@article{9867, abstract = {{We report the piezoelectric properties of CuO-doped hydrothermal (K,Na)NbO3 ceramics that can be applied as hard-type lead-free piezoelectric ceramics. To date, we have succeeded in synthesizing high-quality KNbO3 and NaNbO3 powders by the hydrothermal method, which is based on an ionic reaction at high temperature (around 210 $\,^{\circ}$C) and pressure. Increasing both the piezoelectric constant d and the mechanical quality factor (Qm) is important for resonance-type piezoelectric devices, such as ultrasonic motors and transformers. CuO doping into hydrothermal (K,Na)NbO3 ceramics was examined to realize hard-type lead-free piezoelectric ceramics. By doping with 1.2 mol \% CuO, Qm was increased and the dielectric loss (tan δ) was decreased to 0.5\%. The grain size was also influenced by the amount of CuO doping, which indicates that Qm is related to the density. To achieve a higher Qm value, the grain size is required to be less than 5 µm; however, excessive CuO doping leads to anomalous grain growth. Optimal piezoelectric properties were obtained for 1.2 mol \% CuO-doped (K,Na)NbO3; k31 = 0.32, d31 = -44 pC/N, Qm (radial) = 959, and tan δ= 0.5\%. These characteristics showed that CuO doping with hydrothermal powders is effective for obtaining hard-type ceramics, and the mechanical quality factor is more than ten times higher than that of nondoped hydrothermal (K,Na)NbO3 ceramics. Therefore, compared with the conventional solid-state method, we could succeed in obtaining hard-type ceramics by a simple and short process.}}, author = {{Yokouchi, Yuriko and Maeda, Takafumi and Bornmann, Peter and Hemsel, Tobias and Morita, Takeshi}}, journal = {{Japanese Journal of Applied Physics}}, number = {{7S}}, title = {{{Piezoelectric Properties of CuO-Doped (K,Na)NbO3 Lead-Free Ceramics Synthesized with Hydrothermal Powders}}}, doi = {{10.7567/JJAP.52.07HB03}}, volume = {{52}}, year = {{2013}}, } @article{3959, abstract = {{Microresonators containing quantum dots find application in devices like single photon emitters for quantum information technology as well as low threshold laser devices. We demonstrate the fabrication of 60 nm thin zinc-blende AlN microdisks including cubic GaN quantum dots using dry chemical etching techniques. Scanning electron microscopy analysis reveals the morphology with smooth surfaces of the microdisks. Micro-photoluminescence measurements exhibit optically active quantum dots. Furthermore this is the first report of resonator modes in the emission spectrum of a cubic AlN microdisk.}}, author = {{Bürger, M. and Kemper, R.M. and Bader, C.A. and Ruth, M. and Declair, S. and Meier, Cedrik and Förstner, Jens and As, D.J.}}, issn = {{0022-0248}}, journal = {{Journal of Crystal Growth}}, keywords = {{tet_topic_qd, tet_topic_microdisk}}, pages = {{287--290}}, publisher = {{Elsevier BV}}, title = {{{Cubic GaN quantum dots embedded in zinc-blende AlN microdisks}}}, doi = {{10.1016/j.jcrysgro.2012.12.058}}, volume = {{378}}, year = {{2013}}, } @article{3963, abstract = {{Whispering gallery modes (WGMs) were observed in 60 nm thin cubic AlN microdisk resonators containing a single layer of non-polar cubic GaN quantum dots. Freestanding microdisks were patterned by means of electron beam lithography and a two step reactive ion etching process. Micro-photoluminescence spectroscopy investigations were performed for optical characterization. We analyzed the mode spacing for disk diameters ranging from 2-4 lm. Numerical investigations using three dimensional finite difference time domain calculations were in good agreement with the experimental data. Whispering gallery modes of the radial orders 1 and 2 were identified by means of simulated mode field distributions.}}, author = {{Bürger, M. and Ruth, M. and Declair, S. and Förstner, Jens and Meier, Cedrik and As, Donat Josef}}, issn = {{0003-6951}}, journal = {{Applied Physics Letters}}, keywords = {{tet_topic_qd, tet_topic_microdisk}}, number = {{8}}, pages = {{081105}}, publisher = {{AIP Publishing}}, title = {{{Whispering gallery modes in zinc-blende AlN microdisks containing non-polar GaN quantum dots}}}, doi = {{10.1063/1.4793653}}, volume = {{102}}, year = {{2013}}, } @article{3976, author = {{Bauhoff, Frauke and Schneider, Martin}}, journal = {{Industrielle Beziehungen/The German Journal of Industrial Relations}}, pages = {{54----76}}, title = {{{„Sekret{\"a}rin des Vorstandes “gesucht: Stellenanzeigen und die expressive Funktion des AGG}}}, year = {{2013}}, } @article{3979, author = {{Bauhoff, Frauke and Schneider, Martin}}, journal = {{Industrielle Beziehungen/The German Journal of Industrial Relations}}, pages = {{54----76}}, title = {{{„Sekretärin des Vorstandes“ gesucht: Stellenanzeigen und die expressive Funktion des AGG}}}, year = {{2013}}, } @inbook{4094, author = {{Kemper, R.M. and As, Donald and Lindner, Jörg}}, booktitle = {{Silicon-based Nanomaterials}}, editor = {{Li, H. and Wu, J. and Wang, Z.M.