@article{34441, abstract = {{The state of the art industrial manufacturing process to produce shafts as counter surfaces for radial shaft seal rings is plunge grinding. This process consists of three major steps. The blank is turned to a slight diameter-oversize followed by the heat treatment and the hard-finishing by plunge grinding. The geometric surface structures of the resulting shafts in general exhibit a stochastic distribution. These surface characteristics contribute to a reliable and stable sealing functionality. And the surface and subsurface hardness generally leads to a higher wear resistance of the shaft. Motivated by economic benefits and in order to achieve a compact production process for at least ten years, turning is investigated as an alternative manufacturing process. However due to the resulting lead structure on the shaft surface and the associated risk of leakage it has not become prevalent yet. In this paper turned shafts of the metastable austenitic steel AISI 347 (1.4550, X6CrNiNb1810) are investigated as alternative material for counter surfaces of radial shaft seal rings and compared to turned shafts of carburized AISI 5115 (1.7131, 16MnCr5). In addition to surfaces dry turned at room-temperature, cryogenic turned AISI 347 counter surfaces are analyzed. By applying cryogenic cooling, the formation of deformation-induced α′-martensite in the surface layer is possible during the turning process. Endurance tests in radial shaft seal ring test rigs are performed and complemented with detailed investigations of microstructure, micro-hardness and surface topography. The results are compared to results of state of the art ground AISI 5115 shafts.}}, author = {{Frölich, D. and Magyar, Balázs and Sauer, B. and Mayer, P. and Kirsch, B. and Aurich, J.C. and Skorupski, R. and Smaga, M. and Beck, T. and Eifler, D.}}, issn = {{0043-1648}}, journal = {{Wear}}, keywords = {{Radial shaft seal ring, Shaft surface, Cryogenic turning, Metastable austenitic steel, Deformation-induced martensite formation}}, pages = {{123--131}}, title = {{{Investigation of wear resistance of dry and cryogenic turned metastable austenitic steel shafts and dry turned and ground carburized steel shafts in the radial shaft seal ring system}}}, doi = {{https://doi.org/10.1016/j.wear.2015.02.004}}, volume = {{328-329}}, year = {{2015}}, } @inbook{30999, abstract = {{Schulisches Wohlbe nden ist als Indikator von Schulqualität vor allem für inklusive Schulen bedeutsam. Als mehrdimensionales Konstrukt wurde es bereits einschlägig operationalisiert (z. B. Hascher 2004), jedoch nicht in Bezug auf den Einsatz bei Schülerinnen und Schülern mit sonderpädagogischem Förderbedarf in inklusiven Schulen der Sekundarstufe I systematisch untersucht. In einem interdisziplinären Team wurde unter Bezug auf eingeführte Instrumente ein Fragebogen entwickelt und bei einer Vollerhebung der Jahrgänge 6 bis 10 an der Laborschule Bielefeld, Versuchsschule des Landes Nordrhein-Westfalen, eingesetzt (N = 292, davon N = 26 mit sonderpädagogischem Förderbedarf). Die beste Modellanpassung im Rahmen einer kon rmatorischen Faktorenanalyse zur Prüfung der Konstruktvalidität erreicht ein Modell mit sechs korrelierten Faktoren. Der Beitrag berichtet psychometrische Kennwerte der Skalen und weitere Ergebnisse, z. B. zur konvergenten Validität.}}, author = {{Kullmann, Harry and Geist, Sabine and Lütje-Klose, Birgit}}, booktitle = {{Inklusion von Schülerinnen und Schülern mit sonderpädagogischem Förderbedarf in Schulleistungserhebungen}}, editor = {{Kuhl, Poldi and Stanat, Petra and Lütje-Klose, Birgit and Gresch, Cornelia and Anand Pant, Hans and Prenzel, Manfred}}, isbn = {{978-3-658-06604-8}}, pages = {{301–333}}, publisher = {{Springer VS}}, title = {{{Erfassung schulischen Wohlbefindens in inklusiven Schulen ‒ Befunde zur Erprobung eines mehrdimensionalen Konstrukts in fünf Jahrgängen der Sekundarstufe I an der Laborschule Bielefeld}}}, doi = {{10.1007/978-3-658-06604-8}}, year = {{2015}}, } @misc{66811, author = {{Pöllmann, Andreas}}, booktitle = {{Ethnic and Racial Studies}}, issn = {{0141-9870}}, number = {{13}}, pages = {{2460--2462}}, publisher = {{Informa UK Limited}}, title = {{{Pensar la mezcla: Un relato intercultural}}}, doi = {{10.1080/01419870.2015.1005646}}, volume = {{38}}, year = {{2015}}, } @book{36384, abstract = {{El presente libro constituye, ante todo, un recurso para los investigadores, los creadores de políticas públicas, y los ciudadanos interesados en el tema. Por lo tanto, su objetivo es dar un panorama general del amplio universo de los datos estadísticos que forman su base empírica, ofrecer algunas interpretaciones y contextualizaciones iniciales y animar a llevar a cabo futuros análisis independientes.