A review is given of the neutron scattering as a powerful method for the study of the properties of matter. Special emphasis has been made on the application and technique of the scattering of neutrons whose energies are lower than the conventional thermal energies. Some possibilities of further developments in this field are also pointed out.
Grain size is a rough measure of physical properties in steel. In the present paper, several parameters of the grain size or shape are compared in the elongated, neutral and compressed regions of a bent steel bar. The maximum grain diameter was a useful parameter to describe quantitatively the deformation of the grain. The contour maps of the parameters in the three regions illustrated the remarkable heterogenity of the deformation.
Grandjean cloisons and color bands were observed with a Cano wedge arrangement containing a liquid crystal mixture (cholesteryl chloride/p-methoxybenzylidene-p-n-butylaniline). From these observations the helical pitch and optical rotatory power were determined as functions of temperature and concentration and de Vries' formula for rotatory power has been confirmed.
A field-emission shadow microscope was constructed and its characteristics were exa-mined with a field-emitter tip as a specimen. Change of the shadow image with the ratio of object tip potential to projector tip potential is presented and a qualitative explanation given. The potential ratio which gives the best shadow image and the magnification M are presented as a function of projector-object spacing d. It is confirmed that M is approximately given by D/d, where D is a projector-fluorescent screen distance. The distortions of the shadow images are briefly discussed.
An application of an on-line minicomputer system to the correction of waveform distortion due to finite instrumental resolution is described. The system primarily consists of a mini-computer, a digital cassette magnetic tape recorder and basic peripheral devices. The deconvolu-tion procedure for the resolution enhancement is carried out by means of iterative techniques such as point-Jacobi, Burger-Cittert and Gauss-Seidel method, because of the simplicity of the algorithms and the adaptability to small computers. The details of the computer programs are presented together with the results in practical applications to absorption and emission spectroscopic measurements.