@article{13499, author = {{Thissen, Peter and Fuchs, Ehud and Roodenko, Katy and Peixoto, Tatiana and Batchelor, Ben and Smith, Dennis and Schmidt, Wolf Gero and Chabal, Yves}}, issn = {{1932-7447}}, journal = {{The Journal of Physical Chemistry C}}, pages = {{16947--16953}}, title = {{{Nanopatterning on H-Terminated Si(111) Explained as Dynamic Equilibrium of the Chemical Reaction with Methanol}}}, doi = {{10.1021/acs.jpcc.5b03816}}, volume = {{119}}, year = {{2015}}, } @article{13500, author = {{Lücke, A. and Schmidt, Wolf Gero and Rauls, E. and Ortmann, F. and Gerstmann, Uwe}}, issn = {{1520-6106}}, journal = {{The Journal of Physical Chemistry B}}, pages = {{6481--6491}}, title = {{{Influence of Structural Defects and Oxidation onto Hole Conductivity in P3HT}}}, doi = {{10.1021/acs.jpcb.5b03615}}, volume = {{119}}, year = {{2015}}, } @article{13502, author = {{Klein, C. and Vollmers, N. J. and Gerstmann, Uwe and Zahl, P. and Lükermann, D. and Jnawali, G. and Pfnür, H. and Tegenkamp, C. and Sutter, P. and Schmidt, Wolf Gero and Horn-von Hoegen, M.}}, issn = {{1098-0121}}, journal = {{Physical Review B}}, number = {{19}}, title = {{{Barrier-free subsurface incorporation of 3d metal atoms into Bi(111) films}}}, doi = {{10.1103/physrevb.91.195441}}, volume = {{91}}, year = {{2015}}, } @article{13503, abstract = {{

First-principles calculations were combined with scanning tunneling microscopy (STM) measurements to analyze the adsorption of diindenoperylene (DIP) molecules on Cu(111) surfaces.

}}, author = {{Aldahhak, Hazem and Matencio, S. and Barrena, E. and Ocal, C. and Schmidt, Wolf Gero and Rauls, E.}}, issn = {{1463-9076}}, journal = {{Physical Chemistry Chemical Physics}}, pages = {{8776--8783}}, title = {{{Structure formation in diindenoperylene thin films on copper(111)}}}, doi = {{10.1039/c4cp05271d}}, volume = {{17}}, year = {{2015}}, } @article{13504, author = {{Sanna, S. and Dues, C. and Schmidt, Wolf Gero}}, issn = {{0927-0256}}, journal = {{Computational Materials Science}}, pages = {{145--150}}, title = {{{Modeling atomic force microscopy at LiNbO 3 surfaces from first-principles}}}, doi = {{10.1016/j.commatsci.2015.03.025}}, volume = {{103}}, year = {{2015}}, } @article{13505, abstract = {{

First-principles calculations were combined with scanning tunneling microscopy (STM) measurements to analyze the adsorption of diindenoperylene (DIP) molecules on Cu(111) surfaces.

