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Membrane electrode assemblies (MEA) developed at the Westphalian Energy Institute for polymer electrolyte membrane fuel cells (PEMFC) are high tech systems containing various materials structured in nanoscale, at which electrochemical reactions occur on catalyst nano particle surfaces. For low reactance homogeneous compression of the MEA’s layers is necessary. A novel stack architecture for electrochemical cells, especially PEMFC as well as PEM electrolysers, has been developed according to achieve ideal cell operation conditions. Single cells of such a stack are inserted into flexible slots that are surrounded by hydraulic media. While operation the hydraulic media is pressurised which leads to an even compression and cooling of the stack’s cells. With this stack design it has been possible to construct a test facility for simultaneous characterisation of several MEA samples. As compression and temperature conditions of every single sample are equal, with the novel test system the effect of e.g. different electrode configurations can be investigated. Furthermore, the modular stack design leads to the development of hybrid energy applications combining fuel cells, electrolysers, batteries as well as metal hydride tanks in one system.
Crowdfunding im Journalismus
(2014)
Diversity nachhaltig erfolgreich zu gestalten ist das Ziel zahlreicher AkteurInnen in Unternehmen, Bildungseinrichtungen und der Politik. Doch gerade die Vielfalt der Ansätze bringt oft Verwirrung.
ExpertInnen aus Wissenschaft und Praxis bieten in diesem Buch innovative Antworten auf das Verhältnis zwischen Corporate Social Responsibility und Diversity, einem Feld dessen Potentiale bisher noch wenig genutzt wurden. Praktische Erfahrungen aus Unternehmen, Hochschulen, Verbänden und der Beratung ergänzen theoretische Konzepte und zeigen erfolgreiche Umsetzungskonzepte auf, mit denen Synergien genutzt werden konnten. Dieser Band zeigt, wie CSR und Diversity zu nachhaltigem Erfolg führen kann und eröffnet eine neue Diskussion in Wissenschaft und Praxis.
The membrane electrode assemblies (MEA) for polymer electrolyte membrane fuel cells (PEMFC) developed at the Westphalian Energy Institute are based on oxygen plasma activated carbon nanotubes (CNT) doped with platinum particles. For electrode preparation an ink is used containing the activated CNTs as well as hydrophobic and hydrophilic material in solved form. After this ink is sprayed onto a graphitic substrate platinum particles are deposited by pulse plating method, where the plasma activation enhances CNT dispersibility as well as platinum deposition. This materials mixture is structured in nanoscale with the aim to increase the catalyst particles’ specific surface. For low reactance at operation, homogeneous compression of the MEA’s layers is necessary within a PEMFC. A novel stack architecture for electrochemical cells, especially PEMFC as well as PEM electrolysers, has been developed in order to achieve ideal cell operation conditions. Single cells of such a stack are inserted into flexible slots that are surrounded by a hydraulic medium which is pressurised during operation in order to achieve an even compression and cooling of the stack’s cells. With this stack design it has been possible to construct a test facility for simultaneous characterisation of several MEA samples. As compression and temperature conditions of every single sample are the same, the effects of e.g. different electrode configurations can be investigated with the novel test system.
Die Lüge vom schwachen Staat
(2014)
Die Branche der Gesundheitsdienstleistungen ist in einem fühlbaren und stetigen Wandel. Die Gründe sind vielfältig: Der soziodemografische Wandel, ein verändertes Gesundheitsbewusstsein und -verhalten und wirtschaftspolitische Einflüsse wie die Privatisierungen der letzten Jahren in diesem Bereich werden immer wieder benannt. Besonders betroffen sind die sogenannten „pflegenden Dienstleistungen“
Die Beiträge des vorliegenden Bandes beschäftigen sich mit Humandienstleistungen in Krankenhäusern und Pflegeeinrichtungen, daneben mit Sach- und Industriedienstleistungen. Durch diese Ergänzung werden Gemeinsamkeiten und Unterschiede zwischen beiden Bereichen verdeutlicht. Die Beiträge sind vornehmlich empirisch geprägt. Sie präsentieren die Ergebnisse diverser Untersuchungen in Krankenhäusern, Pflegeeinrichtungen und Unternehmen, wobei der praktische Ansatz von der Fallstudie über strukturierte Befragungen von Pflegepersonal bis hin zur Prozessbeobachtung reicht. Sie werden ergänzt um Erfahrungsberichte hinsichtlich der Einführung und Nutzung einzelner Managementinstrumente in der beruflichen Praxis.
