Abstract:
La présente invention se rapporte à un procédé de caractérisation d'un copolymère d'éthylène et d'acétate de vinyle (EVA) utilisant une technique d'analyse par caloriméthe différentielle (DSC). Ce procédé consiste à déterminer une ou plusieurs valeurs de caractéristique (s) dudit échantillon de copolymère d'EVA, dont une est un niveau de réticulation dudit échantillon. Le procédé selon l'invention permet de déterminer non seulement le taux de réticulation, mais aussi le taux d'acétate de vinyle et la masse moléculaire d'un échantillon d'EVA, de manière simple, rapide, facile et précise.
Abstract:
The present invention relates to gas sensors using doped ferroelectric materials. The sensors can be fabricated as an array where different portions of the array can operate at different independently controlled temperatures to detect different gas phase components of a gas sample. Preferred embodiments can be used for the diagnosis of conditions, such as, diabetes.
Abstract:
A method for testing the performance of catalysts used for conversion of FCC regenerator gases comprises subjecting the catalyst simultaneously to a mixture of gases including an oxidizing gas and a reducing gas in more than one cycle in which the ratio of the oxidizing gas to the reducing gas varies over the time of the cycle. Test gases comprising O 2 , CO, CO 2 , steam, nitrogen-containing gases and sulfur- containing gases in which the ratio of O 2 to CO varies over time for each cycle and in which the products of combustion formed during each cycle can be measured periodically over the cycle yields important data on the usefulness of the catalysts for treatment of regenerator flue gas.
Abstract:
La présente invention concerne une amélioration de la méthode d'analyse par chromatographie en phase gazeuse en ligne d'une phase essentiellement gazeuse provenant d'un atelier industriel de polymérisation d'oléfines.
Abstract:
A process is disclosed for testing material libraries, in particular catalysts, by means of coupled use of at least two analytical methods, preferably IR thermography and mass spectrometry. The rapid integrated determination of potentially "good" materials via IR thermography prevents an excessive loss of time by needing to test all materials of a library successively with the mass spectrometer. The reactor design permits, firstly, the integral recording of the entire reactor through a window which is transparent for the corresponding method and, secondly, permits the simultaneous, automated application of a second analytical method (for example mass sepectrometry) to selected materials of material library, which have been rated as active by the optical method. In the case described, the optical method provides information on the material activity for a set problem, and the second analytical method determines the selectivity of the materials.
Abstract:
A test for determining the bioavailable fraction of an organic pollutant present in soil comprises determining the fraction of the organic pollutant present in the soil which may be extracted by a cyclodextrin or derivative thereof.
Abstract:
A sensor device can include a transition metal complex capable of interacting with a carbon-carbon multiple bond moiety. The sensor can detect the fruit-ripening hormone ethylene with high sensitivity.
Abstract:
The present invention relates to methods for qualifying material for using in the cleaning of alkylene oxide equipment. Qualified material is not expected to contribute to the formation of determinable amounts of alkylene oxide by-products. Methods of cleaning alkylene oxide equipment, and alkylene oxide processes incorporating these methods are also provided.
Abstract:
Measurements of the squalene content in oil-in-water emulsions can be used as a way of checking for problems during production. In particular, it has been found that a drop in squalene content can indicate that filtration problems occurred. Testing the squalene content in the final lots is easier than investigating the characteristics of the filter, and so a squalene assay simplifies the quality control of oil-in-water emulsions.
Abstract:
The invention relates to a method for automatically determining the inorganically and/or organically bound carbon contained in an aqueous cleaning solution, comprising the following program-controlled steps: a) drawing a sample from the cleaning solution with a predetermined volume, b) optionally, liberating the sample from solids and/or homogenising the sample, c) optionally, diluting the sample with water according to a ratio which is predetermined or determined as a result of a preliminary determination, d) determining the inorganically and/or organically bound carbon using techniques known per se, e) transferring the result of the determination to a remote location and issuing it, and/or saving the result on a data support and/or using it as a basis for further calculations. The invention also provides a program-controlled or externally initiated automatic method for checking the measuring device. Measures for protecting the bath can be introduced in a program-controlled manner or by external initiation.