15 research outputs found

    Using electrical arc discharge method to prepare Ag-TiO2 nanoparticles and study its photocatalytic activity

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    A simple, inexpensive and one-step synthesis route of Ag-TiO2 nanoparticles by arc discharge method has been reported. The resulting nanoparticles were characterized by using X-ray diffraction and scanning electron microscopy. X-ray diffraction patterns demonstrate dominance of rutile to anatase phase in TiO2 and formation of silver metal onTiO2 after arc discharge process. Scanning electron microscopy images exhibit the increase of reduced nanoparticles in 5 min arc duration as compared with 1 min arc duration. Photodegradation of methyl orange as a standard pollutant shows that the presence of silver in TiO2 was found to enhance the photocatalytic activity. The high activity of silver doped TiO2 is due to the enhancement of electron-hole separation by the electron trapping of silver particles

    <span style="font-size:10.0pt;font-family: "Times New Roman";mso-fareast-font-family:"Times New Roman";mso-bidi-font-family: Mangal;mso-ansi-language:EN-US;mso-fareast-language:EN-US;mso-bidi-language: HI" lang="EN-US">Using electrical arc discharge method to prepare Ag-TiO<sub>2</sub> nanoparticles and study its photocatalytic activity</span>

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    311-315A simple, inexpensive and one-step synthesis route of Ag-TiO2 nanoparticles by arc discharge method has been reported. The resulting nanoparticles were characterized by using X-ray diffraction and scanning electron microscopy. X-ray diffraction patterns demonstrate dominance of rutile to anatase phase in TiO2 and formation of silver metal onTiO2 after arc discharge process. Scanning electron microscopy images exhibit the increase of reduced nanoparticles in 5 min arc duration as compared with 1 min arc duration. Photodegradation of methyl orange as a standard pollutant shows that the presence of silver in TiO2 was found to enhance the photocatalytic activity. The high activity of silver doped TiO2 is due to the enhancement of electron-hole separation by the electron trapping of silver particles

    A Model for Locating Tall Buildings through a Visual Analysis Approach

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    Tall buildings have become an integral part of cities despite all their pros and cons. Some current tall buildings have several problems because of their unsuitable location; the problems include increasing density, imposing traffic on urban thoroughfares, blocking view corridors, etc. Some of these buildings have destroyed desirable views of the city. In this research, different criteria have been chosen, such as environment, access, social-economic, land-use, and physical context. These criteria and sub-criteria are prioritized and weighted by the analytic network process (ANP) based on experts’ opinions, using Super Decisions V2.8 software. On the other hand, layers corresponding to sub-criteria were made in ArcGIS 10.3 simultaneously, then via a weighted overlay (map algebra), a locating plan was created. In the next step seven hypothetical tall buildings (20 stories), in the best part of the locating plan, were considered to evaluate how much of theses hypothetical buildings would be visible (fuzzy visibility) from the street and open spaces throughout the city. These processes have been modeled by MATLAB software, and the final fuzzy visibility plan was created by ArcGIS. Fuzzy visibility results can help city managers and planners to choose which location is suitable for a tall building and how much visibility may be appropriate. The proposed model can locate tall buildings based on technical and visual criteria in the future development of the city and it can be widely used in any city as long as the criteria and weights are localized
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