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  • Articles  (44)
  • Springer  (41)
  • Blackwell Publishing Ltd  (3)
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  • Articles  (44)
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  • 1
    Electronic Resource
    Electronic Resource
    A multipoint study of a substorm occurring on 7 December, 1992, and its theoretical implications (1999)
    Springer
    Annales geophysicae 17 (1999), S. 1369-1384 
    Details
    ISSN: 0992-7689
    Keywords: Ionosphere (auroral ionosphere; plasma convection) ; Magnetospheric physics (storms and substorms)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract On 7 December 1992, a moderate substorm was observed by a variety of satellites and ground-based instruments. Ionospheric flows were monitored near dusk by the Goose Bay HF radar and near midnight by the EISCAT radar. The observed flows are compared here with magnetometer observations by the IMAGE array in Scandinavia and the two Greenland chains, the auroral distribution observed by Freja and the substorm cycle observations by the SABRE radar, the SAMNET magnetometer array and LANL geosynchronous satellites. Data from Galileo Earth-encounter II are used to estimate the IMF Bz component. The data presented show that the substorm onset electrojet at midnight was confined to closed field lines equatorward of the pre-existing convection reversal boundaries observed in the dusk and midnight regions. No evidence of substantial closure of open flux was detected following this substorm onset. Indeed the convection reversal boundary on the duskside continued to expand equatorward after onset due to the continued presence of strong southward IMF, such that growth and expansion phase features were simultaneously present. Clear indications of closure of open flux were not observed until a subsequent substorm intensification 25 min after the initial onset. After this time, the substorm auroral bulge in the nightside hours propagated well poleward of the pre-existing convection reversal boundary, and strong flow perturbations were observed by the Goose Bay radar, indicative of flows driven by reconnection in the tail.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s00585-999-1369-6
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  • 2
    Electronic Resource
    Electronic Resource
    EISCAT observations of unusual flows in the morning sector associated with weak substorm activity (1994)
    Springer
    Annales geophysicae 12 (1994), S. 541-553 
    Details
    ISSN: 0992-7689
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract A discussion is given of plasma flows in the dawn and nightside high-latitude ionospheric regions during substorms occurring on a contracted auroral oval, as observed using the EISCAT CP-4-A experiment. Supporting data from the PACE radar, Greenland magnetometer chain, SAMNET magnetometers and geostationary satellites are compared to the EISCAT observations. On 4 October 1989 a weak substorm with initial expansion phase onset signatures at 0030 UT, resulted in the convection reversal boundary observed by EISCAT (at \sim0415 MLT) contracting rapidly poleward, causing a band of elevated ionospheric ion temperatures and a localised plasma density depletion. This polar cap contraction event is shown to be associated with various substorm signatures; Pi2 pulsations at mid-latitudes, magnetic bays in the midnight sector and particle injections at geosynchronous orbit. A similar event was observed on the following day around 0230 UT (\sim0515 MLT) with the unusual and significant difference that two convection reversals were observed, both contracting poleward. We show that this feature is not an ionospheric signature of two active reconnection neutral lines as predicted by the near-Earth neutral model before the plasmoid is “pinched off”, and present two alternative explanations in terms of (1) viscous and lobe circulation cells and (2) polar cap contraction during northward IMF. The voltage associated with the anti-sunward flow between the reversals reaches a maximum of 13 kV during the substorm expansion phase. This suggests it to be associated with the polar cap contraction and caused by the reconnection of open flux in the geomagnetic tail which has mimicked “viscous-like” momentum transfer across the magnetopause.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s00585-994-0541-2
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  • 3
    Electronic Resource
    Electronic Resource
    Atrophy of the Hippocampal Formation in Early Familial Alzheimer's Disease (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 777 (1996), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Notes: The hippocampal formation (HF) is known from pathological and magnetic resonance imaging (MRI) studies to become severely atrophied in established Alzheimer's disease (AD). This study examined whether changes in the HF could also be detected in very early AD by scanning subjects at risk of developing familial AD (FAD). Five at risk members of a pedigree with the amyloid precursor protein (APP) 717 valine to glycine mutation underwent serial MRI scanning with volumetric measurement of the HF as well as neurological and neuropsychological assessments. Over a period of two years two subjects became clinically affected, a loss of up to 20% of the volume of the HF occurred in the two years over which symptoms first appeared. Asymmetrical HF atrophy was shown to have been present before the development of overt symptoms. This may have important implications for early diagnosis in AD more generally.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1996.tb34423.x
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  • 4
    Electronic Resource
    Electronic Resource
    WIND TUNNEL TESTING OF ANTENNA MODELS (1964)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 116 (1964), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1964.tb33946.x
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  • 5
    Electronic Resource
    Electronic Resource