}}, author = {{Pöllmann, Andreas and Sánchez Graillet, Olivia}}, publisher = {{Libros UNAM}}, title = {{{Cultura, lectura y deporte: Percepciones, prácticas, aprendizaje y capital intercultural}}}, year = {{2015}}, } @inbook{66827, author = {{Pöllmann, Andreas}}, booktitle = {{Inventario de México en 2015}}, editor = {{Flores, Julia Isabel and Morales Mena, Agustín}}, isbn = {{978-607-02-7752-8}}, publisher = {{Libros UNAM}}, title = {{{Cultura, lectura y deporte: Percepciones, prácticas, aprendizaje y capital intercultural}}}, year = {{2015}}, } @article{66796, abstract = {{Este artículo concibe la ascendencia como un marcador controvertido de “lo británico” y de “lo alemán”. Tomando en consideración tanto la evolución de las leyes de nacionalidad como los datos empíricos del Programa Internacional de Encuestas Sociales (ISSP, 2003), se demuestra que la distinción “clásica” entre naciones cívicas y naciones étnicas tiende a sobrestimar las diferencias entre naciones, mientras que subestima las diferencias intra-nacionales. El hecho de que tanto en Inglaterra como en Alemania los niveles más altos de educación formal estén fuertemente asociados a nociones étnicamente más incluyentes de “legítima pertenencia nacional”, enfatiza el potencial de la educación formal en las sociedades multiculturales contemporáneas.}}, author = {{Pöllmann, Andreas}}, journal = {{Cultura y Representaciones Sociales}}, number = {{18}}, pages = {{9--25}}, publisher = {{Universidad Nacional Autónoma de México}}, title = {{{El papel de la ascendencia en la idea de “lo británico” y de “lo alemán”: Más allá de los mitos en torno a la distinción entre naciones cívicas y étnicas}}}, volume = {{9}}, year = {{2015}}, } @inbook{1124, abstract = {{Finding information about people in the World Wide Web is one of the most common activities of Internet users. It is now impossible to manually analyze all this information and new approaches are needed that are capable of processing the large-scale heterogeneous data in order to extract the pertinent information. The Wikipedia community still puts much effort in manually adding structured data to biographical articles, the so-called {{Persondata}} template. Thanks to this kind of metadata, semantically-enriched information concerning the biographee (e.g. name, date of birth, place of birth) can be extracted and processed by search engines. But it is a rather time-consuming task and users quite often forget to add this template: some biographies contain persondata, others do not. There is considerably less work done on developing approaches to automatically enhance English Wikipedia biographies with persondata and therefore improve the quality of structured user contributions. Within this paper, we describe our method to automatically generate persondata from biographical information in Wikipedia articles.}}, author = {{Geierhos, Michaela}}, booktitle = {{Penser le Lexique-Grammaire}}, editor = {{Kakoyianni-Doa, Fryni}}, isbn = {{9782745325129}}, location = {{Nicosia, Cyprus}}, pages = {{411--420}}, publisher = {{Honoré Champion}}, title = {{{Towards a Local Grammar-based Persondata Generator for Wikipedia Biographies}}}, year = {{2014}}, } @inproceedings{1130, abstract = {{In this paper, we focus on the acronym representation, the concept of abbreviation of major terminology. To this end, we try to find the most efficient method to disambiguate the sense of the acronym. Comparing the various feature types, we found that using single noun (NN) overwhelmingly outperformed noun phrase (NP) base. Moreover, the result also showed that collocation information (CL) was not efficient for enhancing performance considering a huge extra data processing. We expect to apply the open knowledge base Wikipedia to scholarly service to enhance the quality of the local knowledge base and to develop value-added services.