نتایج جستجو برای: mechanical properties of soil

تعداد نتایج: 21225030  

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...

Vegetation due to its root system by creating cohesion of soil particles, significantly affects hill slope mechanical properties related to shallow landslides and slope stability. In this regard, the root engineering characteristics of forest species are important. The aim of this study was to investigate the distribution pattern of persian oak and hawthorn in Zagross forests. For this purpose,...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه صنعتی امیرکبیر(پلی تکنیک تهران) - دانشکده مهندسی شیمی 1386

در سالهای اخیر نانوکامپوزیت ها به دلیل اثر نانوذرات موجود در آنها از طریق برهمکنشهای داخلی بر بهبود خواص در مقایسه با مواد دیگر مورد توجه قرار گرفته اند. نانوکامپوزیت های شامل پلیمر و سیلیکات های لایه ای گروه جدیدی از مواد هستند که خواص مکانیکی و عبورپذیری آنها بهبود یافته است. نانوکامپوزیت های پلیمر- خاک رس، که از دو فاز ماتریس پلیمری و عامل تقویت کننده تشکیل می شوند، به دلیل سهولت فرایند تولی...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه تبریز - دانشکده کشاورزی 1394

with the increasing population and the need for more food, as well as with the development of science and technology, human approach to unnatural and often chemical inputs to increase agricultural production has been a great expansion and problems such as increased cancers, chronic diseases has created environmental pollution. implementation of organic organic is a solution to these problems . ...

2005
FERNANDA COSTA

This research aimed to determine the soil seed bank and its relationship with environmental factors that have an influence in the distribution of the vegetation above the ground in an excluded area of natural grassland in the South of Brazil. Most of the 122 identified species in the seed bank were perennials. Data analysis indicated three distinct community groups, according to the size and co...

Journal: :journal of agricultural science and technology 2015
m. kasraei j. nejadi s. shafiei

physicochemical and mechanical properties of wheat grains can have a great impact on the quality of the final products (bread). therefore, correct selection of wheat cultivar for specific applications seems to be crucial. in this study, the differences in the physicochemical and mechanical properties (under compression and impact loadings) of ten iranian wheat cultivars (azar2, alamut, bam, bah...

F. Khayyer, M. Esmaeili M. Gharouni Nik

Construction of railway embankments on loose beds without using any methods of soil improvement (e.g. stone columns in silt and clay beds, deep soil mixing method, jet grouting and also using micropiles individually or in groups form) leads to  reduction of embankment slope gradient, which significantly increases the volume of soil operation. Generally, micropile as a reinforcing element with t...

ژورنال: مواد پرانرژی 2019

The mechanical properties of the final energetic composite depend mainly on the HTPB prepolymer microstructure; thus, the prepolymer microstructure of HTPB is one of the important factors influencing the mechanical properties of high-energy composite based on HTPB resin. In this paper, the effect of microstructure parameters of HTPB on the behavior and mechanical properties of its high-energy c...

Journal: :جنگل و فرآورده های چوب 0
منیره ایمانی دانش آموختۀ کارشناسی ارشد، دانشگاه علوم کشاورزی و منابع طبیعی گرگان، گرگان، ایران علی قاسمیان دانشیار، گروه صنایع خمیر و کاغذ، دانشگاه علوم کشاورزی و منابع طبیعی گرگان، دانشکدۀ مهندسی چوب و کاغذ، گرگان، ایران علیرضا شاکری دانشیار، دانشکدۀ شیمی، پردیس علوم، دانشگاه تهران، تهران، ایران ایمان اکبرپور دانشجوی دکتری، دانشگاه علوم کشاورزی و منابع طبیعی گرگان، دانشکدۀ مهندسی چوب و کاغذ، گرگان، ایران

in this research, old magazine (omg) recycled fiber and glass fiber (gf) were mixed at different levels of 10%, 20%, 30% and 40% (based on weight) with two levels of 50% and 60% polypropylene (pp) and then the produced composites evaluated compared to those from net polypropylene. on the basis of obtained results from normalization equations in different treatments done, two treatments has been...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه فردوسی مشهد - دانشکده علوم 1376

in chapter 1, charactrizations of fragmentability, which are obtained by namioka (37), ribarska (45) and kenderov-moors (32), are given. also the connection between fragmentability and its variants and other topics in banach spaces such as analytic space, the radone-nikodym property, differentiability of convex functions, kadec renorming are discussed. in chapter 2, we use game characterization...

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