    A specific ringer solution for the plaice (Pleuronectes platessa L.) (1973)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 5 (1973), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Following analysis of the serum of the blood of the plaice (Pleuronectes platessa L.), a Ringer solution specific for this fish has been devised and tested. It has proved a satisfactory physiological saline for use in electrophysiological experiments and in the preparative procedures for electron microscopy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1973.tb04491.x
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  • 6
    Electronic Resource
    Electronic Resource
    CdS semiconductor nanoparticles in silica sonogel matrices (1994)
    Springer
    Journal of sol gel science and technology 2 (1994), S. 689-694 
    Details
    ISSN: 1573-4846
    Keywords: II–VI semiconductor ; ultrasounds ; quantum dots ; nanoparticles ; DCCA
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract SiO2 gels obtained by sonocatalytic method combined with DCCA were used as host-matrices for extremely fine dispersions of CdS semiconductor particles. Small crystallites were produced “in situ” by H2S gas diffusion method. The particles were characterized by TEM and HRTEM, EXAFS, UV-Vis and Raman spectroscopies. The size of crystallites ranged from 5 to 10 nm. The optical transmission spectra showed the characteristic blue shift as a function of the particles size, as predicted by the theory. The optical and mechanical qualities of the samples were substantially improved by an infiltration method using a sono-sol which sealed the superficial pores thus ensuring greater longevity and the possibility of obtaining transparent gels by polishing.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00486333
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  • 7
    Electronic Resource
    Electronic Resource
    Influence of Cd content and Se doping on the formation of CdSe nanocrystals in silica xerogels: A SAXS study (1997)
    Springer
    Journal of sol gel science and technology 8 (1997), S. 285-291 
    Details
    ISSN: 1573-4846
    Keywords: CdSe nanocrystals ; silica xerogels ; sonogels ; SAXS
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Small-angle X-ray scattering (SAXS) experiments were carried out to characterize the structure of the composite formed by CdSe nanocrystals embedded in a popous silica matrix (silica xerogels containing Cd with formamide addition and ultrasound treatment). SAXS results from samples before Se diffusion indicate the presence of heterogeneities with a bimodal size distribution which was associated to the existence of mesopores (pores of several hundred Å) immersed in a nanoporous matrix (characteristic pore radii of 20–30 Å). The diffusion of Se induces the nucleation and growth of CdSe nanocrystals. The average size of the nanocrystals increases with Cd content. Higher Se doses promote the formation of larger nanocrystals (radius of gyration of ∼30 to 50 Å). Anomalous scattering results confirm the existence of Se aggregation associated with CdSe nanocrystal formation and suggest that only partial segregation of Cd and Se occurs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02436853
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  • 8
    Electronic Resource
    Electronic Resource
    SANS Study of CdS and CdSe Quantum Dot Crystal Growth in a Silica Matrix by Sol-Gel (1998)
    Springer
    Journal of sol gel science and technology 13 (1998), S. 629-633 
    Details
    ISSN: 1573-4846
    Keywords: quantum dots ; II–VI crystal growth ; silica gel ; SANS
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Size and size distribution of the semiconductor nanocrystals embedded in a dielectric matrix play a dominant role in line broadening and the exciton quantum confinement level. The results show new aspects of the CdS and CdSe crystal growth as quantum dots using small angle neutron scattering techniques (SANS). Thus, the crystal growth influences the aggregation process of the silica network. The intensity difference of the scattering between the silica matrix and the composite accounts for the crystal size and their volume fraction. Under similar conditions CdS nanocrystals grow faster and bigger than CdSe ones.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008611814985
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  • 9
    Electronic Resource
    Electronic Resource
    Obtaining and sintering yttria stabilized zirconia (YSZ) powders from alkoxides (1994)
    Springer
    Journal of sol gel science and technology 2 (1994), S. 347-352 
    Details
    ISSN: 1573-4846
    Keywords: zirconia ; sintering ; densification ; heat treatment ; yttria stabilized zirconia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Amorphous zirconia ceramics powders containing 3 and 6 mol% yttria were prepared by controlled hydrolysis of alkoxides. Characterization of these powders was carried away by Thermal Analysis, X-ray Diffraction, Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray Analysis (EDAX™). The calcination temperature was optimized for compaction at a temperature ranging from 500–800°C. 3% molar YSZ powders from alkoxide, that attained 98% of the theoretical bulk density, showed the best behaviour.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00486268
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  • 10
    Electronic Resource
    Electronic Resource
    On the frame-dependence of stress and heat flux in polar fluids (1973)
    Springer
    Zeitschrift für angewandte Mathematik und Physik 24 (1973), S. 853-860 
    Details
    ISSN: 1420-9039
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Description / Table of Contents: Résumé Le but de cet article est de développer une théorie spéciale des fluides à molécules polaires afin d'éclaircir deux questions soulevées dans un récent article de Muller (1), à savoir: le flux de chaleur et une possible relation de dépendance entre la tension et le système de coordonnées choisi.
    Notes: Summary A special theory of polar fluids is developed with a view to providing some insight into the questions of the frame-dependence of stress and heat flux, arising out of a recent paper by Müller (1).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01590794
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