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Sökning: LAR1:lu > Chalmers tekniska högskola > Konferensbidrag

  • Resultat 1-10 av 86
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1.
  • Abou-Taouk, Abdallah, 1982-, et al. (författare)
  • A Four-Step Global Reaction Mechanism for CFD Simulations of Flexi-Fuel Burner for Gas Turbines
  • 2011
  • Ingår i: Turbulence, Heat and Mass Transfer 7. - ICHMT. - 9781567003017 ; s. 785-788
  • Konferensbidrag (refereegranskat)abstract
    • A reduced four-step scheme for Computational Fluid Dynamics (CFD) analysis is presented here in the context of industrial type laboratory combustor. The present scheme has been optimized for a syngas mixture consisting of 10% CH4, 22.5% CO and 67.5% H2 by volume, and for a methane-air mixture. The optimization of the global scheme is done by comparing with the detailed San Diego mechanism using perfectly stirred reactor (PSR) and laminar flame speed calculations. The four-step global scheme has been applied to the CFD analysis of a swirl-stabilized flexi-fuel burner. Both reacting and non-reacting cases has been computed, using a hybrid Unsteady RANS/Large Eddy Simulation (URANS/LES) technique. Comparisons between CFD results and experimental data in the form of Particle Image Velocimetry (PIV) data, Planar Laser Induced Fluorescence (pLIF) and Proper Orthogonal Decomposition (POD) analysis from an atmospheric burner test rig at Lund University are presented. The CFD results scheme show good agreement with the experimental data.
2.
  • Alizadehheidari, Mohammadreza, 1987-, et al. (författare)
  • Nanoconfined circular DNA
  • 2014
  • Ingår i: 18th International Conference on Miniaturized Systems for Chemistry and Life Sciences, MicroTAS 2014. - Chemical and Biological Microsystems Society. - 9780979806476 ; s. 1353-1355
  • Konferensbidrag (refereegranskat)abstract
    • Studies of nanoconfined circular DNA are of interest both from a biological as well as a fundamental polymer physics perspective. We here present the use of nanofluidic channels as a tool for comparing statics and dynamics of the linear and circular configuration of the same DNA molecule.
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3.
  • Almström, Peter, et al. (författare)
  • Achieving Sustainable Production through Increased Utilization of Production Resources
  • 2011
  • Ingår i: Proceedings of the 4th Swedish Production Symposium, SPS11, Lund, May 3-5, 2011.
  • Konferensbidrag (refereegranskat)abstract
    • Abstract in Undetermined There seems to be a quite divergent view on sustainable production, mainly based on the perspective applied. From a global perspective, every kind of material consumption and growth is basically unwanted and should be minimized. This reflects in economic sustainability parameters that point towards producing as little as possible and social parameters pointing at eliminating abuse of human rights etc. On the other hand, international summits on sustainability have stated that it is a human right to have a certain standard of living, which implies increase in production but with less resource consumption. This global perspective is however not very helpful when focusing on more local level, for example Swedish manufacturing industry. To achieve a long-term job security the manufacturing companies need to be long-term prosperous. Further, to be able to maintain profitability levels, manufacturing companies need to continuously increase productivity. Utilization deals with using production equipment in a cost efficient way and this article will highlight how utilization affects different aspects of sustainable production, the link between utilization and productivity, as well as practical considerations when improving utilization in manufacturing industry.
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4.
  • Andersson, Urban, 1965-, et al. (författare)
  • ORCiD @ Chalmers: Membership and implementation
  • 2014
  • Ingår i: Open Repositories 2014, June 9-13, Helsinki, Finland.
  • Konferensbidrag (övrigt vetenskapligt)abstract
    • Chalmers University became an institutional member of the ORCID community in June 2013. The membership, as well as the local ORCID services and support, is coordinated and maintained by the university library. Since then we have completed the first phase of the implementation of ORCID id:s at the university - including a pilot project, in which we worked closely together with one of the research departments, and the development of a new easy-to-use web service for the creation of ORCID id:s and for connecting these – and existing id:s - to the university infrastructure, by the use of API:s provided by ORCID and corresponding systems. This service was launched in January 2014 and can be found at orcid.chalmers.se. The proposed poster will demonstrate the current status of our project and what has been done up until now - including workflows, infrastructure integration, technical implementation and, of course, detailed screenshots to illustrate the different parts of the process. It will also include our key experiences so far, as well as to try and provide a quick look into the future and what our next steps might be.
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5.
