The principle and construction of an automatic stiction tester was described in the previous paper. In the present one, some experimental results are given in regard to stiction-temperature characteristics for various organic films on metal using the same apparatus equipped with a heating device. It is observed that the thickness of film, the method of its preparation and the surface condition of base metal affect the temperature characteristics of film stiction. The values of break-down temperature of film obtained by this method are compared with those by electron diffraction method and with the melting points of corresponding metallic soaps in bulk. Some discussions are, thereby, made on these experimental results. The automatic stiction meter of this type seems also useful as an oiliness tester for practical purposes.
A single-stage Alexander type oil diffusion pump (inside dia. 80mmø) has been constructed, and the variation of the characteristics was measured when the distance between the jet and the inclined wall (30° to the pumping direction) was altered. When the distance is longer than a certain critical length, the true speed of the pump is fairly constant, but becomes gradually smaller when the distance is decreased below the limiting value. On the other hand, the back diffusion at first decreases on reducing the distance, but begins to increase when the distance is made shorter than the critical value mentioned above. Thus there is an optimum distance (60mm_??_70mm) for the operation of such a pump. Maximum Ho-Coefficient obtained so far is about 40%. When the inclined wall is made perpendicular to the pumping direction, however, the characteristics are worse than the former. On the basis of these results, the mechanism and the advantages of Alexander type pump are discussed.
A simple and handy method determining the concentration of pulp solution is described; with a definite quantity of the solution in a beaker, stirred by a propeller, time is measured from the instant at which this propeller is drawn out from this liquid, till this liquid comes to standstill. This time is taken as the measure of the concentration. Some factors gover-ning this time, say, dimension of the beaker, quantity of solution used, initial speed of rota-tion etc. are also considered.
The possibility of measuring the roughness of metal surface by means of electrical capacitance with vinyl sheat as insulator has been confirmed. This method is considered available in practise, for the roughness H from 6 to 200 micron can be measured in a few seconds. By this method the mean space between a specimen and a metal plate is measured which gives the 3-dimensional roughness. The relation between the 3-dimensional and the 2-dimensional roughnesses regarding, for example, the maximum height H or the root mean square (rms), is discussed.
Cubic zinc seleno-sulfide phosphors activated by Cu, Mn, Pb or Bi were prepared and their infra-red spectral-responsivity as well as the spectral distribution of luminescence were investigated. Bi-activated phosphors showed no conspicuous response for infra-red irradia-tion, but Mn- or Pb-activated phosphors showed remarkable stimulation and Cu-activated phosphors stimulation and quenching. Starting with cubic ZnS phosphor and adding increasing proportion of ZnSe, the stimula-tion or quenching bands about 0.8μ and 1.3μ increase their broadening at 2_??_3% ZnSe. The latter band vanishes at 5_??_10% ZnSe and the former one at about 30% ZnSe. The quenching band at about 0.8μ of Cu-activated ZnS phosphor is converted to stimulation band by the addition of about 10% ZnSe. From the above experimental results, a simple model explaining the photo-stimulation and -quenching of these zinc seleno-sulfide phosphors is proposed.