Investigation of alloying element Mg in the near surface layer of micro-arc oxidation coating on Al–Mg-Sc alloy

ABSTRACTThe diffusion of Sb and B markers has been studied in vacancy supersaturations produced by MeV Si implantation in float zone (FZ) silicon and bonded etch-back silicon-on-insulator (BESOI) substrates. MeV Si implantation produces a vacancy supersaturated near-surface region and an interstitial-rich region at the projected ion range. Transient enhanced diffusion (TED) of Sb in the near surface layer was observed as a result of a 2 MeV Si+, 1×1016/cm2, implant. A 4× larger TED of Sb was observed in BESOI than in FZ silicon, demonstrating that the vacancy supersaturation persists longer in BESOI than in FZ. B markers in samples with MeV Si implant showed a factor of 10× smaller diffusion relative to markers without the MeV Si+ implant. This data demonstrates that a 2 MeV Si+ implant injects vacancies into the near surface region.

Download Full-text

Observations of a thin near surface layer in an estuarine environment: An exceptional bloom of the dinoflagellate Akashiwo sanguinea in the Lee estuary (Lough Mahon), Co. Cork, in September 2010

Deep Sea Research Part II Topical Studies in Oceanography ◽

10.1016/j.dsr2.2012.12.008 ◽

2014 ◽

Vol 101 ◽

pp. 244-248 ◽

Cited By ~ 12

Author(s):

Shane O'Boyle ◽

Georgina McDermott

Keyword(s):

Surface Layer ◽

Estuarine Environment ◽

Near Surface ◽

Akashiwo Sanguinea

Download Full-text

Physical properties and spatial distribution of the sea ice surface layer (SSL/snow) during the autumn phase of the MOSAiC expedition

10.5194/egusphere-egu21-1467 ◽

2021 ◽

Author(s):

Ruzica Dadic ◽

Martin Schneebeli ◽

Henna-Reeta Hannula ◽

Amy Macfarlane ◽

Roberta Pirazzini

Keyword(s):

Surface Layer ◽

Spatial Distribution ◽

Sea Ice ◽

Physical Properties ◽

Surface Scattering ◽

Climate Feedback ◽

Energy Fluxes ◽

Scattering Layer ◽

Near Surface ◽

Ice Surface

<p>Snow cover dominates the thermal and optical properties of sea ice and the energy fluxes between the ocean and the atmosphere, yet data on the physical properties of snow and its effects on sea ice are limited. This lack of data leads to two significant problems: 1) significant biases in model representations of the sea ice cover and the processes that drive it, and 2) large uncertainties in how sea ice influences the global energy budget and the coupling of climate feedback. The &#160;MOSAiC research initiative enabled the most extensive data collection of snow and surface scattering layer (SSL) properties over sea ice to date. During leg 5 of the MOSAiC expedition, we collected multi-scale (microscale to 100-m scale) measurements of the surface layer (snow/SSL) over first year ice (FYI) and MYI on a daily basis. The ultimate goal of our measurements is to determine the spatial distribution of physical properties of the surface layer. During leg 5 of the MOSAiC expedition, that surface layer changed from the &#160;surface scattering layer (SSL), &#160; characteristic for the melt season, to an early autumn snow pack. Here, &#160;we will present data showing both a) the physical properties and the spatial distribution of the SSL during the late melt season and b) the transition of the sea ice surface from the SSL to the fresh autumn snowpack. The structural properties of this transition period are poorly documented, and this season is critical &#160;for the initialization of sea ice and snow models. Furthermore, these data are crucial to interpret simultaneous observations of surface energy fluxes, surface optical and remote sensing data (microwave signals in particular), near-surface biochemical activity, and to understand the sea ice &#160;processes that occur as the sea ice transitions from melting to freezing.</p>

Download Full-text

Deepening of domains at e-beam writing on the -Z surface of lithium niobate

Journal of Physics D Applied Physics ◽

10.1088/1361-6463/ac44c1 ◽

2021 ◽

Author(s):

