Magnetic fields

Xem 1-20 trên 113 kết quả Magnetic fields
  • In this contribution several topics concerning magnetic fields and overhead medium voltage power lines are reviewed: simple formulation to assess the magnetic field (MF) level; characterization of magnetic fields generated by typical three-phase and one-phase primary distribution lines, with balanced and unbalanced current; and main mitigation techniques, analysed in relation with typical reduction level obtained. Additional data concerning cost and performance of different solutions are also provided....

    doc31p powersystem 06-07-2010 62 5   Download

  • Physical Phenomena at High Magnetic Fields-IV (PPHMF-IV) was the fourth conference sponsored by the National High Magnetic Field Laboratory (NHMFL). The previous conferences were held in May, 1991, 1995, and 1998. These meetings brought together experts in scientific research areas where high magnetic fields could make an important impact. PPHMF-III devoted substantial time to reviewing the state of many fields in regard to the role of high magnetic fields, such as semiconductors, heavy fermions, superconductivity, and molecular conductors.

    pdf542p camnhung_1 13-12-2012 16 4   Download

  • Lecture Engineering electromagnetics - The steady magnetic field presents the following content: Biot – Savart law, Ampere’s circuital law, Curl, Stokes’ theorem, magnetic flux and magnetic flux density, magnetic potential, derivation of the steady – magnetic – field law.

    pdf73p youcanletgo_04 17-01-2016 2 0   Download

  •  Some history:  Magnetic effects from natural magnets have been known for a long time. Recorded observations from the Greeks more than 2500 years ago.  The word magnetism comes from the Greek word for a certain type of stone (lodestone) containing iron oxide found in Magnesia, a district in northern Greece.  Properties of lodestones: could exert forces on similar stones and could impart this property (magnetize) to a piece of iron it touched.

    pdf50p thanhan 22-07-2009 76 10   Download

  • Magnetism often has a slight overtone of being mysterious. This is probably caused by the surprisingly strong forces between magnets which everybody can experience with magnetic toys, magnet boards, or similar objects. A strange effect is the unique ability of magnetic fields to penetrate many substances without any attenuation. Though the physical basis of magnetism is well explored, the outsider usually does not know very much about the details and sometimes tends to overestimate the real possibilities provided by magnetism.

    pdf656p chuyenphimbuon 21-07-2012 23 7   Download

  • Abstract The year 2008 marked the one hundredth anniversary of the observational discovery by George Ellery Hale of magnetic field in sunspots (Hale in Astrophys. J. 28:315–343, 1908). This observation, the first to suggest a direct link between the best-known variable features on the Sun and magnetism, started a line of research that has widened considerably over the last 100 years and is continuing today. Knowledge about all aspects of the Sun has increased in a remarkable way over the past few decades....

    pdf0p tom_123 14-11-2012 14 3   Download

  • The nation’s six synchrotron light sources, five neutron sources, and highfield magnet laboratory are uniquely valuable resources that contribute to the development of new products and processes, create jobs, enhance the skill level of the U.S. scientific community, and increase U.S. competitiveness. Because of the high cost of building and operating these facilities,1 only a limited number can be funded and they must be made widely available.

    pdf86p mnemosyne75 02-02-2013 11 1   Download

  • This chapter presents the following content: Force on a moving charge, force on a differential current element, force between differential current elements, force and torque on a closed circuit, magnetization and permeability, magnetic boundary conditions, the magnetic circuit, potential energy of magnetic fields, inductance and mutual inductance.

    pdf63p youcanletgo_04 17-01-2016 4 0   Download

  • We have known the close connection between changing eletric fields and magnetic fields. They can create each other and form a system of electromagnetic fields.  Electromagnetic fields can propagate in the space (vacuum or material environment). We call them electromagnetic waves. They play a very important role in science and technology.

    pdf49p thanhan 22-07-2009 89 19   Download

  • NMR is an experiment in which the resonance frequencies of nuclear magnetic systems are investigated. NMR always employs some form of magnetic field (usually a strong externally applied field B0) NMR is a form of both absorption and emission spectroscopy, in which resonant radiation is absorbed by an ensemble of nuclei in a sample, a process causing detectable emissions via a magnetically induced electromotive force.

    pdf20p qdung92ct 03-07-2012 55 10   Download

  • Since the advent of magnetic resonance (MR) imaging, systems with amagnetic field intensity of 1.5 tesla (T) have been deemed the gold standard for different clinical applications in all body areas. Ongoing advances in hardware and software have made theseMRsystems increasingly compact, powerful and versatile, leading to the development of higher magnetic field strength MRsystems (3.0 T) for use in clinical practice and for research purposes. As usually occurs with a new technology, 3.0 T MR imaging units will probably follow the same development trends in the years to come....

    pdf247p echbuon 02-11-2012 22 7   Download

  • Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Electron-Spin Precession in Dependence of the Orientation of the External Magnetic Field

    pdf4p dauphong17 21-02-2012 22 4   Download

  •  NMR in solids, like solution-state, relies on the behavior of nuclear spin energy levels in a magnetic field. However, the interactions that affect NMR spectra act differently.  In liquids, molecules reorient and diffuse quickly, leading to narrow isotropic resonances.  In solids, the fixed orientation of individual crystallites leads to a range of resonance frequencies for anisotropic interactions.

    pdf14p qdung92ct 03-07-2012 41 4   Download

  • Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: Histological analysis of the effects of a static magnetic field on bone healing process in rat femurs

    pdf9p panasonic05 22-12-2011 18 3   Download

  • Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Transmembrane potential induced on the internal organelle by a time-varying magnetic field: a model study

    pdf15p panasonic08 05-01-2012 22 3   Download

  • Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Topological confinement in an antisymmetric potential in bilayer graphene in the presence of a magnetic field

    pdf10p dauphong12 08-02-2012 22 3   Download

  • Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Alternating Magnetic Field Controlled, Multifunctional NanoReservoirs: Intracellular Uptake and Improved Biocompatibility

    pdf10p dauphong17 21-02-2012 18 3   Download

  • Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Binding Energy of Hydrogen-Like Impurities in Quantum Well Wires of InSb/GaAs in a Magnetic Field

    pdf4p sting10 07-03-2012 20 3   Download

  • Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Electron States and Light Absorption in Strongly Oblate and Strongly Prolate Ellipsoidal Quantum Dots in Presence of Electrical and Magnetic Fields

    pdf8p sting10 07-03-2012 15 3   Download

  • Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học Journal of Biology đề tài: Genetic effects of static magnetic fields. Body size increase and lethal mutations induced in populations of Drosophila melanogaster after chronic exposure

    pdf0p toshiba20 12-11-2011 20 2   Download

CHỦ ĐỀ BẠN MUỐN TÌM

Đồng bộ tài khoản