PREPARATION AND USE OF 1—ETHOXYCARBONYLALKYLIDENE DIPHENYLPOL YSTYRYLPHOSPHORANES

1－Ethoxycarbonylalkyldiphenylpolystyrylphosphonium triflates can be easily prepared by quaternizing diphenylpolystyryl phosphine with ethyl 2-trifloxyalkanoates;base treatment of these polymer-supported phosphonium triflates affords 1-ethoxycarbonylalkylidenephosphoranes which are stable and undergo satisfactory Wittig reactions.     

STUDY ON THE TREATMENT OF 3—PHENOXY—BENZALDEHYDE INDUSTRIAL WASTEWATER WITH POLYMERIC ADSORBENT

In this paper,the two effluents from PBA (3-phenoxy-benzaldehyde) production process were treated by polymeric adsorbent CHA-111.PBA or PBC (3-phenoxy-benzoic acid) was recovered from the wastewater in the process of neutralization.As a secondary treatment method,adsorption with CHA-111 showed better efficiency than photocatolytic decomposition and solvent extraction.The optimal technological parameters were:adsorption:current velocity:2.0BV/hr(bed volume per hour),room temperature;desorption:current velocity:2.0BV/hr(bed volume per hour),room temperature;desorption:current velocity:1.0 BV/hr,80℃,8% sodium hydroxide aqueous solutions.In conclusion,99.9% COD in the neutralizing wastewater and 98.4% COD in the hydrolysis wastewater are removed successfully.     

折反式大口径三组元红外变焦距系统设计

分别论述了设计红外变焦距光学系统的曲线拟合法和解析法，并设计了大口径、三组元、机械补偿红外变焦距系统，系统的口径为500nm，系统焦距为750nm-3000mm。从计算结果看，设计的变焦距光学系统像面稳定，成像质量良好，接近或达到了衍射极限。     

Absorption Spectra of the 4f Electron Transitions of the Nd,Ho and and Er Complexes with 1—Cyclopyropyl—6—fluoro—1,4—dihydro—7—（4—ethyl—1—piperazinyl）—4—oxo—3—quinoline Carboxylic Acid

The absorption spectra of the neodymium,holmium and erbium complexes with 1-cyclopropyl-6-fluoro-1,4-dihydro-7-(4-ethyl-1-piperazimyl)-4-oxo-3-quinoline carboxylic acid hydrochloride in the presence of TX-100 have been shown. The characteristic absorption bands of the 4f electron transitions of the complexes are enhanced markedly.     

发现钪的尼尔森教授

尼尔森(Lars Fredrik Nilson)1840年5月27日生于瑞典的东约特兰省(Ostergothland).他的父亲(Nicolous Nilson)在哥特兰岛(Gothland)上经营一座农场.青少年时期的尼尔森在这座波罗的海上阳光明媚、风景如画、植被葱郁的岛上度过的难忘岁月,对他性格、爱好的形成,事业的追求,有莫大影响.……     

Universal Class of Criticality of Diluted Strongly Frustrated Systems

Using Monte Carlo simulations,we study the universal classes of criticality associated to the superlattices CddMn1-d Te/CdTe and the spinels ZndCd1-dCr2S[Se]4.Both systems are diluted frustrated antiferromagnets.The ratio d of dilution or substitution is found to greatly influence the nature of criticality.The effect of dimensionality in spin glass transitions is also investigated.