β Scribed by J.R. Bourne; M. Zabelka
No coin nor oath required. For personal study only.
-Classlficatlon occurs when the mean residence ttme of a crystal of size L, r(L), differs from that of the hqud m the crystal&x The classlficatlon function p = r/s(L) charactenses th1.s difference and, when coupled with the population balance, predxts the crystal size dlstrlbutlon produced m d classlfymg crystalhzer This 1s exemphfied here for size-dependent growth kmetux as well as when growth dlsperslon occurs A contoured-base tank, characterlsed by a constant cross-section for magma clrculatlon and unusually mild agltatlon, was operated contmuously In 13 runs potash alum was crystalhzed under MSMPR condltlons, while m 17 runs lower stirrer speeds induced classlficatlon of the type r(L) 2 r No dlscontmultles m growth and nucleation kinetics were observed The mean crystal size increased substantially, while the coefficient of variation rose only shghtly m the classified regime Classlficatlon had to be taken mto conslderatlon when predlctmg the crystal size distribution The classification function of potash alum crystals could not be predlcted by measurmg p for glass beads having the same settling rates The hmltmg step m completely mlxmg the suspenstons was hftmg partxles out of the boundary layer on the tank base 533 CES Vd 35 No LA
π SIMILAR VOLUMES
\_Encouragement to Soience, etc. 229 British Encouragement to Science.--An influential deputation of members of Parliament lately waited on the Chancellor of the ]~xchequer, to advocate the claims of the Scottish Meteorological Sqciety. Sir Stafford Northeote said that the Treasury was prepared to g
## Abstract The influence of Ni on the crystallinity and thermal stability of calciumβnickel hydroxyapatite solid solutions was studied by xβray diffraction, infrared and Raman spectroscopy and thermal and chemical analysis. The data reported confirm the assumption that nickel produces a reduction