نتایج جستجو برای: alteration mineral mapping
تعداد نتایج: 307775 فیلتر نتایج به سال:
Objectives To assess tooth crown's color after intracanal treatment with triple antibiotic paste (TAP) or calcium hydroxide (CH); cervical sealing with glass ionomer cement (GIC) or mineral trioxide aggregate (MTA); and bleaching with carbamide peroxide. Material and Methods After pulp removal and color spectrophotometer measurement, 50 bovine incisors were divided into 4 experimental groups ...
Abstract. The integration of surface and subsurface geoscience data is critical for efficient effective mineral exploration mining. Publicly accessible sets to evaluate the various analytical tools their effectiveness characterisation assemblages lithologies or discrimination ore from waste are however scarce. open-access Rocklea Dome 3D Mineral Mapping Test Data Set (Laukamp, 2020; https://doi...
Electrocorticographic frequency alteration mapping for extraoperative localization of speech cortex.
OBJECTIVE Electrocortical stimulation (ECS) has long been established for delineating eloquent cortex in extraoperative mapping. However, ECS is still coarse and inefficient in delineating regions of functional cortex and can be hampered by afterdischarges. Given these constraints, an adjunct approach to defining motor cortex is the use of electrocorticographic (ECoG) signal changes associated ...
Abstract Early evolution of Solar System small bodies proceeded through interactions mineral and water. Melting water ice accreted with particles to the parent body results in formation secondary minerals, so-called aqueous alteration. Formation phyllosilicates from anhydrous silicates is a typical alteration effect recorded primitive meteorites. In addition water, organic matter could have bee...
Exact petrography and mineral chemistry investigations of pristine and altered rocks of the post-Eocene Panj-Kuh pluton show thatsubsequent to emplacement and crystallization, rocks were subjected to two secondary composition equivalents, sodic-calcic andpotassic alterations, respectively. Fresh rocks have syenitic composition and contain plagioclase (labradorite), K-feldspar, magmaticdiopside,...
Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) covers a wide spectral region with 14 bands from visible to the thermal infrared. The different band ranges can be capable of discriminating and mapping surface rocks and predicting pathfinder minerals (i.e. alunite, kaolinite etc.) on alteration assemblages of potential targets. The aim of this study is to compare two diffe...
The purpose of this study was to demonstrate the value of the proposed Hyperspectral Infrared Imager (HyspIRI) instrument for geological mapping applications. HyspIRI-like data were collected as part of the HyspIRI airborne campaign that covered large regions of California, USA, over multiple seasons. This work focused on a Southern California area, which encompasses Imperial Valley, the Salton...
Introduction: Most components of CV chondrites show variable degrees of late-stage alteration resulting in the modification of preexisting mineral assemblages and/or in the formation of new minerals. The conditions and environment under which these processes occurred are highly debated, with arguments in favor of solar nebular as well as asteroidal settings [1]. In the particular case of calciu...
Gases contained within near-surface marine sediments can be derived from multiple sources: shallow microbial activity, thermal cracking of organic matter and inorganic materials, or magmatic-mantle degassing. Each origin will display a distinctive hydrocarbon and non-hydrocarbon composition as well as compound-specific isotope signature and thus the interpretation of origin should be relatively...
In GIS-based data-driven modeling of mineral prospectivity, a suitably fine unit cell size is used for spatial representation of known occurrences of mineral deposits of the type sought (D) in a study area (T). However, until now, the unit cell size is chosen subjectively. In this paper, a methodology is proposed for objective selection of the most suitable unit cell size for data-driven modeli...
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