@article{HuckPoghossianWagneretal.2012,
  author    = {Huck, Christina and Poghossian, Arshak and Wagner, Patrick and Sch{\"o}ning, Michael Josef},
  title     = {Combined amperometric/field-effect sensor for the detection of dissolved hydrogen},
  series = {Sensors and actuators B: Chemical},
  volume    = {187},
  journal   = {Sensors and actuators B: Chemical},
  publisher = {Elsevier},
  address   = {Amsterdam},
  issn      = {0925-4005},
  doi       = {10.1016/j.snb.2012.10.050},
  pages     = {168 -- 173},
  year      = {2012},
  abstract  = {Real-time and reliable monitoring of the biogas process is crucial for a stable and efficient operation of biogas production in order to avoid digester breakdowns. The concentration of dissolved hydrogen (H₂) represents one of the key parameters for biogas process control. In this work, a one-chip integrated combined amperometric/field-effect sensor for monitoring the dissolved H₂ concentration has been developed for biogas applications. The combination of two different transducer principles might allow a more accurate and reliable measurement of dissolved H₂ as an early warning indicator of digester failures. The feasibility of the approach has been demonstrated by simultaneous amperometric/field-effect measurements of dissolved H₂ concentrations in electrolyte solutions. Both, the amperometric and the field-effect transducer show a linear response behaviour in the H₂ concentration range from 0.1 to 3\% (v/v) with a slope of 198.4 ± 13.7 nA/\% (v/v) and 14.9 ± 0.5 mV/\% (v/v), respectively.},
  language  = {en}
}
@article{Weigand2012,
  author    = {Weigand, Christoph},
  title     = {Statistical Tests Based on Reliability and Precision},
  series = {Economic Quality Control : EQC ; international journal for quality and reliability},
  volume    = {27},
  journal   = {Economic Quality Control : EQC ; international journal for quality and reliability},
  number    = {1},
  publisher = {De Gruyter},
  address   = {Berlin},
  issn      = {1869-6147},
  doi       = {10.1515/eqc-2012-0002},
  pages     = {43 -- 64},
  year      = {2012},
  abstract  = {The construction of a statistical test is investigated which is based only on "reliability" and "precision" as quality criteria. The reliability of a statistical test is quantifiedin a straightforward way by the probability that the decision of the test is correct. However, the quantification of the precision of a statistical test is not at all evident. Thereforethe paper presents and discusses several approaches. Moreover the distinction of "nullhypothesis" and "alternative hypothesis" is not necessary any longer.},
  language  = {en}
}
@article{FateriHoetterGebhardt2012,
  author    = {Fateri, Miranda and H{\"o}tter, Jan-Steffen and Gebhardt, Andreas},
  title     = {Experimental and Theoretical Investigation of Buckling Deformation of Fabricated Objects by Selective Laser Melting},
  series = {Physics Procedia},
  volume    = {39},
  journal   = {Physics Procedia},
  publisher = {Elsevier},
  address   = {Amsterdam},
  issn      = {1875-3892},
  doi       = {10.1016/j.phpro.2012.10.062},
  pages     = {464 -- 470},
  year      = {2012},
  abstract  = {Although Selective Laser Melting (SLM) process is an innovative manufacturing method, there are challenges such as inferior mechanical properties of fabricated objects. Regarding this, buckling deformation which is caused by thermal stress is one of the undesired mechanical properties which must be alleviated. As buckling deformation is more observable in hard to process materials, silver is selected to be studied theoretically and experimentally for this paper. Different scanning strategies are utilized and a Finite Element Method (FEM) is applied to calculate the temperature gradient in order to determine its effect on the buckling deformation of the objects from experiments.},
  language  = {en}
}
@article{HasanKeilStaatetal.2012,
  author    = {Hasan, Istabrak and Keil, Ludger and Staat, Manfred and Wahl, Gerhard and Bourauel, Christoph},
  title     = {Determination of the frictional coefficient of the implant-antler interface : experimental approach},
  series = {Biomedical Engineering / Biomedizinische Technik},
  volume    = {57},
  journal   = {Biomedical Engineering / Biomedizinische Technik},
  number    = {5},
  publisher = {De Gruyter},
  address   = {Berlin},
  issn      = {1862-278X},
  pages     = {359 -- 363},
  year      = {2012},
  abstract  = {The similar bone structure of reindeer antler to human bone permits studying the osseointegration of dental implants in the jawbone. As the friction is one of the major factors that have a significant influence on the initial stability of immediately loaded dental implants, it is essential to define the frictional coefficient of the implant-antler interface. In this study, the kinetic frictional forces at the implant-antler interface were measured experimentally using an optomechanical setup and a stepping motor controller under different axial loads and sliding velocities. The corresponding mean values of the static and kinetic frictional coefficients were within the range of 0.5-0.7 and 0.3-0.5, respectively. An increase in the frictional forces with increasing applied axial loads was registered. The measurements showed an evidence of a decrease in the magnitude of the frictional coefficient with increasing sliding velocity. The results of this study provide a considerable assessment to clarify the suitable frictional coefficient to be used in the finite element contact analysis of antler specimens.},
  language  = {en}
}
@book{WosnitzaHilgers2012,
  author    = {Wosnitza, Franz and Hilgers, Hans Gerd},
  title     = {Energieeffizienz und Energiemanagement : ein {\"U}berblick heutiger M{\"o}glichkeiten und Notwendigkeiten},
  publisher = {Springer Spektrum},
  address   = {Wiesbaden},
  isbn      = {978-3-8348-1941-3},
  pages     = {XVII, 548 S. : Ill., graph. Darst.},
  year      = {2012},
  language  = {en}
}
@book{JanserHavermann2012,
  author    = {Janser, Frank and Havermann, Marc},
  title     = {Inkompressible Str{\"o}mungen},
  publisher = {Mainz},
  address   = {Aachen},
