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  • Polymer and Materials Science  (112,478)
  • Q
  • 1
    facet.materialart.
    Unknown
    La investigación en la Universidad (2021)
    Universidad Carlos III de Madrid. Figuerola Institute of Social Science History
    Details
    Publication Date: 2023-12-20
    Description: Con motivo del X aniversario de la Universidad Carlos III de Madrid, el Instituto Antonio de Nebrija de Estudios sobre la Universidad organizó durante los días 25 y 26 de febrero de 1999 un encuentro titulado La universidad española a examen: Jornadas sobre investigación en la Universidad. En el encuentro celebrado participaron representantes de distintos ámbitos científicos, con el fin de ofrecer una visión más completa del panorama actual de la investigación en la Universidad, dejando constancia de las opiniones de la empresa, las universidades, las instituciones políticas, los organismos públicos de investigación. Este libro recoge sus resultados.
    Keywords: Q ; AS1-945 ; DP1-402 ; Investigación científica ; Scientific research ; Universidades ; Universities ; bic Book Industry Communication::P Mathematics & science::PS Biology, life sciences::PSX Human biology::PSXM Medical anthropology
    Language: Spanish
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    E-BOOK
  • 2
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    An attenuation study in Southern Italy using local and regional earthquakes recorded by seismic network of Basilicata (2006)
    INGV
    Details
    Publication Date: 2019-11-04
    Description: We determined a set of empirical functions that describe the spectral amplitude decay of S-waves with distance in Southern Italy. We analyzed 32 earthquakes with magnitudes ML 2.0-5.4 and hypocentral distances ranging between 12 and 216 km. We obtained attenuation functions for 14 frequencies(1.0〈 f〈20.0 Hz). We compared these functions with average non-parametric attenuation functions reported by Castro et al. (1999) for different regions of Italy, and we observe that at low frequencies (f〈5.0 Hz) the spectral amplitudes from earthquakes in Southern Italy decay faster than the average. However, at high frequencies ( f 〉 5.0 Hz), the spectral amplitudes are above the average. At higher frequencies ( f 〉 10 Hz), the attenuation functions obtained for Southern Italy are slightly above the standard deviation of the average attenuation functions. It is possible that in this frequency range (10-20 Hz) site effects may influence the amplitude decay. In order to quantify the attenuation of the S-waves, we estimated the quality factor Q modeling the empirical attenuation functions using the following parametric form: A( f , r)=10/r b·e- pfR/Q ß; where 1.6 = f = 10.0 Hz is the frequency band with minimum effect of instrument and site response, r = 120 km is the distance range where the rate of decay of the spectral amplitudes is approximately constant, R=(r-10) and ß=3.2 km/s. We found that the exponent b=1.0±0.2 in the frequency band analyzed and Q shows a frequency dependence that can be approximated by the function Q=32.1 f 1.7.
    Description: Published
    Description: JCR Journal
    Description: open
    Keywords: seismic attenuation ; Southern Italy ; Q ; 04. Solid Earth::04.06. Seismology::04.06.99. General or miscellaneous
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
    Format: 1721738 bytes
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    PAPER (OA)
  • 3
    Electronic Resource
    Electronic Resource
    Direct determination of the oxidation reduction potential of the iron-quinone electron acceptor (Q) in photosystem II in Chlamydomonas reinhardtii
    Amsterdam : Elsevier
    FEBS Letters 145 (1982), S. 176-178 
    Details
    ISSN: 0014-5793
    Keywords: Chlamydomonas reinhardtii ; Iron-quinone ; Oxidation reduction potential ; Photosystem II ; Primary electron acceptor ; Q
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0014-5793(82)80161-0
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Ganoderic acid derivatives and ergosta-4,7,22-triene-3,6-dione from Ganoderma lucidum
    Amsterdam : Elsevier
    Phytochemistry 26 (1987), S. 2797-2803 
    Details
    ISSN: 0031-9422
    Keywords: Basidiomycetes ; Ganoderma lucidum ; O ; P ; Q ; R ; S ; cultured mycelia ; ergosta-4,7,22-triene-3,6-dione. ; ganoderic acids T ; triterpenoids
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0031-9422(00)83593-1
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  • 5
    Electronic Resource
    Electronic Resource
    Mt. Melbourne volcano, antarctica: Evidence of seismicity related to volcanic activity (1996)
    Springer
    Pure and applied geophysics 146 (1996), S. 305-318 
    Details
    ISSN: 1420-9136
    Keywords: Volcanic seismicity ; polarization analysis ; Q ; volcanic processes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Characterization of the microseismic activity (M L 〈2.0) has been performed at Mt. Melbourne since 1990. We recorded a group of low frequency events with common morphological characteristics, i.e., an emerging onset, an unclear second phase and a sharply dropping coda. Spectral analysis of events recorded at more than one station indicates that the seismogram characteristics and spectral content are largely due to source effects. A polarization filter applied to a set of three component data revealed a first phase made up ofP waves followed (after about 0.9–1.4 sec.) by a second phase probably composed ofSH-type waves. Particle motion analysis detected a seismic ray angle direction mainly between N70°E and N110°E and apparent angle of incidence between 35° and 48° for the first phase. The studied seismicity was localized in an area on the eastern slope of Mt. Melbourne Volcano which presents a surface temperature anomaly (Mazzarini andSalvini, 1994). We formulate two hypotheses for the type of earthquakes recorded: 1) long-period events involving active presence of magmatic fluids in the source processes; 2) or the result of fracturing processes (shear?) in a medium characterized by transition between brittle and plastic behaviors. In the latter hypothesis the superficial thermal anomaly may be a symptom of this behavior at depth and is confirmed by the lown values observed for the exponential fit in the codaQ analysis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00876495
