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  • 11
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 12
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 13
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 14
    Electronic Resource
    Electronic Resource
    Springer
    Zeitschrift für angewandte Mathematik und Physik 33 (1982), S. 326-333 
    ISSN: 1420-9039
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Description / Table of Contents: Zusammenfassung Für die Ausbreitung von ebenen und zylindrischen Stoßwellen mit zeitabhängiger Energiezugabe in einem idealen Gas in Gegenwart eines achsialen Magnetfeldes sind numerische Resultate mit Hilfe einer modifizierten Ähnlichkeitsmethode erhalten worden. Die Ergebnisse sind in Übereinstimmung mit den experimentellen Beobachtungen von Patrick [6] über die Nicht-Existenz von gewöhnlichen Stoßwellen. Für starke Stöße liegt das heißeste Gebiet in der Nähe des Kolbens, bei schwächeren Stößen nahe zur Stoßfront. Die Gegenwart des Magnetfeldes vermindert die Temperatur in der Stoßzone mit Ausnahme der Region in Kolbennähe, wo die Temperatur steigt Erhöhung des Magnetfeldes erhöht die Stoßgeschwindigkeit. Die berechneten Änderungen der Anteile der magnetischen, inneren und kinetischen Energien mit der Stoßstärke unterstützen die Beobachtungen von Kolb [3]. Mit der Zunahme vonβ wird die Gleichverteilung der kinetischen und der inneren Energie gegen höhere Stoßstärken verschoben.
    Notes: Abstract Numerical results describing the propagation of plane and cylindrical blast waves with time dependent energy inputs in an ideal gas in presence of an axial magnetic field have been obtained by modified similarity method. These results are in agreement with Patrick's [6] experimental observations of non-existence of ordinary shock waves. For strong shocks the hottest region is located near the piston, whereas for weaker shocks the front becomes the hottest. The presence of magnetic field, however, reduces the temperature in the shocked region, except near the piston where it increases. An increase in magnetic field leads to an increase in shock velocity. Predicted variations of the percentages of magnetic, internal and kinetic energies with shock strength support the experimental observations of Kolb [3]. With increase inβ, equipartition between kinetic and internal energies is seen to shift towards higher shock strength.
    Type of Medium: Electronic Resource
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  • 15
    Electronic Resource
    Electronic Resource
    Springer
    Naturwissenschaften 56 (1969), S. 377-377 
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 16
    Electronic Resource
    Electronic Resource
    Springer
    Astrophysics and space science 104 (1984), S. 127-132 
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract For spherical blast waves propagating through a self-gravitating gas with an energy inputE α=E 0 t β, whereE α is the energy released up to timet,E 0 is a functional constant, and β is a constant, kinetic, internal heat, and gravitational potential energies have been computed. Taking the parameterA 2, which characterises the gravitational field, equal to 2, variations of the percentages of these energies for β=0, 1/2, 4/3, and 3 with shock strength have been presented. For β=3, the effect of cavitation on the percentages of kinetic energy and internal heat energies has been explored.
    Type of Medium: Electronic Resource
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  • 17
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The high/low-amplitude anisotropic wave train events (HAE/LAE) in CR intensity have been investigated during the period 1981–1990, using the neutron monitoring data for different latitudes. In all, 21 HAE and 15 LAE cases have been studied. It has been observed that the phase of the diurnal anisotropy remains in the same co-rotational direction for the majority of the HAE/LAE cases. However, it has also been observed that the phase of the diurnal anisotropy changes to later hours in some of the HAE cases, whereas it changes to early hours in some of the LAE cases. Further, the amplitude of the semi-diurnal anisotropy for HAE/LAE cases remains statistically the same; however, the phase of the semi-diurnal anisotropy for HAE has been found to shift to later hours for all events. Furthermore, the HAE occur dominantly during the declining phase of solar activity, whereas LAE occur dominantly during the minimum solar activity period. The geomagnetic activity index-Ap has been observed to remain low during the period of each HAE/LAE. The possible phenomenon to cause the enhanced/low-amplitude daily variation has been proposed to appear on the back side of the Sun.
    Type of Medium: Electronic Resource
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  • 18
    Electronic Resource
    Electronic Resource
    Springer
    Astrophysics and space science 115 (1985), S. 127-143 
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Modified similarity method has been used to study the propagation of spherical-variable energy blast waves through a self-gravitating gas. For an energy inputE α=E 0t4/3, whereE α is the energy released up to timet andE 0 is a functional constant, the similarity solutions correct up to third approximation have been obtained. It is found that the effects of self-gravitational forces are of third order. An increase in the parameterA 2 (characterising the gravitational field) increases the shock velocity.
    Type of Medium: Electronic Resource
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  • 19
    Electronic Resource
    Electronic Resource
    Springer
    Astrophysics and space science 168 (1990), S. 39-57 
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The CCW method (see Chester, 1854; Chisnell, 1955; Whitham, 1958) has been used to investigate the propagation of diverging shock waves through an ideal gas under its own gravitation having an initial density distributionρ 0 =ρ′ exp(−λr , whereρ′ is the density at the plane/axis/origin, respectively, for plane, cylindrical, and spherical symmetry of the shock and, λ is non-dimensional constant, for the two situations: viz., (i) when the shock is weak and (ii) when it is strong, simultaneously. Analytical relations for shock velocity and shock strength have been obtained. Expressions for the pressure, the density and the particle velocity immediately behind the shock have been derived. Their numberical estimates for plane and cylindrical symmetry of the shock, have been computed.
    Type of Medium: Electronic Resource
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  • 20
    Publication Date: 2018-10-01
    Description: Proliferative gastrointestinal (GI) tissue is radiation-sensitive, and heavy-ion space radiation with its high-linear energy transfer (high-LET) and higher damaging potential than low-LET γ-rays is predicted to compromise astronauts’ GI function. However, much uncertainty remains in our understanding of how heavy ions affect coordinated epithelial cell migration and extrusion, which are essential for GI homeostasis. Here we show using mouse small intestine as a model and BrdU pulse labeling that cell migration along the crypt–villus axis is persistently decreased after a low dose of heavy-ion 56Fe radiation relative to control and γ-rays. Wnt/β-catenin and its downstream EphrinB/EphB signaling are key to intestinal epithelial cell (IEC) proliferation and positioning during migration, and both are up-regulated after 56Fe radiation. Conversely, factors involved in cell polarity and adhesion and cell–extracellular matrix interactions were persistently down-regulated after 56Fe irradiation—potentially altering cytoskeletal remodeling and cell extrusion. 56Fe radiation triggered a time-dependent increase in γH2AX foci and senescent cells but without a noticeable increase in apoptosis. Some senescent cells acquired the senescence-associated secretory phenotype, and this was accompanied by increased IEC proliferation, implying a role for progrowth inflammatory factors. Collectively, this study demonstrates a unique phenomenon of heavy-ion radiation-induced persistently delayed IEC migration involving chronic sublethal genotoxic and oncogenic stress-induced altered cytoskeletal dynamics, which were seen even a year later. When considered along with changes in barrier function and nutrient absorption factors as well as increased intestinal tumorigenesis, our in vivo data raise a serious concern for long-duration deep-space manned missions.
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
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