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  • Springer  (65)
  • Periodicals Archive Online (PAO)
  • 1995-1999  (65)
  • 1970-1974  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Rh — plasma iron binding capacity association. New evidence (1995)
    Springer
    Human genetics 〈Berlin〉 96 (1995), S. 219-220 
    Details
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The relationship between Rh phenotypes and the total iron binding capacity (TIBC) of plasma was studied in a sample from Medellín, Colombia. In a previous report from Santiago, Chile, children carrying the C Rh specificity had a higher level of TIBC than those having the specificity. The same association was found in young people from Medellín.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00207383
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  • 2
    Electronic Resource
    Electronic Resource
    Signatures of interplanetary transients behind shocks and their associated near-surface solar activity (1998)
    Springer
    Annales geophysicae 16 (1998), S. 359-369 
    Details
    ISSN: 0992-7689
    Keywords: Interplanetary physics ; Interplanetary shocks ; Solar wind plasma ; Solar physics ; Flares and mass ejections
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Interplanetary transients with particular signatures different from the normal solar wind have been observed behind interplanetary shocks and also without shocks. In this paper we have selected four well-known transient interplanetary signatures, namely: magnetic clouds, helium enhancements and bidirectional electron and ion fluxes, found in the solar wind behind shocks, and undertaken a correlative study between them and the corresponding solar observations. We found that although commonly different signatures appear in a single interplanetary transient event, they are not necessarily simultaneous, that is, they may belong to different plasma regions within the ejecta, which suggests that they may be generated by complex processes involving the ejection of plasma from different solar regions. We also found that more than 90% of these signatures correspond to cases when an Hα flare and the eruption of a filament occurred near solar central meridian between 1 and 4 days before the observation of the disturbance at 1 AU, the highest association being with flares taking place between 2 and 3 days before. The majority of the Hα flares were also accompanied by soft X-ray events. We also studied the longitudinal distribution of the associated solar events and found that between 80% and 90% of the interplanetary ejecta were associated with solar events within a longitudinal band of ±30° from the solar central meridian. An east-west asymmetry in the associated solar events seems to exist for some of the signatures. We also look for coronal holes adjacent to the site of the explosive event and find that they were present almost in every case.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s00585-998-0359-4
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  • 3
    Electronic Resource
    Electronic Resource
    The spatial relationship between active regions and coronal holes and the occurrence of intense geomagnetic storms throughout the solar activity cycle (1997)
    Springer
    Annales geophysicae 16 (1997), S. 49-54 
    Details
    ISSN: 0992-7689
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract We study the annual frequency of occurrence of intense geomagnetic storms (Dst 〈 −100 nT) throughout the solar activity cycle for the last three cycles and find that it shows different structures. In cycles 20 and 22 it peaks during the ascending phase, near sunspot maximum. During cycle 21, however, there is one peak in the ascending phase and a second, higher, peak in the descending phase separated by a minimum of storm occurrence during 1980, the sunspot maximum. We compare the solar cycle distribution of storms with the corresponding evolution of coronal mass ejections and flares. We find that, as the frequency of occurrence of coronal mass ejections seems to follow very closely the evolution of the sunspot number, it does not reproduce the storm profiles. The temporal distribution of flares varies from that of sunspots and is more in agreement with the distribution of intense geomagnetic storms, but flares show a maximum at every sunspot maximum and cannot then explain the small number of intense storms in 1980. In a previous study we demonstrated that, in most cases, the occurrence of intense geomagnetic storms is associated with a flaring event in an active region located near a coronal hole. In this work we study the spatial relationship between active regions and coronal holes for solar cycles 21 and 22 and find that it also shows different temporal evolution in each cycle in accordance with the occurrence of strong geomagnetic storms; although there were many active regions during 1980, most of the time they were far from coronal holes. We analyse in detail the situation for the intense geomagnetic storms in 1980 and show that, in every case, they were associated with a flare in one of the few active regions adjacent to a coronal hole.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s00585-997-0049-7
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  • 4
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    Unknown
    Experiment and Development in Education (1972)
    Washington, D.C. : Periodicals Archive Online (PAO)
    Finance and Development. 9:2 (1972:June) 22 
    Details
    ISSN: 0015-1947
    Topics: Economics
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:e355-1972-009-02-000004
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  • 5
    Electronic Resource
    Electronic Resource
    Effect of Aging on Nonhydrolytic Alumina Xerogels (1997)
    Springer
    Journal of sol gel science and technology 10 (1997), S. 127-137 
    Details
    ISSN: 1573-4846
    Keywords: aging ; nonhydrolytic alumina xerogels ; TGA ; DTA
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Nonhydrolytic sol-gel route is a relatively recent process which enables production of complex, multicomponent oxide materials. This process has some advantages over the conventional hydrolytic sol-gel route due to the ability to produce low-shrinkage, homogeneous, multicomponent gels. The objective of this work was to determine the effects of aging of nonhydrolytic gels on the composition, yield, phase transformations and morphology. Xerogels were prepared from aluminum chloride and isopropyl ether. Properties were studied using AgNO3 titrations, TGA/DTA, XRD, and BET analysis. We have found that the gels contain significant amount of chlorine where the Cl/Al atomic ratio ranges from 1.1–0.6 depending on the aging time. The crystallization temperature and enthalpy of crystallization decreased with aging time. The decrease of the surface area near the crystallization temperature correlates well with the decrease of the enthalpy of crystallization as a function of aging time. A closed pore phenomenon has been observed in the nonhydrolytic alumina system. Finally, analysis of the condensation degree (CD) yielding Al–O–Al bonds suggests that the rate determining step before the gel point is the alkoxy groups formation. However, during aging of the gels, the CD remains constant since the condensation of chloride with isopropoxy groups is stericly inhibited. Surface areas in the 300–650 m2/g range were obtained depending on the aging time.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018391311997
