稀土偶联剂WOT对PP复合材料老化性能的影响

通过高分子材料自然老化实验前后力学性能的变化,研究了稀土偶联剂WOT对PP／CaCO3、PP／Mg(OH)2、 PP／BaSO4复合体系的老化性能的影响。发现WOT对这三种填料均有良好的改性作用,体系的力学性能显著提高, 老化性能明显改善,填充量高时这种作用更加明显。老化180天后,WOT和CaCO3用量高的体系的冲击强度是纯 PP的2-2.4倍,性能保持率为66％-74％;WOT、和Mg(OH)2用量高的体系的冲击强度是PP的2.4-2.8倍,性能保 持率为77％-80％:WOT和BaSO4用量高的体系的冲击强度是PP的2.7-3.3倍,性能保持率为74％-91％。     

广东省高层建筑地基基础调查报告

本文调查了三十幢高层建筑的基础处理,包括钻孔灌注桩,锤击(振动)沉管灌注桩、预制钢筋混凝土桩、箱形基础及独立柱基等。重点总结了钻孔桩和锤击(振动)沉管灌注柱的设计、施工方法及其适用范围。报告最后提出了一些需要进一步研究的向题。     

中国城市规划协会信息管理工作委员会2006年年会在南京召开

11月13～14日，中国城市规划协会信息管理工作委员会2006年年会在东南大学的榴园宾馆召开。此次年会由中国城市规划协会信息管理工作委员会主办，江苏省城市规划协会新技术应用专业委员会、南京市城市规划协会、南京市城市规划编制研究中心、《规划师》杂志社承办。中国城市规划协会副会长任致远、南京市政府副市长陆冰、江苏省建设厅副厅长张泉出席了会议并致辞。中国城市规划协会信息管理工作委员会主任委员、《规划师》主编、广西建筑综合设计研究院院长雷翔出席了会议并主持了开幕式，     

塑料包装材料技术发展研讨会会议纪要

中国包协塑料包装委员会于３月２３日至３月２７日在无锡市召开了２００１年年会暨塑料包装材料技术发展研讨会。出席会议的有塑料包装材料生产企业。石化原料厂、包装机械厂的专家技术管理人员，共１３０多人。同时，还邀请国外原料、设备生产厂家主要有：奥地利兰精公司、德国莱宝公司、德国巴斯夫公司、意大利耐世隆公司、法国宝利得公司、意大利沙杰克公司，进行了技术交流。国内原料厂与塑料包装机械厂、广东金明塑料设备公司、大连东方塑胶设备开发公司、燕山石化二厂、高盟化工公司等也在大会上作了新型包装机械介绍。塑料包装材料生…     

Comparative in vitro Study on Pure Metals(Fe,Mn,Mg,Zn and W) as Biodegradable Metals

Five pure metals including Fe,Mn,Mg,Zn and W have been investigated on their corrosion behavior and in vitro biocompatibility by electrochemical measurement,static immersion test,contact angle measurement, cytotoxicity and hemocompatibility tests.It is found that the sequence of corrosion rate of five metals in Hank’s solution from high to low is:Mg > Fe > Zn > Mn > W.Fe,Mg and W show no cytotoxicity to L929 and ECV304 cells,Mn induces significant cytotoxicity to both L929 and ECV304 cells,and Zn has almost no inhibition effect on the metabolic activities of ECV304 while largely reduces the cell viability of L929 cells. The hemolysis percentage of five pure metals is lower than 5%except for Mg and platelets adhered on Zn has been activated and pseudopodia-like structures can be observed while platelets on the other four metals keep normal.     

Optimizing the Preparation Parameters of Nanocrystalline Zirconia for Catalytic Applications

Nanocrystalline zirconia powder with high surface area and high tetragonal phase percentage is prepared by the precipitation method using ammonium hydroxide as a precipitating agent.The pH of precipitation,preparation temperature and calcinations’ temperature are optimized.Crystallite size,specific surface area,tetragonal phase percentage and the thermal stability of the prepared samples are identified by diferent characterization tools such as X-ray difraction(XRD),thermo gravimetric analysis(TGA),diferential scanning calorimetry(DSC),BET surface area,scanning electron microscopy(SEM)and transmission electron microscopy(TEM).The optimum preparation parameters for obtaining nanocrystalline zirconia with high percentage of tetragonal phase and high surface area are pH 9,preparation temperature of 80℃ and calcinations’ temperature of400℃.The sample prepared under optimized conditions showed a high specific surface area of 179.2 m2/g,high tetragonal phase percentage of 81%and high catalytic activity(60%)for synthesis of butyl acetate ester.     

不同碳源TiC/Ti复合材料的显微组织及力学性能

采用原位熔铸法制备了不同TiC添加量以及不同碳源(碳粉末、碳纤维和碳纳米管)的TiC/Ti复合材料,研究了TiC添加量和碳源种类对铸态和锻态TiC/Ti复合材料显微组织的影响,并对不同碳源制备的铸态和锻态复合材料进行了断裂韧性和室温压缩性能测试。结果发现,TiC/Ti复合材料主要由α-Ti和TiC组成;α片层宽度随着TiC体积分数的增加逐渐下降,TiC呈条状或片状。经过锻造,TiC呈近等轴状,α片层进一步细化。以碳粉末作为原位反应碳源制备的铸态TiC/Ti复合材料,断裂韧性较高,以碳纤维和碳纳米管作为碳源时,断裂韧性较低;以不同碳源制备的铸态复合材料,室温抗压强度和屈服强度无明显差异。     

基于单片机的数控电流源设计

本文给出了一种基于单片机控制的数控电流源设计。本设计以PIC16F877A单片机为核心部件，采用PID算法实现了量程可选、输出可调、步进精确、纹波电流极小的功能，而且可将输出电流预置值、实测值存LED上同时显示。经实验测试证明，此设计具有较高的控制精度。     

700 GW: A New Start of Electric Power Industry

On December 4, 2007, unit 1of Taizhou Power Plant was put into operation, which became the symbolic unit of the installed capacity reaching 700 GW in China. On July 31, 2008, sponsored by the National Energy Administration and assisted by the China Electricity Council and the China Guodian Corporation, the “Conferring Ceremony for the 700 GW Symbolic Generating Unit of China“ was held in the Great Hall of the People, Beijing. Zhang Guobao, vice chairman of the National Development and Reform Commission and ...