@article{56968, author = {{Biehler, Rolf and Peter-Koop, Andrea and Sträßer, Rudolf and Weigand, Hans-Georg}}, issn = {{0173-5322}}, journal = {{Journal für Mathematik-Didaktik}}, number = {{1}}, pages = {{1--3}}, publisher = {{Springer Science and Business Media LLC}}, title = {{{JMD ab 2010 bei Springer}}}, doi = {{10.1007/s13138-010-0002-2}}, volume = {{31}}, year = {{2010}}, } @inbook{56964, author = {{Biehler, Rolf and Fischer, Pascal R and Hochmuth, Reinhard and Jeuring, Johan and Wassong, Thomas}}, booktitle = {{Proceedings of the S-ICT conference, Universiteit Utrecht, 1.-2. Nov. 2010}}, title = {{{How to support students learning in mathematical bridging-courses using an ITS? Remedial scenarios in the European project Math-Bridge}}}, year = {{2010}}, } @book{57644, editor = {{Langer, Antje and Richter, Sophia and Barbara, Friebertshäuser}}, isbn = {{978-3-8340-0675-2}}, publisher = {{Schneider-Verlag Hohengehren}}, title = {{{(An)Passungen. Körperlichkeit und Beziehungen in der Schule – ethnographische Studien.}}}, year = {{2010}}, } @inbook{57790, author = {{Richter, Sophia and Langer, Antje}}, booktitle = {{(An)Passungen. Körperlichkeit und Beziehungen in der Schule – ethnographische Studien. }}, editor = {{Langer, Antje and Richter, Sophia and Friebertshäuser, Barbara}}, isbn = {{978-3-8340-0675-2}}, pages = {{209--234}}, publisher = {{Schneider-Verlag Hohengehren}}, title = {{{Verschlungene Wege. Vorgehen, Überraschungen und Widerstände in der ethnographischen Forschung.}}}, year = {{2010}}, } @article{63968, author = {{Gutmann, Torsten and Walaszek, Bernadeta and Xu, Yeping and Waechtler, Maria and Del Rosal, Iker and Gruenberg, Anna and Poteau, Romuald and Axet, Rosa and Lavigne, Guy and Chaudret, Bruno and Limbach, Hans-Heinrich and Buntkowsky, Gerd}}, journal = {{Journal of the American Chemical Society}}, number = {{33}}, pages = {{11759–11767}}, title = {{{Hydrido-Ruthenium Cluster Complexes as Models for Reactive Surface Hydrogen Species of Ruthenium Nanoparticles. Solid-State H-2 NMR and Quantum Chemical Calculations}}}, doi = {{10.1021/ja104229a}}, volume = {{132}}, year = {{2010}}, } @inbook{57786, author = {{Langer, Antje and Friebertshäuser, Barbara}}, booktitle = {{(An)Passungen. Körperlichkeit und Beziehungen in der Schule – ethnographische Studien. }}, editor = {{Langer, Antje and Richter, Sophia and Friebertshäuser, Barbara }}, isbn = {{978-3-8340-0675-2}}, pages = {{235--249}}, publisher = {{Schneider-Verlag Hohengehren}}, title = {{{Forschung und Lehre als „forschendes Lernen“. Plädoyer für studentische Forschungsprojekte.}}}, year = {{2010}}, } @inbook{57787, author = {{Langer, Antje and Richter, Sophia and Friebertshäuser, Barbara}}, booktitle = {{(An)Passungen. Körperlichkeit und Beziehungen in der Schule – ethnographische Studien.}}, editor = {{Langer, Antje and Richter, Sophia and Friebertshäuser, Barbara }}, isbn = {{978-3-8340-0675-2}}, pages = {{9--19}}, publisher = {{Schneider-Verlag Hohengehren}}, title = {{{Körperlichkeit und Beziehungen in der Schule – eine Einführung.}}}, year = {{2010}}, } @article{58593, abstract = {{AbstractThe transition metal complexes with the ligand 1,3‐bis(N,N,N′,N′‐tetramethylguanidino)propane (btmgp), [Mn(btmgp)Br2] (1), [Co(btmgp)Cl2] (2), [Ni(btmgp)I2] (3), [Zn(btmgp)Cl2] (4), [Zn(btmgp)(O2CCH3)2] (5), [Cd(btmgp)Cl2] (6), [Hg(btmgp)Cl2] (7) and [Ag2(btmgp)2][ClO4]2·2MeCN (8), were prepared and characterised for the first time. The stoichiometric reaction of the corresponding water‐free metal salts with the ligand btmgp in dry MeCN or THF resulted in the straightforward formation of the mononuclear complexes 1–7 and the binuclear complex 8. In complexes with MII the metal ion shows a distorted tetrahedral coordination whereas in 8, the coordination of the MI ion is almost linear. The coordination behavior of btmgp and resulting structural parameters of the corresponding complexes were discussed in an comparative approach together with already described complexes of btmgp and the bisguanidine ligand N1,N2‐bis(1,3‐dimethylimidazolidin‐2‐ylidene)‐ethane‐1,2‐diamine (DMEG2e), respectively.