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| 2. |
- Bruzzi, M, et al.
(författare)
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Radiation-hard semiconductor detectors for SuperLHC
- 2005
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Ingår i: Nuclear Instruments & Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment. - : Elsevier BV. - 0167-5087 .- 0168-9002. ; 541:1-2, s. 189-201
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Tidskriftsartikel (refereegranskat)abstract
- An option of increasing the luminosity of the Large Hadron Collider (LHC) at CERN to 1035 cm-2 s-1 has been envisaged to extend the physics reach of the machine. An efficient tracking down to a few centimetres from the interaction point will be required to exploit the physics potential of the upgraded LHC. As a consequence, the semiconductor detectors close to the interaction region will receive severe doses of fast hadron irradiation and the inner tracker detectors will need to survive fast hadron fluences of up to above 1016cm-2. The CERN-RD50 project "Development of Radiation Hard Semiconductor Devices for Very High Luminosity Colliders" has been established in 2002 to explore detector materials and technologies that will allow to operate devices up to, or beyond, this limit. The strategies followed by RD50 to enhance the radiation tolerance include the development of new or defect engineered detector materials (SiC, GaN, Czochralski and epitaxial silicon, oxygen enriched Float Zone silicon), the improvement of present detector designs and the understanding of the microscopic defects causing the degradation of the irradiated detectors. The latest advancements within the RD50 collaboration on radiation hard semiconductor detectors will be reviewed and discussed in this work.
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| 3. |
- Bien, Jan, et al.
(författare)
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Demonstration bridge C: Masonry Arch Structure : Sustainable Bridges Background document 7.4
- 2007
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Rapport (refereegranskat)abstract
- The bridge was selected as a typical masonry arch bridge for demonstration and testing of the project achievements. The age (built 1875), construction and span length (arch radius 4,97 m) of the structure are representative for masonry bridges in Europe. The bridge also doesn't have any technical documentation as most of old masonry bridges. From the practical point of view it is interesting that the track in service is placed asymmetrically, just on one side of the bridge.Within the works performed on the bridge the following activities can be distinguished:• NDT testing of the structure geometry and material in situ,• Laboratory test of specimens taken form the structure,• Numerical analyses for evaluation of the bridge load capacity and the ultimate load.
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| 5. |
- Dimou, Konstantinos, et al.
(författare)
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Generic link layer : A solution for multi-radio transmission diversity in communication networks beyond 3G
- 2005
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Ingår i: VTC2005-FALL. - 0780391527 ; , s. 1672-1676
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Konferensbidrag (refereegranskat)abstract
- Communication systems beyond 3G (B3G) will consist of a mixture of radio access technologies. For such systems the challenge is to provide a multi-radio access architecture that facilitates the interconnection of heterogeneous radio access networks and supports efficiently the various services. Achieving this interconnection in a transparent way for users and services requires extensions at link layer level. The Generic Link Layer (GLL), as proposed in the context of the Ambient Networks (AN) project addresses this challenge. The principal role of GLL within the AN multi-radio access architecture is to integrate different Radio Access Technologies (RATs) at the link layer and to facilitate their efficient interworking. A feature that is enabled by the use of GLL is termed multi-radio transmission diversity (MRTD). It implies a well-defined split of a data-flow over the available RATs; the main benefits thereby are gain in user QoS, in spectral efficiency and in robustness. In this paper we give the system architecture and the GLL functions required for the realization of MRTD. Then, the specific scenario of cooperation between UMTS and IEEE 802.11 is discussed.
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| 6. |
- Gashi, S, et al.
(författare)
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Curvature and wrinkling of premixed flame kernels - comparisons of OHPLIF and DNS data
- 2005
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Ingår i: Symposium (International) on Combustion. - : Elsevier BV. - 0082-0784. ; 30, s. 809-817
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Tidskriftsartikel (refereegranskat)abstract
- The effects of curvature and wrinkling on the growth of turbulent premixed flame kernels have been investigated using both 2D OH planar laser-induced fluorescence (PLIF) and 3D direct numerical simulation (DNS). Comparisons of results between the two approaches show a high level of agreement, providing confidence in the simplified chemistry treatment employed in the DNS, and indicating that chemistry may have only a limited influence on the evolution of the freely propagating flame. This is in contrast to previous studies of the very early flame development where chemistry may be dominant. Statistics for curvature and wrinkling are presented in the form of probability density functions, and there is good agreement with previous findings. The limitations of 2D PLIF measurements of curvature are quantified by comparison with full 3D information obtained from the DNS. The usefulness of PLIF in providing data over a wide parameter range is illustrated using statistics obtained from both CH4/air and H-2/air mixtures, which show a markedly different behaviour due to their different thermo-diffusive properties. The results provide a demonstration of the combined power of PLIF and DNS for flame investigation. Each technique is shown to compensate for the weaknesses of the other and to reinforce the strengths of both.
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| 8. |
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| 9. |
- Grenmyr, Gustav, 1982, et al.
(författare)
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Analysis of Tool Wear in CGI Machining
- 2008
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Ingår i: Proceedings of International Multi-Conference on Engineering and Technological Innovation, June 29th - July 2nd, 2008 – Orlando, Florida, USA. ; Volume I, s. 34-39
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Konferensbidrag (refereegranskat)
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| 10. |
- Nayyar, Varun, 1981, et al.
(författare)
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Machinability of Compacted Graphite Iron (CGI), a Microstructural and Mechanical Properties Comparison Approach
- 2009
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Ingår i: Swedish Production Symposium 09.
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Konferensbidrag (refereegranskat)abstract
- Compacted Graphite Iron (CGI) has an important role in manufacturing of new generation engines. Better strength of CGI allows engines to perform at higher pressure and also to have better efficiency with lower emission rate. The machinability of CGI is an area that needs to be studied in a better way to cut the production cost of the engine. It is a well know fact that the as-cast engine block has varying microstructure and mechanical properties due to different cooling rates at different locations of such a geometrically complex component. This has highlighted the need for studying machinability as a function of microstructural and mechanical properties so that the machining process could be optimized. For this reason, machinability of 18 different types of CGI materials along with two Gray Cast Iron (GCI) materials has been studied in turning operation. A model for relating tool life to the mechanical properties of CGI has been developed and the machinability of the different CGIs has also been compared with grey cast iron (GCI) for reference. The criteria used for comparison of machinability are tool life and cutting forces. When machining CGI, the tool life is found to decrease drastically with increase in hardness, ultimate tensile strength and pearlite content. The highest tool life is almost 6 times of the least tool life noticed out for the 18 different types of CGI. The best tool life given by CGI is still almost half of that for the GCI reference material, although the force value measured for GCI was comparatively higher than for some of the CGI materials.
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