Interface Waves

Dong, Hefeng; Jens, M.

doi:10.5772/19053

Cited by 4 publications

(2 citation statements)

References 16 publications

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“…The same holds for a possible depth dependence of the shear wave velocity in the unfrozen sediment layer, since our estimates of the velocity from the dispersion curve analysis were rough and limited in resolution. However, they agree with values derived from previous experiments at the seafloor as well as from theoretical studies [e.g., Stoll , ; Dong and Hovem , ; Vanneste et al ., ]. Uncertainties of peak frequencies ( f 0 ) are obviously negligible relative to the uncertainties in the shear wave velocity.…”

Section: Resultssupporting

confidence: 92%

Submarine permafrost depth from ambient seismic noise

Overduin

Haberland

Ryberg

et al. 2015

Geophysical Research Letters

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Permafrost inundated since the last glacial maximum is degrading, potentially releasing trapped or stabilized greenhouse gases, but few observations of the depth of ice-bonded permafrost (IBP) below the seafloor exist for most of the arctic continental shelf. We use spectral ratios of the ambient vibration seismic wavefield, together with estimated shear wave velocity from the dispersion curves of surface waves, for estimating the thickness of the sediment overlying the IBP. Peaks in spectral ratios modeled for three-layered 1-D systems correspond with varying thickness of the unfrozen sediment. Seismic receivers were deployed on the seabed around Muostakh Island in the central Laptev Sea, Siberia. We derive depths of the IBP between 3.7 and 20.7 m ± 15%, increasing with distance from the shoreline. Correspondence between expected permafrost distribution, modeled response, and observational data suggests that the method is promising for the determination of the thickness of unfrozen sediment.

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Section: Resultssupporting

confidence: 92%

Submarine permafrost depth from ambient seismic noise

Overduin

Haberland

Ryberg

et al. 2015

Geophysical Research Letters

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“…Moreover, one of the most favorable morphological characteristics of MOFs is their porous structure, which permits the inclusion of different guests. 23,24 Zn(OPE) 20,21 For example, an efficient ET was observed by incorporating an europium β-diketonate complex into the porous matrix of HKUST-1 MOF, making the material a photoantennae enhancing the emission of the lanthanide complex.…”

Section: Introductionmentioning

confidence: 99%

Efficient multicolor and white light emission from Zr-based MOF composites: spectral and dynamic properties

2015

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We report on the spectroscopy and dynamics of a Zr-naphthalene dicarboxylic acid (Zr-NDC) MOF interacting with three laser dyes: Coumarin 153 (C153), Nile Red (NR) and 4-(dicyanomethylene)-2-methyl-6-(4-dimethylaminostyryl)-4H-pyran (DCM) in diethyl ether (DE) suspensions. The photoexcitation of the MOF forming the composites (dyes@MOF) leads to an energy transfer (ET) to the trapped dyes, opening the door to tune the materials emission. Trapped C153 molecules exhibit two different ET dynamics. At lower C153 concentrations, the mean ET time process (from MOF monomers) is in ~3.3 ns, whereas at higher ones it is in ~360 ps. These mean ET times, which are guest-concentration dependent, reflect the different dye occupancies into the MOF pores. For trapped NR and DCM molecules, because of a different emission (energy donor) and absorption (energy acceptor) spectral overlap, the ET takes place from the excimers and not from the monomers. Solvent suspensions of Zr-NDC MOF trapping these three dyes show a multicolor, and white light emission, having quantum yields up to 41 %. More specifically, NR/C153@Zr-NDC in diethyl ether suspension gives three emission bands having their intensity maxima at ~385, ~500 and ~660 nm. This combination produces a white light, having CIE coordinates (0.32, 0.34) very near to the ideal ones (0.33, 0.33). Our findings open the door to develop fluorescence nanomaterial sensors and white light LEDs based on Zr-NDC MOF.

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