نتایج جستجو برای: cross efficiecny

تعداد نتایج: 490224  

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه صنعتی خواجه نصیرالدین طوسی - دانشکده برق 1389

بهینه سازی پیکربندی سیستم های مخابراتی، نیازمند داشتن دانش عمیقی از عملکرد و تنظیمات فرستنده و گیرنده می باشد. عملکرد سیستم های مخابراتی، توسط پارامترهای مختلفی از لایه های شبکه ای آن توصیف می شود. در این پژوهش پارامترهای کیفی تعیین کننده ی کارآیی سیستم dvb-t، در لایه-های شبکه ای آن معرفی شده و روابط مربوط به نحوه ی اندازه گیری آنها، مورد بررسی قرار گرفته است. این پارامترها در لایه های فیزیکی، ...

پایان نامه :دانشگاه آزاد اسلامی - دانشگاه آزاد اسلامی واحد قزوین - دانشکده دندانپزشکی 1388

چکیده ندارد.

پایان نامه :دانشگاه تربیت معلم - تهران - دانشکده ادبیات و زبانهای خارجی 1384

چکیده ندارد.

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه محقق اردبیلی - دانشکده علوم پایه 1390

در این پایان نامه بعد از ارائه مقدمه و تاریخچه امضای الکترونیک و روشهای آن، در فصل دوم تعاریف و اصول کلی امضای دیجیتال که یکی از انواع امضای الکترونیک است و همچنین آشوب و ویژگیهای آن و ارتباط بین امضای دیجیتال و آشوب مورد بحث قرار خواهد گرفت. در ادامه یک نگاشت آشوبناک به نام نگاشت آشوبناک کوپل شده معرفی شده است. در فصل سوم تولید و جاسازی اثرانگشت دیجیتالی در عکس دیجیتالی بر اساس نگاشت آشوبناک ک...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه تربیت مدرس - دانشکده فنی مهندسی 1385

acknowledge the importance of e-commerce to their countries and to survival of their businesses and in creating and encouraging an atmosphere for the wide adoption and success of e-commerce in the long term. the investment for implementing e-commerce in the public sector is one of the areas which is focused in government‘s action plan for cross-disciplinary it development and e-readiness in go...

Journal: :روش‏ شناسی علوم انسانی 0
. احمدی صدری .

. cross-cultural understanding dates back to the discovery of the third world, its peoples, and its religions. along this, the place of studying other peoples came in view. demography and orientalism were two disciplines which first aimed at studying other peoples regardless of their beliefs. after some thirty years, emphasis was laid on their beliefs, too. today after disproof of the anticipat...

Journal: :ecopersia 0
ommolbanin bazrafshan assistant professor, department of range and watershed management, university of hormozgan, bandar abbas, iran farzad parandin former master student, department of range and watershed management, university of hormozgan, bandar abbas, iran behnoush farokhzadeh assistant professor, department of range and watershed management, malayer university, malayer, iran

the impact of meteorological and hydrological drought on groundwater resources in coastal deserts in the south of iran was investigated during 1991-2011, using standardized precipitation index (spi), standardized runoff index (sri), and groundwater resources index (gri). the results indicated that wet and drought spells governed the area in the first and second decades, respectively, which was ...

Journal: :journal of arthropod-borne diseases 0
suhandanadigüzel van-zoelen netherlands organisation for applied scientific research-innovation for life-hollanda, turkey. ozcan ozkan drug and medical device agency of turkey, ankara, turkey. bora inceoglu department of entomology, university of california, davis, usa.

background : antivenom is still widely used in the treatment of envenomation as there are no vaccines or other effective agents available against animal venoms. recently, neurotoxins named birtoxin family have been described from parabuthus transvaalicus and androctonus crassicauda. the aim of the present study was to test the antibirtoxin antibodies for their ability to neutralize the lethal e...

Journal: :iranian journal of allergy, asthma and immunology 0
maría morales-suarez-varela unit of public health, hygiene, and environmental care, department of preventive medicine, universit agustín llopis-gonzález research group ciber cb06/02/0045, ciber actions - epidemiology and public health, valencia, spain natalia gimeno-clemente unit of public health, hygiene, and environmental care, department of preventive medicine, universit mª cristina jiménez-lópez unit of public health, hygiene, and environmental care, department of preventive medicine, universit luís garcía-marcos álvarez unit of clinical research, cartagena, spain

a study was done about non-participation during phase iii of the international study of asthma and allergy in childhood (isaac iii) in valencia to determine whether the non-response rate significantly affected the results obtained in valencia. of the schools selected to participate in isaac iii, 13.3% denied not to, the main reason being they were already participated in a similar study. the is...

Journal: :iranian journal of public health 0
hassan hashemi noor ophthalmology research center, noor eye hospital, tehran, iran. farhad rezvan noor ophthalmology research center, noor eye hospital, tehran, iran. abbasali yekta dept. of optometry, school of paramedical sciences, mashhad university of medical sciences, mashhad, iran. hadi ostadimoghaddam refractive errors research center, school of paramedical sciences, mashhad university of medical sciences, mashhad, iran. sara soroush noor ophthalmology research center, noor eye hospital, tehran, iran. nooshin dadbin noor ophthalmology research center, noor eye hospital, tehran, iran.

background : visual impairment is a very important public health problem. in iran, reports of visual impairment and blindness have been published from the urban population while the prevalence of visual impairment in the rural popu-lation has not been reported. the purpose of this study to determine the prevalence and causes of visual impairment, in a rural population in district of based on ag...

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