oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2019 ( 3 )

2018 ( 19 )

2017 ( 12 )

2016 ( 15 )

Custom range...

Search Results: 1 - 10 of 2032 matches for " Alireza Ashofteh "
All listed articles are free for downloading (OA Articles)
Page 1 /2032
Display every page Item
The Introduction of Promising Mineral Zones Bidkhan Area Using Satellite Imagery  [PDF]
Alireza Ashofteh
Open Journal of Geology (OJG) , 2017, DOI: 10.4236/ojg.2017.79093
Abstract: On the basis of new findings and some evidences related to porphyry mineralization, the exploration region of Bidkhan is considered as a promising mineral region for discovery of porphyry sort deposits. The findings from various sections indicate that diverse topological events in a zonal and regional time span have resulted in physiochemical (thermodynamic) systems leading to expansive alterations (metamorphism) and mineralization in the central region of Bidkhan area. Alterations such as Propylitic, Silicating, Argillic, Phyllic and even Potassic concentrates at an area of about 10 km2 together with such structures as fissures have created the required and suitable condition for the formation of thermodynamic systems. Such systems are related to mineralization fluids mineralizer that accompanies the sort of activities that are clearly indicative of the existence of an active igneous source all forming a terrene at Bidkhan region which is very similar to mineralization porphyry systems.
An Investigation into the Metal Potentials across Bidkhan Area Based on Economic Geological Studies  [PDF]
Alireza Ashofteh, Ahmad Adib
Open Journal of Geology (OJG) , 2015, DOI: 10.4236/ojg.2015.511064
Abstract: The study area is situated in the NW-trending Urumieh-Dokhtar volcanic belt evolved during Arabia-Eurasia convergence. At the center of Bidkhan, there is an area of approximately 10 km2, which is an altered volcanic-intrusive complex. Effort will be made to provide a more accurate picture of the alteration landscape across Bidkhan on the map. The purpose is to clarify how alteration at several points has occurred so as to understand the features of alteration. The altered area is covered by younger events, which have in turn gone through alteration covering another type of alteration on the lower layer. Studies show that there are no traces of either metallic or non-metallic mining activities in the region. The only notable point is the rare remnants of slags spread sporadically across one spot of the region. It is unknown where the small pieces of slag about 10 cm × 10 cm originate from and which mineralization is involved. It seems that due to the expansion of copper mineralization at Bidkhan, the slags are produced from the copper smelting.
Studying Petrology and Determining Tectonic Setting of Bidkhan Area Southeast of Iran  [PDF]
Ahmad Adib, Alireza Ashofteh
Open Journal of Geology (OJG) , 2015, DOI: 10.4236/ojg.2015.510060
Abstract: Bidkhan region has an area of approximately 104 km2. This region includes all the heights and villages that are known by the name of Bidkhan. Chemical nomenclature of igneous rocks is performed with the help of main oxide plots. Based on the analysis results of the samples with minimum alteration, position of these samples was obtained on special diagrams. The achieved data should be compatible with field evidences at a regional scale. There are some limits to the interpretation of the harvested samples on chemical nomenclature diagrams for igneous rocks that should be taken into account. Lithology of Bidkhan region was performed using the main oxides that were obtained from XRF method. 30 sample rocks, which were very fresh and without alteration, were used for drawing diagrams and determining the position of these regional rocks on the chemical nomenclature diagrams for igneous rocks. The results for the analysis of the main oxides of these 30 samples are also presented.
Subcutaneous Tissue Responses to Three Endodontic Irrigants: A Comparative Study
Kazem Ashofteh Yazdi,Mohammad Sabeti,Pooriya Motahhary,Alireza Kolahdouzan
Iranian Endodontic Journal , 2012,
Abstract: Introduction: This study aimed to compare the subcutaneous tissue responses to MTAD (mixture of a tetracycline isomer, an acid, and a detergent), 17% EDTA, and 2.6% NaOCl. Materials and Methods: Thirty-six Wistar albino rats were used for this study. Test solutions were injected subcutaneously into predetermined areas on the animal dorsum. The rats were then randomly divided into three groups of twelve each and sacrificed at 2 hours, 2 days, and 2 weeks. The severity of inflammation induced by each irrigant at different time intervals was assessed histologically. The data were analyzed using Kruskal-Wallis and Friedman tests. Results: The difference in severity of inflammatory reactions induced by tested irrigants at the different time intervals was statically significant (P<0.05). There was no significant difference between the severity of inflammation induced by MTAD and 2.6% NaOCl at the various time intervals (P>0.05). Subcutaneous tissue responses to MTAD were not different from those observed in 17% EDTA specimens at 2-hour and 2-day intervals (P>0.05). Conclusion: Under the conditions of this study, MTAD has the same toxicity as 2.6% NaOCl.
Study of the Internal Anatomy of the Mandibular Incisor Teeth
K. Ashofteh Yazdi,A. Jafari
Journal of Dentistry of Tehran University of Medical Sciences , 2004,
Abstract: Statement of Problem: Knowledge of internal anatomy of tooth plays an important role in a successful endodontics treatment. For a proper endodontic treatment, it is not only important to know the form of normal anatomy of tooth’s interior but one must also beacquainted with the possible diverse forms.Purpose: A thorough understanding of the internal anatomy of human mandibular incisors (central and lateral).Materials and Methods : A total of 205 central and lateral mandibular incisors that had healthy roots were selected and put in 10% formalin solution. After cleaning the samples with the help of brushes and other devices, they were kept in 5% sodium hypochloritesolution. Finally the roots were cleaned and the samples were prepared for next stages.Three methods were used, coloring (fushin1%, radiography (buccolingual and proximal sides), and cross-sectioning (cervical- middle-apical).Results: The result indicated that:- 88%of the teeth had a single canal and one apical foramen;- 8% of the teeth had a single canal and two apical foramena;- 3.5% of the teeth had two canals and one apical foramen;- 0.5% of the teeth had two canals and two apical foramena;Conclusion:A thorough understanding of the pulp morphology is essential for successful treatment of root canal. Therefore, a dentist should always be on the watch for the existence of two canals or a two-branched canal while working on the mandibular incisor teeth. it is essential to have the necessary precision in finding the second canal.
Studying Quad Life of Reza Shah Pahlavi
Mohammad Javad Ashofteh, Fatemeh Yaghoubi
International Journal of Nations Research , 2018, DOI: -
Abstract: The current research is under title quad Reza Shah's Life. Because always only those who are running programs on display screen are not all main actors but also exist other actors that play a role behind the screen. Also at the court of Reza Shah it was the same as in the memoirs of Soraya Esfandiari is mentioned to Pahlavi's court femininity the clues and tricks of these women to achieve their goals. According to the role that Reza Shah's women especially Taj al-Muluk played in court and politics of the country, can be known Pahlavi's government an influential government of women's power. Because in other books and articles related to the Pahlavi dynasty about Reza Shah's other women and children less talk has been made, this research is trying to answer this question by historical-analytical method that what was Reza Shah's four times marriage reason? And that who have been his wife and children and what role they played in arena politics.
An Actual Survey of Dimensionality Reduction  [PDF]
Alireza Sarveniazi
American Journal of Computational Mathematics (AJCM) , 2014, DOI: 10.4236/ajcm.2014.42006
Abstract:

