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Search Results: 1 - 10 of 1737 matches for " Majid Pakdel "
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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.
A New Topology and Control Strategy for Harmonic Elimination and Power Factor Correction Using a Series Active Power Filter
Majid Pakdel,Khalil Rahimi Khoshoei
Lecture Notes in Engineering and Computer Science , 2007,
Effect of soluble Carcinoembryonic antigen on myogenic and enterocytic differentiation
Abbas Pakdel,Fakhraddin Naghibalhossaini
Koomesh , 2013,
Abstract: Introduction: Carcinoembryonic antigen (CEA), a glycophosphatidyl inositol (GPI) anchored glycoprotein, is over-expressed in various cancers, including colorectal carcinomas. Inhibition of cell differentiation can cause cancer. Previous studies show transfection and over-expression of CEA gene in myoblasts or colonocytes leads to inhibition of cell differentiation. We investigated whether soluble CEA has a role in inhibition of cell differentiation.Materials and Methods: Monolayer cultures of L6, C2C12, Caco-2 and CHO cell lines were grown in dulbecco's modification of eagle's medium (DMEM) containing 10% fetal bovine serum (FBS). For differentiation induction C2C12 and L6 cell lines media, was changed to DMEM containing 2% horse serum. CEA concentration was measured in harvested media by ELISA assay. H&E staining, CK assay and RT-PCR for myogenin gene were used for C2C12 differentiation experiments. Results: The results showed although commercial pure CEA and LS-180 conditioned media (contain high level of CEA) have inhibitory effects on Caco-2 differentiation, but it can also inhibit differentiation of control groups. We observed the effect of high concentration of CEA (5μg/ml) on L6 differentiation is identical with the effect of BSA as control. C2C12 differentiation was inhibited in response to LS-180 conditioned media at morphological level and myogenin expression. CK activity was significantly lower in LS-180 conditioned media (P= 0.0012) and CHO (P= 0.0002) conditioned media groups in comparison to control group.Conclusion: Our finding shows soluble CEA antigen did not have a significant effect on cell differentiation.
The Effects of Warm-Up Tasks on the Iranian EFL Students' Writing Ability
Zahra Pakdel,Mohammadreza Khodareza
International Education Studies , 2012, DOI: 10.5539/ies.v5n2p190
Abstract: This study aims to investigate the effects of warm up tasks as classroom activities on foreign language written production. For showing these effects, sixty out of one hundred forty Iranian sophomore EFL students from the Islamic Azad University of Lahijan branch, Iran were selected after following the Oxford Placement Test (OPT). Then, they were randomly divided into two groups; the experimental group who received the treatments on warm up tasks, and the control group who received a placebo. Both groups had to write two paragraphs of about 150 words that were considered as their pretests and posttests. The paragraphs were corrected by three experienced raters. Their scores analyzed through SPSS by applying Independent t-test, and Paired sample t-test. The findings revealed that participants in the experimental group, who had received the treatments on warm up tasks, significantly enhanced better performance in a writing test.
Faraday Rotation and Circular Dichroism Spectra of Gold and Silver Nanoparticle Aggregates
Sahar Pakdel,MirFaez Miri
Physics , 2012, DOI: 10.1103/PhysRevB.86.235445
Abstract: We study the magneto-optical response of noble metal nanoparticle clusters. We consider the interaction between the light-induced dipoles of particles. In the presence of a magnetic field, the simplest achiral cluster, a dimer, exhibits circular dichroism (CD). The CD of a dimer depends on the directions of the magnetic field and the light wave vector. The CD of a populous cluster weakly depends on the magnetic field. Upon scattering from the cluster, an incident linearly polarized light with polarization azimuth $\varphi$, becomes elliptically polarized. The polarization azimuth rotation and ellipticity angle variation are sinusoidal functions of $2 \varphi$. The anisotropy and the chirality of the cluster control the amplitude and offset of these sinusoidal functions. The Faraday rotation and Faraday ellipticity are also sinusoidal functions of $2 \varphi$. Near the surface plasmon frequency, Faraday rotation and Faraday ellipticity increase.
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.
