نتایج جستجو برای: propagation

تعداد نتایج: 107452  

The mathematical modeling of the acoustic wave propagation in seawater is the basis for realizing goals such as, underwater communication, seabed mapping, advanced fishing, oil and gas exploration, marine meteorology, positioning and explore the unknown targets within the water. However, due to the existence of various physical phenomena in the water environment and the various conditions gover...

حمیداوغلی, سعید , حمیداوغلی, یوسف , طالعی, نگار , چمنی, اسماعیل,

Fritillaria imperialis is a mono-cotyledon plant from the Liliaceae family that grows wild in some parts of Iran. Fritillaria is a medicinal plant, in addition to being a beautiful flower. Due to the uncontrolled harvesting of flower and bulbs, Fritillaria survival is threatened in some areas in Iran. Fritillaria can be propagated by seed. In favorite condition. Its propagation by seed and prod...

Journal: :iranian journal of materials forming 2015
m. janghorban m. r. nami

in this paper, on the basis of a new strain gradient elasticity theory, wave propagation in rectangular nanoplates by considering in-plane magnetic field is studied. this strain gradient theory has two gradient parameters and has the ability to compare with the nonlocal elasticity theory. from the best knowledge of author, it is the first time that this theory is used for investigating wave pro...

Journal: :The Journal of the Acoustical Society of America 1986

Journal: :Journal of Artificial Intelligence Research 2019

In this paper, on the basis of a new strain gradient elasticity theory, wave propagation in rectangular nanoplates by considering in-plane magnetic field is studied. This strain gradient theory has two gradient parameters and has the ability to compare with the nonlocal elasticity theory. From the best knowledge of author, it is the first time that this theory is used for investigating wave pro...

Journal: :The Journal of the Acoustical Society of America 1965

Journal: :journal of sciences, islamic republic of iran 2011
p. davoudifar

cosmic rays (cr) travel at speeds essentially indistinguishable from the speed of light. however whilst travelling through magnetic fields, both regular and turbulent, they are delayed behind the light since they are usually charged particles and their paths are not linear. those delays can be so long that they are an impediment to correctly identifying sources which may be variable in time. fu...

حکیمی‌پژوه, حسین, روحانی, محمودرضا, کارگریان, آمنه,

In this paper with use of Particle in Cell (PIC) simulation method in one dimension the dynamic of ion acoustic soliton is studied. in this method the ions are monitored as particles and the electrons are assumed to be in thermal equilibrium. The dispersion relation of ion acoustic waves is investigated. The results are in good agreement with analytical results showing that in linear regime our...

Journal: :علوم باغبانی 0
محی الدین پیرخضری داراب حسنی اصغر سلیمانی

abstract persian walnut is one of the most important nut crops in iran. now the majority of orchards are seedling with a great diversity. for establishing uniform orchards and increasing the quantity and quality of yield, patch budding as the most suitable propagation methods, have still technical and practical problems in the country. in spite of high percent of primary success in patch buddin...

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