新型垂直筛板单罩液体提升量的测定与关联

在有机玻璃冷模塔内，用空气－水物系测定了单罩液体提升量。根据实验结果，分析清液层高度、板孔气速与板孔大小对提升量的影响，并得出了相应的关联式，可供设计参考。     

汽车牌照定位技术研究

在车牌自动识别系统中,车牌定位的准确度是决定系统性能的关键因素之一。该文提出了一种将彩色图像边缘检测技术与BP神经网络相结合的车牌定位方法。通过选取合适的预处理算法和抽取适当的特征使算法具有很好的准确性、适应性和实时性。     

基于Profibus的车间设备分布式监控系统研究

介绍了应用于宁波艾维洁具有限公司的基于Profibus现场总线技术的车间设备分布式监控系统,并系统地给出了硬件组成原理、监控系统的功能及系统组态的实现,该系统可同时对多台设备进行现场及远程监控.     

面向社区服务的旅游地理信息系统

近年来,随着旅游业和互联网技术的迅速发展,网络旅游业正蓬勃崛起,结合上海社区服务网（SCS）的实际情况,该文提出了建设面向社区服务的旅游地理信息系统（TGIS）方案,面向社区服务的旅游信息系统是一个服务于社区的旅游业宣传、咨询、预订、决策支持和管理的综合性网络应用系统。它通过在Internet上建立一个相对独立的行业信息服务网络,来提供一套服务于社区的网上系统。     

Improved approach using symmetric microstrip sensor for accurate measurement of complex permittivity

A novel symmetrical planar sensor based on splitter/combiner microstrip sections with a pair of interdigital capacitors (IDCs) and 2 complementary split ring resonators (CSRRs) structure is presented. A high sensitivity area to the dielectric property of surrounding materials has been established by locating IDC unit on the top‐plane while a rectangular CSRR structure etched out on the ground plane. The symmetrical circuit makes the sensitivity further improved to the introduction of sample to be tested because of the destruction of the symmetry. The complex permittivity of the dielectric samples has been evaluated from the actual experimental scattering parameters by using back propagation neural network techniques. The proposed methodology is validated by fabricating the sensor on Rogers5880 substrate and testing various standard dielectric samples viz. PVC, Glass epoxy, FR4, and Glass in C‐band. The measured complex permittivity of the test specimens is found to be in close agreement with their values available in literature with maximum error of <5%.     

HTML5在移动互联网开发中的应用

随着4G技术的普及,基于台式机的传统互联网模式已不能满足日益便利化的网络需求,移动互联网地位日益突显。运用HTML5技术进行移动互联网开发不但高效而且通用,其方便的APP应用和安装方式使其在移动开发平台上的地位日益突出。     

电沉积(Fe-Ni)-Al_2O_3复合镀层及其摩擦磨损性能的研究

对(Fe-Ni)-Al_2O_3复合镀层的制备工艺及其摩擦磨损性能进行了试验研究。结果表明,根据传统的电镀工艺,悬浮在酸性氯化物电解液中的Al_2O_3,微粒能与Fe、Ni共沉积形成(Fe-Ni)-Al_2O_3复合镀层,通过正交试验,确定了制备复合镀层的最佳工艺参数。与Fe-Ni合金镀层和45~#淬火钢相比,(Fe-Ni)-Al_2O_3复合镀层具有良好的耐磨性和减摩性。     

磷酸镁水泥快速修补材料的性能试验

为了客观评价磷酸镁水泥材料的快速修补性能,以普通硅酸盐水泥砂浆为基准,在两种砂浆28 d抗压强度相当的条件下进行了磷酸镁水泥砂浆快速修补应用性能的对比试验。结果表明,相对于普通硅酸盐水泥砂浆,磷酸镁水泥砂浆作为快速修补材料具有更为优异的性能:新拌砂浆具有高流动度及快速凝结硬化的特点,凝结时间不到20 min;硬化砂浆早期力学性能好,3 h抗压强度和黏结强度分别为42.5 MPa和1.45 MPa;弹性模量低,28 d静力抗压弹性模量和抗拉弹性模量分别降低了13.5%和8.9%;拉伸应变高,28 d极限拉伸值提高了38.8%;耐久性优异,56 d干缩应变仅为118μm/m,降低了86.4%,28 d抗冲磨强度则提高了45.8%。     

Changes in cholesteryl ester transfer protein concentration during normal gestation

Background: It has been shown that endogenous estrogen may affect the concentration of cholesteryl ester transfer protein (CETP) and that the gestation in women is accompanied by increased levels of endogenous estrogen. Objectives: To examine the changes in CETP concentration and to investigate the relationship between CETP and estrogen levels during normal pregnancy. Methods: Serum concentrations of CETP, estrogen and lipid traits were determined from 296 healthy women at different times during gestation. Results: Pregnant women exhibited a significant elevation in the concentration of CETP as compared with non‐pregnant women (3.11 ± 1.51 mg/L vs. 2.64 ± 1.25 mg/L, p <0.001). The CETP concentration was highest in the first trimester (3.85 ± 1.33 mg/L, compared with controls, p <0.0001), declined progressively from the first to the third trimester and still remained elevated in the third trimester as compared with non‐pregnant subjects (p <0.05). A negative correlation was noted between serum CETP and estradiol (E₂) levels in pregnant women (r = –0.288, p <0.0001). In addition, significantly negative correlations between the serum CETP concentration and all the lipid traits examined were found in gestating women. Conclusion: CETP concentrations were significantly elevated in pregnancy and decreased progressively from early to late gestation. The results suggest that endogenous E₂ is either not involved or its effect on CETP is dominated by elevated lipid levels or some other factors during mid and late pregnancy.     

St-BA-BVP无皂共聚物阳离子乳胶粒大小及形态研究

合成阳离子共单体 1-丁基 ,4 -乙烯吡啶溴化铵 ( BVP) ,并以偶氮二异丁基咪盐酸 ( A IBA)作引发剂 ,制备苯乙烯 /丙烯酸丁酯 ( St/ BA )共聚物乳液 ,通过 TEM研究改变 BVP的浓度、St/ BA主单体的配比及单体加料方式对 P( St/ BA / BV P)乳胶粒大小形态的影响 ,结果表明批量法和单体全滴加法制备的乳胶粒形状规则、分布均匀、半连续法制备的乳胶粒子呈多分散分布 ,粒径相差很大 ,且 P( St) / P( BA)得到的乳胶粒呈明显的核壳结构。