}}, author = {{Neuba, Adam and Herres‐Pawlis, Sonja and Seewald, Oliver and Börner, Janna and Heuwing, Andreas J. and Flörke, Ulrich and Henkel, Gerald}}, issn = {{0044-2313}}, journal = {{Zeitschrift für anorganische und allgemeine Chemie}}, number = {{15}}, pages = {{2641--2649}}, publisher = {{Wiley}}, title = {{{Systematische Studie zu den Koordinationseigenschaften des Guanidin‐Liganden Bis(tetramethylguanidino)propan mit den Metallen Mangan, Cobalt, Nickel, Zink, Cadmium, Quecksilber und Silber}}}, doi = {{10.1002/zaac.201000133}}, volume = {{636}}, year = {{2010}}, } @inproceedings{37039, abstract = {{Refinement of untimed TLM models into a timed HW/SW platform is a step by step design process which is a trade-off between timing accuracy of the used models and correct estimation of the final timing performance. The use of an RTOS on the target platform is mandatory in the case real-time properties must be guaranteed. Thus, the question is when the RTOS must be introduced in this step by step refinement process. This paper proposes a four-level RTOS-aware refinement methodology that, starting from an untimed TLM SystemC description of the whole system, progressively introduce HW/SW partitioning, timing, device driver and RTOS functionalities, till to obtain an accurate model of the final platform, where SW tasks run upon an RTOS hosted by QEMU and HW components are modeled by cycle accurate TLM descriptions. Each refinement level allows the designer to estimate more and more accurate timing properties, thus anticipating design decisions without being constrained to leave timing analysis to the final step of the refinement. The effectiveness of the methodology has been evaluated in the design of two complex platforms.}}, author = {{Becker, Markus and Di Guglielmo, Giuseppe and Fummi, Franco and Müller, Wolfgang and Pravadelli, Graziano and Xie, Tao}}, booktitle = {{Proceedings of DATE’10}}, keywords = {{Timing, Hardware, Operating systems, Process design, Accuracy, Standards development, Context modeling, Real time systems, Communication channels, Microprogramming}}, location = {{Dresden}}, publisher = {{IEEE}}, title = {{{RTOS-Aware Refinement for TLM2.0-based HW/SW Design}}}, doi = {{10.1109/DATE.2010.5456965}}, year = {{2010}}, } @article{60716, abstract = {{After reconstruction of the anterior cruciate ligament (ACL) afferent proprioceptive information from the knee joint may be altered. In order to examine changes in central activation patterns, spectral features of the electroencephalography (EEG) were measured. Patients after ACL reconstruction and healthy controls carried out an knee‐angle reproduction task in a groups × limbs × trials design. Cortical activity was recorded using international standards. FFT were conducted to determine power at Theta, Alpha‐1, Alpha‐2 and Beta‐1. Statistics show significantly larger aberrations in the reconstructed limbs compared with the controls whereas there are no differences between the uninvolved land controls. Brain activity demonstrates significantly higher frontal Theta‐power (F3, F4, F8) in both limbs of the ACL group vs the controls and a significantly higher Alpha‐2 power was shown in the ACL‐reconstructed limb compared with controls at parietal positions (P3, P4). No such differences were found between the uninvolved side and the controls. The EEG was able to measure a change in joint position sense at the cortical level after the reconstruction of the ACL. The results of these findings might indicate differences in focused attention with involvement of the anterior cingulate cortex (frontal Theta) and sensory processing in the parietal somatosensory cortex (Alpha‐2).