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  • 1
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 130-132 (Jan. 1993), p. 349-372 
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Fluid Mechanics 24 (1992), S. 313-358 
    ISSN: 0066-4189
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 64 (1993), S. 952-957 
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The accuracy of the calibration of a Mott polarimeter with a recently suggested method that uses an auxiliary target is compared with the accuracy obtained with the classical double-scattering experiment in its improved form. It turns out that the former method is affected by depolarization of the polarized incident beam in the auxiliary target. This systematic error source can, however, be eliminated by performing an additional asymmetry measurement.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 61 (1990), S. 3399-3404 
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Recent advances in polarized-electron sources had the consequence that the accuracy of many experiments with polarized electrons is no longer limited by statistics, but rather by the uncertainty in polarization analysis by Mott scattering. One of the reasons for this uncertainty is spurious asymmetries that are caused by a small misalignment of the polarized beam. This article discusses how spurious asymmetries can be corrected for by proper use of monitor counters. It is shown that such a correction requires proper positioning of the monitor counters. A method of finding and checking the correct analyzer arrangement is given. The result is a polarization measurement with high reproducibility and accuracy.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 695 (1993), S. 0 
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Notes: Forty patients with probable Alzheimer's disease (AD) were selected from a pool of 80 patients and assigned to 4 groups. Each received either social support, cognitive training only, or cognitive training in combination with pyritinol or phosphatidylserine. Treatment duration was 6 months. Before and after treatment the patients underwent neuropsychological testing as well as measurement of the regional cerebral metabolic rate for glucose using positron emission tomography (PET) and 2[18F]-fluoro-2-deoxy-D-glucose (FDG). Before treatment, the groups were comparable in respect to resting and activated glucose pattern achieved by a visual recognition task. They did not differ in scores of a neuropsychological test battery. After the treatment period the group with cognitive training + phosphatidylserine showed a significant glucose enhancement during the stimulation tasks in various brain regions, and an improvement in cognitive functioning compared to the other groups. The group with cognitive training + pyritinol had better stimulation effect as that of the social support group indicating that a combination of cognitive training + pharmacological intervention was superior than that of cognitive training alone.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1432-1459
    Keywords: Progressive supranuclear palsy ; Basal ganglia ; Metabolism ; Positron emission tomography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Regional cerebral glucose metabolism was studied in nine patients with progressive supranuclear palsy (PSP). (18F)-2-fluoro-2-deoxy-d-glucose (FDG) positron emission tomography (PET) revealed general cerebral hypometabolism in all PSP patients in comparison with an age-matched reference group. When comparing the degree of regional metabolic deterioration, a consistent pattern of the most affected brain regions became obvious: the strongest significant alteration of cerebral glucose metabolism was observed in subcortical regions, e.g. in caudate nucleus, lentiform nucleus and upper mid-brain, which showed nerve cell loss in previous pathological studies. Less severe, but still significant hypometabolism was observed in frontal cortex. This pattern of hypometabolism was distinctly different from that typically seen in dementias of Alzheimer's type. The present data show that PET findings agree with histopathological studies: PSP is a primarily subcortical disease with secondary inactivation of cortical, especially of frontal brain regions.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1432-1106
    Keywords: Swallowing ; Nucleus tractus solitarius ; Excitatory amino acids ; Ketamine anesthesia ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Swallowing is a patterned motor activity generated by neurons located within the nucleus tractus solitarius (NTS). An excitatory amino acid (EAA) neurotransmitter, such as glutamate (GLU), is suspected of being involved in the initiation of swallowing by NTS neuronal components. However, swallowing can still be elicited in animals anesthetized with ketamine, an antagonist of the N-methyl-D-aspartate (NMDA) subclass of EAA receptors. The present experiments were therefore designed to investigate the influence of EAA administration within the NTS on the swallowing motor acitivity of rats anesthetized with ketamine. Pressure microinjections of GLU in doses ranging from 25 to 500 pmol elicited swallowing. This effect was dose-dependent and was not reproduced when control injections of the vehicle solution were performed. Microinjections of the GLU agonists, quisqualate (QUIS) and NMDA, in doses ranging between 2.5 and 50 pmol, also induced swallowing motor activities. QUIS, like GLU, elicited a short series of swallows at a brief latency while NMDA generated long-lasting rhythmic swallowing with a longer latency. Swallowing induced by GLU microinjections (100 pmol) was suppressed almost completely by local pretreatment with either the broad spectrum EAA receptor antagonist, gamma-D-glutamylglycine (250 pmol), or the more selective non-NMDA antagonist, 6-cyano-7-nitroquinoxaline-2,3-dione (50–100 pmol), but not by pretreatment with the selective NMDA antagonist, DL-2-amino-5-phosponovalerate (250 pmol). On the other hand, pretreatment with DL-2-amino-5-phosphonovalerate (50 pmol) suppressed the deglutitions induced by NMDA microinjections (10 pmol) but not those elicited by QUIS microinjections (10 pmol). These results provide evidence that swallowing can be induced by activation of EAA receptors of both the NMDA and the non-NMDA subclasses located within the NTS. Furthermore they indicate that both subclasses may still be active in ketamine-anesthetized animals.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Agroforestry systems 17 (1992), S. 97-118 
    ISSN: 1572-9680
    Keywords: West African parkland savanna ; tree-crop relations ; tree management ; shade influence ; Vitellaria paradoxa ; Parkia biglobosa
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Résumé Les rendements en graines de sorgho sous le karité et le néré sont respectivement environ 50% et 70% plus basses que celles hors des houppiers. La fertilité du sol, étant le facteur limitant pour la production primaire dans la région, est au moins assez favorable sous les arbres que hors des houppiers. L'ombre sous les arbres, réduisant la lumière sous le néré à 20% au minimum, est probablement largement responsable pour la réduction des rendements sous les arbres. Les profits par la vente des produits des arbres sont plus élevés que les pertes de rendements céréaliers, ce qui explique pourqoui les arbres sont conservés dans les champs. La taille des branches, la selection des cultures qui résistent l'ombre et la selection des arbres peuvent réduire les pertes de rendements, mais n'auront pas un grand effet sur la productivité des arbres ni des cultures.
    Notes: Abstract Sorghum grain yields under the karité and the néré are reduced by an average of 50% and 70% respectively, in comparison with yields in the open field. Soil fertility, limiting primary production in the region, is at least as favorable under the tree canopies as in the open field. Reduced light intensity, to a minimum of 20% under the néré canopy, is probably largely responsible for low sorghum production under the tree canopies. Benefits from the tree products are more valuable than losses in cereal yields, explaining why trees are maintained on the agricultural fields. Pruning of tree branches, selection of (shade-) crops and tree selection could reduce crop yield losses but cannot be expected to increase tree- and crop production.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Mathematical methods of operations research 35 (1991), S. 321-345 
    ISSN: 1432-5217
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Notes: Abstract The cast-plate-method of manufacturing acrylic-glass gives raise to a batch scheduling problem on parallel processing units. This paper introduces the real world problem as well as an appropriate mathematical programming formulation. We describe a heuristical approach for gaining production sequences that employ the parallel processing units to capacity.
    Type of Medium: Electronic Resource
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