Research on the Measurement and Control Technology of Controllable Alternating Magnetic Field Generator to Magnetized Breed

2013 ◽  
Vol 303-306 ◽  
pp. 601-606
Author(s):  
Guo Wen Hu ◽  
Li Sheng Zhang ◽  
Lin Wang ◽  
Yin Jie Wang
Keyword(s):  
Magnetic Field ◽  
Control Method ◽  
Magnetic Energy ◽  
Voltage Regulation ◽  
Resonant Circuit ◽  
Magnetic Field Measurement ◽  
Control Technology ◽  
Magnetic Field Generation ◽  
And Control ◽  
Measurement And Control

Controlled and alternating induction magnetic field generation device which induces plant seeds to breed on floor space has been developed. The incentive ferrite induction coil is used in the device to produce induced magnetic field. The common AC-DC-AC topology was adopted for the variable frequency power supply, and AC power inverter circuit adopts SPWM inverter frequency modulation and voltage regulation mode, realizing the sinusoidal VVF. In order to improve the conversion efficiency of system electrical energy to magnetic energy, the RLC series resonant circuit is chosen in the circuit of output magnetic field. Measurement and control system using DSP microcomputer measurement and control technology and digital PID control method. The frequency and intensity of inductive magnetic field in the air gap changes as the changes of current intensity in coils. The experimental study of rice seeds shows that test result is obviously better than traditional biological magnetization induced breeding technique of fixed magnetic poles.

Study on the Control Technology Device of Alternating Magnetic Field Inducing the Plants to Breed

2013 ◽  
Vol 655-657 ◽  
pp. 2001-2005
Author(s):  
Guo Wen Hu ◽  
Jin Tian Huang ◽  
Li Sheng Zhang
Keyword(s):  
Magnetic Field ◽  
Magnetic Energy ◽  
Electrical Energy ◽  
Air Gap ◽  
Resonant Circuit ◽  
Magnetic Field Generation ◽  
Field Frequency ◽  
Field Range ◽  
Growth Environment ◽  
Breeding Technique

Controlled and alternating induction magnetic field generation device which induces plant seeds to breed on floor space has been developed. The incentive ferrite induction coil is used in the device to produce induced magnetic field. In order to improve the conversion efficiency of the system electrical energy to magnetic energy, the RLC series resonant circuit is chosen in the circuit of output magnetic field. The induction magnetic field in the air gap is the work area for seeds experiment. The frequency and intensity of inductive magnetic field in the air gap changes as the current changes in coils. Its adjustable frequency range: 20~200Hz, adjustable field range: 0~500Gs. Changing the magnetic field frequency, magnetic field intensity and duration, can provide different growth environment for the seeds in order to increase production. The experimental study of rice seeds shows that the test result is obviously better than traditional biological magnetization induced breeding technique of fixed magnetic poles.

scholarly journals The formation of relativistic plasma structures and their potential role in the generation of cosmic ray electrons

2008 ◽  
Vol 15 (6) ◽  
pp. 831-846 ◽  
Author(s):  
M. E. Dieckmann
Keyword(s):  
Magnetic Field ◽  
Phase Space ◽  
Magnetic Energy ◽  
Ion Beam ◽  
Cosmic Ray ◽  
Compact Objects ◽  
Space Structures ◽  
Magnetic Field Generation ◽  
Particle In Cell ◽  
Field Generation

Abstract. Recent particle-in-cell (PIC) simulation studies have addressed particle acceleration and magnetic field generation in relativistic astrophysical flows by plasma phase space structures. We discuss the astrophysical environments such as the jets of compact objects, and we give an overview of the global PIC simulations of shocks. These reveal several types of phase space structures, which are relevant for the energy dissipation. These structures are typically coupled in shocks, but we choose to consider them here in an isolated form. Three structures are reviewed. (1) Simulations of interpenetrating or colliding plasma clouds can trigger filamentation instabilities, while simulations of thermally anisotropic plasmas observe the Weibel instability. Both transform a spatially uniform plasma into current filaments. These filament structures cause the growth of the magnetic fields. (2) The development of a modified two-stream instability is discussed. It saturates first by the formation of electron phase space holes. The relativistic electron clouds modulate the ion beam and a secondary, spatially localized electrostatic instability grows, which saturates by forming a relativistic ion phase space hole. It accelerates electrons to ultra-relativistic speeds. (3) A simulation is also revised, in which two clouds of an electron-ion plasma collide at the speed 0.9c. The inequal densities of both clouds and a magnetic field that is oblique to the collision velocity vector result in waves with a mixed electrostatic and electromagnetic polarity. The waves give rise to growing corkscrew distributions in the electrons and ions that establish an equipartition between the electron, the ion and the magnetic energy. The filament-, phase space hole- and corkscrew structures are discussed with respect to electron acceleration and magnetic field generation.

scholarly journals Strength in Numbers

2008 ◽  
Vol 41 (1) ◽  
pp. 21-24 ◽  
Author(s):  
Ludwik Finkelstein
Keyword(s):  
Control Technology ◽  
Basic Tool ◽  
Modern Thought ◽  
And Control ◽  
Measurement And Control

The paper looks at measurement as a basic tool of modern thought, with wide applications. It presents an informal overview of the fundamental principles of measurement and examines some of its general problems. It concludes that measurement and control technology has much to contribute to wider applications of measurement and much to learn from them.

Measurement and control technology of the size for large hot forgings

Measurement ◽  
2014 ◽  
Vol 49 ◽  
pp. 52-59 ◽  
Author(s):  
Yu-cun Zhang ◽  
Jun-xia Han ◽  
Xian-bin Fu ◽  
Fu-li Zhang
Keyword(s):  
Control Technology ◽  
And Control ◽  
Measurement And Control
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