  isbn      = {978-3-86130-446-3},
  pages     = {189 S. : Ill., graph. Darst.},
  year      = {2012},
  language  = {en}
}
@inproceedings{SchoppNachtrodtHeuermannetal.2012,
  author    = {Schopp, Christoph and Nachtrodt, Frederik and Heuermann, Holger and Scherer, Ulrich W. and Mostacci, Domiziano and Finger, Torsten and Tietsch, Wolfgang},
  title     = {A novel 2.45 GHz/200 W Microwave Plasma Jet for High Temperature Applications above 3600 K},
  series = {Journal of Physics : Conference Series},
  volume    = {406},
  booktitle = {Journal of Physics : Conference Series},
  number    = {012029},
  issn      = {1742-6596},
  pages     = {5},
  year      = {2012},
  language  = {en}
}
@inproceedings{NixFrotscherStaat2012,
  author    = {Nix, Yvonne and Frotscher, Ralf and Staat, Manfred},
  title     = {Implementation of the edge-based smoothed extended finite element method},
  series = {Proceedings 6th European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS 2012) Vienna, Austria, September 10-14, 2012},
  booktitle = {Proceedings 6th European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS 2012) Vienna, Austria, September 10-14, 2012},
  editor    = {Eberhardsteiner, J.},
  year      = {2012},
  language  = {en}
}
@inproceedings{FrotscherRaatschenStaat2012,
  author    = {Frotscher, Ralf and Raatschen, Hans-J{\"u}rgen and Staat, Manfred},
  title     = {Application of an edge-based smoothed finite element method on geometrically non-linear plates of non-linear material},
  series = {Proceedings European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS 2012)},
  booktitle = {Proceedings European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS 2012)},
  editor    = {Eberhardsteiner, J.},
  year      = {2012},
  language  = {en}
}
@inproceedings{DuongNguyenStaat2012,
  author    = {Duong, Minh Tuan and Nguyen, Nhu Huynh and Staat, Manfred},
  title     = {Numerical stability enhancement of modeling hyperelastic materials},
  series = {Proceedings European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS 2012)},
  booktitle = {Proceedings European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS 2012)},
  editor    = {Eberhardsteiner, J.},
  year      = {2012},
  language  = {en}
}
@inproceedings{TranStaat2012,
  author    = {Tran, Thanh Ngoc and Staat, Manfred},
  title     = {A primal-dual shakedown analysis of 3D structures using the face-based smoothed finite element method},
  series = {Proceedings European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS 2012)},
  booktitle = {Proceedings European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS 2012)},
  editor    = {Eberhardsteiner, J.},
  year      = {2012},
  language  = {en}
}
@inproceedings{PhamNguyenStaat2012,
  author    = {Pham, Phu Tinh and Nguyen, Thanh Ngoc and Staat, Manfred},
  title     = {FEM based shakedown analysis of hardening structures},
  series = {Proceedings International Conference on Advances in Computational Mechanics (ACOME)},
  booktitle = {Proceedings International Conference on Advances in Computational Mechanics (ACOME)},
  pages     = {870 -- 882},
  year      = {2012},
  language  = {en}
}
@inproceedings{FunkeBoernerKeinzetal.2012,
  author    = {Funke, Harald and B{\"o}rner, Sebastian and Keinz, Jan and Kusterer, K. and Kroninger, D. and Kitajima, J. and Kazari, M. and Horikama, A.},
  title     = {Numerical and experimental characterization of low NOx Micromix combustion principle for industrial hydrogen gas turbine applications},
  series = {Proceedings of ASME Turbo Expo 2012},
  booktitle = {Proceedings of ASME Turbo Expo 2012},
  pages     = {11},
  year      = {2012},
  language  = {en}
}
@inproceedings{FunkeBoernerKeinzetal.2012,
  author    = {Funke, Harald and B{\"o}rner, Sebastian and Keinz, Jan and Hendrick, P. and Recker, E.},
  title     = {Low NOx Hydrogen combustion chamber for industrial gas turbine applications", 14th International Symposium on Transport Phenomena and Dynamics of Rotating Machinery},
  series = {ISROMAC-14 : the Forteenth International Symposium on Transport Phenomena and Dynamics of Rotating Machinery ; Honolulu, Hawaii, February 27 - March 02nd, 2012},
  booktitle = {ISROMAC-14 : the Forteenth International Symposium on Transport Phenomena and Dynamics of Rotating Machinery ; Honolulu, Hawaii, February 27 - March 02nd, 2012},
  year      = {2012},
  language  = {en}
}
@article{NomdedeuWillenSchiefferetal.2012,
  author    = {Nomdedeu, Mar Monsonis and Willen, Christine and Schieffer, Andre and Arndt, Hartmut},
  title     = {Temperature-dependent ranges of coexistence in a model of a two-prey-one-predator microbial food web},
  series = {Marine Biology},
  volume    = {159},
  journal   = {Marine Biology},
  number    = {11},
  publisher = {Springer},
  address   = {Berlin},
  issn      = {1432-1793},
  doi       = {10.1007/s00227-012-1966-x},
  pages     = {2423 -- 2430},
  year      = {2012},
  abstract  = {The objective of our study was to analyze the effects of temperature on the population dynamics of a three-species food web consisting of two prey bacteria (Pedobacter sp. and Acinetobacter johnsonii) and a protozoan predator (Tetrahymena pyriformis) as model organisms. We assessed the effects of temperature on the growth rates of all three species with the objective of developing a model with four differential equations based on the experimental data. The following hypotheses were tested at a theoretical level: Firstly, temperature changes can affect the dynamic behavior of a system by temperature-dependent parameters and interactions and secondly, food web response to temperature cannot be derived from the single species temperature response. The main outcome of the study is that temperature changes affect the parameter range where coexistence is possible within all three species. This has significant consequences on our ideas regarding the evaluation of effects of global warming.},
  language  = {en}
}
@phdthesis{Schieffer2012,
  author    = {Schieffer, Andre},
  title     = {Studies on diversity and coexistence in an experimental microbial community},
  pages     = {76 Bl. : Ill.},
  year      = {2012},
