نتایج جستجو برای: magnetic tunn

تعداد نتایج: 338575  

Journal: :فیزیک زمین و فضا 0
بهروز اسکویی استادیار، گروه فیزیک زمین، مؤسسة ژئوفیزیک دانشگاه تهران، ایران علی کریمی کلایه دانشجوی کارشناسی ارشد ژئومغناطیس، گروه فیزیک زمین، مؤسسة ژئوفیزیک دانشگاه تهران، ایران وحید ابراهیم زاده اردستانی دانشیار، گروه فیزیک زمین، مؤسسة ژئوفیزیک دانشگاه تهران و قطب علمی مهندسی نقشه برداری و مقابله با سوانح طبیعی، تهران، ایران

the analytic signal method is usually used to interpret the magnetic and gravity anomalies. the main advantage of using analytic signal method in interpretation of magnetic source parameters from magnetic anomalies is that the amplitude dip of the analytic signal is independent of directional parameters like magnetization and the dip of the source. using the coefficient of the amplitude to esti...

Magnetic shape memory properties of Ni-Mn-Ga single crystals were characterized by measurement of stress-induced martensite reorientation under constant magnetic fields. Also magnetic field-induced strain as a function of the applied magnetic field under different constant compressive stress levels has been investigated. All the experiments were performed at room temperature in which the sample...

Journal: :فیزیک زمین و فضا 0
کمال علمدار دانشجوی دکتری اکتشاف معدن، دانشکده مهندسی معدن، نفت و ژئوفیزیک، دانشگاه صنعتی شاهرود عبدالحمید انصاری عضو هیئت علمی، دانشکده مهندسی معدن و متالورژی، دانشگاه یزد

mapping the edges of magnetized bodies is fundamental to the application of magnetic data to geologic mapping. whether as a guide for subsequent field mapping or as a predictive mapping tool in areas of limited exposure, delineating lateral magnetization changes provides information on not only lithological changes but also on structural regimes and deformation styles and trends. adding contact...

In a strapdown magnetic compass, heading angle is estimated using the Earth's magnetic field measured by Three-Axis Magnetometers (TAM). However, due to several inevitable errors in the magnetic system, such as sensitivity errors, non-orthogonal and misalignment errors, hard iron and soft iron errors, measurement noises and local magnetic fields, there are large error between the magnetometers'...

سیدجواد هاشمی‌فر, , صدیقه سیروسی, , ناهید قادری, , هادی اکبرزاده, ,

  The incommensurate spin -density –wave magnetism of Cr has attracted great interest since its discovery via neutron scattering. Although the existence of spin- density –wave has been confirmed by experiment but the calculations which have been carried out have not been able to predict the correct ground state magnetic phase for chromium yet. To predict the magnetic hyperfine field at nucleus ...

Journal: :international journal of environmental research 2011
k. sandeep a.k. warrier b.g. harshavardhana r. shankar

iron oxide minerals in soils provide valuable insights into pedogenic processes. a wealth of such information has been obtained by rock magnetic investigations on temperate soils but similar studies on tropical soils are rare. here, we report rock magnetic data on pristine soil profiles and surficial soils from five catchments in the tropical southern india and throw light on the pedogenic pro...

Journal: :پژوهش های حبوبات ایران 0
قدریه محمودی علی قنبری مهدی راستگو مصطفی قلی زاده ایرج طهماسبی

introduction proteins are one of the basic and essential required compounds for life, and the creatures receive it either from a plant or animal origin. it has been reported that the positive effects caused by applying the magnetic field are due to the paramagnetic properties of the cells within the plant, and pigments such as the chloroplast. biophysical methods (magnetic fields, electricity, ...

We have investigated the magnetic properties of three-dimensional topological insulators, doped with magnetic atoms. The spin-orbit locking of surface electrons results in interesting magnetic behaviors, absent in conventional insulators without spin-orbit coupling. In particular, the ferromagnetic-paramagnetic transition temperature has a strong dependence on different system parameters. Here,...

Journal: :مکانیک سیالات و آیرودینامیک 0
اکرم صدیق رضا ابراهیمی

in this research ideal magnetohydrodynamics equations (mhd) has been solved in a channel of quasi one dimensional plasma flow. magnetohydrodynamics equations, including continuity, momentum, energy and induced magnetic field equations are with the respect of the gauss magnetic condition. the implemented numerical solution is based on harten, lax, vanleer (hlld) discontinuities solution methods....

Journal: :جنگل و فرآورده های چوب 0
محمد آزادفلاح استادیار گروه علوم و صنایع چوب و کاغذ، دانشکدة منابع طبیعی، دانشگاه تهران، کرج، ایران کژال مرادیان گیلان کارشناس ارشد صنایع خمیر و کاغذ، دانشکدة منابع طبیعی، دانشگاه تهران، کرج، ایران حسن موسوی پژوه کارشناس ارشد صنایع خمیر و کاغذ، دانشکدة منابع طبیعی، دانشگاه تهران، کرج، ایران محمد مهدی هادیلام کارشناس ارشد صنایع خمیر و کاغذ، دانشکدة مهندسی چوب و کاغذ، دانشگاه علوم کشاورزی و منابع طبیعی گرگان، گرگان، ایران الهه امینی کارشناس ارشد صنایع خمیر و کاغذ، دانشکدۀ منابع طبیعی، دانشگاه تهران، کرج، ایران

magnetic lignocellulosic fibers have good potential in applications such as information storage, security papers, electromagnetic shielding and etc. in this study unbleached bagasse fibers were used to fabricate magnetic paper by chemical co-precipitation method. lumen loading and precipitation of magnetic nanoparticles on the surface of fibers were carried out by in situ synthesis. then the fo...

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