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  • 1
    Electronic Resource
    Electronic Resource
    Direct imaging of travelling Rayleigh waves by stroboscopic X-ray topography (1982)
    [s.l.] : Nature Publishing Group
    Nature 299 (1982), S. 44-46 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Piezoelectric SAW devices1 are of great technological importance for high-frequency signal processing and filtering applications. Although the presence of crystallographic defects can have deleterious effects on the characteristics of these devices, there has been almost no study of the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/299044a0
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  • 2
    Electronic Resource
    Electronic Resource
    Fermions and octonions (1987)
    Springer
    Communications in mathematical physics 112 (1987), S. 385-408 
    Details
    ISSN: 1432-0916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract We analyse further the algebraic structure of dependent fermions, namely ones interrelated by the vertex operator construction. They are associated with special sorts of lattice systems which are introduced and discussed. The explicit evaluation of the relevant cocycles leads to the result that the operator product expansion of the fermions is related in a precise way to one or another of the division algebras given by complex numbers, quaternions or octonions. The latter case is seen to be realised in the light cone formalism of superstring theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01218483
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  • 3
    Electronic Resource
    Electronic Resource
    Ann monopole solution with 4n — 1 degrees of freedom (1981)
    Springer
    Communications in mathematical physics 80 (1981), S. 575-587 
    Details
    ISSN: 1432-0916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract An exact static monopole solution, possessingn units of magnetic charge and (4n-1) degrees of freedom, is constructed, generalising the recent work of Ward on two monopole solutions. The equations solved are those of anSU(2) gauge theory with adjoint representation Higgs field in the (BPS) limit of vanishing Higgs potential. The number of degrees of freedom is maximal for self-dual solutions. The construction is described in a deductive way, within the framework of the Atiyah-Ward formalism for self-dual gauge fields.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01941665
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  • 4
    Electronic Resource
    Electronic Resource
    Superalgebras, symplectic bosons and the Sugawara construction (1987)
    Springer
    Communications in mathematical physics 112 (1987), S. 591-611 
    Details
    ISSN: 1432-0916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract New representations of affine Lie algebras are constructed using symplectic bosons of the sort that occur naturally in the BRST treatment of fermionic string theories. These representations are shown to have analogous properties to the current algebra representations in terms of free fermion fields, though they do not act in a positive space. In particular, the condition for the Sugawara construction of the Virasoro algebra to equal the free one is the existence of a superalgebra with a quadratic Casimir operator, paralleling the symmetric space theorem for fermionic field constructions. Both results are seen to be particular cases of a more general super-symmetric space theorem, which arises from considering an affinisation of the superalgebras. These algebras are realised in terms of free fermions and symplectic bosons and lead to a super-Sugawara construction of the Virasoro algebra. The conditions for this to equal a Virasoro algebra obtained from the free fields are provided by the super-symmetric space theorem.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01225374
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  • 5
    Electronic Resource
    Electronic Resource
    Unitary representations of the Virasoro and super-Virasoro algebras (1986)
    Springer
    Communications in mathematical physics 103 (1986), S. 105-119 
    Details
    ISSN: 1432-0916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract It is shown that a method previously given for constructing representations of the Virasoro algebra out of representations of affine Kac-Moody algebras yields the full discrete series of highest weight irreducible representations of the Virasoro algebra. The corresponding method for the super-Virasoro algebras (i.e. the Neveu-Schwarz and Ramond algebras) is described in detail and shown to yield the full discrete series of irreducible highest weight representations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01464283
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  • 6
    Electronic Resource
    Electronic Resource
    Vertex operators for non-simply-laced algebras (1986)
    Springer
    Communications in mathematical physics 107 (1986), S. 179-212 
    Details
    ISSN: 1432-0916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract A vertex operator construction is given for the level one representations of the affine Kac-Moody algebras associated with non-simply-laced finite-dimensional Lie algebras, using free boson and interacting fermion fields. The fermion fields are constructed explicitly and a detailed discussion is given of the theory of the cocycles necessary for this and other vertex operator constructions. The construction is related in detail to the folding of Dynkin diagrams and a generalisation of it yields Freudenthal's magic square.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01209391
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  • 7
    Electronic Resource
    Electronic Resource
    Some comments on the ADHM construction in 4k dimensions (1985)
    Springer
    Communications in mathematical physics 100 (1985), S. 1-13 
    Details
    ISSN: 1432-0916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract A class of completely solvable gauge field equations is investigated. These equations are shown to be closely analogous to the four-dimensional self-duality equations. A similar geometrical interpretation is exhibited, and a generalisation of the ADHM construction is shown to provide solutions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01212684
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  • 8
    Electronic Resource
    Electronic Resource
    Accumulation of silver by growing and non-growing populations of Citrobacter intermedius B6 (1989)
    Springer
    Applied microbiology and biotechnology 31 (1989), S. 314-319 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary Accumulation of silver is reported for growing and non-growing populations of Citrobacter intermedius B6. In non-growing cultures a maximum uptake of 4.35% (w/w) was observed at an initial silver concentration of 2111.2 μmol Ag+ l-1. In contrast the maximum uptake of silver by growing bacteria was 2.81% (w/w) at an effective concentration of silver of 217.8 μmol·l-1. Silver accumulation rates in both resting (460 μmol Ag+ g-1 per hour) and continuously grown (41 μmol Ag+ g-1 per hour) bacteria are higher than previously reported. Cell fractionation and electron microscopy of continuously grown bacteria indicated that accumulation of silver was associated with the cell envelope, in the form of dense deposits of macromolecular proportions. This observation discounts simple surface adsorption as the process of accumulation in growing cultures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00258416
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  • 9
    Electronic Resource
    Electronic Resource
    The isolation and characterisation of bacteria capable of accumulating silver (1989)
    Springer
    Applied microbiology and biotechnology 31 (1989), S. 308-313 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary The isolation of silver-resistant, silver-accumulating bacteria is reported. Following the screening of a number of environmental sources, silver-resistant Enterobacteriaceae were isolated from both sewage and photographic processing effluent. The level of resistance to silver and other heavy metals was determined for a selection of these isolates and, together with preliminary accumulation data derived from batch culture studies, one isolate, a strain of Citrobacter intermedius, was selected for further examination. The effect of silver concentration on batch culture growth of this organism was also investigated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00258415
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  • 10
    Electronic Resource
    Electronic Resource
    Foetal scalp mass spectrometer blood-gas transducer (1982)
    Springer
    Medical & biological engineering & computing 20 (1982), S. 375-382 
    Details
    ISSN: 1741-0444
    Keywords: Blood-gas transducers ; Foetal scalp ; Mass spectrometry ; Transducers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract A number of authors have described the design of transducers to be used with mass spectrometers for the skin-surface measurement of gases in newborn infants and adults. We have also previously considered the feasibility of designing a transducer for attachment to the foetal scalp during labour. This paper describes the problems which have been encountered in producing a practical transducer design for foetal scalp use. The major problem has been that of achieving adequate signal-to-noise ratio for the low oxygen levels encountered in the human foetus. A mathematical model is described, and results of the use of the model in optimising critical transducer design parameters are presented. Typical recordings obtained during labour are shown for O2, CO2 and N2O.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02442807
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