  abstract  = {Biodiversity and the coexistence of species have puzzled and fascinated biologists since decades and is a hotspot in todays' natural sciences. Preserving this biodiversity is a great challenge as habitats and environments underlying tremendous changes like climate change and the loss of natural habitats, which are mainly due to anthropogenic influences. The coexistence of numerous species even in homogeneous environments is a stunning feature of natural communities and has been summarized under the term 'paradox of plankton'. Up to now, there are several mechanisms discussed, which may contribute to local and global diversity of organisms. Several interspecific trade offs have been identified maintaining the coexistence of species like their abilities regarding competition and predator avoidance, their capability to disperse in space and time, and their ability to exploit variable resources. Further, micro-evolutionary dynamics supporting the coexistence of species have been added to our knowledge, and deriving from theoretical deterministic models, non-linear dynamics which describe the temporal fluctuation of abundances of organisms. Whereas competition and predation seem to be clue structural elements within interacting organisms, the intrinsic dynamic behavior - by means of temporal changes in abundance - plays an important role regarding coexistence within a community. The present work sheds light on different factors affecting the coexistence of species using experimental microbial model systems consisting of a bacterivorous ciliate as the predator and two bacteria strains as prey organism. Additionally, another experimental setup consisting of two up to five bacteria species competing for one limiting resource was investigated. Highly controllable chemostat systems were established to exclude extrinsic disturbances. According to theoretical analyses I was able to show - experimentally and theoretically - that phenotypic plasticity of one species within a microbial one-predator-two-prey food web enlarges the range of possible coexistence of all species under different dynamic conditions, compared to a food web without phenotypic plasticity. This was accompanied by non-linear (chaotic) population dynamics within all experimental systems showing phenotypic plasticity. The experiments on the interplay of competition, predation and invasion showed that all aspects have an influence on species coexistence. Under undisturbed controlled conditions all aspects were analyzed in detail and in combination. Populations showed oscillations which were shown by quasi-chaotic attractors in phase space diagrams. Competition experiments with two up to five bacteria species competing for one limiting resource showed that all organisms were able to coexist which was mediated by species oscillations entering a regime of chaos. Besides that fact it was found, that the productivity (biomass) as well as the total cell numbers - under the same nutrition supply - increased by an increasing number of species in the experimental systems. Up to now, the occurrence of non-linear dynamics in well controlled experimental studies has been recognized several times and this phenomenon seemed to be more common in natural systems than generally assumed.},
  language  = {en}
}
@article{Alexopoulos2012,
  author    = {Alexopoulos, Spiros},
  title     = {Biogas systems: basics, biogas multifunction, principle of fermentation and hybrid application with a solar tower for the treatment of waste animal manure},
  series = {Journal of Engineering Science and Technology Review},
  volume    = {5},
  journal   = {Journal of Engineering Science and Technology Review},
  number    = {4},
  issn      = {1791-2377},
  pages     = {48 -- 55},
  year      = {2012},
  abstract  = {Two of the main environmental problems of today's society are the continuously increasing production of organic wastes as well as the increase of carbon dioxide in the atmosphere and the related green house effect. A way to solve these problems is the production of biogas. Biogas is a combustible gas consisting of methane, carbon dioxide and small amounts of other gases and trace elements. Production of biogas through anaerobic digestion of animal manure and slurries as well as of a wide range of digestible organic wastes and agricultural residues, converts these substrates into electricity and heat and offers a natural fertiliser for agriculture. The microbiological process of decomposition of organic matter, in the absence of oxygen takes place in reactors, called digesters. Biogas can be used as a fuel in a gas turbine or burner and can be used in a hybrid solar tower system offering a solution for waste treatment of agricultural and animal residues. A solar tower system consists of a heliostat field, which concentrates direct solar irradiation on an open volumetric central receiver. The receiver heats up ambient air to temperatures of around 700°C. The hot air's heat energy is transferred to a steam Rankine cycle in a heat recovery steam generator (HRSG). The steam drives a steam turbine, which in turn drives a generator for producing electricity. In order to increase the operational hours of a solar tower power plant, a heat storage system and/ or hybridization may be considered. The advantage of solar-fossil hybrid power plants, compared to solar-only systems, lies in low additional investment costs due to an adaptable solar share and reduced technical and economical risks. On sunny days the hybrid system operates in a solar-only mode with the central receiver and on cloudy days and at night with the gas turbine only. As an alternative to methane gas, environmentally neutral biogas can be used for operating the gas turbine. Hence, the hybrid system is operated to 100\% from renewable energy sources},
  language  = {en}
}
@inproceedings{StreunAlKaddoumParletal.2012,
  author    = {Streun, M. and Al-Kaddoum, R. and Parl, C. and Pietrzyk, U. and Ziemons, Karl and Waasen, S. van},
  title     = {Simulation studies of optical photons in monolithic block scintillators},
  series = {2011 IEEE Nuclear Science Symposium Conference Record (NSS/MIC)},
