Abstract:
614,542. Glazed articles. LAFARGE ALUMINOUS CEMENT CO., Ltd., and ROBSON, T. D. July 23, 1946, No. 21966. [Class 56] Glazed articles are formed of refractory concrete (as defined below) coated with a glaze which remains sufficiently viscous at the firing temperature to remain on the surface of the article, fired and cooled. The refractory concrete comprises crushed firebrick, building brick, asbestos or the like and a hydraulic cement of high alumina content, and when the articles have set after moulding, air holes &c. may be filled with powdered fired refractory clay. The glaze should have a high melting range which may be obtained by increasing the alumina or aluminium silicate content, e.g. a glaze for clay articles with 60 per cent of fine ground China clay incorporated is satisfactory. A coating of 3 oz. per square foot of the glaze composition ; silica 36.5 per cent, alumina 22.0 per cent, lime 2.5 per cent, ferric oxide 1.0 per cent, lead oxide 23.5 per cent, zinc oxide 11.5 per cent, alkalis 2.0 per cent, may be applied and fired at about 1000‹ C. for at least 3 hours with previously fired concrete or at least 12 hours with unfired concrete. A preliminary coating of China or Ball clay may first be applied to the article, without additional heating, and this clay slip may contain 5-15 per cent of the composition, quartz sand 35 parts, lead oxide 58 parts, and kaolin 7 parts.
Abstract:
Benzoic acid and substituted benzoic acids, or anhydrides thereof, but excluding compounds carrying as substituents hydroxyl amino, alkoxy, aryloxy and carboxyl groups, are converted into the corresponding nitriles by heating with a sulphonamide, e.g. benzene-or p-toluenesulphonamide, at an approximate temperature range of 220-240 DEG C. The reaction is especially applicable to the production of substituted benzonitriles carrying as substituent a sulphone group, R.SO2-, wherein R may represent an alkyl, aryl or aralkyl group. In examples, the following nitriles are obtained by heating the reactants at 225 DEG C. for an optimum period, e.g. 1 1/2 hours, determined by a preliminary test: (1) p-cyanophenyl methyl sulphone, from benzenesulphonamide and p-carboxyphenyl methyl sulphone; p-cyanoethyl-, and p-cyanophenyl propyl sulphones are prepared similarly; (2) pp1-dicyanodiphenyl sulphone, from benzenesulphonamide and pp1-dicarboxydiphenyl sulphone; (3) benzonitrile, from benzenesulphonamide and benzoic acid; (4) p-nitrobenzonitrile, from benzenesulphonamide and p-nitrobenzoic acid; (5) p-nitrobenzonitrile, from toluene-p-sulphonamide and p-nitrobenzoic acid anhydride; (6) 2 : 4-dichlorbenzonitrile, from benzenesulphonamide and 2 : 4-dichlorobenzoic acid; (7) o-nitrobenzonitrile, from benzenesulphonamide and o-nitrobenzoic acid; (8) ammonium p-cyanobenzenesulphonate, from benzenesulphonamide or toluene p-sulphonamide and p-sulphamidobenzoic acid, heated together at 235 DEG C.
Abstract:
Sulphones of the formula R-SO2-C6H4-CH2NH2, wherein R is an alkyl, aralkyl or aryl group are prepared by hydrogenating the cyano phenol sulphone of formula R1-SO2-C6H4-CN, wherein R1 is an alkyl, aralkyl or aryl group. When R1 is aryl it may contain a cyanide group which becomes reduced to an aminomethyl group. In the examples, ethyl-or methyl-p-aminomethylphenyl sulphone or di-(p-aminomethyl phenyl) sulphone are prepared as hydrochlorides by treating with hydrogen in the presence of a Raney nickel catalyst, ethyl- or methyl-p-cyanophenylsulphone or di(-p-cyanophenyl)sulphone respectively, dissolving in dilute hydrochloric acid and concentrating.
