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  • 21
    Electronic Resource
    Electronic Resource
    The massless Thirring model: Positivity of Klaiber'sn-point functions (1985)
    Springer
    Communications in mathematical physics 99 (1985), S. 347-364 
    Details
    ISSN: 1432-0916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract We present a simple solution to the problem of proving positivity of Klaiber'sn-point functions for the massless Thirring model. The corresponding fields are obtained as strong limits of explicitly given approximate fields, obviating reconstruction. By invoking recent results on the boson-fermion correspondence it is shown how the model can be formulated on the charged fermion Fock space. It is pointed out that the question of cyclicity of the vacuum is open, and that an affirmative answer is necessary to confirm the superselection sector picture of the model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01240352
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  • 22
    Electronic Resource
    Electronic Resource
    The Multi-form Generalised Gleason Theorem (1998)
    Springer
    Communications in mathematical physics 198 (1998), S. 705-709 
    Details
    ISSN: 1432-0916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract: Arising from investigations of decoherence functionals in the “histories” approach to quantum mechanics, the following result is given by the methods of [14]. Let A 1 and A 2 be von Neumann algebras without Type I 2 direct summands and let P(E j ), (j=1,2) be their lattices of projections. Let m\colon; P(A 1)×(P(A 2)→ℂ be a bounded quantum bi-measure. Then there is a unique bounded bilinear functional M on A 1×A 2 which extends m. In this note we use a different approach to establish a generalisation of this result to k-fold, vector valued, quantum multi-measures. This tool is needed for further investigations of decoherence functionals in quantum theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002200050491
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  • 23
    Electronic Resource
    Electronic Resource
    Homogeneous Decoherence Functionals¶in Standard and History Quantum Mechanics (1999)
    Springer
    Communications in mathematical physics 204 (1999), S. 249-267 
    Details
    ISSN: 1432-0916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract: General history quantum theories are quantum theories without a globally defined notion of time. Decoherence functionals represent the states in the history approach and are defined as certain bivariate complex-valued functionals on the space of all histories. However, in practical situations – for instance in the history formulation of standard quantum mechanics – there often is a global time direction and the homogeneous decoherence functionals are specified by their values on the subspace of homogeneous histories. In this work we study the analytic properties of (i) the standard decoherence functional in the history version of standard quantum mechanics and (ii) homogeneous decoherence functionals in general history theories. We restrict ourselves to the situation where the space of histories is given by the lattice of projections on some Hilbert space ℋ. Among other things we prove the non-existence of a finitely valued extension for the standard decoherence functional to the space of all histories, derive a representation for the standard decoherence functional as an unbounded quadratic form with a natural representation on a Hilbert space and prove the existence of an Isham–Linden–Schreckenberg (ILS) type representation for the standard decoherence functional.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002200050645
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  • 24
    Electronic Resource
    Electronic Resource
    Quantum measures and states on Jordan algebras (1985)
    Springer
    Communications in mathematical physics 98 (1985), S. 187-202 
    Details
    ISSN: 1432-0916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract A problem of Mackey for von Neumann algebras has been settled by the conjunction of the early work of Gleason and the recent advances of Christensen and Yeadon. We show that Mackey's conjecture holds in much greater generality. LetA be a JBW-algebra and letL be the lattice of all projections inA. A quantum measure onL is a countably additive map,m, fromL into the real numbers. Our results imply thatm always has a unique extension to a bounded linear functional onA, provided thatA has no TypeI 2 direct summand.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01220507
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  • 25
    Electronic Resource
    Electronic Resource
    Quantum logics and convex geometry (1985)
    Springer
    Communications in mathematical physics 101 (1985), S. 87-96 
    Details
    ISSN: 1432-0916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract The main result is a representation theorem which shows that, for a large class of quantum logics, a quantum logic,Q, is isomorphic to the lattice of projective faces in a suitable convex setK. As an application we extend our earlier results [4], which, subject to countability conditions, gave a geometric characterization of those quantum logics which are isomorphic to the projection lattice of a von Neumann algebra or aJ B W-algebra.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01212357
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  • 26
    Electronic Resource
    Electronic Resource
    Sol-gel composites for optical sensing of solvents (1997)
    Springer
    Journal of sol gel science and technology 8 (1997), S. 1127-1132 
    Details
    ISSN: 1573-4846
    Keywords: sensors ; cyclodextrin ; fluorescence ; solvents
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Porous sol-gel glasses containing entrapped fluorescent-labelled β-cyclodextrin have been prepared from tetramethylorthosilicate (TMOS). Small non-polar solvent molecules such as cyclohexane and toluene displace the fluorescent label from the cyclodextrin cavity, and the resulting decrease in fluorescence intensity is proportional to the solvent vapour concentration in the range 40–100 ppm, and is reversible. Polar solvents such as acetone give no response. Strategies for optimisation of the system are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02436995
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  • 27
    Electronic Resource
    Electronic Resource
    Productive performance of cattle in Botswana (1974)
    Springer
    Tropical animal health and production 6 (1974), S. 1-21 
    Details
    ISSN: 1573-7438
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Une enquête a été effectuée dans plusieurs régions du Botswana pour déterminer comment l'exploitation, l'environnement et l'aphosphorose influençaient la condition physique et les facultés reproductrices du bétail nomade de ces régions. Les résultats montrent qu'une médiocre exploitation, le surpàturage et de faibles possibilités d'abreuvement diminuaient sérieusement la condition physique et les facultés reproductrices. Une bonne conduite aide beaucoup à améliorer la situation. L'aphosphorose s'observe dans quelques régions mais elle paraît être étroitement liée à la malnutrition.
