Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 54 for “"remanence"”.
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Mitigation of Remanence Flux in Power Transformers using Predetermined Method of De-Energization
… that remain are magnetizing inrush and remanence embodied within Xₚ which occur dependent on three parameters. The parameters are primary resistance Rₛ (dependent on the location of same for the equivalent circuit used), the time dependent voltage at the point on the voltage wave when …
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The Art of SRAM Security: Tactics for Remanence-based Attack and Strategies for Defense
… architectural design choices impact SRAM's data remanence and its implications for security. This dissertation not only identifies new vulnerabilities due to SRAM data remanence but also paves the way for novel security solutions in the ongoing "security arms race". I present an attack, volt …
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Characterization and modeling of materials responsible for planetary crustal magnetism
… the types of minerals that can retain magnetic remanence. As the suite of magnetic materials used for studies of remanence expands, the need for new methods follows. The integration of rock magnetic techniques with microscopy and chemical analyses enables the reconstruction of increasingly …
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Self-Reversal of Remanent Magnetisation of Basalts - Origin, Mechanisms and Consequences
… and the domain state of the carriers of remanence is imperative. The emphasis of the present work was placed on the investigation of basalts exhibiting partial or complete self-reversal of natural remanent magnetisation (NRM). This phenomenon is not an exotic rarity but a widespread …
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ΓΕΩΜΑΓΝΗΤΙΚΕΣ ΜΕΛΕΤΕΣ ΣΕ ΛΙΜΝΑΙΑ ΙΖΗΜΑΤΑ
… IN THE WHOLE SEDIMENT (REVERSED ISOTHERMAL REMANENCE, CRYOMAGNETIC EXPERIMENTS, MODIFIED LOWRIE-FULLER TEST), SHOWED THE PRESENCE OF THE FINE GRAINED MAGNETITE IN DOMINANCE OF SINGLE DOMAIN OR PSEUDOSINGLE DOMAIN IN CHARACTER WHEREAS MAGNETIC EXTRACTS STUDIES (DEBYE-SCHERER X-RAY, …
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Theoretical studies of strongly interacting fine particle systems
… not reflected by experimental observations. The remanence curves of strongly interacting fine-particle systems were also investigated theoretically. It was shown that the Henkel plot of the dc demagnetisation remanence vs the isothermal remanence is a useful representation of interactions. The …
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Dynamic response and noise of recording media
… of remanent magnetisation along the isothermal remanence and dc demagnetisation remanence curves. The measurements are discussed in relation to VSM measurements of the remanent characteristics. Medium noise measurements are presented for commercial particulate media, experimental barium ferrite …
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Micromagnetic modelling and magneto-optical characterization of Ni/V2O3 hybrid structures
… with very small but similar change in magnetic remanence. For comparison micromagnetic simulations were done in Mumax3. The samples have a well defined growth direction, [111], so simulations were setup to replicate this. Nickel is a cubic crystal with easy axes <111>, hard axes <100> and medium …
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A PALAEOMAGNETIC STUDY OF CRUSTAL ROTATIONS AND THEIR RELATIONSHIP TO THE TECTONICS OF THE ATACAMA AND DOMEYKO FAULT SYSTEMS, NORTHERN CHILE
… clockwise rotation of approximately 42°. The remanence from the La Negra Formation passes both fold and reversal tests and is interpreted as a pre-folding remanence. Four of the five dyke swarms have mixed polarity, suggesting that they too carry a primary or very early remanence. The …
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Magnetic susceptibility mapping of Point Pelee National Park beaches.
… ARCGIS. Mineral magnetic analysis (anhysteretic remanence and saturation isothermal remanence measurements as well as temperature dependence of susceptibility measurements) indicated that the primary magnetic mineral throughout the Point Pelee beaches is pseudo single domain to single domain …
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Decline of the lunar dynamo
… has hindered interpretation of the magnetic remanence present in many young lunar samples. In this thesis, I demonstrate that the lack of stable magnetic remanence in many lunar samples may be attributed to their poor magnetic recording properties. I develop a method to determine the minimum …
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SOME MAGNETIC PROPERTIES OF BORE CORE SEDIMENTS
… to be correlated with variation in the radial remanence susceptibility (i.e. the capacity of remanence acquisition) in the North Sea and Prudhoe Bay cores and magnetic susceptibility in the North Sea cores. Simulation experiments of shock impact conducted on bore core materials suggests that …
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A combined experimental and computational study of nanopaleomagnetic recorders in meteoritic metal
… composition and structure, and how it acquires a remanence remain unanswered. To use the cloudy zone as a reliable and accurate paleomagnetic recorder, its properties have to be well understood. The particle size in the cloudy zone has been measured to be between $\sim$500 nm and $\sim$10 nm, …
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Transverse susceptibility measurements on particulate recording media
… of European laboratories. Results from Xi and remanence measurements were shown to be sensitive to subtle changes in dispersion quality due to processes such as solvent letdown. Measurements on a Ba-ferrite pigment were used to study the process of platelet stacking which was shown to result …
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Anisotropy and texture studies in magnetic media
… thin film samples. A new extended rotational remanence technique for anisotropy field measurements was developed. The technique is suitable for samples that contain aligned or partially aligned particles and provides both: in-plane anisotropy field distributions and the in-plane anisotropy …
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Encapsulamento de nanopartículas magnéticas em polímeros acrílicos e avaliação de hipertermia para potencial tratamento de câncer
… performed and evaluated. The low coercivity and remanence of magnetic nanoparticles, as well as the superparamagnetic behavior at room temperature, favor medical applications aimed at the conceiving of this work. Measures performed with the nanoparticles under external alternating magnetic field …
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Fabrication and characterization of nanostructured magnetic particles for applications in data storage
… spacing and material properties on the remanence state of nanomagnets is evaluated. Finally, we examine the suitability of the fabricated nanomagnet arrays for applications in magnetic data storage.
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New ways to tune the multi-functionality of oxide thin films for memory applications
… memory (MERAM) devices. The M-H curves and the remanence are tuned by applying electric fields at a low temperature (10 K). The possible origins for the magnetic modifications are discussed rationally, which include Joule heating, piezoelectric strain, current-induced induction field and charge …
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Magnetic analysis of nuclear pressure vessel steels and other ferromagnetic materials subject to neutron irradiation and heat treatment
… Microhardness and magnetic coercivity, remanence, permeability, and hysteresis loss were measured as a function of a variety of irradiation and annealing exposures. The results were interpreted in terms of dislocation and magnetic domain wall pinning mechanisms and internal stress …
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