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Search Results: 1 - 10 of 698 matches for " Samira Ehsani "
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Modeling Repairable System Failures with Repair Effect and Time Dependent Covariates
Jayanthi Arasan,Samira Ehsani
IAENG International Journal of Applied Mathematics , 2011,
Economic Geology Study with Focus on Cu Mineralization (Fath Abad Area, Khorasan Razavi)  [PDF]
Reza Ehsani, Naghmeh Mohamadi, Mohamd Hossain Ehsani
Journal of Geoscience and Environment Protection (GEP) , 2016, DOI: 10.4236/gep.2016.410001
Abstract: The study area is located in south of Khorasan-Razavi province. This region is part of central Iran, which is of high significance due to existence of metal and non-metal deposits. Considering the location of the study area, the lithology and metal-mineral indices of Dolat-Abad sheet, it can be said that their metallic deposits are economically feasible. Hence, this region is considered promising for exploration of metallic deposits. In order to achieve this goal, at first, the region’s alterations were detected by using OLI-ASTER images in ENVI software. After processing the lithogeochemical data in SPSS and GIS software, anomaly map of studied elements was obtained. Using geological map, different layers such as lithology, faults and indices were obtained. Eventually, by preparing the layers and incorporating those using the index overlay GIS modeling, promising mineralization areas in the region were identified. Results show that a significant Cu-Au mineralization has occurred in the south western region of the study area.
Study on the Effect of Preparation Parameters of K2CO3/Al2O3 Sorbent on CO2 Capture Capacity at Flue Gas Operating Conditions  [PDF]
Javad Esmaili, Mohammad Reza Ehsani
Journal of Encapsulation and Adsorption Sciences (JEAS) , 2013, DOI: 10.4236/jeas.2013.32007
Abstract: In this paper, study on the effect of preparation conditions of K2CO3/Al2O3 sorbent was done. Box-Behnken design was applied to study the influence of four parameters involve initial solution concentration, impregnation time and calcination step temperature and time. A quadratic model was used to correlate the sorbent capture capacity. The model was used to calculate the optimum conditions for preparing sorbent. From the analysis of variance (ANOVA), the most influential factor on each experimental design response was identified. The potassium-based sorbents used in this study were prepared by impregnating K2CO3 on Al2O3 support. The CO2 capture capacity was measured in the presence of H2O in a fixed-bed reactor at CO2 capture temperature of 60°C using breakthrough curves. The optimum sorbent prepared by this method showed CO2 capture capacity of 77.21 mg CO2/g sorbent. It was observed that the experimental values obtained were in good agreement with the values predicted by the model, with relatively small errors between the predicted and the actual values. The results obtained in this study can be used as basic data for study on design and operating condition optimization of CO2 capture process using these sorbents.
Congenital Choledochal Cyst
H Ehsani
Iranian Journal of Pediatrics , 1985,
Abstract: 2 patients, a 6-year old male with a history of fever and diarrhea and clinical findings of paleness and abdominal tumor, and a 15-month old female with jaundice, abdominal tumor, hematemesis and melena, are presented. In both of them laboratory findings showed a biliary occlusion. Imaging methods revealed a cystic tumor in the region of the gall bladder. The children underwent a laboratory, which revealed a choledochal cyst. A cystoduodenostomy was performed and the patients recovered from their symptoms. This case presentation is followed by a brief discussion on etiology, clinical signs and diagnostic methods of the malformation.
