reactions
... The works in this part of project were focused on the preparation of YBCO bulk superconductors: 1st group – the sintered under varied conditions samples; and 2nd group – the melt-textured under special temperature profiles samples. All samples were shaped by pressing of YBCO powders in the form of d ...
... The works in this part of project were focused on the preparation of YBCO bulk superconductors: 1st group – the sintered under varied conditions samples; and 2nd group – the melt-textured under special temperature profiles samples. All samples were shaped by pressing of YBCO powders in the form of d ...
On the electromagnetic fields produced by marine frequency domain
... the electric currents that distribute charge occur on a time scale given by the charge relaxation time τ that has been shown to be very small compared to a typical period used in marine CSEM and hence their current fluctuations do not produce a magnetic field. However, the electric fields produced b ...
... the electric currents that distribute charge occur on a time scale given by the charge relaxation time τ that has been shown to be very small compared to a typical period used in marine CSEM and hence their current fluctuations do not produce a magnetic field. However, the electric fields produced b ...
Document
... Instrument used to detect and measure electrical current. A coil of wire pivoted between the poles of a permanent magnet is turned by the motor effect of an electric current by which a force acts on a wire carrying a current in a magnetic field. The extent to which the coil turns can then be related ...
... Instrument used to detect and measure electrical current. A coil of wire pivoted between the poles of a permanent magnet is turned by the motor effect of an electric current by which a force acts on a wire carrying a current in a magnetic field. The extent to which the coil turns can then be related ...
Low-field Classroom Nuclear Magnetic Resonance System Clarissa
... the static field, B~0 . This is done by applying a magnetic pulse at the Larmor frequency, B~1 , with the transmit coil. Typical Larmor frequencies are in the RF range so B~1 is often called the RF field. The word “resonance” in NMR corresponds to the necessity of matching the excitation field frequ ...
... the static field, B~0 . This is done by applying a magnetic pulse at the Larmor frequency, B~1 , with the transmit coil. Typical Larmor frequencies are in the RF range so B~1 is often called the RF field. The word “resonance” in NMR corresponds to the necessity of matching the excitation field frequ ...
Generation of parallel electric fields in the Jupiter–Io torus wake region
... Clarke et al., 2002, Figure 1b], where the Io-induced aurora is seen at the left with the brightest emissions at the base of the Io flux tube. An emission trail extends eastward. (bottom) The coordinate system used in this article. momentum exchange between Jupiter and the subcorotating plasma is re ...
... Clarke et al., 2002, Figure 1b], where the Io-induced aurora is seen at the left with the brightest emissions at the base of the Io flux tube. An emission trail extends eastward. (bottom) The coordinate system used in this article. momentum exchange between Jupiter and the subcorotating plasma is re ...
Study Unit Electrical Fundamentals
... called insulators. Plastic, nylon, ceramic, and other similar materials are very resistant to the flow of electricity and are classified as insulators. ...
... called insulators. Plastic, nylon, ceramic, and other similar materials are very resistant to the flow of electricity and are classified as insulators. ...
and Magnetism 2
... The first part of this magnitude will examine alternative powered circuits, circuits which display diverse combinations of resistance, inductance and capacity. The second part will examine the momentum of charged particles in both electric and magnetic fields. We will describe and explain J.J. Thomp ...
... The first part of this magnitude will examine alternative powered circuits, circuits which display diverse combinations of resistance, inductance and capacity. The second part will examine the momentum of charged particles in both electric and magnetic fields. We will describe and explain J.J. Thomp ...
Electromechanical hysteresis and coexistent states in dielectric elastomers * Suo 兲
... area. A recent experiment has shown that the homogeneous deformation of the layer can be unstable, giving way to an inhomogeneous deformation, such that regions of two kinds coexist in the layer, one being flat and the other wrinkled. To analyze this instability, we construct for a class of model ma ...
... area. A recent experiment has shown that the homogeneous deformation of the layer can be unstable, giving way to an inhomogeneous deformation, such that regions of two kinds coexist in the layer, one being flat and the other wrinkled. To analyze this instability, we construct for a class of model ma ...
a timeline of particle accelerators
... Wisconsin. As Van de Graaff had already experienced, there were several difficulties in maintaining a constant, high voltage—the most immediate of which was the prevention of spark formation between the spheres. Van de Graaff discovered he could reach and maintain higher voltages without sparking b ...
