@article{26275, author = {{Mahnken, Rolf}}, issn = {{0376-9429}}, journal = {{International Journal of Fracture}}, pages = {{269--283}}, title = {{{Material forces for crack analysis of functionally graded materials in adaptively refined FE-meshes}}}, doi = {{10.1007/s10704-008-9175-9}}, year = {{2008}}, } @article{39757, abstract = {{It is well known that robust and reliable photonic crystal structures can be manufactured with very high precision by electrochemical etching of silicon wafers, which results in two- and three-dimensional photonic crystals made of macroporous silicon. However, tuning of the photonic properties is necessary in order to apply these promising structures in integrated optical devices. For this purpose, different effects have been studied, such as the infiltration with addressable dielectric liquids (liquid crystals), the utilization of Kerr-like nonlinearities of the silicon, or free-charge carrier injection by means of linear (one-photon) and nonlinear (two-photon) absorptions. The present article provides a review, critical discussion, and perspectives about state-of-the-art tuning capabilities.}}, author = {{Kitzerow, Heinz-Siegfried and Matthias, Heinrich and Schweizer, Stefan L. and van Driel, Henry M. and Wehrspohn, Ralf B.}}, issn = {{1687-6393}}, journal = {{Advances in Optical Technologies}}, publisher = {{Hindawi}}, title = {{{Tuning of the Optical Properties in Photonic Crystals Made of Macroporous Silicon}}}, volume = {{2008}}, year = {{2008}}, } @inbook{28208, author = {{Ferber, Ferdinand and Gockel, Franz-Barthold and Hampel, Thorsten and Pawlak, Thorsten and Mahnken, Rolf}}, booktitle = {{Experimental Analysis of Nano and Engineering Materials and Structures}}, title = {{{Homogeneous Administration of Experiments in Material Science for Configuration, Monitoring and Analysis}}}, doi = {{10.1007/978-1-4020-6239-1_226}}, year = {{2008}}, } @article{26256, author = {{Mahnken, Rolf}}, issn = {{0029-5981}}, journal = {{International Journal for Numerical Methods in Engineering}}, pages = {{1753--1788}}, title = {{{Geometry update driven by material forces for simulation of brittle crack growth in functionally graded materials}}}, doi = {{10.1002/nme.2468}}, year = {{2008}}, } @article{14935, author = {{Sureth-Sloane, Caren and Maiterth, Ralf}}, issn = {{1863-6683}}, journal = {{Review of Managerial Science}}, number = {{2}}, pages = {{81--110}}, title = {{{The impact of minimum taxation by an imputable wealth tax on capital budgeting and business strategy of German companies}}}, doi = {{10.1007/s11846-008-0016-z}}, volume = {{2}}, year = {{2008}}, } @article{14933, author = {{Niemann, Rainer and Sureth-Sloane, Caren}}, issn = {{0344-9327}}, journal = {{Journal für Betriebswirtschaft}}, number = {{3}}, pages = {{121--140}}, title = {{{Steuern und Risikobereitschaft in Modellen irreversibler Investitionen}}}, doi = {{10.1007/s11301-008-0037-3}}, volume = {{58}}, year = {{2008}}, } @article{14927, author = {{Hundsdoerfer, Jochen and Kiesewetter, Dirk and Sureth-Sloane, Caren}}, issn = {{0044-2372}}, journal = {{Zeitschrift für Betriebswirtschaft}}, number = {{1}}, pages = {{61--139}}, title = {{{Forschungsergebnisse in der Betriebswirtschaftlichen Steuerlehre — eine Bestandsaufnahme}}}, doi = {{10.1007/s11573-008-0004-4}}, volume = {{78}}, year = {{2008}}, } @inproceedings{41474, author = {{Seifert, Andreas and Schaper, Niclas}}, booktitle = {{Tagung „Kompetenzdiagnose und Kompetenzentwicklung in der Lehrerbildung“ des CEVET und PLAZ}}, location = {{Paderborn}}, title = {{{Erste Ergebnisse zur Messung pädagogischer Kompetenz in der universitären Lehrerausbildung.}}}, year = {{2008}}, } @inproceedings{41473, author = {{Seifert, Andreas and Schaper, Niclas and Hilligus, Annegret Helen and Grafe, Silke}}, booktitle = {{AEPF-Tagung „Kompetenz – Modellierung – Diagnostik – Entwicklung – Förderung“}}, location = {{Kiel}}, title = {{{Messung erziehungswissenschaftlicher Kompetenz in der Lehrerausbildung.