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    • 7. 发明申请
    • Biodegradable linear random copolyster and process for preparing it and use of the same
    • 可生物降解的线性随机共聚物及其制备方法及其应用
    • US20060142536A1
    • 2006-06-29
    • US11312373
    • 2005-12-21
    • Wei ChenGuixiang ZhuXirong ChenWei ZhangYifan YanYanxia ZhangJinglan Lu
    • Wei ChenGuixiang ZhuXirong ChenWei ZhangYifan YanYanxia ZhangJinglan Lu
    • C08G63/02
    • C08G63/84C08G63/183Y10T428/2913Y10T428/31786
    • The present invention relates to a biodegradable, random and linear copolyester of high molecular weight and narrow molecular weight distribution, and to process for preparing it and use of the same. The present copolyester has a weight-average molecular weight Mw of 100,000-600,000 g/mol, and a molecular weight distribution of 1.2-3. The copolyester is widely used in the fields of profiles, films, fibers and coatings. The process for synthesizing the polyester described herein comprises the steps of: 1) adding the following monomers and an optional catalyst component Cat1 to a reactor to carry out interesterification and/or esterification: (a) aromatic dicarboxylic acid, ester thereof, anhydride thereof, or mixture thereof, (b) aliphatic diol, alicyclic diol or mixture thereof, and (c) aliphatic dicarboxylic acid, alicyclic dicarboxylic acid, ester thereof, anhydrides thereof, or mixture thereof; 2) prepolymerizing the reaction system obtained in step 1) under vacuum; and 3) adding a catalyst component Cat2 to the prepolymerized product obtained in step 2) to carry out polycondensation under vacuum, thereby obtaining the desired polyester; wherein the catalyst component Cat1 is selected from the group consisting of the compounds of Ti, Sb and Zn, and mixtures thereof; and the catalyst component Cat2 is selected from the compounds of RE and mixtures thereof.
    • 本发明涉及高分子量和窄分子量分布的可生物降解的无规和线性共聚酯,并且涉及其制备和使用方法。 本发明的共聚酯的重均分子量M≤100000〜100,000g / mol,分子量分布为1.2-3。 共聚酯广泛用于型材,薄膜,纤维和涂料领域。 本文所述的合成聚酯的方法包括以下步骤:1)将下列单体和任选的催化剂组分Cat1加入到反应器中以进行酯交换和/或酯化:(a)芳族二羧酸,其酯,其酸酐, 或其混合物,(b)脂族二醇,脂环族二醇或其混合物,和(c)脂族二羧酸,脂环族二羧酸,其酯,其酸酐或其混合物; 2)在真空中预聚合步骤1)中得到的反应体系; 和3)在步骤2)中得到的预聚合产物中加入催化剂组分Cat2进行真空缩聚反应,从而获得所需的聚酯; 其中催化剂组分Cat1选自Ti,Sb和Zn的化合物及其混合物; 催化剂组分Cat2选自RE化合物及其混合物。
    • 9. 发明授权
    • SIP-based network video surveillance system and method
    • 基于SIP的网络视频监控系统及方法
    • US08533346B2
    • 2013-09-10
    • US12884477
    • 2010-09-17
    • Ning CaoMing FengDuguo LiangYanxia ZhangZemin Zheng
    • Ning CaoMing FengDuguo LiangYanxia ZhangZemin Zheng
    • G06F15/16H04N7/18
    • H04N21/643H04L65/1006
    • The present invention provides a SIP-based network video surveillance system and method, which relates to the application field of network video surveillance. The network video surveillance method comprises the steps of: receiving a request message from a client by a call control server (CCS), the request message comprising an ID of a Premises Unit (PU) and a channel ID; forwarding the request message to a center management server (CMS) by the CCS for access authentication; transmitting the request message to the PU by the CCS after the request message passes the access authentication; responding by the PU an acknowledgement message containing video codec information to the CMS via the CCS; forwarding the acknowledgement message containing the video codec information and an access path to the client by the CMS, then establishing, by the client, a video stream connection with a network element directed by the access path on the basis of the acknowledge message. The present invention uses SIP in conjunction with other protocols to build a complete video surveillance architecture, improving the extensibility of a platform and makes the whole system more stable and reliable.
    • 本发明提供了一种基于SIP的网络视频监控系统和方法,涉及网络视频监控的应用领域。 网络视频监控方法包括以下步骤:由呼叫控制服务器(CCS)从客户端接收请求消息,所述请求消息包括房屋单元(ID)的ID和信道ID; 由CCS对中心管理服务器(CMS)转发请求消息进行认证; 在请求消息通过接入认证后,由CCS发送请求消息给PU; 通过CCS向CMS响应包含视频编解码器信息的确认消息给CMS; 将包含视频编解码器信息的确认消息和存取路径发送给客户端,然后由客户端根据确认消息建立由接入路径指导的网络元件的视频流连接。 本发明结合其他协议使用SIP构建完整的视频监控架构,提高平台的可扩展性,使整个系统更加稳定可靠。