Dimension reduction is defined as the processes of projecting high-dimensional data to a much lower-dimensional space. Dimension reduction methods variously applied in regression, classification, feature analysis and visualization. In this paper, we review in details the last and most new version of methods that extensively developed in the past decade.

A QMR-Type Algorithm for Drazin-Inverse Solution of Singular Nonsymmetric Linear Systems  [PDF]
Alireza Ataei
Advances in Linear Algebra & Matrix Theory (ALAMT) , 2016, DOI: 10.4236/alamt.2016.64011
Abstract: In this paper, we propose DQMR algorithm for the Drazin-inverse solution of consistent or inconsistent linear systems of the form Ax=b where \"\"?is a?singular and in general non-hermitian matrix that has an arbitrary index. DQMR algorithm for singular systems is analogous to QMR algorithm for non-singular systems. We compare this algorithm with DGMRES by numerical experiments.
Impact of Climate Change on Maximum Discharges: Case Study of Aidoghmoush Basin, East Azerbaijan
P. Ashofteh,A. R. Massah Bouani
Journal of Science and Technology of Agriculture and Natural Resources , 2010,
Abstract: Climate change has different impacts on extreme events such as flood and drought. However, in Iran there are few researches about the impacts. This research was aimed to investigate maximum annual discharge (magnitude and frequency) that may occur due to climate change in Aidoghmoush Basin during 2040-2069 (2050s). At first, monthly temperature and precipitation data of HadCM3 model under the SRES emission scenario, namely; A2 , was provided for the basin. Then, these data were downscaled spatially and temporally to Aidoghmoush basin by proportional and change factor downscaling methods. Results showed that the temperature increases (between 1.5 to 4) and the precipitation varies (30 to 40 percent) in 2040-2069 compared with baseline period (1971-2000). A semi-conceptual model (IHACRES) for simulation of daily runoff was calibrated. Downscaled temperature and Precipitation for 2050s were introduced to IHACRES and daily runoff was simulated for the future. Probability distribution was fitted to maximum annual discharge series and the maximum discharge regime of the future was compared with the baseline. Results indicated that climate change affects Maximum discharge in the regime of the basin. Also, the analysis showed that the intensity of maximum discharges for the time period less than 50 does not show any significant difference; but by increasing the return period, the intensity increases in future periods. Moreover, it was shown that the probability of maximum discharges with constant intensity will decrease in the future compared to the baseline.
Study of the aerobic contamination of four disposable materials (anesthetic cartridge, saliva ejector tip, gutta percha and cotton roll)
Ashofteh Yazdi K.,Fathollah Zadeh B.,Daneshvar Sh
Journal of Dental Medicine , 2005,
Abstract: Statement of Problem: Today, cross infection control is an integral part of dentistry and many dental health care workers no longer question its necessity. All dental equipments and instruments could be potentially considered as a source of infection. Purpose: The aim of this study was the evaluation of aerobic contaminations of four disposable materials used in routine dental practice. Materials and Methods: In this cross-sectional study, random sampling was performed and tryptone soy broth transfer culture medium was used. After 24 hours of incubation, samples were transferred to specific culture media. (Mckangy, Chocolate agar and Blood agar). Cultured bacteria were stained and studied using gram staining method. The study was carried out in a 17 weeks period. Results: All suction tips were infected with Bacillus cereus bacterium. Two cases of cotton roll samples showed contamination with Bacillus cereus, 2 cases with gram positive, coagulase negative cocci, 1 case with Streptococcus viridians and one case with Enterobacter class A. One case of anesthetic cartridges was contaminated with Staphylococcus epidermidis and two cases with Streptococcus viridians. Two cases of gutta-percha samples were contaminated with Bacillus cereus. Conclusion: Based of the findings of this study, the highest level of contamination was observed in saliva ejector tips. Contamination with Bacillus cereus was seen more frequently.
Page 1 /2032
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.