TY - CHAP
A1 - Koplin, Tobias J.
A1 - Siemons, Maike
A1 - Océn-Valéntin, César
A1 - Sanders, Daniel
A1 - Simon, Ulrich
T1 - Workflow for high throughput screening of gas sensing materials
N2 - The workflow of a high throughput screening setup for the rapid identification of new and improved sensor materials is presented. The polyol method was applied to prepare nanoparticular metal oxides as base materials, which were functionalised by surface doping. Using multi-electrode substrates and high throughput impedance spectroscopy (HT-IS) a wide range of materials could be screened in a short time. Applying HT-IS in search of new selective gas sensing materials a NO2-tolerant NO sensing material with reduced sensitivities towards other test gases was identified based on iridium doped zinc oxide. Analogous behaviour was observed for iridium doped indium oxide.
KW - Biosensor
KW - High throughput experimentation
KW - gas sensor
KW - metal oxide
KW - doping
KW - impedance spectroscopy
KW - nitrogen oxides
Y1 - 2006
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:hbz:a96-opus-1407
ER -
TY - CHAP
A1 - Sakthivel, Mariappan
A1 - Weppner, Werner
T1 - Response behaviour of a hydrogen sensor based on ionic conducting polymer-metal interfaces prepared by the chemical reduction method
N2 - A solid-state amperometric hydrogen sensor based on a protonated Nafion membrane and catalytic active electrode operating at room temperature was fabricated and tested. Ionic conducting polymer-metal electrode interfaces were prepared chemically by using the impregnation-reduction method. The polymer membrane was impregnated with tetra-ammine platinum chloride hydrate and the metal ions were subsequently reduced by using either sodium tetrahydroborate or potassium tetrahydroborate. The hydrogen sensing characteristics with air as reference gas is reported. The sensors were capable of detecting hydrogen concentrations from 10 ppm to 10% in nitrogen. The response time was in the range of 10-30 s and a stable linear current output was observed. The thin Pt films were characterized by XRD, Infrared Spectroscopy, Optical Microscopy, Atomic Force Microscopy, Scanning Electron Microscopy and EDAX.
KW - Biosensor
KW - Hydrogen sensor
KW - amperometric sensor
KW - porous Pt electrode
KW - chemical reduction method
Y1 - 2006
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:hbz:a96-opus-1399
ER -
TY - CHAP
A1 - Chaiyboun, Ali
A1 - Traute, Rüdiger
A1 - Kiesewetter, Olaf
A1 - Ahlers, Simon
A1 - Müller, Gerhard
A1 - Doll, Theodor
T1 - Modular analytical multicomponent analysis in gas sensor arrays
N2 - 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.
KW - Biosensor
KW - Main sensitivity
KW - cross sensitivity
KW - matrix method
KW - gas sensor array
KW - modelling
Y1 - 2006
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:hbz:a96-opus-1358
ER -
TY - CHAP
A1 - Srivastava, Alok
A1 - Singh, Virendra
A1 - Dhand, Chetna
A1 - Kaur, Manindar
A1 - Singh, Tejvir
A1 - Witte, Katrin
A1 - Scherer, Ulrich W.
T1 - Study of swift heavy ion modified conduction polymer composites for application as gas sensor
N2 - A polyaniline-based conducting composite was prepared by oxidative polymerisation of aniline in a polyvinylchloride (PVC) matrix. The coherent free standing thin films of the composite were prepared by a solution casting method. The polyvinyl chloride-polyaniline composites exposed to 120 MeV ions of silicon with total ion fluence ranging from 1011 to 1013 ions/cm2, were observed to be more sensitive towards ammonia gas than the unirradiated composite. The response time of the irradiated composites was observed to be comparably shorter. We report for the first time the application of swift heavy ion modified insulating polymer conducting polymer (IPCP) composites for sensing of ammonia gas.
