@article{38237, author = {{El-Darawy, Mohamed and Pfau, Timo and Hoffmann, Sebastian and Peveling, Ralf and Wordehoff, Christian and Koch, Benjamin and Porrmann, Mario and Adamczyk, Olaf and Noé, Reinhold}}, journal = {{IEEE Photonics Technology Letters}}, number = {{21}}, pages = {{1796--1798}}, title = {{{Fast Adaptive Polarization and PDL Tracking in a Real-Time FPGA-Based Coherent PolDM-QPSK Receiver}}}, doi = {{10.1109/LPT.2008.2004685}}, volume = {{20}}, year = {{2008}}, } @article{38224, author = {{Hoffmann, Sebastian and Bhandare, Suhas and Pfau, Timo and Adamczyk, Olaf and Wordehoff, Christian and Peveling, Ralf and Porrmann, Mario and Noé, Reinhold}}, journal = {{IEEE Photonics Technology Letters}}, number = {{18}}, pages = {{1569--1571}}, title = {{{Frequency and Phase Estimation for Coherent QPSK Transmission With Unlocked DFB Lasers}}}, doi = {{10.1109/LPT.2008.928846}}, volume = {{20}}, year = {{2008}}, } @article{38225, author = {{Koch, Benjamin and Hidayat, Ariya and Zhang, Hongbin and Mirvoda, Vitali and Lichtinger, Manfred and Sandel, David and Noé, Reinhold}}, journal = {{IEEE Photonics Technology Letters}}, number = {{12}}, pages = {{961--963}}, title = {{{Optical Endless Polarization Stabilization at 9 krad/s With FPGA-Based Controller}}}, doi = {{10.1109/LPT.2008.922910}}, volume = {{20}}, year = {{2008}}, } @inproceedings{38328, author = {{Koch, B. and Hidayat, A. and Zhang, H. and Mirvoda, V. and Lichtinger, M. and Sandel, D. and Noé, Reinhold}}, booktitle = {{2008 DIGEST OF THE LEOS SUMMER TOPICAL MEETINGS}}, isbn = {{978-1-4244-1925-8}}, issn = {{1099-4742}}, pages = {{229--230}}, title = {{{12 krad/s Endless Polarization Stabilization with Lithium Niobate Component}}}, doi = {{10.1109/LEOSST.2008.4590573}}, year = {{2008}}, } @misc{37857, author = {{Grotjahn, Rebecca}}, booktitle = {{Die Musik in Geschichte und Gegenwart. Supplementband}}, editor = {{Finscher, Ludwig}}, publisher = {{Bärenreiter/Metzler}}, title = {{{Nilsson, Christina}}}, year = {{2008}}, } @inbook{36566, abstract = {{Die Bielefelder Arbeitsgruppe 8 Sozialarbeit/Sozialpädagogik hat in den letzten vier Dekaden deutliche Markierungen in der deutschsprachigen wie der internationalen Debatte um Soziale Arbeit gesetzt. Antriebsmotor dieser Entwicklung war und ist Hans-Uwe Otto. In diesem Band haben sich dessen Ko-Autorinnen und -Autoren aus Anlass seiner Pensionierung erstmals zu einer Gesamtschau dieser 'Bielefelder Forschungsperspektiven' auf die Soziale Arbeit versammelt. Die acht zentralen Forschungs- und Themenfelder, die von der Bielefelder AG oder unter ihrer Beteiligung in den letzten Jahrzehnten bestellt wurden, gliedern den Band. Der gemeinsame Bezugspunkt aller hier versammelten Beiträge ist die Verbindung von Sozialer Arbeit und Gesellschaft: Soziale Arbeit als professionelle Instanz ist nur in ihrem gesellschaftlichen Kontext und damit in explizit gesellschaftspolitischer Positionierung realisierbar.}}, author = {{Klingler, Birte and Landhäußer, Sandra and Ziegler, Holger}}, booktitle = {{Soziale Arbeit in Gesellschaft}}, isbn = {{978-3-531-15655-2}}, keywords = {{Sozialraum, Soziale Arbeit}}, pages = {{207--216}}, publisher = {{VS Verlag für Sozialwissenschaften Springer}}, title = {{{Die AdressatInnen sozialräumlich orientierter Sozialer Arbeit und der Sozialraum als Adressat – eine empirische Betrachtung}}}, year = {{2008}}, } @article{36856, author = {{Göddertz, Nina and van Treeck, Timo and Wieg, Mirco }}, journal = {{Online Tutoring Journal, Ausgabe 2 (9)}}, keywords = {{ILIAS, Jugendforschung}}, title = {{{Zwischen (trügerischer) Ruhe und fieberhafter Arbeit – Betreuung von Blended-Learning-Seminaren}}}, 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}}, } @inproceedings{38487, author = {{Nazarathy, Moshe and Noé, Reinhold and Weidenfeld, Rakefet and Khurgin, Jacob and Meiman, Yehouda and Cho, Pak and Shpantzer, Isaac}}, booktitle = {{2008 IEEE PHOTONICSGLOBAL@SINGAPORE (IPGC), VOLS 1 AND 2}}, isbn = {{978-1-4244-3901-0}}, pages = {{431+}}, title = {{{Recent Advances in Coherent Optical OFDM High-Speed Transmission}}}, year = {{2008}}, } @article{38479, author = {{Hidayat, A. and Koch, B. and Mirvoda, V. and Zhang, H. and Lichtinger, A. and Sandel, D. and Noé, Reinhold}}, issn = {{0013-5194}}, journal = {{ELECTRONICS LETTERS}}, number = {{8}}, pages = {{546--548}}, title = {{{Optical 5 krad/s endless polarisation tracking}}}, doi = {{10.1049/el:20083720}}, volume = {{44}}, 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{19130, author = {{Caylak, Ismail and