走近中国的数字消费者

很多海外人士以为，中国人除了使用移动电话外，很少使用数字产品，而那些移动电话使用者大多居住在中国东部沿海大城市。这个观念在两三年前可能是正确的，但如今中国人已广泛使用数字产品，即便是在欠发达的中西部地区。许多中国人使用宽带互联网服务、计算机、移动电视，并沉迷于即时消息和web2．0网络活动，比如上传歌曲和图片、撰写博客、参与其他虚拟社区活动等。即使在中国西部小城市，这些趋势也很明显。     

色谱新前沿

利用小粒径填料填充液相色谱柱,柱性能达到了van Deemter曲线上非常令人满意的区域:柱效极高且受流速影响小。基于该原理,本文介绍了快速、高效和高峰容量的色谱。     

仿真建模在机场容量分析中的应用

本文利用Promodel建立了机场在不同条件下的仿真模型,以实现对机场容量评估和容量瓶颈的分析。研究结果表明,随着航班总量的增加,空侧的跑道将成为容量限制瓶颈,研究还发现航班结构对跑道等待时间有着重要的影响,从而为机场管理当局制定正确决策提供了依据。     

游弋Fiber Channel

经销商们利用它来从事SCSI难以进行的工作,而它却廉价地抛售原本昂贵的储存区网络解方案。     

达成交易之法

你已通读谈判指南书至T条目并遵其行事,你已发现双方的核心利益所在,你通过脑力激荡寻找有创意的解决方案,甚至已经与对方公司代表建立起良好的关系。你的行为均正确合理,却仍未能签订合同。如何将对方的犹豫转变为肯定?多作让步绝非正解。若此时对方面临双重选择:要么接受你提出的交易条件。要么进一步谈判,则切不可修改提案,做出让步,因为每次让步都于无意中鼓励对方拖延时间,谋取更多利益。某些情况下,你必须在交易降至底线前,迫使对方作出抉择:要么接受目前的交易,要么一无所有。你的目标不应当是下达“接受或拒绝”的最后通牒,而是精…     

Methodologic challenges of e-health research

In this article, research-based strategies used in a web-based study to assess the impact of participation in cancer-related mailing lists on cancer survivors and caregivers are highlighted. The paper presents alternative methods of measuring response rates in Internet surveys. Response rate estimation, based on American Association for Public Opinion Research guidelines, ranged between 15% and 24.9% for the study. Several strategies were implemented to increase survey participation and reduce item nonresponse. Few participants opted for a telephone survey as an alternative to a web-administered design (mixed-mode administration). Using time-stamp data to diagnose places in the questionnaire where respondents prematurely exited or broke off survey participation, we were able to decrease premature break offs. A lottery was also implemented to increase response rates. The experience of obtaining institutional review board approval for the lottery is also described. Preliminary data indicate slight increases in response rates subsequent to implementing the lottery.     

Measuring the influence of built neighborhood environments on walking in older adults

There is a need for greater understanding of how perceptions and objective measures of the physical environment influence physical activity among seniors. The goal of this study was to examine the degree of association between perceived and objective characteristics of the neighborhood environment and the relation of each type of measurement to neighborhood walking in older adults. Data on self-reported frequency of walking in the neighborhood and perceived measures of neighborhood environment from 105 older adults were linked to objective measures assessed by geographic information systems and an audit instrument. Perceived and objective measurements of the built environment exhibited a low degree of agreement (kappas: <.20). After adjustment for education, age, and gender, presence of a mall was positively associated with neighborhood walking in both the objective and perceived models.