@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{Jochim2012,
  author    = {Jochim, Haldor E.},
  title     = {Die Ostheidebahn - eine Alternative zur Y-Trasse},
  series = {ETR - Eisenbahntechnische Rundschau},
  volume    = {61},
  journal   = {ETR - Eisenbahntechnische Rundschau},
  number    = {11},
  publisher = {DVV Media Group},
  address   = {Hamburg},
  issn      = {0013-2845},
  pages     = {34 -- 37},
  year      = {2012},
  language  = {de}
}
@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}
}
@article{BleckenHolthausSellheier2012,
  author    = {Blecken, Udo and Holthaus-Sellheier, Ursula},
  title     = {Quantitative Prognoseverfahren f{\"u}r Mietpreise von Bueroimmobilien am Beispiel D{\"u}sseldorf},
  series = {GuG : Grundst{\"u}cksmarkt und Grundst{\"u}ckswert},
  volume    = {23},
  journal   = {GuG : Grundst{\"u}cksmarkt und Grundst{\"u}ckswert},
  number    = {1},
  publisher = {Werner},
  address   = {K{\"o}ln},
  issn      = {0938-0175},
  pages     = {12 -- 21},
  year      = {2012},
  language  = {de}
}
@article{SchneiderSchneider2012,
  author    = {Schneider, Bettina and Schneider, Wilhelm},
  title     = {Jahresabschluss nach BilMoG : Ansatz-, Ausweis- und Bewertungsvorschriften},
  series = {Das Wirtschaftsstudium : wisu ; Zeitschrift f{\"u}r Ausbildung, Examen, Berufseinstieg und Fortbildung},
  volume    = {41},
  journal   = {Das Wirtschaftsstudium : wisu ; Zeitschrift f{\"u}r Ausbildung, Examen, Berufseinstieg und Fortbildung},
  number    = {4},
  publisher = {Lange},
  address   = {D{\"u}sseldorf},
  issn      = {0340-3084},
  pages     = {529 -- 535},
  year      = {2012},
  language  = {de}
}
@article{SpelthahnKirsanovLeginetal.2012,
  author    = {Spelthahn, Heiko and Kirsanov, Dmitry and Legin, Andrey and Osterrath, Thomas and Schubert, J{\"u}rgen and Zander, Willi and Sch{\"o}ning, Michael Josef},
  title     = {Development of a thin-film sensor array for analytical monitoring of heavy metals in aqueous solutions},
  series = {Physica Status Solidi (a)},
  volume    = {209},
  journal   = {Physica Status Solidi (a)},
  number    = {5},
  publisher = {Wiley-VCH},
  address   = {Weinheim},
  isbn      = {1862-6319},
  doi       = {10.1002/pssa.201100733},
  pages     = {885 -- 891},
  year      = {2012},
  abstract  = {In industrial processes there is a variety of heavy metals (e.g., copper, zinc, cadmium, and lead) in use for wires, coatings, paints, alloys, batteries, etc. Since the application of these transition metals for industry is inevitable, it is a vital task to develop proper analytical techniques for their monitoring at low activity levels, especially because most of these elements are acutely toxic for biological organisms. The determination of ions in solution by means of a simple and inexpensive sensor array is, therefore, a promising task. In this work, a sensor array with heavy metal-sensitive chalcogenide glass membranes for the simultaneous detection of the four ions Ag⁺, Cu2⁺, Cd2⁺, and Pb2⁺ in solution is realized. The results of the physical characterization by means of microscopy, profilometry, Rutherford backscattering spectroscopy (RBS), and scanning electron microscopy (SEM) as well as the electrochemical characterization by means of potentiometric measurements are presented. Additionally, the possibility to expand the sensor array by polymeric sensor membranes is discussed.},
  language  = {en}
}
@article{SpelthahnSchubertSchoening2012,
  author    = {Spelthahn, Heiko and Schubert, J{\"u}rgen and Sch{\"o}ning, Michael Josef},
  title     = {D{\"u}nnschichtsensoren f{\"u}r die Schwermetallanalytik},
  series = {GIT : Labor-Fachzeitschrift},
