Results 71 to 80 of about 65,019 (260)

Choosing optimal exposure times for XRF core‐scanning: Suggestions based on the analysis of geological reference materials [PDF]

open access: yesGeochemistry, Geophysics, Geosystems, 2016
AbstractX‐ray fluorescence (XRF) core‐scanning is a fast and nondestructive technique to assess elemental variations of unprocessed sediments. However, although the exposure time of XRF‐scanning directly affects the scanning counts and total measurement time, only a few studies have considered the influence of exposure time during the scan.
Jyh‐Jaan Huang   +6 more
openaire   +1 more source

Lithological Constraints on Borehole Wall Failure; a Study on the Pennine Coal Measures of the United Kingdom

open access: yesFrontiers in Earth Science, 2019
Stress-related borehole deformation features have been documented across the United Kingdom, most commonly as borehole breakouts and drilling induced tensile fractures (DIFs). Recent studies using borehole imaging have allowed more detailed investigation
Mark W. Fellgett   +7 more
doaj   +1 more source

Bighorn Basin Coring Project (BBCP): a continental perspective on early Paleogene hyperthermals [PDF]

open access: yesScientific Drilling, 2013
During the summer of 2011, the Bighorn Basin Coring Project (BBCP) recovered over 900 m of overlapping core from 3 different sites in late Paleocene to early Eocene fluvial deposits of northwestern Wyoming.
W. C. Clyde   +13 more
doaj   +1 more source

Chondrule olivine: Relationship between structure and composition using synchrotron X-ray Laue microdiffraction [PDF]

open access: yes, 2006
Published ...
Benedix, GK   +4 more
core  

Regional environmental change versus local signal preservation in Holocene thermokarst lake sediments: A case study from Herschel Island, Yukon (Canada) [PDF]

open access: yes, 2018
Thermokarst lakes cover nearly one fourth of ice-rich permafrost lowlands in the Arctic. Sediments from an athalassic subsaline thermokarst lake on Herschel Island (69°36′N; 139°04′W, Canadian Arctic) were used to understand regional changes in climate ...
Frenzel, Peter   +8 more
core   +1 more source

Quantifying Additive Manufacturing Vapor Plumes Using Laser‐Induced Breakdown Spectroscopy, Synchrotron X‐Ray Radiography and Simulations

open access: yesAdvanced Science, EarlyView.
This study presents a novel in situ laser‐induced breakdown spectroscopy system for monitoring metal vapors produced by the intense laser‐metal interactions in laser powder bed fusion additive manufacturing and laser welding. The insights from this new technique reveal changes in alloy compositions and provide the first in situ validation of multi ...
Anna C. M. Getley   +8 more
wiley   +1 more source

A high-altitude peatland record of environmental changes in the NW Argentine Andes (24 ° S) over the last 2100 years [PDF]

open access: yes, 2016
High-altitude cushion peatlands are versatile archives for high-resolution palaeoenvironmental studies, due to their high accumulation rates, range of proxies, and sensitivity to climatic and/or human-induced changes. Especially within the Central Andes,
Hense, Jonathan   +7 more
core   +3 more sources

Durable Thin‐Film Porous Transport Electrodes for High Current Density PEM Water Electrolysis

open access: yesAdvanced Science, EarlyView.
Water electrolysis using porous transport electrodes with sputter‐deposited, ionomer‐free thin films of rutile IrO2 catalyst suppresses Ir dissolution by >10x over other forms of IrOx. The rutile IrO2 catalyst prepared by this readily scalable electrode synthesis method provides stable cell operation at 3 A cm−2 while using low Ir loading (0.4 mg Ir cm−
James L. Young   +18 more
wiley   +1 more source

Astronomical calibration of the Ypresian timescale: implications for seafloor spreading rates and the chaotic behavior of the solar system? [PDF]

open access: yesClimate of the Past, 2017
To fully understand the global climate dynamics of the warm early Eocene with its reoccurring hyperthermal events, an accurate high-fidelity age model is required.
T. Westerhold   +6 more
doaj   +1 more source

Spitzer Characterization of Dust in the Ionized Medium of the Large Magellanic Cloud [PDF]

open access: yes, 2011
A systematic investigation of dust emission associated with the ionized gas has so far been performed only in our Galaxy and for wavelengths longer than 60 {\mu}m.
Akiko Kawamura   +37 more
core   +2 more sources

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