TY - JOUR U1 - Zeitschriftenartikel, wissenschaftlich - nicht begutachtet (unreviewed) A1 - Lattner, Yannick A1 - Geller, Marius A1 - Kluck, Norbert T1 - Efficiency Approximation of Centrifugal Compressors in the Cordier Diagram N2 - We present a simulation data-based efficiency approximation for radial turbocompressors, which is implemented in the well-known Cordier diagram. A sophisticated CAE workflow is used to calculate the operational characteristics of 50 machine designs with 50 impeller geometry variations each. A Kriging-based surrogate model is trained to approximate the efficiency of any machine designs' best geometry design. The models are implemented into a machine design workflow. As a result, duty-specific Cordier lines are introduced. They are automatically generated for a set of machine design parameters. The efficiency of the designs along the duty-specific Cordier lines is approximated. Using optimization techniques, an optimal compressor design for the given duty on every specific Cordier line may be identified. This highly increases the amount of information available in the early design stages for radial turbocompressors. KW - CENTRIFUGAL COMPRESSOR, CORDIER DIAGRAM, CFD, METAMODELING, DESIGN OF EXPERIMENTS Y1 - 2023 UN - https://nbn-resolving.org/urn:nbn:de:hbz:dm13-33661 U6 - https://doi.org/10.26205/opus-3366 DO - https://doi.org/10.26205/opus-3366 SP - 12 S1 - 12 ER - TY - JOUR U1 - Zeitschriftenartikel, wissenschaftlich - begutachtet (reviewed) A1 - Lattner, Yannick A1 - Geller, Marius T1 - Radial Turbocompressor Chord Length Approximation for the Reynold's Number Calculation N2 - We present an approximation model for the chord length of radial turbocompressors. The model enables the calculation of a compressor's chord Reynold's number during the machine design process. The chord Reynold's number is shown to be the most accurate representation of the fluid dynamic properties inside the radial turbocompressor's impeller. It — however — requires the computation of the chord length, which is only available after defining the final impeller geometry. The method presenting in this paper only employs the compressors principal dimensions to approximate the chord length. The chord is modelled using a Bézier spline and quarter ellipse. This enables the earlier use of the chord Reynold's number during the machine design process of radial turbocompressors. KW - Strömungsmaschine , Reynolds-Zahl KW - Radial turbocompressors KW - Reynold's number KW - Turbomachinery KW - Design methods Y1 - 2023 UN - https://nbn-resolving.org/urn:nbn:de:hbz:dm13-33351 U6 - https://doi.org/10.26205/opus-3335 DO - https://doi.org/10.26205/opus-3335 ER - TY - THES U1 - Bachelor Thesis A1 - Müller-Baumgart, Antonia T1 - Estimation of fuel consumption of pleasure vessels based on environmental data models Y2 - 2022 UN - https://nbn-resolving.org/urn:nbn:de:hbz:dm13-31988 U6 - https://doi.org/10.26205/opus-3198 DO - https://doi.org/10.26205/opus-3198 SP - 130 S1 - 130 ER - TY - THES U1 - Master Thesis A1 - Shi, Yanchen T1 - Power Simulation of a MIPS microAptiv UP Core implemented as a virtual ASIC prototype in a 65nm CMOS technology N2 - This thesis presents a power simulation of a MIPS MicroAptiv UP Core implemented as a virtual ASIC prototype using Taiwan Semiconductor Manufacturing Company(TSMC) 65 nm CMOS technology. Based on the MIPS instruction set program data is generated and introduced in the simulation by means of initialization files. Before the simulation, technology specific SRAM modules are integrated into theMIPS core. Two different programs are used for power characterization. The first program performs frequent memory accesses by means of load/store word instructions, while the second program is a loop which operates on registers only and mainly increments addresses. The simulation is based on a virtual prototype which is generated by synthesis and place & route including post-layout parasitic extractions. The stimuli for the power extraction is generated via gate-level simulation and forwarded to the power calculation engine. The effect of X-propagation on gate-level simulations is avoided by modifying the address-related statements in the execution data path module, which use another form of 2 to 1 multiplexer, setting the output to zero for all input signals even with an initial value of ’x’ without changing the functionality. Finally, the consumed power is provided by reports generated by the power simulation engine. The memory-centric program consumes 