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Showing 1 to 20 of 525 for “"Weathering"”.
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Factors Influencing Biotite Weathering
Weathering of biotite supplies nutrients such as K+ and weathers into vermiculite/montmorillonite or kaolinite, which have varying influences on soil properties and characteristics. This study was conducted to determine if the weathering mechanisms of biotite are controlled by temperature, or if …
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Adsorption–Desorption Reactions in the Weathering Zone: Implications for Silicate Weathering & the Carbon Cycle
The carbonic acid-driven chemical weathering of silicate minerals removes carbon dioxide (CO2) from Earth's atmosphere. The tectonic processes of uplift, exhumation, and erosion modulate the negative feedback relationship between climate, silicate weathering rates, and atmospheric CO2 removal rates …
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Mineralogy of Sangamon Weathering Profiles
Made available in DSpace on 2014-12-04T19:13:40Z (GMT). No. of bitstreams: 1 5805395.pdf: 1939868 bytes, checksum: e4ca754b83d6015d1ebc856ee40f6fed (MD5) Previous issue date: 1958
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Geochemical Investigations of Mineral Weathering: Quantifying Weathering Intensity, Silicate versus Carbonate Contributions, and Soil-Plant Interactions
… study is the geochemical examination of mineral weathering and its path from hinterland, through sediment deposition and pedogenesis, to its dissolution and eventual uptake into plants or precipitation as carbonate minerals. The three papers examine the rate and character of carbonate and …
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Trojan asteroid spectroscopy and space weathering
… confirm our original hypothesis. Instead, space weathering appears to affect Trojans in a different way than it does other asteroid classes due to their different composition.
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Media Narratives and the Weathering of Climate
The International Panel on Climate Change (IPCC) published five assessments since 1990 warning of the impact of human activity on rapid climate change. The assessments affirm that climate change will increase the frequency and severity of extreme weather events. While there is a scientifically …
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Chemical weathering of sulfide mineralization on Mars
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1990.
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Factors influencing salt-induced weathering of building sandstone.
… of chemical cleaning in causing salt-induced weathering of building sandstone was investigated by looking at the changes in a series of weathering indicators selected. These were mainly, porosity and pore size distribution changes, chemical composition and colour changes. Laboratory studies …
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Effects of space weathering on the Trojan asteroids
… large error bars and the small data set. Space weathering may affect Trojans in the same way as it does other asteroid classes. To know with certainty, further investigation is needed.
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Weathering of wood surfaces: characteristics, mechanisms, and prevention
Photodegradation of southern yellow pine, its mechanisms and means of prevention were studied. Changes in brightness and color were recognized when wood was exposed outdoors or to ultraviolet light. Scanning electron micrographs showed that most of the cell walls on irradiated transverse surface …
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The geochemistry of late Precambrian weathering profile northwest Scotland
… to understand the environment of the Precambrian weathering at Rispond, and compare it with weathering processes taking place at the present time, samples weathered to different degrees have been taken at various distances immediately below the Cambrian Unconformity. These samples have been …
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Environmental Influences on Tree-driven Karst Bedrock Physical Weathering
… roots as stressors that contribute to physical weathering processes and thus soil generation remains an open question in critical zone science. While evidence suggests roots may be able to damage rock by accessing pre-existing fractures, where they can expand due to water uptake or generate …
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Weathering the Storm: Hurricane Resiliency in the Florida Keys
How can architects let their buildings interact with the water while protecting occupants from the potential danger? The two intents are very different and often compete with one, either protection or recreation, as the primary program in one project. Water draws people, everyone likes being near …
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Forsterite Dissolution Kinetics: Applications and Implications for Chemical Weathering
… earth's crust so it is not surprising that their weathering reactions dominate the chemistry of many earth surface processes. This project used forsterite as a model system to identify the important factors that affect silicate mineral dissolution rates and grain lifetimes in the weathering …
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Weathering below Irish blanket bogs and impacts on carbon dynamics
… investigates CO2 consumption by chemical weathering related to mineral soils and bedrock underlying peatland catchments in Ireland via measurement of major ion fluxes and runoff. Influence of peatland condition and substrate composition is investigated by comparison of catchments with …
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Reflectance and Related Studies of The Weathering of Surface Coatings
… of reflectance changes brought about by weathering - a usage which appears not to have been previously exploited to any notable extent. In conjunction with goniophotometry, a variety of other techniques are also used, notably scanning electron microscopy, multiple internal reflection …
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Behavior of trace elements in rock weathering and soil formation
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Geology and Geophysics, 1958.
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Composition and engineering properties of some vermiculitic products of weathering
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Geology and Geophysics, 1961.
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