نتایج جستجو برای: characteristics length

تعداد نتایج: 944901  

Journal: :مرتع و آبخیزداری 0
غلامعلی حشمتی دانشکده مرتع و آبخیزداری، دانشگاه علوم کشاورزی و منابع طبیعی گرگان، ایران مژگان سادات عظیمی دانشجوی دکتری علوم مرتع، دانشکده مرتع و آبخیزداری، دانشگاه علوم کشاورزی و منابع طبیعی گرگان، ایران پروانه عشوری کارشناس ارشد موسسه تحقیقات جنگل ها و مراتع کشور، ایران

rangeland ecosystem contains various patches with different functions. structural and functional characteristics of rangeland patches are changed by management practices and can be used to interpret management effects. the structural and functional characteristics of fertilized patches in two rangeland ecosystems of ghareh ghir and maraveh tapeh were measured and analyzed in this study. a group...

Journal: :علوم دامی ایران 0
حمیدرضا انصاری رنانی دانشیار، موسسه تحقیقات علوم دامی کشور حمیدرضا باقرشاه دانش آموخته کارشناسی ارشد پردیس کشاورزی و منابع طبیعی کرج دانشگاه تهران سپهر مرادی دانشجوی کارشناسی ارشد گروه علوم دامی دانشگاه زنجان سیدمجتبی سیدمومن عضو هیئت علمی مرکز تحقیقات کشاورزی و منابع طبیعی کرمان

this research was conducted to compare fiber and follicle characteristics of chios, arkhamerino×moghani, and suffolk×moghani sheep. forty non-lactating ewes (16 heads of chios, 12 head arkhamerino×moghani, and 12 heads of suffolk×moghani) at the age of 22 months were randomly selected and kept for a period of 50 days. at the end of the experimental period, 50 grams of wool was collected from le...

علیرضا زارعی, , احمد ابریشم‌چی, , سیدسعید اسلامیان, ,

An approach for regional low flow frequency analysis is to use multiple regression techniques for obtaining relationships between low flows with specific return periods and catchments characteristics. In this paper, this method has been used. After single-site frequency analysis for 20 stream gauging stations, homogeneity test was performed. Regional relationships between low flows with return ...

ژورنال: علوم آب و خاک 2004
علیرضا زارعی, , احمد ابریشم‌چی, , سیدسعید اسلامیان, ,

An approach for regional low flow frequency analysis is to use multiple regression techniques for obtaining relationships between low flows with specific return periods and catchments characteristics. In this paper, this method has been used. After single-site frequency analysis for 20 stream gauging stations, homogeneity test was performed. Regional relationships between low flows with return ...

Japoshvili, B., Mumladze, L., Murvanidze, L.,

Gibel carp is a very successful invasive fish species in the waters of Georgian inland and the only fish species in Lake Madatapa. However, almost nothing is known about its biology and morpho-ecological peculiarities at the national level and even the distribution data is not documented. For the first time, we studied the population characteristics of gibel carp in Lake Madatapa (South Georgia...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه شیخ بهایی - دانشکده زبانهای خارجی 1391

simplification universal as a universal feature of translation means translated texts tend to use simpler language than original texts in the same language and it can be critically investigated through common concepts: type/token ratio, lexical density, and mean sentence length. although steps have been taken to test this hypothesis in various text types in different linguistic communities, in ...

Plant roots, with respect to their intrinsic characteristics, have important role in both improvement and development of germplasms of drought resistant plants. This experiment was conducted to study direct and indirect effects of root morphological traits on grain yield of four triticale genotypes (three promising lines of ET-82-8, ET-82-15 and ET-79-17 along with the conventional Junillo-92...

Enlarged root systems that extend into the salt affected soil improve water and nutrient capture by plants and can increase plant productivity. In order to examine root system characteristics of four bread wheat cultivars contrasting in salt tolerance (Arg, Ofoq, Tajan and Morvarid) a greenhouse experiment was conducted with applying two salinity levels (0 and 150 mM NaCl) on plants grown in PV...

Journal: :Water 2022

Hydraulic pipeline transportation of a piped vehicle is new mode with energy-saving potential and environmental protection. In order to analyze the turbulent characteristics flow around vehicle, large eddy simulation (LES) method was adopted simulate hydraulic vortex at Reynolds number Re = 140,467 diameter-to-length ratios 0.4, 0.5, 0.6, 0.7. The results showed that main factor affected gap ve...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه تربیت مدرس - دانشکده منابع طبیعی 1391

in this study, the effects of oleothermal modification on physical and mechanical peroperties of fir wood (abeis sp.) blocks were examined. at first, some blocks of fir wood with 5 × 20 × 120 cm dimensions were prepared. the blocks were treated in soybean oil. the effects of 3 factors such as treatments temperature (180and 200 °c), holding time (12 and 15 h) and initial moisture content of wood...

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