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Search Results: 1 - 10 of 543323 matches for " M. R. Afzali "
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Shear viscosity of the A_1-phase of superfluid 3He
M. A. Shahzamanian,R. Afzali
Physics , 2002, DOI: 10.1088/0953-8984/15/3/304
Abstract: The scattering processes between the quasiparticles in spin- up superfluid with the quasiparticles in spin-down normal fluid are added to the other relevant scattering processes in the Boltzmann collision terms. The Boltzmann equation has been solved exactly for temperatures just below T_c_1. The shear viscosity component of the A_1- phase drops as C_1(1-T/T_c_1)^(1/2). The numerical factor C_1 is in fairly good agreement with the experiments.
Shear viscosity of superfluid 3He-A_1 at low temperatures
M. A. Shahzamanian,R. Afzali
Physics , 2004, DOI: 10.1016/j.aop.2003.08.012
Abstract: The shear viscosity tensor of the A_1-phase of superfluid 3He is calculated at low temperatures and melting pressure, by using Boltzmann equation approach. The two normal and superfluid components take part in elements of the shear viscosity tensor differently. The interaction between normal and Bogoliubov quasiparticles in the collision integrals is considered in the binary, decay and coalescence processes. We show that the elements of the shear viscosities $\eta_{xy}$, $\eta_{xz}$ and $\eta_{zz}$ are proportional to $(T/T_c)^{-2}$. The constant of proportionality is in nearly good agreement with the experimental results of Roobol et al.
Quasiparticle relaxation rate and shear viscosity of superfluid 3He-A_1 at low temperatures
M. A. Shahzamanian,R. Afzali
Physics , 2004, DOI: 10.1016/j.physb.2003.11.078
Abstract: Quasiparticle relaxation rate,$\tau_{p}^{-1}$, and the shear viscosity tensor of the A_1-phase of superfluid 3He are calculated at low temperatures and melting pressure, by using Boltzmann equation approach in momentum space. The collision integral is written in terms of inscattering and outscattering collision integrals. The interaction between normal and Bogoliubov quasiparticles is considered in calculating transition probabilities in the binary, decay and coalescence processes. We obtain that both $\tau_{p\uparrow}^{-1}$ and $\tau_{p\downarrow}^{-1}$ are proportional to $T^2$ >. The shear viscosities $\eta_{xy}$, $\eta_{xz}$ and $\eta_{zz}$ are proportional to $(T/T_c)^{-2}$. The constant of proportionality of the shear viscosity tensor is in nearly good agreement with the experimental results of Roobol et al., and our exact theoretical calculation.
One Year Study of Chest X-Ray Changes in Opiate -poisoned Patients in Hamadan
Afzali S.,Jafari M.R.
Qom University of Medical Sciences Journal , 2010,
Abstract: Background and Objectives: Intoxication with opiates is one of the most common causes of referring to emergency departments in Iran. Because respiratory signs are one of the most common and important signs in these patients, this study was designed to evaluate the chest x-ray changes of the patients.Methods: The present study was a cross-sectional one. The changes noted in the Chest X-Ray (CXR) of the patients having been intoxicated with opiates and referred with respiratory signs of intoxication during the one year period between July 2007 till July 2008 to Farshchian Hospital in Hamadan were studied. The data, then, were gathered and analyzed using T and chi-square statistical tests.Results: Out of 1698 patients having referred due to poisoning with drugs and chemical agents, 318(18.72%) patients were admitted due to opiates intoxication. Among them, 214 (67.29%) had respiratory signs. 84.1% were male and 15.9% were female. Their average age was 35.6. The most important substance used was opium (57.5%).Most of the cases (84.1%) were due to abuse. The most common physical signs were: miosis (83.6%), respiratory distress (74.8%), rales & wheezing (67.3%). The most common radiographic abnormality was pulmonary edema (14.5%). And the most common substance causing pulmonary edema was crack (59.4%) revealing a significant statistical difference (p=0.001). Conclusion: As expected, one of the most important complications and common causes of death in opiate-poisoned patients was respiratory problems; we suggest that physicians and staffs working in the emergency department be well-trained in management of such patients.Keywords: Radiography, Thoracic; Analgesics, Opioid; Poisoning; Pulmonary Edema.
