@article{62790,
  abstract     = {{<jats:title>Abstract</jats:title><jats:p>We present an efficient model for the simulation of solid to solid phase‐transformations in polycrystalline materials. As a basis, we implement a scalar‐valued Gibbs‐energy‐barrier‐based phase‐transformation model making use of statistical physics. In this work, we particularly adopt the model for the simulation of phase‐transformations between an austenitic parent phase and a martensitic tension and compression phase. The incorporation of plasticity phenomena is established by enhancing the Helmholtz free energy functions of the material phases considered, where the plastic driving forces acting in each phase are derived from the overall free energy potential. The coupled model is embedded into a micro‐sphere formulation in order to simulate three‐dimensional boundary value problems—a technique well‐established in the context of computational inelasticity at small strains. It is shown that the model is capable of reflecting experimentally observed behaviour. (© 2011 Wiley‐VCH Verlag GmbH &amp; Co. KGaA, Weinheim)</jats:p>}},
  author       = {{Ostwald, Richard and Bartel, Thorsten and Menzel, Andreas}},
  issn         = {{1617-7061}},
  journal      = {{PAMM}},
  number       = {{1}},
  pages        = {{417--418}},
  publisher    = {{Wiley}},
  title        = {{{Interaction of phase‐transformations and plasticity – a multi‐phase micro‐sphere approach}}},
  doi          = {{10.1002/pamm.201110200}},
  volume       = {{11}},
  year         = {{2011}},
}

@article{62789,
  author       = {{Biermann, D. and Menzel, A. and Bartel, T. and Höhne, F. and Holtermann, R. and Ostwald, Richard and Sieben, B. and Tiffe, M. and Zabel, A.}},
  issn         = {{1877-7058}},
  journal      = {{Procedia Engineering}},
  pages        = {{22--27}},
  publisher    = {{Elsevier BV}},
  title        = {{{Experimental and Computational Investigation of Machining Processes for Functionally Graded Materials}}},
  doi          = {{10.1016/j.proeng.2011.11.074}},
  volume       = {{19}},
  year         = {{2011}},
}

@article{4091,
  abstract     = {{We present a nonequilibrium ab initio method for calculating nonlinear and nonlocal optical effects in metallic slabs with a thickness of several nanometers. The numerical analysis is based on the full solution of the time‐dependent Kohn–Sham equations for a jellium system and allows to study the optical response of metal electrons subject to arbitrarily shaped intense light pulses. We find a strong localization of the generated second‐harmonic current in the surface regions of the slabs. }},
  author       = {{Wand, Mathias and Schindlmayr, Arno and Meier, Torsten and Förstner, Jens}},
  issn         = {{1521-3951}},
  journal      = {{Physica Status Solidi B}},
  keywords     = {{tet_topic_shg}},
  number       = {{4}},
  pages        = {{887--891}},
  publisher    = {{Wiley-VCH}},
  title        = {{{Simulation of the ultrafast nonlinear optical response of metal slabs}}},
  doi          = {{10.1002/pssb.201001219}},
  volume       = {{248}},
  year         = {{2011}},
}

@article{33564,
  author       = {{Rezat, Sara}},
  journal      = {{Didaktik Deutsch}},
  number       = {{31}},
  pages        = {{50--67}},
  title        = {{{Schriftliches Argumentieren. Zur Ontogenese konzessiver Argumentationskompetenz}}},
  year         = {{2011}},
}

@inbook{65340,
  author       = {{Droß-Krüpe, Kerstin}},
  booktitle    = {{Wearing the Cloak. Dressing the Soldier in Roman Times}},
  editor       = {{Nosch, M.-L.}},
  pages        = {{13--18}},
  title        = {{{Purchase Orders of Military Garments from Papyri of Roman Egypt}}},
  volume       = {{10}},
  year         = {{2011}},
}

@book{65107,
  author       = {{Droß-Krüpe, Kerstin}},
  pages        = {{304}},
  publisher    = {{Harrassowitz}},
  title        = {{{Wolle – Weber – Wirtschaft. Die Textilproduktion der römischen Kaiserzeit im Spiegel der papyrologischen Überlieferung}}},
  year         = {{2011}},
}