  volume    = {56},
  journal   = {GIT : Labor-Fachzeitschrift},
  number    = {4},
  publisher = {Wiley-VCH},
  address   = {Weinheim},
  issn      = {0016-3538},
  pages     = {285 -- 287},
  year      = {2012},
  abstract  = {Die Detektion von Schadstoffen repr{\"a}sentiert in der Umweltanalytik eine wichtige Aufgabenstellung. Gerade die Abwasser- bzw. Brauchwasseranalytik sowie die Prozesskontrolle haben einen hohen Stellenwert. Siliziumbasierte D{\"u}nnschichtsensoren bieten eine kosteng{\"u}nstige M{\"o}glichkeit, „online"-Messungen bzw. Vor-Ort-Messungen zeitnah durchzuf{\"u}hren. In dieser Arbeit wird ein potentiometrisches Sensorarray auf der Basis von Chalkogenidgl{\"a}sern zur Detektion von Schwermetallen in w{\"a}ssrigen Medien vorgestellt.},
  language  = {en}
}
@article{KotliarLanzlHanssenetal.2012,
  author    = {Kotliar, Konstantin and Lanzl, Ines M. and Hanssen, Henner and Eberhardt, Karla and Vilser, Walthard and Halle, Martin and Heemann, Uwe and Schmidt-Trucks{\"a}ss, Arno and Baumann, Marcus},
  title     = {Does increased blood pressure rather than aging influence retinal pulse wave velocity?},
  series = {Investigative Ophthalmology \& Visual Science, IOVS},
  volume    = {53},
  journal   = {Investigative Ophthalmology \& Visual Science, IOVS},
  number    = {4},
  publisher = {ARVO},
  address   = {Rockville, Md.},
  issn      = {0146-0404},
  doi       = {10.1167/iovs.11-8815},
  pages     = {2119 -- 2126},
  year      = {2012},
  abstract  = {Purpose: It was demonstrated previously that retinal pulse wave velocity (rPWV) as a measure of retinal arterial stiffness is increased in aged anamnestically healthy volunteers compared with young healthy subjects. Using novel methodology of rPWV assessment this finding was confirmed and investigated whether it might relate to the increased blood pressure usually accompanying the aging process, rather than to the aging itself. Methods: A total of 12 young 25.5-year-old (24.0-28.8) [median(1st quartile-3rd quartile)] and 12 senior 68.5-year-old (63.8-71.8) anamnestically healthy volunteers; and 12 senior 63.0-year-old (60.8-65.0) validated healthy volunteers and 12 young 33.0-year-old (29.5-35.0) hypertensive patients were examined. Time-dependent alterations of vessel diameter were assessed by the Dynamic Vessel Analyzer in a retinal artery of each subject. The data were filtered and processed using mathematical signal analysis and rPWVs were calculated. Results: rPWV amounted to 1200 (990-1470) RU (relative units)/s in the hypertensive group and to 1040 (700-2230) RU/s in anamnestically healthy seniors. These differed significantly from rPWVs in young healthy group (410 [280-500] RU/s) and in validated healthy seniors (400 [320-510] RU/s). rPWV associated with age and mean arterial pressure (MAP) in the pooled cohort excluded validated healthy seniors. In a regression model these associations remain when alternately adjusted for MAP and age. When including validated healthy seniors in the pooled cohort only association with MAP remains. Conclusions: Both aging (with not excluded cardiovascular risk factors) and mild hypertension are associated with elevated rPWV. rPWV increases to a similar extent both in young mildly hypertensive subjects and in aged anamnestically healthy persons. Healthy aging is not associated with increased rPWV.},
  language  = {en}
}
@article{KlingeWilkeMuehl2012,
  author    = {Klinge, Uwe and Wilke, Ralf and M{\"u}hl, Thomas},
  title     = {Auswahl der Herniennetze nach der "effektiven Porosit{\"a}t" - warum das Gewicht weniger wichtig ist},
  series = {Chirurgische Allgemeine : CHAZ ; Zeitung f{\"u}r Klinik und Praxis},
