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151 results on '"Palzer S"'

1. Stationary gas sensor networks for continuous leakage detection

Author

Universitat Politècnica de Catalunya. Doctorat en Enginyeria Biomèdica, Universitat Politècnica de Catalunya. Departament d'Enginyeria de Sistemes, Automàtica i Informàtica Industrial, Universitat Politècnica de Catalunya. TecSalut - Grup de Recerca en Tecnologies de la Salut, Marín López, Daniel, Fonollosa Magrinyà, Jordi, Palzer, S., Universitat Politècnica de Catalunya. Doctorat en Enginyeria Biomèdica, Universitat Politècnica de Catalunya. Departament d'Enginyeria de Sistemes, Automàtica i Informàtica Industrial, Universitat Politècnica de Catalunya. TecSalut - Grup de Recerca en Tecnologies de la Salut, Marín López, Daniel, Fonollosa Magrinyà, Jordi, and Palzer, S.

Abstract

Continuous monitoring of Biogas installations is a means to improve safety and detect failures occurring only under specific operational conditions. Stationary methane sensor networks are able to perform this task by providing temporarily and spatially resolved data on methane concentrations. Therefore, the reliability and precision of the concentration data of individual nodes is paramount. This contribution presents the setting up of such a wireless gas sensor network based on a miniaturized, photoacoustic methane detection approach via multi-unit calibration. The results highlight the importance and potential of reliable calibration methods as basis for gas flux measurements using stationary sensor nodes., Peer Reviewed, Postprint (published version)

Published
2024

12. Contributors

Author

Chen, J., primary, Chen, L., additional, Chung, C., additional, Emadzadeh, B., additional, Ercili-Cura, D., additional, Firoozmand, H., additional, Ghorani, B., additional, Guo, J., additional, Huppertz, T., additional, Draget, K.I., additional, Kadam, S.U., additional, Karayannakidis, P.D., additional, Kelly, A.L., additional, Dille, M.J., additional, Hattrem, M.N., additional, McClements, D.J., additional, O’Donnell, C.P., additional, Palzer, S., additional, Ritzoulis, C., additional, Robin, F., additional, Rosenthal, A., additional, Rousseau, D., additional, Tiwari, B.K., additional, and Yang, X.-Q., additional

Published
2015
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17. Photo-Induced Room-Temperature Gas Sensing with a-IGZO Based Thin-Film Transistors Fabricated on Flexible Plastic Foil

Author

Knobelspies, S., Bierer, B., Daus, A., Takabayashi, A., Salvatore, G. A., Cantarella, G., Perez, A. O., Wollenstein, J., Palzer, S., Troster, G., and Publica

Subjects
Flexible electronics, thin-film transistor, NO2, thin-film transistor, A-IGZO, Gas sensor, lcsh:Chemical technology, Settore ING-INF/01 - Elettronica, flexible electronics, Article, NO, flexible electronics, gas sensor, a-IGZO, 2, Thin-film transistor, lcsh:TP1-1185
Abstract

We present a gas sensitive thin-film transistor (TFT) based on an amorphous Indium–Gallium–Zinc–Oxide (a-IGZO) semiconductor as the sensing layer, which is fabricated on a free-standing flexible polyimide foil. The photo-induced sensor response to NO2 gas at room temperature and the cross-sensitivity to humidity are investigated. We combine the advantages of a transistor based sensor with flexible electronics technology to demonstrate the first flexible a-IGZO based gas sensitive TFT. Since flexible plastic substrates prohibit the use of high operating temperatures, the charge generation is promoted with the help of UV-light absorption, which ultimately triggers the reversible chemical reaction with the trace gas. Furthermore, the device fabrication process flow can be directly implemented in standard TFT technology, allowing for the parallel integration of the sensor and analog or logical circuits., Sensors, 18 (2), ISSN:1424-8220

Published
2018

19. Inkjet-printed, functional heterolayers of ZnO@CuO for stoma pouch monitoring

Author

Universitat Politècnica de Catalunya. Departament d'Enginyeria de Sistemes, Automàtica i Informàtica Industrial, Universitat Politècnica de Catalunya. B2SLab - Bioinformatics and Biomedical Signals Laboratory, Ortiz Perez, A., Gao, H., Lyu, Xuemeng, Wöllenstein, Jürgen, Kallfaß, V, Fonollosa Magrinyà, Jordi, Palzer, S., Universitat Politècnica de Catalunya. Departament d'Enginyeria de Sistemes, Automàtica i Informàtica Industrial, Universitat Politècnica de Catalunya. B2SLab - Bioinformatics and Biomedical Signals Laboratory, Ortiz Perez, A., Gao, H., Lyu, Xuemeng, Wöllenstein, Jürgen, Kallfaß, V, Fonollosa Magrinyà, Jordi, and Palzer, S.

