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  • 1
    Electronic Resource
    Electronic Resource
    Spatial solitons in photorefractive Bi12TiO20 with drift mechanism of nonlinearity (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 64 (1994), S. 408-410 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The analysis performed shows that in cubic photorefractive crystals (of Bi12SiO20 and GaAs type in particular) with drift ("quasilocal'') mechanism of optical nonlinearity spatial soliton propagation can be observed for reasonable external dc electric fields 10–15 kV/cm. These photorefractive solitons which can be excited at very low cw laser power are stable in a broad region of signal(soliton)/incoherent(spatially uniform) intensity ratio, and allow easy switching from bright to dark type. Original experimental results of self-channeling of submicrowatt HeNe laser beam in a cubic Bi12TiO20 sample under external dc field are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.111163
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    Paper (German National Licenses)
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  • 2
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    Accretion rates in coastal wetlands of the southeastern Gulf of California and their relationship with sea-level rise (2016)
    Sage
    In: Holocene
    Details
    Publication Date: 2016-06-28
    Description: Sea-level rise (SLR) is one of the most conspicuous examples of the environmental impact of recent climate change. Since SLR rates are not uniform around the planet, local and regional data are needed for proper adaptation plans. 210 Pb-dated sediment cores were analyzed to determine the trends of sediment accretion rates (SARs) at three tropical saltmarshes in the Estero de Urias lagoon (Gulf of California, Mexico), in order to estimate the SLR trends during the past ~100 years, under the assumption that these ecosystems accrete at a similar rate to SLR. A chemometric approach, including multivariate statistical analysis (factor analysis) of geochemical data (including 13 C; 15 N; C/N ratios; and Br, Na, and Cl as proxies for marine transgression) was used to identify the marine transgression in the sediment records. Based on core geochemistry, only one of the three cores provided a long-term record attributable to marine transgression. SLR trends, estimated from SARs, showed increasing values, from a minimum of 0.73 ± 0.03 mm yr –1 at the beginning of the 20th century and up to 3.87 ± 0.12 mm yr –1 during the period 1990–2012. The estimated SLR trend between 1950 and 1970 was comparable to the tide gauge records in Mazatlan City for the same period. Results showed the caveats and strengths of this methodology to reconstruct decadal SLR trends from the sedimentary record, which can be used to estimate long-term SLR trends worldwide in regions where monitoring data are scarce or absent.
    Print ISSN: 0959-6836
    Electronic ISSN: 1477-0911
    Topics: Geography , Geosciences
    Published by Sage
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    PAPER CURRENT
  • 3
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    Propagación de la onda de marea en canales adyacentes a Campos de Hielo Sur (2007)
    Comité Oceanográfico Nacional
    Details
    Publication Date: 2021-05-19
    Description: During the research cruise Cimar-Fiordo 2, carried out in late 1996, sea level was recorded in three stations located in channels, Messier (Puerto Edén), Wide (Punta Beresford) and Concepción (Caleta Patria). The measurements were of short term, starting in October 20th and finishing in December 13th, 1996. The sea level in those stations, was analyzed in the time and frequency dominion, and some tide non harmonic values were calculated. Results showed that tides evident influence in sea level signal, with a clear mixt semidiurnal behavior, and a daily inequality between high and low waters. The highest tide range was observed in puerto Edén, showing the effect of the local orography configuration while the wave propagates into the channel, and experiences non linear effects modification. The low frequency sea level signal is perceptible even it has very small amplitude. However, due to the series short length it was not possible a proper resolution of the low frequency energy spectrum. From the spectral analysis, was clearly advisable that tides is the most energetic phenomenon that shows its biggest expression particularly in the semidiurnal frequency in all stations.
    Description: Published
    Keywords: Tides ; Spectral analysis ; Sea level ; Tides ; Harmonic analysis ; Spectral analysis ; Sea level ; Cruises ; Sea level changes ; Monitoring systems ; Tidal dynamics ; Tidal waves ; Ice fields
    Repository Name: AquaDocs
    Type: Journal Contribution
    Format: 797799 bytes
    Format: application/pdf
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  • 4
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    Caracterización del régimen de mareas y corrientes a lo largo del canal Moraleda (43° 54' S - 45° 17' S) (2007)
    Comité Oceanográfico Nacional
    Details
    Publication Date: 2021-05-19
    Description: Sea level and currents in “Boca del Guafo” and Moraleda channel are studied using statististical and Fourier (harmonic) analyses. The data were collected using oceanographic instruments that covered a wide geographical area, from the northern most point of Moraleda channel to Darwin channel. The results of the harmonic analysis indicated that the area has a semidiurnal tide with a 12-minute phase shift between the ports of Melinka and Lagunas. This result shows that the tidal wave does not only propagate along the Moraleda channel, but at the same time enters the region through several transversal channels that connect the Pacific Ocean with the Moraleda channel. Along the main channel (Moraleda) no reverse current was recorded, which is an unusual characteristic for the channels and inlets in the Chilean Inland Seas. The main reason for this unexpected behavior is due to the fact that currents are also forced by long period disturbances that could be related to meteorological processes. The maximum currents recorded were 66.5 cm/s and 53.7 cm/s at stations SHOA-2 and SHOA-1, respectively.
    Description: Published
    Keywords: Tides ; Ocean currents ; Sea level ; Tides ; Ocean currents ; Channels ; Current velocity ; Sea level
    Repository Name: AquaDocs
    Type: Journal Contribution
    Format: 368719 bytes
    Format: application/pdf
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