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Search Results: 1 - 10 of 6223 matches for " Reza Nouri "
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Lineament Tectonics and Mineralizatin in Tarom Area, North Iran  [PDF]
Mehran Arian, Reza Nouri
Open Journal of Geology (OJG) , 2015, DOI: 10.4236/ojg.2015.53011
Abstract: The study area that is part of Tarom volcano-plutonic zone which host many hydrothermal base metal deposits located in Zanjan, NW Iran. Understanding the tectonic events that can cause mineralization and hydrothermal alteration are significant factor in assessing the exploration potential of different structures. In this research, hydrothermal alteration such as Iron oxide, argillic, phyllic, and propylitic zones were determined by Spectral Angle Method (SAM) and also lineaments identified by high pass filters and hill-shade DEM techniques on Advanced Space borne Thermal Emission and Reflection Radiometer (ASTER) data. Field studies revealed most alteration and mineralization occurred in NE-SW fractures and control mineralization.
Designing a Carbon Nanotube Field-Effect Transistor with High Transition Frequency for Ultra-Wideband Application  [PDF]
Ramin Nouri-Bayat, Ali Reza Kashani-Nia
Engineering (ENG) , 2017, DOI: 10.4236/eng.2017.91003
Abstract: Theoretical calculations predict transition frequencies in the terahertz range for the field-effect transistors based on carbon nanotubes, and this shows their suitability for being used in high frequency applications. In this paper, we have designed a field-effect transistor based on carbon nanotube with high transition frequency suitable for ultra-wide band applications. We did this by optimizing nanotube diameter, gate insulator thickness and dielectric constant. As a result, we achieved the transition frequency about 7.45 THz. The environment of open source software FETToy is used to simulate the device. Also a suitable model for calculating the transition frequency is presented.
Nature of L2 Grammatical Proficiency: A Multi-Dimensional Approach
Ahmad Reza Lotfi,Behrouz Nouri Samani
International Journal of English Linguistics , 2011, DOI: 10.5539/ijel.v1n1p199
Abstract: This is a study with descriptive hypothesis-testing design investigating the true nature of L2 grammatical proficiency by focusing on its component parts. It examines the performance of 60 female EFL learners between 19 and 30 years of age at 2 levels of proficiency using 2 types of computerized Grammaticality Judgement tasks in different orders (i.e. Written Stimulus GJ task and Oral Stimulus GJ task) for each participant at a 1 week interval for 2 weeks per each task to determine the extent to which L2 learners' performance is affected by a few components of grammatical proficiency chosen and manipulated out of a great many that exist (i.e. written-oral dichotomy [viz. modality]) as well as language proficiency while focusing on Subjacency. Participants rendered GJ tasks on a 2-point interval. Results from analyzing the elicited measurement data indicated that the performance scores of the two proficiency groups in the two Grammaticality Judgement tasks did not differ significantly.
The Effect of Persian L2 Learners’ Proficiency Level on their Degree of Observing Subjacency in L2
Behrouz Nouri Samani,Ahmad Reza Lotfi
Theory and Practice in Language Studies , 2011, DOI: 10.4304/tpls.1.12.1718-1730
Abstract: This experimental study examined how L2 learners’ L2 proficiency level affected their performance in GJ tasks while rendering WH-questions using a repeated measures design. Participants included 60 female Persian EFL participants from the Islamic Azad University - Khorasgan Branch - at two levels of English proficiency (i.e. High- and Low-Intermediate levels). The instruments (i.e. explicit written, implicit written, oral stimulus, and no stimulus GJ tasks) involved rendering different cases of subjacency in four consecutive time settings for four weeks per each GJ task by each participant. The results revealed that L2 proficiency level is of no significant effects on the L2 learners’ performance on WH-questions.
An Abattoir Study of Thyroid Histopathology in Ewes and their Fetus in Ahvaz City of Iran
Mohammad Nouri,Babak Mohammadian,Reza Pourjamshid
Veterinary Research Forum , 2010,
Abstract: The thyroid structural changes in pregnant ewes and their fetuses were investigated. Out of 100 pairs of thyroid glands collected from ewes and their fetuses at the local municipal abattoir in Ahvaz city of Khuzestan province, multiple lesions were seen in 59% and 21% of the thyroid glands of ewes and fetuses, respectively. Histologically, ninety nine lesions in the ewes and twenty two lesions in the fetuses’ thyroid glands were noticed.
