ZrO2陶瓷与304钢配副高水基液压元件摩擦学性能

采用Rtec摩擦磨损试验机MFT-5000、白光三维干涉仪和扫描电镜,考察不同载荷和高水基乳化液浓度条件下ZrO₂陶瓷与304钢配副的摩擦系数、磨损体积和表面形貌,并探讨其磨损机制。通过控制变量法分析表明:载荷比高水基乳化液浓度对摩擦系数的影响较大,且随着载荷的增大,摩擦系数趋于稳定,而磨损体积增大;随着浓度的增大,摩擦系数逐渐减小并趋于稳定,磨损体积先减小后增大,在100 N/Hz和浓度为6%工况下,陶瓷与钢配副的摩擦系数和磨损体积最小;陶瓷与钢配副在高水基乳化液中以氧化磨损为主,且随着浓度增大,氧化磨损先增大后减小,伴有犁削磨损。陶瓷与钢配副模拟液压元件内部摩擦副的润滑效果,通过分析试验结果找到合适的工况来提高液压元件的寿命和工作效率。     

华侨大学厦门校区图书馆中庭夏季室内热环境实测与分析

本文采用自动记录仪,对华侨大学厦门校区图书馆中庭夏季室内热环境实测。根据测得的室内热环境4个参数,结合PMV分析评价华侨大学厦门校区图书馆中庭夏季室内热环境舒适度。主要结论有:(1)华侨大学厦门校区图书馆在开窗和闭窗状态时,中庭温度随着高度的增加而升高;(2)华侨大学厦门校区图书馆在开窗和闭窗时中庭温度差不多,但是开窗时候湿度变化的曲线幅度范围比闭窗的时候大。(3)华侨大学厦门校区图书馆中庭PMV值随着高度的增加而升高,热舒适性随着高度的增加而下降;(4)华侨大学厦门校区图书馆在夏季时不论在开窗还是闭窗状态下,中庭的室内热环境都处于不舒适的范围内。     

原油中酸性组分对油/水乳状液的影响研究

原油中的酸性组分是天然表面活性物质,影响油/水乳状液的稳定性,相关研究对采出液破乳有重要参考价值。作者研究了原油中酸性组分对油/水乳状液破乳效果、乳状液粘度、油/水接触角、界面膜强度的影响,结果如下:随w(酸性组分)从2.25%增加到2.65%,85℃时,脱水率由81.2%降低至14%,粘度由212.3mPa·s增加到1 452mPa·s,乳状液的稳定性大幅度增加;随w(酸性组分)增加,油/水接触角减小,界面膜强度增加;虽然间隔都是0.2%,w(酸性组分)为2.25%和2.45%时,油/水接触角、单滴破裂率相差较大,但w(酸性组分)为2.45%和2.65%时相差较小。     

Design of a General‐Purpose European Compound Screening Library for EU‐OPENSCREEN

This work describes a collaborative effort to define and apply a protocol for the rational selection of a general‐purpose screening library, to be used by the screening platforms affiliated with the EU‐OPENSCREEN initiative. It is designed as a standard source of compounds for primary screening against novel biological targets, at the request of research partners. Given the general nature of the potential applications of this compound collection, the focus of the selection strategy lies on ensuring chemical stability, absence of reactive compounds, screening‐compliant physicochemical properties, loose compliance to drug‐likeness criteria (as drug design is a major, but not exclusive application), and maximal diversity/coverage of chemical space, aimed at providing hits for a wide spectrum of drugable targets. Finally, practical availability/cost issues cannot be avoided. The main goal of this publication is to inform potential future users of this library about its conception, sources, and characteristics. The outline of the selection procedure, notably of the filtering rules designed by a large committee of European medicinal chemists and chemoinformaticians, may be of general methodological interest for the screening/medicinal chemistry community. The selection task of 200K molecules out of a pre‐filtered set of 1.4M candidates was shared by five independent European research groups, each picking a subset of 40K compounds according to their own in‐house methodology and expertise. An in‐depth analysis of chemical space coverage of the library serves not only to characterize the collection, but also to compare the various chemoinformatics‐driven selection procedures of maximal diversity sets. Compound selections contributed by various participating groups were mapped onto general‐purpose self‐organizing maps (SOMs) built on the basis of marketed drugs and bioactive reference molecules. In this way, the occupancy of chemical space by the EU‐OPENSCREEN library could be directly compared with distributions of known bioactives of various classes. This mapping highlights the relevance of the selection and shows how the consensus reached by merging the five different 40K selections contributes to achieve this relevance. The approach also allows one to readily identify subsets of target‐ or target‐class‐oriented compounds from the EU‐OPENSCREEN library to suit the needs of the diverse range of potential users. The final EU‐OPENSCREEN library, assembled by merging five independent selections of 40K compounds from various expert groups, represents an excellent example of a Europe‐wide collaborative effort toward the common objective of building best‐in‐class European open screening platforms.     

某工程机械液压元件装配车间工艺设计

针对国内某工程机械液压元件装配车间的工程设计任务,通过合理选用诸如:液压元件清洗机、液压元件专用装配线等先进工艺设备,显著缩短生产流程,提升生产率,实现了液压元件装配过程的自动化,对提高液压元件行业的装配工艺水平起到一定推动作用。     

核电站大型构件厂内制作技术

核电结构筒体质量大、尺寸大、重心高,易于变形,使得在现场拼装和翻转过程中,凸显出大量的施工技术挑战和难点.为此,在组对过程中,采用尺寸控制点;在焊接和翻转过程中,均采用防变形工装;在质量控制上,通过制定详细的质量过程控制计划并加以具体落实,为我国核电大型结构件的拼装施工提供技术参考.     

超高层钢结构转换层施工技术

广州珠江新城J2-2地块项目超高层钢结构转换层施工技术,采取厂内实体卧拼和计算机模拟预拼互验规则;优化后,可直接采用计算机模拟验收。桁架层超重构件吊装、定位、焊接等关键施工工段,采取相应的施工措施,保证施工质量及精度。为超高层钢结构转换层施工积累了宝贵的经验。     

以扬州市为例谈城市空间特色规划

基于城市设计的视角,以扬州市为例,深入分析了扬州市的空间特色资源要素,将扬州的城市特色凝练为"古、文、水、绿、秀"五大方面,构建了"一区、一轴、一带"的城市特色空间结构框架,并对重点空间特色区域提出了具体的控制与引导要求,以保护城市传统风貌、发扬地域文化、彰显城市空间特色。     

界限消融的当代公共图书馆建筑设计

公共图书馆不仅作为公共活动的重要空间,也是城市资本的重要组成部分。作为最早出现的公共建筑形式之一的公共图书馆,其理论研究却相对滞后。随着信息技术的发展,人们对文化的需求逐渐增强,城市功能的不断叠加,当代公共图书馆被赋予了更多的意义。本文正是在这一时代背景下,通过对于影响公共图书馆发展的要素进行分析,分析、预判当代公共图书馆的发展方向,以期对设计有所启示。     

基于ERP电子元器件数据库的标准化梳理方案的探讨

该文针对ERP中电子元器件数据库中部分物料命名模糊,尤其是物料信息库缺乏管控造成物料的一物多码的现状,提出了采用分类的方法对物料数据进行管理,结合物料主数据的基本构成及物料数据库存在的问题,给出了具体的解决方法。从而实现电子元器件数据库标准化管控,达到企业降本增效的目的。