Other

Chengdu Sk Spruce Technologies Co., Ltd.

Chengdu Skspruce Technology, Inc

Yongcheng Lei

Kaidi Huang

Hua Chen

Yongzhong Lei

Zhifei Zhang

Jiangang Ding

Qinghong Lv

Bingjun Li

Jingli Chi

Yu Wang

A dialkyl carbonate is prepared by reacting urea with an alkyl monohydric alcohol at 70° C. to 150° C. under normal pressure or reduced pressure. The reaction is conducted for 6 h to 30 h under stirring and reflux, with one or more of magnesium, calcium, aluminum, chromium, manganese, iron, cobalt, nickel, copper and zinc as a primary catalyst and one or more compounds including an electron-donating nitrogen, phosphonis, oxygen or sulfur atom as a catalyst promoter. The dialkyl carbonate is prepared under low reaction temperature and normal pressure or reduced pressure, with high selectivity and high yield. With simple operations, high safety and low cost for the process, the method has prominent industrial application prospects.

Method for preparing dialkyl carbonate by alcoholysis of urea

Provided are a network operation support system and a network device management method, belonging to the technical field of communications. The system uses a micro-service architecture realized based on a container, and the system itself has a good expansibility and availability, and supports automation and layout in a cloud environment. In addition, the system also uses a main database to synchronously store operating data of various micro-services for unified maintenance of the data, thereby improving the analysis efficiency of the system.

Network operation support system and network device management method

The present invention provides a method, device and system for maintaining wireless networks, wherein the method includes: an AC receives a wireless access network status parameter fedback by an AP according to a time triggering mode or an event triggering mode; the AC updates the Status Set parameter of the AP locally stored, according to the wireless access network status parameter; the AC updates an event occurrence status parameter of the AP locally stored, according to the updated Status Set parameter and the event update strategy locally stored, wherein the event update strategy refers to an corresponding relationship between the Status Set parameter and the event occurrence status parameter; and the AC maintains the wireless network configuration parameter of the AP according to the updated event occurrence status parameter. By use of the present invention, the problems of a high maintenance cost for artificially maintaining wireless networks and a long maintenance time after a fault occurs are solved, and the stability of the user wireless networks are ensured.

Method, device, and systems for managing access points controlled by an access point controller

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Chengdu, China

Yongcheng Lei