}}, author = {{Baumeister, Jochen and Reinecke, Kirsten and Weiss, Michael}}, issn = {{0905-7188}}, journal = {{Scandinavian Journal of Medicine & Science in Sports}}, number = {{4}}, pages = {{473--484}}, publisher = {{Wiley}}, title = {{{Changed cortical activity after anterior cruciate ligament reconstruction in a joint position paradigm: an EEG study}}}, doi = {{10.1111/j.1600-0838.2007.00702.x}}, volume = {{18}}, year = {{2010}}, } @article{38008, author = {{Werner, Thomas and Koch, Juliane}}, issn = {{1434-193X}}, journal = {{European Journal of Organic Chemistry}}, keywords = {{T3}}, number = {{36}}, pages = {{6904--6907}}, publisher = {{Wiley}}, title = {{{Sodium Hydride Catalyzed Tishchenko Reaction}}}, doi = {{10.1002/ejoc.201001294}}, volume = {{2010}}, year = {{2010}}, } @article{13581, author = {{Wippermann, S. and Schmidt, Wolf Gero and Bechstedt, F. and Chandola, S. and Hinrichs, K. and Gensch, M. and Esser, N. and Fleischer, K. and McGilp, J. F.}}, issn = {{1862-6351}}, journal = {{physica status solidi (c)}}, number = {{2}}, pages = {{133--136}}, title = {{{Optical anisotropy of Si(111)-(4 × 1)/(8 × 2)-In nanowires calculated fromfirst-principles}}}, doi = {{10.1002/pssc.200982413}}, volume = {{7}}, year = {{2010}}, } @article{13843, author = {{Wippermann, S. and Schmidt, Wolf Gero and Thissen, P. and Grundmeier, Guido}}, issn = {{1862-6351}}, journal = {{physica status solidi (c)}}, number = {{2}}, pages = {{137--140}}, title = {{{Dissociative and molecular adsorption of water onα-Al2O3(0001)}}}, doi = {{10.1002/pssc.200982423}}, volume = {{7}}, year = {{2010}}, } @article{13831, author = {{Speiser, E. and Chandola, S. and Hinrichs, K. and Gensch, M. and Cobet, C. and Wippermann, S. and Schmidt, Wolf Gero and Bechstedt, F. and Richter, W. and Fleischer, K. and McGilp, J. F. and Esser, N.}}, issn = {{0370-1972}}, journal = {{physica status solidi (b)}}, number = {{8}}, pages = {{2033--2039}}, title = {{{Metal-insulator transition in Si(111)-(4 × 1)/(8 × 2)-In studied by optical spectroscopy}}}, doi = {{10.1002/pssb.200983961}}, volume = {{247}}, year = {{2010}}, } @article{13829, author = {{Krivosheeva, A.V. and Sanna, S. and Schmidt, Wolf Gero}}, issn = {{0927-0256}}, journal = {{Computational Materials Science}}, number = {{4}}, pages = {{895--898}}, title = {{{First-principles investigation of CO adsorption on Pt/Ge(001)-(4×2)}}}, doi = {{10.1016/j.commatsci.2010.06.043}}, volume = {{49}}, year = {{2010}}, } @article{4123, abstract = {{GaAs-based semiconductor microdisks with high quality whispering gallery modes (Q44000) have been fabricated.A layer of self-organized InAs quantumdots (QDs) served as a light source to feed the optical modes at room temperature. In order to achieve frequency tuning of the optical modes, the microdisk devices have been immersed in 4 – cyano – 4´-pentylbiphenyl (5CB), a liquid crystal(LC) with a nematic phase below the clearing temperature of TC≈34°C .We have studied the device performance in the temperature rangeof T=20-50°C, in order to investigate the influence of the nematic–isotropic phase transition on the optical modes. Moreover,we havea pplied an AC electric field to the device,which leads in the nematic phase to a reorientation of the anisotropic dielectric tensor of the liquid crystal.This electrical anisotropy can be used to achieve electrical tunability of the optical modes.Using the finite-difference time domain (FDTD) technique with an anisotropic material model, we are able to describe the influence of the liquid crystal qualitatively.}}, author = {{Piegdon, Karoline A. and Offer, Matthias and Lorke, Axel and Urbanski, Martin and Hoischen, Andreas and Kitzerow, Heinz-Siegfried and Declair, Stefan and Förstner, Jens and Meier, Torsten and Reuter, Dirk and Wieck, Andreas D. and Meier, Cedrik}}, issn = {{1386-9477}}, journal = {{Physica E: Low-dimensional Systems and Nanostructures}}, keywords = {{tet_topic_qd, tet_topic_microdisk}}, number = {{10}}, pages = {{2552--2555}}, publisher = {{Elsevier BV}}, title = {{{Self-assembled quantum dots in a liquid-crystal-tunable microdisk resonator}}}, doi = {{10.1016/j.physe.2009.12.051}}, volume = {{42}}, year = {{2010}}, } @inproceedings{4167, abstract = {{The electromagnetic field in the vicinity