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  • 1
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    Spacing and amplitude of IR temperature anomalies and hydrate content of sediments from ODP Leg 304 sites (Table 1) (2004)
    PANGAEA
    In:  Supplement to: Tréhu, Anne M; Long, Philip E; Torres, Marta E; Bohrmann, Gerhard; Rack, Frank R; Collett, Tim S; Goldberg, D S; Milkov, Alexei V; Riedel, Michael; Schultheiss, P; Bangs, N L; Barr, Samantha R; Borowski, Walter S; Claypool, George E; Delwiche, Mark E; Dickens, Gerald Roy; Gràcia, Eulàlia; Guerin, Gilles; Holland, M; Johnson, J E; Lee, Young-Joo; Liu, C-S; Su, Xin; Teichert, Barbara M A; Tomaru, Hitoshi; Vanneste, M; Watanabe, Mahito; Weinberger, J L (2004): Three-dimensional distribution of gas hydrate beneath southern Hydrate Ridge: constraints from ODP Leg 204. Earth and Planetary Science Letters, 222(3-4), 845-862, https://doi.org/10.1016/j.epsl.2004.03.035
    Details
    Publication Date: 2024-01-09
    Description: Large uncertainties about the energy resource potential and role in global climate change of gas hydrates result from uncertainty about how much hydrate is contained in marine sediments. During Leg 204 of the Ocean Drilling Program (ODP) to the accretionary complex of the Cascadia subduction zone, we sampled the gas hydrate stability zone (GHSZ) from the seafloor to its base in contrasting geological settings defined by a 3D seismic survey. By integrating results from different methods, including several new techniques developed for Leg 204, we overcome the problem of spatial under-sampling inherent in robust methods traditionally used for estimating the hydrate content of cores and obtain a high-resolution, quantitative estimate of the total amount and spatial variability of gas hydrate in this structural system. We conclude that high gas hydrate content (30–40% of pore space or 20–26% of total volume) is restricted to the upper tens of meters below the seafloor near the summit of the structure, where vigorous fluid venting occurs. Elsewhere, the average gas hydrate content of the sediments in the gas hydrate stability zone is generally 〈2% of the pore space, although this estimate may increase by a factor of 2 when patchy zones of locally higher gas hydrate content are included in the calculation. These patchy zones are structurally and stratigraphically controlled, contain up to 20% hydrate in the pore space when averaged over zones ~10 m thick, and may occur in up to ~20% of the region imaged by 3D seismic data. This heterogeneous gas hydrate distribution is an important constraint on models of gas hydrate formation in marine sediments and the response of the sediments to tectonic and environmental change.
    Keywords: 204-1244B; 204-1244C; 204-1244E; 204-1245A; 204-1245B; 204-1245C; 204-1246A; 204-1246B; 204-1247A; 204-1247B; 204-1248A; 204-1248C; 204-1249A; 204-1249F; 204-1250A; 204-1250C; 204-1250D; 204-1251A; 204-1251B; 204-1251D; 204-1252A; Calculated; Comment; Comment 2 (continued); Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; DRILL; Drilling/drill rig; Elevation of event; Event label; Hydrate; Joides Resolution; Latitude of event; Leg204; Length, difference; Longitude of event; North Pacific Ocean; Number; Ocean Drilling Program; ODP; Recovery; Spacing; Temperature, difference
    Type: Dataset
    Format: text/tab-separated-values, 194 data points
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    DATA PANGAEA
  • 2
    facet.materialart.
    Unknown
    Internal friction of foamed aluminium in the range of acoustic frequencies (1998)
    Springer
    Details
    Publication Date: 1998-04-01
    Print ISSN: 0022-2461
    Electronic ISSN: 1573-4803
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Springer
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    PAPER CURRENT
  • 3
    Electronic Resource
    Electronic Resource
    The influence of atmosphere on hysteresis loss and eddy current loss of low loss Mn-Zn ferrites (abstract) : 35th annual conference on magnetism and magnetic materials (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 5369-5369 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The working frequency of Mn-Zn ferrites in switching power supply has been increased recently. Therefore, the manufacturing Mn-Zn ferrites with low loss at high frequency is very important. However, there were few reports concerning the core loss of Mn-Zn ferrites.1 It is beneficial to study the parameters affecting the core loss of Mn-Zn ferrites. Therefore, we studied the influence of atmosphere on the hysteresis loss (Wh) and eddy current loss (We) for different compositions in this work. Three compositions, Mn0.70Zn0.21−xFe2.09+xO4 (x=0, 0.01, 0.02), were prepared by traditional ceramic process. The sintering condition is 1385 °C for 4 h. Then, the samples are annealed at 1100 °C for 24 h in different oxygen partial pressure (0.015–1.0 vol %). Experimental results show that both We and Wh have minimum value at different oxygen partial pressure for samples with different composition. Increasing Fe content which raises the Fe++ concentration shifts the We and Wh minimum point to higher annealing oxygen partial pressure. It is mainly due to the oxidation of Fe++ and the transition of conduction mechanism, and it will be further discussed later. We can obtain the lowest core loss for using 10 and 100 kHz are samples with composition x=0 annealed in 0.07 and 0.2 vol % oxygen partial pressure, respectively. Summarily, for application to low loss at different working frequency, it is found that different optimized atmosphere should be controlled during annealing for different composition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348034
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  • 4
    Electronic Resource
    Electronic Resource
    Effect of partial substitution of Ge4+ for Zn2+ on the microstructure and temperature stability of Mn-Zn ferrites (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 5506-5508 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effects of substitution of GeO2 for ZnO on the microstructure and magnetic properties of Mn-Zn ferrite have been studied. Results suggest that, to a very limited extent, by the substitution of Ge and a proper choice of sintering condition, good temperature coefficients can be obtained in a temperature range from 20 to 80 °C. Experimental results show that the substitution of GeO2 promotes discontinuous grain growth, and the lattice parameter is slowly reduced due to the substitution of from 0.5 to 2.0 mol % GeO2 for ZnO. The temperature coefficient is extremely process sensitive. For appropriate Ge substitution (0.5%), optimum initial permeability and the temperature coefficient are dependent on the sintering conditions. Samples with 0.5 mol % GeO2 sintered at 1290 °C using a rapid heating rate and short-time sintering yielded the best temperature coefficient of 0.1×10−6 °C−1 over the range 20–80 °C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.345866