Abstract

Many bowel cancer patients are in need of an artificial stoma as part of their surgical treatment, and associated post-surgical odours caused by leaking stoma pouches may lead to social isolation, which is why inconspicuous monitoring of this situation is important for affected persons. The integration of micro- and nanotechnology may offer low-cost, low-power consumption and small solutions to this challenge. To this end, we present an inkjet-printed, heterostructured gas sensor that has been built by incorporating nanosized p-type semiconducting CuO in a porous n-type ZnO matrix. The functional layer is fabricated using a combination of a colloidal suspension and sol–gel approach optimized for inkjet printing thus offering an industry-ready method for integration of nanomaterials in microelectromechanical systems (MEMS) structures. Using a thermal modulation scheme we enhance the information content and classify different events. We demonstrate that a simple MEMS device using a novel hetero-nanomaterial may be used to reliably identify situations where stoma pouch content escapes. © 2018, Springer-Verlag GmbH Germany, part of Springer Nature., Postprint (published version)

Published
2018

22. New method to selectively determine hydrogen sulfide concentrations using CuO layers

Author

Kneer, J., Knobelspies, S., Bierer, B., Wöllenstein, J., Palzer, S., and Publica

Abstract

Within this paper we demonstrate a new method to selectively determine the hydrogen sulfide (H2S) concentration using polycrystalline p-type semiconducting copper(II)oxide (CuO). Unlike commonly pursued approaches that use the resistivity of gas sensitive metal oxide layers to measure a trace gas concentration we show that the effects of a H2S induced percolation phase transition may be utilized to that end. Using a thermal modulation protocol the effects of the phase transition on the electrical behaviour of the layer may be reversed thus restoring the initial state of the layer. This forms the basis for a novel gas detection method using a semiconducting metal oxide layer. To highlight the capabilities in terms of selectivity the novel approach has been evaluated for several relevant oxidizing and reducing gases, including nitrogen dioxide (NO2), sulfur dioxide (SO2), ammonia (NH3) and H2S. The sensor response is determined at different operating temperatures and humidity levels. Due to the unique reaction towards H2S the new method enables a highly selective determination of the H2S concentration.

Published
2016

28. Entanglement dynamics under decoherence: from qubits to qudits

Author

Carvalho, A., Mintert, F., Palzer, S., and Buchleitner, A.

Subjects
Quantum Physics, FOS: Physical sciences, Quantum Physics (quant-ph), Time dependent processes
Abstract

We investigate the time evolution of entanglement for bipartite systems of arbitrary dimensions under the influence of decoherence. For qubits, we determine the precise entanglement decay rates under different system-environment couplings, including finite temperature effects. For qudits, we show how to obtain upper bounds for the decay rates and also present exact solutions for various classes of states., 8 pages, 2 figures

Published
2005

34. Entanglement dynamics under decoherence:from qubits to qudits

Author

Carvalho, Andre, Mintert, F, Palzer, S, Buchleitner, A, Carvalho, Andre, Mintert, F, Palzer, S, and Buchleitner, A

Abstract

We investigate the time evolution of entanglement for bipartite systems of arbitrary dimensions under the influence of decoherence. For qubits, we determine the precise entanglement decay rates under different system-environment couplings, including finite temperature effects. For qudits, we show how to obtain upper bounds for the decay rates and also present exact solutions for various classes of states.

Published
2006

47. Recovery of Homogeneous Materials from Composite Masonry Structures by Crushing and Mechanical Separation -- Limitations of Prevalent Processes.

Author

Landmann, M., Müller, A., Palzer, S., Leydolph, B., and Palzer, U.

Abstract

One means of bringing recycled construction materials back into the materials cycle is to reuse them as feedstock in production. To establish a closed-loop cycle in the masonry industry it is necessary to ensure a sufficient purity of crushed and sorted recycled material. Mixed rubble resulting from the demolition of masonry structures has to be processed mechanically by conventional crushing devices to obtain bulk materials with a defined particle size distribution. Particle size reduction is the most common means used to liberate homogeneous particles from composite masonry materials, without any attached plasters or mortars. Fully liberated particles of the main components (clay, calcium-silicate, lightweight concrete bricks, and autoclaved aerated concrete blocks) are a necessary prerequisite for the success of downstream sorting processes. Investigations of composite masonry materials have shown that the effectiveness of homogeneous particle liberation processes is practically independent of the type of stress exerted by the crushing devices. Rather, homogeneous particle liberation depends mainly on the particle size of the resulting bulk material. Particle sizes can be further reduced in order to achieve a greater purity at the expense of increasing waste in the form of fines which cannot be sorted. Therefore, the formation of composite particles cannot practically be avoided by prevalent crushing processes if coarser aggregates are required. Composite particles in recycling mixtures may cause problems for subsequent sorting processes. Downstream mechanical processes can be used to increase the degree of liberation and to remove attached plasters and mortars mechanically from the particles. It has been experimentally demonstrated that attached mortars, plasters, or other impurities with a lower mechanical comminution resistance could be separated selectively by friction or shearing. Based on these results, the first draft of a sophisticated processing system has been developed. [ABSTRACT FROM AUTHOR]

Published
2013

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