Nature of L2 Grammatical Proficiency: A Multi-Dimensional Approach
Ahmad Reza Lotfi,Behrouz Nouri Samani
International Education Studies , 2011, DOI: 10.5539/ies.v4n1p55
Abstract: This is a study with descriptive hypothesis-testing design investigating the true nature of L2 grammatical proficiency via focusing on its component parts. It examines the performance of 60 female EFL learners between 19 and 30 years of age at 2 proficiency levels using 2 types of computerized Grammaticality Judgement tasks in different orders (i.e. Explicit Written Task and Implicit Written Task) for each participant at a 1 week interval for 2 weeks per each task to determine the extent to which L2 learners' performances are affected by a few components of grammatical proficiency chosen and manipulated out of many others that exist (i.e. Implicit Knowledge, and Explicit knowledge) as well as language proficiency while focusing on subjacency. Participants rendered GJ tasks on a 2-point interval. Results from analyzing the elicited measurement data indicate that the performance scores of the two proficiency groups in the two Grammaticality Judgement tasks did not differ significantly.
Effects of Attention and Levels of Processing on Explicit and Implicit Memory Function with Interesting and Uninteresting Tasks in University Students
Alireza Mahdavian,Reza Kormi-Nouri
Journal of Applied Sciences , 2008,
Abstract: This study aims to investigate the effect of attention and levels of processing on memory function and recalling words in two situations when students are interested in the subject and when they are not. This is an experimental study of 160 students conducted individually using a computer software. Results reveal focused attention, interest in the subject and deep processing caused the explicit memory to be at its highest level of functionality. On the contrary, shallow processing, divided attention and lack of interest in the subject plunged memory function into its lowest levels. Variables have different effects on attention, explicit and implicit memory. That is, interesting tasks with focused attention and deep processing have the highest effect on explicit memory in order. Also, interesting tasks, focused attention, respectively affect implicit memory. But level of processing does not affect implicit memory significantly.
Gauged motion in general relativity and in Kaluza-Klein theories
Mohammad Nouri-Zonoz,Ali Reza Tavanfar
Physics , 2002, DOI: 10.1088/1126-6708/2003/02/059
Abstract: In a recent paper [1] a new generalization of the Killing motion, the {\it gauged motion}, has been introduced for stationary spacetimes where it was shown that the physical symmetries of such spacetimes are well described through this new symmetry. In this article after a more detailed study in the stationary case we present the definition of gauged motion for general spacetimes. The definition is based on the gauged Lie derivative induced by a threading family of observers and the relevant reparametrization invariance. We also extend the gauged motion to the case of Kaluza-Klein theories.
Plane symmetric analogue of NUT space
Mohammad Nouri-Zonoz,Ali Reza Tavanfar
Physics , 2001, DOI: 10.1088/0264-9381/18/20/308
Abstract: In this article on the basis of a new definition of spacetime symmetry, which is in accordance with the symmetry of the curvature invariants, we investigate exact vacuum solutions of Einstein field equations corresponding to both static and stationary plane symmetric spacetimes using the concepts of the (1+3)-decomposition or threading formalism. Demanding the presence of a plane symmetric gravitomagnetic field we find a family of two parameter (m and l) solutions, every member of which being the plane symmetric analogue of NUT space.
An effective thickness proposal for strength evaluation of one-side pitted steel plates under uniaxial compression
Nouri, Zorareh Hadj Mohammad Esmaeil;Khedmati, Mohammad Reza;Sadeghifard, Shokoufeh;
Latin American Journal of Solids and Structures , 2012, DOI: 10.1590/S1679-78252012000400004
Abstract: this paper presents the results of an investigation into the post-buckling behaviour and ultimate strength of imperfect pitted steel plates used in ship and other marine-related structures. a series of elastic-plastic large deflection finite element analyses is performed on pitted steel plates. the effects of pitting corrosion on one side of the plates are introduced into the finite element models. the effects on plate compressive strength as a result of parametric variation of the pitting corrosion geometry are evaluated. a proposal on the effective thickness is concluded in order to estimate the ultimate strength and explore the post-buckling behaviour of pitted steel plates under uniaxial compression.
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