  booktitle = {2011 IEEE Nuclear Science Symposium Conference Record (NSS/MIC)},
  publisher = {IEEE},
  address   = {New York},
  isbn      = {978-1-4673-0120-6 (electronic ISBN)},
  doi       = {10.1109/NSSMIC.2011.6154621},
  pages     = {1380 -- 1382},
  year      = {2012},
  abstract  = {The interest in PET detectors with monolithic block scintillators is growing. In order to obtain high spatial resolutions dedicated positioning algorithms are required. But even an ideal algorithm can only deliver information which is provided by the detector. In this simulation study we investigated the light distribution on one surface of cuboid LSO scintillators of different size. Scintillators with a large aspect ratio (small footprint and large height) showed significant position information only for a minimum interaction depth of the gamma particle. The results allow a quantitative estimate for a useful aspect ratio.},
  language  = {en}
}
@inproceedings{FrotscherRaatschenStaat2012,
  author    = {Frotscher, Ralf and Raatschen, Hans-J{\"u}rgen and Staat, Manfred},
  title     = {Effectiveness of the edge-based smoothed finite element method applied to soft biological tissues},
  series = {ESMC-2012 - 8th European Solid Mechanics Conference, Graz, Austria, July 9-13, 2012},
  booktitle = {ESMC-2012 - 8th European Solid Mechanics Conference, Graz, Austria, July 9-13, 2012},
  editor    = {Holzapfel, Gerhard A.},
  publisher = {Verlag d. Technischen Universit{\"a}t Graz},
  address   = {Graz},
  isbn      = {978-3-85125-223-1},
  year      = {2012},
  language  = {en}
}
@inproceedings{DuongNguyenStaat2012,
  author    = {Duong, Minh Tuan and Nguyen, Nhu Hunyh and Staat, Manfred},
  title     = {Finite Element Implementation of a 3D Fung-type Model},
  series = {ESMC-2012 - 8th European Solid Mechanics Conference, Graz, Austria, July 9-13, 2012},
  booktitle = {ESMC-2012 - 8th European Solid Mechanics Conference, Graz, Austria, July 9-13, 2012},
  publisher = {Verlag d. Technischen Universit{\"a}t Graz},
  address   = {Graz},
  isbn      = {978-3-85125-223-1},
  year      = {2012},
  language  = {en}
}
@inproceedings{EngelsSchnabel2012,
  author    = {Engels, Elmar and Schnabel, Holger},
  title     = {Rapid-control-prototyping of industrial drives for the sercos automation bus},
  series = {13th International Workshop on Mechatronics (MECATRONICS), 2012 9th France-Japan \& 7th Europe-Asia Congress on and Research and Education in Mechatronics (REM)},
  booktitle = {13th International Workshop on Mechatronics (MECATRONICS), 2012 9th France-Japan \& 7th Europe-Asia Congress on and Research and Education in Mechatronics (REM)},
  isbn      = {978-1-4673-4771-6},
  pages     = {177 -- 181},
  year      = {2012},
  abstract  = {This article describes the functionality of a MATLAB® library that can be used to develop motion-logic applications in MATLAB programming language for industrial drive and control systems using the well known sercos automation bus. Therewith MATLAB's functionality is extended to designing automation applications from single axis machines up to multi-kinematic robots.},
  language  = {en}
}
@article{KirsteinMuellerWaleckiMingersetal.2012,
  author    = {Kirstein, Simon and M{\"u}ller, Karsten and Walecki-Mingers, Mark and Deserno, Thomas M.},
  title     = {Robust adaptive flow line detection in sewer pipes},
  series = {Automation in construction},
  journal   = {Automation in construction},
  number    = {21},
  publisher = {Elsevier},
  address   = {Amsterdam},
  issn      = {1872-7891 (E-Journal) ; 0926-5805 (Print)},
  doi       = {10.1016/j.autcon.2011.05.009},
  pages     = {24 -- 31},
  year      = {2012},
  abstract  = {As part of a novel approach to automatic sewer inspection, this paper presents a robust algorithm for automatic flow line detection. A large image repository is obtained from about 50,000 m sewers to represent the high variability of real world sewer systems. Automatic image processing combines Canny edge detection, Hough transform for straight lines and cost minimization using Dijkstra's shortest path algorithm. Assuming that flow lines are mostly smoothly connected horizontal structures, piecewise flow line delineation is reduced to a process of selecting adjacent line candidates. Costs are derived from the gap between adjacent candidates and their reliability. A single parameter α enables simple control of the algorithm. The detected flow line may precisely follow the segmented edges (α = 0.0) or minimize gaps at joints (α = 1.0). Both, manual and ground truth-based analysis indicate that α = 0.8 is optimal and independent of the sewer's material. The algorithm forms an essential step to further automation of sewer inspection.},
  language  = {en}
}
@inproceedings{GanegedaraAlahakoonMashfordetal.2012,
  author    = {Ganegedara, H. and Alahakoon, D. and Mashford, J. and Paplinski, A. and M{\"u}ller, Karsten and Deserno, T. M.},
  title     = {Self organising map based region of interest labelling for automated defect identification in large sewer pipe image collections},
  series = {The 2012 International Joint Conference on Neural Networks (IJCNN) : 10 - 15 June 2012, Brisbane, Australia ; [part of the] 2012 IEEE World Congress on Computational Intelligence (IEEE-WCCI 2012)},
  booktitle = {The 2012 International Joint Conference on Neural Networks (IJCNN) : 10 - 15 June 2012, Brisbane, Australia ; [part of the] 2012 IEEE World Congress on Computational Intelligence (IEEE-WCCI 2012)},
  publisher = {IEEE},
  address   = {Piscataway, NJ},
  organization    = {IEEE Computational Intelligence Society (IEEE-CIS)},
  isbn      = {978-1-4673-1490-9},
  pages     = {8 S.},
  year      = {2012},
  language  = {en}
}
@inproceedings{AlexopoulosKluczkaVaessenetal.2012,
  author    = {Alexopoulos, Spiros and Kluczka, Sven and Vaeßen, Christiane and Roeb, M. and Neises, M.},
  title     = {Scenario development for efficient methanol production using CO2 and solar energy},
  series = {Eurosun 2012 : Solar energy for a brighter future : conference proceedings : Rijeka, 18.-22.09.2012},
