Results 21 to 30 of about 17,937 (217)
Nomenclature of the hydrotalcite supergroup: Natural layered double hydroxides [PDF]
, 2012 Layered double hydroxide (LDH) compounds are characterized by structures in which layers with a brucite-like structure carry a net positive charge, usually due to the partial substitution of trivalent octahedrally coordinated cations for divalent cations,
Christy, A.G. +4 more
core +1 more source
Trimerization of NaC2N3 to Na3C6N9 in the Solid [PDF]
, 2000 Sodium dicyanamide NaC2N3 was found to undergo two phase transitions. According to thermal analysis and temperature-dependent X-ray powder diffractometry, the transition of α-NaC2N3 (1a) to β-NaC2N3 (1b) occurs at 33°C and is displacive.
Irran, Elisabeth +3 more
core +1 more source
Cement, 2022 This study presents the influence of different curing temperatures and the availability of unbound H2O on the phase changes during the drying process of a simplified calcium aluminate cement bond castable. A mixture of CAC and alumina was hydrated for 48
A. Koehler +2 more
doaj +1 more source
Semionotiform fish from the Upper Jurassic of Tendaguru (Tanzania) [PDF]
Fossil Record, 1999 The late Late Jurassic fishes collected by the Tendaguru expeditions (1909–1913) are represented only by a shark tooth and various specimens of the neopterygian Lepidotes.
G. Arratia, H.-P. Schultze
doaj +1 more source
Pterodactylus scolopaciceps Meyer, 1860 (Pterosauria, Pterodactyloidea) from the Upper Jurassic of Bavaria, Germany:the problem of Cryptic Pterosaur Taxa in early ontogeny [PDF]
, 2014 The taxonomy of the Late Jurassic pterodactyloid pterosaur Pterodactylus scolopaciceps Meyer, 1860 from the Solnhofen Limestone Formation of Bavaria, Germany is reviewed. Its nomenclatural history is long and complex, having been synonymised with both P.
Martill, David M., Vidovic, Steven U.
core +5 more sources
Fossil eggshell cuticle elucidates dinosaur nesting ecology [PDF]
PeerJ, 2018 The cuticle layer consisting mainly of lipids and hydroxyapatite (HAp) atop the mineralized avian eggshell is a protective structure that prevents the egg from dehydration and microbial invasions.
Tzu-Ruei Yang +4 more
doaj +2 more sources
Structure determination of the reconstructed Au(110) surface [PDF]
, 1979 The LEED pattern of the Au(110) surface shows a (1 × 2) and also a (1× 3) superstructure. The (1 × 2) superstructure has been determined by comparison of LEED intensities with model calculations. The missing row model is the most probable model.
Bonzel +12 more
core +1 more source
, 1963 Number of Pages: 2Place of Publication: Bethesda, MarylandIntegrative BiologyGeological ...
Neill, Wilfred T.
core +1 more source
Geology, age and tectonic evolution of the Sierra Maestra Mountains, southeastern Cuba
Geologica Acta, 2006 We summarize the available geological information on the Sierra Maestra Mountains in southeastern Cuba and report new zircon fission track and biotite Ar-Ar ages for this region. Two different and genetically unrelated volcanic arc sequences occur in the
Franz Neubauer +4 more
doaj +1 more source
Quantitative histological models suggest endothermy in plesiosaurs [PDF]
PeerJ, 2018 Background Plesiosaurs are marine reptiles that arose in the Late Triassic and survived to the Late Cretaceous. They have a unique and uniform bauplan and are known for their very long neck and hydrofoil-like flippers.
Corinna V. Fleischle +2 more
doaj +2 more sources