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Sökning: LAR1:hh > (1990-1994)

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  • [1]234567...8Nästa
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  • Akujor, Chidi E., et al. (författare)
  • Combined-Array Imaging of Extra-Galactic Radio Sources
  • 1994
  • Ingår i: Astronomy with Millimeter and Submillimeter Wave Interferometry : IAU Colloquium 140 : Meeting held 5-9 October 1992, Hakone, Japan. - San Francisco : Astronomical Society of the Pacific. - 0-937707-78-3 ; s. 123-124
  • Konferensbidrag (refereegranskat)
  • Bengtsson, Lars, 1958-, et al. (författare)
  • A processor array module for distributed, massively parallel, embedded computing
  • 1993
  • Ingår i: Microprocessing and Microprogramming. - Amsterdam : Elsevier. - 0165-6074. ; 38:1-5, s. 529-537
  • Tidskriftsartikel (refereegranskat)abstract
    • With the increased degree of miniaturization resulting from the use of modem VLSI technology and the high communication bandwidth available through optical connections, it is now possible to build massively parallel computers based on distributed modules which can be embedded in advanced industrial products. Examples of such future possibilities are ''action-oriented systems'', in which a network of highly parallel modules perform a multitude of tasks related to perception, cognition, and action. The paper discusses questions of architecture on the level of modules and inter-module communication and gives concrete architectural solutions which meet the demands of typical, advanced industrial real-time applications. The interface between the processors arrays and the all-optical communication network is described in some detail. Implementation issues specifically related to the demand for miniaturization are discussed.
  • Bjurwill, Christer, 1941- (författare)
  • Read and react : The football formula
  • 1993
  • Ingår i: Perceptual and Motor Skills. - Thousand Oaks, CA : Sage Publications. - 0031-5125. ; 76:3_suppl, s. 1383-1386
  • Tidskriftsartikel (refereegranskat)abstract
    • This essay is focused on the problem of vision and intelligence in football (soccer). One-touch play is the type of football that we are to see more often in the future. To prepare the players for such play, both managers and coaches must notice the importance of technical speed and tactical creativity. © Perceptual and Motor Skills 1993 
  • Blomqvist, Jan Einar, 1936- (författare)
  • Innovation engineering Pedagogic strategy of Halmstad University
  • 1992
  • Ingår i: Product development in engineering education : Proceedings. - Halmstad : Halmstad University. - 91-630-1103-4 ; s. 11-18
  • Konferensbidrag (refereegranskat)abstract
    • At small Halmstad University we have, for the past 13 years, a unique educational program in innovation engineering. The three-year educational program provides the candidates with a broad technical and economical education with special emphasise on handling the innovation process and running new product development projects. An optional fourth year, entitled innovation management, focuses on leadership, innovation, and the choices of technology in multinational companies. This is the summing up of 13 years of experience, during which 286 innovation engineers received an education (even if 22% left with one or two unwritten exams).
  • Borgström, Karin Margaretha, 1956- (författare)
  • Determination of the thermal conductivity of the insulation in district heating mains : Field measurements
  • 1994
  • Doktorsavhandling (övrigt vetenskapligt)abstract
    • This thesis concerns the development of a measurement method for determination in the field of the thermal conductivity of the insulation in buried district heating mains. The thermal conductivity of the insulation is calculated from the measured value of the radial heat flow through the heating main, the measured temperature difference across the insulation, and the dimensions of the heating main. The heat flow has been measured with a heat flux sensor which was fitted to the surface of the casing. The temperature has been measured with copper/constantan thermocouples. It is a necessary condition for the method used in the project for determination of the thermal conductivity of the heating main insulation that the heating main is uncovered and is not in contact with the surrounding soil over a distance of about 1.5 m and that the measurements are made directly on the heating main. In this way, no account need be taken of the material surrounding the heating main, nor of the effect of this material on the measurements. No interference is needed with the heating main which would affect the distribution of the district heating water, and the heating main can remain in operation during measurements. Shielding insulation consisting of preformed insulation sections which were placed over the casing of the heating main and covered the heat flux sensor and some of the casing. The function of this insulation was to shield the heat flux sensor from external thermal disturbances. In the field measurements, a copper guard plate of 0.5 mm thickness, the temperature of which could be adjusted, was also placed over the shielding insulation in order to maintain the temperature on the heat flux sensor as constant as possible. When temperature and heat flow are measured, the instruments used will be affected by conditions which prevail at the time of measurement. It is therefore very important to analyse the sources of error which may arise in the measuring situation at hand. The effect of these factors on the measured values has been studied by ' laboratory measurements ' theoretical calculations ' field measurements On the basis of the resulting values of heat flows and temperatures obtained in field measurements on plastic heating mains which were operating under normal conditions, the thermal conductivity of the insulation of the main has been estimated. The method has been tested on plastic heating mains with directly foamed insulation, since this is the most common type of heating main both in the existing district heating network and in new construction. The measuring method can also be used on other circular heating mains.  