}}, author = {{Jeong, Do-Heon and Gim, Jangwon and Jung, Hanmin and Geierhos, Michaela and Bäumer, Frederik Simon}}, booktitle = {{Conference Proceedings of the 9th Asia Pacific International Conference on Information Science and Technology (APIC-IST 2014)}}, issn = {{20930542}}, location = {{Kathmandu, Nepal}}, pages = {{369--371}}, title = {{{Comparative study on disambiguating acronyms in the scientific papers using the open knowledge base}}}, year = {{2014}}, } @inproceedings{1131, author = {{Geierhos, Michaela and Schulze, Sabine}}, booktitle = {{Challenges for Consumer Research and Consumer Policy in Europe}}, location = {{Bonn, Germany}}, pages = {{53}}, title = {{{The same but not the same - Challenges in comparing patient opinions}}}, year = {{2014}}, } @inproceedings{1134, abstract = {{This paper focuses on the first step in combining prescriptive analytics with scenario techniques in order to provide strategicdevelopment after the useof InSciTe, a data prescriptive analytics application. InSciTe supports the improvement of researchers‘ individual performance by recommending new research directions. Standardized influential factors are presented as a foundation for automated scenario modelling such as the prototypical report generation function of InSciTe. Additionally, a use-case is shown which validatesthe potential of the standardized influential factors for raw scenario development.}}, author = {{Weber, Jens and Minhee, Cho and Lee, Mikyoung and Song, Sa-kwang and Geierhos, Michaela and Jung, Hanmin}}, booktitle = {{Proceedings of the First International Workshop on Patent Mining and Its Applications (IPaMin 2014) co-located with Konvens 2014}}, editor = {{Jung, Hanmin and Mandl, Thomas and Womsen-Hacker, Christa and Xu, Shuo}}, issn = {{16130073}}, keywords = {{Standardized Influential Factors, Prescriptive Analytics, Role Model Group, Scenario Technique}}, location = {{Hildesheim, Germany}}, publisher = {{CEUR-WS.org}}, title = {{{System Thinking: Crafting Scenarios for Prescriptive Analytics}}}, volume = {{1292}}, year = {{2014}}, } @inproceedings{1135, abstract = {{In this paper, we describe our system developed for the GErman SenTiment AnaLysis shared Task (GESTALT) for participation in the Maintask 2: Subjective Phrase and Aspect Extraction from Product Reviews. We present a tool, which identifies subjective and aspect phrases in German product reviews. For the recognition of subjective phrases, we pursue a lexicon-based approach. For the extraction of aspect phrases from the reviews, we consider two possible ways: Besides the subjectivity and aspect look-up, we also implemented a method to establish which subjective phrase belongs to which aspect. The system achieves better results for the recognition of aspect phrases than for the subjective identification.}}, author = {{Dollmann, Markus and Geierhos, Michaela}}, booktitle = {{Workshop Proceedings of the 12th Edition of the KONVENS Conference}}, editor = {{Faaß, Gertrud and Ruppenhofer, Josef}}, isbn = {{978-3-934105-47-8}}, keywords = {{corpus linguistics, sentiment analysis}}, location = {{Hildesheim, Germany}}, pages = {{185--191}}, publisher = {{Universitätsverlag Hildesheim}}, title = {{{SentiBA: Lexicon-based Sentiment Analysis on German Product Reviews}}}, year = {{2014}}, } @inproceedings{1137, abstract = {{In this paper, we present a system which makes scientific data available following the linked open data principle using standards like RDF and URI as well as the popular D2R server (D2R) and the customizable D2RQ mapping language. Our scientific data sets include acronym data and expansions, as well as researcher data such as author name, affiliation, coauthors, and abstracts. The system can easily be extended to other records. Regarding this, a domain adaptation to patent mining seems possible. For this reason, obvious similarities and differences are presented here. The data set is collected from several different providers like publishing houses and digital libraries, which follow different standards in data format and structure. Most of them are not supporting semantic web technologies, but the legacy HTML standard. The integration of these large amounts of scientific data into the Semantic Web is challenging and it needs flexible data structures to access this information and interlink them. Based on these data sets, we will be able to derive a general technology trend as well as the individual research domain for each researcher. The goal of our Linked Open Data System for scientific data is to provide access to this data set for other researchers using the Web of Linked Data. Furthermore we implemented an application for visualization, which allows usto explorethe relations between single data sets.