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  • 5
    Electronic Resource
    Electronic Resource
    Relativistic laser guiding in an azimuthal magnetic field in a plasma (2001)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 8 (2001), S. 285-288 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Strong azimuthal magnetic field, Bs θ(circumflex), generated in an intense laser plasma interaction, has a focusing effect on the laser. The rays having E⊥Bs propagate as an X mode with a refractive index maximum on the axis and are focused. However, rays with E(parallel)Bs propagate unaffected by the magnetic field. The relativistic mass nonlinearity reinforces additional focusing on the laser. Under the combined effect of both focusing mechanisms a linearly polarized laser emerges with a reduced spot size and elliptical cross section. This process may provide a diagnostic means for measuring the azimuthal magnetic field. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1323756
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  • 6
    Electronic Resource
    Electronic Resource
    Stimulated Raman scattering in a plasma channel (1996)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 3 (1996), S. 3410-3413 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An intense laser beam propagating in a low-density plasma channel undergoes stimulated Raman forward scattering, producing a plasma wave and two electromagnetic sideband waves. The electromagnetic waves are localized within a width ∼(ca/ωp0)1/2, where a is the radius of the channel, ωp0 is the plasma frequency on the axis of the channel, and c is the velocity of light, whereas the localization of the plasma wave is dependent on the growth rate of the Raman process. The localization effects reduce the region of interaction and the growth rate. At moderate intensities the growth rate scales as 2/3 power of intensity, however, at higher intensities it varies less rapidly. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.871617
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  • 7
    Electronic Resource
    Electronic Resource
    Physical mechanism of enhanced stability from negative shear in tokamaks: Implications for edge transport and the L-H transition (1996)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 3 (1996), S. 2221-2223 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The enhancement of stability to ballooning modes from negative shear in tokamaks is shown to be a simple consequence of the orientation of the convective cell with respect to the toroidally outward effective gravity, g↘. For modest positive shear, convective cells remain oriented along g↘ as they map along field lines. In contrast, for negative shear or very positive shear convective cells twist strongly away from g↘ and are less strongly driven. The twist of convection cells is controlled by the profile of the vertical magnetic field along the outer midplane, Bz. Twist is a minimum in regions where Bz is independent of the major radius. Transport should be highest in such locations. Resistive ballooning modes in the tokamak edge are strongly stabilized by modest values of negative shear. Tokamak discharges with finite values of βp develop regions of local negative shear on the outside midplane of the plasma torus. This local negative shear should self-stabilize resistive ballooning modes at finite values of the poloidal beta. This effect may impact the transition to high confinement operation (H-mode). © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.871928
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  • 8
    Electronic Resource
    Electronic Resource
    Self-generated magnetic field in an amplitude modulated laser filament in a plasma (1994)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 1 (1994), S. 990-992 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A short pulse laser of finite spot size is modeled as an amplitude modulation in time and transverse dimension. The laser exerts a time-dependent curl-free ponderomotive force Fp on the electrons, imparting to them a transverse velocity. When equilibrium plasma density has a gradient @R∇n0⊥Fp the electron current density is irrotational, producing a quasistatic magnetic field. The relevance of the process to plasma accelerators and moving ionization fronts is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.870757
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  • 9
    Electronic Resource
    Electronic Resource
    Laser frequency upshift, self-defocusing, and ring formation in tunnel ionizing gases and plasmas (2000)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 7 (2000), S. 4360-4363 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The combined effects of tunnel ionization of gases on laser frequency upshift, defocusing, and ring formation are considered self-consistently. A high-intensity short pulse laser causes rapid tunnel ionization of a gas. The increasing plasma density leads to a decreasing refractive index, modulating the phase of the laser as it propagates and causing frequency upshift and supercontinuum generation. For laser intensity profile peaking on axis, the tunnel ionization produces a minimum of refractive index on axis, thus defocusing the laser. The defocusing reduces the ionization rate and frequency upshift. As the laser propagates over a Rayleigh length its trailing portion develops a ring shape distribution due to stronger defocusing of rays on axis than the off-axis rays, as seen in a recent experiment. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1313568
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  • 10
    Electronic Resource
    Electronic Resource
    Stimulated Brillouin scattering in the strong coupling regime (1996)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 3 (1996), S. 3414-3419 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Stimulated Brillouin scattering (SBS) has been reexamined in the strong coupling limit. The three-wave interaction in the strong coupling regime, which gives rise to a purely growing mode for wave numbers k(approximately-greater-than)2k0, where k0 is the wave vector of the pump wave, has been studied. This regime was first found by Cohen and Max [Phys. Fluids 22, 1121 (1979)]. In this regime, for a flowing plasma, a significant portion of the unstable spectrum is found to be blueshifted even for the Mach number equal to unity. For the inhomogeneous case, the convective gain in the strong coupling limit turns out to be identical to the gain in the SBS in the weak coupling limit regime. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.871618
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