It has been widely accepted that there is a close relationship between the land use type and water quality. There have been some researches on this relationship from the perspective of the spatial configuration of land use in recent years. This study aims to analyze the influence of various land use types on the water quality within the Chaohu Lake Basin based on the water quality monitoring. View Math Assignment 17-7.pdf from MATH STAT 4508 at Carleton University. Find Faith Lessons Vol. 1 - 7 That the World May Know - Ray Vander Laan - 7 Dvds at Amazon.com Movies & TV, home of thousands of titles on DVD and Blu-ray.

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Abstract

The surface species produced on Si(1 1 1)7 7 and vitreous SiO2 surfaces by ion irradiation in CF4 and in CH2F2 at 50 eV impact energy have been investigated by electron energy loss spectroscopy (EELS), thermal desorption spec-trometry (TDS) and low energy electron diffraction (LEED). In particular, the reaction layer for Si(1 1 1)7 7 ion-irradiated in CF4 is characterized by the presence of Si–C stretching, Si–Fx (x 1–3) stretching and bending modes, while ion irradiation in CH2F2 introduces additional C–H stretching mode. For both cases, the absence of C–F stretching feature in the corresponding EELS spectra indicates that CFx (x 1–3) surface species do not present in any appreciable amount. These EELS results are consistent with the TDS data, which shows that SiF4 is the major de-sorption product and desorption products such as CFx (x 1–3) are not observed. Ion irradiation of Si(1 1 1)7 7 in CF4 or CH2F2 at low impact energy therefore produces SiC and SiFx (x 1–3) as the primary surface products, while additional CH species is found in the latter case of ion-irradiation in CH2F2. When the oxidized surface instead of the 7 7 surface of Si(1 1 1) is used as the substrate, ion irradiation by the same dose of fluorocarbon ions appears to enhance the deposition of SiFx but reduce the amount of SiC species, which provides evidence for recombination re-action of surface O with surface C to form gaseous CO or CO2, leaving behind more F to interact with the Si substrate atoms. The corresponding TDS data suggests that the OCF radical may also be one of the minor desorption products.

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