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Investigation of fusion gain in fast ignition with conical targets
MJ Tabatabaei,A Ghasemizad
Iranian Journal of Physics Research , 2011,
Abstract: Fast ignition is a new scheme for inertial confinement fusion (ICF). In this scheme, at first the interaction of ultraintense laser beam with the hohlraum wall surrounding a capsule containing deuterium-tritium (D-T) fuel causes implosion and compression of fuel to high density and then laser produced protons penetrate in the compressed fuel and deposit their energy in it as the ignition hot spot is created. In this paper, following the energy gain of spherical target and considering relationship of the burn fraction to burn duration, we have obtained the energy gain of conical targets characterized by the angle β, and found a hemispherical capsule (β=π/2) has a gain as high as 96% of that of the whole spherical capsule. The results obtained in this study are qualitatively consistent with Atzeni et al.'s studies of simulations.
An Investigation into the Problems of Teaching and Learning English in the Isfahan Province High Schools, Iran
Omid Tabatabaei,Ali A. Pourakbari
Journal of Language Teaching and Research , 2012, DOI: 10.4304/jltr.3.1.102-111
Abstract: This study basically aimed at identifying the problems of teaching and learning English in the high schools of Isfahan, Iran. The data needed for the study were extracted from the standardized questionnaires given to 200 randomly selected students from the high schools of Isfahan and their English teachers constituting the two groups of participants in this study. The instruments used to gather the data were two closed questionnaires, one for the students and the other one for the teachers. The questions included in the questionnaires covered some major problems on the part of the students, teachers, textbooks, teaching methods, and the tests. To analyze the data and specify the problems, the chi-square test was applied. The test was performed to see if the differences among the proportions of the participants who chose different responses to the same questions were significant. Through the statistical analysis of the results, numerous problems regarding the teachers, the learners, the textbooks and the methods were revealed, such as: teachers do not use teaching aids during teaching, school libraries are not well equipped to be of service for the learners of English, classrooms are poor in terms of facilities and physical conditions, the teachers do not teach in English, the English textbooks are not suitable for the students’ level of proficiency, and the Ministry of Education does not honor the hard-working teachers, and many more. To remove the problems to the extent possible, some suggestions were provided.
CLINICAL EVALUATION OF EPIDURAL ADMINISTRATION OF MORPHINE, FENTANYL, METHADONE, LIDOCAINE AND LIDOCAINE WITH EPINEPHRINE IN CATTLE
A. Tabatabaei Naeine, A. Rezakhani and J. Fazlinia
Pakistan Veterinary Journal , 2004,
Abstract: The purpose of this study was to determine the analgesic efficacy and clinical effects of morphine, fentanyl, methadone, lidocaine, lidocaine with epinephrine and saline (control) when injected epidurally into the caudal epidural space in cattle. Epidural analgesia was achieved in five cattle on five successive occasions at weekly intervals. Analgesia was defined as a lack of response to hemostat pressure and pinprick in the skin of the perineal area and ventral aspect of the tail. The results demonstrated that while epidural lidocaine and lidocaine with epinephrine decreased the response to hemostat and pinprick compared to control, there was no reduction in response after the administration of morphine, methadone or fentanyl. Heart rate, pulse and respiratory rates were not significantly altered by any of the drugs. Neither did the drugs produce any change in the electrocardiogram (ECG) of the animals.
Nano-Catalytic Ozonation of 4-Nitrochlorobenzene in Aqueous Solutions
S. M. Tabatabaei,A. Mehrizad,P. Gharbani
Journal of Chemistry , 2012, DOI: 10.1155/2012/696418
Abstract: In this paper, efficiency of nano-ZnO particles on catalytic ozonation of 4-nitrochlorobenzene (4NCB) using semi-batch reactor has been studied at various pHs. During the catalytic ozonation, TOC and concentration of nitrate ions was monitored. Results indicate that degradation of 4NCB was improved by combination of nano-ZnO with ozone. The effect of ZnO particle size and pH are also examined. According to the results, concentration of 4NCB decreased with increasing of particle size from nanosized to microsized and pH from 3.0 to 9.0. Based on the results, it suggests radical hydroxyl does not affect on the degradation of 4NCB in catalytic ozonation, but the surface of catalyst plays main role. Kinetic studies showed degradation of 4NCB followed pseudo-first-order kinetic and maximum degradation rate was observed at pH=3.
The Correlation Between Mineral Concentration of Seminal Plasma and Spermatozoa Motility in Rooster
A. Aghaei,S. Tabatabaei,M. Nazari
Journal of Animal and Veterinary Advances , 2012, DOI: 10.3923/javaa.2010.1476.1478
Abstract: The aim of this study was to evaluate the correlation between cooper, zinc, calcium, sodium and potassium concentration of seminal plasma and spermatozoa progressive motility percent in rooster. Seventeen Indigenous broiler breeder Roosters were used. According to spermatozoa motility, roosters were classified to 3 treatment groups with low, medium and high progressive motility percent. Seminal plasma from all groups was obtained with centrifuge of semen samples. Cooper, Zinc, Sodium, potassium and calcium concentrations in seminal plasma samples were determined on the atomic absorption spectrophotometer. There was positive correlation between cooper and zinc concentrations of seminal plasma and progressive motility percent of spermatozoa. There was no significant correlation between sodium concentrations of seminal plasma and progressive motility percent of spermatozoa. There was negative correlation between low/medium progressive motility rate groups and high motility group. While this correlation for calcium concentration was positive.
