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Search Results: 1 - 10 of 1785 matches for " Majid Shahabi "
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Limiting distributions of the classical error terms of prime number theory
Amir Akbary,Nathan Ng,Majid Shahabi
Mathematics , 2013,
Abstract: In this article we prove a general theorem which establishes the existence of limiting distributions for a wide class of error terms from prime number theory. As a corollary to our main theorem, we deduce previous results of Wintner (1935), Rubinstein and Sarnak (1994), and of Ng (2004). In addition, we establish limiting distribution results for the error term in the prime number theorem for an automorphic $L$-function, weighted sums of the M\"{o}bius function, weighted sums of the Liouville function, the sum of the M\"{o}bius function in an arithmetic progression, and the error term in Chebotarev's density theorem.
Analysis of the Magnetic Flux Density, the Magnetic Force and the Torque in a 3D Brushless DC Motor  [PDF]
Majid Pakdel
Journal of Electromagnetic Analysis and Applications (JEMAA) , 2009, DOI: 10.4236/jemaa.2009.11001
Abstract: As permanent magnet motors and generators produce torque, vibration occurs through the small air gap due to the alternating magnetic forces created by the rotating permanent magnets and the current switching of the coils. The magnetic force can be calculated from the flux density by finite element methods and the Maxwell stress tensor in cy-lindrical coordinates. In this paper the magnetic flux density, the magnetic force and the torque of a real three dimen-sional brushless DC motor are simulated using Maxwell 3 D V 11.1.
Numerical Study of Fluid Flow over Bundle Tubes  [PDF]
Majid Almas
Journal of Electronics Cooling and Thermal Control (JECTC) , 2016, DOI: 10.4236/jectc.2016.63010
Abstract: In this paper, a bank of tubes containing a flowing fluid which is immersed in a cross flow second medium of fluid with different temperature has been studied numerically using computational fluid dynamics. Laminar steady flow with a low Reynolds number has been studied in this work. Inlet mass flow rate and the bulk temperature are known and numerical method has been implemented to study the convective heat transfer to investigate the temperature and flow fields. Effects of different inlet bulk temperatures and mass flow rates have been investigated on temperature and pressure variations.
The Presentation of a New Method for Image Distinction with Robot by Using Rough Fuzzy Sets and Rough Fuzzy Neural Network Classifier
Maryam Shahabi Lotfabadi
International Journal of Computer Science Issues , 2011,
Abstract: Distinguishing different images by robots and classifying them in distinct groups is an important issue in robot vision. In this paper we want to propose a new method for distinguishing images by robot via using Rough fuzzy sets' decreases method and Rough fuzzy neural network classifier. In this method, the image features like color, texture and shape are excluded and the redundant features are decreased by Rough fuzzy sets method. Then the Rough fuzzy neural network classifier is educated by the use of these decreased features. In next phase, the robot can properly classify the images; it has not seen or the examined images and put them in the correct group by the use of this system. We have compared our proposed method with Johnson decreased method, principal component analysis, and Rough sets, and also we have compared our classifier with the support vector- machine classifier, neural network and K-nearest neighbor. Our tests' bed is 1000 images of the COREL image set in ten semantic groups.
Infanticide as Instructing Ethics in “Rostam and Sohrab”
Hassan Shahabi,Marzieh Kouchaki
Canadian Social Science , 2013, DOI: 10.3968/j.css.1923669720130901.1113
Abstract: The present paper investigates the story of “Rostam and Sohrab” by Abolghasem Ferdowsi – the poet of the fourth century. This paper aims to demonstrate the relationship between infanticide by the major character of this work, Rostam, and ethical dilemmas in the light of Emmanuel Levinas’s notion of responsibility and depicts how instructing ethics will appear in the act of infanticide by him. Therefore, this paper shows how infanticide despite of being indecent is considered as an ethical dead in specific circumstances. Key words: Infanticide; Responsibility; Ethics
Crosbian Nihilistic Reading of Samuel Becket's Endgame and Sadegh Hedayat's Three Drops of Blood
Hassan Shahabi,Fatimah Mojdegani
Canadian Social Science , 2012, DOI: 10.3968/j.css.1923669720120805.1966
Abstract: Nihilism as a philosophical concept is an inner feature, related to the mind of the man. This study aims at showing the futility of life that causes hopelessness in man’s life through surveying the two selected works from world literature: Samuel Beckett’s Endgame and Sadegh Hedayat’s Three Drops of Blood. The works signify the internal problems, tensions, and valueless feelings of man toward living in the world. This article shows that the two works under analysis, despite their being the products of noticeably different times, places, languages, and cultures, similarly deal with the concept of nihilism as a -if not thedominant subject matter. It also proves that each of the two works tends to support its nihilism through a certain set of nihilistic arguments or themes, these sets remarkably overlap at some places, which further strengthens the two works thematic affinity, this time in terms of their attitudes towards their nihilism. Key words: Nihilism; Absurd; Literary works
Carbon nanotube plectonemes: Loops of twisted helices
Alireza Shahabi,Moneesh Upmanyu
Physics , 2014,
Abstract: The relaxation of twist in elastic filaments often drives conformational changes. We explore this paradigm using all-atom computations and report the formation of novel supercoiled shapes in individual carbon nanotubes (CNTs). Decreasing the end distance of torsionally constrained CNTs leads to spontaneous nucleation and growth of a nanotube plectoneme. We develop a stability diagram and comparisons with theoretical frameworks reveal the importance of non-local van Der Waals interactions. In some cases, they stabilize the supercoiling to an extent that its tip locally kinks and then irreversibly reconstructs into a disordered yet strengthened structure that involves $sp^3$ bonding. The ability to engineer supercoiled conformations of CNTs and related nanoscale filaments opens the possibility of a unique set of tunable functional properties at the nanoscale.
