Influence of Polyalkylmethacrylate VII on Boundary Film Formation,Friction,Wear and Efficiency of Lubricants

1 Influence of PAMAon Boundary Fil mFormation and Friction1.1 Experi mental methodsUltra-thin optical interferometry has been used tostudy thinlubricating fil ms for more than a decade and theexperi mental details of this technique have been reportedpreviously[1].The principle of the test setup is shown inFigure1.A polished steel ball is loaded and rolled againstthe flat surface of a glass disc that is coated with a thinsemi-reflecting chromiumlayer and a silica spacer of about500nmthickne…     

The INTELSAT VII/VIIA generation of global communications satellites

Developed primarily to provide continuation of services from the INTELSAT V satellites in the Pacific Ocean Region, this latest generation of satellites also has utility for operation in other roles. Several new technologies are combined to give cost-effective international satellite communications on a global, regional and domestic basis. This new higher power satellite will form a fundamental part of the INTELSAT global network, having been designed to match the projected traffic demands and future service requirements.     

锇(Ⅷ)-N-(8-喹啉基)-N’-苯甲酰基硫脲(QBTU)络合物吸附波的1.5次微分极谱研究

于0.025mol/LNaOH溶液中,Os(Ⅷ)-QBTU体系产生—明晰的极谱波,其1.5次微分峰电流与浓度在1.0×10~(-7)～4.0×10~(-5)mol/L范围内呈线性关系。研究了极谱电流的性质、反应机理及电极过程等后确认:络合物的组成为[OsO_4(OH)_2·QBTU]·Na_2并吸附于滴汞电极表面,配体QBTU在不离解出的情况下发生电还原,获得络合物吸附波,电极过程不可逆,[OsO_4(OH)_2·QBTU]~(2-)离子的条件稳定常数8.5×10~5。     

Adsorption and separation of rhenium(VII) using N‐methylimidazolium functionalized strong basic anion exchange resin

BACKGROUND: Rhenium is a rare and valuable metal coexisting with molybdenum in molybdenite and sulfide copper ores and is hard to separate. Methods such as solvent extraction, ion exchange, adsorption, precipitation, etc. have been used to separate and purify Re(VII), and resin ion exchange has been widely investigated and used owing to its convenient operation and relatively low‐cost. The main challenge comes from the preparation of resins having high performance and stability. In an earlier study, an N‐methylimidazolium functionalized strong basic anion exchange resin was successfully synthesized and used for Cr(IV) extraction. This paper, reports on further synthesis and application of this resin for adsorption and separation of Re(VII) and Mo(VI), especially from copper arsenic filter cake. RESULTS: At pH 6.25, Re(VII) and Mo(VI) can be effectively separated with the N‐methylimidazolium functionalized strong basic anion exchange resin, giving a Re(VII) recovery of up to 93.3%, but only 5.1% for Mo(VI). When using the copper arsenic filter cake sample 89.1% Re(VII) recovery was achieved. CONCLUSION: The N‐methylimidazolium functionalized strong basic anion exchange resin exhibited high selectivity and recovery for Re(VII) in a mixed system. © 2012 Society of Chemical Industry     

分散抗氧型乙丙共聚物结构表征及其在内燃机油中的使用情况

乙丙共聚物粘度指数改进剂（OCP）目前正由单般向双般、多效发展，这对提高内燃机油质量具有一定意义。文章介绍了分散抗氧型乙丙共聚物粘度指数改进剂的结构表征并对其在内燃机油中的使用情况进行了评价。     

Implementation of intelsat IDR operation

Over the next few years INTELSAT IDR carriers are expected to replace analogue FDM/FM carriers carrying trunk public switched telephony traffic. This paper describes the activities necessary to implement INTELSAT IDR operation into an existing or new earth-station. The operational planning aspects discussed include the initial traffic and marketing forecasts to determine the IDR carrier requirements, use of DCME, the type of signalling system to be used and the interfaces with the terrestrial network, including synchronization. Typical earth-station equipment configurations for IDR operation are described, and the design options that should be considered for the DCME, IDR modem, frequency converters, HPA and control and monitor systems are discussed.     

Intelsat planning and modelling software in support of IDR

In order to plan for and integrate intermediate data rate (IDR) carriers into the INTELSAT newtork, while achieving quality service with efficient use of resources, operational planning tools and transmission system models are necessary. These computer software tools and models, which have evolved and grown in parallel with the INTELSAT network, comprise numerous applications on various types of computers, including mainframe, mini and personal computer systems. This paper presents an overview of the major planning and modelling software models used at INTELSAT in support of the use of IDR digital carriers within the INTELSAT system.