Study of Nuclear States of Several Odd-ANuclei68<~Z<~79Through Electromagnetic Excitation from 2.3 TO 3.6 MeV.

1970 ◽  
Vol 25 (14) ◽  
pp. 979-979
Author(s):  
W. T. K. Johnson ◽  
B. T. Chertok ◽  
C. E. Dick
Keyword(s):  
Electromagnetic Excitation

Study on the Modes of Operation of a Multi-Machine Installations with Mechanical Reduction

2019 ◽  
pp. 12-22
Author(s):  
A. M. Oleynikov ◽  
L. N. Kanov
Keyword(s):  
Mathematical Description ◽  
Reactive Power ◽  
Maximum Efficiency ◽  
Wind Flow ◽  
System Of Equations ◽  
Mechanical Equilibrium ◽  
Synchronous Generators ◽  
Electromagnetic Excitation ◽  
Number Of Generators ◽  
Wide Range

The paper gives the description of the original wind electrical installation with mechanical reduction in which the output of vertical axis wind turbine with rather low rotation speed over multiplicator is distributed to a certain number of generators. The number of acting generators is determined by the output of actual operating wind stream at each moment. According to this constructive scheme, it is possible to provide effective and with maximum efficiency installation work in a wide range of wind speeds and under any schedule issued to the consumer of electricity. As there are no any experience in using such complexes, mathematical description of its main elements is given, namely windwheels, generators with electromagnetic excitation of magnetic electrical type, then their interaction with windwheel, and also the results of mathematical modeling of work system regimes under using the offered system of equations. The basis for the mathematical description of the main elements of the installation – synchronous generators – are the system of equations of electrical and mechanical equilibrium in relative units in rotating coordinates without considering saturation of the magnetic circuit. The equation of mechanical equilibrium systems includes torque and brake windwheel electromagnetic moments of generators with taking into account the reduction coefficients and friction. In addition, we specify the alternator rotor dynamics resulting from continuous torque of windwheel fluctuations under the influence of unsteady wind flow and wind speed serving as the original variable is modeled by a set of sinusoids. Model simplification is achieved by equivalization of similar generators and by disregarding these transitions with a small time constant. Calculation the installation with synchronous generators of two types of small and medium capacity taking into account the operational factors allowed us to demonstrate the logic of interactions in the main elements of the reported complex in the process of converting wind flow into the generated active and reactive power. We have shown the possibility of stable system work under changeable wind stream condition by regulating of the plant blade angle and with simultaneous varying of generator number of different types. All these are in great interest for project organizations and power producers.

Electromagnetic excitation of elastic modes in aluminium

1968 ◽  
Vol 26 (7) ◽  
pp. 296-297 ◽  
Author(s):  
P.K. Larsen ◽  
K. Saermark
Keyword(s):  
Electromagnetic Excitation ◽  
Elastic Modes

scholarly journals Experimental Investigation of a Nonlinear Energy Storage Effect due to High Power Electromagnetic Excitation

2020 ◽  
Vol 18 ◽  
pp. 75-82
Author(s):  
Robert Michels ◽  
Martin Schaarschmidt ◽  
Frank Gronwald
Keyword(s):  
Experimental Investigation ◽  
Energy Storage ◽  
Experimental Setup ◽  
Storage Effect ◽  
Nonlinear Circuit ◽  
Electromagnetic Excitation ◽  
Parameter Variations ◽  
Study Parameter ◽  
Loop Antennas ◽  
Nonlinear Energy

Abstract. The susceptibility of interference victims can significantly be influenced by the presence of nonlinear circuit elements. In addition to the well known occurrence of intermodulation-frequencies, other effects can be observed as well. Recently, a nonlinear energy storage effect has been discovered which is due to the presence of nonlinearly loaded loop antennas if excited by an HPEM-excitation. In this contribution, this effect is further studied by experiment. It is seen that the nonlinear energy storage effect can be reproduced by means of a rather simple experimental setup. This allows to straighforwardly study parameter variations in order to attain an improved understanding of the considered effect.

scholarly journals Hardware and Software Implementations of Measuring System for Resonant Electromagnetic Vibratory Conveyor

2017 ◽  
Vol 1 (1) ◽  
Author(s):  
Željko Despotović ◽  
Đorđe Urukalo ◽  
Aleksandar Ribić
Keyword(s):  
Industrial Process ◽  
Resonant Mode ◽  
Product Line ◽  
Measuring System ◽  
Electromagnetic Excitation ◽  
Efficient Operation ◽  
Testing And Measurement ◽  
Software Implementations ◽  
The Many ◽  
Vibratory Conveyor

Vibratory movements are one of the most ways for conveying and transportation of granular and particulate materials.Vibratory conveyors and feeders with electromagnetic excitation belong to a group of mechatronic devices that in an efficient wayprovides drive force and oscillations for this conveying. They have an important role in framework of the many industrial process inwhich are dominant the particulate materials: food processing, cement production, certain product line in steel industry,pharmaceutical industry, agriculture, etc. Therefore, they are representing a very important element of above mentioned technologicprocesses and production line. Especially, the vibratory conveyors and feeders that operate in the resonant mode are used in industrialapplications because of their energy efficiency increasing. The relatively small input energy of actuator drive causes intensivelyvibrations of load carry element (LCE) of vibratory conveyor. The intensity of the vibrations directly affects on gravimetric flow (massflow) and therefore on the productivity of vibratory conveyors. To ensure a reliable and energy-efficient operation of vibratoryconveyors, it is necessary to have a reliable and accurate measurement and testing of electrical and mechanical quantities. A hardwareand software implementation of the testing and measurement system of resonant vibratory conveyor with electromagnetic drive, andtheir corresponding data acquisition platform are presented in this paper. The experimental results obtained on a real laboratory setupof resonant vibratory conveyor are also shown.

scholarly journals Maxwell's Equations, Stokes' Theorem, and the Conservation of Charge

2019 ◽  
Author(s):  
Jonathan Gratus ◽  
Paul Kinsler ◽  
Martin W. McCall
Keyword(s):  
Black Holes ◽  
Effective Charge ◽  
Electromagnetic Theory ◽  
Careful Examination ◽  
Electromagnetic Excitation ◽  
Gauge Freedom ◽  
Charge Conservation ◽  
Vector Potentials ◽  
Vacuum Polarisation ◽  
A Charge

A careful examination of the fundamentals of electromagnetic theory shows that due to the underlying mathematical assumptions required for Stokes' Theorem, global charge conservation cannot be guaranteed in topologically non-trivial spacetimes. However, in order to break the charge conservation mechanism we must also allow the electromagnetic excitation fields D, H to possess a gauge freedom, just as the electromagnetic scalar and vector potentials $\varphi$ and A do. This has implications for the treatment of electromagnetism in spacetimes where black holes both form and then evaporate, as well as extending the possibilities for treating vacuum polarisation. Using this gauge freedom of D, H we also propose an alternative to the accepted notion that a charge passing through a wormhole necessarily leads to an additional (effective) charge on the wormhole's mouth.

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