Abstract The transformation of form by quantitative distortion of a basic pattern is one aspect of the pattern of form change in general. The study of the relative growth of parts will illuminate this aspect of form change, but not others, such as the complete substitution of one pattern by another, as at metamorphosi…

Calcium Carbonate Crystallization and InhibitionCephalopods and Marine Biology

On the Hall Effect in Ferromagnetics

Emerson M. Pugh、N. Rostoker、A. I. Schindler1950-11-15Physical Review

With precise measurements at magnetic fields well above those required for saturation, it is shown that the Hall electric field per unit current density consists of two distinct parts. Its value averaged between poles is given by ${R}_{0}H+{R}_{1}M$, where $H$ and $M$ are the magnetizing force and average intensity of…

Magnetic Properties and ApplicationsSurface and Thin Film PhenomenaQuantum and electron transport phenomena

Luminescence and Trapping in Zinc Sulfide Phosphors with and without Copper Activator

Richard H. Bube1950-11-15Physical Review

A comprehensive study of ZnS:[Zn] and ZnS:[Zn]: Cu phosphors has been carried out with the use of glow curves, phosphorescence emission decay curves, and spectral distribution curves of emission during excitation by 3650A ultraviolet. The principal contributions of the study are (1) glow curves and spectral emission c…

Advanced Energy Technologies and Civil Engineering InnovationsLuminescence Properties of Advanced MaterialsQuantum Dots Synthesis And Properties

A Small Electron Microscope

John H. Reisner、Edmund G. Dornfeld1950-11-01Journal of Applied Physics

A new electron microscope of greatly simplified design has been constructed. The instrument has a resolution of 100 Angstroms, yet is small enough to be mounted on a desk or laboratory table. Magnetic lenses are energized by permanent magnets. An accelerating voltage of 50 kilovolts is varied over a narrow range to pr…

Electron and X-Ray Spectroscopy Techniques

Studies of the viscosity and sedimentation of suspensions Part 1. - The viscosity of suspension of spherical particles

S G Ward、R L Whitmore1950-11-01British Journal of Applied Physics

After a brief review of the relative viscosity/volume concentration relationships which have been suggested for suspensions of smooth spheres, the results of new experimental work on rigidly defined systems of methyl-methacrylate spheres suspended in aqueous solutions are described and discussed. It is shown that, alt…

Material Dynamics and PropertiesElectrostatics and Colloid InteractionsMicrofluidic and Bio-sensing Technologies