Synthesis and Biological Evaluation of Novel N-Benzoxazolonyluracils as Protox-Inhibitor

Protoporphyrinogen oxidase inhibitor has become the focus research field as herbicides.Seven novel N-benzoxazolonyluracils were obtained by cyclization of 6-aminobenzoxazolone derivatives with ethyl 3-dimethylcarbamoylamido-4,4,4-trifluorocrotonate and then methylation or amination, and the reaction yields were between 59%-86%. The chemical structures of the compounds were identified by Elemental Analysis, MS and ^1H NMR. Biological results indicate that some compounds exhibit excellent control of broadleaf weeds at post-emergence by low dosage 18.75 ga.i/ha, but are not effective for grass weeds below dosage 37.5 ga. i/ha. In addition, these compounds show no damage at high-dosage 150 ga. i/ha to wheat and corn, but are unsafe to dicotyledonous plants such as cole, soybean and sorghum even at lower dosage 18.75 ga. i/ha.     

基于范围经济效应的跨媒体出版战略

跨媒体出版是指通过平面媒体、电子媒体、网络媒体和移动媒体等多种介质提供文字、图片、音频和视频等多媒体信息,跨媒体出版战略是在需求相关性、公共产品、品牌共享、节约成本、资源互补等方面实现范围经济效应。对于出版企业来说,实现跨媒体出版就要围绕企业的优势资源和核心竞争力,打造跨媒体产业链,在流程再造、数字资源管理、跨媒体编辑出版等方面实现战略转型。     

高压C-4204空气压缩机膜片泄漏原因分析与改造

C—4204空气压缩机是乙烯高压装置的重要设备,使用过程中由于膜片泄漏而频繁停车检修,影响了正常生产。对C—4204空气压缩机膜片泄漏的原因进行了分析,并提出具体的改造措施来延长膜片的使用寿命,经过长时间的实际使用,取得了显著的经济效益。