نتایج جستجو برای: di

تعداد نتایج: 255466  

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه الزهراء - دانشکده علوم پایه 1392

یکی از ﻣﻬﻤﺘﺮﯾﻦ ﻣﻮﻓﻘﯿﺖ ﻫﺎی ﻧﻈﺮﯾﻪ ﻧﺴﺒﯿﺖ ﻋﺎم در اواﯾﻞ ﻗﺮن ﺑﯿﺴﺘﻢ ﺗﻌﯿﯿﻦ دﻗﯿﻖ ﭘﯿﺸﺮوی ﺣﻀﯿﺾ ﺳﯿﺎره ﻋﻄﺎرد ﺑﻮد. رﺻﺪ ﻫﺎﯾﯽ ﮐﻪ در ﻗﺮن ﻧﻮزدﻫﻢ اﻧﺠﺎم ﺷﺪه ﺑﻮد ﻧﺸﺎن می داد ﮐﻪ ﭘﯿﺸﺮوی ﺣﻀﯿﺾ ﻋﻄﺎرد در ﺣﺪود 43 ﺛﺎﻧﯿﻪ ﻗﻮس ﺑﺮ ﻗﺮن از ﻣﻘﺪار ﻣﺤﺎﺳﺒﻪ ﺷﺪه ﺑﻪ کمک مکانیک نیوتونی ﺑﯿﺸﺘﺮ اﺳﺖ. اﺧﺘﻼف 43 ﺛﺎﻧﯿﻪ ﻗﻮس ﺑﯿﺶ از آن ﺑﻮد ﮐﻪ ناشی از ﺧﻄﺎی رﺻﺪ ﺑﺎﺷﺪ. اﺧﺘﺮ ﺷﻨﺎﺳﺎن ﻣﺪل ﻫﺎی مختلفی را ﺑﺮای ﺟﺒﺮان اﯾﻦ اﺧﺘﻼف ﭘﯿﺸﻨﻬﺎد ﮐﺮدﻧﺪ ﮐﻪ در ﻧﻬﺎﯾﺖ ﻧﺴﺒﯿﺖ...

2013

O cial development assistance (ODA) gross disbursements amounted to US$ 81.88 million on average per year channeling close to half of the disbursements into disaster prevention and preparedness and ood prevention and control (48.7 percent). Over the period 2002 to 2011, the Government of the Philippines’ water-related investments accounted for an estimated 3.0 percent of total government expend...

2013
Jisun Song

This study starts with the review on the role of external assistance to fragile states where the state lacks the capacity to provide better quality lives for its people. One of the tools being the Official Development Assistance, this paper focuses on the its disbursement patterns to fragile states that targets women's empowerment and gender equality to verify where donors stand on their action...

Journal: :نظریه تقریب و کاربرد های آن 0
m khanian department of mathematics, khorasgan (isfahan) branch, islamic azad university, isfahan, iran. a. davari department of mathematics, faculty of sciences, university of isfahan, isfahan, iran.

image restoration has been an active research area. di erent formulations are e ective in high qualityrecovery. partial di erential equations (pdes) have become an important tool in image processingand analysis. one of the earliest models based on pdes is perona-malik model that is a kindof anisotropic di usion (andi) lter. anisotropic di usion lter has become a valuable tool indi erent elds...

2014
Fabrizio Torre

Despite modern technology provide new tools to measure the world around us, we are quickly generating massive amounts of high-dimensional, spatialtemporal data. In this work, I deal with two types of datasets: one in which the spatial characteristics are relatively dynamic and the data are sampled at different periods of time, and the other where many dimensions prevail, although the spatial ch...

پایان نامه :دانشگاه تربیت معلم - تهران - دانشکده علوم انسانی 1391

چکیده خشکسالی یک پدیده طبیعی و تکرار شدنی است و در واقع بخش جدایی ناپذیری از نوسانات اقلیمی است که می تواند در هر منطقه جغرافیایی حادث شود. در این تحقیق داده های مربوط به بارش ماهانه و سالانه 17 ایستگاه در سطح سه استان همدان، قزوین و زنجان طی یک دوره آماری (1986 - 2010) جهت برآورد سال های خشک و مرطوب مورد استفاده قرار گرفته است. شاخص های خشکسالی به کار رفته در پژوهش حاضر شامل شاخص معیار بارش ...

A new facile route for synthesis of 3- (aryl) -8, 9- di (alkyl) thieno [3,2-e] [1,2,4] triazolo pyrimidines derivative from the same starting material, 2- amino - 4,5 -di (alkyl) thiophene-3- carboxamide, has been developed through heterocyclization of the corresponding arylidene-hydrazino -5,6 -di (alkyl) thieno [2,3-d] pyrimidine under refluxing condition with acetic anhydride followed by air...

Journal: :dental research journal 0
mahroo vojdani farideh bahrani parnian ghadiri

background: this study was designed to evaluate the correlation between subjective data obtained from a questionnaire and clinical examination among students in shiraz university of medical sciences. materials and methods: in this cross-sectional prospective study, the samples consisted of 200 subjects, with equal distribution between males and females. subjects’ ages ranged from 18 to 30 years...

Journal: :journal of mahani mathematical research center 0
esmail hesameddini department of mathematical sciences, shiraz university of technology, p. o. box 71555-313, shiraz, iran mahin azizi department of mathematical sciences, shiraz university of technology, p. o. box 71555-313, shiraz, iran

in this article, a mathematical model describing the growth orterminating myelogenous leukemia blood cancer's cells against naive t-celland e ective t-cell population of body, presented by fractional di erentialequations. we use this model to analyze the stability of the dynamics, whichoccur in the local interaction of e ector-immune cell and tumor cells. wewill also investigate the optima...

Journal: :international journal of occupational hygiene 0
mohamadreza monazzam department of occupational health engineering, school of public health, tehran university of medical sciences. farideh golbabaei department of occupational health engineering, school of public health, tehran university of edicalsciences,tehran, iran. rasoul hematjo department of occupational health engineering, faculty of health, bushehr university of medical sciences, bushehr , iran. mostafa hosseini department of epidemiology and biostatistics, school of public health, tehran university of medical sciences. parvin nassiri department of occupational health engineering, school of public health, tehran university of medical sciences. somayeh fahang-dehghan department of occupational health engineering, school of public health, tehran university of medical sciences, tehran, iran.

heat stress is a common occupational health hazard at outdoor workplaces especially in a hot-humid climate. overheating of the body can cause a number of problems, including heat rash, heat cramps, dizziness, heat exhaustion, and heat stroke. the present study aimed to assess heat stress indices including di, wbgt, and sw req /phs, as a mean to estimate the heat load on the employees of a petro...

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