Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 9 of 9 for “"artificial weathering"”.
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Surface coating deterioration studies
… deterioration of surface coatings as a result of weathering and exposure to a pollutant gas (in this case nitric oxide). Poly(vinyl chloride) (PVC) plastisol surface coatings have been exposed to natural and artificial weathering and a comparison of the effects of these two types of weathering has …
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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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Alteration of dioctahedral micas in soils
Artificial and natural weathering studies were conducted on four dioctahedral micas found in soil parent material of the Virginia Piedmont. Emphasis was given to the relationship between loss of K (also Na in certain cases), increase in CEC, and expansion characteristics. Boiling treatments with …
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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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Light and Heat Selective Polymer Nanocomposite Films for Sustainable Greenhouses
… experimental films were aged in an accelerated artificial weathering chamber to examine the effects of prolonged exposure to sunlight, heat and moisture. The new and aged films were characterized in terms of their optical, thermal, and material properties and the results were compared to …
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Performance Assessment and Evaluation of Hydrophobic and Ultraviolet Protective Treatments for Historic Log Structures
… of criteria including performance in accelerated weathering, ecological sustainability, and impact on aesthetic and heritage character. Like many log structures in the American West, Grand Teton National Park’s historic structures are exposed to a large amount of UV radiation. In addition to …
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Appearance and Spectroscopic Characterization of Automotive Coatings for Forensic Purposes
… of automotive coatings over time, controlled artificial weathering of clear coats from two major manufacturers was performed at 55°C and 75% relative humidity (RH) with 100% ultraviolet (UV) radiation using the SPHERE (Simulated Photodegradation via High Energy Radiant Exposure) at the …
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Evaluating Methods of Screening for Pre-Harvest Sprouting in Soft Red Winter Wheat and the Effect of Delayed Harvest on Flour Properties
… significant pre-harvest sprouting (PHS) and weathering throughout the mid-Atlantic soft red winter wheat (SRWW) (Triticum aestivum L.) growing region. Sprouting and weathering caused decreased flour quality due to lowered dough viscosity and decreased ability to withstand mixing and …
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Degradation studies on recycled Polyethylene terephthalate
… of UV on the properties under natural and artificial weathering. The real-time outdoor weathering exposures provide the most accurate results but, they are very slow and manufacturers cannot afford to wait in order to see if a new or improved product formulation is really an improvement. …