  • Assarsson, Ulf, 1972-, et al. (författare)
  • A geometry-based soft shadow volume algorithm using graphics hardware
  • 2003
  • Ingår i: ACM Transactions on Graphics. - ACM. - 0730-0301. ; 22:3, s. 511-520
  • Konferensbidrag (refereegranskat)abstract
    • Most previous soft shadow algorithms have either suffered from aliasing, been too slow, or could only use a limited set of shadow casters and/or receivers. Therefore, we present a strengthened soft shadow volume algorithm that deals with these problems. Our critical improvements include robust penumbra wedge construction, geometry-based visibility computation, and also simplified computation through a four-dimensional texture lookup. This enables us to implement the algorithm using programmable graphics hardware, and it results in images that most often are indistinguishable from images created as the average of 1024 hard shadow images. Furthermore, our algorithm can use both arbitrary shadow casters and receivers. Also, one version of our algorithm completely avoids sampling artifacts which is rare for soft shadow algorithms. As a bonus, the four-dimensional texture lookup allows for small textured light sources, and, even video textures can be used as light sources. Our algorithm has been implemented in pure software, and also using the GeForce FX emulator with pixel shaders. Our software implementation renders soft shadows at 0.5-5 frames per second for the images in this paper. With actual hardware, we expect that our algorithm will render soft shadows in real time. An important performance measure is bandwidth usage. For the same image quality, an algorithm using the accumulated hard shadow images uses almost two orders of magnitude more bandwidth than our algorithm.
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7.
  • Berntsson Svensson, Richard, 1978-, et al. (författare)
  • A Case Study Evaluation of the Guideline-Supported QUPER Model for Elicitation of Quality Requirements
  • 2015
  • Ingår i: Requirements Engineering: Foundation for Software Quality/Lecture Notes in Computer Science. - Springer. - 1611-3349 .- 0302-9743. - 978-3-319-16100-6 ; 9013, s. 230-246
  • Konferensbidrag (refereegranskat)abstract
    • [Context & motivation] For market-driven software product developing organizations operating on a competitive open market, it is important to plan the product’s releases so that they can reach the market as early as possible with a competitive level of quality compared to its competitors' products. Hence, quality requirements can be seen as a key competitive advantage. The QUPER model was developed with the aim to support high-level decision-making in release planning of quality requirements. [Question/problem] As a follow up on previous studies on QUPER, this study investigates: What are practitioner's views on the utilities of QUPER extended with guidelines including domain-specific examples? [Principal ideas/results] In the presented case study, a set of detailed guidelines of how to apply QUPER in practice, including how to handle cost dependencies between quality requirements, was evaluated at a case company in the mobile handset domain with 24 professionals using real quality requirements. [Contribution] The results point to the importance of having concrete guidelines combined with instructive examples from real practice, while it is not always obvious for a practitioner to transfer cost-dependency examples into the domains that are different from the example domain. The transferability of guidelines and examples to support methodology adoption is an interesting issue for further research.
8.
  • Blomé, Mikael, 0, et al. (författare)
  • Identifying Time-Consuming Human Modelling Tool Activities
  • 2006
  • Konferensbidrag (refereegranskat)abstract
    • The aim of this study was to identify and measure time-consuming human modelling tool activities. Five human modelling tool users at Volvo were observed for five days each. The results showed a wide distribution of both indirect and direct working tasks, as well as non-value added tasks such as waiting time. Most of the activities identified appear to be necessary to perform human modelling simulations of high quality. However, the time distribution could be questioned to some extent. There are many activities associated with communication, including a variety of contacts and meetings, where there appears to be potential to increase efficiency
9.
  • Blomé, Mikael, 0, et al. (författare)
  • Structured time observation of human modelling tool users' activites
  • 2006
  • Konferensbidrag (refereegranskat)abstract
    • Most statements regarding human modeling tools efficiency are based on perceived time. No structured time observation of task activities performed by a simulation engineers working with the tools are previous performed. The aim of the study is to identify digital human modelling tool users’ activates and measure the time distribution of the activities. Furthermore, measured time distribution is compare with users perceived time distribution. Five simulation engineers at Volvo were observed for five days each. The simulation engineers’ activities can be categorised in twelve groups. The direct value added work and the indirect value added work important for a new introduced tool were of similar size as direct value added work for a vehicle disassembly worker. Waiting time, there simulation is out of control e.g. waiting for information from colleague and computer processor, was perceived much longer compared to measured time. The human modelling tool seems to have matured and most of the activities identified seems to be necessary to perform human modelling simulations of high quality; however the time distribution could to some extend be questioned. There are a lot of activities associated with communication, i.e. different kinds of contacts and meetings. Therefore it appears to be a potential to increase efficiency with respect to communication.
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10.
  • Blomfors, Mattias, 1990-, et al. (författare)
  • Engineering Assessment Method for Anchorage in Corroded Reinforced Concrete
  • 2016
  • Ingår i: IABSE Congress Stockholm, 2016 : Challenges in Design and Construction of an Innovative and Sustainable Built Environment. Report. - IABSE c/o ETH Hönggerberg. - 978-3-85748-144-4 ; s. 2109-2116
  • Konferensbidrag (refereegranskat)abstract
    • There is an increasing need for reliable methods to assess load-carrying capacity and remaining service life of existing infrastructure. Several previous research projects have resulted in a verified, simple 1D model for assessment of anchorage in corroded reinforced concrete structures. Previous verification has involved both experiments and detailed 3D NLFE analyses. To further develop the 1D model it needs to be extended to comprise more practical situations. In order to facilitate an efficient extension procedure in the future, the size of 3D NLFE model that is required to capture the bond behaviour between corroded reinforcement and concrete is investigated. Beam-end models and models of sub-sections were studied, and the results in terms of bond stress and crack pattern were compared. Preliminary results indicate good agreement for some situations; however for some cases a section model seems to overestimate the capacity.
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