  volume    = {13},
  journal   = {Chirurgische Allgemeine : CHAZ ; Zeitung f{\"u}r Klinik und Praxis},
  number    = {12},
  publisher = {Kaden},
  address   = {Mannheim},
  isbn      = {1615-5378},
  pages     = {297 -- 301},
  year      = {2012},
  language  = {de}
}
@article{BohrnStuetzFuchsetal.2012,
  author    = {Bohrn, U. and St{\"u}tz, E. and Fuchs, K. and Fleischer, M. and Sch{\"o}ning, Michael Josef and Wagner, P.},
  title     = {Monitoring of irritant gas using a whole-cell-based sensor system},
  series = {Sensors and Actuators B: Chemical},
  volume    = {175},
  journal   = {Sensors and Actuators B: Chemical},
  publisher = {Elsevier},
  address   = {Amsterdam},
  issn      = {0925-4005},
  doi       = {10.1016/j.snb.2012.05.088},
  pages     = {208 -- 217},
  year      = {2012},
  abstract  = {Cell-based sensors for the detection of gases have long been underrepresented, due to the cellular requirement of being cultured in a liquid environment. In this work we established a cell-based gas biosensor for the detection of toxic substances in air, by adapting a commercial sensor chip (Bionas®), previously used for the measurement of pollutants in liquids. Cells of the respiratory tract (A549, RPMI 2650, V79), which survive at a gas phase in a natural context, are used as biological receptors. The physiological cell parameters acidification, respiration and morphology are continuously monitored in parallel. Ammonia was used as a highly water-soluble model gas to test the feasibility of the sensor system. Infrared measurements confirmed the sufficiency of the medium draining method. This sensor system provides a basis for many sensor applications such as environmental monitoring, building technology and public security.},
  language  = {en}
}
@article{SchneiderSchneider2012,
  author    = {Schneider, Bettina and Schneider, Wilhelm},
  title     = {Due Diligence - Grundlagen und Checkliste f{\"u}r KMU},
  series = {Betriebswirtschaft im Blickpunkt},
  journal   = {Betriebswirtschaft im Blickpunkt},
  publisher = {IWW Institut f{\"u}r Wissen in der Wirtschaft},
  address   = {Nordkirchen},
  issn      = {2191-1118},
  pages     = {148 -- 149},
  year      = {2012},
  abstract  = {Im Folgenden sollen Anlass und Inhalt einer Due Diligence erl{\"a}utert werden. Im Rahmen einer Checkliste werden Beratern und Unternehmen Hinweise zu m{\"o}glichen Pr{\"u}fungsgebieten sowie zu vorzuhaltenden oder zu pr{\"u}fenden Unterlagen gegeben. Entstanden ist die Checkliste aus der langj{\"a}hrigen praktischen T{\"a}tigkeit der Autoren bei einer großen Wirtschaftspr{\"u}fungsgesellschaft bzw. einer deutschen Großbank.},
  language  = {de}
}
@article{WernerGroebelKrumbeetal.2012,
  author    = {Werner, Frederik and Groebel, Simone and Krumbe, Christoph and Wagner, Torsten and Selmer, Thorsten and Yoshinobu, Tatsuo and Baumann, Marcus and Sch{\"o}ning, Michael Josef},
  title     = {Nutrient concentration-sensitive microorganism-based biosensor},
  series = {Physica Status Solidi (a)},
  volume    = {209},
  journal   = {Physica Status Solidi (a)},
  number    = {5},
  publisher = {Wiley-VCH},
  address   = {Weinheim},
  issn      = {1862-6319},
  doi       = {10.1002/pssa.201100801},
  pages     = {900 -- 904},
  year      = {2012},
  language  = {en}
}
@article{KirchnerReisertPuetzetal.2012,
  author    = {Kirchner, Patrick and Reisert, Steffen and P{\"u}tz, Patrick and Keusgen, Michael and Sch{\"o}ning, Michael Josef},
  title     = {Characterisation of polymeric materials as passivation layer for calorimetric H2O2 gas sensors},
  series = {Physica Status Solidi (a)},
