A computerized household activity scheduling survey

Household activity scheduling is widely regarded as the underlying mechanism through which people respond to emerging travel demand management policies. Despite this, very little fundamental research has been conducted into the underlying scheduling process to improve our understanding and ability forecast travel. The experimental survey approach presented in this paper attempts to fill this gap. At the core of the survey is a Computerized Household Activity Scheduling (CHASE) software program. The program is unique in that it runs for a week long period during which time all adult household members login daily to record their scheduling decisions as they occur over time. An up-front interview is used to define a household's activity agenda and mode availability. A sample of 41 households (66 adults and 14 children) was used to assess the performance of the survey. Analysis focuses on times to completion, daily scheduling steps, activity-travel patterns, and scheduling time horizons. Overall, the results show that the computer-based survey design was successful in gathering an array of information on the underlying process, while minimizing the burden on respondents. The survey was also capable of tracing traditionally observed activity-travel outcomes over a multi-day period with minimal fatigue effects. The paper concludes with a detailed discussion on future survey design, including issues of instrument bias, use of the Internet, and improved tracing of spatial behaviour. Future use of the survey methodology to enhance activity-travel diary surveys and stated responses experiments is also discussed. This revised version was published online in June 2006 with corrections to the Cover Date.     

久效磷致死性效应的毒理学研究

本文采用放射性核素示综枝术研究了久效磷在小鼠体内含量分布与致死性效应的关系,相应观察了不同致死剂量久效磷对小鼠血和脑胆碱脂酶活性抑制程度的差异。实验表明:久效磷急性中毒致死与脑内毒物的含量有较密切的关系。同时发现LD_(50)剂量中毒存活的小鼠,血和脑内胆碱脂酶活性受抑制程度与同剂量及超致死剂量中毒死亡小鼠之间无显著性差异。本文对久效磷致死的毒理机制造行了初步探讨。     

摩托车尾气净化催化剂的研制

以耐高温高比表面材料为载体制备的Pd和Pt Rh型摩托车尾气净化催化剂,经催化剂的温度特性、空燃比特性、空速特性以及耐老化性能试验表明,制备的2类催化剂均具有良好的催化活性及稳定性,而Pt Rh型催化剂的性能更为优异。     

人类活动与武汉市洪涝灾害

随着人口的增长和城市的发展 ,人类生产、生活活动无时无刻不在改变着它赖以生存的自然环境 ;人类在改变大自然的同时也受到了大自然的相应报复 ,如频率和强度愈来愈加大的洪涝灾害给人类带来了巨大损失。本文试分析人类生产、生活活动与洪涝灾害的关系 ,以武汉市这个特殊的地理客体作为研究对象 ,从人类自身寻找洪涝灾害发生的根本原因 ,旨在唤醒人类的生态环境意识 ,协调处理好人与自然的关系。     

C25水下混凝土配合比设计及技术措施

介绍了津汕高速公路漳卫新河特大桥水下C25号混凝土配合比设计思想及采取的技术措施.通过采用优质缓凝高效减水剂、Ⅰ级粉煤灰、限制原材料及混凝土中总碱含量、并缩小水胶比等综合措施和技术路线,有效地降低了混凝土用水量,改善了混凝土工作性,提高了混凝土的体积稳定性,实现了高性能水下混凝土的目标.     

共聚物PVA—MA—PEGA的表面活性研究

对具有一定表面活性的聚乙烯醇（ＰＶＡ）与丙烯酸甲酯（ＭＡ）和丙烯酸聚乙二烯醇（ＰＥＧＡ）共聚产物的临界胶束浓度（ＣＭＣ）,表面张力和界面张力进行了研究,并对共聚物与ＯＰ系列低分子表面活性剂的相互作用进行了探讨。实验结果表明：ＰＶＡ－ＭＡ－ＰＥＧＡ表面活性剂随着亲油单体含量的增加,共聚物分子的疏水性增加,ＣＭＣ值下降;高分子表面活性剂与ＯＰ１０复配后其最小表面张力,界面张力分别为３０．６ｍＮ／ｍ,０     

CD_3AK细胞对白血病细胞的体外杀伤作用

ＣＤ３单克隆抗体（ＣＤ３ＭｃＡｂ）对Ｔ细胞具有强烈的丝裂原作用。本文显示将ＣＤ３ＭｃＡｂ联合ＩＬ－２激活的杀伤细胞（ＣＤ３ＡＫ）对人急性白血病新鲜细胞和Ｋ５６２细胞均有明显杀伤作用。正常人ＣＤ３ＡＫ细胞对各型急性白血病杀伤活性无差别;正常人与白血病缓解期的ＣＤ３ＡＫ细胞杀伤力类同,且自体与异体亦无区别;但是,复发期ＣＤ３ＡＫ细胞杀瘤作用明显减弱。     

ANTIPROLIFERATIVE ACTIVITY OF HUMAN IFN-γ-EGF_3 FUSION PROTEIN ARE RELATED TO ITS EGF RECEPTOR COMPETITION

Ｉｎｔｅｒｆｅｒｏｎｇａｍｍａ（ＩＦＮ－γ）,ａｋｉｎｄｏｆｐｌｅｉｏｔｒｏｐｉｃｃｙｔｏｋｉｎｅ,ｉｓｐｒｏｄｕｃｅｄｂｙＴｌｙｍｐｈｏｃｙｔｅｓ．Ｂａｓｅｄｏｎｍａｊｏｒａｎｔｉｇｅｎｉｃｄｉｆ－ｆｅｒｅｎｃｅ,ｉｔｉｓｍｏｒｅｐｏｔｅｎｔｉｎｉ...     

水泥土搅拌桩处理富集火山灰淤泥的适用性分析

水泥土搅拌桩已广泛应用于饱和软黏土的地基加固,但在处理富集火山灰淤泥方面鲜有研究和应用,而水泥、火山灰、淤泥混合体系的反应机理是水泥土搅拌桩能否适用于加固富集火山灰淤泥的决定因素。通过分析水泥-土体系和水泥-火山灰体系的反应机理,得出火山灰效应强度是水泥-土-火山灰体系后期强度增长的关键。针对富集火山灰淤泥结构特性,采用适宜的水泥土配比参数和合适的施工工艺进行现场试桩,结果表明,28 d龄期平均无侧限抗压强度远超设计要求,且在同龄期同水泥掺入比等条件下桩体强度远大于常规饱和软黏土中的水泥土桩体强度,水泥土搅拌桩在富集火山灰淤泥的地基加固方面是适用的。     

Social networks,social influence and activity-travel behaviour: a review of models and empirical evidence

ABSTRACT

The study of social networks in activity-travel research has recently gained momentum because social activities and social influence were relatively poorly explained in activity-based models of travel demand. Over the last decade, many scholars have shown interest in identifying personal social networks that constitute an important source of explanation of activity-travel behaviour. This paper seeks to review two research streams: social networks and activity-travel behaviour, and social influence and travel decisions. We classify models, summarise empirical findings and discuss important issues that require further research.