Investigation on manufacturing process in some elamite copper alloy artefacts from haft tappeh, south-west Iran

, Article Microscopy and Microanalysis ; Vol. 20, issue. 3 , August , 2014 , pp. 2034-2035 ; ISSN: 14319276 Oudbashi, O ; Davami, P ; Sharif University of Technology

2014

Abstract

[No abstract available]

Metallography and microstructure interpretation of some archaeological tin bronze vessels from Iran

, Article Materials Characterization ; Vol. 97 , November , 2014 , pp. 74-82 Oudbashi, O ; Davami, P ; Sharif University of Technology

2014

Abstract

Archaeological excavations in western Iran have recently revealed a significant Luristan Bronzes collection from Sangtarashan archaeological site. The site and its bronze collection are dated to Iron Age II/III of western Iran (10th-7th century BC) according to archaeological research. Alloy composition, microstructure and manufacturing technique of some sheet metal vessels are determined to reveal metallurgical processes in western Iran in the first millennium BC. Experimental analyses were carried out using Scanning Electron Microscopy-Energy Dispersive X-ray Spectroscopy and Optical Microscopy/Metallography methods. The results allowed reconstructing the manufacturing process of bronze...

Day of The Week Effect on Tehran Stock Exchange

, M.Sc. Thesis Sharif University of Technology Oudbashi, Sama (Author) ; Zamani, Shiva (Supervisor)

Abstract

The present study investigated day of the week effect on stock market returns and the stock market returns and volatility relationship in Tehran Stock Exchange. In this part two regression models is been used and theory that effect of days are meaningful on return and also the theory of meaningfulness and being equal of relation between return and volatility in different days of the week has been examined on index return of all market and on industry indexes in separately. Therefore we have utilized information from time series of total index week days categorized into 8 industries during 2008-2013. The results obtained on weekdays effect on the index of the first model and second model...

Investigation on corrosion stratigraphy and morphology in some iron age bronze alloys vessels by OM, XRD and SEM–EDS methods

, Article Applied Physics A: Materials Science and Processing ; Volume 122, Issue 4 , 2016 ; 09478396 (ISSN) Oudbashi, O ; Hasanpour, A ; Davami, P ; Sharif University of Technology

2016

Abstract

The recently study of the corrosion in some bronze artefacts from the Sangtarashan Iron Age site, western Iran, was established to identify corrosion morphology and mechanism in these objects. The corrosion layers in 22 samples were studied by optical microscopy, scanning electron microscopy–energy-dispersive X-ray spectroscopy and X-ray diffraction methods. The results showed that a thin corrosion crust has formed on the surface of bronzes with a triple-layer structure, including two internal and one external corrosion layers. The formation of these layers is due to copper leaching from the bronze surface. The internal corrosion part has been a compact, tin-rich corrosion/oxidation product...

Micro-stratigraphical investigation on corrosion layers in ancient Bronze artefacts by scanning electron microscopy energy dispersive spectrometry and optical microscopy

, Article Heritage Science ; Volume 1, Issue 1 , 2013 ; 20507445 (ISSN) Oudbashi, O ; Emami, S. M ; Ahmadi, H ; Davami, P ; Sharif University of Technology

2013

Abstract

Background: Archaeological metallic artefacts buried in soils deteriorate by means of various environmental as well as internal factors and mechanisms over time such as change in composition and microstructure of metal and corrosive factors due to long-term burial environment. Corrosion in metals occurs in different morphologies and results in different types of corrosion products based on soil composition. Identification of corrosion mechanisms and morphology in archaeological metals can help conservators to characterize deterioration occurred in metals and make decisions to protect artefacts about preventing further deterioration. In archaeological bronzes, different layers may form on the...

Archaeometallurgical studies on the bronze vessels from "sangtarashan", Luristan, W-Iran

, Article Iranica Antiqua ; Volume 48 , 2013 , Pages 147-174 ; 00210870 (ISSN) Oudbashi, O ; Emami, S. M ; Malekzadeh, M ; Hassanpour, A ; Davami, P ; Sharif University of Technology

2013

Abstract

In this paper, an analysis is presented of some bronze vessels from recent excavations at the first millennium BC site of Sangtarashan in eastern Luristan, Iran, according to metallography (OM), ICP-OES and SEM-EDS methods to identify alloying as well as manufacturing processes. This study provides new evidence for a better understanding of the bronze archaeometallurgy during the Iron Age in Iran. It concludes that the artifacts contain homogenous and single phase tin bronze (Cu-Sn) alloy. The Sn content in the artifacts also allowed to apply mechanical operations on the vessels without causing brittleness. Apart from tin, other elements that are classified as trace elements were present,...