A microspectroscopic study of the electronic homogeneity of ordered and disordered Sr2FeMoO6

Disordered Sr₂FeMoO₆ shows a drastic reduction in saturation magnetization compared to highly ordered samples, moreover magnetization as a function of the temperature for different disordered samples shows qualitatively different behaviours. We investigate the origin of such diversity by performing spatially resolved photoemission spectroscopy on various disordered samples. Our results establish that e_xtensive electronic inhomogeneity, arising most probably from an underlying chemical inhomogeneity in disordered samples, is responsible for the observed magnetic inhomogeneity. It is further pointed out that these inhomogeneities are connected with composition fluctuations of the type Sr₂Fe_1+x Mo_1-x O₆ with Fe-rich (x > 0) and Mo-rich (x < 0) regions. Dedicated to Prof J Gopalakrishnan on his 62nd birthday.     

用超滤法处理回用生活污水

研究了用超滤法处理山西铝厂生活污水站出水的阻力特性及清洗可恢复性,通过试验对比了颗粒活性炭、微滤 颗粒活性炭和混凝进行处理污水后的超滤效果.试验结果表明,污水经微滤 颗粒活性炭预处理后,可以得到较好的过滤效果,过滤阻力低;用质量浓度为500mg/L的NaClO溶液反洗浸泡后可以得到较好的清洗效果;混凝可以去除悬浮物、胶体及污水中的部分有机物,明显降低了膜过滤阻力;超滤的产水水质符合生活杂用水标准GB JXX—2001的要求.     

电磁相分离法制备自生表层复合材料

采用电磁相分离法制备出以初生富铁相（AlSiFeMn复杂金属间化合物）为增强相，表层硬度为HB62．25，基体硬度为HB59．00的Al-11.70%Si-1.20?-1.50%Mn合金自生表层复合材料，增强相的显微硬度为HV 842。87，大小为20－80μm，该表层复合材料同基体材料相比，耐磨性提高了57．41％，所用方法工艺过程简单，成本低，为解决材料在服役环境中不同部位，不同性能的问题提供了新途径。     

Formation of Supersonic Zones and Local Separation Zones in Transonic Steady-State Flow Past Surface Roughness in the Free Interaction Regime

Within the framework of free interaction theory numerical methods are used to investigate the occurrence of supersonic zones with shocks in the outer inviscid region for flow past roughness in the lower viscous sublayer, with and without the formation of local separation zones.     

Mg,Si和S同位素链的壳反常

采用考虑轴向形变的相对论平均场理论,以双中子、双质子分离能隙δ_2n/δ_2p作为壳封闭的特征,分析了Mg,Si和S同位素链的壳封闭和壳反常,发现Mg同位素链在N=12,16处,Si同位素链在N=14,S同位素链在N?=16处出现明显的壳封闭结构,Si同位素链在N=28处壳层结构并没有消失.Mg,Si和S同位素链在N=20处壳效应并不太明显.     

乳化液膜法净化湿法磷酸除镁研究

采用乳化液膜技术对湿法磷酸进行脱镁净化是一种净化湿法磷酸的新途径。采用正交试验设计方法组织实验，结果表明在实验研究范围内，萃取剂对湿法磷酸中脱镁效果有高度显著的影响，而表面活性剂、膜试剂和反萃取剂对镁的脱除有一定影响。     

Dual Problems and Separation of Sets: Lagrange and Fenchel Duality

An extremum problem is embedded in a parametric scheme which contains, as a particular case, the classic perturbation function. The introduction of the image of the embedded problem allows one to derive a generalized duality and, in particular, Lagrangian and Fenchel duality.     

一个非协调膜元的高精度分析

本文讨论一个四自由度三角形非协调膜元的整体超收敛性，外推和亏量校正。