Dietary Factors Associated To Obesity In Ahwaz Primary School Pupils
Dorosty A.R; Tabatabaei M
Tehran University Medical Journal , 2005,
Abstract: Background: Increase in obesity prevalence in recent years are associated to genetics as well environmental and behavioral factors. Change in dietary patterns including fatty and high density energy foods consumption have been reported to be very important. This study aimed to determine dietary factors (daily energy and macronutrient intakes, energy percentage of macronutrient, energy and macronutrient intakes per kilogram body weight, frequency of cola, natural fruit juice drinking, dairy products except cheese, tomato chips, puff, chocolate and fast food consumption and eating speed) associated to obesity in Ahwaz primary school pupils. Materials and Methods: Using two stage cluster sampling from 35 Ahwaz primary schools, all 10-11y students who had a BMI 95th percentile of Hosseini et al. (1999) reference, were identified as obese (n=150) and 150 same age and gender pupils (having BMI0.05). macronutrient intakes per kilogram body weight were significantly lower in obese group (p0.05). Obese students used to eat faster (p<0.05). Conclusion: In conclusion, high intakes of energy, protein, carbohydrate, tomato chips and puff and high eating speed were associated to obesity in Ahwaz primary school pupils.
Systemic Fungal Disease in Children
AA Rahbarimanesh,P Tabatabaei,A Zamani,AS Ghoreishi
Iranian Journal of Pediatrics , 2005,
Abstract: Background: Systemic fungal disease is related to administration of antibiotics, chemical therapy in malignancy, steroids therapy, etc in recent years. Methods: In a retrospective study from 1994 to 2004, we observed 26 patients. Findings: Most etiologic agents were Candida, Aspergillus, Mucormycosis and Cryptococcus. Predisposing factors in 80% of the patients were malignancy or chronic granulomatosis disease. Mortality occurred in 38% of patients. Conclusions: we recommend thinking to systemic fungal infections in high risk patients in order to diagnose and treat them properly.
Determination of the MIC of Antibiotics for Gram Negative Microorganisms Isolated from the Sterile Sites of Children Hospitalized in Rasool Akram Hospital
S Noorbakhsh,M Farhadi,A Tabatabaei
Iranian Journal of Pediatrics , 2006,
Abstract: Background: The increased prevalence of resistant gram negative organisms in our hospital is documented in our previous retrospective study during 1996-1998. The present study was conducted to determine the resistance frequency of gram negative organisms responsible for infection in children. Methods: In a descriptive prospective study within 2 years (2002-2003). We surveyed 101 children aged 1 month-14 years hospitalized in pediatric and ENT wards of Rasool Akram hospital selected by simple sampling. All gram negative organisms isolated from blood, CSF and other sterile sites (middle ear; mastoid; sinus; trachea) were evaluated first by disc diffusion and then E-testing for MIC to find appropriate antibiotics for the isolated organisms. Findings: The isolated germs consisted of Pseudomonas aeroginusa (47.5%), Klebsiella pneumoniae (22.8%); E. coli (17.8%), entrobacter and Acinetobacter (4.9%), Fusobacter and Salmonella paratyphi (1%). Resistance of pseudomonas was high (80%) for gentamycin; cotrimoxazole and rifampin; moderate (50%) for ceftazidim and amikacin, but low (<15%) for imipenem. Resistance of Klebsiella to ampicillin, gentamycin, amikacin, cotrimoxazole and ciprofloxacin was high (70%), but showed lower resistance for ceftriaxone and imipenem (30%). More than 90% of E. coli was resistant to ampicillin, cotrimoxazle, with moderate resistance (20%) to gentamycine and cephalexin. Resistance of Entrobacter to ceftriaxon was less than 40%. More than 80% of Acinetobacter was sensitive to amikacin and cotrimoxazole. Conclusion: Ceftazidime, despite increasing resistance of pseudomonas to it, combined with amikacin is still adequate for empiric treatment in admission. For other resistant types, cefepime or imipenem is useful. For Klebsiella pneumoniae, ceftriaxone and imipenem; for E. coli, amikacin or ceftriaxon; and if it does not respond imipenem or azteronam. Cefriaxon is the best choice for early treatment of Enterobacter infections.
PEDIATRIC HEAD INJURY
S.M. Tabatabaei,A. Seddighi
Iranian Journal of Child Neurology , 2007,
Abstract: Minor trauma to the head is common in childhood and does not require any medical or surgical treatment. Nevertheless, head injury in infancy and childhood is the single most common causeof death and permanent disability. Measurabledeficits occur even after mild to moderate head injury but aremarkedly greater after severe injury. They include impairedcognition, motor impairments, disruption of attention and informationprocessing, and psychiatric disturbances. Despite the frequency of the sequelae of head injury in childhood, there is relatively little information about the structuralbasis of the clinical deficits. Classical literature suggests that the immature brain and its coverings, at a time when it is rapidly acquiring new information, respond differently from the adult brain when subjected to an equivalent amount of mechanicalforce, whether mediated by contact or inertial loading. Identification of different patterns of injury in differentage groups has resonance in clinical practice and now providesa reference point for future clinical and neuropathologicalstudies. This work not only provides the basis for the futuremanagement of patients, but also serves to remind us of thecontinuing value of the autopsy and the proper examination of retained organs using modern standardized techniques.
INCISIONAL HERNIOPLASTY WITH MERSILEN MESH AND FULL AHDOMINOPLASTY
M HASHEMI,S.A. TABATABAEI
Journal of Research in Medical Sciences , 2003,
Abstract: ncisional Hernia is a complication after any abdominal incision. During 10 years we have done 25 incision Hernia repair by mersilen mesh and full abdominoplasty. The Hospital stay was 3-5 days, and has followed the patients for 3 months to 10 years. There was no recurrence, infection, fat emboli or other complication during this period. All the patients were satistitied frame their abdominal shape and surgical scar we advice this technique as an effective and simple method for repairing of incision hernia especially for recurrence.
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