Evaluation of Zoiiran physical properties according to ISO 3107, BS 7214 and EN 23107
Shahabi S.,Tehrani Sefat M.
Journal of Dental Medicine , 2004,
Abstract: Statement of Problem: With due attention to the control of quality of dental materials and its role in"nimprovement of quality and accuracy of treatment, in this research, Zoiiran made in Golchai company was"nevaluated according to international standards."nPurpose: The aim of this study was the evaluation of properties of Zinc-oxide-eugenoi reinforced cement"nwith trade name "Zoiiran"."nMaterials and Methods: According to ISO 3107, BS 7214, EN 23107 standards (1991), the number of"nsamples were as follows: 2 for setting time, 5 for compressive strength, 4 for disintegration and 3 for film"nthickness testing. The experiments were followed standards instructions."nResults: Setting time was between 5.57-6.03 min. The compressive strength was between"n21.29-25.79 MPa. Zoiiran had about 1.3-1.5 % disintegration. Finally, the film thickness was between"n11-11.5 u."nConclusion: According to mentioned experiments, physical properties of Zoiiran as temporary cement of"nfixed-prosthodontic (Typel-class I) and base liner (Type IV-class I), were similar to stated standards.
Effect of potassium and zinc on growth and physiological parameters of tomato under cadmium stress in soilless system
Z. Ghasemi,A. A. Shahabi
Journal of Science and Technology of Greenhouse Culture , 2011,
Abstract: To study the effects of potassium and zinc on decreasing the cadmium (Cd) toxicity on growth and physiological parameters of tomato (Lycopersicon esculentum Mill.) a greenhouse experiment was conducted in a soilless system with complete randomized block factorial design. Zinc (Zn) was applied in three levels: 88.8, 177.6 and 355.2 μg L-1 as the first factor. The second factor was potassium (K) with three levels of 255, 510 and 1020 mg L-1. The base solution (Hoagland solution) contained 20 mM cadmium in all the treatments. The results showed that Zn treatments had significant effect on some growth indices including RGR, RLGR, LWR, LWCA, dry weight of aerial parts and soluble sugar content. Increasing the Zn level caused 7.7, 7.7, 3.3, 4 and 31.3% decrease in RGR, RLGR, LWR, LWCA and sugar content, respectively. The K treatments had significant effects on LAR, SLA, LWR, LWCA, NAR and root fresh weight. The LAR, SLA and LWR were increased 7.7, 15.3 and 6.9%, respectively. It was concluded that Zn had synergistic effect with Cd in tomato, and therefore co-existence of Zn and Cd reduced crop growth. Whereas, K application had antagonistic effect with Cd, and caused an increase in LAR and SLA. Interaction of K and Zn was not significantly effective on the measured parameters.
The Effect of Cadmium on Physiological Indices, Growth Parameters and Nutrient Concentration in Tomato in Soilless Culture
Z. Ghasemi,A. A. Shahabi
Journal of Science and Technology of Greenhouse Culture , 2010,
Abstract: In order to determine the effects of cadmium on growth, physiological parameters, and nutritional elements’ concentration in tomato organs in a soilless system, an experiment was conducted in greenhouse of Isfahan Agricultural and Natural Resources Research Center in 2008 with a complete randomized block design with two treatments and 6 replications. The treatments were nutritional solutions of Hoagland with and without cadmium (20 μM). The measured indices included: RGR, NAR, RLGR, LAR, SLA, LWR, LWCA, length of the stem, fresh and dry weight of root and shoot, amount of sugar, photosynthetic pigments, and concentration of nitrogen, potassium, phosphorous, calcium, magnesium, iron, zinc, copper, manganese, and cadmium in root, stem, leaves and fruit. The results showed that cadmium (20 μM) had significant effects on some measured growth indices. Growth parameters such as RGR, NAR, RLGR, Ls, RDW, RFW, SFW and SDW decreased 13.3, 19.1, 13.3, 18.8, 59.5, 58.7, 53.9 and 65.3%, respectively, and SLA increased 12.2%. But physiological parameters were not significantly affected by cadmium. The Cd concentration in all organs increased except fruit, compared with control which was Cd free. High cadmium concentration had significant effects on concentration of Mn and Cu in the root, Mn and P in the stem and Mn in the leaves. Concentration of Mn increased 5.3 and 87.6% in the leaves and stem, respectively, while it decreased 58.4% in the root. Concentration of P increased 33.3% and Cu increased 2times more in the stem. However, Ca concentration decreased 76.7% in the fruit, compared with the control. In conclusion, it is not recommended to grow tomato in the soils with high Cd concentration (polluted soil) because of its negative effects on tomato growth.
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