-30进行合成,利用核磁氢谱、核磁硼谱和红外光谱对ABE-30进行了分析和表征。推测产物具有团簇配位化学结构,研究了ABE-30交联剂和瓜胶溶液的交联性能,并详细的研究了交联体系的耐温性和抗剪切性。最终的结论能够发现与传统硼酸钠交联剂相比,交联剂ABE-30能有效地与低浓度的鸟嘌呤胶粘剂交联,交联系统有着非常好的热稳定性和抗剪性能,在今后的运用中有很好的运用效果。     

高速线材精轧辊破坏的分析

高速线材精轧机组采用集体传动、十架连轧,出口速度为70m/s。普通钢铁轧辊易磨损,轧制时难于保证连轧关系,且产品精度较低,而硬质合金轧辊以碳化钨作为基体材料,以金属钴或钴和镍为粘结材料制成,具有硬度高、耐磨损的性能,被广泛应用于高速线材精轧机组。但碳化钨轧辊在使用过程中很易碎裂,通过对碎裂原因进行分析,试图找出减少碎裂的途径。     

镇泾油田长8段储层压裂液体系优选研究

镇泾长8油藏储层沉积环境复杂,储层物性差、岩性致密、孔喉细小,泥质含量高,储层平面及纵向非均质性强,油层薄、夹层多,储层流体流动困难,需要在确定储层工程地质特征的基础上,有针对性的优化改进压裂技术。本文以镇泾长8段为例,对在用压裂液进行性能和伤害研究,优化液体的配方。结果表明：优化的低成本低伤害压裂液体系,能够满足压裂施工要求,岩芯伤害率小于25％,且成本得到进一步降低;优化后的压裂液体系较优化前岩芯伤害率更低,伤害率仅24．3％。现场应用效果较好。     

氮杂氟硼二吡咯类荧光染料专利综述

氮杂氟硼二吡咯类(aza-BODIPY)染料因其优异的荧光性能及结构易于修饰的特性,在生物检测、太阳能电池、荧光探针、医学领域等领域有着广泛的应用。文章从氮杂氟硼二吡咯自身的用途等仅对专利文献进行梳理,分析了其产业中存在的问题及解决方案。     

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     

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。     

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”。     

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。     

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.