@article{5195,
  abstract     = {{This article analyses 336 German venture capital transactions from 1990 to 2005 and seeks to determine why selected financial securities differ across deals. We find that a broad array of financial instruments is used, covering straight equity, mezzanine and debt‐like securities. Based on the chosen financial securities’ upside potential and downside protection characteristics, we provide an explanation for the differing use of these securities. Our results show that investors’ deal experience, adverse selection risks and economic prospects in the public equity market influence the selection of financial securities. }},
  author       = {{Hartmann-Wendels, Thomas and Keienburg, Georg and Sievers, Sönke}},
  journal      = {{European Financial Management (VHB-JOURQUAL 4 Ranking B)}},
  keywords     = {{venture capital, capital structure, contract theory, deal experience}},
  number       = {{3}},
  pages        = {{464--499}},
  publisher    = {{Wiley Online Library}},
  title        = {{{Adverse selection, investor experience and security choice in venture capital finance: evidence from Germany}}},
  doi          = {{10.1111/j.1468-036X.2010.00568.x}},
  volume       = {{17}},
  year         = {{2011}},
}

@article{22919,
  author       = {{Müller, Jens and Sureth-Sloane, Caren}},
  issn         = {{2366-6153}},
  journal      = {{Schmalenbachs Zeitschrift für betriebswirtschaftliche Forschung}},
  number       = {{13}},
  pages        = {{45--83}},
  title        = {{{Marktnahe Bewertung von Unternehmen nach der Erbschaftsteuerreform?}}},
  doi          = {{10.1007/bf03372991}},
  volume       = {{63}},
  year         = {{2011}},
}

@misc{66822,
  author       = {{Pöllmann, Andreas}},
  booktitle    = {{Ethnic and Racial Studies}},
  issn         = {{0141-9870}},
  number       = {{10}},
  pages        = {{1780--1781}},
  publisher    = {{Informa UK Limited}},
  title        = {{{Being brown in Dixie: Race, ethnicity, and Latino immigration in the New South}}},
  doi          = {{10.1080/01419870.2011.605379}},
  volume       = {{34}},
  year         = {{2011}},
}

@misc{66821,
  author       = {{Pöllmann, Andreas}},
  booktitle    = {{Sociology}},
  issn         = {{0038-0385}},
  number       = {{5}},
  pages        = {{933--934}},
  publisher    = {{SAGE Publications}},
  title        = {{{National days: Constructing and mobilizing national identity}}},
  doi          = {{10.1177/0038038511413417}},
  volume       = {{45}},
  year         = {{2011}},
}

@article{3418,
  author       = {{Hehenkamp, Burkhard and Wambach, Achim}},
  journal      = {{Journal of Economic Behavior & Organization}},
  number       = {{3}},
  pages        = {{853----858}},
  title        = {{{Survival at the center—the stability of minimum differentiation}}},
  year         = {{2010}},
}

@inbook{1117,
  author       = {{Geierhos, Michaela and Blanc, Olivier}},
  booktitle    = {{Actes du 27e Colloque international sur le lexique et la grammaire (L’Aquila, 10-13 septembre 2008)}},
  editor       = {{De Gioia, Michele}},
  isbn         = {{9788854831667}},
  location     = {{Rome, Italy}},
  pages        = {{95--110}},
  publisher    = {{Aracne}},
  title        = {{{BiographIE - Biographical Information Extraction from Business News}}},
  volume       = {{2}},
  year         = {{2010}},
}

@article{9743,
  abstract     = {{The hydrothermal method enables the production of high-quality piezoelectric materials. In this study, we propose to irradiate the reaction solutions with ultrasonic power during the hydrothermal method to obtain a shorter reaction time and a smooth film surface. A high-pressure reaction container for the ultrasonic transducer was newly developed, and the ultrasonically-assisted hydrothermal method was examined by using this container. The effect of ultrasonic assist on the synthesis of lead-zirconate-titanate (PZT) thin films and (K,Na)NbO$_{3}$ powders was verified. Thicker PZT film, thickness around 10 ${\mu}$m, could be obtained in one process, and (K,Na)NbO$_{3}$ powder was synthesized in half the previous reaction time.}},
  author       = {{Ageba, Ryo and Kadota, Yoichi and Maeda, Takafumi and Takiguchi, Norihito and Morita, Takeshi and Ishikawa, Mutsuo and Bornmann, Peter and Hemsel, Tobias}},
  issn         = {{1948-5719}},
  journal      = {{Journal of Korean Physical Society}},
  keywords     = {{Hydrothermal method, High-power ultrasonic, PZT thin film, Lead-free piezoelectric materials}},
  number       = {{4}},
  pages        = {{918--923}},
  title        = {{{Ultrasonically-assisted Hydrothermal Method for Ferroelectric Material Synthesis}}},
  doi          = {{10.3938/jkps.57.918}},
  volume       = {{57}},
  year         = {{2010}},
}