}}, author = {{Aldahhak, Hazem and Matencio, S. and Barrena, E. and Ocal, C. and Schmidt, Wolf Gero and Rauls, E.}}, issn = {{1463-9076}}, journal = {{Physical Chemistry Chemical Physics}}, pages = {{8776--8783}}, title = {{{Structure formation in diindenoperylene thin films on copper(111)}}}, doi = {{10.1039/c4cp05271d}}, volume = {{17}}, year = {{2015}}, } @article{13506, author = {{Sanson, A. and Zaltron, A. and Argiolas, N. and Sada, C. and Bazzan, M. and Schmidt, Wolf Gero and Sanna, S.}}, issn = {{1098-0121}}, journal = {{Physical Review B}}, title = {{{Polaronic deformation at theFe2+/3+impurity site inFe:LiNbO3crystals}}}, doi = {{10.1103/physrevb.91.094109}}, volume = {{91}}, year = {{2015}}, } @article{13507, author = {{Landmann, M. and Rauls, E. and Schmidt, Wolf Gero and Neumann, M. D. and Speiser, E. and Esser, N.}}, issn = {{1098-0121}}, journal = {{Physical Review B}}, title = {{{GaNm-plane: Atomic structure, surface bands, and optical response}}}, doi = {{10.1103/physrevb.91.035302}}, volume = {{91}}, year = {{2015}}, } @article{1370, author = {{Gries, Thomas and Palnau, Irene}}, issn = {{1554-8597}}, journal = {{Peace Economics, Peace Science and Public Policy}}, number = {{4}}, publisher = {{Walter de Gruyter GmbH}}, title = {{{Sustaining Civil Peace: A Configurational Comparative Analysis}}}, doi = {{10.1515/peps-2015-0020}}, volume = {{21}}, year = {{2015}}, } @techreport{1374, author = {{Gries, Thomas and Grundmann, Rainer and Palnau, Irene and Redlin, Margarete}}, title = {{{Does technological change drive inclusive industrialization? A review of major concepts and findings}}}, year = {{2015}}, } @article{13818, author = {{Neuba, Adam and Rohrmüller, Martin and Hölscher, Rebecca and Schmidt, Wolf Gero and Henkel, Gerald}}, issn = {{0020-1693}}, journal = {{Inorganica Chimica Acta}}, pages = {{225--238}}, title = {{{A panel of peralkylated sulfur–guanidine type bases: Novel pro-ligands for use in biomimetic coordination chemistry}}}, doi = {{10.1016/j.ica.2015.03.015}}, volume = {{430}}, year = {{2015}}, } @inproceedings{24287, abstract = {{Terahertz frequency band of 0.06 - 10 THz is especially interesting for ultra-high-speed wireless communication to achieve data rates of 100 Gbps or higher. To accommodate this demand, advanced terahertz signal processing techniques need to be investigated. Parallel Sequence Spread Spectrum (PSSS) is a physical layer (PHY) baseband technology that seems to be suited for being used for ultra-high speed wireless communication since the receiver architecture is especially simple and can be implemented almost completely in analog hardware. In this paper, a PSSS modulated signal at a chip rate of 20 Gcps with a spectral efficiency of (only) 1 bit/s/Hz is transmitted using a linearity limited 240 GHz wireless frontend. PSSS transceiver models are realized offline in MATLAB/Simulink. The PSSS transmitter generates the PSSS modulated symbols that are loaded onto an Arbitrary Waveform generator (AWG) and then transmitted using the available 240 GHz wireless frontend. A Digital Storage Oscilloscope (DSO) samples and stores the received signal. The PSSS receiver performs synchronization, channel estimation and demodulation. For a coded data rate of 20 Gbps, an eye opening of 40% and a BER of 5.4·10 -5 has been measured. These results are highly promising to achieve data rates of up to 100 Gbps with PSSS modulation using a RF-frontend having higher linear operating range and thus allowing increasing the bandwidth efficiency to 4 b/s/Hz.}}, author = {{KrishneGowda, Karthik and Messinger, Tobias and Wolf, Andreas and Kraemer, Rolf and Kallfass, Ingmar and Scheytt, Christoph}}, booktitle = {{ICUWB 2015}}, title = {{{Towards 100 Gbps Wireless Communication in THz Band with PSSS Modulation: A Promising Hardware in the Loop Experiment}}}, doi = {{10.1109/ICUWB.2015.7324520}}, year = {{2015}}, } @inproceedings{24286, author = {{Scheytt, Christoph and Javed, Abdul Rehman}}, booktitle = {{Workshop on Approximate Computing}}, location = {{Paderborn}}, title = {{{Shifting the Analog-Digital Boundary in Signal Processing: Should We Use Mixed-Signal "Approximate" Computing?