Mahnken, Rolf}}, issn = {{1617-7061}}, journal = {{PAMM}}, pages = {{4040013--4040014}}, title = {{{On the stabilization of tetrahedral finite elements using volume and area bubble functions}}}, doi = {{10.1002/pamm.200700224}}, year = {{2008}}, } @article{28206, author = {{Schneidt, Andreas and Mahnken, Rolf}}, issn = {{1617-7061}}, journal = {{PAMM}}, pages = {{4030013--4030014}}, title = {{{Experimentelle Untersuchungen zum Thermoschock beim Hybridumformprozess}}}, doi = {{10.1002/pamm.200700074}}, year = {{2008}}, } @article{28207, author = {{Wilmanns, Stefan and Mahnken, Rolf}}, issn = {{1617-7061}}, journal = {{PAMM}}, pages = {{4060037--4060038}}, title = {{{Simulation of asymmetric effects for shape memory alloys}}}, doi = {{10.1002/pamm.200700591}}, year = {{2008}}, } @inproceedings{38418, author = {{Hidayat, A. and Koch, B. and Mirvoda, V. and Zhang, H. and Bhandare, S. and Ibrahim, S. K. and Sandel, D. and Noé, Reinhold}}, booktitle = {{2008 CONFERENCE ON OPTICAL FIBER COMMUNICATION/NATIONAL FIBER OPTIC ENGINEERS CONFERENCE, VOLS 1-8}}, isbn = {{978-1-55752-856-8}}, pages = {{421--423}}, title = {{{Fast optical endless polarization tracking with LiNbO3 component}}}, year = {{2008}}, } @article{39941, author = {{Rösler, Margit and Voit, Michael}}, issn = {{1815-0659}}, journal = {{Symmetry, Integrability and Geometry: Methods and Applications}}, keywords = {{Geometry and Topology, Mathematical Physics, Analysis}}, number = {{083}}, pages = {{9pp}}, publisher = {{SIGMA (Symmetry, Integrability and Geometry: Methods and Application)}}, title = {{{A Limit Relation for Dunkl-Bessel Functions of Type A and B}}}, doi = {{10.3842/sigma.2008.083}}, volume = {{4}}, year = {{2008}}, } @article{40429, author = {{Grotjahn, Rebecca}}, journal = {{organ. Journal für die Orgel}}, number = {{4}}, pages = {{36–42}}, title = {{{Meditationen, Geheimnisse, Zufälle: Messiaens Konzept der langage communicable}}}, volume = {{11}}, year = {{2008}}, } @inproceedings{40868, abstract = {{Recently, a generalization of the magnitude squared coherence (MSC) spectrum for more than two random processes has been proposed. The generalized MSC (GMSC) spectrum definition, which is based on the largest eigenvalue of a matrix containing all the pairwise complex coherence spectra, provides a frequency-dependent measure of the linear relationship among several stationary random processes. Moreover, it can be easily estimated by solving a generalized eigenvalue problem. In this paper we apply the GMSC spectrum for detecting the presence of a common signal from a set of linearly distorted and noisy observations. Specifically, the new statistic for the multiple-channel detection problem is the integral of the square root of the GMSC, which can be estimated as the sum of the $P$ largest generalized canonical correlations (typically $P=1$ is enough in practice). Unlike previous approaches, the new statistic implicitly takes into account the spectral characteristics of the signal to be detected (e.g., its bandwidth). Finally, the performance of the proposed detector is compared in terms of its receiver operating characteristic (ROC) curve with the generalized coherence (GC) showing a clear improvement in most scenarios.}}, author = {{Ramírez, D. and Vía, J. and Santamaría, I.}}, booktitle = {{Proc.\ IAPR Work. Cognitive Information Process.}}, title = {{{Multiple-Channel Signal Detection using the Generalized Coherence spectrum}}}, year = {{2008}}, } @inproceedings{40866, abstract = {{This paper is concerned with orthogonal frequencydivision multiplexing interleave-division multiple-access (OFDMIDMA) systems over frequency-selective fading channels. Deliberate clipping is applied to reduce the peak-to-average power ratio (PAPR) of each user’s transmitted signal. An iterative multiuser detection (MUD) technique is developed to recover the performance loss due to clipping. A semi-analytical signal-to-noise ratio (SNR) evolution technique is proposed, which can provide quick and accurate prediction of the iterative MUD performance. Numerical results show that the performance of OFDM-IDMA is not sensitive to the frequency selectivity of channels, and OFDM-IDMA is more power-efficient than other alternative multi-carrier transmission techniques}}, author = {{Tong, Jun and Guo, Qinghua and Ping, Li}}, booktitle = {{IEEE 10th\ Int.\ Symp.\ Spread Spectrum Techn.\ & Appl.}}, pages = {{555–559}}, title = {{{Performance analysis of OFDM-IDMA systems with peak-power limitation}}}, doi = {{10.1109/ISSSTA.2008.109}}, year = {{2008}}, }