    Abstract: Sumario Sellevó a cabo una investigación de campo en varias areas en Botswana para determinar como el manejo, ambiente y posiblemente la afosforosis afectaban la condición corporal y la performance reproductiva del ganado en pastoreo en estas areas. Los resultados indicaron que el manejo pobre, el sobrepastoreo y la pobreza de agua afectaron seriamente la condición corporal y el rendimiento reproductivo. El buen manejo ayuda enormemente en mejorar la situacion. La afosforosis ocurre en algunas areas pero parece estar estrechamente ligada a la malnutricion.
    Notes: Summary A field investigation was undertaken in several areas of Botswana to determine how management, environment and possibly aphosphorosis affected the bodily condition and reproductive performance of range cattle in these areas. Results indicated that poor management, overgrazing and poor watering facilities seriously impaired bodily condition and reproductive performance. Good management helps greatly to improve the situation. Aphosphorosis does occur in some areas but appears to be closely linked with malnutrition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02380743
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  • 28
    Electronic Resource
    Electronic Resource
    A note on seasonal changes in serum inorganic phosphate levels of cattle in Botswana (1974)
    Springer
    Tropical animal health and production 6 (1974), S. 37-38 
    Details
    ISSN: 1573-7438
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé On prétend que l'aphosphorose est générale dans les régions de veld sableux du Botswana mais la preuve objective n'en a jamais été faite. Une étude das taux de phosphate inorganique du sérum (SIP) de vaches a été effectuée en saison sèche (septembre à octobre) et après les pluies (février) quand l'herbe était haute et verte. La différence était hautement significative entre les taux de SIP au cours des deux saisons.
    Abstract: Sumario La afosforosis es considerada estar bastante diseminada en areas arenosas de Botswana aunque no existe evidencia de apoyo mas objetiva. Se hizo un examen de los niveles de fosfato inorgánico en los sueros de vacas en la estación seca (Setiembre-Octubre) y otra vez despues de las lluvias (Febrero) cuando el grass esta crecido y es verde. La differencia en los niveles de estos fosfatos inorgánicos en los dos periodos fue altamente significativa.
    Notes: Summary Aphosphorosis is alleged to be widespread in the sandveld areas of Botswana although supportive objective evidence is not available. An examination was made of serum inorganic phosphate (SIP) levels of cows in the dry season (September–October) and again after the rains (February) when the grass was tall and green. The difference in SIP levels between the two periods was highly significant.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02380746
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  • 29
    Electronic Resource
    Electronic Resource
    Serum inorganic phosphate, calcium and magnesium levels of cattle in Botswana (1974)
    Springer
    Tropical animal health and production 6 (1974), S. 23-29 
    Details
    ISSN: 1573-7438
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Les taux de phosphate inorganique dans le sérum du bétail du Botswana sont régulièrement faibles à la fin de la saison sèche. Les taux varient d'une zone à l'autre mais ce n'est que dans quelques régions qu'ils sont compatibles avec ceux qui sont observés dans l'aphosphorose. Its sont les plus bas dans les régions à maigre pâturage mais les faibles taux sériques ne sont pas forcément associés à des signes cliniques d'aphosphorose. Des suppléments de farine d'os augmentent les taux sériques et leur effet est le plus net quand les animaux disposent d'un bon pâturage.
    Abstract: Sumario Los niveles de fosfato inorganico en el suero de ganado en Botswana al final de la estación seca estuvieron en el limite normal inferior. Los niveles variaron de una area a otra y solo en algunas aresa los niveles eran compatibles con aquellos vistos en afosforosis. Los niveles mas bajos fueron vistos en areas de pastoreo pobre pero niveles reducidos en el suero no estaban necesariamente asociados con síntomas clínicos de afosforosis. Suplementos de harina de hueso incrementaron los niveles de fosfato inorganico en el suero y el efecto era mucho mas marcado cuando los animales tenían buena capacidad para el pastoreo.
    Notes: Summary Serum inorganic phosphate levels in Botswanan cattle at the end of the dry season were in the low normal range. Levels varied from one area of the country to another and only in some areas were the levels compatible with those seen in aphosphorosis. Levels were lowest in areas with poor grazing but low serum levels were not necessarily associated with clinical signs of aphosphorosis. Bonemeal supplements increased serum inorganic phosphate levels and its effect was most marked when animals had good grazing available.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02380744
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  • 30
    Electronic Resource
    Electronic Resource
    Fungal degradation of benzoic acid and related compounds (1993)
    Springer
    World journal of microbiology and biotechnology 9 (1993), S. 9-16 
    Details
    ISSN: 1573-0972
    Keywords: Aromatics ; benzoic acids ; dioxygenases ; fungi ; ring-cleavage enzymes ; yeasts
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Most knowledge of the degradation of aromatic compounds has been gained through investigation of the pathways in bacteria. In recent years, however, significant developments have been made in the understanding of the degradation of these compounds in yeasts and moulds. Many similarities have been identified between the bacteria and the yeasts and moulds but some significant differences occur. This review highlights these differences and discusses the current understanding of the fungal degradation of benzoate and some substituted benzoates. The pathways for the further conversion of the ring-fission substrates, which are common to all fungi capable of degrading these aromatic compounds, are also presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00656508
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