}}, isbn = {{978-1-4614-8168-3}}, pages = {{381--405}}, publisher = {{Springer Series in Materials Science}}, title = {{{Cubic GaN on nano-patterned 3C-SiC/Si (001) substrates}}}, volume = {{187}}, year = {{2013}}, } @inproceedings{4097, author = {{Brassat, Katharina and Pauly, Johannes and Kemper, R. and Strake, M. and Brodehl, Christoph and Sievers, Werner and Riedl, Thomas and Lindner, Jörg}}, location = {{Paderborn}}, title = {{{Colloidal nano-lithography: state-of-the-art}}}, year = {{2013}}, } @article{4098, abstract = {{The selective deposition and self-assembly of nanospheres from a colloidal suspension in trenches on silicon surfaces is investigated using conventional light, confocal laser scanning and scanning electron microscopy. Trenches with widths of one to several nanosphere diameters are formed on silicon surfaces by photolithography and reactive ion etching. The spreading knife convective self-assembly technique is employed to distribute the nanosphere suspension on the pre-patterned surface. It is shown that this technique is particularly useful in combination with a functionalized surface where a selfassembled molecular monolayer changes the contact angle such that sphere deposition takes place almost exclusively in the trenches. By this, lines selectively filled with a chain of beads with a length of 0.5 mm have been achieved.}}, author = {{Brassat, Katharina and Assion, Fabian and Hilleringmann, Ulrich and Lindner, Jörg}}, issn = {{1862-6300}}, journal = {{physica status solidi (a)}}, location = {{Warsaw (Poland)}}, number = {{8}}, pages = {{1485--1489}}, publisher = {{Wiley}}, title = {{{Self-organization of nanospheres in trenches on silicon surfaces}}}, doi = {{10.1002/pssa.201200899}}, volume = {{210}}, year = {{2013}}, } @inproceedings{4100, author = {{Brassat, Katharina and Lindner, Jörg}}, location = {{Regensburg}}, title = {{{Selective deposition of nanospheres in trenches on silicon surfaces by self-organisation}}}, year = {{2013}}, } @inproceedings{4101, author = {{Brodehl, Christoph and Greulich-Weber, Siegmund and Lindner, Jörg}}, location = {{Paderborn}}, title = {{{Tailored structures produced via nanosphere lithography}}}, year = {{2013}}, } @inproceedings{4103, author = {{Dogan, M. and Kemper, R.M. and Lindner, Jörg}}, location = {{Boston}}, title = {{{Dewetting and Redistribution of an Au Catalyst on Nanopatterned 3C-SiC/Si (001) Surfaces}}}, year = {{2013}}, } @inproceedings{4106, author = {{Lindner, Jörg and Kemper, R.M. and As, Donald and Meeertens, D. and Kovács, A. and Luysberg, M. and Tillmann, K.}}, location = {{Regensburg}}, pages = {{188--189}}, title = {{{Characterization of cubic GaN/AlN multi-quantum wells using state-of-the-art analytical STEM}}}, year = {{2013}}, } @article{4107, author = {{Lindner, Jörg}}, issn = {{1818-2259}}, journal = {{SPIE Newsroom}}, publisher = {{SPIE-Intl Soc Optical Eng}}, title = {{{Nanosphere lithography for device fabrication}}}, doi = {{10.1117/2.1201310.005154}}, year = {{2013}}, } @inproceedings{4109, author = {{Pauly, Johannes and Lindner, Jörg}}, location = {{Regensburg (Germany)}}, title = {{{Nickel Nanodot Arrays on Silicon formed by Nanosphere Lithography: A TEM Study}}}, year = {{2013}}, } @inproceedings{4110, author = {{Riedl, Thomas and Lindner, Jörg}}, location = {{Boston (USA)}}, title = {{{Self-organized Fabrication of Periodic Nanocolumn Arrays on GaAs Surfaces}}}, year = {{2013}}, } @article{4111, abstract = {{In this article we study the elemental distribution and solute solubility in nanocrystalline alloys of immiscible components near restricted equilibrium for the case of the binary Cu–Ag system. As predicted from thermodynamic considerations, a grain boundary segregated monophase alloy is observed in the annealed mechanically alloyed state for low Ag content by using atom probe tomography. From the detected Ag solute grain boundary enrichment the segregation free enthalpy is estimated to range between -25 and -49 kJ mol^-1 following the