Abstract: The method described is useful in field flow fractionation techniques for reducing separation times and improving the convenience and accuracy of measuring sizes or molecular weights of particulates. In field flow fractionation, the particulates (particles or macromolecules) are subjected to a force field and a mobile phase while passing through a flow channel. This field strength is decreased exponentially as a function of time. Alternatively the flow velocity is increased exponentially as a function of time. The initiation of the change in field strength or flow velocity may be delayed a period of time. If this time delay is made equal to the time constant of the exponential decay, the range of particulate retention time that is linearly related to the logarithm of the particle size or molecular weight is increased.An apparatus for implementing the method is also described and teaches the use of a function generator for providing the desired exponential decay and delay time.

Abstract: An arrangement for spectrum spreading of a signal for a data transmission link by providing the signal as a bipolar waveform and modulating it on a fast pseudo-random bipolar binary pulse train. In this invention the pseudo-random pulse train is generated at least in part in response to the data signal.

Abstract: A negative-working dry peel apart photopolymerizable element consisting essentially of a photopolymerizable layer between a support and cover sheet, the photopolymerizable layer containing (1) at least two halogen-free polymeric organic binders, (2) a photoinitiator system and (3) at least one monomer present in an amount in excess of the absorptive capacity of the binders for the monomer, at least one polymeric binder which is incompatible in the layer contains 0.5 to 40.0% by weight of polyvinylformal based on the total weight of polymeric binder and is present as a dispersed phase in the layer. The element is useful in color projection transparencies, seismic readout and as photoresists.

Abstract: The speed of monodisperse photographic emulsions made by balanced doubled jet precipitation and converted into a AgBr and/or AgBrI emulsion is increased by ripening in the presence of sulfur compounds at a pH between 8 and 9.5.

Abstract: A coupling assembly for mounting a heating element to an opening in an engine block. The coupling assembly includes a guide member which prevents a blow-out of the coupling assembly from the engine block opening when high pressure is exerted against the coupling assembly. The coupling assembly includes an in-line arrangement of an outer clamping ring, a retainer ring, an O-ring seal, and an inner guide sleeve which are concentrically mounted to a threaded clamping sleeve having fixed at one end an electric heating element sized and shaped for insertion into the engine block through the opening. The O-ring seal and retainer ring are mounted onto the outer periphery of a first annular portion of the guide sleeve and a clamping nut on the threaded sleeve presses the clamping ring and retainer ring against the O-ring to compress the O-ring into sealing engagement with the walls of the opening.

Abstract: Solvent-soluble polymeric esters and polymeric esterethers with radiation-crosslinkable ethylenic unsaturation in the linear polymeric structure, and recurring pendant hydroxyl groups, are derived from monomers which include diepoxides and monomers with at least one .alpha.,.beta.-unsaturated carboxylic acid group. These polymeric products react with cyclic anhydrides to form aqueous alkaline-soluble polymers which are useful as films for photomechanical processes, including lithographic applications and as photoresists.

Abstract: Hot melt adhesive and sealant compositions based on alkali metal ionomers of random copolymers of ethylene, methyl acrylate, and one or more carboxylated monomers have improved high temperature viscosity stability when the composition contains 0.05-10 phr of ammonium polyphosphate.

Abstract: 1-Difluoromethyl-6,7-methylenedioxy-1,4-dihydro-4-oxo-3-quinolinecarboxylic acid and certain of its alkylaminoalkyl esters, useful in treating bacterial infections in mammals.

Abstract: Aqueous foam compositions comprising water and a mixture of ammonium lauryl sulfate, methyl polyoxyethylene cocoamine chloride, dimethyl cocoamine oxide and polyvinyl alcohol are used to suppress the formation of fumes from fumable materials by covering the material with said compositions in the form of foam, thereby causing the material to react with the water to prevent fume release.

Abstract: A long, thin annular belt-like channel is designed for use in sedimentation field flow fractionation. This channel, which may be contained in the rotor of a centrifuge, has a generally rectangular cross-section. It has an inlet positioned to introduce particulates (includes particles and/or macromolecules) approximately at the radial distance from the outer wall that is the equilibrium distance resulting from the average force field exerted on each particulate by the centrifugal force field and by the opposing normal diffusion forces due to Brownian motion. An outlet for the channel is similarly located. A modified design tapers the inlet and outlet.

