广州市春季大气颗粒物的粒径分布及能见度研究   总被引：7，自引：0，他引：7  

张涛  陶俊  王伯光  张仁健 《中国科学院研究生院学报》2010,27(3):331-337

于2008年春季采用粒径谱仪和自动气象站等高分辨率仪器对广州城区大气颗粒物的粒径分布特征及其与大气能见度的相互关系进行研究.结果发现,0.5~20μm粒径范围的颗粒物数浓度随粒径增大而逐渐减小;质量浓度谱分布呈双峰型,分别在0.7μm和2.5μm出现峰值;而降雨对粗颗粒物的去除作用显著.0.5~2.5μm粒子浓度增加是大气能见度降低的重要原因.  相似文献   

From budget allocation to collection development: A system for the small college library     

《Library Acquisitions: Practice & Theory #》1993,17(2):183-189

Research has shown that faculty involvement in library collection development is directly proportional to the size of the library collection itself; specifically, as library collection size increases, faculty involvement in library collection development decreases. Conversely, the opportunity for faculty involvement in library collection development is enhanced in the small-college setting where collection development is a collaborative effort between the faculty, who serve as the counterparts of subject bibliographers in larger university settings, and librarians, who both oversee the collection development process and serve as bibliographers in general and interdisciplinary subject areas. The case study documents the collection development philosophy, selection and acquisitions policies, and accounting procedures used at the Iris Holt McEwen Library and LaRose Resources Center at Elon College in North Carolina. The interrelatedness of selection, acquisition, and accounting processes as well as the collaboration between librarians and faculty in collection development are emphasized. A time line for the collection development process is included.  相似文献   

元典命题与人文素质教育课程的建构     

刘增合 《复旦教育论坛》2006,4(2):44-48

元典文化是近年来史学界提出的一个概念,尽管学界对其科学性仍有争议,但它对人文素质教育课程的建构却极具启发意义。既往人文素质教育的实践中越来越形成一种“路径依赖”,也就是注重从元典文献这一角度来构筑人文素质教育的资源体系。从整体上看,使用和挖掘元典教育资源似乎更应该把握核心性文献,以及后来者对其经典解释。设计人文教育课程体系时,可以借鉴“经——论——律”的逻辑序列来构建元典教育的基本架构。  相似文献   

女性主义不能失去价值目标!--论性别审美意识形态的几个主要特征     

万莲子 《湖南师范大学社会科学学报》2006,35(1):88-92

性别审美意识形态架构是文化政治生态文明建设中的一部分,它关注的是如下的情形：1）性别关系申的人性尺度;2）社会运行中的双性构成——公民社会发育程度;3）日常社会中性别平等惯性思维的确立与否,性别平等社会风化的形塑进程;4）由性别歧视生发开来的社会公正公平理念幅度大小;5）由双性构成的社会实现人道、正义共识的基础如何。  相似文献   

A new data mining method for time series in visual analysis of regional economy     

《Information processing & management》2022,59(1):102741

In order to improve the effect of visual analysis of regional economy, this paper uses machine learning algorithms to analyze time series data, uses various models and methods of intelligent data analysis to mine data laws from huge data, statistical data reports, and find problems in economic development. Moreover, this paper combines the time series algorithm to design and plan the functional structure of the system, and design a separate module structure from the actual situation of regional economic analysis, and build a model system from the overall structure. After constructing the system, this paper tests the system. From the results of the experimental research, we can see that the regional economic visualization system based on time series constructed in this paper has perfect system functions and can meet the needs of regional economic analysis.  相似文献