Convulsions Caused by Pseudohypoparathyroidism
H Ehsani
Iranian Journal of Pediatrics , 1990,
Abstract: A 12-year-old girl was suffering of convulsions since 2 years of age and was being treated with anti-epileptic drugs without any effect. Evaluation of the disease revealed Pseudohypoparathyroidism as the cause of convulsions. Pseudohypoparathyroidism is a rare, hereditary disease, inherited as an X-linked dominant trait. The clinical and radiologic signs are conspicuous. Thyroid hormone secretion is normal. Calcium levels in blood serum are decreased and phosphorus increased. Parathormone has no effect on serum calcium levels or urinary CAMP secretion. Associated hormone disturbances in some reports suggest Pseudohypoparathyroidism as a generalized endocrinopathy. Vitamin D or calcitriol administration normalizes serum calcium levels and the convulsions subside thereof
Absence Seizures
H Ehsani
Iranian Journal of Pediatrics , 1986,
Abstract: Presenting two patients with typical absence seizures this paper discusses the clinical features, diagnostic tests and therapeutic possibilities of the disease. Absence seizures may have various clinical pictures. Early recognition and treatment may prevent avoidable complications and sequelae. Otherwise the prognostic outcome is poor. In addition to clinical observation, EEG is the most helpful diagnostic means. This shows characteristic changes especially under stimulation by hyperventilation. Ethosuximide is the drug of choice in the therapy of absence seizures, which causes the clinical symptoms as well as EEG changes to disappear.
Febrile Convulsion
H Ehsani
Iranian Journal of Pediatrics , 1986,
Abstract: Febrile convulsions occur relatively frequently in children, the age of onset being 6 months to 5 years. The diagnosis is based on the character of the convulsion, its frequency, length of the seizure, results of lumbar puncture and EEG. These convulsions have a good prognosis. Therapy consists in medical disruption of the convulsion and appropriate treatment of the fever.
Migraine in Children
H Ehsani
Iranian Journal of Pediatrics , 1985,
Abstract: Headache is a symptom in many pediatric diseases. Migraine is one of these disorders that, although not very frequent in pediatric age group, is worth considering. Migraine has three different clinical manifestations, i.e., classical simple and complicated form. Etiological factors such as heredity, hormonal disturbances or food allergies are discussed. Before deciding for this diagnosis other possible causes of headache should be evaluated and ruled out. The initial treatment consists in administration of usual analgesics such as aspirin. If unresponsive, more potent drugs such as alkaloids, caffeine or pethidine can be used. For prophylaxis ergotamine or dihydroergotamine, at least for three months, is administered. Prognosis depends on the type of Migraine, but is generally not bad.
Detection of the YMDD Motif Mutations Rate in Chronic Hepatitis B Patients Treated with Lamivudine
R Ehsani
Qom University of Medical Sciences Journal , 2012,
Abstract: Background and Objectives: Lamivudine is the first nucleoside analogue licensed for the treatment of chronic hepatitis B patients which is effective in suppressing virus replication and results in reduced disease activity. However the most important problem of lamivudine treatment is the emergence of lamivudine resistance strains with amino acid substitution in the YMDD motif of the DNA polymerase during the treatment. The aim of this study was to evaluate the frequency of YMDD motif mutations in chronic hepatitis B patients treated with lamivudine. Methods: 56 chronic hepatitis B patients who had not previously received interferon and/or a nucleoside/nucleotide analogue, received lamivudine for a minimum of 6 months were examined in this study. HBV DNA was extracted from serum samples, and YMDD mutations in the HBV DNA polymerase gene was determined using PCR-direct sequencing. HBV DNA quantification was determined using real-time PCR. Results: 56 patients 39 (69.6%) male and 17 (30.4%) female with mean age of 34.12±) 13.6 (were evaluated. YMDD motif mutations were observed in 15 out of 56 patients (26.7%). 8 of these mutations (14.2%) were in the form of YIDD and the remaining 7 (12.5%) in YVDD form. Serine mutation at YMDD motif was not found in this study. Conclusion: YMDD motif mutations leading to lamivudine resistance is common in our chronic hepatitis B patients. Molecular diagnosis of YMDD motif mutations using methods such as direct DNA sequencing can detect upcoming viral resistance in chronic hepatitis B patients.
On Regular Co-Medial Algebras
Amir Ehsani
Journal of Mathematics Research , 2012, DOI: 10.5539/jmr.v4n2p101
Abstract: In this paper we define the concepts of co-medial algebra and regular algebra and we will show that for a regular co-medial algebra $(A,f,g)$, there exist a commutative semigroup $(A,+)$, such that the operations $f,g$ have the linear representation on $(A,+)$. As a consequence of above result, we have the linear representation of an $n-$ary medial groupoid with an regular element, which was obtained by (Evans, T., 1963, p. 331-349).
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