Determining the fracture toughness of rock materials is a challenging, costly, and time-consuming task, as fabricating sharp crack in specimens will lead to failure specimen, preparing for determining requires special equipment. In this paper, relationship between mode I (KIC) with index properties, mineralogy, petrography limestone investigated using simple nonlinear simple/multiple linear reg...

Processes controlling preservation and accumulation of organic matter (OM) in marine sediments are highly sensitive towards both natural anthropogenic impacts. Thus, the sedimentary OM is considered a key proxy for characterization recent past environments . Along Peruvian continental margin (PCM), high primary production an intense oxygen minimum zone (OMZ) favor sediments. Spatial variations ...

Petrography and physicomechanical properties of alkali granites, alkali quartz syenite, and nepheline syenite from Ambela, NW Pakistan, have been investigated. Whereas the alkali quartz syenite and most of the alkali granites are megaporphyritic, the nepheline syenite and some of the alkali granites are microporphyritic. Their phenocryst shape and size and abundance of groundmass are also diffe...

The occurrence of rhythmic layering of chromite and host serpentinites in the deformed layered igneous complexes has been noticed in the Nuggihalli schist belt (NSB) in the western Dharwar craton, Karnataka, South India. For this study, the chromitite rock samples were collected from Jambur, Tagadur, Bhakatarhalli, Ranganbetta and Byrapur in the NSB. Petrography and ore microscopic studies on c...

When the size of an ontology increases, it becomes hard to be managed. Ontology view extraction is an approach that can be used for overcoming the challenges that arise in this scenario. In this context, an ontology view is a subset of an ontology tailored to a specific set of user requirements. Well-founded ontology views were recently proposed as ontology views that follow well-founded ontolo...

This paper deals with the study of a highly durable polyester polymer concrete reinforced with glass fibre reinforced polymer rebars. The paper describes the properties of this specific concrete, which were tested using different experimental techniques such as porosimetry, scanning electron microscopy and petrography. Likewise, characterisation in a macro-scale was carried out to define the me...

Are porewater flow or stasis exclusive hypotheses? We think there is an intermediate view. Processes governing sandstone cementation in the deep sub-surface are elusive, case-specific and difficult to model in general terms. Combining techniques from petrography, isotopic and ion microprobe analyses with basin modelling one can narrow the possibilities towards unique hypotheses. Examples are gi...

Ice streams drain large portions of ice sheets and play a fundamental role in governing their response to atmospheric and oceanic forcing, with implications for sea-level change. The mechanisms that generate ice stream flow remain elusive. Basal sliding and/or bed deformation have been hypothesized, but ice stream beds are largely inaccessible. Here we present a comprehensive, multi-scale study...