Results 1 to 10 of about 196,285 (178)

‘Gold’ lost in restoration: Evaluation of core morphology of custom metal posts and cores, and analysis of precious metal debris [PDF]

open access: yesHeliyon
(1) Objectives: To investigate the deviations between the morphological dimensions of finished cores and desired dimensions made by three available fabricating techniques.
Yumin Wu   +3 more
doaj   +2 more sources

Statistical Models of the Distribution of Chemical Elements in Precambrian Rocks of the Siberian Craton

open access: yesSeparations, 2021
Natural chemical systems are an excellent object for studying the properties of various elements. The most diverse and informative geological complexes are crystalline rocks of the Precambrian.
Alexander Kravchenko   +5 more
doaj   +1 more source

Precious metal economy [PDF]

open access: yesCell Metabolism, 2006
The zebrafish is emerging as a system of choice for modeling human disease. In this issue of Cell Metabolism, Mendelsohn et al. (2006) describe a model for Menkes disease, a genetic disorder in copper utilization. Using genetic and chemical screens, the authors highlight the impact of maternal nutrition on embryo development.
Merchant, Sabeeha S., Sagasti, Alvaro
openaire   +2 more sources

Exploring the Impact of Zirconium Doping on the Mechanical and Thermodynamic Characteristics of Pt-40Rh Alloy through First-Principles Calculations

open access: yesCrystals, 2023
Zirconium (Zr) element doping has proven to be an effective strategy for reinforcing the strength and toughness of Pt-Rh alloys. However, the incorporation of Zr into Pt-Rh alloy in solid solution form renders its microstructural observation challenging ...
Fangzhou Li   +10 more
doaj   +1 more source

Brachiopods of the Imtachan Formation in the Upper Permian of the Southern Verkhoyanie, Northeast Russia

open access: yesУчёные записки Казанского университета: Серия Естественные науки, 2023
An extensive collection of fossil brachiopods, all assigned to the Wuchiapingian Stage, was recovered from the lower part of the Imtachan Formation along the Ustupnyi Creek (right tributary of the Setorym River) in the Southern Verkhoyanie.
R. V. Kutygin, V. I. Makoshin
doaj   +1 more source

Biostratigraphy of the terminal Carboniferous of the lower reaches of the Lena River (Kubalakh section, Russia)

open access: yesУчёные записки Казанского университета: Серия Естественные науки, 2021
The main objective of the study is to solve the question of the age and paleontological characteristics of the Kubalakh Formation of the Upper Paleozoic of the lower reaches of the Lena River.
V.I. Makoshin, R.V. Kutygin
doaj   +1 more source

North-Asian black shale ore-bearing megaprovince in the Northеastern Eurasia and its prospective minerogeny

open access: yesРуды и металлы, 2022
The North-Asian ore-bearing black shale megaprovince has first been distinguished in the northеastern Eurasia. Its distinguishing within the two contiguous platforms, the Siberian and East Siberian (buried under the Verkhoyansk-Kolyma folded area) ones ...
Vitalii S. Grinenko   +2 more
doaj   +1 more source

Ecological Risk Assessment of PTEs in Topsoils Impacted by Diamond Mining (Yakutia, Russia) [PDF]

open access: yesE3S Web of Conferences, 2023
The concentrations of potentially toxic elements (PTEs) in the topsoils of Udachny mining area were determined. The soil samples were taken from the 42 topsoil samples at a depth of 0-20 cm.
Gololobova Anna
doaj   +1 more source

Asselian–Sakmarian brachiopod zonation of the left bank of the lower reaches of the Lena River, Northeast Russia

open access: yesУчёные записки Казанского университета: Серия Естественные науки, 2022
This article summarizes the results of our study of the Early Permian brachiopods collected 5.9–6.3 km northwest of the village of Chekurovka that were used to develop the first biostratigraphic zonation of the Asselian–Sakmarian deposits on the left ...
V.I. Makoshin, R.V. Kutygin
doaj   +1 more source

POSSIBLE EVIDENCE FOR THE EXISTENCE OF VOLCANOGENIC MAGMATISM IN THE SINYAYA RIVER BASIN AT THE SOUTHERN FLANK OF THE VILYUI SYNECLISE

open access: yesГеодинамика и тектонофизика, 2023
The results of different-extension geological survey, exploration and thematic work methods show that the Vilyui syneclise is relatively amagmatic. However, the recent factual evidence in this region indicates the occurrence of magmatism of a different ...
V. V. Baranov   +7 more
doaj   +1 more source

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