نتایج جستجو برای: carbon resourse

تعداد نتایج: 281245  

Journal: :Ekonomìka prirodokoristuvannâ ì stalij rozvitok 2021

The article deals the analysis of production and consumption bioenergy resources in agriculture. It is established that assessment resource potential carried out with regard to following energy trilemma: decarbonization, security affordability, which significantly increases interest alternative fuels derived from renewable sources. In order achieve sustainable development context providing busi...

Journal: :international journal of advanced biological and biomedical research 2014
fatemeh madadian chaleshtory naser honarjoo ahmad jalalian

objective: soil organic carbon has been the most important soil quality measurement factors and has intense relation with soil physical, chemical and biological characteristics. organic matter and its components are important factors of soil aggregates constitution and stability and play significant role in its structure. so, this research has been done for achieving this purpose. methods: this...

Journal: :مرتع و آبخیزداری 0
محمد جعفری استاد، دانشکده منابع طبیعی، دانشگاه تهران، حسین آذرنیوند استاد، دانشکده منابع طبیعی، دانشگاه تهران احمد صادقی پور استادیار، دانشکده کویرشناسی، دانشگاه سمنان نادیا کمالی پور دکتری مرتعداری، دانشکده منابع طبیعی، دانشگاه تهران احمد حیدری دانشیار، دانشکده مهندسی و فناوری کشاورزی، دانشگاه تهران حسن مداح عارفی دانشیار، مؤسسه تحقیقات جنگل ها و مراتع

global warming and climate change have drawn special attention to soil and its potential for stable carbon sequestration. soils are the largest stores of carbon in terrestrial carbon cycle and contain about three times more carbon than vegetation cover and two times more than that of atmosphere. studying the effects of grazing on soil carbon storage is important because of the major role soil o...

Journal: :بوم شناسی کشاورزی 0
مریم السادات حسینی غلامحسین حق نیا امیر لکزیان حجت امامی

.soil microorganisms are important agents in nutrient cycling and energy flow. they are extremely sensitive to environmental changes. soil microbial biomass has been proposed as an index of soil stress and disturbance. the objective of this study was to determine the effects of barley (hordeum vulgare l.) residue amounts, burning, nitrogen fertilizer levels and tillage management on organic car...

Journal: :بوم شناسی کشاورزی 0
مهدی نصیری محلاتی علیرضا کوچکی حامد منصوری روح اله مرادی

evaluation of carbon input is one of the most important factors for estimating soil carbon changes and potential for carbon sequestration. to evaluate the net primary productivity (npp) and soil carbon input in agricultural eco-systems of iran, data for yield, cultivated area, harvest index (hi) and shoot /root ratio in different crops including: wheat, barley, maize, cotton, rice, alfalfa and ...

Journal: :journal of rangeland science 2011
m. mahdavi h. arzani m. mesdaghi kh. mahdavi j. mahmodi

since renaissance, the natural ecosystems have fallen into a complete state ofdisarray due to the rise in the amount of carbon dioxide. soil, the unsparing stuff, is one of themajor sources of carbon storage, and plays a paramount role in the global equilibrium ofcarbon as well as carbon sequestration. given that iran is benefiting from vast steppes, therate of carbon sequestration in them dese...

Journal: :journal of nanostructures 2012
m. oftadeh b. gholamalian m. hamadanian

the effective parameters of (5, 0) and (5, 5) single-wall carbon nanotubes during the interaction with carbon dioxide as sensors are determined. the interaction of carbon dioxide  molecules with internal and external walls of the nanotubes is studied using gaussian 03 coding by density functional theory (dft) at the b3lyp/6-311g level of theory. co2 rotation around tube axles vertically and par...

Journal: :journal of membrane science and research 0
w. n. w. salleh faculty of petroleum and renewable energy engineering, universiti teknologi malaysia, 81310 skudai, johor bahru, malaysia ahmad fauzi ismail advanced membrane technology research centre (amtec), universiti teknologi malaysia, 81310 skudai, johor bahru, malaysia

carbon membrane can be produced using a wide variety of polymer precursor materials via heat treatment process. a general concept route of precursor selection-preparation-modification-performance analysis platform for the carbon membrane has been proposed to promote the development of carbon membrane material for a wide range of application. the current review considers the recent progress of c...

Journal: :iranian journal of chemistry and chemical engineering (ijcce) 2010
j. li

ozone modification method and air-oxidation were used for the surface treatment of polyacrylonitrile(pan)-based carbon fiber. the surface characteristics of carbon fibers were characterized by x-ray photoelectron spectroscopy (xps). the interfacial properties of carbon fiber reinforced polyamide 6 (cf/pa6) composites were investigated by means of the single fiber pull-out tests. as a result, it...

Journal: :محیط زیست طبیعی 0
حمید جلیلوند دانشیار دانشگاه علوم کشاورزی و منابع طبیعی ساری زینب جعفریان دانشیار دانشگاه علوم کشاورزی و منابع طبیعی ساری مجید یوسفی کارشناس ارشد جنگل داری دانشگاه علوم کشاورزی و منابع طبیعی ساری

the aim of this study was to investigate the effect of reforestation on physical and chemical soil properties particularly soil carbon storage in the berenjastanak forest. forestations were including acer velotinum boiss., fraxinus excelsior l., populus nigra l. and pinus brutia ten. a witness forest with mixed species was selected as region potential. four soil profiles were drilled in each fo...

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