A5077760549- Cryospheric studies and observations
- Geology and Paleoclimatology Research
- Winter Sports Injuries and Performance
- Climate change and permafrost
- Polar Research and Ecology
- Arctic and Antarctic ice dynamics
- Landslides and related hazards
- Semiconductor materials and devices
- Icing and De-icing Technologies
- Methane Hydrates and Related Phenomena
- Seismic Waves and Analysis
- Membrane Separation Technologies
- Polymer Nanocomposites and Properties
- Planetary Science and Exploration
- Electronic and Structural Properties of Oxides
- Force Microscopy Techniques and Applications
- Advanced Sensor and Energy Harvesting Materials
- Geophysical Methods and Applications
- Ferroelectric and Negative Capacitance Devices
- Analytical Chemistry and Sensors
- Graphene research and applications
- Advancements in Semiconductor Devices and Circuit Design
- Polymer Surface Interaction Studies
- Advanced Polymer Synthesis and Characterization
- Fuel Cells and Related Materials
Technion – Israel Institute of Technology
2024-2025
Argonne National Laboratory
2025
University of Colorado Boulder
1998-2024
St. Olaf College
2003-2023
Sandia National Laboratories
2020
Vanderbilt University
2016
Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung
2013
Centre for Polar Observation and Modelling
2004
University of Bristol
2004
The University of Texas at Austin
2004
Abstract. We present Bedmap2, a new suite of gridded products describing surface elevation, ice-thickness and the seafloor subglacial bed elevation Antarctic south 60° S. derived these using data from variety sources, including many substantial surveys completed since original Bedmap compilation (Bedmap1) in 2001. In particular, Bedmap2 ice thickness grid is made 25 million measurements, over two orders magnitude more than were used Bedmap1. most parts Antarctica landscape visible much...
Abstract. We present Bedmap2, a new suite of gridded products describing surface elevation, ice-thickness and the seafloor subglacial bed elevation Antarctic south 60° S. derived these using data from variety sources, including many substantial surveys completed since original Bedmap compilation (Bedmap1) in 2001. In particular, Bedmap2 ice thickness grid is made 25 million measurements, over two orders magnitude more than were used Bedmap1. most parts Antarctica landscape visible much...
Abstract. One of the key components this research has been mapping Antarctic bed topography and ice thickness parameters that are crucial for modelling flow hence predicting future loss ensuing sea level rise. Supported by Scientific Committee on Research (SCAR), Bedmap3 Action Group aims not only to produce new gridded maps international scientific community, but also standardize make available all geophysical survey data points used in producing Bedmap products. Here, we document latest...
Atomic layer deposition (ALD) is a versatile technique for engineering the surfaces of porous polymers, imbuing flexible, high-surface-area substrates with inorganic and hybrid material properties. Previously reported enhancements include fouling resistance, electrical conductance, thermal stability, photocatalytic activity, hydrophilicity, oleophilicity. However, there are many poorly understood phenomena that introduce challenges in applying ALD to polymers. In this paper, we address five...
Abstract Radar profiles of bed echo intensity can survey conditions at the ice–bed interface and test for presence or absence water. However, extracting information about basal from intensities requires an estimate attenuation loss through ice. We used relationship between constant-offset radar data ice thickness to depth-averaged rates several locations on near Kamb Ice Stream (KIS), West Antarctica. found values varying 29 dBkm –1 Siple Dome 15 in main trunk region KIS, agreement with a...
Abstract From its original formulation in 1990 the International Trans-Antarctic Scientific Expedition (ITASE) has had as primary aim collection and interpretation of a continent-wide array environmental parameters assembled through coordinated efforts scientists from several nations. ITASE offers ground-based opportunities traditional-style traverse travel coupled with modern technology GPS, crevasse detecting radar, satellite communications multidisciplinary research. By operating...
Molecular layer deposition (MLD) provides the opportunity to perform condensation polymerization one vaporized monomer at a time for creation of precise, selective nanofilms desalination membranes. Here, we compare structure, chemistry, and morphology two types commercial interfacial polymerzation (IP) membranes with lab-made MLD films. M-phenylenediamine (MPD) trimesoyl chloride (TMC) produced cross-linked, aromatic polyamide often used in reverse osmosis growth rates 2.9 Å/cycle 115 °C....
ABSTRACT The resistance of polymers to solvents is a critical property for their integration into applications such as medical devices, energy storage, and membranes. Sequential infiltration synthesis (SIS) promising technique enhancing the chemical stability polymers, minimizing solvent dissolution, through vapor phase‐based growth inorganic materials within polymers. SIS effective in with functional groups that are reactive precursors, polymethylmethacrylate (PMMA), but ineffective lack...
Upstream of Byrd Station (West Antarctica), ice-penetrating radar data reveal a distinctive fold structure within the ice, in which isochronous layers are unusually deep. The has an axis more than 50 kilometers long, is aligned up to 45 degrees ice flow direction. Although explanations for fold's formation under present problematic, it can be explained if was parallel approximately 1500 years ago. This change may associated with stream alterations nearer margin. If this true, central West...
We collected 1850 km of ground‐based radio echo‐sounding (RES) data in West Antarctica along the 2001 US leg International Trans‐Antarctic Scientific Expedition traverse (US‐ITASE). These represent first high‐resolution measurements ice thickness and internal stratigraphy for portions this area that bear on questions about stability Antarctic Ice Sheet (WAIS). Internal layers depicting isochrones have been traced continuously much profile length a date from Byrd Deep Core is ascribed to one...