Effect of Low-Level Administration of Aflatoxin B1 into Diet on Performance and Activity of Some Blood Enzymes in Broiler Chickens
H. Kermanshahi,M. R. Akbari,N. Afzali
Journal of Science and Technology of Agriculture and Natural Resources , 2007,
Abstract: A feeding trail was conducted to evaluate the effects of diets contaminated with Aflatoxin B1 (AFB1) on the performance and blood enzymes of broiler chickens. In a randomized complete-block design with 4 blocks and 4 treatments, 112 day-old male broiler chicks were divided into 16 groups, 7 chicks per. Treatments consisted of three levels of AFB1 in starter diet (0.4, 0.8, and 1.2 ppm) along with a control group (no AFB1). Feed intake and body weight gain were recorded on a weekly basis. On days 7, 14, 21, and 28, one bird from each replicate was weighed, and killed to collect the blood samples, and to weigh its proventriculus, gizzard, duodenum and pancreas, heart, liver, spleen, bursa of fabricius, and brain. Feeding AFB1 significantly decreased feed intake and body weight gain and increased relative weight of liver (p
Dependence of interface conductivity on relevant physical parameters in polarized Fermi mixtures
N. Ebrahimian,M. Mehrafarin,R. Afzali
Physics , 2012, DOI: 10.1016/j.physc.2012.05.013
Abstract: We consider a mass-asymmetric polarized Fermi system in the presence of Hartree-Fock (HF) potentials. We concentrate on the BCS regime with various interaction strengths and numerically obtain the allowed values of the chemical and HF potentials, as well as the mass ratio. The functional dependence of the heat conductivity of the N-SF interface on relevant physical parameters, namely the temperature, the mass ratio, and the interaction strength, is obtained. In particular, we show that the interface conductivity starts to drop with decreasing temperature at the temperature, $T_{\text{m}}$, where the mean kinetic energy of the particles is just sufficient to overcome the SF gap. We obtain $T_{\text{m}}$ as a function of the mass ratio and the interaction strength. The variation of the heat conductivity, at fixed temperature, with the HF potentials and the imbalance chemical potential is also obtained. Finally, because the range of relevant temperatures increases for larger values of the mass ratio, we consider the $^6\text{Li}$-$^{40}\text{K}$ mixture separately by taking the temperature dependence of the pair potential into account.
Linear response of heat conductivity of normal-superfluid interface of a polarized Fermi gas to orbital magnetic field
N. Ebrahimian,M. Mehrafarin,R. Afzali
Physics , 2011, DOI: 10.1016/j.physb.2011.10.005
Abstract: Using perturbed Bogoliubov equations, we study the linear response to a weak orbital magnetic field of the heat conductivity of the normal-superfluid interface of a polarized Fermi gas at sufficiently low temperature. We consider the various scattering regions of the BCS regime and analytically obtain the transmission coefficients and the heat conductivity across the interface in an arbitrary weak orbital field. For a definite choice of the field, we consider various values of the scattering length in the BCS range and numerically obtain the allowed values of the average and species-imbalance chemical potentials. Thus, taking Andreev reflection into account, we describe how the heat conductivity is affected by the field and the species imbalance. In particular, we show that the additional heat conductivity due to the orbital field increases with the species imbalance, which is more noticeable at higher temperatures. Our results indicate how the heat conductivity may be controlled, which is relevant to sensitive magnetic field sensors/regulators at the interface.