  • Borkowski, Kazimierz M., et al. (författare)
  • Determination of the Toruń Antenna Position from VLBI Observations
  • 1992
  • Ingår i: Acta Astronomica. - Warsaw : Fundacja Astronomii Polskiej im. Mikolaja Kopernika / Copernicus Foundation for Polish Astronomy. - 0001-5237. ; 42, s. 371-375
  • Tidskriftsartikel (refereegranskat)abstract
    • Four strong radio sources were observed over a 12-hr session in March, 1990 between radio telescopes at Onsala and Torun at wavelength of 6 cm in the standard VLBI Mark II setup for the purpose of improving the coordinates of the Torun 15-meter antenna. The Cartesian coordinates of the antenna derived from the presented measurements are (in meters): 3638609.62 +/- 0.19, 1221773.23 +/- 0.54 and 5077024.50 +/- 1.66 in the x, y, and z directions, respectively.
  • Brönmark, Christer, et al. (författare)
  • Indirect effects of fish community structure on submerged vegetation in shallow, eutrophic lakes : an alternative mechanism
  • 1992
  • Ingår i: Hydrobiologia. - Dordrecht : Springer Netherlands. - 0018-8158. ; 243/244:1, s. 293-301
  • Tidskriftsartikel (refereegranskat)abstract
    • The loss of submerged macrophytes during eutrophication of shallow takes is a commonly observed phenomenon. The proximate reason for this decline is a reduction of available light due to increasing phytoplankton and/or epiphyton biomass. Here we argue that the ultimate cause for the transition from a macrophyte-dominated state to a phytoplankton-dominated state is a change in fish community structure. A catastrophic disturbance event (e.g. winterkill) acting selectively on piscivores, cascades down food chains, eventually reducing macrophyte growth through shading by epiphyton, an effect that is reinforced by increasing phytoplankton biomass. The transition back from the phytoplankton to the macrophyte state depends on an increase in piscivore standing stock and a reduction of planktivores. A conceptual model of these mechanisms is presented and supported by literature data and preliminary observations from a field experiment. © 1992 Kluwer Academic Publishers.
  • Bååth, L.B., 1948-, et al. (författare)
  • 0735+178 : The cosmic conspiracy
  • 1991
  • Ingår i: Astronomy and Astrophysics. - Les Ulis : EDP Sciences. - 0004-6361. ; 250:1, s. 50-56
  • Tidskriftsartikel (refereegranskat)abstract
    • This paper discusses a radio outburst in the BL Lac-object 0735+178 which started in early 1988, ended during 1990 and was succeeded by a new outburst which is still in progress. Our image obtained with a global VLBI network shows the source to mainly consist of a core-jet like structure ending in diffuse emission region of low surface brightness located to the east of the core. We identify two new components as having been produced during the late 1980's. They are moving out with apparent superluminal motion in a viewing angle of greater-than-or-similar-to 10-degrees at a distance of less-than-or-similar-to 2 mas from the core. The core includes another new component, but our resolution is just sufficient to resolve out this component from the core at our epoch of observation. We suggest that the weak emission region is caused by an older component reaching the point at which the Doppler boosting is at its maximum and that the long time scale flux variation are due to successive events when evolved components reach that point.
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  • [1]234567...8Nästa
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