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  • 6
    Electronic Resource
    Electronic Resource
    Neutrons from the B^1^1(p, n)C^1^1 reaction
    Amsterdam : Elsevier
    Nuclear Physics 65 (1965), S. 156-166 
    Details
    ISSN: 0029-5582
    Keywords: C^1^1 deduced levels ; C^1^2 deduced structure ; J, π ; NUCLEAR REACTIONS B^1^1(p, n), E = 4.0-11.5 MeV ; Natural target ; Q ; measured σ(E;E"n, θ)
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0029-5582(65)90303-2
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  • 7
    Electronic Resource
    Electronic Resource
    Q structure of the oceanic crust (1991)
    Springer
    Marine geophysical researches 13 (1991), S. 227-237 
    Details
    ISSN: 1573-0581
    Keywords: Q ; attenuation ; ophiolite ; oceanic crust ; velocity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Compressional wave attenuations and velocities have been measured as a function of confining pressure in ophiolite samples representing a cross-section of the oceanic crust and uppermost mantle. Data are presented for basalts, diabase dikes, gabbros and a suite of serpentinites and peridotites showing a range of serpentization. An ultrasonic pulse-echo spectral ratio technique was used to determine the attenuations to confining pressures of 500 MPa. From this data a Q profile for the oceanic crust and upper mantle is presented. Q is found to moderately increase with depth through the pillow basalts of the upper oceanic crust. The sheeted dike rocks of Layer 2C show an increase in Q with depth due to progressive metamorphism (from greenschist to amphibolite facies). Q drops abruptly from Layer 2C to Layer 3, though it is not clear why the gabbros have such low Q's. The crust-mantle boundary is a Q discontinuity; however, the Q contrast between Layer 3 and the upper mantle could be altered by upper mantle serpentinization, interlayered gabbros and peridotites at the boundary, or serpentinized peridotite diapirs intruding the gabbroic section. Q varies significantly with the percentage of serpentinization in the ultramafic samples, with the largest changes in Q being at the extremes of zero and full serpentinization. Q is sensitive to the overburden pressure for all of the samples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00369151
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  • 8
    Electronic Resource
    Electronic Resource
    Attenuation of short period seismic waves at Etna as compared to other volcanic areas (1987)
    Springer
    Pure and applied geophysics 125 (1987), S. 1039-1050 
    Details
    ISSN: 1420-9136
    Keywords: Q ; volcanic earthquakes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract CodaQ for Etna volcano is frequency dependent and theQ frequency pattern and the numerical values ranging from about 100 at 1 Hz to about 300 at 18 Hz are similar to the values obtained for other volcanoes: Campi Flegrei, Aeolian Islands and Hawaii. Moreover the frequency pattern and the numerical values of coda quality factor, for most of the seismically active zones of Italy are very different from those of the volcanic zones. Several studies of the location of magma chambers show the presence of magma pockets beneath Lipari and Vulcano Islands of the Aeolian archipelago and an anomalous low velocity body beneath Etna. These evidences suggest that a possible interpretation of the characteristic frequency pattern ofQ on volcanic areas is that the presence of magma can modify the scattering environment and consequently the codaQ estimates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00879367
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  • 9
    Electronic Resource
    Electronic Resource
    Attenuation properties of viscoelastic material (1989)
    Springer
    Pure and applied geophysics 131 (1989), S. 703-713 
    Details
    ISSN: 1420-9136
    Keywords: Attenuation ; viscoelastic material ; rheological models ; complex modulus ; stored and dissipated energies ; Q
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The attenuation properties of eight rheological models have been studied theoretically. The expressions forQ have been obtained by using dissipated and stored energies and/or complex modulus for each model. The dependence ofQ on frequency has been demonstrated. The three-element elastic model appears to be the best one to represent the viscoelastic nature of the earth's material for a finite value ofQ.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00876269
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  • 10
    Electronic Resource
    Electronic Resource
    Stratigraphic filtering (1990)
    Springer
    Pure and applied geophysics 132 (1990), S. 49-65 
    Details
    ISSN: 1420-9136
    Keywords: Multiple scattering ; dispersion ; earth filter ; Q ; random scattering
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract A plane-wave signal traveling at normal incidence through the earth's sedimentary layers attenuates, spreads, and changes waveform as it propagates, partly in response to “stratigraphic filtering” resulting from the buildup in the medium of intrabed multiples caused by the layering, and partly in response to absorption. This paper consists of a review of one-dimensional stratigraphic filtering. The action of stratigraphic filtering resembles that of absorption, and the filter's spectrum can be characterized by an effective quality factor. A comparison between the spectra of field data and synthetic data derived from absorption-free one-dimensional models suggests that in some geologic formations, stratigraphic filtering causes a significant fraction of the total attenuation evident on seismic records. In such studies, however, the simplicity of one-dimensional models leaves some uncertainty regarding the generality of the results. Nonetheless, one-dimensional stratigraphic filtering can serve as a useful metaphor that provides insight into the workings of more complex multi-dimensional scattering models.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00874357
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