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A multi-sensor system is a chemical sensor system which quantitatively and qualitatively records gases with a combination of cross-sensitive gas sensor arrays and pattern recognition software. This paper addresses the issue of data analysis for identification of gases in a gas sensor array. We introduce a software tool for gas sensor array configuration and simulation. It concerns thereby about a modular software package for the acquisition of data of different sensors. A signal evaluation algorithm referred to as matrix method was used specifically for the software tool. This matrix method computes the gas concentrations from the signals of a sensor array. The software tool was used for the simulation of an array of five sensors to determine gas concentration of CH4, NH3, H2, CO and C2H5OH. The results of the present simulated sensor array indicate that the software tool is capable of the following: (a) identify a gas independently of its concentration; (b) estimate the concentration of the gas, even if the system was not previously exposed to this concentration; (c) tell when a gas concentration exceeds a certain value. A gas sensor data base was build for the configuration of the software. With the data base one can create, generate and manage scenarios and source files for the simulation. With the gas sensor data base and the simulation software an on-line Web-based version was developed, with which the user can configure and simulate sensor arrays on-line.
Multi-interface level sensors and new development in monitoring and control of oil separators
(2006)
In the oil industry, huge saving may be made if suitable multi-interface level measurement systems are employed for effectively monitoring crude oil separators and efficient control of their operation. A number of techniques, e.g. externally mounted displacers, differential pressure transmitters and capacitance rod devices, have been developed to measure the separation process with gas, oil, water and other components. Because of the unavailability of suitable multi-interface level measurement systems, oil separators are currently operated by the trial-and-error approach. In this paper some conventional techniques, which have been used for level measurement in industry, and new development are discussed.
This paper presents a two-dimensional-in-space mathematical model of biosensors based on an array of enzyme microreactors immobilised on a single electrode. The modeling system acts under amperometric conditions. The microreactors were modeled by particles and by strips. The model is based on the diffusion equations containing a nonlinear term related to the Michaelis-Menten kinetics of the enzymatic reaction. The model involves three regions: an array of enzyme microreactors where enzyme reaction as well as mass transport by diffusion takes place, a diffusion limiting region where only the diffusion takes place, and a convective region, where the analyte concentration is maintained constant. Using computer simulation, the influence of the geometry of the microreactors and of the diffusion region on the biosensor response was investigated. The digital simulation was carried out using the finite difference technique.
The applicability of differential pulse voltammetry (DPV) and adsorptive stripping voltammetry (AdSV) at a non-toxic meniscus-modified silver solid amalgam electrode (m-AgSAE) for the determination of trace amounts of genotoxic substances was demonstrated on the determination of micromolar and submicromolar concentrations of 3-nitrofluoranthene using methanol - 0.01 mol L-1 NaOH (9:1) mixture as a base electrolyte and of Ostazine Orange using 0.01 mol L-1 NaOH as a base electrolyte.
Novel organic membrane-based thin-film microsensors for the determination of heavy metal cations
(2006)
A first step towards the fabrication and electrochemical evaluation of thin-film microsensors based on organic PVC membranes for the determination of Hg(II), Cd(II), Pb(II) and Cu(II) ions in solutions has been realised. The membrane-coating mixture used in the preparation of this new type of microsensors is incorporating PVC as supporting matrix, o-nitrophenyloctylether (o-NPOE) as solvent mediator and a recently synthesized Hg[dimethylglyoxime(phene)]2+ and Bis-(4-hydroxyacetophenone)-ethylenediamine as electroactive materials for Hg(II) and Cd(II), respectively. A set of three commercialised ionophores for Cd(II), Pb(II) and Cu(II) has been also used for comparison. Thin-film microsensors based on these membranes showed a Nernstian response of slope (26-30 mV/dec.) for the respective tested cations. The potentiometric response characteristics (linear range, pH range, detection limit and response time) are comparable with those obtained by conventional membranes as well as coated wire electrodes prepared from the same membrane. The realisation of the new organic membrane-based thin-film microsensors overcomes the problem of an insufficient selectivity of solid-state-based thinfilm sensors.
"Mit dem "1. Erfahrungsaustausch" im Fachbereich Bauingenieurwesen berichten Absolventen des Fachbereichs aus der Praxis. Mit diesem Treffen wird die wichtige Verbindung zwischen Hochschule, ihren Absolventen und der Berufspraxis zum besonderen Anliegen gemacht und besonders gestärkt." Zitat Prof. Dr.- Ing. Hans Boegershausen, Dekan im Grußwort. Referenten und Themen: Wellmann, Judith: Perspektiven eines Bauingenieurs im konstruktiven Ingenieurbau Dirk Gobbele, Dirk: Planung der Umbaumaßnahme Hauptbahnhof Aachen Kretschmann, Lars: Planung und Bauleitung Buschtunnel Aachen Becker, Astrid: Anlagenmanagement und Aufgaben der DB Netz AG, Bauherrenvertretung und Wirtschaftlichkeit Plenz, Michael: Baurevision und Unternehmensberatung, Tätigkeit als öffentlich bestellter und vereidigter Sachverständiger Klöcker, Alexander: Das Leitungsbauunternehmen – Unternehmerische Strategie als Zukunftssicherung Türk, Roman: Sanierung von Hausanschlüssen Bornebusch, Michael: Hydraulische und Hydrologische Modellsimulationen als Planungswerkzeug für Hochwasser-Schutz-Maßnahmen Himmerich, Jörg : Pipeline Integrity Management System – Probabilistische Bewertung von Bauwerken am Beispiel von Hochdruckleitungen.
Studienbeiträge Die schwere Geburt des Studienbeitragsgesetzes Forschung Erfindungen für die Praxis Antikensammlung inszeniert in geschwungener Ebenenkonstruktion Doppelt hält besser Studium und Lehre Kreative Höhenflüge im Weinberg von Piemont Nach "Bauhaus Europa" jetzt "Kunsthaus Aachen" Beton - Es kommt drauf an, was man draus macht "Ein Stück Raumfahrtsystem" Film ab im Cinekaree Umstellung auf Bachelor- und Master-Abschlüsse beispielhaft Herausragende architektonische Umsetzung geehrt Erdbeobachtung im Taschenformat Die Hygiene im Handgepäck Eintauchen in die Welt von "sub-ten" Symposium zur 1. Flugmesswoche des FB 6 Personen Konsul mit Zeitungsente Der richtige Mann am richtigen Ort Urlaub fürs Ehrenamt 101 und ziemlich weise Goldene Auszeichnung für die Dekanin Wir feiern heute unsere Eliten Eigene Faszination für den Lehrstoff fesselt Studierende Personalia Horst Rambau: Endstation Selbstständigkeit? Der gute Ruf reicht bis Teheran Alumni "Regen ist gut für unser Geschäft" FH-Studenten aus Jülich in der Wissenschaft erfolgreich Miss und Mister FH 2005 International Vor 20 Jahren begann es! "Heute ist ein guter Tag für die Fachhochschule" Service Bologna ist längst bei den Hochschulen angekommen Auch Lehrer lernen nie aus Was ist eigentlich das Freshman-Year "Zeile für Zeile"