نتایج جستجو برای: distribution of population

تعداد نتایج: 21240624  

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه اصفهان - دانشکده علوم 1389

this research concentrates on the lithostratigraphy, biostratigraphy, microfacies and sedimentary environment of the asmari and gachsaran formations at southwest firuzabad. the thickness of the studied section in all 608.95 meters that 220.8 meters belong to the asmari formation and 387.95 meters belong to the gachsaran formation (champe and mol members). in the study area, the asmari formation...

2005

The models of this paper attempt to account for the age, sex, and marital status distributions of human populations. A marriage market develops around preferences for mates of different ages, and we study this market as changes in age distributions change the availability of mates. Unless we know how to relate marriages to the exposed population, we cannot even calculate rates that will tell us...

2005
NATHAN KEYFITZ

The models of this paper attempt to account for the age, sex, and marital status distributions of human populations. A marriage market develops around preferences for mates of different ages, and we study this market as changes in age distributions change the availability of mates. Unless we know how to relate marriages to the exposed population, we cannot even calculate rates that will tell us...

1994
Barnali Gupta Debashis Pal Robert Drago Jonathan Hamilton John Heywood William Holahan

Recent work suggests that Cournot oligopolists competing in a spatial model, with a uniform distribution of consumers, agglomerate in the center of the market. In this paper we analyze the robustness of this result with a general symmetric distribution of consumers and show that if the population density is "too thin" at the center of the market, then Cournot competition does not yield spatial ...

2016

The attached study was discussed in the NRC 2006 review, but was criticized because the osteosarcoma rates of Kenyan provinces were not age-­‐adjusted. However, Kenyan provinces had large populations and it is unlikely there were large differences in ag distribution between provinces. Furthermore, the differences in osteosarcoma rates between provinces were as large as 400%. It is unlikely age ...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه پیام نور - دانشگاه پیام نور استان تهران - پژوهشکده علوم انسانی و اجتماعی 1390

چکیده: هدف: هدف از پژوهش حاضر مقایسه حافظه (کوتاه مدت، بلند مدت و بصری) در بیماران مبتلا به دیابت نوع 2 و افراد سالم می باشد. روش: روش پژوهش از نوع علی مقایسه ای است. جامعه آماری این تحقیق را کلیه بیماران مبتلا به دیابت نوع 2 ساکن شهرستان پارس آباد و روستاهای اطراف آن تشکیل می دهند. از بین این جامعه، 40 نفر از بیماران مراجعه کننده به پزشکان متخصصین داخلی و پزشکان خانواده که در شهرستان پارس آبا...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه صنعتی اصفهان - دانشکده ریاضی 1390

abstract: in the paper of black and scholes (1973) a closed form solution for the price of a european option is derived . as extension to the black and scholes model with constant volatility, option pricing model with time varying volatility have been suggested within the frame work of generalized autoregressive conditional heteroskedasticity (garch) . these processes can explain a number of em...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه صنعتی اصفهان - پژوهشکده برق و کامپیوتر 1389

نصب منابع پراکنده در سیستم های توزیع و فوق توزیع علاوه بر مزیت های فراوان، مشکلاتی را هم به همراه دارد. یکی از این مشکلات تأثیر این منابع روی اندازه جریان های اتصال کوتاه است. به طور معمول از حفاظت های مبتنی بر اصل جریان زیاد در سیستم های توزیع و فوق توزیع استفاده می شود. از مهمترین طرح های حفاظتی استفاده شده در فیدرهای توزیع، حفاظت فیوز- ریکلوزر است. همچنین از طرح های حفاظتی جریان زیاد جهتی در...

2010
Lyman L. McDonald G. P. Patil

I review weighted distribution theory and applications in observational studies where biased data arise. Recorded observations will be biased and not have the original distribution unless every observation is given an equal chance of being recorded. G. P. Patil and C. R. Rao in 1977 wrote “Although the situations that involve weighted distributions seem to occur frequently in various fields, th...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه علامه طباطبایی - دانشکده اقتصاد 1389

abstract: about 60% of total premium of insurance industry is pertained?to life policies in the world; while the life insurance total premium in iran is less than 6% of total premium in insurance industry in 2008 (sigma, no 3/2009). among the reasons that discourage the life insurance industry is the problem of adverse selection. adverse selection theory describes a situation where the inf...

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