This paper describes an automatic controlled Mössbauer Effect Analyzer using a specially designed electromechanical transducer. Input voltage is integrated by an operational amplifier and its output is fed to the driving coil of the transducer. Negative feedback is applied to get stable action of the transducer. Our proto-type apparatus can be selected either a saw tooth or a parabolic mode according to the object of the experiment. The reliability of this analyzer was ±0.3%. and an attainable maximum velocity was ±50mm/s.
A liquid drop from a capillary, when it is electrified, can take different forms in association, with the amount of electrification. This behavior was studied for 36 kinds of liquids. For the, liquids with electrical conductivity above 10-12 (ohm•cm)-1, the drops tended to be disintegrated and to become mists with increasing an applied voltage. In this case, the disintegration was found. to be strongly affected by the surface charge density of drops. For the liquids with conductivity below 10-12 (ohm•cm)-1, however, the increase of applied voltage only resulted in the increase of the volume of drops, and no mist formation was observed. The results were interpreted as kind of prebreakdown phenomena accompanying mists between needle and plane electrodes.
Using a small neutron tube, a new method for oil-well logging has been developed on a laboratory scale. Because of a pulsed fast neutron (14 MeV., pulse width of about 100 μs., repetition rate 1KHz.) which is injected into a formation, nuclear reaction takes place in the formation and two kinds of prompt gamma rays are emitted: one is the gamma ray resulting from inelastic scattering of neutrons and the other is from capture of neutrons. They are routed towards a gate which is synchronized with a neutron burst. 1) Both kinds of gamma rays are led to a pulse hights analyzer. The discrimination between oil and water-bearing sands is obtained by detecting the difference of counting rates on a gamma ray energy spectrum corresponding to carbon, oxygen and chlorine respectively. 2) Neutron-capture gamma rays are sent to a time analyzer simultaneously and the decay time constants of the thermal neutron in a formation are measured. This serves to reveal the kind of formation fluid and also the degree of porosity. The first is effective for indicating oil sands when the invasion of a mudfiltrate is shallow. The second seems to give the true decay time constant of thermal neutrons in a formation.
The mass fiowmeter of pressure difference type, here reported, resembles Simmonds' mass fiowmeter and the essential difference between them is that the latter has two orifices while the former none. It is found that the theory of Simmonds' mass fiowmeter given by himself is in error, and a correct theory of Simmonds' mass flowmeter is developed in this paper. The mass fiowmeter newly devised is simpler in construction than that by Simmonds. It is experimentally verified that mass flowrate can be obtained by the newly devised mass fiowmeter of pressure difference type.
The alumina films prepared by the electron beam bombardment have good dielectric properties of specific dielectric constant 8.1, specifi resistivity >1014Ω-cm and maximum dielectric breakdown strength of about 3×106V/cm. The current-voltage characteristics of Al-Alumina-Al diode follow an one-carrier space-charge-limited current mechanism for an insulator with traps. The traps lie 0.39eV below the bottom of the conduction band and their density is more than 1017 cm-3. The effective electron mobility increases by an order of 105 when illuminated with ultraviolet light.
Solutions of several cyanine dyes dissolved in methanol have been made to exhibit stimulated emission when excited by a Q-switched ruby laser: The most unusual feature of these dye lasers was their broad spectral distribution. The mode patterns were measured and the beam divergence of a few milli-radians was observed. The wavelength of the intensity maximum of the dye laser was tunable over a large part of its fluorescence band by changing the concentration. For these features with its high conversion efficiency, the dye laser will be one of the most useful means of the frequency conversion of laser beam.