نتایج جستجو برای: energy

تعداد نتایج: 666269  

Journal: :اقتصاد و توسعه کشاورزی 0
سیدنعمت الله موسوی ذکریا فرج زاده فرزانه طاهری

energy is considered as an important input for agricultural products. a decrease in energy subsidy and its demand reduces agricultural outputs and raises the production costs. changes in production and costs may significantly affect welfare of the agricultural producers. the main objective of this study was to analyze the impact of increased energy prices (reduction in the subsidy) on the agric...

Journal: :تحقیقات اقتصادی 0
حسن درگاهی دانشیار دانشکدۀ علوم اقتصادی و سیاسی، دانشگاه شهید بهشتی کاظم بیابانی خامنه کارشناس ارشد اقتصاد انرژی، دانشگاه شهید بهشتی

the main goal of this study is to identify the determinants of the energy intensity in the iranian economy using annual data for the period 1974-2012. changes in energy intensity can be seen as related to three factors including price, income, and autonomous energy efficiency improvements (based on technical progress). moreover the role of energy quality in enhancement of total factor productiv...

Journal: :به زراعی کشاورزی 0
عارفه رزازی دانشجوی دکتری، گروه زراعت، دانشکدة کشاورزی، دانشگاه تربیت مدرس، تهران - ایران مجید آقاعلیخانی دانشیار، گروه زراعت، دانشکدة کشاورزی، دانشگاه تربیت مدرس، تهران - ایران برات قبادیان دانشیار، گروه مهندسی مکانیک بیوسیستم، دانشکدة کشاورزی، دانشگاه تربیت مدرس، تهران - ایران بهنام زند استادیار پژوهش، بخش تحقیقات زراعی و باغی، مرکز تحقیقات کشاورزی و منابع طبیعی استان تهران، ورامین - ایران سید محمد صفی الدین اردبیلی دانشجوی دکتری، گروه مهندسی مکانیک بیوسیستم، دانشکدة کشاورزی، دانشگاه تربیت مدرس، تهران - ایران

castor bean (ricinus communis l.( with a capability to withstand harsh conditions, low nutritional needs, 50 percent of oil content and high- quality, is one of the best crop used to produce biodiesel. the first step toward introduction and widespread cultivation of this crop is to investigate the energy balance for its cultivation. to do so, energy input (include renewable and nonrenewable) an...

Journal: :international journal of preventive medicine 0
sanaz mehrabani amin salehi-abargouei mehdi asemi sepideh mehrabani awat feizi seyyed morteza safavi

background: appetite lowering characteristics of dairy have attracted scientists to look for its effect on energy intake particularly among children. in the present study, we tried to assess the effect of low-fat milk on total and short-term energy intake among obese boys in a randomized three-way cross-over clinical trial. methods: a total of 34 obese 10-12-year-old boys were randomized to con...

Journal: :تحقیقات اقتصادی 0
سعید صمدی دانشگاه اصفهان علیمراد شریفی دانشگاه اصفهان عزیز احمدزاده آزاد خانزادی

one of the most important issues about production structure and measurement of factors utilization in industry is the study of substitutability among the production factors. while, energy, for its particular features like finite and the direct relationship between energy usage and air pollution; and specifically abundance of energy resources and allocation of subsidies to different energy carri...

The building sector accumulates approximately a third of the final energy consumption. Consequently, the improvement of the energy efficiency in buildings has become an essential instrument in the energy policies to ensure the energy supply in the mid to long term moreover is the most cost-effective strategy available for reducing carbon dioxide emissions This paper is studying the main objecti...

Journal: :مطالعات اوراسیای مرکزی 0
صادق زیباکلام عضو هیات علمی نیمه وقت، دانشگاه آزاد اسلامی، واحد علوم و تحقیقات، گروه علوم سیاسی و روابط بین الملل، تهران، ایران مهناز گودرزی دانشجو دکترا روابط بین الملل، دانشگاه آزاد اسلامی، واحد علوم و تحقیقات، گروه علوم سیاسی و روابط بین الملل، تهران، ایران

although on the basis of geo-economic theories, study of energy-related issues is of strategic importance to all countries, energy resources are no more restricted to oil and gas reserves as was the case during the past century. of course, these resources are still key elements of global energy reserves. today, in addition to geo-politics and geo-economics, the concept of hydro-geopolitics puts...

Journal: :پژوهش های علوم دامی ایران 0
حیدر زرقی ابوالقاسم گلیان حسن کرمانشاهی حسن عاقل

one hundred twenty male broiler chickens of 20 d of age were used to study the effect of enzyme supplementation on the apparent metabolisable energy corrected for nitrogen in corn, wheat and triticale using total excreta collection or marker methods. the average apparent metabolisable energy corrected for nitrogen in corn, wheat and triticale on dry matter basis, were 3480 ±90, 3263 ±61 and 326...

Journal: :energy equipment and systems 2014
morteza gholipour khajeh masoud iranmanesh farshid keynia

industrial energy consumption lies between 30% and 70% of the total energy consumed in selected countries. cement production is one of the most energy intensive industries all around the world. this paper deals with an energy audit analysis in a cement plant in iran. in all recent works, after performing an energy audit, different strategies are offered to reduce energy losses. generally, these...

Journal: :poultry science journal 2013
khan sa chaudhry hr butt ys jameel t ahmad f

from the last few years, the inclusion of microbial phytase in poultry diets has increased significantly, mainly in response to heightened concerns over phosphorus pollution of the environment and as cheaper means to make phosphorus available to birds from phytate. phytate is the major form of phosphorus, abundantly found in cereal grains, beans and oilseed meals used in poultry diet but the mo...

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