}}, author = {{Bäumer, Frederik Simon and Gim, Jangwon and Jeong, Do-Heon and Geierhos, Michaela and Jung, Hanmin}}, booktitle = {{Proceedings of the First International Workshop on Patent Mining and Its Applications (IPaMin 2014) co-located with Konvens 2014}}, editor = {{Jung, Hanmin and Mandl, Thomas and Womsen-Hacker, Christa and Xu, Shuo}}, issn = {{16130073}}, keywords = {{Linked Open Data, Researcher Data, Acronym Data, D2R}}, location = {{Hildesheim, Germany}}, publisher = {{CEUR-WS.org}}, title = {{{Linked Open Data System for Scientific Data Sets}}}, volume = {{1292}}, year = {{2014}}, } @article{20944, abstract = {{Joining metals using electrochemical support (ECUF) is a new process for cold pressure welding sheets and parts. This new process is based on an electrochemical in-line surface treatment followed by incremental pilger rolling. The ECUF process intends to cold pressure weld materials under optimized conditions. Oxide layers on metal surfaces are known to inhibit the formation of cold pressure welds. The in-line electrochemical treatment will be used to remove these surface oxides for specific engineering metals and alloys. Hence, an improved pressure weld formation at lower forces and smaller reduction ratios is expected for the electrochemically treated surfaces. Using a more flexible pressure welding process, the number of applications could be greatly improved. First tests with copper were performed to analyse the efficiency of the proposed electrochemical surface treatments. Two electrochemical treatments, the cathodic oxide-reduction and cyclovoltammetric oxide-reduction, were compared with conventional treatments (degreasing and scratch brushing) regarding their influence on the cold pressure welding process of copper. The weld strength of lap welds has been investigated as well as the necessary reduction threshold to form a weld. It was found that the electrochemical oxide reduction resulted in higher weld strength. The results of scanning electron microscopy (SEM) and energy dispersive analysis of X-rays (EDX) indicate that surface oxides were successfully removed by the electrochemical surface treatments. (C) 2014 Elsevier B.V. All rights reserved.}}, author = {{Ebbert, Christoph and Schmidt, H. C. and Rodman, D. and Nuernberger, F. and Homberg, W. and Maier, H. J. and Grundmeier, Guido}}, issn = {{0924-0136}}, journal = {{JOURNAL OF MATERIALS PROCESSING TECHNOLOGY}}, number = {{10}}, pages = {{2179--2187}}, title = {{{Joining with electrochemical support (ECUF): Cold pressure welding of copper}}}, doi = {{10.1016/j.jmatprotec.2014.04.015}}, volume = {{214}}, year = {{2014}}, } @inbook{23755, author = {{Fechner, Sabine}}, booktitle = {{Forschen, Lehren und Lernen in der Lehrerausbildung. Fachdidaktische Beiträge aus der universitären Praxis}}, editor = {{Baumgardt, Iris}}, pages = {{57--73}}, publisher = {{Schneider Verlag}}, title = {{{Die bilinguale "Forscherwoche" für Oberstufenschülerinnen und -schüler als praxisnahe Möglichkeit für forschendes Lernen in der Lehrerausbildung Chemie}}}, year = {{2014}}, } @inproceedings{8554, author = {{Liebendörfer, Michael and Hochmuth, Reinhard and Kolter, Jana and Schukajlow, Stanislaw}}, booktitle = {{Proceedings of the 38th Conference of the International Group for the Psychology of Mathematics Education an the 36th Conference of the North American Chapter of the Psychology of Mathematics Education}}, editor = {{Nicol, C. and Oesterle, S. and Liljedahl, Peter and Allan, D.}}, pages = {{153}}, publisher = {{PME}}, title = {{{The Mathematical Beliefs and Interest Development of Pre-Service Primary Teachers}}}, volume = {{6}}, year = {{2014}}, } @inproceedings{9868, abstract = {{In order to increase mechanical strength, heat dissipation and ampacity and to decrease failure through fatigue fracture, wedge copper wire bonding is being introduced as a standard interconnection method for mass production. To achieve the same process stability when using copper wire instead of aluminum wire a profound understanding of the bonding process is needed. Due to the higher hardness of copper compared to aluminum wire it is more difficult to approach the surfaces of wire and substrate to a level where van der Waals forces are able to arise between atoms. Also, enough friction energy