نتایج جستجو برای: thermal alteration
تعداد نتایج: 261899 فیلتر نتایج به سال:
In this study, we demonstrate the strong potential of combining Unmanned Aerial Vehicle (UAV)-based thermal infrared (IR) and magnetic measurements to image state volcanic edifices, as well distribution active volcano-tectonic features at depth. Since magnetization is strongly dependent on temperature alteration, thermally structures are also associated with a decrease in magnetization. Based a...
Sensitivity in BOLD fMRI is characterized by the signal to noise ratio (SNR) of the time-series (tSNR), which contains fluctuations from thermal and physiological noise sources. Alteration of an acquisition parameter can affect the tSNR differently depending on the relative magnitude of the physiological and thermal noise, therefore knowledge of this ratio is essential for optimizing fMRI acqui...
The oxygen isotope composition of fossil fish teeth, a paleoupper ocean temperature proxy exceptionally resistant to diagenetic alteration, provides new insight on the evolution of the lowto middlelatitude thermal gradient between the middle Cretaceous climatic optimum and the cooler latest Cretaceous period. The new middle Cretaceous low to middle latitude thermal gradient agrees with that pre...
The aim of this study is to carry out hydrothermal alteration mapping and structural using ASTER images in order identify indices that could guide mining exploration work the Poli area its surroundings. To achieve this, were first preprocessed correct atmospheric effects remove vegetation influence. Secondly, a lineament was conducted by applying Discrete Wavelet Transform (DWT) algorithms Firs...
This paper presents a formalism, LADA, aimed especially at the description of systems and situations which arise during the design and analysis of groupware. We are particularly interested in highly distributed systems and so LADA explicitly models entities (people and things) acting at different unconnected locations. It not only describes the behaviour of the computer software, but also the s...
Introduction: A variety of spectroscopic techniques have revealed that variations in functional group chemistry of insoluble organic matter (IOM) among the groups and sub-types of chondrites sensitively respond to secondary processes, including aqueous alteration [1] and thermal metamorphism [2]. However, such variations are minimal within the same meteorite group [3], unlike mineralogical stud...
chlorite flakes, as a product of alteration of biotite, the dominant ferromagnesian mineral in the paleozoic granitic rocks of the canadian appalachians, have been analyzed by electron microprobe for major elements and by 57fe m?ssbauer spectroscopy for the coordination and oxidation state of fe. comparison of m?ssbauer fe3+/fe ratios obtained from chlorite and its host biotite indicates that c...
The volcanic rocks of Silurian in Khosh yeylagh are located in eastern Alborz structural zone, east of Golestan Province. This volcanic mass is significantly affected by hydrothermal alteration. Propylitic alteration is the most dominant alteration in this area. Based on field observation and X-Ray diffraction studies, four alteration zones of chlorite, epidote, albite and hematite are recogni...
Severe burn injury can result in dramatic changes in human physiology and biochemistry. Aberrant responses, hypersensitivity and potentially lethal hyperkalemia to depolarising [1,2] and hyposensitivity to non-depolarising [2,3] muscle relaxants have been noted in burn trauma. The molecular basis of these responses is currently thought to be due to an increase in nicotinic acetylcholine recepto...
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