E-Mail und die Detektive
(2014)
We argue that effective leadership development should be evidence-based, i.e. that it combines the best available scientific evidence with
research in the specific organizational context. To illustrate our proposition, we report findings from a case study in a multinational organization. The goal was to examine which rater source in the company’s 360 degree feedback would provide the most valid information about leadership competencies. Therefore, we explored relationships between 360 degree ratings and assessment center (AC) ratings of the same leadership competencies (N=151). It was predicted that AC ratings show higher overlap with 360 degree ratings for behaviors that specific rating
sources can more easily observe in the ratees’ work life. Results showed that peers were the most accurate observers of leadership competencies in 360 degree assessments, compared to managers and subordinates. This corroborates our argument for an evidence-based instead of an
intuitive handling of 360 degree feedback results. Practical implications and avenues for future research are discussed.
Exkurs: Personalmarketing im Internet - Die rechtlichen Herausforderungen an das Online-Recruiting
(2014)
We investigate how professional recruiters perceive and assess potential board director candidates. Based on a human capital perspective, individual characteristics will represent certain human capital resources, perceived as more or less useful for the firm. We focus on what characteristics are critical for a candidate to be perceived as appointable to a board. We are particularly interested in the role visible vs. more hidden aspects of human capital in these assessments. The aim of the study is to uncover central actors’ ideas and assumptions of what constitutes the ideal board director. This will add
knowledge as to how board compositions are created and
changed.
We conducted eight semi-structured, in-depth interviews with professional recruiters in Germany and Norway. The results show that formal competence is partly downplayed as selection criteria for board positions, while experience has a central role. Further, our results show that experiences have both a concrete and a symbolic side, where certain individual characteristics appear to represent an image of a successful director of a board. Further, our data show that symbolic capital, labeled “habitus”, is a crucial prerequisite for an individual to be appraised as an ideal candidate. The results indicate preferences for stability and predictability in recruitment processes, which may contribute to explain the persistently low
proportion of women on corporate boards.
The adsorption and reaction of the amino acid glycine (NH2-CH2-COOH) are studied experimentally on the polar single crystal surface of zinc oxide, ZnO(000-1), by X-ray photoelectron spectroscopy (XPS) under UV light in presence and absence of molecular O2. Deposition at 350 K mainly resulted in a largely deprotonatedmonolayer (NH2-CH2-COO−(a)+OH(s); where O is surface oxygen,(a)is for adsorbed and(s)is for surface species) identified by its XPS C1s binding energy at 289.3 eV (-COO), 286.7 eV (-CH2-) and XPS O1s at 531.8 eV(-COO). A decrease in the signals of all functional groups of the adsorbed glycine (monitored by their C1s, O1s,and N1s lines) is seen upon UV excitation in the absence and presence of O2pressures up to 5 × 10−6 mbar. The photoreaction cross sections extracted from the decrease in the C1s peaks were found to be =2.6 × 10−18(COO(a)) and 1.4 × 10−18(-CH2-)cm^2. The photoactivity of the ZnO(000-1) surface under UHV-conditions is found to be comparable to that seen in direct photolysis of amino acids in solution.
To achieve high temperature stable insulation materials for the electrical insulation of fine copper wires two different bis(alkoxysilylalkyl)pyromellitamide acids 1 and 2 were prepared. These organic–inorganic sol–gel hybrid precursors were obtained via reactions of pyromellitic dianhydride and alkoxysilylalkylamines. The molecular single-source precursors 1 and 2 were comprehensively studied using FT-IR, 1H, 13C and 29Si NMR spectroscopy as well as elemental analyses. Besides, the hydrolysis and condensation processes of the different precursors were examined with solution 29Si NMR spectroscopy. The imidization process was investigated using 13C NMR spectroscopy, FT-IR spectroscopy as well as thermal analysis methods. The different precursors were applied to coat fine copper wires using an industrial coating device. The obtained coatings were cured at temperatures between 380 and 425 °C, and tested regarding thicknesses, number of pinholes, electrical breakdown voltage and elongation. FT-IR spectroscopy was used to determine the chemical structure and scanning electron microscopy to investigate the morphology of the coating materials. The obtained coatings showed very promising mechanical, thermal and electrical properties, i.e. highest breakdown voltage values well above 200 V/µm. They possess high flexibility without cracking and no pinholes or other defects were detected.
Innovation und Gesundheit
(2014)
Innovationen kontrollieren
(2014)