Abstract:
Information storage medium (10) comprising a semiconductor (16) doped with first and second impurities or dopants. Preferably, one of the impurities is introduced by ion implantation. Conductive electrodes (14) are photolithographically formed on the surface of the medium. Information is recorded on the medium by selectively applying a focused laser beam (24) to discrete regions of the medium surface so as to anneal discrete regions of the medium containing lattice defects introduced by the ion-implanted impurity. Information is retrieved from the storage medium by applying a focused laser beam to annealed and non-annealed regions so as to produce a photovoltaic signal at each region.
Abstract:
Apparatus and methods for providing patterns of materials, as for color printing. A support member (30) has groups of surface areas (40A, 40B, etc) with each surface area in a given group (eg 40A) facing generally in a direction different from that faced by the surface areas in any other group (eg 40B, etc), and an energy-modifiable material (41A, 41B, etc) adjacent to the surface areas in each group. Energy (A, B, C) is directed onto the material adjacent to the surface areas in each group in such manner as to substantially modify some of the material without substantially modifying the material adjacent to the surface areas of the other groups. A receiver member (32) may be positioned with a surface (31) thereof adjacent to the groups of surface areas; and a substantial proportion either of the modified materials or of the remaining unmodified materials may be transferred to the receiver surface (31) to form the desired patterns thereon, or electromagnetic radiation (A, B, C) may be directed to the patterns formed by the modified materials and be modulated thereby to project images on the receiver surface (31).
Abstract:
Monomeric collagen is oriented in solution and the orientation is retained in the resulting gel by setting up convective flow paths in the solution during gelation. The convection is induced by uniform peripheral heating of the cold, collagen solution in a small-diameter cylinder. Oriented collagen produced in this manner has excellent wet strength for use in implants for natural reconstruction of body collagen.
Abstract:
Method for fluorinating the surface of a polymeric solid for improving a surface property of such solid while substantially maintaining the bulk physical properties of said solid. This method comprises contacting the polymeric solid with dilute fluoring gas at a temperature not substantially above about room temperature and at a pressure not substantially above about 1 atmosphere for a time adequate to partially fluorinate the solid surface without forming substantially any -CF2-groups.
Abstract:
A method of removing gaseous inclusions from a highly viscous liquid (10) that comprises applying sonic energy, as by means of acoustic horns (11), or other suitable acoustic source, in the liquid (10) at an energy intensity sufficient to induce migration and coalescence of the inclusions in the liquid (10), and less than that required to produce substantial cavitation therein, until the volume density of the inclusions has been reduced to a desired level. Typically the frequency and the energy intensity are selected, and adjusted if necessary, to provide a mode of operation whereby the liquid (10) is subjected to a cyclic component of stress that causes bubbles to collide and form larger bubbles, and to a substantially unidirectional component of stress, due to viscous losses and other mechanisms occurring in an acoustic field (e.g. radiation pressure), that tends to drive the growing bubbles away from the source (11) of the sonic energy and thus to facilitate their movement toward the surface (13) of the liquid (10) and the environs.
Abstract:
Les dimensions physiques d'une chambre de mélange d'air d'admission (2) pour un groupe de chambres de combustion à impulsion (1) peuvent être réduites tout en maintenant des conditions de syntonisation pour la suppression du bruit en construisant la chambre de mélange avec une chambre annulaire (8) ayant des chicanes internes (20, 21) qui rendent la longueur du chemin acoustique au travers de la chambre de mélange annulaire (2) sensiblement plus grande que sa circonférence.