Holographic camera and display using a flat diffusive layer (Conference Presentation)

2018 ◽  
Author(s):  
YongKeun Park
Keyword(s):  
Diffusive Layer

scholarly journals Development and evaluation of a ceramic diffusive layer based DGT technique for measuring organic micropollutants in seawaters

2021 ◽  
Vol 156 ◽  
pp. 106653
Author(s):  
Huaijun Xie ◽  
Yingchao Dong ◽  
Jingwen Chen ◽  
Xueling Wang ◽  
Mao Fu
Keyword(s):  
Organic Micropollutants ◽  
Diffusive Layer

New anodic diffusive layer for passive micro-direct methanol fuel cell

2009 ◽  
Vol 192 (2) ◽  
pp. 423-428 ◽  
Author(s):  
Ting Yuan ◽  
Zhiqing Zou ◽  
Mei Chen ◽  
Zhilin Li ◽  
Baojia Xia ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Direct Methanol Fuel Cell ◽  
Direct Methanol ◽  
Methanol Fuel Cell ◽  
Diffusive Layer

scholarly journals Subsurface diffusion in crystals and effect of surface permeability on the atomic step motion

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Sergey Kosolobov
Keyword(s):  
Point Defects ◽  
Atomic Step ◽  
Surface Point ◽  
Atomic Steps ◽  
Sources And Sinks ◽  
Step Rate ◽  
Step Motion ◽  
Surface Permeability ◽  
Diffusive Layer ◽  
Effect Of Surface

Abstract A new theoretical approach to characterize the diffusion of both surface and bulk point defects in crystals is presented. In our model, atomic steps are considered as sources and sinks not only for adatoms and advacancies but also for self-interstitials and bulk vacancies, providing a new mechanism for bulk point defect generation and annihilation. It is shown that the creation and annihilation of self-interstitials and vacancies occur at atomic steps and can be described by introducing a diffusive layer of the bulk point defects adsorbed just below the surface. The atomic step rate of advance is studied taking into account finite permeability of the surface for bulk and surface point defects. The surface permeability results in the appearance of the dependence of the total step rate of advance not only on the supersaturation in vapor phase but also on the supersaturation of point defects in the bulk.

scholarly journals Scattering Attenuation of the Martian Interior through Coda-Wave Analysis

2021 ◽  
Author(s):  
Foivos Karakostas ◽  
Nicholas Schmerr ◽  
Ross Maguire ◽  
Quancheng Huang ◽  
Doyeon Kim ◽  
...  
Keyword(s):  
High Frequency ◽  
Low Frequency ◽  
Scattered Wave ◽  
Coda Wave ◽  
Very High Frequency ◽  
Scattering Layer ◽  
Scattering Attenuation ◽  
Trade Offs ◽  
Scattering Strength ◽  
Diffusive Layer

ABSTRACT We investigate the scattering attenuation characteristics of the Martian crust and uppermost mantle to understand the structure of the Martian interior. We examine the energy decay of the spectral envelopes for 21 high-quality Martian seismic events from sols 128 to 500 of InSight operations. We use the model of Dainty, Toksöz, et al. (1974) to approximate the behavior of energy envelopes resulting from scattered wave propagation through a single diffusive layer over an elastic half-space. Using a grid search, we mapped the layer parameters that fit the observed InSight data envelopes. The single diffusive layer model provided better fits to the observed energy envelopes for high-frequency (HF) and very-high-frequency (VF) than for the low-frequency and broadband events. This result is consistent with the suggested source depths (Giardini et al., 2020) for these families of events and their expected interaction with a shallow scattering layer. The shapes of the observed data envelopes do not show a consistent pattern with event distance, suggesting that the diffusivity and scattering layer thickness is nonuniform in the vicinity of InSight at Mars. Given the consistency in the envelope shapes between HF and VF events across epicentral distances and the trade-offs between the parameters that control scattering, the dimensions of the scattering layer remain unconstrained but require that scattering strength decreases with depth and that the rate of decay in scattering strength is the fastest near the surface. This is generally consistent with the processes that would form scattering structures in planetary lithospheres.

scholarly journals Impact of Thermally Driven Turbulence on the Bottom Melting of Ice

2016 ◽  
Vol 46 (4) ◽  
pp. 1171-1187 ◽  
Author(s):  
T. Keitzl ◽  
J. P. Mellado ◽  
D. Notz
Keyword(s):  
Laboratory Experiments ◽  
Scaling Laws ◽  
Rate Increase ◽  
Strong Temperature Dependence ◽  
Far Field ◽  
Field Temperature ◽  
Thermally Driven ◽  
Flow Features ◽  
Ice Water ◽  
Diffusive Layer

AbstractDirect numerical simulation and laboratory experiments are used to investigate turbulent convection beneath a horizontal ice–water interface. Scaling laws are derived that quantify the dependence of the melt rate of the ice on the far-field temperature of the water under purely thermally driven conditions. The scaling laws, the simulations, and the laboratory experiments consistently yield that the melt rate increases by two orders of magnitude, from ⋍101 to ⋍103 mm day−1, as the far-field temperature increases from 4° to 8°C. The strong temperature dependence of the melt rate is explained by analyzing the vertical structure of the flow: For far-field temperatures below 8°C, the flow features a stably stratified, diffusive layer next to the ice that shields it from the warmer, turbulent outer layer. The stratification in the diffusive layer diminishes as the far-field temperature increases and vanishes for far-field temperatures far above 8°C. Possible implications of these results for ice–ocean interfaces are discussed. The drastic melt-rate increase implies that turbulence needs to be considered in the analysis of ice–water interfaces even in shear-free conditions.

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