  booktitle = {Eurosun 2012 : Solar energy for a brighter future : conference proceedings : Rijeka, 18.-22.09.2012},
  address   = {Rijeka},
  pages     = {ID 99},
  year      = {2012},
  language  = {en}
}
@inproceedings{SauerbornKlimekHoffschmidtetal.2012,
  author    = {Sauerborn, Markus and Klimek, J. and Hoffschmidt, Bernhard and Essen, H. and Sieger, S. and Biegel, G. and G{\"o}ttsche, Joachim and Hilger, Patrick},
  title     = {Eurosun 2012 : radar technology for heliostat posititon control},
  series = {Eurosun 2012 : Solar energy for a brighter future : conference proceedings : Rijeka, 18.-22.09.2012},
  booktitle = {Eurosun 2012 : Solar energy for a brighter future : conference proceedings : Rijeka, 18.-22.09.2012},
  address   = {Rijeka},
  pages     = {ID 80},
  year      = {2012},
  language  = {en}
}
@article{FerreinMeyer2012,
  author    = {Ferrein, Alexander and Meyer, Thomas},
  title     = {A Brief Overview of Artificial Intelligence in South Africa},
  series = {AI Magazine},
  volume    = {33},
  journal   = {AI Magazine},
  number    = {1},
  publisher = {AAAI},
  address   = {Menlo Park},
  issn      = {0738-4602},
  doi       = {10.1609/aimag.v33i1.2357},
  pages     = {99 -- 101},
  year      = {2012},
  abstract  = {South Africa in recent years is the establishment of a number of research hubs involved in AI activities ranging from mobile robotics and computational intelligence, to knowledge representation and reasoning, and human language technologies. In this survey we take the reader through a quick tour of the research being conducted at these hubs, and touch on an initiative to maintain and extend the current level of interest in AI research in the country.},
  language  = {en}
}
@inproceedings{FerreinKallweitLautermann2012,
  author    = {Ferrein, Alexander and Kallweit, Stephan and Lautermann, Mark},
  title     = {Towards an autonomous pilot system for a tunnel boring machine},
  series = {5th Robotics and Mechatronics Conference of South Africa (ROBMECH) : 26 - 27 November 2012 ; CSIR International Conference Centre Gauteng South Africa},
  booktitle = {5th Robotics and Mechatronics Conference of South Africa (ROBMECH) : 26 - 27 November 2012 ; CSIR International Conference Centre Gauteng South Africa},
  publisher = {IEEE},
  address   = {Piscataway, NJ},
  isbn      = {978-1-4673-5183-6},
  year      = {2012},
  language  = {en}
}
@incollection{HoffschmidtAlexopoulosGoettscheetal.2012,
  author    = {Hoffschmidt, Bernhard and Alexopoulos, Spiros and G{\"o}ttsche, Joachim and Sauerborn, Markus},
  title     = {High concentration solar collectors},
  series = {Comprehensive renewable energy / ed. Ali Sayigh. Vol. 3: Solar thermal systems: components and applications},
  volume    = {3},
  booktitle = {Comprehensive renewable energy / ed. Ali Sayigh. Vol. 3: Solar thermal systems: components and applications},
  publisher = {Elsevier},
  address   = {Amsterdam},
  isbn      = {978-0-08-087873-7},
  doi       = {10.1016/B978-0-08-087872-0.00306-1},
  pages     = {165 -- 209},
  year      = {2012},
  abstract  = {Solar thermal concentrated power is an emerging technology that provides clean electricity for the growing energy market. To the solar thermal concentrated power plant systems belong the parabolic trough, the Fresnel collector, the solar dish, and the central receiver system. For high-concentration solar collector systems, optical and thermal analysis is essential. There exist a number of measurement techniques and systems for the optical and thermal characterization of the efficiency of solar thermal concentrated systems. For each system, structure, components, and specific characteristics types are described. The chapter presents additionally an outline for the calculation of system performance and operation and maintenance topics. One main focus is set to the models of components and their construction details as well as different types on the market. In the later part of this chapter, different criteria for the choice of technology are analyzed in detail.},
  language  = {en}
}
@incollection{HoffschmidtAlexopoulosRauetal.2012,
  author    = {Hoffschmidt, Bernhard and Alexopoulos, Spiros and Rau, Christoph and Sattler, Johannes, Christoph and Anthrakidis, Anette and Teixeira Boura, Cristiano Jos{\´e} and O'Connor, P. and Hilger, Patrick},
  title     = {Concentrating solar power},
  series = {Comprehensive renewable energy / ed. Ali Sayigh. Vol. 3: Solar thermal systems: components and applications},
  volume    = {3},
  booktitle = {Comprehensive renewable energy / ed. Ali Sayigh. Vol. 3: Solar thermal systems: components and applications},
  publisher = {Elsevier},
  address   = {Amsterdam},
  isbn      = {978-0-08-087872-0},
  doi       = {10.1016/B978-0-08-087872-0.00319-X},
  pages     = {595 -- 636},
  year      = {2012},
  language  = {en}
}
@inproceedings{BaumannTeixeiraBouraEcksteinetal.2012,
  author    = {Baumann, Torsten and Teixeira Boura, Cristiano Jos{\´e} and Eckstein, Julian and Dabrowski, Jan and G{\"o}ttsche, Joachim and Hoffschmidt, Bernhard and Schmitz, Stefan and Zunft, Stefan},
  title     = {Properties of bulk materials for high-temperature air-sand heat exchangers},
  series = {30th ISES Biennial Solar World Congress 2011 : Kassel, Germany, 28 August - 2 September 2011. Vol. 2},
  booktitle = {30th ISES Biennial Solar World Congress 2011 : Kassel, Germany, 28 August - 2 September 2011. Vol. 2},
  publisher = {Curran},
  address   = {Red Hook, NY},
  organization    = {International Solar Energy Society},
  isbn      = {978-1-61839-364-7},
  pages     = {1270 -- 1278},
  year      = {2012},
  language  = {en}
}
@inproceedings{SauerbornHoffschmidtTelleetal.2012,
  author    = {Sauerborn, Markus and Hoffschmidt, Bernhard and Telle, R. and Wagner, M.},
  title     = {Heatable optical analyse system for high temperature absorbers},
  series = {30th ISES Biennial Solar World Congress 2011 : : Kassel, Germany, 28 August - 2 September 2011. Vol. 5},
  booktitle = {30th ISES Biennial Solar World Congress 2011 : : Kassel, Germany, 28 August - 2 September 2011. Vol. 5},
  publisher = {Curran},
  address   = {Red Hook, NY},
  organization    = {International Solar Energy Society},
