Results 91 to 100 of about 64,792 (321)

Scientific drilling of the Boltysh impact crater, Ukraine [PDF]

open access: yes, 2009
Introduction: The Boltysh crater has been known for several decades and was first drilled in the 1960s as part of a study of economic oil shale deposits. Unfortunately, the cores were not curated and have been lost.
Gilmour, I.   +3 more
core  

Mixed evidence for disturbance‐mediated apparent competition for declining caribou in western British Columbia, Canada

open access: yesThe Journal of Wildlife Management, EarlyView.
Investigating the decline of a caribou population in central British Columbia, we found that 1) recent wildfires were a stronger draw for primary ungulate prey than cutblocks, 2) most predators were associated with primary prey but had mixed responses to disturbance, and 3) caribou used cutblocks, potentially increasing their risk.
Katie Tjaden‐McClement   +7 more
wiley   +1 more source

Morphological Features-Based Descriptive Index System for Lunar Impact Craters

open access: yesISPRS International Journal of Geo-Information, 2017
Lunar impact craters are important for studying lunar surface morphology because they are the most typical morphological units of the Moon. Impact crater descriptive indices can be used to describe morphological features and thus provide direct evidence ...
Min Chen   +5 more
doaj   +1 more source

A Second Large Subglacial Impact Crater in Northwest Greenland? [PDF]

open access: yes
Following the discovery of the Hiawatha impact crater beneath the northwest margin of the Greenland Ice Sheet, we explored satellite and aerogeophysical data in search of additional such craters.
Bottke, William F., Jr.   +7 more
core   +1 more source

Seasonal patterns of phytoplankton photoacclimation in a dimictic oligotrophic lake over 5 yr: Implications for chlorophyll as an estimate of biomass

open access: yesLimnology and Oceanography, EarlyView.
Abstract Chlorophyll a is commonly used as a surrogate for algal biomass in lakes and oceans even though phytoplankton can readily adjust intracellular chlorophyll concentration to changes in the environment through a cellular process termed photoacclimation.
Scott Girdner, Joshua Sprague
wiley   +1 more source

Ries impact deposits in the North Alpine Foreland Basin of Germany as a terrestrial analog site for impact-produced seismites and sand spikes on planet Mars

open access: yesAIMS Geosciences
The North Alpine foreland basin (NAFB) in Germany is characterized by various types of sedimentologic features that make it an excellent terrestrial analog of regions affected by high-energy asteroid impact-quakes on Mars.
Elmar Buchner   +2 more
doaj   +1 more source

Solid Particle Erosion Behaviors of Walnut Shell‐Filled Acrylic‐Styrene‐Acrylate (ASA) and Polycarbonate/Acrylic‐Styrene‐Acrylate (PC/ASA) Thermoplastic Blend Biocomposites

open access: yesPolymer Composites, EarlyView.
A schematic illustrating WS‐reinforced composite erosion testing at 34 m/s across 30°–90° impingement angles, with SEM views of the eroded surfaces and a trend of resistance gains via hardness, toughness, interfacial strength, and energy dissipation. ABSTRACT The aim of this study is to investigate the solid particle erosion behavior of walnut shell ...
Harun Sepetcioglu   +3 more
wiley   +1 more source

Whump, Slosh, Slosh, Slosh—Filling the Crater That Did in the Dinosaurs

open access: yesAGU Advances, 2020
Drilling into the Chicxulub crater (Yucatan, Mexico) reveals the dramatic aftermath of the dinosaur‐killing meteorite impact. Previous views of this event have mainly come from places well away from Ground Zero, where we see the extinction of ~70% of ...
Richard Norris
doaj   +1 more source

Hypervelocity impact study: The effect of impact angle on crater morphology [PDF]

open access: yes
The Space Power Institute (SPI) of Auburn University has conducted preliminary tests on the effects of impact angle on crater morphology for hypervelocity impacts. Copper target plates were set at angles of 30 deg and 60 deg from the particle flight path.
Best, Steve   +5 more
core   +1 more source

Environmental Conditions in the Late Pleistocene at the Southern Margin of the European Periglacial Domain (Hungary) Inferred From Quartz Grain Microtextures

open access: yesPermafrost and Periglacial Processes, EarlyView.
ABSTRACT The paper investigates environmental conditions prevailing at the southern margin of the European periglacial domain in NW Hungary (Kemeneshát area) during the Late Pleistocene. Samples of sediments infilling sand wedges and their host sediments were analyzed by examining the grain‐size distributions, as well as the morphology and ...
Beáta Farkas   +3 more
wiley   +1 more source

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