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  • 6
    Electronic Resource
    Electronic Resource
    Resorbable polyacrylic hydrogels derived from vitamin E and their application in the healing of tendons (1999)
    Springer
    Journal of materials science 10 (1999), S. 641-648 
    Details
    ISSN: 1573-4838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: Abstract A hydrogel containing vitamin E (α-tocopherol) was prepared by free radical polymerization of 2-hydroxyethyl methacrylate (HEMA) and α-tocopheryl methacrylate (VEMA), the latter being synthesized previously to its use. The hydrogel containing 20 wt % of VEMA showed equilibrium water content in the range of those of hydrogel networks, at any pH. The swelling of the hydrogel followed Fick's law, indicating that sorption of water molecules is controlled by diffusion, although the values of diffusion coefficients for the VEMA-containing hydrogel were lower than those of poly-HEMA in any medium. Surface characterization of the VEMA-containing hydrogel revealed a decrease in the surface energy of solid owing to a decrease of the polar component mainly. The application of finely powdered xerogel of HEMA–VEMA copolymer bearing 20 wt % of the vitamin E derivative gave a very fast and positive response showing an activated regeneration capacity, probably due to the stimulation of the cellular proliferation or the more plausible effect, the cellular protection associated to the antioxidant properties of the vitamin E residue. © 1999 Kluwer Academic Publishers
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008991825657
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  • 7
    Electronic Resource
    Electronic Resource
    Microstructure Evolution of Nonhydrolytic Alumina Gels (1997)
    Springer
    Journal of sol gel science and technology 10 (1997), S. 5-12 
    Details
    ISSN: 1573-4846
    Keywords: alumina gels ; nonhydrolytic sol-gel ; fractal structures
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Nonhydrolitic sol-gel processes of aluminum chloride and aluminum bromide with isopropyl ether and aluminum sec-butoxide were performed at various temperatures. Based on the Arrhenius type variation of the gelation time with temperature, activation energies for the gelation were found to be in the range 19–25 Kcal/mol range. The energies were found to be sensitive to the nature of the aluminum ligands and the chemical scheme. Due to the large activation energy, it is possible to stop the reaction at any time before gelation by cooling the sol to room temperature. Small angle X-ray scattering (SAXS) of sols from the AlClAlCl3/Pr $$_2^i $$ O system shows unique development of a fractal like structure with nanometer scale order, demonstrated by discrete peaks in the SAXS data. A fractal dimension D = 1.64 was found. An aggregation scheme is proposed to explain this phenomenon. A fractal dimension of 2.4 without small scale ordering found for xerogels prepared from the AlCl3/ASB system reflects the effect of the different precursors on the microstructure of nonhydrolytic gels.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018306019878
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  • 8
    Electronic Resource
    Electronic Resource
    Different Types of Coronal Mass Ejections At Minimum and Maximum of Solar Activity and Their Relation to Magnetic Field Evolution (1998)
    Springer
    Solar physics 180 (1998), S. 461-471 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Coronal mass ejections (CMEs) are considered to be associated with large-scale, closed magnetic field structures in the corona. These structures change throughout the solar activity cycle following the evolution of the general solar magnetic field. To study the variation of CME characteristics with the evolution of coronal magnetic structures, we compute the 3-D coronal magnetic field at minimum and maximum of activity with a source-surface potential field model. In particular, we study the central latitude distribution of CMEs and the frequency of occurrence of the different CME types in these two periods. We find that most CMEs are indeed associated with large-scale, magnetically closed structures, and their latitudinal distribution follows the solar cycle latitudinal changes of the location of these structures. We also find that different CME types, which constitute different fractions of the total during the maximum and the minimum, are associated with different shapes and orientations of the closed structures at different times of the solar cycle.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005010926470
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  • 9
    Electronic Resource
    Electronic Resource
    Electromechanical properties of continuous fibre-reinforced piezoelectric composites (1997)
    Springer
    Mechanics of composite materials 33 (1997), S. 475-482 
    Details
    ISSN: 1573-8922
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The objective of this paper is to present analytical expressions of the basic effective constants (for transducer applications) of fibrous piezoelectric composites with a periodic structure. These expressions were obtained on the basis of the asymptotic averaging method, following the same procedure used in [1] for the purely elastic case. The averaged electromechanical properties for these piezocomposites can be calculated from the above formulas. The results obtained from the theoretical predictions with the use of homogenization method show good agreement with the existing experimental results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02256903
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  • 10
    Electronic Resource
    Electronic Resource
    Influence of peroxides, ascorbate and glutathione on germination and growth in Lupinus albus L. (1997)
    Springer
    Biologia plantarum 39 (1997), S. 457-461 
    Details
    ISSN: 1573-8264
    Keywords: lupine ; oxidative stress
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Lupinus albus L. seeds were treated with different concentrations (from 10 µM to 50 mM) of H2O2, m-chloroperoxybenzoic acid (mCPBA), ascorbate (ASC) and glutathione (GSH). The efficiency as inhibitors on germination and on the subsequent growth of the hypocotyl was mCPBA 〉 GSH 〉 ASC = H2O2, which suggest that inhibitory efficiency was dependent on the compound per se rather than on its redox nature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1001057015956
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