KW - Biosensor
KW - Conducing polymer
KW - ammonia gas sensors
KW - swift heavy ions
KW - polymer composites
Y1 - 2006
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:hbz:a96-opus-1345
ER -
TY - CHAP
A1 - Wagner, Torsten
A1 - Schöning, Michael Josef
T1 - Preface of the Special Issue of I3S 2005 in Jülich (Germany)
N2 - International Symposium on Sensor Science, I3S 2005 <3; 2005; Juelich, Germany> In: Sensors 2006, 6, 260-261 ISSN 1424-8220
KW - Biosensor
KW - I3S 2005
KW - International Symposium on Sensor Science
Y1 - 2006
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:hbz:a96-opus-1365
ER -
TY - CHAP
A1 - Poghossian, Arshak
A1 - Schumacher, Kerstin
A1 - Kloock, Joachim P.
A1 - Rosenkranz, Christian
A1 - Schultze, Joachim W.
A1 - Müller-Veggian, Mattea
A1 - Schöning, Michael Josef
T1 - Functional testing and characterisation of ISFETs on wafer level by means of a micro-droplet cell
N2 - A wafer-level functionality testing and characterisation system for ISFETs (ionsensitive field-effect transistor) is realised by means of integration of a specifically designed capillary electrochemical micro-droplet cell into a commercial wafer prober-station. The developed system allows the identification and selection of “good” ISFETs at the earliest stage and to avoid expensive bonding, encapsulation and packaging processes for nonfunctioning ISFETs and thus, to decrease costs, which are wasted for bad dies. The developed system is also feasible for wafer-level characterisation of ISFETs in terms of sensitivity, hysteresis and response time. Additionally, the system might be also utilised for wafer-level testing of further electrochemical sensors.
KW - Biosensor
KW - Biosensorik
KW - ISFET
KW - Wafer
KW - ISFET
KW - wafer-level testing
KW - capillary micro-droplet cell
Y1 - 2006
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:hbz:a96-opus-1259
ER -
TY - GEN
A1 - Horsch, Andreas
T1 - Die Masken des Harlekin : Formensprache im Charakterdesign
T1 - The harlequin's masks : formal language in character design
N2 - Ziel und Inhalt dieser Arbeit ist das Design eines Harlekin-Charakters und die Darstellung seiner Ausdrucksskala. Der Schwerpunkt liegt dabei auf dem Studium der Gesichtsmuskeln, ihrer Formensprache und ihrer Relation zu den 6 Grundemotionen Traurigkeit, Ärger, Angst, Freude, Ekel und Überraschung (nach dem Modell von Paul Ekman). Alle 6 Emotionen sind in verschiedenen Intensitätsgraden und Variationen behandelt, wobei die Emotion der Freude aufgrund ihrer engen Bindung zum Harlekin-Charakter vergleichsweise umfassender bearbeitet wurde. Das Endergebnis stellt eine Bildreihe von ca. 50 Ausdrücken und eine Abhandlung über Gesichtsmuskulatur und -ausdruck, dessen Relation zu den Emotionen und den Hintergrund des Harlekincharakters dar. Die Illustrationen wurden unter Verwendung der 3D-Technologie von Maya 7.0 und ZBrush 2.0 ausgeführt.
N2 - The content and goal of this work is the design of a harlequin-character and the depiction of his range of expression. The focal point lies on the study of the facial muscles, their formal vocabulary and their relation to the 6 basic emotions sadness, anger, fear, joy, disgust and surprise (after Paul Ekman's model). All 6 emotions are treated in different intensities and variations, whereas the emotion of joy is handled in a more profound way because of its close relationship to the harlequin-character. The end result is a series of illustrations of approx. 50 expressions and a treatise on the topic of facial musculature and expression, their relationship to emotions and the background of the harlequin-character. The illustrations were realized using the 3D-technologies of Maya 7.0 and ZBrush 2.0.