}}}, year = {{2015}}, } @misc{24288, author = {{Adelt, Peer}}, publisher = {{Universität Paderborn, Fakultät EIM}}, title = {{{Analyse von Ausführungszeiten durch Integration einer statischen WCET-Analyse mit einer dynamischen Befehlssatzsimulation am Beispiel der TriCore-Architektur}}}, year = {{2015}}, } @inproceedings{24291, abstract = {{In this paper, a miniaturized 122 GHz ISM band FMCW radar is used to achieve micrometer accuracy. The radar consists of a SiGe single chip radar sensor and LCP off-chip antennas. The antennas are integrated in a QFN package. To increase the gain of the radar, an additional lens is used. A combined frequency and phase evaluation algorithm provides micrometer accuracy. The influence of the lens phase center on the beat frequency phase and hence, the overall accuracy is shown. Furthermore, accuracy limitations of the radar system over larger measurement distances are investigated. Accuracies of 200 μm and 2 μm are achieved over a distance of 1.9 m and 5 mm, respectively.}}, author = {{Scherr, Steffen and Göttel, Benjamin and Ayhan, Serdal and Bhutani, Akanksha and Pauli, Mario and Winkler, Wolfgang and Scheytt, Christoph and Zwick, Thomas}}, booktitle = {{European Microwave Week 2015}}, title = {{{Miniaturized 122 GHz ISM Band FMCW Radar with Micrometer Accuracy}}}, doi = {{10.1109/EuRAD.2015.7346291}}, year = {{2015}}, } @inproceedings{24289, author = {{Müller, Wolfgang and Wu, Liang and Scheytt, Christoph and Becker, Markus and Schoenberg, Sven}}, booktitle = {{Proceedings of the 1st International Workshop on Resiliency in Embedded Electronic Systems (REES 2014)}}, editor = {{Mueller-Gritschneder, Daniel and Müller, Wolfgang and Mitra, Subhasish}}, title = {{{On the Correlation of HW Faults and SW Errors}}}, year = {{2015}}, } @phdthesis{24298, abstract = {{This thesis investigates the design and realization of integrated planar antennas for millimeter-wave applications. The state-of-the-art antenna integration and packaging technologies are extensively studied, and an antenna design flow is proposed. A number of integrated antenna designs by applying different integration approaches and technologies, i.e. on printed circuit board (PCB), on-chip and in Benzocyclobutene (BCB) above-wafer process, are presented. The designs target not only high performance, but also the practical considerations of low-cost, feasibility, better reliability, and good reproducibility. They cover the industrial, medical, and scientific (ISM) bands of 60 GHz, 122 GHz, and 245 GHz in the millimeter-wave range with outstanding performance in a low-cost fashion by applying innovative, appropriate integration methods and sophisticated design. By applying the localized backside etching (LBE) process the presented on-chip antennas achieve measured peak gains of 6–8.4 dBi for above 100 GHz applications with simulated efficiencies of 54–75%. These figures are comparable to that of on-board or in-package antennas. To the best of my knowledge, the achieved gain of 7.5–8.4 dBi in the band of 124–134 GHz for the 130 GHz on-chip double folded dipole antenna is the highest reported result to date for planar on-chip antennas based on low-resistivity silicon technologies. System demonstrators with integrated antennas are realized and measured. The 60 GHz demonstrator with on-PCB differential bunny-ear antenna and a novel bond-wire compensation scheme achieves a data rate of 3.6 Gbit/s over a 15-meter distance, which was the best reported analog front-end without beamforming function in silicon technology regarding both the data rate and transmission distance at the time of its publication. A 245 GHz single-channel transmitter and a single-channel receiver with integrated on-chip antennas are also demonstrated. An effective isotropic radiated power (EIRP) of 7–8 dBm is achieved for the transmitter, which is the