Results 61 to 70 of about 61,474 (312)

U-Pb dating of calcite in ancient carbonates for age estimates of syn- to post-depositional processes: a case study from the upper Ediacaran strata of Finnmark, Arctic Norway [PDF]

, 2020
Results of in situ U-Pb dating of calcite spherulites, cone-in-cone (CIC) calcite and calcite fibres from a calcareous concretion of the upper Ediacaran of Finnmark, Arctic Norway, are reported.

core   +1 more source

Development of a sustainable water treatment process using biochar as substrate for filtration and coliform removal

The Canadian Journal of Chemical Engineering, EarlyView.
Preparation, modification, and characterization of biochar from woodchips and its application in stream water filtration, evaluated through physicochemical and microbiological analyses. Abstract Global microbial water contamination affects 1.8 billion people, necessitating efficient and sustainable treatment methods.
Tariq Khalil, Muhammad Ishtiaq Ali, Rameesha Abid, Anab Mujtaba, Rabia Asghar, Asif Jamal, Yusuf Tutar, Ahsan Habib, Fakhraddin Yusubov   +8 more
wiley   +1 more source

Isotopic-geochemical features of thermal water of the Kyndyg deposit (Republic of Abkhazia)

Литосфера, 2020
Subject. The aim of the work is to study the mechanism and sources of water formation, as well as the peculiarities of carbonate mineralization in the aquifer of the Kyndyg thermal water deposit. Materials and methods.
S. S. Potapov, D. V. Kiseleva, O. Ya. Chervyatsova, N. V. Parshina, M. V. Chervyakovskaya, S. V. Karpova, N. V. Cherednichenko, R. S. Dbar   +7 more
doaj   +1 more source

Frictional properties and microstructure of calcite-rich fault gouges sheared at sub-seismic sliding velocities

, 2014
We report an experimental and microstructural study of the frictional properties of simulated fault gouges prepared from natural limestone (96 % CaCO3) and pure calcite.
Structural geology and EM, Spiers, C.J., ISES: New frontiers in focused Ion beam, de Bresser, J.H.P., de Winter, D.A.M., Sub Biomolecular Imaging, ISES: Frictional behaviour of calcite-rich fault rocks & implications for seismicity in carbonate terrains, Niemeijer, A.R., Verberne, B.A., Plümper, O., Experimental rock deformation   +10 more
core   +1 more source

Enhancement of the Plant‐Accessible Phosphate Fraction in Sewage Sludge Ashes by Na+ or K+ Addition Prior to Combustion

ChemSusChem, Volume 18, Issue 6, March 15, 2025.
The addition of Na2CO3 or K2CO3 to sewage sludge prior to combustion leads to the production of ashes containing phosphate in the form of buchwaldite‐like phases (Ca(Na/K)PO4). Compared to conventional sewage sludge mono‐ashes, such Na‐ or K‐ashes show greatly increased P‐solubilities and proved to be potent P‐fertiliser materials in greenhouse ...
Lorenz Bier‐Schorr, Viktoria Gräser, Michael Scherer‐Lorenzen, Peter Hajek, Philipp Kurz   +4 more
wiley   +1 more source

Pengaruh Ion Karbonat dalam Proses Presipitasi Senyawa Kalsium Fosfat [PDF]

Makara Seri Sains, 2002
An experiment has been conducted to fi nd out the effect of ion carbonate in the calcium phosphate precipitation process. It was conducted by adding CaCl2.2H2O 8 mM into Na2HPO4.2H2O 8 mM and NaHCO3.
Siti Ahmiatri, Djarwani S. Soejoko
doaj  

Crystallography of calcite in pearls

, 2014
Mineralization in pearls is used as a 'study model' to understand basic mechanisms of calcium carbonate biomineralization. In addition to nacre formation, vaterite and calcite can be found in pearls, with the occurrence of calcite being the least studied.
Dauphin, Yannicke, Pérez-Huerta, A., Cuif, J.P., Cusack, M., Dauphin, Y., Cuif, J.-P.   +5 more
core   +1 more source

Slip versus dilation tendency parameter space as a tool for prospecting structurally controlled geothermal systems in greenfield: insights from the greater Ruhr region

Deep Underground Science and Engineering, EarlyView.
This study highlights that with the static and time‐dependent evolution of slip versus dilation tendency parameter space, structurally controlled deep geothermal systems can be selected within areas of higher permeability and lower seismic hazard. Abstract Faults play a vital role in the Earth's hydraulic system by facilitating fluid flow when dilating
Michal Kruszewski, Alessandro Verdecchia, Oliver Heidbach, Rebecca M. Harrington, David Healy   +4 more
wiley   +1 more source

Surface hydration‐induced damage in tight oil‐bearing sandy conglomerate reservoirs

Deep Underground Science and Engineering, EarlyView.
A series of techniques such as X‐ray diffraction, scanning electron microscopy, energy‐dispersive spectroscopy, conductivity tests, and infrared thermal imaging were used. The key findings are the identification of a two‐stage surface hydration process and the elucidation of the effects of various minerals and elements on the hydration process ...
Anbang Zhao, Shuheng Du, Yuan Zhang, Jinghong Hu, Bo Zhou, Yun Wei   +5 more
wiley   +1 more source

Opium trade and use during the Late Bronze Age: Organic residue analysis of ceramic vessels from the burials of Tel Yehud, Israel

Archaeometry, EarlyView., 2022
Abstract Organic residue analysis was conducted on various vessels from burials at Tel Yehud, Israel. The analyses led to new reliable evidence for the presence of opioid alkaloids and their decomposition products. This research revitalizes a decades‐old discussion on the presence and function of the opium trade across a cultural region of utmost ...
Vanessa Linares, Eriola Jakoel, Ron Be’eri, Oded Lipschits, Ronny Neumann, Yuval Gadot   +5 more
wiley   +1 more source