KW - Harlekin
KW - Gesichtsmuskel
KW - Mimik
KW - Modellierung
KW - Gefühl
KW - 3D
KW - Charakter
KW - Drahtgittermodell
KW - Gesichtsmodellierung
KW - Gesichtsausdruck
KW - 3D
KW - character
KW - facial expression
KW - facial modeling
KW - wire frame model
Y1 - 2006
ER -
TY - JOUR
T1 - Fachblatt, Jahrgang 2005; Nr. 2
N2 - Institute 20 Jahre "Summer School Renewable Energy" Personen Prof. Dr.rer.nat. Dr.h.c. Gisela Engeln-Müllges geht in den Ruhestand Fachhochschul-Rektor Prof. Hermann-Josef Buchkremer geht in den Ruhestand Forschung "Badekultur in der Renaissance" Studenten an der Fachhochschule bauen Mini-Satellit Service Start von Cmpus, HIS QIS und neuem Webdesign "Join the best" - MLP bietet neue Chancen auf internationale Spitzenpraktika Forschungsergebnisse werden weltweit sichtbar Menschen an der FH Ein Bild entsteht zuerst im Kopf - die Diplom-Fotografin Jeanne Püttmann FH Aachen als Sprungbrett in luftige Höhen - Silke Lotties Auch mit 100 noch Flugbenzin im Blut! - Aachener Flugpionier Richard Perlia Zwischen Marathon und Studium - Angela Müller Einer der ersten Absolventen des Masterstudiengangs Facility Management - Mike Müller Aus den Fachbereichen Naturwissenschaften zum Anfassen: Lehrer zeigen hohe Motivation DIPLOMA 2005 - Derspringendepunkt Neue "Welten" erleben - Studierende beginnen ihren Auslandsaufenthalt Endlich der Sieg: Bauingenieure erfolgreich in der Wertung Bootskonstruktion Viele Fragen werden am Info-Tag Wirtschaftswissenschaften beantwortet Alumni Erster "Luft- und Raumfahrt" - Absolventenkongress Ein halbes Jahrhundert Bauingenieure Personalinfo Honorarprofessor Dr. Peter Lelkes Prof. Dr.-Ing. Günther Dahl Prof. Klaus Endrikat Prof. Dr.-Ing. Alexander Boeminghaus Prof. Dr. Narendra Bansal jetzt Rektor in Indien
T3 - Fachblatt / FH Aachen - 2005, 2
KW - Fachhochschule Aachen
KW - Fachhochschule Aachen
KW - Aachen University of Applied Sciences
Y1 - 2005
ER -
TY - GEN
A1 - Samm, Doris
T1 - Mathematisches Pendel (Simulation in Java)
N2 - Die Anwender können die Länge des Pendels und die Auslenkung einstellen. Es werden die Änderung der potentiellen und kinetischen Energie sowie des Auslenkwinkels als Funktion der Zeit dargestellt.
KW - Pendel
KW - Auslenkung
KW - Javasimulation
Y1 - 2003
ER -
TY - GEN
A1 - Samm, Doris
T1 - Vertikal schwingende Feder (Simulation in Java)
N2 - Die Anwender können die Federkonstante, die Amplitude und die Masse einstellen. Die Änderung der kinetischen und potentiellen Energie werden angezeigt und die Auslenkung als Funktion der Zeit dargestellt.
KW - Feder
KW - Amplitude
KW - Auslenkung
KW - Javasimulation
Y1 - 2003
ER -
TY - GEN
A1 - Samm, Doris
T1 - Horizontal schwingende Feder (Simulation in Java)
N2 - Die Anwender können die Federkonstante, die Amplitude und die Masse einstellen. Es werden die Änderung der kinetischen und potentiellen Energie angezeigt und die Auslenkung als Funktion der Zeit dargestellt.
KW - Feder
KW - Amplitude
KW - Auslenkung
KW - Javasimulation
Y1 - 2003
ER -
TY - GEN
A1 - Samm, Doris
A1 - Witte, Tim
T1 - Virtuelles Labor zur Verarbeitung elektronischer Signale
N2 - Oberfläche zur Simulation einfacher Praktikumsversuche mit dem NIM System. Programmiert mit Flash MX. Die Simulation verschafft virtuellen Einblick in ein Pulselektroniklabor.