McLean equation, in agreement with values reported for coarse-grained Cu–Ag. The extension of the alloying range is described by a two-domain thermodynamic model that considers the excess free volume in the grain boundaries and the strain in the strain interior on the basis of the universal equation of state at negative pressure. To access the grain boundary volumetric strain experimentally, a method based on a combination of density measurements and microscopical quantification of closed pore areas is presented. Moreover, we apply x-ray diffraction line broadening analysis to determine the local strain amplitude, which yields a root-mean-square microstrain of 0.3% for a grain size of 30 nm. It is shown that the grain boundary free volume represents the major origin for the global solubility enhancement in nanocrystalline Cu–Ag at 503 K.}}, author = {{Riedl, Thomas and Kirchner, A and Eymann, K and Shariq, A and Schlesiger, R and Schmitz, G and Ruhnow, M and Kieback, B}}, issn = {{0953-8984}}, journal = {{Journal of Physics: Condensed Matter}}, number = {{11}}, publisher = {{IOP Publishing}}, title = {{{Elemental distribution, solute solubility and defect free volume in nanocrystalline restricted-equilibrium Cu–Ag alloys}}}, doi = {{10.1088/0953-8984/25/11/115401}}, volume = {{25}}, year = {{2013}}, } @inproceedings{4113, author = {{Lindner, Jörg}}, location = {{Kusadasi (Turkey)}}, title = {{{Ion Interactions with Nanopatterned Surfaces}}}, year = {{2013}}, } @misc{500, author = {{Staschewski, Margarita}}, publisher = {{Universität Paderborn}}, title = {{{Price Formation in the Restaurant Industry - An Empirical Analysis}}}, year = {{2013}}, } @phdthesis{501, abstract = {{Handling run-time dynamics on embedded system-on-chip architectures has become more challenging over the years. On the one hand, the impact of workload and physical dynamics on the system behavior has dramatically increased. On the other hand, embedded architectures have become more complex as they have evolved from single-processor systems over multi-processor systems to hybrid multi-core platforms.Static design-time techniques no longer provide suitable solutions to deal with the run-time dynamics of today's embedded systems. Therefore, system designers have to apply run-time solutions, which have hardly been investigated for hybrid multi-core platforms.In this thesis, we present fundamental work in the new area of run-time management on hybrid multi-core platforms. We propose a novel architecture, a self-adaptive hybrid multi-core system, that combines heterogeneous processors, reconfigurable hardware cores, and monitoring cores on a single chip. Using self-adaptation on thread-level, our hybrid multi-core systems can effectively perform performance and thermal management autonomously at run-time. }}, author = {{Happe, Markus}}, isbn = {{978-3-8325-3425-7}}, pages = {{220}}, publisher = {{Logos Verlag Berlin GmbH}}, title = {{{Performance and thermal management on self-adaptive hybrid multi-cores}}}, year = {{2013}}, } @inproceedings{502, abstract = {{Self-adaptation allows continuously running software systems to operate in changing and uncertain contexts while meeting their requirements in a broad range of contexts, e.g., from low to high load situations. As a consequence, requirementsfor self-adaptive systems are more complex than requirements for static systems as they have to explicitly address properties of the self-adaptation layer.While approaches exist in the literature to capture this new type of requirements formally, their achievement cannot be analyzed in early design phases yet. In this paper, we apply RELAX to formally specify non-functional requirements for self-adaptive systems. We then apply our model-based SimuLizar approach for a semi-automatic analysis to test whether the self-adaptation layer ensures that these non-functional requirements are met. We evaluate our approach on the design of a proof-of-concept load balancer system. As this evaluation demonstrates, we can iteratively improve our system design by improving unsatisfactory self-adaption rules.}}, author = {{Becker, Matthias and Luckey, Markus and Becker, Steffen}}, booktitle = {{Proceedings of the 9th ACM SigSoft International Conference on Quality of Software Architectures (QoSA'13)}}, pages = {{43--52 }}, title = {{{Performance Analysis of Self-Adaptive Systems for Requirements Validation at Design-Time}}}, doi = {{10.1145/2465478.2465489}}, year = {{2013}}, }