35.39mW of internal power using instructions, which is 0.73mW less than the internal power of the register-centric program, and the overall average power is also lower by almost 0.7mW. Y2 - 2022 UN - https://nbn-resolving.org/urn:nbn:de:hbz:dm13-32171 U6 - https://doi.org/10.26205/opus-3217 DO - https://doi.org/10.26205/opus-3217 SP - 93 S1 - 93 ER - TY - BOOK U1 - Buch A1 - Nielsen, Jakob A1 - Berger, J. M. A1 - Gilutz, Shuli A1 - Whitenton, Kathryn T1 - Return on Investment (ROI) for Usability N2 - Learn techniques for estimating the cost of usability activities and measuring improvements based on hundreds of development projects and 72 case studies. We present techniques for converting usage metrics into business gains for different industries (e.g., intranets, e-commerce, marketing, software, and electronics and hardware products). This 212-page report includes 131 screenshots of before and after designs, and discussions of design elements that increase business metrics. N1 - 4th edition SP - 217 S1 - 217 PB - Nielsen Norman Group CY - Fremont, CA ER - TY - RPRT U1 - Forschungsbericht A1 - Faix, Axel A1 - Büchler, Jan-Philipp T1 - Competitive advantage through innovation management BT - analyzes and results of the IHK-InnoMonitor 2015 N2 - Band 1 der Forschungsberichte zum Innovationsmanagement, herausgegeben von der Forschungsgruppe Innovationsexzellenz der Fachhochschule Dortmund (Jan-Philipp Büchler, Axel Faix, Wolfgang Müller) Y2 - 2015 UN - https://nbn-resolving.org/urn:nbn:de:hbz:dm13-21458 U6 - https://doi.org/10.26205/opus-2145 DO - https://doi.org/10.26205/opus-2145 SP - 10 S1 - 10 ER - TY - RPRT U1 - Forschungsbericht T1 - The ReAl Computer Architecture BT - ReAl = Resource Algebra N2 - Forschungsbericht Projektleiter: Wolfgang Matthes Zeitraum: 2009-2011 Y2 - 2011 U6 - https://nbn-resolving.org/urn:nbn:de:hbz:dm13-20911 UN - https://nbn-resolving.org/urn:nbn:de:hbz:dm13-20911 SP - 2 S1 - 2 ER - TY - RPRT U1 - Forschungsbericht T1 - Distributed audio network for speech enhancement in challenging noise backgrounds N2 - Forschungsbericht Projektleitung: Burkhard Igek Kooperationspartner: Curtin University of Technology, Perth, Australien Zeitraum: 2006-2009 Förderung: Deutsche Forschungsgemeinschaft (DFG) Y2 - 2011 U6 - https://nbn-resolving.org/urn:nbn:de:hbz:dm13-20891 UN - https://nbn-resolving.org/urn:nbn:de:hbz:dm13-20891 SP - 2 S1 - 2 ER - TY - RPRT U1 - Forschungsbericht T1 - Evaluating a location sensitive multimedia museum guide: results from a field trial N2 - Forschungsbericht Projektleiter: Uwe Großmann Forschungsschwerpunkt: Mobile Business Mobile Systems Zeitraum: 2004-2008 Mitarbeiter: Sebastian Gansemer, Oliver Suttorp Förderung: Bundesministerium für Bildung und Forschung: Anwendungsorientierte Forschung und Entwicklung an Fachhochschulen (aFuE) Verbundprojekt Projektpartner: RWE-Museum "Strom und Leben", Recklinghausen: Hanswalter Dobbelmann Y2 - 2008 U6 - https://nbn-resolving.org/urn:nbn:de:hbz:dm13-20408 UN - https://nbn-resolving.org/urn:nbn:de:hbz:dm13-20408 SP - 4 S1 - 4 ER - TY - JOUR U1 - Zeitschriftenartikel, wissenschaftlich - begutachtet (reviewed) A1 - Blome, Frerk A1 - Möller, Christina A1 - Böning, Anja T1 - Open House? - Class-specific career opportunities within German universities JF - Social Inclusion N2 - This article focuses on the development of class-specific inequalities within German universities. Based on data on the social origin of students, doctoral students, and professors in the long-term cross-section, the article views the empirically observable dynamic of social closure of higher education since the 1950s. The focus of interest is on the level of the professorship. Data show that career conditions for underprivileged groups have deteriorated again. This finding is discussed in the context of social closure theories. The article argues that closure theories consider social closure processes primarily as intentional patterns of action, aimed at a strategic monopolization of participation, and securing social power. Such an analytical approach means that unintended closure processes remain understudied. Our conclusion is that concealed modes of reproduction of social structures ought to be examined and theorized more intensively due to their importance for the elimination of social inequality within universities. Y1 - 2019 U6 - https://nbn-resolving.org/urn:nbn:de:hbz:dm13-20184 UN - https://nbn-resolving.org/urn:nbn:de:hbz:dm13-20184 SN - 2183-2803 SS - 2183-2803 VL - 7 (2019) IS - 1 SP - 101 EP - 110 ER -