Results 11 to 20 of about 25,605,949 (420)
Globally distributed iridium layer preserved within the Chicxulub impact structure. [PDF]
Sci Adv, 2021 The preservation of the iridium-rich layer within the Chicxulub crater captures the timing of the K-Pg boundary events. The Cretaceous-Paleogene (K-Pg) mass extinction is marked globally by elevated concentrations of iridium, emplaced by a hypervelocity ...
Goderis S +32 more
europepmc +2 more sources
Precise radiometric age establishes Yarrabubba, Western Australia, as Earth's oldest recognised meteorite impact structure. [PDF]
Nat Commun, 2020 The ~70 km-diameter Yarrabubba impact structure in Western Australia is regarded as among Earth’s oldest, but has hitherto lacked precise age constraints. Here we present U–Pb ages for impact-driven shock-recrystallised accessory minerals.
Erickson TM +4 more
europepmc +2 more sources
Continuous scavenging of broadband vibrations via omnipotent tandem triboelectric nanogenerators with cascade impact structure. [PDF]
Sci Rep, 2019 Ambient vibration energy is highly irregular in force and frequency. Triboelectric nanogenerators (TENG) can convert ambient mechanical energy into useable electricity.
Bhatia D +7 more
europepmc +2 more sources
Timing and origin of natural gas accumulation in the Siljan impact structure, Sweden. [PDF]
Nat Commun, 2019 Fractured rocks of impact craters may be suitable hosts for deep microbial communities on Earth and potentially other terrestrial planets, yet direct evidence remains elusive.
Drake H +8 more
europepmc +2 more sources
Communications Earth & Environment, 2021 Recent discoveries of extant and fossilized communities indicate that eukaryotes, including fungi, inhabit energy-poor and anoxic environments deep within the fractured igneous crust.
H. Drake +6 more
semanticscholar +1 more source
Advances in Civil Engineering, 2022 This paper presents a joint mode for a vertical grouting sleeve and a partially distributed reinforced composite connection. The seismic performance of four hybrids precast shear walls with a shear span ratio of 1.83, an axial compression ratio of 0.20 ...
Henglin Lv +4 more
doaj +1 more source
Chesapeake Bay Impact Structure Deep Drilling Project Completes Coring [PDF]
Scientific Drilling, 2006 No abstract available.
G. S. Gohn +4 more
doaj +3 more sources
Impact drag force exerting on a projectile penetrating into a hierarchical granular bed [PDF]
A&A 664, A147 (2022), 2022 Impact of a solid object onto a small-body surface can be modeled by the solid impact onto a hierarchically structured granular target. Impact drag force model for the hierarchically structured granular target is developed based on the experiment. We perform a set of granular impact experiments in which mechanical strength and porosity of target grains
arxiv +1 more source
The structural impact of DNA mismatches [PDF]
Nucleic Acids Research, 2015 The structure and dynamics of all the transversion and transition mismatches in three different DNA environments have been characterized by molecular dynamics simulations and NMR spectroscopy. We found that the presence of mismatches produced significant local structural alterations, especially in the case of purine transversions.
Rossetti +6 more
openaire +5 more sources
Riesite, a New High Pressure Polymorph of TiO2 from the Ries Impact Structure
Minerals, 2020 This paper describes riesite, a new high-pressure polymorph of TiO2 from the Ries impact structure, Germany. Riesite occurs in shock-induced melt veins within xenoliths of bedrock in suevite. It is structurally closely related to srilankite from which it
O. Tschauner +3 more
semanticscholar +1 more source