Keding, Marcus

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Official Name
Keding, Marcus
Main Affiliation
Akademische Titel
DI
Email
marcus.keding@forschung-burgenland.at
Scopus Author ID
36468736300
Status
staff

Research Outputs

2013 2013 2012 2012 2011 2011 2010 2010 2009 2009 2008 2008 2007 2007 0.0 0.0 1.0 1.0 2.0 2.0 3.0 3.0 4.0 4.0 5.0 5.0
Now showing 1 - 10 of 20
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    Publication
    Micro-Propulsion and Power Developments at AIT
    (2009-01-12)
    Keding, Marcus 
    ;
    Tajmar, Martin 
    ;
    Scharlemann, Carsten 
    The increasing application of micro-satellites (from 10 kg up to 100 kg) as well as CubeSats for a rising number of various missions demands the development of miniaturized propulsion systems. The Austrian Institute of Technology is developing a number of micropropulsion technologies including both electric and chemical thrusters targeting high-performance at small scales. Our electric propulsion developments include FEEP thrusters with thrust ranges from μN to mN using highly-integrated clusters of indium Liquid-Metal-Ion Sources providing ultralow thrust noise and long-term stability, as well as the development of a micro PPT thruster enabling pointing capabilities for CubeSats. For chemical thrusters, we are developing novel micro-monopropellant thrusters with several hundred mN as well as a 1-3 N bi-propellant micro rocket engine using green propellants and high specific impulse performance. This paper will give an overview of our micropropulsion developments highlighting performance as well as possible applications.
      102  2
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    Publication
    Development of Innovative Micro Power Converter Technologies at the Austrian Institute of Technology
    (American Institute of Aeronautics and Astronautics, 2009-08)
    Keding, Marcus 
    ;
    Vasiljevich, Ivanhoe 
    ;
    Dudzinski, Piotr 
    ;
    Tajmar, Martin 
    ;
    Gerger, Joachim 
    Waste heat is a primary source of energy loss in many aerospace and terrestrial applications. The Austrian Institute of Technology (AIT) is presently developing two different types of micro power converters, promising high efficiencies in their respective application areas. The first converter is based on an innovative thermoacoustic Stirling engine concept without moving parts. Such a maintenance-free engine system would be particularly suitable for advanced Stirling radioisotope space power systems. The second converter is based on microturbines to use exhaust-gases for improving the overall efficiency for a number of applications. This paper will summarize our efforts on micro power converter technologies.
      104  1Scopus© Citations 1
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    Publication
    Innovative Hydrogen Storage Solutions for Aerospace Applications
    (Jülich GmbH, 2010)
    Keding, Marcus 
    ;
    Reissner, Alexander 
    ;
    Schmid, G. 
    ;
    Tajmar, M. 
      142  2376
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    Publication
    Neutron transmission measurements on hydrogen filled microspheres
    (Elsevier, 2013-10-26)
    Dyrnjaja, Eva 
    ;
    Hummel, Stefan 
    ;
    Keding, Marcus 
    ;
    Smolle, Marie-Theres 
    ;
    Gerger, Joachim 
    ;
    Zawiswky, Michael 
    Hollow microspheres are promising candidates for future hydrogen storage technologies. Although the physical process for hydrogen diffusion through glass is well understood, measurements of static quantities (e.q. hydrogen pressure inside the spheres) as well as dynamic properties (e.g. diffusion rate of hydrogen through glass) are still difficult to handle due to the small size of the spheres (d ! 15 lm). For diffusion rate measurements, the long-term stability of the experiment is also mandatory due to the relatively slow diffusion rate. In this work, we present an accurate and long-term stable measurement technique for static and dynamic properties, using neutron radiography. Furthermore, possible applications for hydrogen filled microspheres within the scope of radiation issues are discussed.
      65  1Scopus© Citations 2
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    Innovative Hydrogen Storage in Microspheres
    (2008-02-20)
    Keding, Marcus 
    ;
    Tajmar, Martin 
      107  1
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    Publication
    Development of a Ti-doped Sodium Alanate Hydrogen Storage System
    (2009)
    Keding, Marcus 
    ;
    Reissner, Alexander 
    ;
    Dudzinski, Piotr 
    ;
    Tajmar, Martin 
    A trade-off analysis regarding power supply on satellites, which was performed for the European Space Agency (ESA), suggested that fuel cells might be an interesting candidate to replace secondary batteries on satellites. The Austrian Research Centers (ARC) decided to approach this topic by combining a fuel cell with innovative chemical hydrogen and oxygen storage as well as integrating the oxygen storage system into a form that can be used as a structural element. Also an integration of the fuel cell into the hydrogen tank, and the resulting storage of dissipation heat, results in a reduction of the necessary thermal control system. These advantages are very interesting in order to obtain higher weight efficiencies, which are especially important for space and automotive applications. The complete system includes a hydrogen storage tank based on Ti-doped sodium alanate and a novel oxygen tank based on YBaCo4O7 developed at ARC. Water tanks and a micro-fluidic system connected to the fuel cell have been considered as well in order to provide a completely reversible system, competitive to batteries. For the hydrogen storage, a finite elements model has been developed, implementing the reaction kinetics of the storage process, in order to predict the thermal mechanisms during adsorption and desorption of hydrogen in sodium alanate. The present paper discusses these simulations, the development of an experimental hydrogen storage tank and the proposed concepts of a battery replacement system.
      98  1
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    Publication
    Improved µ-scale Turbine Expander for Energy Recovery
    (ASME, 2010-06-14)
    Keding, Marcus 
    ;
    Dudzinski, Piotr 
    ;
    Reissner, Alexander 
    ;
    Hummel, Stefan 
    ;
    Tajmar, Martin 
      138  818Scopus© Citations 3
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    Patent
      186  361