  isbn      = {978-1-61839-364-7},
  pages     = {3852 -- 3860},
  year      = {2012},
  language  = {en}
}
@inproceedings{FrickeZiolkoAnthrakidisetal.2012,
  author    = {Fricke, Barbara and Ziolko, C. and Anthrakidis, Anette and Alexopoulos, Spiros and Hoffschmidt, Bernhard and Giese, F. and Dillig, M.},
  title     = {InnoSol - environmental aspects of the open volumetric receiver technology},
  series = {30th ISES Biennial Solar World Congress 2011 : : Kassel, Germany, 28 August - 2 September 2011. Vol. 5},
  booktitle = {30th ISES Biennial Solar World Congress 2011 : : Kassel, Germany, 28 August - 2 September 2011. Vol. 5},
  publisher = {Curran},
  address   = {Red Hook, NY},
  organization    = {International Solar Energy Society},
  pages     = {3895 -- 3900},
  year      = {2012},
  language  = {en}
}
@inproceedings{AlexopoulosHoffschmidtRauetal.2012,
  author    = {Alexopoulos, Spiros and Hoffschmidt, Bernhard and Rau, Christoph and Sattler, Johannes, Christoph},
  title     = {Simulation of hybrid solar tower power plants},
  series = {30th ISES Biennial Solar World Congress 2011 : Kassel, Germany, 28 August - 2 September 2011. Vol. 5},
  booktitle = {30th ISES Biennial Solar World Congress 2011 : Kassel, Germany, 28 August - 2 September 2011. Vol. 5},
  publisher = {Curran},
  address   = {Red Hook, NY},
  organization    = {International Solar Energy Society},
  pages     = {4044 -- 4050},
  year      = {2012},
  language  = {en}
}
@inproceedings{AlexopoulosRauHoffschmidtetal.2012,
  author    = {Alexopoulos, Spiros and Rau, Christoph and Hoffschmidt, Bernhard and Breitbach, Gerd and Latzke, Markus},
  title     = {Modelling and validation of a transient heat recovery steam generator of the solar tower power plant Juelich},
  series = {Eurosun 2012 : Solar energy for a brighter future : conference proceedings : Rijeka, 18.-22.09.2012},
  booktitle = {Eurosun 2012 : Solar energy for a brighter future : conference proceedings : Rijeka, 18.-22.09.2012},
  address   = {Rijeka},
  pages     = {ID 97},
  year      = {2012},
  language  = {en}
}
@inproceedings{SauerbornArshadiRohrmoser2012,
  author    = {Sauerborn, Markus and Arshadi, S. and Rohrmoser, R.},
  title     = {Influence of clouds and aerosols to the haze of the sunshape},
  series = {30th ISES Biennial Solar World Congress 2011 : Kassel, Germany, 28 August - 2 September 2011. Vol. 5},
  booktitle = {30th ISES Biennial Solar World Congress 2011 : Kassel, Germany, 28 August - 2 September 2011. Vol. 5},
  publisher = {Curran},
  address   = {Red Hook, NY},
  organization    = {International Solar Energy Society},
  pages     = {3887 -- 3894},
  year      = {2012},
  language  = {en}
}
@inproceedings{ReisgenSchleserSchoeneetal.2012,
  author    = {Reisgen, Uwe and Schleser, Markus and Schoene, Jens and Hegger, Josef and Gallwoszus, J{\"o}rg and Feldmann, Markus and Kopp, Maik and G{\"u}ndel, Max},
  title     = {Investigation on bond mechanisms of innovative small-scale shear connectors between steel and concrete},
  series = {Bond in concrete 2012. Vol. 2. Bond in new materials and under severe conditions},
  booktitle = {Bond in concrete 2012. Vol. 2. Bond in new materials and under severe conditions},
  editor    = {Cairns, John W.},
  publisher = {Publisher creations},
  address   = {Manerbio, Brescia},
  isbn      = {978-88-907078-3-4},
  pages     = {893 -- 898},
  year      = {2012},
  language  = {en}
}
@article{ReisgenSchleserMokrovetal.2012,
  author    = {Reisgen, Uwe and Schleser, Markus and Mokrov, Oleg and Ahmed, Essam},
  title     = {Statistical modeling of laser welding of DP/TRIP steel sheets},
  series = {Optics and laser technology},
  volume    = {44},
  journal   = {Optics and laser technology},
  number    = {1},
  publisher = {Elsevier},
  address   = {Amsterdam},
  issn      = {1879-2545 (E-Journal); 0030-3992 (Print); 0308-4280 (Print)},
  doi       = {10.1016/j.optlastec.2011.05.025},
  pages     = {92 -- 101},
  year      = {2012},
  abstract  = {In this research work, a statistical analysis of the CO2 laser beam welding of dual phase (DP600)/transformation induced plasticity (TRIP700) steel sheets was done using response surface methodology. The analysis considered the effect of laser power (2-2.2 kW), welding speed (40-50 mm/s) and focus position (-1 to 0 mm) on the heat input, the weld bead geometry, uniaxial tensile strength, formability limited dome height and welding operation cost. The experimental design was based on Box-Behnken design using linear and quadratic polynomial equations for predicting the mathematical models. The results indicate that the proposed models predict the responses adequately within the limits of welding parameters being used and the welding speed is the most significant parameter during the welding process.},
  language  = {en}
}
@article{ReisgenSchleserMokrovetal.2012,
  author    = {Reisgen, Uwe and Schleser, Markus and Mokrov, Oleg and Ahmed, Essam},
  title     = {Optimization of laser welding of DP/TRIP steel sheets using statistical approach},
  series = {Optics and laser technology},
  volume    = {44},
  journal   = {Optics and laser technology},
  number    = {1},
  publisher = {Elsevier},
  address   = {Amsterdam},
  issn      = {1879-2545 (E-Journal); 0030-3992 (Print); 0308-4280 (Print)},
  doi       = {10.1016/j.optlastec.2011.06.028},
  pages     = {255 -- 262},
  year      = {2012},
  abstract  = {Generally, the quality of a weld joint is directly influenced by the welding input parameter settings. Selection of proper process parameters is important to obtain the desired weld bead profile and quality. In this research work, numerical and graphical optimization techniques of the CO2 laser beam welding of dual phase (DP600)/transformation induced plasticity (TRIP700) steel sheets were carried out using response surface methodology (RSM) based on Box-Behnken design. The procedure was established to improve the weld quality, increase the productivity and minimize the total operation cost by considering the welding parameters range of laser power (2-2.2 kW), welding speed (40-50 mm/s) and focus position (-1 to 0 mm). It was found that, RSM can be considered as a powerful tool in experimental welding optimization, even when the experimenter does not have a model for the process. Strong, efficient and low cost weld joints could be achieved using the optimum welding conditions.},