Lyudmila Kokhanchik ◽

Evgenii Emelin ◽

Vadim Vladimirovch Sirotkin ◽

Alexander Svintsov

Keyword(s):

Surface Layer ◽

Electron Beam ◽

Lithium Niobate ◽

Electric Field ◽

Domain Walls ◽

Normal Component ◽

Beam Current ◽

Near Surface ◽

Domain Structures ◽

Sign Inversion

Abstract The focus of the study was to investigate the peculiarities of the domains created by electron beam (e-beam) in a surface layer of congruent lithium niobate, which comparable to a depth of electron beam charge penetration. Direct e-beam writing (DEBW) of different domain structures with a scanning electron microscope was performed on the polar -Z cut. Accelerating voltage 15 kV and e-beam current 100 pA were applied. Different patterns of local irradiated squares were used to create domain structures and single domains. No domain contrast was observed by the PFM technique. Based on chemical etching, it was found that the vertices of the domains created do not reach the surface level. The average deepening of the domain vertices was several hundred nanometers and varied depending on the irradiation dose and the location of the irradiated areas (squares) relative to each other. Computer simulation was applied to analyze the spatial distribution of the electric field in the various irradiated patterns. The deepening was explained by the fact that in the near-surface layer there is a sign inversion of the normal component of the electric field strength vector, which controls the domain formation during DEBW. Thus, with the help of e-beam, domains were created completely located in the bulk, in contrast to the domains that are nucleated on the surface of the -Z cut during the polarization inversion with AFM tip. The detected deepening of e-beam domains suggests the possibility of creating the “head-to-head” domain walls in the near-surface layer lithium niobate by DEBW.

Download Full-text

Transport Characteristics of the Near-Surface Layer of the Nucleus of Comet 67P/Churyumov–Gerasimenko

Solar System Research ◽

10.1134/s0038094621020040 ◽

2021 ◽

Vol 55 (2) ◽

pp. 106-123

Author(s):

V. Reshetnyk ◽

Yu. Skorov ◽

M. Vasyuta ◽

M. Bentley ◽

L. Rezac ◽

...

Keyword(s):

Surface Layer ◽

Near Surface ◽

Comet 67P

Download Full-text

Modification of the near surface layer of carbon steels with intense argon and nitrogen plasma pulses

Vacuum ◽

10.1016/j.vacuum.2005.01.023 ◽

2005 ◽

Vol 78 (2-4) ◽

pp. 181-186 ◽

Cited By ~ 6

Author(s):

B. Sartowska ◽

J. Piekoszewski ◽

L. Waliś ◽

W. Szymczyk ◽

J. Stanisławski ◽

...

Keyword(s):

Surface Layer ◽

Nitrogen Plasma ◽

Carbon Steels ◽

Near Surface

Download Full-text

Surface and Near-Surface Atom Dynamics During Low Energy Xe Ion Bombardment of Si and Fcc Surfaces

MRS Proceedings ◽

10.1557/proc-193-301 ◽

1990 ◽

Vol 193 ◽

Cited By ~ 3

Author(s):

M. V. R. Murty ◽

H. S. Lee ◽

Harry A. Atwater

Keyword(s):

Molecular Dynamics ◽

Surface Layer ◽

Ion Bombardment ◽

Low Energy ◽

Surface Processes ◽

Defect Production ◽

Near Surface ◽

Qualitative Nature ◽

Dynamics Simulations ◽

Atom Dynamics

ABSTRACTSurface and near-surface processes have been studied during low energy Xe ion bombardment of Si (001) and fcc surfaces using molecular dynamics simulations. Defect production is enhanced near the surface of smooth Si (001) surfaces with respect to the bulk in the energy range 20–150 eV, but is not confined exclusively to the surface layer. The extent and qualitative nature of bombardment-induced dissociation of small fcc islands on an otherwise smooth fcc (001) surface is found to depend strongly on island cohesive energy.

Download Full-text