@article{9744,
  abstract     = {{Direct ultrasound irradiation is advantageous to increase the efficiency of the hydrothermal method which can be used for the production of piezoelectric thin films and lead free piezoelectric ceramics. To apply ultrasound directly to the process transducer prototypes were developed regarding the boundary conditions of the hydrothermal method. LiNbO$_{3}$ and PIC 181 were proven as feasible materials for high temperature resistant transducers ($\geq 200^\circ C$). Resistance of the transducers horn against the corrosive mineralizer was achieved by using Hastelloy C-22. The efficiency of the ultrasound assisted hydrothermal method depends on the generated sound field. Impedance and sound field measurements have shown that the sound field depends on the filling level and the position and design of the transducer.}},
  author       = {{Bornmann, Peter and Hemsel, Tobias and Littmann, Walter and Ageba, Ryo and Kadota, Yoishi and Morita, Takeshi}},
  issn         = {{1948-5719}},
  journal      = {{Journal of Korean Physical Society}},
  keywords     = {{High-temperature transducer, Hydrothermal method, Lithium-niobate transducer}},
  number       = {{4}},
  pages        = {{1122}},
  title        = {{{Ultrasonic Transducer for the Hydrothermal Method}}},
  doi          = {{10.3938/jkps.57.1122}},
  volume       = {{57}},
  year         = {{2010}},
}

@article{9745,
  abstract     = {{In the modeling of piezoelectric Langevin transducers using usual transfer matrix methods, some simplifications have been adopted. This leads to reduction of the model quality. A mixed transfer matrix method is employed in the modeling of Langevin transducers, where the pre-stressed bolt is modeled as a separate four-pole element, which is connected to other elements in parallel. Based on the mixed transfer matrix method, the four (six)-pole element description of the piezoelectric Langevin transducer is built up and the total transfer matrix relation is derived. The resonance frequencies of the transducer are calculated and then measured using the impedance analyzer (HP4192). Experimental result shows that the mixed transfer matrix method has better modeling quality than the usual transfer matrix method for the vibration analysis of piezoelectric Langevin transducers.}},
  author       = {{Fu, Bo and Li, Chao and Zhang, Jianming and Huang, Zhenwei and Hemsel, Tobias}},
  issn         = {{1948-5719}},
  journal      = {{Journal of Korean Physical Society}},
  keywords     = {{Piezoelectric langevin transducer, Transfer matrix method, Four (six)-pole element description, Pre-stressed bolt}},
  number       = {{4}},
  pages        = {{929}},
  title        = {{{Modeling of Piezoelectric Langevin Transducers by Using Mixed Transfer Matrix Methods}}},
  doi          = {{10.3938/jkps.57.929}},
  volume       = {{57}},
  year         = {{2010}},
}

@article{9748,
  abstract     = {{For many technical applications it is necessary to avoid or to reduce vibrations. Factors benefiting from vibration reduction are for example the durability of the application, which is increased, as well as cost expenses and the level of noise, which are both decreased. Rough, bolted interfaces are common in most machines and can be used as damping devices with some effort. Perhaps in future such contact surfaces could be used as damping devices at the interfaces of an automotive engine or exhaust system. Nevertheless it is difficult to predict the effect of a change in contact interface parameters on the dynamic behavior of the entire mechanical system. Therefore a method for calculating the steady state behavior of elastic multi-body systems was developed. The basis of this method is a finite element model of each contacting unit. On each model a modal reduction is applied in order to reduce the degrees of freedom. The method of Ritz and Galerkin is used to calculate the frequency response functions of the reduced system including contact. This method allows the calculation of the steady-state behavior of elastic multi-body systems with rough, bolted contact interfaces, by taking the pre-stress of the bolts, the roughness and the friction coefficient of the contacting surfaces as parameters. In order to verify calculated results, a test stand was built. The comparison of calculated and experimental results showed a satisfying correlation.}},
  author       = {{ Hölzl, Johannes Sebastian and Sextro, Walter}},
  journal      = {{SAE International Journal of Passenger Cars- Mechanical Systems}},
  keywords     = {{Automotive}},
  pages        = {{929--935}},
  title        = {{{Simulation of the Dynamical Behavior of Elastic Multi-Body Systems with Bolted, Rough Contact Interfaces}}},
  doi          = {{10.4271/2010-01-1422}},
  year         = {{2010}},
}