... Wisconsin. As Van de Graaff had already experienced, there were several difficulties in maintaining a constant, high voltage—the most immediate of which was the prevention of spark formation between the spheres. Van de Graaff discovered he could reach and maintain higher voltages without sparking b ...
Transients and inductance
... closed, the the rising rising current current II increases increases flux, flux, producing producing an an internal internal back back emf emf in in the the coil. coil. Open Open switch switch reverses reverses emf. emf. Increasing I ...
... closed, the the rising rising current current II increases increases flux, flux, producing producing an an internal internal back back emf emf in in the the coil. coil. Open Open switch switch reverses reverses emf. emf. Increasing I ...
PDF-2
... where the indices i, j and k can take on the values 1 to 3, such that ijk = +1 if ijk is an even permutation of 123 = −1 if ijk is an odd permutation of 123 = 0 otherwise (i.e. 2 or more indices are the same) ...
... where the indices i, j and k can take on the values 1 to 3, such that ijk = +1 if ijk is an even permutation of 123 = −1 if ijk is an odd permutation of 123 = 0 otherwise (i.e. 2 or more indices are the same) ...
Jets in Active Galactic Nuclei Alan P. Marscher
... where z is the redshift of the AGN, ne is the electron density of the screen in cm−3 , Bk is the component of the screen’s magnetic field along the line of sight in gauss, and spc is the path length through the screen in parsecs. Any electron-proton plasma inside the jet also causes rotation, althou ...
... where z is the redshift of the AGN, ne is the electron density of the screen in cm−3 , Bk is the component of the screen’s magnetic field along the line of sight in gauss, and spc is the path length through the screen in parsecs. Any electron-proton plasma inside the jet also causes rotation, althou ...
Electro Magnetic Field - Text of NPTEL IIT Video Lectures
... Curl of the phasor E is equal to minus del B del t, but now del del t is j omega. So, minus j omega phasor B curl of phasor H is equal to the phasor J plus j omega the phasor D. So, I have this 2 equations and to compare with them. Let me write down the original equation, which where curl of E is e ...
... Curl of the phasor E is equal to minus del B del t, but now del del t is j omega. So, minus j omega phasor B curl of phasor H is equal to the phasor J plus j omega the phasor D. So, I have this 2 equations and to compare with them. Let me write down the original equation, which where curl of E is e ...
Salinity gradient energy storage
... storage systems. Electrochemical batteries or pumped hydropower can be employed to store the energy when there is an excess, when needed this energy can be released again. It is however a challenge to store all the excess energy with the current electric energy storage capacity [1]. The need for a l ...
... storage systems. Electrochemical batteries or pumped hydropower can be employed to store the energy when there is an excess, when needed this energy can be released again. It is however a challenge to store all the excess energy with the current electric energy storage capacity [1]. The need for a l ...
Superconductivity
Superconductivity is a phenomenon of exactly zero electrical resistance and expulsion of magnetic fields occurring in certain materials when cooled below a characteristic critical temperature. It was discovered by Dutch physicist Heike Kamerlingh Onnes on April 8, 1911 in Leiden. Like ferromagnetism and atomic spectral lines, superconductivity is a quantum mechanical phenomenon. It is characterized by the Meissner effect, the complete ejection of magnetic field lines from the interior of the superconductor as it transitions into the superconducting state. The occurrence of the Meissner effect indicates that superconductivity cannot be understood simply as the idealization of perfect conductivity in classical physics.The electrical resistivity of a metallic conductor decreases gradually as temperature is lowered. In ordinary conductors, such as copper or silver, this decrease is limited by impurities and other defects. Even near absolute zero, a real sample of a normal conductor shows some resistance. In a superconductor, the resistance drops abruptly to zero when the material is cooled below its critical temperature. An electric current flowing through a loop of superconducting wire can persist indefinitely with no power source.In 1986, it was discovered that some cuprate-perovskite ceramic materials have a critical temperature above 90 K (−183 °C). Such a high transition temperature is theoretically impossible for a conventional superconductor, leading the materials to be termed high-temperature superconductors. Liquid nitrogen boils at 77 K, and superconduction at higher temperatures than this facilitates many experiments and applications that are less practical at lower temperatures.