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Institution

Johannes Kepler University of Linz

EducationLinz, Oberösterreich, Austria
About: Johannes Kepler University of Linz is a education organization based out in Linz, Oberösterreich, Austria. It is known for research contribution in the topics: Thin film & Quantum dot. The organization has 6605 authors who have published 19243 publications receiving 385667 citations.


Papers
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Journal ArticleDOI
TL;DR: The criteria for high speed operation and the ability of this topology to fulfill them are discussed and a description of a prototype system, designed to reach speeds of beyond 100 000 r/min are given.
Abstract: With soaring raw material costs, the need for smaller drives running at higher speeds is ever increasing. In parallel, magnetic bearings and bearingless drives have outgrown the purely academic level and are the state of the art solution for several industrial processes. All the bearingless drives in industry and most of them in academic research run at relatively low speeds of up to 15 000 r/min. Thus, the suitability for high speed operation remained unclear. Along with a brief introduction to bearingless drives, the criteria for high speed operation and the ability of this topology to fulfill them is discussed in the first part. The second part gives a description of a prototype system, designed to reach speeds of beyond 100 000 r/min. The last section shows the experimental results of the prototype concerning the operational behavior.

85 citations

Proceedings ArticleDOI
07 Jul 2008
TL;DR: This paper presents an approach for managing the B2B relations in an near field communication (NFC) ecosystem offering services based on card emulation like loyalty, payment and ticketing and shows which services are needed in order to manage such an ecosystem and to provide convenience to the user.
Abstract: Whereas several NFC trials are already established around the world, currently there are no mass rolls out yet. This is due to several technical as well as administrative issues that have to be dealt with before rolling out such a system. In this paper we present an approach for managing the B2B relations in an near field communication (NFC) ecosystem offering services based on card emulation like loyalty, payment and ticketing. Out of experiences made from trials we show which services are needed in order to manage such an ecosystem and to provide convenience to the user. Further more we discuss functional aspects of such an ecosystem, the parties involved as well as their benefit for participating. Although the technology already given allows a smooth interaction for the consumer, the infrastructure behind the scene is complex and requires the cooperation on different levels to ensure interoperability and a thriving contactless scheme to be deployed.

85 citations

Journal ArticleDOI
TL;DR: In this paper, the photoinduced electron transfer in solid composite films of fullerenes embedded into conjugated polymers is shown to be reversible, ultrafast with a quantum efficiency approaching unity, and metastable.
Abstract: Recent developments in conjugated polymer-based photovoltaic elements have been reviewed. The photophysics of such photoactive devices is based on the photoinduced electron transfer from donor-type semiconducting conjugated polymers onto acceptor-type conjugated polymers or acceptor molecules such as Buckminsterfullerene, C60. Photoinduced electron transfer in solid composite films of fullerenes embedded into conjugated polymers is reversible, ultrafast (within 300 fs) with a quantum efficiency approaching unity, and metastable. Similar to the first step in natural photosynthesis, this photoinduced electron transfer leads to a number of potentially interesting applications, which include sensitization of the photoconductivity and photovoltaic phenomena. Furthermore, using the conjugated polymer donors in polymer blends with another conjugated polymer acceptor, similar photovoltaic elements have been realized. Examples of photovoltaic architectures are discussed with their potential in terrestrial solar energy conversion.

85 citations

Journal ArticleDOI
TL;DR: With these proton sources (“caged protons”), the spatial and temporal pH distribution can be controlled without diffusional mixing delays, and a new class of phototriggers for protons that facilitates the study of proton-dependent biological processes is introduced.
Abstract: Protons play a crucial role in cellular signal transduction. They trigger protein conformational transitions and are coupling intermediates in electron transport phosphorylation, and their transmembrane gradients may serve as energy sources or stores. Kinetic studies of all these processes may be aided by photoactivatable proton precursors for the generation of rapid pH jumps. With these proton sources (“caged protons”), the spatial and temporal pH distribution can be controlled without diffusional mixing delays. Most of the precursors are nitrobenzyl derivatives, namely 2-nitrobenzaldehydes, as well as 2-nitrobenzyl and/or 1-(2-nitrophenyl)ethyl acetates, phosphates, tosylates, and sulfates. Their application is limited by the low efficiency of the activation in the long-wavelength UV/Vis range and the generation of reactive o-nitrosocarbonyl photoproducts. Here we introduce (6,7-dimethoxycoumarin-4-yl)methyl (DMCM) diethyl phosphate (1), DMCM methanesulfonate (2), and sodium DMCM sulfate (3), as well as [7-(dimethylamino)coumarin-4-yl]methyl (DMACM) diethyl phosphate (4), DMACM methanesulfonate (5), and sodium DMACM sulfate (6) as a new class of phototriggers for protons that facilitates the study of proton-dependent biological processes (Scheme 1). Compound 1, for example, has already been used to study H migration along lipid bilayers. Photocleavage of 1–6 is efficient and clean. It yields H, the respective anion, and the strongly fluorescent 7 or 8 (Scheme 2). The esters themselves are only very weakly

85 citations

Journal ArticleDOI
TL;DR: In this article, the authors examine the effects of the trustor's responsibility attribution for a trust violation and the trustee's frequency of prior violations on the subsequent erosion of trust in the relationship.
Abstract: Purpose – The purpose of this paper is to examine the effects of the trustor's responsibility‐attributions for a trust violation and the trustee's frequency of prior violations on the subsequent erosion of trust in the relationship.Design/methodology/approach – Data were collected from 120 middle‐senior level managers using a two‐part scenario‐based experimental design to test the impact of attributions and frequency of violations. Respondents' levels of trust and distrust were measured pre‐ and post‐violation as well as forgiving and a range of demographic variables.Findings – Results showed that trust eroded (and distrust increased) more when trustors perceived the trustees as not wanting to fulfill the trust‐expectations than when they could not do so. Further, trustors were willing to tolerate a maximum of two violations before trust in the relationship eroded significantly. The results also showed that trustors who were relatively more forgiving were less likely to lose trust in the trustee after a v...

85 citations


Authors

Showing all 6718 results

NameH-indexPapersCitations
Wolfgang Wagner1562342123391
A. Paul Alivisatos146470101741
Klaus-Robert Müller12976479391
Christoph J. Brabec12089668188
Andreas Heinz108107845002
Niyazi Serdar Sariciftci9959154055
Lars Samuelson9685036931
Peter J. Oefner9034830729
Dmitri V. Talapin9030339572
Tomás Torres8862528223
Ramesh Raskar8667030675
Siegfried Bauer8442226759
Alexander Eychmüller8244423688
Friedrich Schneider8255427383
Maksym V. Kovalenko8136034805
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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
20242
202354
2022187
20211,404
20201,412
20191,365