of sharp edges needs a special treatment in numeric calculation whenever accurate, fast converging results are necessary. One of the fundamental works concerning field singularities has been proposed in 1972 [1] and states that the electromagnetic energy density must be integrable over any finite domain, even if this domain contains singularities. It is shown, that the magnetic field H(, ϕ) and electric field E(, ϕ) are proportional to ∝ (t−1) for  → 0. The variable  is the distance to the edge and t has to fulfill the integrability condition and thus is restricted to 0 < t < 1. This result is often used to reduce the error corresponding to the singularity without increasing the numerical effort [2 - 5]. For this purpose, a correction factor K is estimated by inserting the proportionality into the wave equation. It is shown, that this method improves the accuracy of the result significantly, however the order of convergence is often not studied. In [4] a method to modify the material parameters in order to use analytic results to improve the numeric calculation is presented. In this contribution we will - inspired by the scheme given in [4] - develop a new method to estimate a correction factor for perfect conducting materials (PEC) and demonstrate the improvement of the results compared to the standard edge correction. Therefore analytic results (comparable to [1]) are consequently merged with the scheme in [4]. The main goal of this work is the calculation of the second harmonic generation (SHG) in the wave response of so-called metamaterials [6]. Frequently these structures contain sharp metallic edges with field singularities at the interfaces which have a strong impact on the SHG signals. Thus, an accurate simulation of singularities is highly important. However, the following approach can also be applied to many other setups, and one of them is shown in the example below.}}, author = {{Classen, C and Förstner, Jens and Meier, Torsten and Schuhmann, R}}, booktitle = {{2010 IEEE Antennas and Propagation Society International Symposium}}, isbn = {{9781424449675}}, keywords = {{tet_topic_numerics}}, location = {{Toronto, ON, Canada}}, publisher = {{IEEE}}, title = {{{Enhanced FDTD edge correction for nonlinear effects calculation}}}, doi = {{10.1109/aps.2010.5562017}}, year = {{2010}}, } @article{4172, abstract = {{Microdisks made from GaAs with embedded InAs quantum dots are immersed in the liquid crystal 4-cyano-4’-pentylbiphenyl (5CB). The quantum dots serve as emitters feeding the optical modes of the photonic cavity. By changing temperature, the liquid crystal undergoes a phase transition from the isotropic to the nematic state, which can be used as an effective tuning mechanism of the photonic modes of the cavity. In the nematic state, the uniaxial electrical anisotropy of the liquid crystal molecules can be exploited for orienting the material in an electric field, thus externally controlling the birefringence of the material. Using this effect, an electric field induced tuning of the modes is achieved. Numerical simulations using the finite-differences time-domain (FDTD) technique employing an anisotropic dielectric medium allow to understand the alignment of the liquid crystal molecules on the surface of the microdisk resonator.}}, author = {{Piegdon, Karoline A. and Declair, Stefan and Förstner, Jens and Meier, Torsten and Matthias, Heiner and Urbanski, Martin and Kitzerow, Heinz-Siegfried and Reuter, Dirk and Wieck, Andreas D. and Lorke, Axel and Meier, Cedrik}}, issn = {{1094-4087}}, journal = {{Optics Express}}, keywords = {{tet_topic_qd, tet_topic_microdisk}}, number = {{8}}, publisher = {{The Optical Society}}, title = {{{Tuning quantum-dot based photonic devices with liquid crystals}}}, doi = {{10.1364/oe.18.007946}}, volume = {{18}}, year = {{2010}}, } @article{26140, abstract = {{The viscous-flow sintering of different agglomerate particle morphologies is studied by three-dimensional computer simulations based on the concept of fractional