KW - Impulstechnik
KW - Signalquelle
KW - Simulation
KW - Virtuelle Realität
KW - Pulselektroniklabor
Y1 - 2003
ER -
TY - GEN
A1 - Samm, Doris
A1 - Perteck, Patrik
T1 - Der Helium-Neon-Laser
N2 - In der Lerneinheit werden zunächst anschaulich die Eigenschaften verschiedener Lichtquellen sowie wichtige Begriffe erläutert. Anschließen wird das physikalische Prinzip des HeNe-Lasers erklärt. Die Lerneinheit endet mit der Beschreibung des technischen Aufbaus eines HeNe-Lasers.
KW - Helium-Neon-Laser
KW - Lichtquelle
KW - Lichtabsorption
KW - Lichtemission
KW - Resonator
KW - Simulation
KW - Virtuelle Realität
KW - Lichtbetrachtung
KW - Besetzungsinversion
KW - He-Ne Laser
KW - He-Ne Schema
Y1 - 2003
ER -
TY - GEN
A1 - Samm, Doris
A1 - Meurer, Marcel
T1 - Die elektrische Leitung und Supraleitung
N2 - Die Lerneinheit stellt in anschaulicher Weise die verschiedenen Modelle der elektrischen Leitung dar und führt über diese zur Erklärung der Supraleitung. Effekte und Anwendungen der Supraleitung werden in Animationen und Bildern vorgeführt. Ein umfangreiches Glossar erläutert wichtige Begriffe.
KW - Elektrische Leitung
KW - Supraleitung
KW - Elektronengas
KW - Bändermodell
KW - Festkörper
KW - Elektrische Leitung
KW - Supraleitung
Y1 - 2003
ER -
TY - BOOK
A1 - Merten, Sabine
T1 - Verbesserung der Ausbildung in der Mikrosystemtechnik - virtuelle Labore bereiten auf die Herstellung realer Drucksensoren vor (2 Fassungen: konvertiert und original
N2 - Die Ausbildung in Hochtechnologien wie beispielsweise der Mikrosystemtechnik ist oft durch einen hohen Grad an Komplexität charakterisiert. Damit verbunden sind hohe Kosten für die Errichtung und den Betrieb der speziellen Laborräume und ihre häufig geringe Verfügbarkeit für die Studierenden. Zukünftige Ingenieure sammeln während ihrer Ausbildung aus diesen Gründen nur in beschränktem Umfang praktische Erfahrungen. Die Industrie hingegen fordert Personal mit hoher fachlicher Kompetenz, also fundiertem theoretischen Wissen und umfangreichen praktischen Kenntnissen. Dieser Diskrepanz – qualifizierte Ingenieure auf der einen Seite und eine eher theoretisch ausgerichtete Ausbildung auf der anderen Seite – wird mit einem neuen Blended-Learning-Konzept für MST-Technologiepraktika begegnet. Lernende werden über ein virtuelles Labor, das einen echten Reinraum mit realen Anlagen simuliert, intensiv auf reale Laborpraktika vorbereitet. Dabei geht es im virtuellen Labor gleichermaßen um die Vermittlung von Theorie und Praxis. Nur trainierte Teilnehmer mit einer intensiven Vorbereitung sind in der Lage, relativ eigenständig ein echtes MST-Bauteil innerhalb des anschließenden einwöchigen Laborkurses zu fertigen. Die Wirksamkeit des Konzeptes und die Steigerung des Lernerfolges durch die kombinierten virtuellen und realen Laborkurse wurden im Rahmen der Dissertation begleitend untersucht. Die Ergebnisse flossen direkt in die Weiterentwicklung der Technologiepraktika ein. Die Konzepte und Erkenntnisse sind zudem sehr interessant für die Entwicklung von Blended-Learning-Angeboten in ähnlichen oder anderen Fachgebieten sowie für weitere Bildungseinrichtungen. (Die Dissertation liegt hier in 2 Fassungen vor: Die Originalfassung ist nur bei guter Rechnerausstattung und guter Netzanbindung nutzbar, die konvertierte Fassung ist unverändert, allerdings sind Qualitätseinbußen beim Ausdruck einiger Grafiken möglich)
N2 - Education in high technologies, like e.g. Microsystems technology, is usually characterized by a high degree of complexity. In addition it is usually connected with large economic efforts for invest, operation and maintenance of the special laboratory facilities. The access to such facilities for educational purposes is often quite limited. Therefore engineering students rather rarely gather practical experience in such technologies during their university studies. In contrast, industry has a large demand for engineers with high professional competence, i.e. profound theoretical knowledge combined with substantial practical experience. The newly developed blended learning concept for MST laboratory training tries to bridge the gap between the need for qualified engineers and the more theoretical