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天津10m深粉质粘土释水模型试验研究
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作者 刘文浩 张淑朝 《天津科技》 2016年第2期39-42,共4页
土的给水度是基坑工程降水设计的基本参数,其精度直接影响着基坑降水量、降水井的数量和降水时间等的计算。取天津市埋深10,m的粉质粘土为代表性土样,经室内两次模型槽释水试验,揭示了含水层释水过程和给水度变化过程的内在机理,得出过... 土的给水度是基坑工程降水设计的基本参数,其精度直接影响着基坑降水量、降水井的数量和降水时间等的计算。取天津市埋深10,m的粉质粘土为代表性土样,经室内两次模型槽释水试验,揭示了含水层释水过程和给水度变化过程的内在机理,得出过程给水度与释水时间存在着双曲线的变化规律,进而推出过程给水度与释水时间的关系式,可为今后天津市的基坑降水设计及施工提供一定的参考。 展开更多
关键词 给水度 基坑降水 释水时间 粉质粘土
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Cyber Spatiotemporal as Media Culture: A Cognitive Level Study of Time (Tempo) and Space (Spatial) Based on Media Types
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作者 Sang-Hee Kweon Kyung-Ho Hwang Do-Hyun Jo 《Journalism and Mass Communication》 2012年第9期946-964,共19页
This research explores media users' cognition of "time" and "space" across different media platforms, and conducts a comparison among media genres including mass media and intemet media based on user's interacti... This research explores media users' cognition of "time" and "space" across different media platforms, and conducts a comparison among media genres including mass media and intemet media based on user's interactivities. Especially, this research focused on the internet's space and time perception based on communication genres such as e-mail, Blogs, portals, news-media, e-commerce, and social media (SNS). The research adopted two theories (construal level theory of time and space). The time related theory is "temporal distance theory". The space related theory is "media space". The research is designed to measure user's perception of interactivity, time-construal level and its media space cognition while using the media. There are two independent variables: Interactivities (contents, user, and media levels) and user involvement (CMC-user vs. user, HCI-user vs. media); there are two dependent variables: Cognition of spatial and temporal levels. This research also seeks the associated variables relationship among those variables through the structural equation model (SEM). The 307 data was collected and analyzed to test the research question. The results show that the dimension of the media side's interactivity affected media's usage time and space perception. There are 2 ~ 2 factors variables to affect time and space. One is human and media interaction (HC1) and human to human communication (CMC); the other is traditional mass media (one-way communication) and interuet media (two-ways communication). The results prove the user's perception for media time and space is based on the levels of interactivity. The levels of interactivities depend on media usage: one-one, one-many, synchronous, asynchronous, interpersonal, and social network communication. Online media provides greater social space; while traditional media tends toward para-space perception. On the other hand, the users' time cognitions between online media are different such as fixed time versus cyber-time. 展开更多
关键词 construal time SPACE human and media interaction (HCI) human to human communication (CMC) interactivity media space (a) synchronous HYPERTEXT
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