摘要:
An ionization current detector of improved efficiency includes facilities for directing heated nitrogen gas upward against a test sample, which is disposed on an aligned periphery of a rotary conveyor. The gaseous product resulting when the test sample is volatilized by the hot nitrogen is in turn sucked upward into a partial vacuum formed in an overlying, axially aligned nozzle having a venturi-like construction into which heated hydrogen gas is introduced. The hydrogen gas thereby admixed with the gaseous sample is ignited by the further application of forced air at the output of the nozzle, and the resulting hydrogen flame ionizes the sample. A pair of electrodes positioned above the air inlet measures the ionization current increase in the detector caused by the ionization of the sample.
摘要:
The apparatus comprises a vertical vessel provided with a rotating gas-feed unit for maintaining powders in a fluidized state. The rotating gas-feed unit is provided above the bottom of the vessel with at least one tube extension terminating in a nozzle. The gas-feed unit may contain a plurality of tube extensions with nozzles, the tube extensions having different lengths and being bent in such a way, that the longitudinal axis of the nozzles forms an angle of 0* - 90* with respect to a radial direction passing through the nozzle opening in the direction of nozzle rotation and an angle of 0* - 45* in the same plane in the direction towards the bottom of the vessel. The vessel can be provided by several gas-feed units to which mixer blades may be attached.
摘要:
STRONG, ELASTIC HYDROGELS ARE MADE BY COPOLYMERIZING ACRYLONTRILE OR METHACRYLONITRILE OR MIXTURES THEREOF WITH CO-MONOMERS HAVING HYDROPHILIC SIDE-GROUPS, SUCH AS ACRYLAMIDE, METHACRYLAMIDE, ACRYLIC ACID, METHACRYLIC ACID AND VINYL PYRROLIDONE OR WITH MIXTURES OF SUCH CO-MONOMERS. THE COPOLYMERIZATION IS CARRIED OUT IN PRESECE OF FREE RADICALS AND IN AN INORGANIC SOLVENT WHICH DOES NOT UNDERGO ANY SUBSTANTIAL CHAIN TRANSFER SUCH AS CONCENTERED AQUEOUS ZINC CHLORIDE SOLUTION OR NITRIC ACID.
摘要:
METHOD OF CATALYZED ESTERIFICATION OF BENZENE CARBOXYLIC ACIDS, SUCH AS TEREPHTHALIC ACID, OR MIXTURE THEREOF WITH OTHER AROMATIC, ALIPHATIC AND ALICYCLIC CARBOXYLIC ACIDS USED AS MODIFYING ADDITIVES IN THE PREPARATION OF POLYESTER FIBERS, WHEREIN TO A MIXTURE OF TEREPHTHALIC ACID OR TO A MIXTURE OF ACIDS CONTAINING AN APPROPRIATE AMOUNT OF AN ESTERIFICATION CATALYST AND AN INERT DILUENT, WHICH MIXTURE IS HEATED TO THE BOILING TEMPERATURE UNDER ATMOSPHERIC OR SUPERATMOSPHERIC PRESSURE, ETHYLENE GLYCOL IS ADDED SUCCESSIVELY OR CONTINUOUSLY SO AS TO ENSURE A LOW CONCENTRATION OF FREE GLYCOL IN THE REACTION MIXTURE DURING THE REACTION AND A SUBSTANTIALLY CONSTANT REACTION RATE.
摘要:
A method of protecting glass from becoming fogged by water or ice from condensed water vapour of the ambient atmosphere. The glass has applied thereto at least on one surface at least one coating comprising a hydrophilic polymeric salt having one ion covalently bonded and the other free. This coating is conveniently applied upon an intermediate base comprising a hydrophobic polymer which has good adhering properties with the glass surface.
摘要:
APPARATUS FOR CHROMATOGRAPHIC DETECTION INCLUDING MEANS FOR TRANSFERRING A PHASE SEPARATED IN A CHROMATOGRAPHIC COLUMN FROM SAID COLUMN TO A DETECTOR; THE TRANSFERRING MEANS COMPRISES A ROTATING BODY WITH A COLLECTING SURFACE RECEIVING THE SEPARATED PHASE FROM THE COLUMN AND CONVEYING IT TO THE DETECTOR FOR EVALUATION.
摘要:
NEW POLYMERS AND COPOLYMERS CONTAINING SILVER AND/OR COPPER, USEFUL E.G. IN MANUFACTURING DIALYSE AND FILTRATION MEMBRANES, ION EXCHANGERS, LIGHT SENSITIVE LAYERS, CATALYSTS AND HYDROPHILIC COATINGS, ARE PREPARED FROM COPOLYMERS OR POLYMER MIXTURES CONTAINING BOTH NITRILE GROUPS AND STRONG ACIDIC GROUPS, BY RINGING THEM IN CONTACT WITH MONOVALENT SILVER OR COPPER IONS OR WITH THEIR MIXTURES. SILVER AND/OR COPPER ARE ATTACHED TO NITRILE GROUPS BY SIDE VALANCES, FORMING THUS COMPLEX COMPOUNDS. THE PROBABLE FORMULAE OF THE COMPLEX SIDEGROUPS ARE: -CN.AG+ OR PERHAPS -CN.AG+.NC- AND -CN.CU+ OR PERHAPS -CN.CU+.CU+.NC-, THE COMPLEX CATIONS FORMING POLYMERIC SALTS WIT STRONG ACIDIC GROUPS OF THE SAME OF AN ADJOINING MACROMOLECULE, TO WHICH ALL SAID NITRILE AND STRONGLY ACIDIC GROUPS ARE ATTACHED AS THEIR SIDE SUBSTITUENTS.
摘要:
A terrain probe for scanning time behavior of stress waves in a medium by means of a piezoelectric element mounted in a hollow tubular pointed body. More particularly a constructional arrangement to locate measuring elements for evaluating the stress waves propagating in a medium to be examined. The tubular body includes moreover an electric conductor attached to the piezoelectric element and adapted for transmitting pulses corresponding to the wave characteristics to a recording apparatus. The scanning sensitivity of the piezoelectric element is enhanced in that the frequency of the latter oscillating between the walls of the tubular body is more than two digits higher than the frequency of the waves to be examined.