}}}, year = {{2008}}, } @article{25980, abstract = {{Mesoporous SBA-15 (space group p6mm), KIT-6 (Ia3d) and KIT-5 (Fm3m) silicas, exhibiting different 2-D and 3-D channel- or cage-like pore structure and pore dimensions have been used as supports for iron oxide nanoparticles. The iron modification of the silica was performed according to a frequently used impregnation technique from aqueous iron nitrate solution. The materials were characterized by nitrogen physisorption, X-ray diffraction, TEM–EDX, Moessbauer spectroscopy, and temperature-programmed reduction (TPR) and tested in the catalytic decomposition of methanol. It is established that the location and dispersion of iron oxide nanoparticles are affected by the pore topology of the support. The most homogeneously dispersed iron oxide nanoparticles are observed using silica host matrix exhibiting a 3-D channel-like structure and pore diameters about 7 nm, and the thus-obtained composites exhibit high catalytic activity and selectivity in methanol decomposition to CO and hydrogen. For all the samples, characterized with a low mesopore volume and small pore diameters/pore entrances, the formation of larger iron oxide particles, mainly located on the outer surface, is observed. Inhomogeneously dispersed iron oxide particles with a large fraction of isolated, strongly interacting with the support, iron species, and possessing low catalytic activity and usually high selectivity to methane, are found for the silicas with relatively larger pores/pore entrances.}}, author = {{Tsoncheva, Tanya and Rosenholm, Jessica and Linden, Mika and Kleitz, Freddy and Tiemann, Michael and Ivanova, Ljubomira and Dimitrov, Momtchil and Paneva, Daniela and Mitov, Ivan and Minchev, Christo}}, issn = {{1387-1811}}, journal = {{Microporous and Mesoporous Materials}}, pages = {{327--337}}, title = {{{Critical evaluation of the state of iron oxide nanoparticles on different mesoporous silicas prepared by an impregnation method}}}, doi = {{10.1016/j.micromeso.2007.10.005}}, year = {{2008}}, } @article{25979, abstract = {{Various measures to optimise the impregnation of mesoporous CMK-3 carbon and SBA-15 silica matrices with metal nitrates for the synthesis of mesoporous metal oxides by structure replication are investigated. The effect of surface modification of the matrix pores, the choice of a solvent with suitable polarity, and the concentration of the metal nitrate solution are studied in detail. The efficiency of pore loading is monitored by nitrogen physisorption measurements. The creation of polar functions at the pore surface of CMK-3 carbon is shown to increase the impregnation efficiency substantially while maximizing the pore wall polarity of SBA-15 silica by increasing the amount of free silanol groups does not have any significant impact. The choice of a less polar solvent (THF instead of water) has a positive effect on the wettability of CMK-3 carbon in the first impregnation cycle but turns out to be disadvantageous in the second cycle; a similar trend is observed for variation of the metal salt concentration.}}, author = {{Roggenbuck, Jan and Waitz, Thomas and Tiemann, Michael}}, issn = {{1387-1811}}, journal = {{Microporous and Mesoporous Materials}}, pages = {{575--582}}, title = {{{Synthesis of mesoporous metal oxides by structure replication: Strategies of impregnating porous matrices with metal salts}}}, doi = {{10.1016/j.micromeso.2007.12.018}}, year = {{2008}}, } @article{25982, abstract = {{Iron (III) containing nanoparticles with superparamagnetic behaviour are prepared via deposition on various mesoporous supports (MgO, CeO2 and SBA-15). XRD, TEM-EDX, N2 physisorption, FTIR, and Moessbauer spectroscopy are used for their characterization. The reductive properties and catalytic behaviour in methanol decomposition of the materials are also studied. Depending on the chemical nature of the support, the predominant formation of: isolated iron species, strongly interacting with the support (for SBA-15), mixture of hematite and binary MgFe2O4 nanoparticles (for MgO) or almost homogeneously dispersed hematite particles (for CeO2) are observed. The state of iron species strongly affects their catalytic properties. The favorable effect of the support mesoporosity on the catalytic activity is most pronounced for the iron modified CeO2.}}, author = {{Tsoncheva, Tanya and Roggenbuck, Jan and Tiemann, Michael and Ivanova, Lyubomira and Paneva, Daniela and Mitov, Ivan and Minchev, Christo}}, issn = {{1387-1811}}, journal = {{Microporous and Mesoporous Materials}}, pages = {{339--346}}, title = {{{Iron oxide nanoparticles supported on mesoporous MgO and CeO2: A comparative physicochemical and catalytic study}}}, doi = {{10.1016/j.micromeso.2007.06.021}}, year = {{2008}}, } @inbook{25983, abstract = {{Nanoporous semiconducting metal oxide materials (In2O3, WO3) with uniform pore systems, large specific surface areas (80 m2 g−1), and pore-wall crystallinity were prepared by structure replication, using KIT-6 silica as a template. The products show improved properties as gas sensors (for methane or butanone) as compared to non-porous samples. In addition, porous WO3 samples with comparable porosity (prepared by conventional ‘soft templating’, using pluronic P123), which are amorphous on the atomic length scale show poorer gas sensitivity, indicating that crystallinity is a crucial factor in the sensing process.