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  • 1
    Electronic Resource
    Electronic Resource
    Gamma-ray emission of blazars (1996)
    Springer
    Astrophysics and space science 246 (1996), S. 119-128 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In this paper, the correlations of gamma ray with other bands are discussed for highly polarized blazars. The results show gamma rays are beamed. It is closely associated with the radio band emission, but not associated with optical or X-ray emissions. Gamma ray emission is likely from resynchrotron-self-Compton (SSC) process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00637403
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  • 2
    Electronic Resource
    Electronic Resource
    Anti-correlation between the extended power and the core dominance parameter of BL Lac objects (1996)
    Springer
    Astrophysics and space science 246 (1996), S. 159-165 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The XBL and RBL samples presented recently by Kollgaardet al. (1996) are employed to investigate whether the extended power of BL Lac objects is correlated with the core dominance parameter. The results show that the two quantities are statistically anti-corelated at a rather high level of confidence for both XBLs and RBLs. Since the core dominance parameter is generally used as a relative measure of orientation and the extended emission of radio sources is assumed unbeamed and isotropic, the results obviously contradict common inference from unified schemes. By adopting and combining some basic concepts of unified schemes and the different SED scenario, a possible explanation for the results is suggested.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00637407
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  • 3
    Electronic Resource
    Electronic Resource
    Similarity solution of mixed convection over a horizontal moving plate (1997)
    Springer
    Heat and mass transfer 32 (1997), S. 199-206 
    Details
    ISSN: 1432-1181
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Description / Table of Contents: Zusammenfassung  Die Untersuchung bezieht sich auf den Wärme- und Stoffübergang bei Mischkonvektion über einer horizontalen Platte. Durch Anwendung der Translationsgruppen-Theorie auf die Grundgleichungen für Kontinuität, Impuls, Energie- und Diffusion wird gezeigt, daß eine Ähnlichkeitslösung dann existiert, wenn Temperatur und Konzentration an der Wand proportional zu x 4/(7-5n) sind und die Geschwindigkeit der bewegten Platte proportional zu x (3-n)/(7-5n) ist. Somit läßt sich das Problem in Abhängigkeit von Ähnlichkeitsparametern beschreiben. Die Ähnlichkeitsgleichungen wurden numerisch mittels eines Runge/Kutta-Schemas vierter Ordnung gelöst. Die numerischen Resultate für Pr=0.72 und verschiedene Werte der Parameter Sc, K 1, K 2 und K 3 zeigen deren Einfluß auf das Strömungsfeld sowie den Wärme- und Stoffübergang.
    Notes: Abstract  Investigation to the mixed convective heat and mass transfer over a horizontal plate has been carried out. By applying transformation group theory to analysis of the governing equations of continuity, momentum, energy and diffusion, we show the existence of similarity solution for the problem provided that the temperature and concentration at the wall are proportional to x 4/(7-5n) and that the moving speed of the plate is proportional to x (3-n)/(7-5n), and further obtain a similarity representation of the problem. The similarity equations have been solved numerically by a fourth-order Runge–Kutta scheme. The numerical results obtained for Pr=0.72 and various values of the parameters Sc, K 1, K 2 and K 3 reveals the influence of the parameters on the flow, heat and mass transfer behavior.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002310050112
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  • 4
    Electronic Resource
    Electronic Resource
    Similarity solution of free convective boundary-layer behavior at a stretching surface (1999)
    Springer
    Heat and mass transfer 35 (1999), S. 191-196 
    Details
    ISSN: 1432-1181
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract In the present study, free convection and heat transfer behavior of electrically conducting fluid in the boundary layer over a vertical continuously stretching surface is investigated. The effects of free convection, magnetic field, suction/blowing at the surface and the stretching speed of the surface on the flow and heat transfer characteristics are considered. By applying one-parametric group theory to analysis of the problem, a similarity solution is found. The governing equations of continuity, momentum and energy are solved numerically by a fourth-order Runge-Kutta scheme. The numerical results, which are obtained for the flow and heat transfer characteristics, reveal the influences of the parameters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002310050313
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  • 5
    Electronic Resource
    Electronic Resource
    Vitrification of trehalose by water loss from its crystalline dihydrate (1996)
    Springer
    Journal of thermal analysis and calorimetry 47 (1996), S. 1391-1405 
    Details
    ISSN: 1572-8943
    Keywords: bioprotection ; biostabilization ; crystal stability limit ; desolvation amorphization ; fragility of saccharides ; trehalose
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Trehalose dihydrate, on careful dehydration below its fusion point, retains its original crystal facets but becomes X-ray amorphous, an unusual example of direct crystal-to-glass transformation. From DSC studies, the glass obtained by this route seems to be of abnormally low enthalpy, but after an initial scan, the normal form of glass transition is exhibited, withT g=115
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01992835
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  • 6
    Electronic Resource
    Electronic Resource
    Study of the X-ray selected BL Lac object 1727+502 (1995)
    Springer
    Astrophysics and space science 229 (1995), S. 157-162 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In this paper, accretion disc and synchrotron emission models have been used to analyse simultaneous IR-optical-UV data of the BL Lac object 1727+502. In the following, some of its properties have been discussed. It is shown that the temperature of the disc is about 19, 000°k, the mass of the central black hole isM 8 ≈ 5.4, and the accretion ratio is ≈ 10−3 M ⊙/yr.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00658573
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  • 7
    Electronic Resource
    Electronic Resource
    Varistor properties and microstructure of ZnO–BaO ceramics (1997)
    Springer
