新型固体润滑剂的研制及其在汽油机油中的应用

在分析国内高级轿车润滑油生产现状的基础上，介绍了作者近年来进行高级轿车润滑油的研制情况，以及利用自制的固体润滑剂调配的一种汽油机油，本文以用户使用情况为依据，分析了该种润滑油的特点。     

现代润滑剂性能要求与发展前景

润滑剂在机械设备中,起到良好的润滑和清洁作用,通过对现阶段常用矿物润滑油性能要求的介绍,认为矿物润滑油资源不可再生,对环境有污染,提出未来润滑剂的发展前景应具有良好极压抗磨性能和环境友好性能。     

硅油与润滑

出现于第二次世界大战末期的硅油润滑剂,经历了长期实践的考验,四十年来无论在品种、产量以及用途等方面,都取得了巨大的发展,成为一类重要的润滑材料。与此同时,硅油也是一种润滑油添加剂,用于改善石油烃类润滑油的性能。硅油类在作为润滑剂及润滑油添加剂时所表现的许多和石油烃类不同的性能,是和它本身所具有的     

航空润滑剂拖动特性试验及弹流拖动系数的回归计算

润滑剂的弹流拖动特性对滚动轴承的动态性能有着很大的影响。采用自行设计的高速润滑剂弹流拖动力试验台对国产某航空润滑油进行了拖动力测试以及试验数据的处理，采用了新的回归计算公式和算法，计算速度快，精度高，并得出了可供轴承参数设计的经验公式。     

抽油机脂型润滑剂研究

介绍了目前大庆油田抽油机润滑方面存在的问题,叙述了脂型润滑剂的研制过程,实际使用试验证明,该润滑剂兼有润滑油和润滑脂的双重性质,可以作为抽油机的专用润滑剂.     

食品生产企业应使用食品级润滑油

食品安全已经连续几年成为社会的热点问题．而三聚氰胺事件更是让无数儿童忍受折磨。并且整个中国乳制品制造行业也遭受了前所未有的打击。如今．食品安全问题已经涉及到了包括原料渠道、添加物质、储运销售等方方面面的细微环节。现在发达国家一般都要求食品企业全部采用食品级润滑剂。那么．对于食品加工企业而言，会不会因为没有正确使用润滑剂而使产品存在安全隐患呢？同时，有多少的损失是由于润滑剂使用不当或者是因为与维护有关的问题造成的？使用普通的润滑油作为食品加工机械的润滑剂．会对最终产品及生产加工过程带来什么样的不良影响？为什么食品级润滑油能够保证食品的质量安全？     

高液压下压缩加工的摩擦和润滑

一、绪言在塑性加工中使用液体作润滑剂时的润滑机理,受到被加工材料的材质、初始表面状态、变形特征、润滑油性质、供油方式和加工条件等因素的影响。液体润滑是通过被封闭在工具和被加工材料之间的润滑油来实现的。加工初期,被封闭润滑油的量因加工材料的力学性质以及初始表面状态、润滑油的特性(尤其是精度)及其供油方式和加工速度的不同而异。加工初期处于工具和材料之间的润滑油在加工到一定程度之前随加工程度而向外流出。由各种条     

轧制润滑过程与润滑剂表面化学(Ⅰ)──润滑剂油膜强度与添加剂性能

实验测定了润滑油油膜强度与各种极性添加剂浓度的关系，分析了极性分子的极性基和非极性基结构对润滑油油膜强度的影响，指出了边界吸附膜的形成及强度对润滑剂油膜强度的决定作用，并讨论了添加剂的复合作用机理及其应用条件．     

非牛顿特性下冷挤压流体动力润滑模型的建立

应用磨擦学和金属塑性成形理论，对冷挤压工艺中的流体动力润滑机理进行了分析。针对冷挤压高压、大剪应变率工况下，润滑剂呈非牛顿特性的特点，运用Ostwald非牛顿体模型，分别建立了冷挤压非稳定流体动力润滑状态和稳定流体动力润滑状态的数学模型，并运用该模型对以蓖麻油作润滑剂的纯铝冷挤压进行了分析。计算结果揭示了冷挤压过程中，润滑油膜厚度及油膜压力的分布。     