  language  = {en}
}
@article{ReisgenOlschokJakobsetal.2012,
  author    = {Reisgen, Uwe and Olschok, Simon and Jakobs, Stefan and Schleser, Markus and Mokrov, Oleg and Rossiter, Eduardo},
  title     = {Laser beam submerged arc hybrid welding},
  series = {Physics procedia},
  volume    = {39},
  journal   = {Physics procedia},
  publisher = {Elsevier},
  address   = {Amsterdam},
  issn      = {1875-3892},
  doi       = {10.1016/j.phpro.2012.10.016},
  pages     = {75 -- 83},
  year      = {2012},
  abstract  = {The laser beam-submerged arc hybrid welding method originates from the knowledge that, with increasing penetration depth, the laser beam process has a tendency to pore formation in the lower weld regions. The coupling with the energy-efficient submerged-arc process improves degassing and reduces the tendency to pore formation. The high deposition rate of the SA process in combination with the laser beam process offers, providing the appropriate choice of weld preparation, the possibility of welding plates with a thickness larger than 20° mm in a single pass, and also of welding thicker plates with the double-sided single pass technique.},
  language  = {en}
}
@article{ReisgenSchleserAbdurakhmanovetal.2012,
  author    = {Reisgen, Uwe and Schleser, Markus and Abdurakhmanov, Aydemir and Turichin, Gleb and Valdaitseva, Elena and Bach, Friedrich-Wilhelm and Hassel, Thomas and Beniyashi, Alexander},
  title     = {Investigation of factors influencing the formation of weld defects in non-vacuum electron beam welding},
  series = {The Paton welding journal},
  volume    = {2012},
  journal   = {The Paton welding journal},
  number    = {2},
  publisher = {Paton Publishing House},
  address   = {Kiev},
  issn      = {0957-798X},
  pages     = {11 -- 18},
  year      = {2012},
  abstract  = {The influence of welding condition parameters and properties of material on formation of defects, such as humping and undercuts, in non-vacuum electron beam welding was investigated. The influence of separate welding parameters on the quality of welds was determined.},
  language  = {en}
}
@article{ReisgenSchleserAbdurakhmanovetal.2012,
  author    = {Reisgen, Uwe and Schleser, Markus and Abdurakhmanov, Aydemir and Gumenyuk, Andrey},
  title     = {Measuring of plasma properties induced by non-vacuum electron beam welding},
  series = {Physics of plasma},
  volume    = {19},
  journal   = {Physics of plasma},
  number    = {1},
  publisher = {AIP Publishing},
  address   = {Melville, NY},
  issn      = {1089-7674 (E-Journal); 1070-664X (Print)},
  doi       = {10.1063/1.3675874},
  pages     = {1 -- 7},
  year      = {2012},
  abstract  = {Electron beam plasma measurement was realised by means of DIABEAM system invented by ISF RWTH Aachen. The Langmuir probe method is used for measurement. The relative simplicity of the method and the possibility of dispersion of high power on the probe allow its application for the investigation of high-power electron beams. The key element of the method is a rotating thin tungsten wire, which intersects the beam transversely on its axis and collects part of the current by itself. The signals, which are registered in the DIABEAM as a voltage, were taken in the form of amplitude. The conversion of the probe current into the distribution along the beam radius was realised using the Abel's method. A voltage-current characteristic was built for the beam current. The local electron density as well as the electron temperature, the floating potential and the plasma potential were measured and calculated by means of this characteristic.},
  language  = {en}
}
@inproceedings{HartmannKallweitFeldusenetal.2012,
  author    = {Hartmann, Axel and Kallweit, Stephan and Feldusen, Antje and Schr{\"o}der, Wolfgang},
  title     = {Detection of upstream propagating sound waves at buffet flow using high-speed PIV},
  pages     = {14 S. : graph. Darst.},
  year      = {2012},
  language  = {en}
}
@inproceedings{QuadfliegSchoeneSchleseretal.2012,
  author    = {Quadflieg, Till and Schoene, Jens and Schleser, Markus and Jockenh{\"o}vel, Stefan and Reisgen, Uwe and Gries, Thomas},
  title     = {Shear connectors for hybrid joints of metal and FRP},
  series = {Diversity in composites : conference proceedings : Composites Australia and CRC-ACS 2012 conference},
  booktitle = {Diversity in composites : conference proceedings : Composites Australia and CRC-ACS 2012 conference},
  editor    = {Heslehurst, Rikard Benton},
  publisher = {Composites Australia},
  address   = {Hawthorne},
  isbn      = {978-0-9873285-0-2},
  pages     = {[152] -- [160]},
  year      = {2012},
  language  = {en}
}
@article{ReisgenSchleserMokrovetal.2012,
  author    = {Reisgen, Uwe and Schleser, Markus and Mokrov, Oleg and Zabirov, Alexander and F{\"u}ssel, Uwe and Schnick, Michael and Hertel, Martin and Jaeckel, Sebastian},
  title     = {Modelling and visualisation of the GMA process},
  series = {Welding and Cutting},
  volume    = {11},
  journal   = {Welding and Cutting},
  number    = {4},
  publisher = {DVS Verlag},
  address   = {D{\"u}sseldorf},
  issn      = {1612-3433},
  pages     = {242 -- 249},
  year      = {2012},
  language  = {en}
}
@inproceedings{ReisgenSchleserAbdurakhmanovetal.2012,
  author    = {Reisgen, Uwe and Schleser, Markus and Abdurakhmanov, Aydemir and Gumenyuk, Andrej},
  title     = {Application of electron beam welding to fabrication of steel-aluminium dissimilar joint},
  series = {Beam technologies \& laser application : proceedings of the VII international conference, Saint Petersburg, Sept. 18-21, 2012},
  booktitle = {Beam technologies \& laser application : proceedings of the VII international conference, Saint Petersburg, Sept. 18-21, 2012},
  publisher = {Publ. House},
  address   = {Saint Petersburg},
  pages     = {265 -- 279},
  year      = {2012},
  language  = {en}
}
@article{BorgmeierBongaertsMeinhardt2012,
