نتایج جستجو برای: frequency

تعداد نتایج: 484143  

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه صنعتی امیرکبیر(پلی تکنیک تهران) - دانشکده مهندسی برق 1384

در این پروژه به منظور رسیدن به بهره انتقال صد در صد در سیستم ofdm ، سمبل های ارسالی بدون cp در نظر گرفته شده و به منظور حذف اثرات isi و ici ،جبران سازهای جدیدی در حوزه زمان و فرکانس در گیرنده طراحی شده اند . در سیستم هایofdm به صورت متداول از پیشوند گردشی با حداقل طول برابر با ماکزیمم تاخیر انتشار کانال به منظور حذف isi و ici استفاده می شود. هر چند این روش جبران سازی در گیرنده را آسان می کند ...

Journal: :international journal of hematology-oncology and stem cell research 0
andisheh ghashghaie hematology- oncology and stem cell transplantation research center, tehran university of medical sciences, dr. shariati hospital, tehran, iran kamran alimoghaddam hematology- oncology and stem cell transplantation research center, tehran university of medical sciences, dr. shariati hospital, tehran, iran mohammad reza ostadali hematology- oncology and stem cell transplantation research center, tehran university of medical sciences, dr. shariati hospital, tehran, iran hamid-o-allah ghaffari hematology- oncology and stem cell transplantation research center, tehran university of medical sciences, dr. shariati hospital, tehran, iran l khansari hematology- oncology and stem cell transplantation research center, tehran university of medical sciences, dr. shariati hospital, tehran, iran m sadraee hematology- oncology and stem cell transplantation research center, tehran university of medical sciences, dr. shariati hospital, tehran, iran

introduction: human leukocyte antigen (hla) genes are the most polymorphic loci in the human genome. they predict the outcome of transplantation by detecting self from non-self antigens. the best use of hla typing is to find a hla-match donor for bmt candidate patients. evidence suggests that matching unrelated donors and recipients for hla-a, -b and -drb1 loci is a prediction for an improved o...

Journal: :auditory and vestibular research 0
peyman zamani hearing and speech research center, ahvaz jundishapur university of medical sciences, ahvaz, iran masoud motasaddi zarandy otorhinolarygology research center, tehran university of medical sciences, tehran, iran pedram borghei otorhinolarygology research center, tehran university of medical sciences, tehran, iran hossein rezai musculoskeletal rehabilitation research center, ahvaz jundishapur university of medical sciences, ahvaz, iran farzad moubedshahi otorhinolarygology research center, tehran university of medical sciences, tehran, iran

background and aim: age implantation is one of the effective factors on speech production outcomes in cochlear implanted (ci) children. the purpose of this study is to determine the role of age implantation on formant frequencies and production of three persian vowels including /a/, /u/, /i/ in ci children. methods: sixty nine congenitally deaf children who received ci were divided into three g...

Journal: :international journal of preventive medicine 0
fatemeh mokhtari tayebeh panjehpour farahnaz fatemi naeini sayed mohsen hosseini mohammad ali nilforoushzadeh marzieh matin

background: alopecia areata (aa) is a noncicatricial (nonscarring) alopecia. the association between aa and celiac disease (cd) is debatable. several studies declare the relationship between aa and cd as measurement of celiac autoantibodies (anti‑gliadin iga and anti‑gliadin igg), but a few studies consider anti‑tissue transglutaminase iga. the aim of this study was to evaluate the frequency di...

Journal: :iranian journal of immunology 0
roghayeh rahimi tarbiat modares university, school of medical sciences ahmad zavaran hosseini tarbiat modares university, school of medical sciences fatemeh yari research center, iranian blood transfusion organization, tehran, iran

background: hla-g gene contains 15 alleles including a null allele, hla-g*0105n. previous studies have shown that hla-g*0105n does not encode the complete hla-g1 or hla-g5 isoforms but encodes a functional hla-g protein with the ability to in-hibit nk cell cytolysis. thus, although the biological functions of hla-g1 and hla-g5 proteins are abrogated, other isoforms such as hla-g2 can replace th...

