随着网络的发展,数字媒体文件的盗版问题的日益泛滥,Microsoft Windows Media 9在编码过程中提供了对数字权限管理(DRM)的支持,可实现对数字媒体文件的加密保护。该文简要介绍了Microsoft的DRM技术原理及工作流程,叙述了如何采用DRM技...随着网络的发展,数字媒体文件的盗版问题的日益泛滥,Microsoft Windows Media 9在编码过程中提供了对数字权限管理(DRM)的支持,可实现对数字媒体文件的加密保护。该文简要介绍了Microsoft的DRM技术原理及工作流程,叙述了如何采用DRM技术保护网站上的音频和视频资料。重点描述了如何基于Windows Media Rights Manager SDK创建认证服务器,提供认证许可的发放及身份的验证,如何基于Windows Media Encoder SDK 创建一个数字权限管理(DRM)系统来生成密钥、打包、加密和发行数字媒体内容。展开更多
Zinc oxide has a large energy gap and thus it has potential application in the field of solar cells by tuning the absorption of sunlight. In order to enhance its absorption of sunlight,dark color zinc oxides have been...Zinc oxide has a large energy gap and thus it has potential application in the field of solar cells by tuning the absorption of sunlight. In order to enhance its absorption of sunlight,dark color zinc oxides have been prepared by traditional hydrothermal method directly using a zinc foil as both source and substrate. We found that we could tune the optical properties of ZnO samples by changing the temperature. In particular, increasing temperature could significantly reduce the reflectivity of solar energy in the visible range. We speculate that the phenomenon is relevant to the sharp cone morphology of the ZnO nanorods grown on the surface of Zn foils, which furthermore enhance refraction and reflection of light in the nanorods. The capacity to improve the light absorption of ZnO may have a bright application in raising the efficiency of solar cells.展开更多
文摘随着网络的发展,数字媒体文件的盗版问题的日益泛滥,Microsoft Windows Media 9在编码过程中提供了对数字权限管理(DRM)的支持,可实现对数字媒体文件的加密保护。该文简要介绍了Microsoft的DRM技术原理及工作流程,叙述了如何采用DRM技术保护网站上的音频和视频资料。重点描述了如何基于Windows Media Rights Manager SDK创建认证服务器,提供认证许可的发放及身份的验证,如何基于Windows Media Encoder SDK 创建一个数字权限管理(DRM)系统来生成密钥、打包、加密和发行数字媒体内容。
基金supported by the National Natural Science Foundation of China(No.11575187)the National Key Research and Development Program(No.2016YFB0700205)
文摘Zinc oxide has a large energy gap and thus it has potential application in the field of solar cells by tuning the absorption of sunlight. In order to enhance its absorption of sunlight,dark color zinc oxides have been prepared by traditional hydrothermal method directly using a zinc foil as both source and substrate. We found that we could tune the optical properties of ZnO samples by changing the temperature. In particular, increasing temperature could significantly reduce the reflectivity of solar energy in the visible range. We speculate that the phenomenon is relevant to the sharp cone morphology of the ZnO nanorods grown on the surface of Zn foils, which furthermore enhance refraction and reflection of light in the nanorods. The capacity to improve the light absorption of ZnO may have a bright application in raising the efficiency of solar cells.