Abstract. Over the past 60 years, scientists have strived to understand past, present and future of Antarctic Ice Sheet. One key components this research has been mapping bed topography ice thickness parameters that are crucial for modelling flow hence predicting loss ensuing sea level rise. Supported by Scientific Committee on Research (SCAR), Bedmap3 Action Group aims not only produce new gridded maps international scientific community, but also standardize make available all geophysical...
Abstract Deep radar soundings as part of the International Trans-Antarctic Scientific Expedition (US-ITASE) traverses in West Antarctica have revealed a bright internal reflector that we imaged throughout widespread locations across ice sheet. The layer is seen emanating from Byrd Station four directions and has been traced continuously for distances 535km toward Weddell Sea drainage, 500km South Pole, 150km Executive Committee Range 160km Kamb Ice Stream (former C). approximate area...
Abstract. Ground-based radio echo sounding data acquired along the 1700 km US-ITASE traverse have been used to determine ice attenuation and relative basal reflectivity across major catchments funneling from East Antarctica Ross Ice Shelf. We find that varies locally by up 40 dB which we interpret as due changes in phase state at bed. Some, though not all, areas of high local are observed flat-lying bed reflections indicative sub-glacial lakes. compare balance velocity a general association...
Cycling stability is central to implementing silicon (Si) anodes in next-generation high-energy lithium-ion batteries. However, challenges remain due the lack of effective strategies enhance structural integrity anode during electrochemical cycling. Here, we develop a nanoscale polyamide coating, using spatial molecular layer deposition (MLD) m-phenylenediamine and trimesoyl chloride precursors, preserve Si anodes. Poly(acrylic acid) (PAA) has been widely used Si-based as binding agent its...
Abstract High-resolution maps of the glacier bed are developed through a pseudo-three-dimensional migration dense array radio-echo sounding profiles. Resolution three-dimensional subglacial surfaces is determined by wavelength, data sparing in field, and migration. Based on synthetic profile experiments, maximum resolution final map cannot exceed one half-wavelength. A methodology field processing techniques outlined to develop maximum-resolution bed. The used below part Worthington Glacier,...
Measurements of the deformation a dense array boreholes in Worthington Glacier, Alaska, show that glacier moves with generally bed‐parallel motion. Strain 200 m deep valley is constant near surface but follows nonlinear vertical profile below depth about 120 m. By 180 m, octahedral strain rate reaches 0.35 yr −1 . The three‐dimensional velocity field shows spatial complexity significant deviations from plane strain, despite relatively simple geometry vicinity 6×10 6 3 study volume. No...
We present glaciological and climatological characteristics of Hercules Dome, Antarctica (86°S, 105°W), which demonstrate its potential as a deep ice core site. Annual layering in δ D ratios from 72 m collected by the US‐ITASE 2002 traverse indicate accumulation rates 0.16–0.20 m/yr equivalent over last 300 years. Age control stratigraphy seen radio‐echo sounding data during same suggests rate 0.09–0.11 averaged past 18,000 Ice also indicates that divide position has been stable through at...
Abstract The 2006/07 and 2007/08 US-ITASE traverses from Taylor Dome to South Pole in East Antarctica provided opportunities survey the subglacial englacial environments using 3 MHz 200MHz radar. We present first results of these new ground-based radar data. A prominent basal deformation layer indicates different ice-flow regimes for northern southern halves Byrd Glacier drainage. Buried dune stratigraphy that appears be related megadunes towards west occurs at depths up 1500 m. At least two...
Molecular layer deposition (MLD) is able to produce ultrathin polymer films with control over thickness, cross-linking, and chemical composition. With these capabilities, MLD should be useful in the fabrication of novel membranes on porous supports. However, confining a continuous film surface substrates difficult because growth pores. The pores lowers conductance support. This paper presents method deposit top substrates. In this method, Al2O3 plasma-enhanced atomic (PE-ALD) using...
Abstract Ice stratigraphy from deep-penetrating radar data collected during the 2002 US International Trans-Antarctic Scientific Expedition (US-ITASE) traverse shows evidence of a significant erosion surface and drift-filled basin related to previously undiscovered 1400m subglacial mountain between Hercules Dome (87 ˚ 42 0 S, 108 W) South Pole. The 3MHz profile crosses three mountains at approximately 45 8 ice-flow direction. Cross-cutting reflectors in top 500m ice are interpreted as...
Abstract Flow stripes seen in satellite imagery of ice streams and shelves are caused by surface undulations with kilometer-scale spacing meter-scale relief generally indicate current or recent fast flow. On a similar scale, folding internal stratigraphy depicted cross-flow ice-penetrating radar profiles is also common occurrence streams, suggesting possible relationship between the two sets features. We have traced flow RADARSAT MODIS on Kamb Ice Stream, West Antarctica, from onset...
Abstract. Variations in properties controlling ice flow (e.g., topography, accumulation rate, basal friction) are recorded by structures glacial stratigraphy. When anomalies that disturb the stratigraphy fixed space, they produce advect away from source and can be used to trace pathways reconstruct ice-flow patterns of past. Here we provide an example one these persistent tracers: a prominent unconformity layering originates at Mt. Resnik, part subglacial volcanic complex near Kamb Ice...