  author    = {Borgmeier, Claudia and Bongaerts, Johannes and Meinhardt, Friedhelm},
  title     = {Genetic analysis of the Bacillus licheniformis degSU operon and the impact of regulatory mutations on protease production},
  series = {Journal of biotechnology},
  volume    = {159},
  journal   = {Journal of biotechnology},
  number    = {1-2},
  publisher = {Elsevier},
  address   = {Amsterdam},
  issn      = {1873-4863 (E-Journal); 0168-1656 (Print)},
  doi       = {10.1016/j.jbiotec.2012.02.011},
  pages     = {12 -- 20},
  year      = {2012},
  abstract  = {Disruption experiments targeted at the Bacillus licheniformis degSU operon and GFP-reporter analysis provided evidence for promoter activity immediately upstream of degU. pMutin mediated concomitant introduction of the degU32 allele - known to cause hypersecretion in Bacillus subtilis - resulted in a marked increase in protease activity. Application of 5-fluorouracil based counterselection through establishment of a phosphoribosyltransferase deficient Δupp strain eventually facilitated the marker-free introduction of degU32 leading to further protease enhancement achieving levels as for hypersecreting wild strains in which degU was overexpressed. Surprisingly, deletion of rapG - known to interfere with DegU DNA-binding in B. subtilis - did not enhance protease production neither in the wild type nor in the degU32 strain. The combination of degU32 and Δupp counterselection in the type strain is not only equally effective as in hypersecreting wild strains with respect to protease production but furthermore facilitates genetic strain improvement aiming at biological containment and effectiveness of biotechnological processes.},
  language  = {en}
}
@article{BoettcherHaselhuhnJakseetal.2012,
  author    = {Boettcher, Martin and Haselhuhn, Angelika and Jakse, Gerhard and Brehmer, Bernhard and Kirschner-Hermanns, Ruth},
  title     = {Overactive bladder syndrome: an underestimated long-term problem after treatment of patients with localized prostate cancer?},
  series = {BJU international},
  volume    = {109},
  journal   = {BJU international},
  number    = {12},
  publisher = {Wiley-Blackwell},
  address   = {Oxford},
  issn      = {1365-2176 (E-Journal); 1464-410X (E-Journal); 0007-1331 (Print); 1464-4096 (Print)},
  doi       = {10.1111/j.1464-410X.2011.10623.x},
  pages     = {1824 -- 1830},
  year      = {2012},
  abstract  = {In this study we observed courses of micturition symptoms and differentiated degrees of symptoms for each point in time while also considering the impact of bothersomeness. Our data show that not only significantly more patients who have undergone BT suffer from OAB than those who have undergone RP, but also that those affected show significantly higher values for severity of OAB symptoms throughout the whole observation period of 36 months. Our data analysis further shows that variability of OAB symptoms as well as fluctuation of severity of OAB symptoms vary to a significantly higher degree after BT than after RP. Looking only at mean figures at a given point in time clearly underestimates the underlying problem. This fact is not reflected in the literature.},
  language  = {en}
}
@article{OertelBung2012,
  author    = {Oertel, Mario and Bung, Daniel B.},
  title     = {Initial stage of two-dimensional dam-break waves: laboratory versus VOF},
  series = {Journal of hydraulic research},
  volume    = {50},
  journal   = {Journal of hydraulic research},
  number    = {1},
  publisher = {Taylor \& Francis},
  address   = {London},
  issn      = {1814-2079 (E-Journal); 0022-1686 (Print)},
  doi       = {10.1080/00221686.2011.639981},
  pages     = {89 -- 97},
  year      = {2012},
  abstract  = {Since several decades, dam-break waves have been of main research interest. Mathematical approaches have been developed by analytical, physical and numerical models within the past 120 years. During the past 10 years, the number of research investigations has increased due to improved measurement techniques as well as significantly increased computer memories and performances. In this context, the present research deals with the initial stage of two-dimensional dam-break waves by comparing physical and numerical model results as well as analytical approaches. High-speed images and resulting particle image velocimetry calculations are thereby compared with the numerical volume-of-fluid (VOF) method, included in the commercial code FLOW-3D. Wave profiles and drag forces on placed obstacles are analysed in detail. Generally, a good agreement between the laboratory and VOF results is found.},
  language  = {en}
}
@inproceedings{FeldmannPyschnyDoeringetal.2012,
  author    = {Feldmann, Markus and Pyschny, D. and D{\"o}ring, Bernd and Kuhnhenne, Markus},
  title     = {Life cycle assessment of steel constructions},
  series = {Life-cycle and sustainability of civil infrastructure systems : proceedings of the Third International Symposium on Life-Cycle Civil Engineering (IALCCE'12) : Vienna, Austria, October 3-6, 2012},
  booktitle = {Life-cycle and sustainability of civil infrastructure systems : proceedings of the Third International Symposium on Life-Cycle Civil Engineering (IALCCE'12) : Vienna, Austria, October 3-6, 2012},
  publisher = {Taylor and Francis},
  address   = {Hoboken},
  organization    = {International Symposium on Life-Cycle Civil Engineering <3, 2012, Wien>},
  isbn      = {978-0-203-10336-4},
  pages     = {321},
  year      = {2012},
  language  = {en}
}
@inproceedings{KuhnhenneDoeringPyschnyetal.2012,
  author    = {Kuhnhenne, Markus and D{\"o}ring, Bernd and Pyschny, Dominik and Feldmann, Markus},
  title     = {Energy efficient sandwich construction},
  series = {Proceedings of the VI International Congress on Architectural Envelopes : 20.6. - 22.6.2012, San Sebastian, Spain},
  booktitle = {Proceedings of the VI International Congress on Architectural Envelopes : 20.6. - 22.6.2012, San Sebastian, Spain},
  publisher = {ICAE},
  organization    = {International Congress on Architectural Envelopes <6, 2012, San Sebastian>},
  pages     = {277 -- 285},
  year      = {2012},
  language  = {en}
}