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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Investigation of instability in magnetic amplifiers using non- square hysteresis loop core materials

Koontz, John Joseph, 1934- January 1960 (has links)
No description available.
2

Magnetic hysteresis modelling using knowledge based engineering techniques /

Saghafifar, Mahmoud. Unknown Date (has links)
Magnetic hysteresis modelling plays a crucial role in determining the electromagnetic properties of soft magnetic materials. A new approach to modelling is the use of recurrent neural networks, capable of time dependent, dynamic, sequential mapping. This research investigates the implementation and accuracy of this approach among other available hysteresis models. / Thesis (MEng(ElectronicsEngineering))--University of South Australia, 2004.
3

Magnetic hysteresis modelling using knowledge based engineering techniques

Saghafifar, Mahmoud January 2004 (has links)
Magnetic hysteresis modelling plays a crucial role in determining the electromagnetic properties of soft magnetic materials. A new approach to modelling is the use of recurrent neural networks, capable of time dependent, dynamic, sequential mapping. This research investigates the implementation and accuracy of this approach among other available hysteresis models. / thesis (MEng(ElectronicsEngineering))--University of South Australia, 2004.
4

Heuristic optimization methods for the characterization of dynamic mechanical properties of composite materials

Hornig, Klaus H. Flowers, George T. January 2007 (has links) (PDF)
Dissertation (Ph.D.)--Auburn University, 2007. / Abstract. Vita. Includes bibliographic references.
5

The Influence of a Surface on Hysteresis Loops for Single-Domain Ferromagnetic Nanoparticles

Alsari, Saad 09 May 2018 (has links)
No description available.
6

Interaction Effects in Nickel Nanowires Arrays

Trusca, Ovidiu Cezar 16 May 2008 (has links)
Systems of magnetic nanowires are considered strong candidates in many technological applications as microwave filters, sensors or devices for data storage. Because of their strong potential as candidates in such applications they became lately the object of many studies. However, due to the very complicated nature of the interwire interactions, their magnetic behavior is very difficult to be interpreted. The main parameter controlling the response of magnetic nanowires assemblies is the aspect ratio of the nanowires that is defined as the ratio of the length to the wire's diameter. In our study we choose to modify the aspect ratio by keeping a constant length of nanowires and modifying the wire's diameter while keeping the same interwire distance. The samples were studied at room temperature, using vibrating sample magnetometer and X-band ferromagnetic resonance experiments. The results are explained taking into account the effects of the magnetostatic interactions and shape anisotropy.
7

Polarization Switching of the Vertical-Cavity Surface- Emitting Laser with Optical Feedback

Tsai, Jin-ing 24 June 2009 (has links)
This research accomplished a series of investigations on the polarization switching of Vertical-Cavity Surface-Emitting Lasers (VCSEL). The research was preceded experimentally and theoretically to observe the variation of the VCSEL¡¦s polarization switching under various polarization optical feedback and various feedback ratios. A VCSEL with significant polarization-switching hysteresis loop was employed in the experiments to study the interaction between the optical feedback and polarization switching. The experimental results matched the theoretical simulations very well. These results could be interpreted with the graphic analysis of the linear gain model of the VCSEL. In the investigation of the polarization-switching hysteresis loop, experiments found that, inside the loop and at some constant current, the polarization switching would be conducted with a switching delay time. The switching delay time was shortened under stronger optical feedback, revealing an exponential dependence between the switching delay time and optical feedback ratio. In the experiments of small current modulation to continuously switch the laser¡¦s polarization, optical feedback could improve the success of the current-driven polarization switching, significantly enhancing its bandwidth. For a large-range tuning of the laser¡¦s current, as the current modulation frequency increased, the polarization-switching current in the increasing-current process would significantly shift toward the high current end, while the polarization-switching current in the decreasing-current process was affected less. These results greatly contribute to the understanding of the VCSEL¡¦s polarization switching.
8

Stress-strain hysteresis loops and rheological epicycles

Fancher, Douglas Roscoe, 1943- January 1968 (has links)
No description available.
9

Radio-frequency Heating of Magnetic Nanoparticles

Jagoo, Mohammud Zafrullah 19 April 2012 (has links)
No description available.
10

X-ray speckle experiments on the persistence and disintegration of magnetic memory /

Pierce, Michael Scott. January 2006 (has links)
Thesis (Ph. D.)--University of Washington, 2006. / Vita. Includes bibliographical references (p. 145-151).

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