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  • 1
    Electronic Resource
    Electronic Resource
    Wave breaking in a cold plasma near the top of a parabolic density profile (1994)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 1 (1994), S. 1777-1782 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Wave breaking of electron plasma waves in an unmagnetized, cold, collisionless plasma with a parabolic density profile is considered when the plasma resonance is situated near the top of the profile. For this case, wave breaking takes place at a density lower than the resonant one and limits the growth of the plasma wave. The dynamics of wave breaking in such conditions are studied as a function of position of resonance in the profile and of amplitude of the driver field.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.870684
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  • 2
    Electronic Resource
    Electronic Resource
    Ionization-induced frequency up-shift of a high-power microwave interacting with a plasma (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 2837-2844 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The propagation of an intense electromagnetic wave (EMW), of frequency 9 GHz, in an underdense, near critical, inhomogeneous plasma (ne≤1.2×1012 cm−3, Te(similar, equals)3 eV) leads to an up-shift of the EMW frequency of a few MHz. The injected EMW with power, P0≤250 kW, and with pulse duration of 1 μs, produces additional ionization of the neutral argon gas (n0(similar, equals)6.6×1013 cm−3) through the heating of plasma electrons. The increase of plasma density, which can reach during the EMW pulse several tens of percents in relative value, leads to a modulation in time of the spatial phase of the EMW. Experimental results for the evolution in space and in time of density, electric field, and frequency shift are compared to a simple nonlinear model of EMW propagation in a plasma, which takes into account the additional ionization due to the absorption of the EMW. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.872416
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  • 3
    Electronic Resource
    Electronic Resource
    Coupling between electron and ion waves in Nd-laser beat-wave experiments (1994)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 1 (1994), S. 1318-1327 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The beating between two colinear Nd-YLF and Nd-YAG lasers in a homogeneous plasma generates intense relativistic plasma waves associated with a high longitudinal electric field of the order of 1 GV/m. It is shown that these electron waves couple with ion waves in the regime of modulational instability. Electric field amplitude and saturation time obtained by Thomson scattering are in agreement with theoretical predictions taking this mechanism into account.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.870730
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  • 4
    Electronic Resource
    Electronic Resource
    Wave breaking in a cold plasma with a parabolic density profile (1992)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 4 (1992), S. 1362-1363 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The wave-breaking time of electronic plasma waves in an unmagnetized, cold plasma with a parabolic density profile is obtained analytically. The results are similar to those obtained in a linear density profile except at the top of the parabolic density profile where the wave-breaking time is shown to be proportional to E−1d instead of E−1/2d, Ed being the driving field.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.860090
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  • 5
    Electronic Resource
    Electronic Resource
    Nonlinear effects and chaotic behavior at plasma resonance (1990)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 2 (1990), S. 907-915 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Resonant absorption of an electromagnetic wave (f=3.5 GHz) in a multipolar discharge (ne0(approximately-equal-to)1011 cm−3) with an adjustable density gradient is studied. The transition from a nonlinear steady-state regime toward a chaotic one, occurring when the pump field or the gradient length is increased, is investigated experimentally and numerically.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.859290
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  • 6
    Electronic Resource
    Electronic Resource
    An acoustic sensor for simultaneous density and viscosity measurements in liquids (2000)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 71 (2000), S. 1433-1440 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We studied theoretically the properties of a vibrating sensor, constituted of a cylindrical tip partly immersed in a liquid. The tip is driven axially by a stepped horn and by a piezoelectric element. Equations of the fluid flow around the tip are solved and show that longitudinal and transverse waves are emitted in the fluid. This allows the device to be sensitive to the density and viscosity of the fluid. It is shown that the properties of the fluid can be deduced by measuring the frequency shift at resonance and the corresponding electric impedance. The precision of the actual device is still low for several reasons, which are discussed. Then our apparatus seems to be more convenient to in situ reaction monitoring rather than for rheological precise measurements. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1150476
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  • 7
    Electronic Resource
    Electronic Resource
    Characterization of aluminium coated poly(ethylene terephtalate) films by acoustic microscopy (1997)
    Springer
    Journal of materials science 32 (1997), S. 2655-2660 
    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 Poly(ethylene terephtalate) (PET) films coated with thermally evaporated aluminium are studied by acoustic microscopy after various thermal treatments. Three types of contrasts are observed on acoustic images which are interpreted in terms of the acoustic signature results. The first type of contrast behaviour is explained by the presence of ceramic particles. The second type of contrast behaviour can be characterized by the modelling of the Al/PET system as being adhesion defects. The formation of cyclic oligomers at the PET film surface during the thermal processing is envoked to explain the third type of contrast behaviour. Changes in films produced by thermal processing can thus be followed by acoustic imaging.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018671005485
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  • 8
    Electronic Resource
    Electronic Resource
    Local measurements of viscoelastic properties of fluids using near-field ultrasonics (1998)
    Springer
    Applied physics 66 (1998), S. S357 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 43.58.+z; 43.90.+v; 62.60.+v
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390051163
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  • 9
    Electronic Resource
    Electronic Resource
    Formation and chemical composition of atmospheric aerosols in an equatorial forest area (1988)
    Springer
    Journal of atmospheric chemistry 6 (1988), S. 301-322 
    Details
    ISSN: 1573-0662
    Keywords: Equatorial forest ; atmospheric aerosols ; size distribution ; chemical composition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract The physical properties and the chemical composition of atmospheric aerosols have been studied in an equatorial region in the southern Congo (Africa). Field experiments were conducted between 1978 and 1983 in the equatorial forest of the Mayombe during periods where the influence of biomass burning was minimum. The results indicate that the forest is a net source of both fine particles resulting primarily from gas-to-particle conversion and coarse particles produced by mechanical processes. Carbonaceous matter is the major component of these biogenic particles but the forest is also a significant source of sulfate, nitrate, ammonium and potassium. Half of this carbon is attached to submicron particles and likely derives from organic gaseous precursors naturally emitted by the local biosphere.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00051594
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  • 10
    Electronic Resource
    Electronic Resource
    Atmospheric methane budget in Africa (1992)
    Springer
    Journal of atmospheric chemistry 14 (1992), S. 395-409 
    Details
    ISSN: 1573-0662
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract This assessment of the atmospheric methane budget for the African Continent is based on a set of experimental data obtained in tropical Africa including methane emission from various biogenic sources, and biomass burning, and methane consumption in savanna and forest soils. Emission rates from the various sources, uptake rates of soils, and complementary data from the litterature allow calculation of regional methane fluxes by means of different data bases. Biomass burning, animals and natural wetlands are the three dominant sources of methane in Africa while rice paddy fields and termites appear as minor sources. The total methane emission is estimated to be in the range 20–40 MT of CH4 per year, methane uptake by soils being less than 2 MT per year. Net methane emission from the African continent accounts for less than 10% of global emissions from terrestrial ecosystems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00115247
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