Results 71 to 80 of about 15,532 (257)

Alteration of granite stone used in building construction

Materiales de Construccion, 2007
The article contains a synthesis of the different factors involved in the alteration of granite ashlars or cladding used in building construction. Emphasis is placed on the – primarily fissure-like – anisotropies often present in granite, which are ...
R. M.ª Esbert Alemany
doaj   +1 more source

Sinningia pampeana sp. nov. (Gesneriaceae) from the Pampa's rocky outcrops in southern Brazil and Uruguay

Nordic Journal of Botany, EarlyView.
Sinningia pampeana is a new rupicolous species from the rocky outcrops of the Pampa biome in southern Brazil and Uruguay. Morphological analyses based on herbarium material, field observations, and detailed illustrations support its recognition as a distinct species from Sinningia sellovii.
Gabriel Emiliano Ferreira, Daniel Alves Spiazzi, Pedro Henrique Sonsim Barbieri, Alain Chautems, Andréa Onofre Araújo   +4 more
wiley   +1 more source

Strength Parameters and Failure Criterion of Granite After High-Temperature and Water-Cooling Treatment

Applied Sciences
Granite is the main rock type in hot dry rock reservoirs, and hydraulic fracturing is always required during the process of geothermal production.
Jincai Yu, Cheng Cheng, Yuan Xie, Peng Chen   +3 more
doaj   +1 more source

Eriope barrinhae (Lamiaceae, Hyptidinae), a new montane species from northern Minas Gerais, Brazil

Nordic Journal of Botany, EarlyView.
In northern Minas Gerais, in the Monte Azul region, the Pico da Formosa mountain remains poorly explored botanically despite recent discoveries of new taxa. During fieldwork at the summit of this mountain, we discovered a distinctive population of Eriope that differs from all known species by a unique combination of morphological characters.
Danilo Alvarenga Zavatin, Luísa Azevedo, Renato Ramos, Jefferson Prado, Arthur de Souza Soares   +4 more
wiley   +1 more source

Experimental Investigation of Moisture Movement During Freeze–Thaw Cycles and Its Effect on Physical Rock Weathering in Low‐Porosity Alpine Limestone

Permafrost and Periglacial Processes, EarlyView.
ABSTRACT The progressive weakening of alpine rockwalls through subcritical cracking, driven by repeated low‐magnitude stress processes, plays a key role in alpine rock weathering. Laboratory studies using acoustic emission (AE) monitoring have shown that thermal stresses from freeze–thaw cycling induce crack propagation, with recent work highlighting ...
Andrew Mitchell, Oliver Sass
wiley   +1 more source

Spatial Variability of Permafrost and Active Layer Thickness in a Forested Hillslope of the Taiga Shield

Permafrost and Periglacial Processes, EarlyView.
ABSTRACT Under continued climate warming, understanding present‐day permafrost distribution and the controls on ground thaw are critical for predicting permafrost thaw trajectories and associated implications. This study presents a high‐resolution investigation of permafrost extent and active layer thickness (ALT) across a coniferous forested hillslope
Alana Muenchrath, Christopher Spence, Andrew Ireson   +2 more
wiley   +1 more source

The regulation of mechanical properties and freeze-thaw properties of concrete hollow block with granite waste

Journal of Asian Architecture and Building Engineering
Owing to the generation of waste during mining and processing, granite stone causes great damage to the environment. In this study, the broken granite waste and the stone powder were used as concrete coarse aggregate and “admixture” to make granite waste
Gengqi Zhao, Xiaogang Gao, Xiaohang Zhang, Xiaoxing Huang   +3 more
doaj   +1 more source

Scale and Rock Type Dependency of Mórágy Granite Formation in the Aspect of Fracture Density

Geotechnics
The geometry of rock mass fractures is typically characterized through geological and geotechnical investigations. Detailed descriptions of granitic host rock can yield valuable data for constructing fracture network models.
Gábor Somodi, Balázs Vásárhelyi
doaj   +1 more source

From Flybys to Sample Return: A Review of Space Probes and Robotic Sampling Technologies for Small Bodies

Journal of Field Robotics, EarlyView.
ABSTRACT As a crucial puzzle piece of deep space exploration, exploring small bodies can provide significant scientific insights and valuable mineral resources. Unlike missions to the Moon and Mars, small‐body missions pose distinct technical challenges, including communication delays, weak gravity, and uncertain environments. This paper reviews a full
Xin Zhang, Hao Zhou, Dalin Zhou, Zhaojie Ju   +3 more
wiley   +1 more source

Thermal Damage Characterization and Modeling in Granite Samples Subjected to Heat Treatment by Leveraging Machine Learning and Experimental Data

Applied Sciences
High temperatures significantly affect the physical and mechanical properties of rocks in deep geoengineering projects, such as geothermal development, deep mining, and the geological disposal of nuclear waste.
Gabit Sansyzbekov, Amoussou Coffi Adoko, Paul Mathews George   +2 more
doaj   +1 more source