volume of fluid. For a fundamental understanding of particle sintering characteristics, the neck growth kinetics in agglomerate chains and in doublets consisting of differently sized primary particles is investigated. Results show that different sintering contacts in agglomerates even during the first stages are not completely independent from each other, even though differences are small. The neck growth kinetics of differently sized primary particles is determined by the smaller one up to a size difference by a factor of approximately 2, whereas for larger size differences, the kinetics becomes faster. In particular, the agglomerate sintering kinetics is investigated for particle chains of different lengths and for different particle morphologies each having ten primary particles and nine initial sintering contacts. For agglomerate chains, the kinetics approximately can be normalized by using the radius of the fully coalesced sphere. In general, different agglomerate morphologies show equal kinetics during the first sintering stages, whereas during advanced stages, compact morphologies show significantly faster sintering progress than more open morphologies. Hence, the overall kinetics cannot be described by simply using constant morphology correction factors such as fractal dimension or mean coordination number which are used in common sintering models. However, for the first stages of viscous-flow agglomerate sintering, which are the most important for many particle processes, a sintering equation is presented. Although we use agglomerates consisting of spherical primary particles, our methodology can be applied to other aggregate geometries as well.}}, author = {{Kirchhof, M. J. and Schmid, Hans-Joachim and Peukert, W.}}, issn = {{1539-3755}}, journal = {{Physical Review E}}, number = {{2}}, pages = {{026319 }}, title = {{{Three-dimensional simulation of viscous-flow agglomerate sintering}}}, doi = {{10.1103/physreve.80.026319}}, volume = {{80}}, year = {{2009}}, } @inbook{23744, abstract = {{In a Stackelberg pricing game a leader aims to set prices on a subset of a given collection of items, such as to maximize her revenue from a follower purchasing a feasible subset of the items. We focus on the case of computationally bounded followers who cannot optimize exactly over the range of all feasible subsets, but apply some publicly known algorithm to determine the set of items to purchase. This corresponds to general multi-dimensional pricing assuming that consumers cannot optimize over the full domain of their valuation functions but still aim to act rationally to the best of their ability. We consider two versions of this novel type of Stackelberg pricing games. Assuming that items are weighted objects and the follower seeks to purchase a min-cost selection of objects of some minimum weight (the Min-Knapsack problem) and uses a simple greedy 2-approximate algorithm, we show how an extension of the known single-price algorithm can be used to derive a polynomial-time (2 + ε)-approximation algorithm for the leader’s revenue maximization problem based on so-called near-uniform price assignments. We also prove the problem to be strongly NP-hard. Considering the case that items are subsets of some ground set which the follower seeks to cover (the Set-Cover problem) via a standard primal-dual approach, we prove that near-uniform price assignments fail to yield a good approximation guarantee. However, in the special case of elements with frequency 2 (the Vertex-Cover problem) it turns out that exact revenue maximization can be done in polynomial-time. This stands in sharp contrast to the fact that revenue maximization becomes APX-hard already for elements with frequency 3.}}, author = {{Briest, Patrick and Hoefer, Martin and Gualà, Luciano and Ventre, Carmine}}, booktitle = {{Lecture Notes in Computer Science}}, issn = {{0302-9743}}, title = {{{On Stackelberg Pricing with Computationally Bounded Consumers}}}, doi = {{10.1007/978-3-642-10841-9_6}}, year = {{2009}}, }