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Sökning: WAKA:ref > Chalmers tekniska högskola > (1970-1979) > (1973)

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1.
  • Jeppson, Kjell, 1947-, et al. (författare)
  • A content-addressable memory cell with MNOS transistors
  • 1973
  • Ingår i: IEEE Journal of Solid-State Circuits. - 0018-9200. ; 8:5, s. 338-343
  • Tidskriftsartikel (refereegranskat)abstract
    • Describes a new associative memory cell in which MNOS transistors are used as storage elements. The memory can perform functions as a read-only memory and at the same time as a read-write memory. The cell can be read as a random-access memory or as a content-addressable memory. As a CAM certain bits can be masked out, i.e., not compared with the stored bits. The comparison can also be controlled from the memory by the stored words. Since the word length or combinations of normal words can be stored in one word of the memory, fewer memory cells are needed than in an ordinary memory. Searches for groups of words (prime implicands) can be performed. Memory cells with an area of 5000-m- have been built to demonstrate the feasibility of the MNOS-CAM.
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2.
  • Jonson, Björn, 1941-, et al. (författare)
  • Decay of (86)Rn-210(124) to Levels in (85)at-210(125)
  • 1973
  • Ingår i: Physica Scripta. - 0031-8949. ; 7:4, s. 147-159
  • Tidskriftsartikel (refereegranskat)abstract
    • The decay of 210Rn to 210At has been investigated. Gamma rays were recorded in singles and coincidence using Ge(Li) detectors. Conversion electrons were studied with a Si(Li) detector and a double focusing magnetic spectrometer. Internal conversion coefficients have been deduced and several transition multipolarities have been determined. A decay scheme is presented and spin assignments are made. The electron capture decay from 210Rn has been found to proceed mainly to three levels in 210At: 2 280.8 keV (0-, (1-)), 1 525.5 keV (1+) and 1 488.6 keV (1+), with log ft values <5.5 (L-capture), 7.0, and 7.1, respectively. The nature of these states is discussed. The feeding to the 2 281 keV level is interpreted as a first forbidden beta decay due to either a πh9/2 → νg9/2 or a πs1/2 → νp1/2 transition leading to a [π(h9/23)ν(g9/2p 1/2-2)]0- or a [π(h9/24s1/2-1) ν(p1/2-1)]0 state, respectively. The 1 526 and 1 489 keV states may arise from the π(h9/22|≠0h9/2) ν(f5/2-1) and possibly the π(h9/22f7/2) ν(f5/2-1) configurations. The π(h9/23)ν(p1/2-1) doublet is found at 0 and 72.7 keV. Two levels assigned as members of the π(h9/22|0 h9/2)ν(f5/2-1) configuration are found at 530.9 keV (3+) and 496.1 keV (4+).
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4.
  • Leckner, Bo, 1936- (författare)
  • Some elements of radiative heat transfer calculations in flames and gases
  • 1973
  • Ingår i: Archiwum Procesów Spalania. ; 4:4, s. 377-398
  • Tidskriftsartikel (refereegranskat)abstract
    • The validity of approximations in methods to be used in radiative heat flux calculations in flames and combustion gases is discussed. The principal problem is whether quantities such as emissivity and abrorptivity of gases and soot, defined for homogeneous media, may be employed alsoin media where temperature and concentration vary. Some examples are studied where the approximative methods are compared with resulrs from more refined calculations for carbon dioxide, water vapour and soot-gas mixtures.
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