Effects of long term perinatal administration of Bupropion on population spike amplitude in neonatal rat hippocampal slices
Soomaayeh Heysieattalab,Samad Zare,Firouz Ghaderi Pakdel
Koomesh , 2010,
Abstract: Introduction: The perinatal effects of antidepressants on CNS due to its common usage are importantissues in neuroscience research. Bupropion is an atypical antidepressant that is used in smoke cessationunder FDA approve widely. The study of synaptic effects of bupropion can reveal its mechanism fornicotine dependence cessation. In this study the long term effects of perinatal bupropion on populationspike (PS) amplitudes were investigated. The PS amplitude is a good parameter for synaptic plasticity.Materials and Methods: Hippocampal slices from 18-25 day old rat’s pups were prepared. The examgroups included control and Bupropion treated groups. Bupropion (40 mg/Kg, i.p) was applied inperinatal period daily as pretreatment. Bupropion also was perfused in ACSF (10, 50, 200 μ mol, 30minutes) and tested for PS amplitude. PS amplitude of Stratum Radiatum was measured before and afterBupropion perfusion. Amplitude of PS before Bupropion perfusion was fitted as 100% for baseline.Results: A concentration of 10 μM did not reduce PS amplitude and Bupropion had no significanteffects on PS amplitude. Bupropion in concentration of 50μM could reduce the amplitude of responses in50% of cases. The 200 μM of Bupropion perfusion reduced population spike amplitude all slices (n=22).In the last state population spike amplitude in 8 out 0f 22 slices completely abolished. Decreasepopulation spike amplitude in non-treated slices with 200 μM perfusion was more than treated slices.Conclusion: Analyzing of data showed that chronic perinatal exposure to Bupropion in concentrations50,200 μM reduced PS amplitude and we found adaptation synaptic in perfusion 200 μM compare withBupropion treated slices with non- treated.
Effects of acute intra-hippocompal injection of bupropion on active avoidance learning in rats
saber ghaedrpour,samad zare,firouz ghaderi pakdel
Physiology and Pharmacology , 2010,
Abstract: Introduction: Learning and memory deficits in some diseases are new subjects of research. Bupropion, as dopamine and noradrenaline reuptake inhibitor and an antidepressant agent, has been previously shown to affect learning and memory processes. This study was designed to test the effect of intra-hippocompal bupropion injection on active avoidance learning task in rats. Methods: Adult male Wistar rats (obtained from Pasteur Institute of Iran, weighing 200-250 g) were tested for learning behavior in a two-way active avoidance shuttle-box. The animals were divided into control, sham operated, vehicle and 3 treatment groups treated with different doses of intra-hippocampal bupropion (0.25 mg/1 μL, 1.25 mg/5 μL and 2.5 mg/10 μL, injected during 1-2, 5 and 10 min, respectively). Drug was injected by a stereotaxic implanted guide cannulae. Briefly, 10 days after the stereotaxic surgery, rats were trained (20 trails, 2 times each day) in a twoway active avoidance task shuttle box. Sessions were started at the same time of the day and an interval of 5 hours was between the 2 sessions. Tests were repeated on 5 consecutive days. Rats received bupropion or vehicle 30 min before each test and the learning process was assessed. Results: Analysis of the data showed significant differences in the number of avoidance reactions in the early sessions of trials of the learning tasks between vehicle and bupropion treated animals (p<0.05). Conclusion: Bupropion can decrease the number of avoidance reactions and increase the reaction latency. Although bupropion is a dopamine reuptake blocker, but it is concluded that bupropion can bind to other receptors such as acetylcholine receptors and interfere with the learning and memory processes. Key words: Bupropion, Shuttle-box, Active avoidance learning, Hippocampus, Antidepressant
A User-friendly CAPTCHA Scheme Based on Usability Features
Rezvan Pakdel,Seyedkaveh Ranjbar,Mohammad Hashemi
Information Technology Journal , 2013,
Abstract: CAPTCHA is stand for completely automated public turing test to tell computers and humans apart which is the test generated and graded by computers in order to check the users’ humanity. CAPTCHA has benefit to protect online and free services from bots. Bots is defined as software that can access heavily to services without permission. Currently, several different types of CAPTCHA have been proposed in which the main problem is not security that is usability. The way of choosing features of a CAPTCHA that previous researchers have used was not based on the fact of human and computer interaction rules which is to value human part rather than resources. This research studies usability issues of the existing CAPTCHA schemes and proposes a sort of usability features based on what users choose in a user affinity of choice survey. Finally, a sort of usability features is presented and transferred to a user-friendly CAPTCHA scheme as a result of this study. The most important contribution of this study is consideration of people in various ranges of age and people in different languages to be able to solve CAPTCHA. So, it is claimed that the proposed CAPTCHA scheme is a language-independent scheme and also a usable scheme for all ranges of age.
The Relationship between the Big Five Personality Factors and Job Burnout
Hamze Gholami Dargah,Zahra Pakdel Estalkhbijari
International Journal of Asian Social Science , 2012,
Abstract: In recent decades, research about job burnout and its relationship with the personality factors has become increasingly important in domain of psychology and management. This study aims to investigate the relationship between Burnout as measured by the Maslach Burnout Inventory(Maslach, C, Jackson, S. E., and Leiter, M. P., 1996) and the Big Five Personality Factors(Costa, P. T., and McCrae, R. R. 1989). The Participants were 196 out of 400 workers from an automobile factory of Lahijan, Iran, who were chosen randomly to participate in this study. The data was collected through questionnaires, and then analyzed through SPSS by applying descriptive statistics, and Pearsons’Cofficient Correlation. The results revealed that extroversion, agreeableness, and openness of experience had negative relationships with job burnout. On the other hand, there were positive relationships between conscientiousness and neuroticism with job burnout.
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