Journal: :journal of research in medical sciences 0
mohammad javad tarrahi gastroenterohepatology research center, nemazee hospital, shiraz university of medical sciences/department of biostatistics, lorestan university of medical sciences davood mehrabani gastroenterohepatology research center, department of pathology, nemazee hospital, shiraz university of medical sciences farnaz khademolhosseini gastroenterohepatology research center, shiraz university of medical sciences masoud amini department of surgery, shiraz university of medical sciences seyed jalil masoumi gastroenterohepatology research center, nemazee hospital, shiraz university of medical sciences hasan julaee office of vice chancellor for health affairs, shiraz university of medical sciences

background: lung cancer is one of the fatal cancers in iran while 12% of the mortalities are related to this cancer in the country. this active hospital-based study was undertaken to determine the occurrence of lung cancer in fars province, southern iran. methods: data including face-to-face interview with patients and a survey of their medical and demographic records in relation to all invasiv...

Journal: :iranian journal of science and technology (sciences) 2006
m. sheidai

meiotic study was performed in 11 brassica napus cultivars considering chiasma frequency anddistribution, chromosome pairing, as well as the occurrence of b-chromosomes and their effects on chiasmafrequency. such cytogenetic pairing, along with agronomic characteristics, may be used in planninghybridization among the b. napus cultivars. all the cultivars studied possessed n=19 chromosome number...

Journal: :international journal of environmental research 0
d. eluk faculty of veterinary science, national university of litoral, kreder 2805, (3080) esperanza, argentine o. g. nagel faculty of veterinary science, national university of litoral, kreder 2805, (3080) esperanza, argentine j. zimmermann faculty of veterinary science, national university of litoral, kreder 2805, (3080) esperanza, argentine m. p. molina institute of animal science and technology, technical university of valencia, camino de vera s/n, (46072) valencia, spain r. l. althaus faculty of veterinary science, national university of litoral, kreder 2805, (3080) esperanza, argentine

for small cheese-making factories, with no effluent treatment plants, whey can be a serious problem and the landfarming technique represents an alternative for its disposal. however, whey may contain antibiotic residues at the maximum residue limits. therefore, in this work, we evaluated the phytotoxic effect of different concentrations of five antibiotics (enrofloxacin, kanamycin, oxytetracycl...

Journal: :iranian journal of electrical and electronic engineering 0
منیری moniri فرشاد farshad

power transformers are key components in electrical power supplies and their failure could cause severe consequences on continuity of service and also generates substantial costs. identifying problems at an early stage, before catastrophic failure occurs, is a great benefit for reliable operation of power transformers. frequency response analysis (fra) is a new, well-known and powerful diagnost...

Journal: :iranian journal of allergy, asthma and immunology 0
zahra kuroshli department of biology, science and research branch, islamic azad university, tehran, iran. hamid gourabi department of genetics at reproductive biomedicine research center, royan institute for reproductive biomedicine, acecr, tehran, iran. masoud bazrgar department of genetics at reproductive biomedicine research center, royan institute for reproductive biomedicine, acecr, tehran, iran. mohammad hossein sanati department of medical genetics, national institute of genetic engineering and biotechnology, tehran, iran. elmira bahraminejad department of genetics at reproductive biomedicine research center, royan institute for reproductive biomedicine, acecr, tehran, iran. khadije anisi department of genetics at reproductive biomedicine research center, royan institute for reproductive biomedicine, acecr, tehran, iran.

the human leukocyte antigen (hla)-g molecule is expressed in cytotrophoblast cells, adult thymic epithelial cells, erythroblasts, pancreatic islets and mesenchymal stem  cells. although, hla-g expression in allotransplanted patients is correlated with a better allograft acceptance, it is associated with an advanced grade of the tumor in cancer. in addition to the role on the immune system, hla-...

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