Partially oxidised bis (oxalato) Platinate potassium salt was crystallized by 1) aerial oxidation, 2) electrochamical oxidation in a standing still cell, 3) electrochemical oxidation in a rotating cell. The temperature dependence of d.c. electrical conductivitiy was measured for the obtained single crystals and their results were analyzed applying one-dimensional conductor parameters are related with the ways of crystal growth and a reduced interchain interaction is obtained through a rotating electrochamical cell.
The distribution of sounding pressure level (SPL) in an acoustic levitation furnace (ALF) was measured under low gravity as a function of sounding frequency at different gravity levels ranging from 0 to 2.5 G. The gravity level were produced in an aircraft while traversing special parabolic trajectories. The SPL spectrum exhibited characteristic peaks and the intensity (height) and distribution of which as a function of sound frequency are of primary importance for levitating a material, while SPL peaks height and distribution were found to be independent on gravity at room temperature. They were found to vary with gas temperature at 1 G. The gravity level and the heating condition of ALF affected SPL distribution and peak height. The SPL peak searching ability was investigated during the flight in heating and cooling cycle. The SPL fell down sometimes and failed to serach the paek. THe SPL peak frequency varied with the gas temperature. The SPL was found to vary with the level of gravity, that is, it decreased at entry in theparabolic flight and increased at recovery.
The possibility of realizing an excellent microgravity environment is one of the most important features that attract experimentalist toward space. A difficulty encountered in this connection is that there exist a multitude of acceleration disturbances in thespacecraft which recent research has shown to significantly affect certain experiments such as those on diffusion and crystal growth phenomena, and on fluid behavior. In order to reduce acceleration disturbances, an active vibration isolation system is proposed, which should serve in providing an excellent microgravity environment. The experimental equipment is supported without contact eith the spacecraft structure, by means of electromagnetic suspension and PID controller. The design of the conrtol system and numerical simulations to verify system performance have been conducted.