近类凸集值映射下的择一性定理

在线性拓扑空间中，得到若干个近类凸、近次类凸集值映射下的择一性定理。     

Atomic Force Microscope Techniques for Adhesion Measurements

The Atomic Force Microscope (AFM) has become a powerful apparatus for performing real-time, quantitative force measurements between materials. Recently the AFM has been used to measure adhesive interactions between probes placed on the AFM cantilever and sample surfaces. This article reviews progress in this area of adhesion measurement, and describes a new technique (Jump Mode) for obtaining adhesion maps of surfaces. Jump mode has the advantage of producing fast, quantitative adhesion maps with minimal memory usage.     

广州亚运城主场馆建(构)筑物放线测量技术应用实践

介绍了亚运城建(构)筑物的放线测量新技术应用,通过PDA的GZCORS放线测量集成技术投入,完成数据采集、放样测量、成果整理与成果输出,构成独特的测量模式.     

25CrMo钢的热变形行为及加工图

利用Gleeble3500热模拟机对25Cr Mo钢进行热压缩试验,研究变形温度为950~1 100℃、应变速率为0.01~10 s-1条件下的应力-应变曲线。根据动态材料模型DMM建立材料的热加工图,确定其热变形的流变失稳区,得到25Cr Mo钢在试验参数范围内的最佳热变形工艺参数:温度为1 050~1 100℃、应变速率为0.1 s-1。     

新都桂湖水系演变及特点研究

鉴于历史地图自身信息的模糊性,采用历史地图解译法对桂湖水系相关的历史地图进行解译绘制,通过解译图纸能较为清楚展示桂湖水系的演变过程,进而相对客观地总结其水系的演变特点。从城市水系与园林水源、水系周边建筑营建、水系空间形态划分3个方面,按照隋唐、宋代、明清、近代、现代的时间段对桂湖水系的演变过程进行梳理,并从新都城市水系与桂湖园林水系的关系、水系周边建筑功能及附属空间属性的变化、水系形态的艺术划分3方面归纳总结水系演变特点: 1）新都城市水系与桂湖园林水系在形态结构联系上呈现出完整、完善、破坏、重建4个阶段,桂湖园林水系与新都城市水系在水系体系构成上经历融合、维持、撤离、融入4个阶段的变化。2）水系周边建筑功能经纪念性萌芽、公共性增强、纪念性强化、纪念性精炼的变化,其建筑附属空间布局经历游赏性空间错列分布、公共性空间沿岸排布、纪念性空间中心贯穿、纪念性空间核心主导的4个阶段,使得桂湖从以游玩聚会为主的驿站园林变为以纪念为主的公共园林。3）桂湖水系的形态结构划分呈一池三岛“粗”分、五岛两堤“概”分、五岛两堤“密”分与五岛两堤“旷”分的演变特点。     

Flow Regime Maps for Flow of Liquid Through Downcomer in a Turbulent Bed Contactor

The provision of a downcomer to classical turbulent bed Contactor (TBC) increases the gas treating capacity of the equipment. When the downcomer is provided, it is expected that all the liquid passes through the downcomer only without any liquid flow through the distributor. In the present study, the operational regime for the flow of liquid only through the downcomer is experimentally evaluated for various geometric parameters and particle characteristics. It is observed that the preferred operational regime without dumping and weeping increases with an increase in Archimedes number and downcomer diameter, and decreases with an increase in static bed height and downcomer weir height. Correlations are proposed to satisfactorily predict experimentally observed operational regime.     

Hydrodynamics and liquid phase axial mixing in orifice pipe reactor

Two phase flow in a horizontal pipe, with orifice plates placed at regular intervals as obstructions, was studied for the effect of phase velocities on flow patterns, fractional phase hold-ups, pressure drop and liquid phase axial dispersion. Radioactive technetium-99m (as an aqueous solution of sodium pertechnatate) was used as tracer. A pulse injection technique with two point measurements was employed. Three different orifice diameters were used (8 mm, 16 mm, and 20 mm) in a pipe diameter of 32 mm. The orifice spacing was 500 mm in all cases. Superficial gas (air) velocity was varied over a range from 0.02 m/s to 1.0 m/s and superficial liquid (water) velocity from 0.03 m/s to 0.85 m/s. Different flow patterns under different flow conditions were identified and a generalised flow map is presented. Variations in hold-ups and pressure drop with flow patterns have been explained. Rational correlations have been developed for fractional phase hold-ups and pressure drop. A preliminary comparison of two phase gas-liquid flow in a horizontal pipe with orifice obstructions (to be called orifice pipe reactor), as a gas-liquid contacting device, is made with a conventional bubble column reactor. Recommendations have been made for future work.     

基于本体的文档互操作度量模型

为客观、自动化地评价各种文档在不同情况下实际达到的互操作能力,提出利用本体技术建立文档互操作性度量模型。在准确、形式化地描述文档概念及其关联的基础上,综合考虑各种影响互操作性的度量因素,通过度量函数对不同文档系统间的互操作性进行计算,通过量化的结果为互操作性测评提供客观依据。基于本体的形式化描述,实现了一个面向办公文档领域的原型系统以自动化地进行文档互操作性度量,验证了度量模型构建方法的有效性和模型的实用性。     

节能型甲基异丙基酮分离工艺研究

甲基异丙基酮生产中,水与甲基异丙基酮等形成共沸物,文中运用剩余曲线图(RCM)方法对甲基异丙基酮分离过程进行分析研究,根据非均相共沸精馏原理,提出了在丙酮塔中增加油水分离器的方法脱除待分离物系中的水,从而达到节能的目的。文章在Aspen Plus中建立了该节能型甲基异丙基酮分离过程的模拟模型,进行了计算和分析,并加以实验验证,二者比较吻合。结果表明,该分离工艺即节省了设备投资,又降低了分离能耗,并且提高了脱水效率,改善了产品质量,同时还提高了产品收率,所用方法对简化工艺流程起到了积极作用。     

基于改进克隆选择算法的蛋白质关联图预测

针对蛋白质关联图预测问题,提出一种克隆选择算法与蛋白质折叠规律相结合的预测方法,综合使用蛋白质序列疏水性质、残基的二级结构倾向、关联图总点数等信息,构造了基于限制规则的克隆选择算法适应度函数,设计了符合关联图生物学特性的变异操作。算法不需要使用额外蛋白质作为训练集,不需要从现有蛋白质数据库中提取模板,因此不受现有蛋白质结构数据的局限,可以由序列信息直接进行预测。对200个非同源蛋白质的测试验证了算法的有效性。