Abstract:
Copper conductive foil (20) for use in preparing printed circuit boards is electrodeposited from an electrolyte solution (18) containing copper ions, sulphate ions, animal glue and thiourea. The thiourea operates to decrease the roughness of the foil, to enable operation at higher current densities and/or to modify the ductility characteristics of the foil.
Abstract:
Gas diffusion electrodes (12) and gas generating or consuming electrochemical cells (10) utilizing the same. The electrode (12) comprises an electronically conductive and electrochemically active porous body defining respective gas and electrolyte contacting surfaces (15, 17), with an ionomeric ionically conductive gas impermeable layer disposed over the electrolyte contacting surface (17). The layer comprises a hydrophilic ionic polymer cross-linked in situ on said active surface by exposure to an effective amount of high energy ionizing radiation.
Abstract:
Gas diffusion electrodes (12) and gas generating or consuming electrochemical cells (10) utilizing the same are disclosed. The electrode (12) includes an electronically conductive and electrochemically active porous body defining respective gas and electrolyte contacting surfaces (15, 17), with an ionomeric ionically conductive gas impermeable layer covering the electrolyte contacting surface (17). The layer includes a layer of hydrophilic ionic polymer applied directly to the electrolyte contacting surface (17) and a membrane of a hydrophilic ion exchange resin overlying the polymer layer.
Abstract:
A battery system (10, 110) wherein an electrolyte solution of lithium hydroxide dissolved in seawater is circulated through a battery cartridge (11, 111). The system is placed under pressure. A portion of the electrolyte mixture is discharged from the system through a suitable pressure regulating valve (20) while concurrently, fresh seawater is delivered into the system as by a pressurinzing pump (17). The increased pressure acts to increase the density of the gaseous portion of the ejected gas-liquid mixture, reduce the volume of the gaseous portion of the ejected gas-liquid mixture, thereby reducing the total volume of the ejected mixture, and reduce the ratio of gas volume to liquid volume in the system a well as the ejected gas-liquid mixture.
Abstract:
A sealed, rechargeable nickel-zinc cell (10) includes a zinc electrode active mass (30) essentially free of zinc metal when at full discharge, a carboxylated styrene-butadiene binder retaining the zinc electrode mixture in a coherent structure, a predermined amount of cadmium being included in the zinc electrode mixture, a separator (34) preferably comprising at least two layers (42) and (44) of material free of any adhesive binding the layers together and a wicking layer (36) positioned between the nickel positive electrode (32) and the separator.
Abstract:
An electrostatic grey tone printing device having a writing head for use with dielectric paper. The printing device comprises recording electrodes (12) on the writing head having a substantially elongated cross-sectional geometry such that a width dimension W is significantly less than a length dimension L. Complementary electrodes (20) are operatively associated with the recording electrodes and have a predetermined cross-sectional geometry. A means (22) is provided for applying a first voltage of one polarity to one or more of the recording electrodes, and a means (24) is provided for applying a second voltage of opposite polarity to one or more of the associated complementary electrodes. The printing device also comprises a means (32, 36) for advancing the dielectric paper past the complementary and recording electrodes in increments substantially equal to the width of the recording electrodes. The recording electrodes are oriented such that their width dimension W is parallel to the direction of advancing paper. Also, the width dimension of the recording electrodes is sufficiently small to effect the appearance of grey tone areas.
Abstract:
Gas diffusion electrodes (72) and gas generating or consuming electrochemical cells utilizing the same. The electrode (72) comprises an electronically conductive and electrochemically active porous body defining respective gas (82) and electrolyte (84) contacting surfaces, with a substantially gas impermeable layer (106) covering the electrolyte contacting surface (84). The layer comprises an electrolyte insoluble, ionomeric ionically conductive hydrophilic hydrogel (106) formed by coprecipitation between at least first and second precursor polymers.
Abstract:
An edge seal for a lithium or other consumable method anode (12), (42), (62) comprises a hydrophobic, chemically inert polymer coating having a high ratio of flexural modulus to flexural strength, a low Izod impact value, and low elongation properties. The seal is preferably applied to the edge (36), (56), (74) of the anode under an atmosphere of gas which is non-reactive with the anodic metal.
Abstract:
An optical interferometer matrix which includes a reference waveguide (10) for optically transmitting a reference signal. The optical interferometer matrix further includes a signal source waveguide (12) for optically transmitting a source signal which has been modulated with respect to the reference signal in response to an applied physical effect. The physical effect may be, for example, thermal, acoustic, hydrodynamic, electrical, electro-mechanical or magnetic. The reference and signal waveguides (10, 12) are then optically coupled to one another at two different points (38, 40) so that interference between the light in the waveguides occurs under two different phase conditions, with a phase difference between these conditions which approaches pi /2 radians. In the preferred embodiment, the two points of optical coupling are confined in a small space so that thermal- or pressure-induced differential phase changes of light between the first and second coupling points (38, 40) are negligable.
Abstract:
An assembly (10) for adaptively controlling vibration, shock, acceleration and position of an item (12) mounted to the assembly independent of varying operating characteristics of the item or a support base (14) for the assembly. The assembly comprises an item to be controlled (12), a support platform (14) for supporting the item, a viscous spring damper (20) mechanically intercoupled between the item and the platform, first sensor (74) for sensing vibration, shock, acceleration and position of the item, second sensor (76) for sensing vibration, shock, acceleration and position of the support platform, a gas supply source (80) for selectively supplying gas to the viscous spring damper, a fluid supply source (100) for selectively supplying fluid to the viscous spring damper, and a logic control member (78) for adjusting inputs from the gas supply source and the fluid supply source to selectively adjust the operation of the viscous spring damper and the dynamic mechanical coupling of the item to the platform. The invention is particularly applicable as a mechanical coupler system to be used for the support of vibrating machinery on submarines.