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关键词： 文件关联   类标识符   文件属性   VS  

摘要： 看了上述的介绍,可能有读者会觉得类标识符与文件关联的作用很类似。的确,从功能和表现形式上来说,两者都很类似,但两者的区别也比较明显:类标识符具有唯一性,它是判断文件属性的标准,Windows正是通过此唯一的类标识符来找到外壳扩展处理程序的。例如判断当前文件是是本文件还是avi文件就可以根据注册表中的类标识符进行判断(注意:Windows系统并不是完全根据文件后缀进行判断文件属性的);文件关联则具有多样性,通过设置可以把一种文件类型关联到多个程序,例如txt文本可以通过文件关联

关键词： 信息技术  

标准号: ITU-T X.680 AMD 1-2003

关键词： 高宽比   数字的   印刷   定义   数据交换   彩色印刷   数据输出   成象   标识符   数据格式   数字数据   PDF格式  

标准号: ISO 15930-4-2003

摘要： This part of ISO 15930 specifies the use of the Portable Document Format (PDF) Version 1.4 for the dissemination of complete digital data, in a single exchange, that contains all elements ready for final print reproduction. CMYK and spot-colour data are supported in any combination.

关键词： 运算符   Verilog   语句   赋值  

关键词： OPC   活动状态   读写   属性   标识符   集合对象   浏览器   服务器   名称空间   句柄   技术介绍  

关键词： INDUSTRIAL development projects   CHEMISTRY -- Societies, etc.  

摘要： The international union of Pure & Applied Chemistry (IUPAC) is engaged in aproject to develop a set of mathematical rules for converting graphical representations of thestructures of compounds to unique and unambiguous digital codes. The codes, known as IUPAC ChemicalIdentifiers (IChIs), are alphanumeric text *** aim is to employ digitized versions of thestrings as nonproprietary digital object identifiers (DOIs) of compounds that can be used inprint-edand electronic sources of chemical data and information.

关键词： Oracle   个性化   Java   开发工具   Oracle9i   JDeveloper9.0.3  

关键词： Java开发工具   JBuilder8   Borland公司  

关键词： control systems   control effect   reference model   Closed loop control systems  

摘要： The convergence properties of the mismatch in identification in a closed-loop control system are used to formulate additional simplified adaptability conditions for improving the well-known conditions for control systems with an identifier and reference model. These conditions admit considerable variations for the estimates of the control effectiveness matrix in the neighborhood of their exact values, thereby corroborating the possibility of using the adaptation scheme for a wide class of objects. An illustrative example is given.

关键词： optoelectronic system   portable color identifier   spoken message   visually handicapped  

摘要： A hand-held color-identifier for blind, color-blind and vision-impaired people has been developed. Color data are obtained by balancing the relative intensities of RGB primaries. After a training period, the system is able to identify any arbitrary number of colors. The output is a spoken message, chosen from a preset list. (C) 2002 Wiley Periodicals, Inc.