university education. The learners prepare intensively for real hands-on clean room trainings with a virtual technology laboratory, i.e. a computer simulation of the clean room machines and the corresponding processes. In the virtual technology laboratory the students brush up their theoretical knowledge and at the same time learn to operate the complex clean room machines. Only well trained and intensively prepared students are capable to produce a fully functional MST component within a compact clean room laboratory course of only one week duration and an only modest amount of supervision. The effectivity of this concept and the increase of the learning success due to the specific mixture of virtual and real laboratory sessions has been accompanied and analysed by this dissertation. The results have been used to further improve the laboratory courses. Concepts and results are also very attractive for comparable blended learning proposals in other technical disciplines.
KW - Mikrosystemtechnik
KW - Virtuelles Laboratorium
KW - Lernprogramm
KW - Hochschule / Lehre / Evaluation
KW - Computersimulation
KW - Drucksensor
KW - Blended-Learning
KW - Reinraumpraktikum
KW - blended learning
KW - hands-on cleanroom training
Y1 - 2005
N1 - Zugl.: Saarbrücken, Univ., Diss., 2005
ER -
TY - JOUR
A1 - Baroud, Gamal
A1 - Wu, J.Z.
A1 - Bohner, M
A1 - Sponagel, Stefan
A1 - Steffen, T.
T1 - How to determine the permeability for cement infiltration into osteoporotic cancellous bone
JF - Medical Engineering & Physics. 25 (2003), H. 4
N2 - Cement augmentation is an emerging surgical procedure in which bone cement is used to infiltrate and reinforce osteoporotic vertebrae. Although this infiltration procedure has been widely applied, it is performed empirically and little is known about the flow characteristics of cement during the injection process. We present a theoretical and experimental approach to investigate the intertrabecular bone permeability during the infiltration procedure. The cement permeability was considered to be dependent on time, bone porosity, and cement viscosity in our analysis. In order to determine the time-dependent permeability, ten cancellous bone cores were harvested from osteoporotic vertebrae, infiltrated with acrylic cement at a constant flow rate, and the pressure drop across the cores during the infiltration was measured. The viscosity dependence of the permeability was determined based on published experimental data. The theoretical model for the permeability as a function of bone porosity and time was then fit to the testing data. Our findings suggest that the intertrabecular bone permeability depends strongly on time. For instance, the initial permeability (60.89 mm4/N.s) reduced to approximately 63% of its original value within 18 seconds. This study is the first to analyze cement flow through osteoporotic bone. The theoretical and experimental models provided in this paper are generic. Thus, they can be used to systematically study and optimize the infiltration process for clinical practice.
KW - Osteoporose
KW - Permeabilität
KW - Viskose Strömung
KW - Viskosität
KW - Vertebroplastie
KW - Cement infiltration
KW - Vertebroplasty
KW - Osteoporosis
KW - Permeability
KW - Experiment
KW - Analysis
KW - Viscous flow
Y1 - 2003
SN - 1350-4533
SP - 283
EP - 288
ER -
TY - JOUR
A1 - Kühn, Raoul-Roman
A1 - Haugner, Werner
A1 - Staat, Manfred
A1 - Sponagel, Stefan
T1 - A Two Phase Mixture Model based on Bone Observation
N2 - An optimization method is developed to describe the mechanical behaviour of the human cancellous bone. The method is based on a mixture theory. A careful observation of the behaviour of the bone material leads to the hypothesis that the bone density is controlled by the principal stress trajectories (Wolff’s law). The basic idea of the developed method is the coupling of a scalar value via an eigenvalue problem to the principal stress trajectories. On the one hand this theory will permit a prediction of the reaction of the biological bone structure after the implantation of a prosthesis, on the other hand it may be useful in engineering optimization problems. An analytical example shows its efficiency.