@article{9749,
  abstract     = {{Piezoelectric materials find wide application in technical systems. Most often, a combination of piezoelectric and other materials is advantageous. The position and the amount of the piezoelectric material within the overall system depends on various aspects like maximum mechanical output to the load, maximum electromechanical efficiency of the system, maximum utilization of the piezoelectric material, minimum self-heating of the piezoelectric material, and controllability of the system, which might be key aspects for the optimisation of the system design. For a composite longitudinal vibrator (bolted Langevin transducer), which is a base for many technical applications, this contribution shows in detail, how above mentioned aspects depend on the position and volume of the piezoelectric material related to the mode shape.}},
  author       = {{Hemsel, Tobias and Lierk, Ernst Günther and Littmann, Walter and Morita, Takeshi}},
  issn         = {{1948-5719}},
  journal      = {{Journal of Korean Physical Society}},
  keywords     = {{Bolted Langevin transducer, Optimum placement of piezoelectric ceramics}},
  number       = {{4}},
  pages        = {{933--937}},
  title        = {{{Various Aspects of the Placement of a Piezoelectric Material in Composite Actuators, Motors, and Transducers}}},
  doi          = {{10.3938/jkps.57.933}},
  volume       = {{57}},
  year         = {{2010}},
}

@article{9751,
  abstract     = {{Piezoelectric inertia motors have a simple construction and are controlled by a single driving signal. This allows for miniaturization and low cost production. One of the main questions to be answered during the design process of a piezoelectric inertia motor is which electrical excitation signal yields optimum motor characteristics. Three signals and their variants are widely used in literature: sawtooth, parabolic and cycloidic signals. It can be shown that neither of these can drive the motor at its maximum possible velocity in non-resonant operation. Within this paper we propose to use a rigid body model of a simple inertia motor to predict the motor characteristics depending on the movement pattern of the driving element. Advantages and disadvantages of three different drive signals that maximize the motor velocity are discussed.}},
  author       = {{Hunstig, Matthias and Hemsel, Tobias}},
  issn         = {{1948-5719}},
  journal      = {{Journal of Korean Physical Society}},
  number       = {{4}},
  pages        = {{938--941}},
  title        = {{{Drive Signals for Maximizing the Velocity of Piezoelectric Inertia Motors}}},
  doi          = {{10.3938/jkps.57.938}},
  volume       = {{57}},
  year         = {{2010}},
}

@article{9752,
  abstract     = {{Piezoelectric inertia motors make use of the inertia of a slider to drive the slider by friction contact in a series of small steps which are generally composed of a stick phase and a slip phase. If the best electrical drive signal for the piezoelectric actuator in an inertia motor is to be determined, its dynamical behaviour must be known. A classic dynamic lumped parameter model for piezoelectric actuators is valid only in resonance and, therefore, is not suitable for modelling the actuator in an inertia motor. A reduced dynamic model is used instead. Its parameters are identified using a step response measurement. This model is used to predict the movement of the actuator in response to a velocity-optimized signal introduced in a separate contribution. Results show that the model cannot represent the dynamical characteristics of the actuator completely. For determining voltage signals that let piezoelectric actuators follow a calculated movement pattern exactly, the model can, therefore, only be used with limitations.}},
  author       = {{Hunstig, Matthias and Hemsel, Tobias}},
  issn         = {{1948-5719}},
  journal      = {{Journal of Korean Physical Society}},
  number       = {{4}},
  pages        = {{952--954}},
  title        = {{{Parameter Identification and Model Validation for the Piezoelectric Actuator in an Inertia Motor}}},
  doi          = {{10.3938/jkps.57.952}},
  volume       = {{57}},
  year         = {{2010}},
}

@inproceedings{9754,
  abstract     = {{A model based design approach for improved piezoelectric inertia motors is presented. Three velocityoptimized movement patterns for the driving body have been derived. The influence of the motor parameters and the process of designing an application specific motor with maximum velocity are shown. A simple dynamic model of the piezoelectric actuator is used to calculate the voltage signal for achieving the desired movement pattern. Observed distortions of the optimum pattern, their influence on the motion of the driven body and different methods to reduce them are discussed.}},
  author       = {{Hunstig, Matthias and Hemsel, Tobias and Sextro, Walter}},
  booktitle    = {{ACTUATOR 2010 Conference Proceedings}},
  issn         = {{0924-4247}},
  pages        = {{657--661}},
  title        = {{{Improving the Performance of Piezoelectric Inertia Motors}}},
  year         = {{2010}},
}