发动机用环境友好润滑剂低温性能

论述了环境友好润滑剂的研究意义及植物油作为润滑油基础油的可生物降解性 ,重点分析了润滑油的低温成胶理论及动力学 ,揭示了凝胶化过程的动力学规律 ,并根据流体活化能理论分析了影响润滑油低温性能的因素 ,从而为研究改善润滑油低温性能提供了理论依据。     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

Exciton Seebeck in Molecular Systems

Various applications relevant to the exciton dynamics,such as the organic solar cell,the large-area organic light-emitting diodes and the thermoelectricity,are operating under temperature gradient.The potential abnormal behavior of the exicton dynamics driven by the temperature difference may affect the efficiency and performance of the corresponding devices.In the above situations,the exciton dynamics under temperature difference is mixed with     

Achieving Unusual States of Matter Under High Pressure

The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

正~~     

An on-line scaling method for improving scalability of a database cluster

The explosive growth of the Internet and database applications has driven database to be more scalable and available, and able to support on-line scaling without interrupting service. To support more client's queries without downtime and degrading the response time, more nodes have to be scaled up while the database is running. This paper presents the overview of scalable and available database that satisfies the above characteristics. And we propose a novel on-line scaling method. Our method improves the existing on-line scaling method for fast response time and higher throughputs. Our proposed method reduces unnecessary network use, i.e. , we decrease the number of data copy by reusing the backup data. Also, our on-line scaling operation can be processed parallel by selecting adequate nodes as new node. Our performance study shows that our method results in significant reduction in data copy time.     

An improved R-tree based on childnode''s probability

R-Tree is a good structure for spatial searching. But in this indexing structure,either the sequence of nodes in the same level or sequence of traveling these nodes when queries are made is random. Since the possibility that the object appears in different MBR which have the same parents node is different, if we make the subnode who has the most possibility be traveled first, the time cost will be decreased in most of the cases. In some case, the possibility of a point belong to a rectangle will shows direct proportion with the size of the rectangle. But this conclusion is based on an assumption that the objects are symmetrically distributing in the area and this assumption is not always coming into existence. Now we found a more direct parameter to scale the possibility and made a little change on the structure of R-tree, to increase the possibility of founding the satisfying answer in the front sub trees. We names this structure probability based arranged R-tree (PBAR-tree).     

Integrating GIS Web services based on mediating architecture

The geographic information service is enabled by the advancements in general Web service technology and the focused efforts of the OGC in defining XML-based Web GIS service. Based on these models, this paper addresses the issue of services chaining,the process of combining or pipelining results from several interoperable GIS Web Services to create a customized solution. This paper presents a mediated chaining architecture in which a specific service takes responsibility for performing the process that describes a service chain. We designed the Spatial Information Process Language (SIPL) for dynamic modeling and describing the service chain, also a prototype of the Spatial Information Process Execution Engine (SIPEE) is implemented for executing processes written in SIPL. Discussion of measures to improve the functionality and performance of such system will be included.     

Tracking data management using topology of moving object database system for moving object constrained trajectory in LBS application

Advances in wireless technologies and positioning technologies and spread of wireless devices, an interest in LBS (Location Based Service) is arising. To provide location based service, tracking data should have been stored in moving object database management system (called MODBMS) with proper policies and managed efficiently. So the methods which acquire the location information at regular time intervals then, store and manage have been studied. In this paper, we suggest tracking data management techniques using topology that is corresponding to the moving path of moving object. In our techniques, we update the MODBMS when moving object arrived at a street intersection or a curved road which is represented as the node in topology and predict the location at past and future with attribute of topology and linear function. In this technique, location data that are corresponding to the node in topology are stored, thus reduce the number of update and amount of data. Also in case predicting the location,because topology are used as well as existing location information, accuracy for prediction is increased than applying linear function or spline function.