Abstract: In a medical NMR apparatus it is desirable that the axial magnetic field, Ho, is uniform. The result can in theory be obtained by accuracy of construction but in practice this cannot readily be achieved. It is now proposed to use a field sensing probe system which indicates the value of that field at a plurality of positions in the examined region and provides error signals indicating deviations from uniformity. The field is automatically corrected in response to the error signals by applying currents to field correcting coils. The errors may be considered as distinct gradient and dishing errors which are corrected individually.

Abstract: A long, thin annular belt-like channel is designed for use in sedimentation field flow fractionation. This channel, which may be the rotor of a centrifuge, is designed to maintain its thickness dimension constant by forming the radially inner wall with a radial thickness that is about balanced by the centrifugal pressure of fluid in the flow channel.

Abstract: A long, thin annular belt-like channel is designed for use in sedimentation field flow fractionation. This channel, which is the rotor of a centrifuge, is designed to maintain its thickness dimension constant and yet facilitate its manufacture and cleaning by forming the rotor of a double mating ring in which the inner ring is split. This permits the inner ring to conform to the outer load carrying ring.

Abstract: Amphoteric N-type betaines represented by the formula: ##STR1## wherein: R.sub.f is C.sub.4 -C.sub.20 perfluoroalkyl;R.sup.1 and R.sup.2 are methyl or, together with the N atom to which they are bonded, form a piperidino, morpholino, orN-alkyl(c.sub.1 -C.sub.4)piperazino group; and m is a whole number between 1 and 4 are highly effective in reducing the surface tension of water and of aqueous solutions of inorganic electrolytes, and can be used in environments where non-amphoteric surfactants would fail, e.g. highly acidic oil well applications.

Abstract: Electrically conductive through-holes in a substrate are prepared by (a) laminating a film based plastic photosensitive toner-receptive stratum to at least one surface of the substrate; (b) applying a pressure differential across the stratum covering the substrate holes, the outside pressure exceeding that inside the holes; in either order (c) removing at least one film base or (d) exposing the photosensitive stratum imagewise, (e) adhering metal or catalytic particles to hole walls and image areas, (f) optionally hardening or curing the particulate areas and (g) providing an electrically conductive printed circuit and through-holes, e.g., by plating metal electrolessly, soldering or conjoining the metallized or catalyzed areas.

Abstract: An improvement in the distillative refining of methylamines containing higher amine impurities wherein the higher amines accumulate in the distillation column, tending to cause flooding and product contamination. The improvement involves purging the column at the point the impurities concentrate, mixing the purge with water to form two phases, separating the phases and recycling the water phase for recovery of its methylamines content.

Abstract: A composition is disclosed especially useful for high voltage electrical insulation comprising a blend of polyethylene, an alcohol of 6 to 24 carbons to prevent electrical failure, and polypropylene to mitigate exudation of the alcohol.

Abstract: Process for the preparation of shaped articles of poly(metaphenylene isophthalamide) by simultaneously heating poly(metaphenylene isophthalamide) and applying moderately elevated pressures.

Abstract: Wax-free hot melt adhesive compositions based on a copolymer of an .alpha.-olefin, especially ethylene, with an unsaturated carboxylic acid, especially an .alpha.,.beta.-unsaturated carboxylic acid, or with maleic anhydride and optionally also with another unsaturated carboxylic acid or ester; a tall oil rosin; and a hydrocarbon oil provide good quality bonds. When the level of oil is less than 15%, particularly up to about 13%, there is no oil exudation. The hot melt adhesive compositions of this invention have a good melt viscosity stability when an antioxidant, especially a hindered phenol or organic phosphite, is added. These compositions are useful for heat sealing cartons and for similar applications. Formulations containing tall oil rosins and processing oils approved by the Food and Drug Administration can be readily prepared.

Abstract: A chub cartridge has a tubular chamber containing a water-bearing blasting agent, and a longitudinal tunnel adjacent to the tubular chamber and integral therewith. Preferably, the tunnel is full-length and continuous and has holes for threading a detonating cord therethrough and for holding a cord firmly against the tubular chamber for the cord-priming of the cartridges. In primer assemblies, the tunnel also can be used to hold a cap/booster in place, and for lacing cap wires or a low-energy detonating cord. A preferred cartridge is made continuously in a series by wrapping a web of film having a row of holes along one edge so as to form a tube and an outer flap containing the holes, and sealing the tube and the flap so as to form a tunnel containing the holes in its outer portion, the wrapping being performed so that either the inner or outer portion of the tunnel is circumferentially longer than the other.