Actinolactomycin 1, a new 2-oxonanonoidal antitumor antibiotic, was isolated from the fermentation broth of Streptomyces flavoretus 18522 through a bioassay-gui
Reaction of activated aromatics containing phenols, naphthol, methoxynaphthalenes,anisole etc. with 1-butyl-3-methylimidazolium tribromide ([Bmim]Br3) under sol
瑶岭钨矿是南岭成矿带粤北梅石瑶矿田中重要的石英脉型矿床,具有中型规模,周边具有矽卡岩型矿化,深部发现了云英岩型矿化,研究瑶岭钨矿的控矿因素对判断矽卡岩型、云英岩型矿
本文将分数阶Gabor变换（FrGT）引入到地震信号的分析与处理中，即利用新近兴起的分数域时频分析技术及其良好的局部时频能量聚集特性，进行地震信号的分数域谱分解及特征分析．论文在
24-Methylenecholest-5-ene-7-oxo-3β,19-diacetate 5 was synthesized starting from stigmasterol via twelve step reactions in 4.1% overall yield. It can be served
The title compounds, PhX2SnCH2CH2CO2Me (X = C1, 1a; Br, lb; I, 1c), readilyunderwent transesterification into the corresponding analogues, PhX2SnCH2CH2CO2R when
铁路便携式信号设备故障记录分析装置是一种铁路信号设备故障的采集记录及分析装置,是对铁路信号集中监测系统的补充和完善。采用便携采集模块及综合采集设备进行现场采集,并
为了满足ARJ21的试飞要求,根据该机型测试参数多,采样率高,测试点分布广等特点,打破以往传统的基于PCM体系的数据采集方式,采用PCM和以太网混合结构的机载测试系统,即在飞机上建立多个测试系统,通过网络技术把各个测试系统联系起来,将机上的各个测试系统的数据进行融合处理,将测试参数提供给试飞工程师。实验证明,该系统满足ARJ21飞机试飞的需求,测试参数达到了各项测试指标。
An rapid and efficient synthesis of 2, 4, 6-triarylpyridines is reported using substituted benzaldehydes, substituted acetophenones and ammonia as starting mate