    Journal of materials science 32 (1997), S. 415-419 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Ceramics in the system ZnO–BaO have been investigated for possible use as varistors. Specimens were prepared by the mixed oxide route, and were sintered at temperatures in the range 1000–1400°C. The electrical properties were determined using d.c. A and impulse techniques. The ZnO–BaO ceramics have a two-phase microstructure comprising a ZnO phase and a Ba-rich grain boundary phase. Due to liquid phase sintering, the average grain sizes for the ZnO–BaO ceramics are large (typically 35–55 μm for samples sintered at 1300°C). This results in low breakdown fields, (≤1000 V cm-1). The maximum non-linearity exponent obtained for ZnO–BaO ceramics (∼14) is higher than that for binary ZnO–Bi2O3 ceramics. However, the high water solubility of the Ba-rich phase may restrict the use of ZnO–BaO ceramics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018561602083
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  • 8
    Electronic Resource
    Electronic Resource
    Clustering of GPI-Anchored Folate Receptor Independent of Both Cross-Linking and Association with Caveolin (1997)
    Springer
    The journal of membrane biology 159 (1997), S. 137 -147 
    Details
    ISSN: 1432-1424
    Keywords: Key words: Folate receptor — Caveolin — Caveolae — Folate transport — Glycosyl-phosphatidylinositol
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract. The distribution of the glycosyl-phosphatidylinositol (GPI)-anchored folate receptor (FR) in a diffuse pattern vs. functional clusters associated with caveolae has been debated. The equivocal nature of direct localization studies is due to possible experimental artifacts such as cross-linking of the protein by the antibody probes prior to fixation and alternatively the use of a disruptive fixation method. Such studies have also been complicated by the use of cells that vastly overexpress FR. In this study a monovalent probe, i.e., a biotinylated folate affinity analogue was used to covalently label FR. Cells expressing moderate levels of FR, i.e., JAR epithelial cells expressing FR-α and recombinant CHO fibroblasts expressing FR-β, were used. The affinity label and either caveolin or antigenic sites on FR were localized by electron microscopy using colloidal gold conjugated antibody probes post-embedding in the relatively permeable LR White resin. The method avoided both receptor cross-linking and early fixation steps and also enabled the use of transport permissive conditions while labeling FR at the cell surface. The results indicate that in steady-state FR is not significantly colocalized with caveolin. However, the receptor molecules occur predominantly in clusters, independent of cross-linking, providing a physical basis for the observed kinetics of receptor internalization and recycling during folate transport. Evidence is also presented to suggest that early mild fixation will disrupt the clustering of FR.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002329900277
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  • 9
    Electronic Resource
    Electronic Resource
    Low-density lipoproteins modulate endothelial cells to secrete endothelin-1 in a polarized pattern: a study using a culture model system simulating arterial intima (1999)
    Springer
    Cell & tissue research 295 (1999), S. 89-99 
    Details
    ISSN: 1432-0878
    Keywords: Key words Atherosclerosis ; Culture model ; Endothelial cell ; Endothelin-1 ; Oxidized LDL ; Human
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract We investigated the structural and functional properties of human umbilical vein endothelial cells (HUVECs) cultured on a two-chamber culture model system using an amnion membrane. Compared to HUVECs cultured on a plastic dish, HUVECs cultured on the model system exhibited several features similar to those of in vivo vessels, including formation of the intercellular junctional devices and expression of tight junction-associated protein ZO-1 and adherence junction-associated protein α-catenin. Furthermore, we found that HUVECs had a property of polar secretion of endothelin-1 (ET-1). About 90% of the total amount of synthesized ET-1 was found in the lower well, designated as the basal side. When HUVECs were incubated with either native low-density lipoproteins (nLDLs) or oxidized LDLs (oxLDLs) at a concentration of 100 μg/ml, ET-1 secretion was significantly increased, dependent on the cell side (apical vs basal) on which the nLDLs or oxLDLs were loaded. When the LDLs were loaded on the apical side, the secretion of ET-1 from HUVECs on the apical side was increased by 48% (nLDL) and 61% (oxLDL), whereas it was accompanied by a concomitant decrease of ET-1 on the basal side (45% by nLDLs and 38% by oxLDLs). When loaded on the basal side, however, ET-1 was increased by 23% (nLDLs) and 53% (oxLDLs) on the basal side, with a 26% simultaneous decrease of ET-1 on the opposite side for both nLDLs and oxLDLs. On the contrary, high-density lipoproteins (HDLs) inhibited ET-1 secretion from HUVECs on the opposite side of the well on which HDLs were loaded; there was a 57% decrease on the basal side when HDLs were loaded on the apical side, and a 46% decrease on the apical side when loaded on the basal side. These results indicate that modulation of ET-1 secretion from ECs by lipoproteins is virtually dependent on the place (apical vs basal) where these proteins are present. The finding that nLDLs and oxLDLs enhance ET-1 secretion by ECs in a polarized pattern suggests that ET-1 may be involved in pathophysiological processes such as atherogenesis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004410051215
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  • 10
    Electronic Resource
    Electronic Resource
    Similarity solution of mixed convection with diffusion and chemical reaction over a horizontal moving plate (1998)
    Springer
    Acta mechanica 126 (1998), S. 59-69 
    Details
    ISSN: 1619-6937
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary The mixed convective heat and mass transfer over a horizontal plate has been investigated. A diffusion equation with a chemical reaction source term is taken into account. By applying transformation group theory to the analysis of the governing equations, we obtain a similarity solution of the problem in the case that the temperature and concentration at the wall and the moving speed of the plate are proportional to power distributions along the distance from the leading edge. Furthermore the similarity equations have been solved numerically by a fourth-order Runge-Kutta scheme. The numerical results obtained for various values of the Schmidt number, chemical reaction parameter and buoyancy parameters reveal the influence of the parameters on the flow, heat and mass transfer behavior.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01172799
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