highest reported value at 245 GHz for a SiGe transmitter with a single antenna so far. Furthermore, the receiver has the highest reported integration level for any 245 GHz SiGe receiver. A 245 GHz 4-channel-transmitter array with integrated on-chip antenna array is also realized to achieve spatial power combining, which offers 11 dB higher EIRP than a single-channel transmitter. From the presented results of the thesis it is feasible to realize high performance integrated planar antennas in the entire millimeter-wave range and beyond in a cost-effective fashion. }}, author = {{Wang, Ruoyu}}, publisher = {{Verlagsschriftenreihe des Heinz Nixdorf Instituts, Paderborn}}, title = {{{Integrated Planar Antenna Designs and Technologies for Millimeter-Wave Applications}}}, volume = {{338}}, year = {{2015}}, } @inproceedings{24294, abstract = {{Parallel Sequence Spread Spectrum (PSSS) is a physical layer (PHY) baseband technology which is gaining interest for both wireless and wired multi-gigabit communication systems. PSSS is well suited for mixed signal transceiver implementation including channel equalization and allows for a reduction in power dissipation by avoiding high speed data converters. The architecture of a mixed signal baseband processor for 100 Gbps wireless communication is described that reduces the implementation complexity and results in a consequent reduction in power dissipation and chip area.}}, author = {{Javed, Abdul Rehman and Scheytt, Christoph and KrishneGowda, Karthik and Kraemer, Rolf}}, booktitle = {{Wireless and Microwave Technology Conference (WAMICON)}}, pages = {{1--4}}, publisher = {{IEEE}}, title = {{{System Design Considerations for a PSSS transceiver for 100Gbps wireless communication with emphasis on mixed Signal implementation}}}, doi = {{10.1109/WAMICON.2015.7120419}}, year = {{2015}}, } @phdthesis{24299, abstract = {{Die Arbeit befasst sich mit integrierten Schaltungen in SiGe BiCMOS – Technologie für Anwendungen in der Gasspektroskopie. Zunächst wird das Übertragungsleitungsdesign für das 122GHz cascode LNA-Design diskutiert. Verschiedene Topologien für die Übertragungsleitung werden in der glei- chen cascode LNA verglichen. Dann wird das Schaltungsdesign von LNAs bei 245 GHz diskutiert und die mehrstufige gemeinsame Basis LNA vorgestellt. Simulationen und Messergebnisse für die gemeinsame Basis LNA werden vorgegeben. Im nächs- ten Schritt wird die Gestaltung und Transkonduktanz subharmonischer Mischer und passiver subharmonischer Mischer untersucht und realisiert. Mess- und Simulations- ergebnisse des subharmonischen Mischers werden vorgegeben. Dann werden die Simulations- und Messergebnisse der drei integrieten subharmonischen Empfänger von CB LNA und SHM dargestellt und verglichen. Ferner ist ein subharmonischer Empfänger in Gasspektroskopie-Anwendungen beschrieben. Design-Überlegungen für das Basissystem und Messergebnisse werden vorgestellt. Abschließend werden Schlussfolgerungen gezogen. }}, author = {{Mao, Yanfei}}, publisher = {{Verlagsschriftenreihe des Heinz Nixdorf Instituts, Paderborn}}, title = {{{245 GHz Subharmonic Receivers For Gas Spectroscopy in SiGe BiCMOS Technology}}}, volume = {{339}}, year = {{2015}}, } @inproceedings{24293, abstract = {{Parallel Sequence Spread Spectrum (PSSS) is a physical layer baseband technology wherein parallel data streams are transmitted simultaneously by spreading them using orthogonal codes. PSSS was selected for the wireless sensor network standard IEEE802.15.4-2006 to increase data rate and improve performance in fading channels for frequency bands below 1 GHz. Since then it has gained interest for both wireless and wired communication links.}}, author = {{Javed, Abdul Rehman and Scheytt, Christoph}}, booktitle = {{1st URSI Atlantic Radio Science Conference (URSI AT-RASC 2015)}}, title = {{{System Design and Simulation of a PSSS Based Mixed Signal Transceiver for a 20 Gbps Bandwidth Limited Communication Link}}}, doi = {{10.1109/URSI-AT-RASC.2015.7302987}}, year = {{2015}}, }