Physics of Light in the North Coasts of Persian Gulf (Bushehr province) during Winter Season
M. Torabi Azad,H. Hosseini,M. R. Afzali,Moz.Emtyazjoo
Latin-American Journal of Physics Education , 2011,
Abstract: We present a study to field measurement and laboratory experiments of light for university students in physical oceanography. During 6thto 8thof February 2009 in two stations of Bushehr province central coasts, sampling of sea water and other effective physical parameters were carried out. The effects of laser light in 532, 659, and 980nm on the collected water samples in two different stations were studied. Then light attenuation coefficient and the amount of light penetration percentage for these stations at different depths were calculated. According to the results of this study, light attenuation coefficient in the first station, the wave length for red and infrared lights is more than the wave length for green light. For red and infrared wave lengths the amount of light absorption in the first station is more than the second one. The salinity, temperature, and cloud cover parameters are not effective in the amount of light absorption. The effective factor in increasing the amount of light absorption in this station than the second station is water turbidity
Compensatory growth assessment by plasma IGF-I hormone measurement and growth performance in rainbow trout (Oncorhynchus mykiss)
R Rahimi, M Farhangi, BM Amiri, F Rezaie, P Norouzitallab, A Afzali
African Journal of Biotechnology , 2010,
Abstract: This study aimed to show the difference in compensatory growth (CG) with different starvation and feeding periods replications, depending on the IGF-I hormone level in the blood. There were 4 treatments in 3 replications. Other indexes like food coefficient ratio (FCR), specific growth rate (SGR) and daily food intake were also examined during the experiment. Fish were fed twice a day ad libitum as follows during the 65 days. Treatment A (TA): control treatment, continues feeding. Treatment B (TB): 4 weeks of starvation and 5 weeks of re-feeding. Treatment C (TC): 3 weeks of starvation and 5 weeks of re-feeding. Treatment D (TD): 2 weeks of starvation and 5 weeks of re-feeding. Each tank contained 23 fishes in each unit with an initial mean weight (SD) of 47.19 ± 0.42 (g). Blood was sampled in IGF-I hormone concentration at the beginning of the experiment, at the end of the starvation period and every 12 days in re-feeding periods. There was no significant difference between the treatments in FCR (P > 0.05). TB and TC had significant difference (P < 0.01) in comparison with other treatments in SGR, but no significant difference was observed among them (P > 0.05). IGF-I concentrations came down in comparison with control treatment at the end of the starvation period (Day 29) (P < 0.001), but no significant difference was observed among the treatments at the end of the re-feeding period (P > 0.05). According to the results, TB and TC showed more indexes of CG in comparison with TA and TD. Still IGF-I cannot show the quality of CG alone and other growth relating physiological elements in different feeding diets and regimes will be evaluated in future studies.
The Effect of Esophagectomy and Cervical Esophagogastrostomy with or Without of Pyloromyotomy on Emptying of intrathoracic Stomach
Gh.A. Godazandeh, M.D,H. Khani, M.D,S.L. Afzali, M.D,A.R. Khalilian, Ph.D
Journal of Mazandaran University of Medical Sciences , 2007,
Abstract: Background and purpose: A gastric conduit is usually used to reconstruct the foregut after esophagectomy for cancer. The gastric emptying may be impaired after this operation, so some esophageal surgeons routinely add a pyloric drainage procedure. The aim of this study was to determine the emptying of the intrathoracic stomach after esophagectomy and cervical esophagogastrostomy with or without pyloromyotomy.Materials and Methods: Between January 2003 and April 2006, in a randomized controlled trial, 30 patients with esophageal carcinoma were randomized to have with or without pyloromyotomy as a gastric emptying procedure for the gastric conduit used for esophageal replacement. Patterns of gastric emptying in the vagotomized intrathoracic stomach were studied using radioisotope techniques. Gastric emptying (GE) was evaluated 8 weeks after the operation. Patients were available for 6 months follow-up.Results: A total of 30 patients were enrolled in this study. Sixty percent (18) were male, and 40% (12) were female. Twenty three patients (76.7%) had squamous cell carcinoma and 7 (23.3%) had adenocarcinoma. Delayed GE was reported in 11 (73.3%) and normal GE in 4 (26.7%) of patients with Pyloromyotomy. Delayed GE was reported in 9 (60%) and normal GE in 6 (40%) of patients without Pyloromyotomy. There were not any significant differences between complications of post surgery in both groups.Conclusion: These findings were showed that esophageal surgery can be don’t add a pyloric drainage procedure in esophagectomy and cervical esophagogastrostomy and that very few patients actually need it.
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