referred to the total contact area has to be generated to activate the surfaces. Therefore, a friction model is used to simulate the joining process. This model calculates the resulting energy of partial areas in the contact surface and provides information about the adhesion process of each area. The focus here is on the arising of micro joints in the contact area depending on the location in the contact and time. To validate the model, different touchdown forces are used to vary the initial contact areas of wire and substrate. Additionally, a piezoelectric tri-axial force sensor is built up to identify the known phases of pre-deforming, cleaning, adhering and diffusing for the real bonding process to map with the model. Test substrates as DBC and copper plate are used to show the different formations of a wedge bond connection due to hardness and reaction propensity. The experiments were done by using 500 $\mu$m copper wire and a standard V-groove tool.}}, author = {{Althoff, Simon and Neuhaus, Jan and Hemsel, Tobias and Sextro, Walter}}, booktitle = {{Electronic Components and Technology Conference (ECTC), 2014 IEEE 64th}}, keywords = {{adhesion, circuit reliability, deformation, diffusion, fatigue cracks, friction, interconnections, lead bonding, van der Waals forces, Cu, adhering process, adhesion process, ampacity improvement, bond quality improvement, cleaning process, diffusing process, fatigue fracture failure, friction energy, friction model, heat dissipation, mechanical strength, piezoelectric triaxial force sensor, predeforming process, size 500 mum, total contact area, van der Waals forces, wedge copper wire bonding, Bonding, Copper, Finite element analysis, Force, Friction, Substrates, Wires}}, pages = {{1549--1555}}, title = {{{Improving the bond quality of copper wire bonds using a friction model approach}}}, doi = {{10.1109/ECTC.2014.6897500}}, year = {{2014}}, } @inproceedings{9870, abstract = {{Nowadays wire bonding is a widely-used technology for interconnecting chips in the packaging industry. Thereby, it is known that the bond quality massively depends upon the microstructure prevailing in the bond and consequently the materials used as well as the bonding parameters. However the actually used materials such as aluminum and gold are either characterized by comparibly poor conductivity or high costs, respectively. Due to its outstanding properties copper is a more attractive candidate. Still, a thorough investigation on the interrelationship between the material combinations, the processing parameters and the resulting microstructure for copper and aluminum wire bonding was not carried out yet. Depending on the aforementioned factors the microstructural evolution can be completely different during the bonding process. Therefore, this study focuses on the microstructural evolution of heavy copper and heavy aluminum wires bonded on copper substrates. The evolution of the wire microstructure as well as the wire-substrate-interface was investigated by scanning electron microscope in combination with electron backscatter diffraction and microhardness measurements. Various samples were extracted at different points of the bonding process, namely the as-received condition, after touchdown and after completed bonding. The results of the aluminum and copper wires were compared to each other in both longitudinal and transversal direction. It was found, that the two wire materials were completely different in the as-received condition regarding the grain size, the grain morphology, the texture and the microhardness. After touchdown the microstructure did not show significant changes in both materials, yet a strain-hardening was observed in the copper wire resulting from the touchdown force. When the bonding process was completed a different microstructure could be observed in both the wire as well as the layer for the materials investigated. Furthermore, a destinctive increase in the wire hardness could be found in case of copper, which was not observed for the aluminum wire. The ramifications between the two wire materials presented in this work will be discussed with the objective of optimizing the quality of the bonds.