载体对钯基选择加氢催化剂性能的影响

以常规浸渍法制备了一系列Pd基催化剂，考察载体结构、织构及组成对其加氢性能的影响。采用程序升温技术（TPR-H2、TPDCO）对催化剂进行了表征和相应分析。结果表明，Al2O3载体中以高温1100℃焙烧后形成的占晶型具有更高的乙烯选择性。Pd基催化剂的Al2O3载体预先修饰MgO或CeO2后，能获得良好的金属分散度和适宜的反应物的吸附及产物的脱附特性，使得在高氢／炔体积比下催化剂样品上乙烯收率也维持在80％左右。在非Al2O3型载体制备的催化剂中，与金属Pd存在强相互作用的TiO2载体制备的催化剂的催化性能优越，最优样的乙烯收率达到95％。催化剂表面的Pd^hHx物种和Pd—C结合能在很大程度上影响着H2吸附活化和乙烯脱附能力，这对选择加氢性能有至关重要的作用。     

换热器NH3泄漏的危害及防治措施

2005年8月,中国石油天然气股份有限公司辽阳石化分公司炼油厂第二循环水场水质出现异常情况.经调查分析,发现是脱硫装置E3410A换热器介质NH3泄漏后进入循环冷却水系统所致.介绍了NH3泄漏后的水质变化趋势及危害,并提出了防治措施.     

水力射孔对套管强度的影响研究

水力射孔技术是一种新型的完井方式，深穿透水力射孔技术辅助定向水力压裂可以实现油气层改造和油气井增产。但是，水力射孔套管会在孔眼处造成应力集中，使得局部应力过大而削弱了套管和水泥环的强度，可能会影响套管的使用寿命。因此，文章利用有限元软件建立了射孔套管的三维有限元模型，分析了水力射孔后套管管体的应力分布，重点研究了水力射孔参数-孔密、孔径、孔深、射孔方位角等对套管强度的影响规律。分析结果表明，沿着最大水平地应力方向深穿透水力射孔，选择合适的孔密、孔径可将射孔对套管的损害降至最小。研究结果为提高水力射孔完井设计水平提供了一定的参数依据。     

An MPEG‐4 Compliant Interactive Multimedia Streaming Platform Using Overlay Networks

This paper presents a multimedia streaming platform for efficiently transmitting MPEG‐4 content over IP networks. The platform includes an MPEG‐4 compliant streaming server and client, supporting object‐based representation of multimedia scenes, interactivity, and advanced encoding profiles defined by the ISO standard. For scalability purposes, we employ an application‐layer multicast scheme for media transmission using overlay networks. The overlay network, governed by the central entity of the network distribution manager, is dynamically deployed according to a set of pre‐defined criteria. The overlay network supports both broadcast delivery and video‐on‐demand content. The multimedia streaming platform is standards‐compliant and utilizes widespread multimedia protocols such as MPEG‐4, real‐time transport protocol, real‐time transport control protocol, and real‐time streaming protocol. The design of the overlay network was architected with the goal of transparency to both the streaming server and the client. As a result, many commercial implementations that use industry‐standard protocols can be plugged into the architecture relatively painlessly and can enjoy the benefits of the platform.     

3G网络中的IPv6 DNS服务器配置

说明了3G网络中IPv6递归DNS服务器地址配置的三种方法：路由器通告（RA）方案，DHCPv6方案，递归域名系统（DNS）服务器的公认任播地址方案，详细地说明了三种解决方案的操作特点。本文为3G中选择合适的方法进行主机DNS配置提供了指导。     

H.264/AVC技术进展及其务实发展策略思考

结合NGN及3G演进的固定、移动视频业务实际需求状况，论述H．264／AVC的重要技术进展及其务实发展策略。     

3G标准的技术性比较分析与研究

介绍了3G技术在国内外的发展情况，阐述了发展趋势，对3G技术的分类和所采用的主流技术、标准化情况进行了论述，并对CDMA2000，WCDMA和TD-SCDMA三种3G的三大主流应用技术标准进行比较分析。     

基于实际井眼轨迹的抽油杆柱API设计方法

目前的抽油杆柱设计方法大都基于设计井眼轨迹或经验公式，因此设计的抽油杆柱与井眼的匹配性并没有达到最优，结果可能影响了抽油杆柱的受力特性和寿命。概述了目前现有的抽油杆柱设计方法，提出了基于实际井眼轨迹的抽油杆柱API设计方法，即考虑到在三维空间中井下粘滞阻力及动载的影响，利用微单元分析方法计算出轴向载荷与轴向应力，然后在此基础上进行杆柱组合设计，并给出了设计流程。以江苏油田永21-3井为例，对几种设计方法的设计结果进行了对比分析，结果表明，江苏油田目前采用的抽油杆柱设计方法包含了人为经验因素，并不是最优的杆柱设计结果，有待进一步改进。     

Ring‐opening polymerization of lactones initiated by diphenylzinc–coinitiator systems

Diphenylzinc, alone or in combination with water and butanone as coinitiators, was used as a polymerization initiator system for a variety of lactones at varying temperatures. The resulting data indicate that the course of the polymerization is greatly influenced by the lactone structure, as well as by the molar ratio of coinitiator to diphenylzinc. When used alone, diphenylzinc exhibited high activity as an initiator in δ‐valerolactone polymerizations, although it was less efficient when used in the β‐butyrolactone and the β‐propiolactone polymerizations. Activity in the polymerization of β‐lactones was increased by adding small amounts of butanone or water. It was also observed that the diphenylzinc–butanone combination was more effective than the diphenylzinc–water mixture in the polymerizations of β‐butyrolactone and β‐propiolactone. Copyright © 2003 Society of Chemical Industry     

HB-3、HB-4型钴钼触媒升温硫化总结

总结了HB - 3,HB - 4型钴钼触媒升温硫化过程及注意事项 ,简单介绍了使用情况 ,并针对出现的问题采取了一定措施