نتایج جستجو برای: lens

تعداد نتایج: 50659  

زکریایی, سید سلمان, صبا, ولی اله, ولی زاده, عبدالله,

Introduction: Eye lens is a very sensitive organ to the x-ray radiation and cataract could be formed as a result of eye exposure. Computed tomography (CT) is one of the main exposure sources in clinical situations and brain imaging delivers high amount of exposure to the eye lens. To reduce eye lens dose, efficient dose reduction methods have to be developed and implemented. In this paper, the ...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه صنعتی خواجه نصیرالدین طوسی - دانشکده برق و کامپیوتر 1393

آرایه فازی به منظور هدایت بیم در راستایی خاص نیازمند شبکه تغذیه ویژه ای می باشد. رتمن لنز به عنوان یکی از این ساختارهای تغذیه با قابلیت تحریک چند بیم در زوایای متفاوت در یک زمان، استفاده گسترده ای پیدا کرده است. در این پژوهش مهم ترین عوامل موثر بر پهنای باند این شبکه در ساختار مایکرواستریپ، که شبکه تطبیق امپدانس، رفتار انتشاری موج در بخش صفحات موازی و خطای فاز خطوط انتقال می باشند، بررسی شده و ...

Abbas Veshkini Alireza Vajhi, Farrokhreza Kabir, Majid Masoudifard, Mohammad Riyaziesfahani Voriya Touhidi

Objective- Assessment of the lens anterior – posterior (AP) diameter as compared with the eye globe by ultrasonography in rabbit.   Design- Descriptive study.   Animals- 120 male and female rabbits, two months to four years old, and weighting between 300 to 1500gr.   Procedures- 2D ultrasonography of the eyes was performed and AP diameter of the eyes and lens were measured using Sonosite Tit...

Ehsan , Masumeh Sharifi, Najmeh Nozhat,

Horn antennas can result in good impedance matching between the waveguide and free space due to the gradual increase in the aperture size. In this paper, a novel plasmonic sectoral horn nanoantenna based on using lens in the aperture is proposed. It is investigated that in addition to improvement of the directivity, the reflection coefficient is also reduced using the proper lens structure. The...

Journal: :بینا 0
محمدرضا جعفری نسب mr jafarinasab تهران- پاسداران- بوستان نهم- بیمارستان لبافی نژاد- مرکز تحقیقات چشم محمدعلی جوادی ma javadi تهران- پاسداران- بوستان نهم- بیمارستان لبافی نژاد- مرکز تحقیقات چشم امیر رضائی a rezaie تهران- پاسداران- بوستان نهم- بیمارستان لبافی نژاد- مرکز تحقیقات چشم کتایون جعفری k jafari تهران- پاسداران- بوستان نهم- بیمارستان لبافی نژاد- مرکز تحقیقات چشم زهرا ربانی خواه z rabbanikhah تهران- پاسداران- بوستان نهم- بیمارستان لبافی نژاد- مرکز تحقیقات چشم

purpose: to evaluate the prevalence of contat lens wear among highschool girls and their general knowledge about contact lenses and also to evaluate the specific knowledge of contact lens wearers about the lens. methods: in a cross-sectional study, 1664 students of 22 randomly selected girl highschools were enrolled. a questionaire including questions about wearing contact lens, age of first us...

Gh. Parhizgari M. Aminlari, S. Gholami S. Ranjbar

The purpose of this investigation was to study and compare the electrophoretic patterns of optic lensproteins of different species of domestic animals at pre- and post-natal ages. Optic lenses were removed from the embryo or adult sheep, cattle, goat, camel and chicken at the slaughter-house then homogenized and subjected to sodium dodecylsulfate polyacrylamide gel electrophoresis (SDS-PAGE). I...

Journal: :بینا 0
محمدحسین دهقان mh dehghan پاسداران- بوستان نهم- بیمارستان لبافی نژاد- مرکز تحقیقات چشم رضا سلیمانی زاد r soleimanzad پاسداران- بوستان نهم- بیمارستان لبافی نژاد- مرکز تحقیقات چشم حمید احمدیه h ahmadieh پاسداران- بوستان نهم- بیمارستان لبافی نژاد- مرکز تحقیقات چشم محسن آذرمینا m azarmina پاسداران- بوستان نهم- بیمارستان لبافی نژاد- مرکز تحقیقات چشم مسعود سهیلیان m soheilian پاسداران- بوستان نهم- بیمارستان لبافی نژاد- مرکز تحقیقات چشم سیامک مرادیان s moradian پاسداران- بوستان نهم- بیمارستان لبافی نژاد- مرکز تحقیقات چشم معصومه ثناگو

purpose: to evaluate the clinical manifestations and results of lensectomy in patients with hereditary lens subluxation at labbafinejad medical center, tehran-iran from 1996 t 2003. method: in an interventional case series, records of patients with hereditary lens subluxation who had undergone lensectomy were reviewed. patients with at least 6 months of follow up were included. background disea...

Journal: :research in cardiovascular medicine 0
ahmad bitarafan rajabi department of nuclear medicine, rajaie cardiovascular, medical and research center, iran university of medical sciences, tehran, ir iran feridoun noohi cardiovascular intervention research center, rajaie cardiovascular medical and research center, iran university of medical sciences, tehran, ir iran hassan hashemi noor ophthalmology research center, noor eye hospital, tehran, ir iran; noor ophthalmology research center, noor eye hospital, tehran, ir iran. tel: +98-2188651515, fax: +98-2188651514 majid haghjoo cardiac electrophysiology research center, rajaie cardiovascular medical and research center, iran university of medical sciences, tehran, ir iran mohammad miraftab noor ophthalmology research center, noor eye hospital, tehran, ir iran nahid yaghoobi department of nuclear medicine, rajaie cardiovascular, medical and research center, iran university of medical sciences, tehran, ir iran

results the electrophysiology laboratory staff received higher doses of ionizing radiation (17.2 ± 11.9 msv; p < 0.001). there was a significant positive correlation between the years of working experience and effective dose in the lens (p < 0.001). in general, our findings showed that the incidence of lens opacity was 79% (95% ci, 69.9-88.1) in participants with exposure (the case group) and o...

The present study examines the developmental stages of the eye retina in Caspian kutum during the pre-hatch stage to end of the larval stage. Fertilized eggs of Caspian kutum were obtained from Shahid Ansari Center for Reproduction of teleost fish (Guilan province, Iran). Sampling was done for one month until the larval stage completed and the yolk sac completely depleted. Samples were studied ...

Maleknia, Mahsa, Sahba, Sorina, Talaee Pour, Ahmad reza,

Evaluation of radiation absorption by thyroid gland and eye lens in trophy panoramic radiography Dr.AR. Talaee Pour *- Dr. S. Sahba ** - Dr. M. Maleknia***. *- Associate professor of Oral & Maxillofacial radiology Dept.- Faculty of Dentistry - Tehran University of Medical Sciences. ** - Associate professor of Oral Diseases and Diagnosis.- Faculty of Dentistry - Shaheed Beheshti University of Me...

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