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  • Electronic Resource  (31)
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  • Electronic Resource  (31)
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  • 1
    Electronic Resource
    Electronic Resource
    Superfield actions for N=2 degenerate central charges (1985)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 26 (1985), S. 345-351 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: We construct the superfield actions for degenerate (spin-reducing) multiplets of N=2 extended supersymmetry as integrals over all superspace. This requires the integration over the two available central charges as well. We evaluate the detailed component contributions to these actions and show they are total derivatives with respect to central charge dimensions. The resulting spectrum of the theories are analyzed in four dimensions in terms of various boundary conditions in the higher dimensions and the nature of the integration domain.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.526666
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  • 2
    Electronic Resource
    Electronic Resource
    On extensions of supersymmetry algebras in d=4 and 11 (1985)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 26 (1985), S. 2659-2665 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: SUSY algebras, in d=4 and 11, are analyzed, extended by the addition of both spinorial and bosonic central charge generators. It is found that only limited extensions are possible, on use of Jacobi identities. Casimirs, irreps, and spin reduction are discussed, and the problems of constructing actions for SUSY and supergravity theories as full superspace actions are considered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.526734
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  • 3
    Electronic Resource
    Electronic Resource
    Absolute Counting of Sulfur-35 (1960)
    s.l. : American Chemical Society
    Analytical chemistry 32 (1960), S. 310-313 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac60159a003
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Decay of Cesium137 Determined by Absolute Counting Methods. (1965)
    s.l. : American Chemical Society
    Analytical chemistry 37 (1965), S. 351-354 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac60222a011
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Network analysis in episodic encoding and retrieval of word-pair associates: a PET study (1999)
    Oxford, UK : Blackwell Science Ltd
    European journal of neuroscience 11 (1999), S. 0 
    Details
    ISSN: 1460-9568
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The involvement of distributed brain regions in declarative memory has been hypothesized based on studies with verbal memory tasks. To characterize episodic declarative memory function further, 14 right-handed volunteers performed a visual verbal learning task using paired word associates. The volunteers underwent positron emission tomography. 15O-butanol was used as a tracer of regional cerebral blood flow (rCBF). Inter-regional functional interactions were assessed based on within-task, across-subject inter-regional rCBF correlations. Anatomical connections between brain areas were based on known anatomy. Structural equation modelling was used to calculate the path coefficients representing the magnitudes of the functional influences of each area on the ones to which it is connected by anatomical pathways. The encoding and the retrieval network elicit similarities in a general manner but also differences. Strong functional linkages involving visual integration areas, parahippocampal regions, left precuneus and cingulate gyrus were found in both encoding and retrieval; the functional linkages between posterior regions and prefrontal regions were more closely linked during encoding, whereas functional linkages between the left parahippocampal region and posterior cingulate as well as extrastriate areas and posterior cingulate gyrus were stronger during retrieval. In conclusion, these findings support the idea of a global bihemispheric, asymmetric encoding/retrieval network subserving episodic declarative memory. Our results further underline the role of the precuneus in episodic memory, not only during retrieval but also during encoding.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1460-9568.1999.00723.x
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  • 6
    Electronic Resource
    Electronic Resource
    Can electromagnetism account for extra-sensory phenomena? (1978)
    [s.l.] : Nature Publishing Group
    Nature 276 (1978), S. 64-67 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Earlier work on EM signals related to ESP has been inconclusive. Cazzamali2 proposed an EM explanation of telepathy by means of waves of 10 cm-1 m in wavelength, and he claimed to have detected such emission. These results were never confirmed. Vasiliev3 concluded that telepathy could not be ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/276064a0
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  • 7
    Electronic Resource
    Electronic Resource
    Do black holes really explode? (1974)
    [s.l.] : Nature Publishing Group
    Nature 250 (1974), S. 37-38 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Nevertheless, during the collapse of a spherically symmetric object, the metric near the surface will be changing rapidly on a time scale of T ~ 10-5 (M/M®) s, so that on general grounds the production of massless particles with energy of order h/? is expected. Many of these particles will escape ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/250037a0
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  • 8
    Electronic Resource
    Electronic Resource
    Is there any scientific explanation of the paranormal? (1979)
    [s.l.] : Nature Publishing Group
    Nature 279 (1979), S. 631-633 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] We will start our analysis by applying a criterion to which psychic phenomena and its explanations must conform, that of the conservation of energy (stemming as it does from the underlying symmetry of the forces of nature). From energy conservation we may roughly assess the amount of energy ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/279631a0
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  • 9
    Electronic Resource
    Electronic Resource
    A general model of stochastic neural processing (1990)
    Springer
    Biological cybernetics 63 (1990), S. 299-306 
    Details
    ISSN: 1432-0770
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Computer Science , Physics
    Notes: Abstract A model of neural processing is proposed which is able to incorporate a great deal of neurophysiological detail, including effects associated with the mechanics of postsynaptic summation and cell surface geometry and is capable of hardware realisation as a ‘probabilistic random access memory’ (pRAM). The model is an extension of earlier work by the authors, which by operating at much shorter time scales (of the order of the lifetime of a quantum of neurotransmitter in the synaptic cleft) allows a greater amount of information to be retrieved from the simulated spike train. The mathematical framework for the model appears to be that of an extended Markov process (involving the firing histories of the N neurons); simulation work has yielded results in excellent agreement with theoretical predictions. The extended neural model is expected to be particularly applicable in situations where timing constraints are of special importance (such as the auditory cortex) or where firing thresholds are high, as in the case for the granule and pyramidal cells of the hippocampus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00203453
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  • 10
    Electronic Resource
    Electronic Resource
    A global competitive neural network (1995)
    Springer
    Biological cybernetics 72 (1995), S. 233-248 
    Details
    ISSN: 1432-0770
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Computer Science , Physics
    Notes: Abstract.  A study is presented of a set of coupled nets proposed to function as a global competitive network. One net, of hidden nodes, is composed solely of inhibitory neurons and is excitatorily driven and feeds back in a disinhibitory manner to an input net which itself feeds excitatorily to a (cortical) output net. The manner in which the former input and hidden inhibitory net function so as to enhance outputs as compared with inputs, and the further enhancements when the cortical net is added, are explored both mathematically and by simulation. This is extended to learning on cortical afferent and lateral connections. A global wave structure, arising on the inhibitory net in a similar manner to that of pattern formation in a negative laplacian net, is seen to be important to all of these activities. Simulations are only performed in one dimension, although the global nature of the activity is expected to extend to higher dimensions. Possible implications are briefly discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004220050127
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