KW - Knochen
KW - Knochenbildung
KW - Knochenchirugie
KW - Strukturanalyse
KW - Schwammknochen
KW - Knochendichte
KW - Wolffsches Gesetz
KW - bone structure
KW - bone density
KW - Wolff's Law
KW - cancellous bone
Y1 - 2004
ER -
TY - JOUR
A1 - Vu, Duc-Khoi
A1 - Staat, Manfred
T1 - An algorithm for shakedown analysis of structure with temperature dependent yield stress
N2 - This work is an attempt to answer the question: How to use convex programming in shakedown analysis of structures made of materials with temperature-dependent properties. Based on recently established shakedown theorems and formulations, a dual relationship between upper and lower bounds of the shakedown limit load is found, an algorithmfor shakedown analysis is proposed. While the original problem is neither convex nor concave, the algorithm presented here has the advantage of employing convex programming tools.
KW - Einspielen
KW - Temperaturabhängigkeit
KW - Fließgrenze
KW - Shakedown
KW - shakedown analysis
KW - yield stress
Y1 - 2004
ER -
TY - JOUR
A1 - Staat, Manfred
T1 - Direct FEM Limit and Shakedown Analysis with Uncertain Data
N2 - The structural reliability with respect to plastic collapse or to inadaptation is formulated on the basis of the lower bound limit and shakedown theorems. A direct definition of the limit state function is achieved which permits the use of the highly effective first order reliability methods (FORM) is achieved. The theorems are implemented into a general purpose FEM program in a way capable of large-scale analysis. The limit state function and its gradient are obtained from a mathematical optimization problem. This direct approach reduces considerably the necessary knowledge of uncertain technological input data, the computing time, and the numerical error, leading to highly effective and precise reliability analyses.
KW - Finite-Elemente-Methode
KW - Einspielen
KW - FEM
KW - Einspielanalyse
KW - shakedown
KW - limit load
KW - reliability analysis
KW - FEM
KW - direct method
Y1 - 2000
ER -
TY - GEN
A1 - Bellenberg, Markus
T1 - Optimierung einer Roboter-Schweißzelle als Basis eines E-Learning Systems
T1 - Optimization of a Robot-welding Station as the Basis for an E-Learning System
N2 - Ziel war die technische Überarbeitung und Optimierung des vorliegenden Prototypen, um eine Basis für ein E-Learning System (Internet unterstütztes Lernen) zu schaffen. Zu diesem Zweck wurde das Programm der Robotersteuerung neu erstellt, notwendige mechanische Änderungen an Roboterequipment und Materialförderung vorgenommen sowie eine neue Internet-Anbindung geschaffen. Wesentliche Ergebnisse der Arbeit sind: • Erzeugen roboterbasierter kreisinterpolierter Bahnschweißnähte • Kommunikation des Lernsystems via Internet • Lernorientierte Steuerungssoftware
N2 - The main goal of this final thesis was the revision and optimization of the given prototype as a basis for an E-Learning environment. All components of the system, including specific technical aspects, are discussed in order to create the basis for future training documentation. Similarly, the programs for the robot motion sequences and welding processes were renewed in order to create well-structured, clear and properly documented software that is suitable for use in a formal training program.
KW - Roboter
KW - MAG-Schweißen
KW - MIG-Schweißen
KW - Schweißen
KW - Mechatronik
KW - Kawasaki
KW - E-Learning
KW - Roboter-Schweißen
KW - welding
KW - welded joint
KW - mechatronics
Y1 - 2002
ER -