Abstract:
The illustrative embodiments described herein are directed to an apparatus and method for managing reduced pressure at a tissue site. The apparatus comprises a pump for supplying reduced pressure for application of reduced pressure to the tissue site and a motor coupled to the pump to propel the pump. The apparatus further comprises a drive system electrically coupled to the motor that includes a power source that provides a source of direct current power to the motor during an operational period at a substantially constant current and of sufficient magnitude to supply a targeted reduced pressure during the operational period. The drive system also includes a controller that monitors the pump's loading on the motor by measuring the voltage across the motor to determine whether the motor voltage remains within a predetermined operational range of voltages necessary for maintaining the reduced pressure supplied by the pump proximate to the targeted reduced pressure without directly measuring the reduced pressure using a pressure sensor.
Abstract:
A reduced pressure treatment system is provided that includes a canister that is fluidly connected to a tissue site and is configured to receive fluid drawn from the tissue site under the influence of a reduced pressure. A reduced pressure source provides the reduced pressure and is fluidly connected to the tissue site by a fluid communication path, which may include a source conduit, the canister, and a target conduit. A sensing device communicates with the source conduit and is configured to sense a pressure in the source conduit. A valve communicates with the source conduit and is configured to vent the reduced pressure. A processing unit communicates with the sensing device and the valve and is configured to open the valve for a selected amount of time, determine a decay of reduced pressure, and determine a fill status of the canister based on the decay of reduced pressure.
Abstract:
A system and method for performing tissue therapy may include applying a reduced pressure to a tissue site of a patient. A fluid parameter associated with applying a reduced pressure to the tissue site may be sensed. An audible fluid leak location sound may be generated in response to sensing the fluid parameter. The audible fluid leak location sound maybe altered in response to sensing that the fluid parameter changes. By altering the audible fluid leak location sound in response to sensing a change of the fluid parameter, a clinician may detect location of a fluid leak at the drape by applying force to the drape. The force applied to the drape may be a clinician pressing a finger onto an edge of the drape.
Abstract:
A reduced pressure treatment system is provided that includes a canister that is fluidly connected to a tissue site and is configured to receive fluid drawn from the tissue site under the influence of a reduced pressure. A reduced pressure source provides the reduced pressure and is fluidly connected to the tissue site by a fluid communication path, which may include a source conduit, the canister, and a target conduit. A sensing device communicates with the source conduit and is configured to sense a pressure in the source conduit. A valve communicates with the source conduit and is configured to vent the reduced pressure. A processing unit communicates with the sensing device and the valve and is configured to open the valve for a selected amount of time, determine a decay of reduced pressure, and determine a fill status of the canister based on the decay of reduced pressure.
Abstract:
A satellite antenna arrangement for a satellite communication system comprising: a reflector for producing a far field pattern with near-zero field strength at a predetermined location to reject unwanted signals from said predetermined location or minimise signal power transmitted to said predetermined location, the reflector having a surface comprising a stepped profile arranged to generate the near-zero field strength in the predetermined location. The stepped profile may comprise a radial step. The location of the near-zero field strength can be steered by moving the reflector or by adjusting the amplitude and phase of an additional beam that covers substantially the same region as the main beam reflected by the reflector.
Abstract:
A satellite antenna arrangement for a satellite communication system comprising: a reflector for producing a far field pattern with near-zero field strength at a predetermined location to reject unwanted signals from said predetermined location or minimize signal power transmitted to said predetermined location, the reflector having a surface comprising a stepped profile arranged to generate the near-zero field strength in the predetermined location. The stepped profile may comprise a radial step. The location of the near-zero field strength can be steered by moving the reflector or by adjusting the amplitude and phase of an additional beam that covers substantially the same region as the main beam reflected by the reflector.
Abstract:
A thermal ablation system comprises a fluid handling unit receiving fluid from a fluid source at a first pressure, the fluid handling unit including a heater heating the fluid to a desired temperature and a pump and an introducer including a sheath which, when in an operative position, is received within a hollow organ, the sheath including a delivery lumen introducing fluid heated by the heater to the hollow organ and a return lumen withdrawing fluid from the hollow organ and returning the withdrawn fluid to the console via a return lumen, wherein the pump increases a pressure of the fluid between the fluid source and the delivery lumen of the introducer.