  volume    = {209},
  journal   = {Physica Status Solidi (a)},
  number    = {5},
  publisher = {Wiley-VCH},
  address   = {Weinheim},
  issn      = {1862-6319},
  doi       = {10.1002/pssa.201100773},
  pages     = {859 -- 863},
  year      = {2012},
  abstract  = {Calorimetric gas sensors for monitoring the H₂O₂ concentration at elevated temperatures in industrial sterilisation processes have been presented in previous works. These sensors are built up in form of a differential set-up of a catalytically active and passive temperature-sensitive structure. Although, various types of catalytically active dispersions have been studied, the passivation layer has to be established and therefore, chemically as well as physically characterised. In the present work, fluorinated ethylene propylene (FEP), perfluoralkoxy (PFA) and epoxy-based SU-8 photoresist as temperature-stable polymeric materials have been investigated for sensor passivation in terms of their chemical inertness against H₂O₂, their hygroscopic properties as well as their morphology. The polymeric materials were deposited via spin-coating on the temperature-sensitive structure, wherein spin-coated FEP and PFA show slight agglomerates. However, they possess a low absorption of humidity due to their hydrophobic surface, whereas the SU-8 layer has a closed surface but shows a slightly higher absorption of water. All of them were inert against gaseous H₂O₂ during the characterisation in H₂O₂ atmosphere that demonstrates their suitability as passivation layer for calorimetric H₂O₂ gas sensors.},
  language  = {en}
}
@article{Huening2012,
  author    = {H{\"u}ning, Felix},
  title     = {Using Trench PowerMOSFETs in Linear Mode},
  series = {Power Electronics Europe (2012)},
  journal   = {Power Electronics Europe (2012)},
  publisher = {DFA Media},
  address   = {Tonbridge},
  issn      = {1748-3530},
  pages     = {27 -- 29},
  year      = {2012},
  abstract  = {If we think about applications for modern Power MOSFETs using trench technology, running them in linear mode may not be top of the priority list. Yet there are multiple uses for Trench Power MOSFETs in linear mode. In fact, even turning the device on and off in switching applications is a form of linear operation. Also, these components can be run in linear mode to protect the device against voltage surges. This article will illustrate the factors that need to be considered for linear operation and show how Trench Power MOSFETs are suited to it.},
  language  = {en}
}
@article{MartiusMischke2012,
  author    = {Martius, Alexander and Mischke, Winfried},
  title     = {Die Vernehmung des Wohnungseigent{\"u}mers : wann ist der Wohnungseigent{\"u}mer als Partei, wann als Zeuge zu vernehmen?},
  series = {Zeitschrift f{\"u}r die Anwaltspraxis : ZAP},
  journal   = {Zeitschrift f{\"u}r die Anwaltspraxis : ZAP},
  number    = {Fach 7},
  publisher = {ZAP Verlag},
  address   = {Bonn},
  issn      = {0936-7292},
  pages     = {431 -- 434},
  year      = {2012},
  language  = {de}
}
@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 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}
}
@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     = {Modellierung und Visualisierung der MSG-Lichtbogenprozesse},
  series = {Schweissen und Schneiden : Fachzeitschrift f{\"u}r Schweißen und verwandte Verfahren},
  volume    = {64},
  journal   = {Schweissen und Schneiden : Fachzeitschrift f{\"u}r Schweißen und verwandte Verfahren},
  number    = {4},
  publisher = {DVS Verlag},
  address   = {D{\"u}sseldorf},
  issn      = {0036-7184},
  pages     = {166 -- 174},
  year      = {2012},
  language  = {de}
}