A numerical model is developed for qwnlimively d y r h g combined conductive and radiative heat transfer in concenhic annulor packed be&. A packed bed is considend to be a continuous medium for heat transfer, but the porosity dishibulion within a packed bed is taken info account. lb examine the validily of the proposed model, combined conductive and radiative heat hunsfer through annulnr packed be& of coderite or porcelain beads b d y u d numerically using finite diflertnces under condiIions corresponding to heat transfer experiments of these packed be&. The resullnnt fempemhm pmJiles and heat hnnsfer chamctcristics are compand with the experimental resulls.

No abstract

After repeated shallow discharging and overcharging of nickel or cadmium capacity‐limited cells, a working voltage lowering of the discharge curve was observed. The magnitude of the lowering was higher in the nickel capacity‐limited cells. The x‐ray diffraction pattern of the charged‐state normal nickel electrode contained diffraction peaks due only to β‐NiOOH. A charged‐state nickel electrode showing a lowered discharge voltage had diffraction peaks due to γ‐NiOOH, in addition to those due to β‐NiOOH.This may be a cause of the memory effect observed in practical nickel‐cadmium batteries.

Investigation of the leaching resistance of radioactive Cs and Sr immobilized using crystalline proton-type zirconium phosphate (HZr2(PO4)3) was carried out. The leaching rate of Cs and Sr ions from a (0.3 Cs + 0.15 Sr) / HZr2(PO4)3 immobilized material (the amounts of immobilized Cs and Sr were approx. 30 wt% and 6 wt%) was less than 10-4 g m-2 day-1 in both sea water and 1 mol dm-3HCl at 433 K in an autoclave.

Possible Cause of the Memory Effect Observed in Nickel-Cadmium Secondary Batteries. -The magnitude of working voltage lowering of the discharge curve observed after repeated shallow discharging and overcharging of nickel or cadmium capacity-limited cells is higher in the former cells. These cells show X-ray diffraction peaks characteristic for γ-NiOOH in addition to those for β-NiOOH, the sole component of charged-state normal Ni electrodes. The voltage lowering which appears to correspond to the first stage of the classic memory effect in practical batteries, thus seems to be attributable to γ-NiOOH formation in the Ni electrode. -(SATO, Y.; ITO, K.; ARAKAWA, T.; KOBAYAKAWA, K.; J.