Energies,fine structures,and transition rates of the core‐excited states in BeII

The energies and fine structures of some doubly excited resonances of lithiumlike beryllium are calculated using the saddle‐point variational method. A restricted variational method is used to extrapolate a better nonrelativistic energy. Relativistic and mass polarization corrections are included. Oscillator strengths, transition rates, and wavelengths are also calculated. The results are compared with other theoretical and experiment data in the literature. © 2000 John Wiley & Sons, Inc. Int J Quant Chem 76: 656–661, 2000     

轨迹成型法加工光学零件磨床中的微进给电控装置的研究

本文提出了一种在轨迹成型法加工光学零件磨床上实现脆性材料超精密磨削的微进给电控装置。试验表明,在轨迹成型法加工光学零件磨床上应用本装置对光学透镜进行磨削后,工件表面粗糙度可达Ｒａ＝０．０２μｍ,能够达到光学零件精磨的粗糙度要求。     

细粒土K_(30)试验分级加载变形稳定标准探讨

分级加载的变形稳定标准是影响K_(30)试验准确性和效率的关键因素。对粉质黏土在最佳含水率下,开展了三组压实系数K分别为0.90、0.95和1.00的小型平板载荷试验,得到不同荷载作用下填土变形时程曲线,分析了分级加载下填土变形的时间效应程度,讨论了不同变形稳定标准对K_(30)值的准确性和试验效率的影响。研究表明:根据"最后1min变形比(1%)"和"变形速率Δs(mm/min)"两种变形稳定标准,K_(30)试验的分级加载时间随时间效应程度分别呈先增长后缩短和加速增长的变化趋势,后者更符合土变形稳定时间与时间效应程度的正相关变化规律;Δs取0.01能降低51%~58%的试验时间,试验误差在6%以内,Δs增大会使试验误差大幅提高,Δs减小则会使试验时间大幅增加;据此,提出了适用于细粒土压实质量检测的级数-时间分级加载控制法。所得成果可为提高细粒土压实质量检测效率提供试验依据。     

Catalytic conversion of defatted rice bran into value added chemicals using copper ferrite: A sustainable approach

The most crucial and demanding universal issue lies in the enrichment of sustainable drive technology. As traditional resource, petrochemical becomes increasingly scarce in the future; mankind must turn to renewable alternatives to yield liquefied fuels and valuable commodities through sustainable process. It has been reported that furan compounds serve as an excellent platform molecule derived from defatted rice bran. The current work aims at the synthesis of copper ferrite nano catalyst by microwave assisted solution incineration approach. The catalytic properties stood verified by X-ray diffraction, SEM, EDAX and BET techniques. The catalytic performance of the copper ferrite catalyst were reinforced through in-situ microwave assisted acetalization reaction of furfural with discrete solvents like methanol, ethanol, and 1-propanol at optimum reaction conditions for the preparation of wide range of commodity chemicals such as carboxylic acids, alkyl esters, di alkyl acetals, di ketones which are of commercial importance. The comparative study of relative yield of the products with different solvents is reported. The formation of the value-added products were confirmed by GC-MS, FT-IR technique. The catalysts from the reaction mixture are recovered by magnetic field.