Results 61 to 70 of about 868 (182)

A Peridynamic Framework for Modeling Progressive Failure in Porous Sandstone Indentation

International Journal for Numerical and Analytical Methods in Geomechanics, Volume 50, Issue 6, Page 2727-2743, 25 April 2026.
ABSTRACT A state‐based peridynamic model is proposed to simulate the failure mechanisms in porous rocks, using Bentheim sandstone as a specific example. Experimental observations reveal a transition from brittle to ductile failure under increasing triaxial compression. This behavior is attributed to pore compaction. The peridynamic model is enhanced to
Sahir N. Butt, Jörg Renner, Günther Meschke   +2 more
wiley   +1 more source

The effect of different fluxing agents on the sintering of dry pressed porcelain bodies

Journal of Asian Ceramic Societies, 2017
The aim of the article is to find the optimal fluxing agent for porcelain body regarding to the possibility of the lowest firing temperature. Sintering behaviour of dry pressed test samples made from the mixture of kaolin and three different types of ...
Radomír Sokolář, Lucie Keršnerová, Mikuláš Šveda   +2 more
doaj   +1 more source

Rietveld structure refinement of microcline

European Journal of Mineralogy, 2015
Compared with single-crystal X-ray diffraction, extracting structural data from X-ray powder diffraction (XRPD) seems meaningless for minerals with an available single crystal, such as alkali feldspar. However, alkali feldspar is highly abundant on Earth, and the feldspar structure is important in geology.
openaire   +1 more source

Preparation and Characterization of Microfiltration Ceramic Membranes Based on Natural Quartz Sand

Chemistry Journal of Moldova: General, Industrial and Ecological Chemistry, 2017
The effect of phase and chemical composition of natural quartz sand, binder and burnable additives was studied. The conditions of application of the membrane and biocide layers on the formation of porous ceramic and microfiltration membranes were ...
Andrei Ivanets, Vladimir Agabekov
doaj   +1 more source

Measurement report: Ice nucleation ability of perthite feldspar powder [PDF]

Atmospheric Chemistry and Physics
Feldspars are among the most efficient mineral ice-nucleating particles (INPs) in the atmosphere, yet their ice nucleation behavior varies widely across natural samples.
J. Canet, J. Canet, L. Rodríguez, G. Renzer, P. Alfonso, M. Bonn, K. Meister, K. Meister, M. Garcia-Valles, A. Verdaguer   +9 more
doaj   +1 more source

Characterization of Red Sandstone and Black Crust to Analyze Air Pollution Impacts on a Cultural Heritage Building: Red Fort, Delhi, India

Heritage
Urban air pollution poses significant risks to cultural heritage buildings, particularly in polluted megacities like Delhi, India. The Red Fort, a UNESCO World Heritage Site and a symbol of India’s rich history, is highly susceptible to degradation ...
Gaurav Kumar, Lucia Rusin, Pavan Kumar Nagar, Sanjay Kumar Manjul, Michele Back, Alvise Benedetti, Bhola Ram Gurjar, Chandra Shekhar Prasad Ojha, Mukesh Sharma, Eleonora Balliana   +9 more
doaj   +1 more source

DISTRIBUIÇÃO DE METAIS PESADOS NOS SEDIMENTOS DE FUNDO DOS RIOS CACERIBU E GUAXINDIBA, AFLUENTES DA BAÍA DE GUANABARA – RIO DE JANEIRO, BRASIL [PDF]

Geochimica Brasiliensis, 2015
The Caceribu e Guaxindiba Rivers are two important tributaries of Guanabara Bay – RJ. Both are included in two protection environmental area and they are passive from sources and intense differences.
Liliane Jucá Lemos da Silva Porto, Cícera Neysi de Almeida, Márcia Walquiria de Carvalho Dezotti, José Augusto Martins Corrêa, Kelson do Carmo Freitas Faial, Kleber Raimundo Freitas Faial   +5 more
doaj  

Mineral and structural features of jewelery wood tin

Известия высших учебных заведений: Геология и разведка, 2017
A mineral composition and gemological descriptions of the jewelery varieties of the wood tin of deposits Dzhalindinskoe (Khabarovskiy krai), Tynooken (East Chukotka) and Dominion Krik (Canada) have been explored.
D. A. Petrochenkov
doaj   +1 more source

On the crystallization conditions of the Neoproterozoic, high-K calc-alkaline, Bragança Paulista-type magmatism, southern Brasília Orogen, SE Brazil

Brazilian Journal of Geology
: Syn-orogenic Neoproterozoic granitic magmatism (ca. 630-600 Ma) in southern Brasília Orogen includes large batholiths of compositionally expanded high-K calc-alkaline granites (lato sensu) and small occurrences constituted by anatetic leuco-granites ...
Andrés Fabián Salazar-Naranjo, Silvio Roberto Farias Vlach   +1 more
doaj   +1 more source

Geology of Langhovde, Lutzow-Holm Bay, East Antarctica

Antarctic Record, 1974
The rocks exposed in Langhovde, Liitzow-Holm Bay, East Antarctica, are chiefly metamorphic and granitic, with less extensive glacial deposits and beach sediments. Metamorphic rocks consist of metabasite, pyroxene gneiss, hornblende gneiss, garnet-biotite
Terumi ISHIKAWA
doaj   +1 more source