}}, author = {{Waitz, Thomas and Wagner, Thorsten and Kohl, Claus-Dieter and Tiemann, Michael}}, booktitle = {{Zeolites and related materials: Trends, targets and challenges, Proceedings of the 4th International FEZA Conference}}, issn = {{0167-2991}}, title = {{{New mesoporous metal oxides as gas sensors}}}, doi = {{10.1016/s0167-2991(08)80227-3}}, year = {{2008}}, } @article{25981, abstract = {{The growth of ZnS nanoparticles during precipitation from aqueous solution is studied by in situ stopped-flow UV absorption spectroscopy at temperatures between 283 and 323 K. Particle growth is marked by substantial ripening during the first 60 ms. Kinetic data suggest that a ripening mechanism by coalescence (oriented attachment) is predominant over Ostwald ripening, although the latter seems to coexist to a significant degree at early temporal stages, predominantly at low temperatures.}}, author = {{Tiemann, Michael and Marlow, Frank and Hartikainen, Juha and Weiss, Özlem and Lindén, Mika}}, issn = {{1932-7447}}, journal = {{The Journal of Physical Chemistry C}}, pages = {{1463--1467}}, title = {{{Ripening Effects in ZnS Nanoparticle Growth}}}, doi = {{10.1021/jp077729f}}, year = {{2008}}, } @article{25978, abstract = {{In recent years, a lot of research activity has focused on the synthesis of new ordered porous materials by utilization of porous matrices as templates. Since the matrices are themselves created by templating procedures, the entire process can be envisaged as “repeated templating”. This review describes recent conceptual developments in the field of structure replication and summarizes the large number of publications on new functional materials prepared by this method.}}, author = {{Tiemann, Michael}}, issn = {{0897-4756}}, journal = {{Chemistry of Materials}}, pages = {{961--971}}, title = {{{Repeated Templating}}}, doi = {{10.1021/cm702050s}}, year = {{2008}}, } @inbook{25984, abstract = {{Mesoporous ceria was synthesized by using both CMK-3 carbon and SBA-15 silica as structure matrices. All products exhibit uniform mesopores with diameters of 5-6 nm in a two-dimensional periodic arrangement in addition to varying amounts of interparticle porosity. The gas sensing properties (methane detection) of ordered mesoporous ceria was compared to a non-porous sample.}}, author = {{ROGGENBUCK, JAN and Tiemann, Michael}}, booktitle = {{Nanoporous Materials}}, title = {{{Mesoporous Ceria by Structure Replication from Various Porous Matrices}}}, doi = {{10.1142/9789812779168_0019}}, year = {{2008}}, } @article{45431, author = {{Mahnken, Rolf}}, issn = {{0178-7675}}, journal = {{Computational Mechanics}}, keywords = {{Applied Mathematics, Computational Mathematics, Computational Theory and Mathematics, Mechanical Engineering, Ocean Engineering, Computational Mechanics}}, number = {{5}}, pages = {{408--425}}, publisher = {{Springer Science and Business Media LLC}}, title = {{{A Newton-Multigrid algrithm for elasto-plastic/viscoplastic problems}}}, doi = {{10.1007/bf00350355}}, volume = {{15}}, year = {{2008}}, } @inproceedings{2370, author = {{Woehrle, Matthias and Plessl, Christian and Lim, Roman and Beutel, Jan and Thiele, Lothar}}, booktitle = {{IEEE Int. Conf. on Sensor Networks, Ubiquitous, and Trustworthy Computing (SUTC)}}, isbn = {{978-0-7695-3158-8}}, keywords = {{WSN, testing, verification}}, pages = {{201--208}}, publisher = {{IEEE Computer Society}}, title = {{{EvAnT: Analysis and Checking of event traces for Wireless Sensor Networks}}}, doi = {{10.1109/SUTC.2008.24}}, year = {{2008}}, } @inproceedings{2364, author = {{Schumacher, Tobias and Meiche, Robert and Kaufmann, Paul and Lübbers, Enno and Plessl, Christian and Platzner, Marco}}, booktitle = {{Proc. Int. Conf. on Engineering of Reconfigurable Systems and Algorithms (ERSA)}}, isbn = {{1-60132-064-7}}, pages = {{245--251}}, publisher = {{CSREA Press}}, title = {{{A Hardware Accelerator for k-th Nearest Neighbor Thinning}}}, year = {{2008}}, } @inproceedings{2372, author = {{Schumacher, Tobias and Plessl, Christian and Platzner, Marco}}, booktitle = {{Many-core and Reconfigurable Supercomputing Conference (MRSC)}}, keywords = {{IMORC, IP core, interconnect}}, title = {{{IMORC: An infrastructure for performance monitoring and optimization of reconfigurable computers}}}, year = {{2008}}, }