According to the data released in A Bulletin on the Statistical Analysis of the Chinese Sci-Tech Papers ,this article makes a statistical analysis of the Chinese papers collected by SCI from 1990 to 1999,and challenge...According to the data released in A Bulletin on the Statistical Analysis of the Chinese Sci-Tech Papers ,this article makes a statistical analysis of the Chinese papers collected by SCI from 1990 to 1999,and challenges the rationality of the evaluation result of SCI .展开更多
信息化的发展,使得企事业单位电子文档越来越多,存储分散,用户查找困难,甚至会出现丢失损坏、无法共享等问题。为此,设计了一种基于ASP.NET文档管理系统。本系统采用B/S模式,利用Visual Studio 2008作为开发平台,使用SQL Server 2008作...信息化的发展,使得企事业单位电子文档越来越多,存储分散,用户查找困难,甚至会出现丢失损坏、无法共享等问题。为此,设计了一种基于ASP.NET文档管理系统。本系统采用B/S模式,利用Visual Studio 2008作为开发平台,使用SQL Server 2008作为数据库,实现了电子文档的统一管理、分类统计、在线共享。展开更多
Based on the discussion of relationships between thinning and wind damage, and published information, a method for estimating risk ratios of wind damage was developed. Estimations of risk-ratio for Pinus thunbergii tr...Based on the discussion of relationships between thinning and wind damage, and published information, a method for estimating risk ratios of wind damage was developed. Estimations of risk-ratio for Pinus thunbergii trees and stands were de-duced from stem bending theory and coefficients characterizing wind profile, distribution of branches and optical stratification po-rosity. The results showed that if the value of constant b in the branch distribution-model equals the attenuation coefficient s in the wind profile model for a single tree crown, then the parameter H/D1.33 (height over stem diameter cubed) can be used to compare and evaluate the risk-ratio of wind damage for individual trees. The same method can be applied to stands using the coefficient of wind profile in a stand, i.e. attenuation coefficient , the coefficient from distributions of optical stratification porosity, i.e. extinction coefficient , and the parameter D1.33. The application of parameter H/D1.33 and the process of determining risk ra-tios of wind damage for stands were also given in the paper.展开更多
文摘According to the data released in A Bulletin on the Statistical Analysis of the Chinese Sci-Tech Papers ,this article makes a statistical analysis of the Chinese papers collected by SCI from 1990 to 1999,and challenges the rationality of the evaluation result of SCI .
文摘信息化的发展,使得企事业单位电子文档越来越多,存储分散,用户查找困难,甚至会出现丢失损坏、无法共享等问题。为此,设计了一种基于ASP.NET文档管理系统。本系统采用B/S模式,利用Visual Studio 2008作为开发平台,使用SQL Server 2008作为数据库,实现了电子文档的统一管理、分类统计、在线共享。
基金This study was supported by Innovation Research Project of Chinese Academy of Sciences and the Ministry of Culture and Education Japanese Government.
文摘Based on the discussion of relationships between thinning and wind damage, and published information, a method for estimating risk ratios of wind damage was developed. Estimations of risk-ratio for Pinus thunbergii trees and stands were de-duced from stem bending theory and coefficients characterizing wind profile, distribution of branches and optical stratification po-rosity. The results showed that if the value of constant b in the branch distribution-model equals the attenuation coefficient s in the wind profile model for a single tree crown, then the parameter H/D1.33 (height over stem diameter cubed) can be used to compare and evaluate the risk-ratio of wind damage for individual trees. The same method can be applied to stands using the coefficient of wind profile in a stand, i.e. attenuation coefficient , the coefficient from distributions of optical stratification porosity, i.e. extinction coefficient , and the parameter D1.33. The application of parameter H/D1.33 and the process of determining risk ra-tios of wind damage for stands were also given in the paper.