}}, author = {{Eacock , Florian and Schaper, Mirko and Althoff, Simon and Unger, Andreas and Eichwald, Paul and Hengsbach, Florian and Zinn, Carolin and Holzweissig, Martin Joachim and Guth, Karsten}}, booktitle = {{Proceedings of the 47th International Symposium on Microelectronics}}, keywords = {{Bonding, Copper, Microstructure evolution}}, title = {{{Microstructural investigations of aluminum and copper wire bonds}}}, doi = {{10.4071/isom-THP32}}, year = {{2014}}, } @article{9874, author = {{Hemsel, Tobias and Bornmann, Peter and Morita, Takeshi and Sondermann-Wölke, Christoph and Sextro, Walter}}, issn = {{0939-1533}}, journal = {{Archive of Applied Mechanics}}, keywords = {{Reliability, Ultrasonic power transducers, FMEA}}, pages = {{1--7}}, publisher = {{Springer Berlin Heidelberg}}, title = {{{Reliability analysis of ultrasonic power transducers}}}, doi = {{10.1007/s00419-014-0965-4}}, year = {{2014}}, } @article{9878, abstract = {{(K,Na)NbO3 ceramics have attracted much attention as lead-free piezoelectric materials with high piezoelectric properties. High-quality (K,Na)NbO3 ceramics can be sintered using KNbO3 and NaNbO3 powders synthesized by a hydrothermal method. In this study, to enhance the quality factor of the ceramics, high-power ultrasonic irradiation was employed during the hydrothermal method, which led to a reduction in the particle size of the resultant powders.}}, author = {{Isobe, G. and Maeda, Takafumi and Bornmann, Peter and Hemsel, Tobias and Morita, Takeshi}}, issn = {{0885-3010}}, journal = {{Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on}}, keywords = {{Q-factor, ceramics, crystal growth from solution, particle size, piezoelectric materials, potassium compounds, powders, sintering, sodium compounds, ultrasonic effects, (K0.48Na0.52)NbO3, KNbO3 powders, NaNbO3 powders, high-power ultrasonic irradiation, lead-free piezoelectric materials, lead-free piezoelectric powders, particle size reduction, piezoelectric properties, quality factor, sintered (K0.48Na0.52)NbO3 ceramics, sintering, ultrasonic-assisted hydrothermal method, Acoustics, Ceramics, Lead, Piezoelectric materials, Powders, Radiation effects, Transducers}}, number = {{2}}, pages = {{225--230}}, title = {{{Synthesis of lead-free piezoelectric powders by ultrasonic-assisted hydrothermal method and properties of sintered (K0.48Na0.52)NBO3 ceramics}}}, doi = {{10.1109/TUFFC.2014.6722608}}, volume = {{61}}, year = {{2014}}, } @inproceedings{9880, abstract = {{With the paradigm shift towards prognostic and health management (PHM) of machinery, there is need for reliable PHM methodologies with narrow error bounds to allow maintenance engineers take decisive maintenance actions based on the prognostic results. Prognostics is mainly concerned with the estimation of the remaining useful life (RUL) or time to failure (TTF). The accuracy of PHM methods is usually a function of the features extracted from the raw data obtained from sensors. In cases where the extracted features do not display clear degradation trends, for instance highly loaded bearings, the accuracy of the state of the art PHM methods is significantly affected. The data which lacks clear degradation trend is referred to as non-trending data. This study presents a method for extracting degradation trends from non-trending condition monitoring data for RUL estimation. The raw signals are first filtered using a discrete wavelet transform (DWT) denoising filter to remove noise from the acquired signals. Time domain, frequency domain and time-frequency domain features are then extracted from the filtered signals. An autoregressive model is then applied to the extracted features to identify the degradation trends. Features representing the maximum health information are then selected based on a performance evaluation criteria using extreme learning machine (ELM) algorithm. The selected features can then be used as inputs in a prognostic algorithm. The feasibility of the method is demonstrated using experimental bearing vibration data. The performance of the method is evaluated on the accuracy of RUL estimation and the results show that the method can be used to accurately estimate RUL with a maximum error of 10\%.}}, author = {{Kimotho, James Kuria and Sextro, Walter}}, booktitle = {{Proceedings of the Second European Conference of the Prognostics and Health Management Society 2014}}, keywords = {{autoregressive model ELM feature extraction feature selection non-trending Remaining useful Life}}, title = {{{An approach for feature extraction and selection from non-trending data for machinery prognosis}}}, volume = {{5}}, year = {{2014}}, }