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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 22 for “"REMANENT MAGNETIZATION"”.
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Remanent magnetization in angrite NWA 4931
… solar system. Towards this goal, the natural remanent magnetism and its origin were examined in newly discovered angrite NWA 4931. Measurements were conducted on subsamples cut from various distances along a drilled core sample of the meteorite. The samples were then progressively demagnetized …
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Remanent magnetization of Eastern United States triassic rocks
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Geology, 1960.
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Investigation of the upper mantle as a source for contribution to magnetic anomalies
… made, and edited the manuscript. Chapter 2 “Remanent magnetization in fresh xenoliths derived from combined demagnetization experiments: Magnetic mineralogy, origin and implications for mantle sources of magnetic anomalies” (2014) published in Tectonophysics by Martín-Hernández, Ferré, and …
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Paleomagnetism of Lonar impact glass
… paleofields, and possible motional remanent magnetization. Lonar Crater formed when a meteorite impacted a bed of Deccan Trap basalts. Upon impact, the basalt was super heated into a fluid melt that would have been ejected from the crater, moving at speeds that allowed the smaller …
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Paleomagnetic Constraints on Assembly of the Superior Craton: Results from the 2.72-2.69 Ga Vermilion District of the Wawa Subprovince, MN
… identify the processes that regionally overprint magnetizations. We present paleomagnetic data from greenstones in the 2.72-2.69 Ga Vermillion Belt, Superior Craton, Minnesota. The Vermillion Belt has experienced lower greenschist facies alteration associated with volcanic-hosted massive sulfide …
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Topology optimization and physical realization of magnetically active soft materials: from reprogrammable metamaterials to biomedical robots
… with magnetic particles that can retain high remanent magnetization, offer exceptional programmability and flexibility. As an initial exploration in the design optimization for this material, we develop a comprehensive topology optimization framework for magnetic soft materials to guide the …
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Magnetic anomalies over a portion of the Granite Mountains, central Wyoming
… <p>Comparison of the magnetic susceptibility and remanent magnetization measurements suggest that the main contribution to total magnetization is magnetic susceptibility. Although remanent magnetization does exist within the samples measured, modified Köinigsberger ratios (Q') indicate that it …
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A paleomagnetic study of early tertiary basalts in West Texas
The natural remanent magnetization of thirty-one early Tertiary lava flows from West Texas was measured. Stratigraphic controls and some potassium-argon dates were used to determine the relative age of the flows. Stability of magnetization was established by ac demagnetization. Because of large …
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A paleomagnetic study of the angrite Sahara 99555
… titanomagnetite and hematite. The natural remanent magnetization (NRM) of SAH 99555 appears to have a low-coercivity component probably from a collector's hand magnet or the Earth's field as well as a high-coercivity component, similar to D'Orbigny, another angrite. The paleointensity …
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Decline of the lunar dynamo
… presence of unstable alternating field (AF) demagnetization behavior 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 …
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Effects of anisotropic magnetic susceptibility in data interpretation and its potential in application
… is to assess the influence of AMS on induced magnetization and to explore the possibility of extracting structural information from magnetic data containing the influence of AMS. In this work, I review the basic mathematical expression of AMS and examine the rotation matrix through the …
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Experimental study of the spin-glass phase diagram
… an1sotropy, pseudo-logarithmic decay of the remanent magnetization, and scaling of the non-linear susceptibility. The spin-glass transition is clearly shown to occur only in the basal plane of this hexagonal system. The results of this work show that mean-field theory is a useful tool in …
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Oceanic lithosphere magnetization : marine magnetic investigations of crustal accretion and tectonic processes in mid-ocean ridge environments
… a magnetic signal. Both lithologies have stable remanent magnetization, capable of contributing to the magnetic source layer. The geometry of the polarity boundary changes from the northern to the central regions of KMM and is believed to be related to changing lithology. In the northern region, …
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Paleomagnetic and mineral magnetic studies of zinc-lead ore deposits in the Metaline (Washington state, USA) and Midlands (Ireland) ore fields
… dating, indicate coeval postfolding magnetizations acquired during the Middle Jurassic (166+-6 Ma), in the waning stages of the Nevadan Orogeny. The thermal (Th) and alternating field (AF) step demagnetization, saturation isothermal anaylses (SIRM), and artificial specimens' tests …
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Timing and emplacement of the Philipsburg batholith, SW Montana, and a comparison of two magnetic fabric techniques
… igneous rocks. The anisotropy of anhysteretic remanent magnetization (AARM) allows determination of the anisotropy of ferro/ferrimagnetic minerals in igneous rocks, which have a strong control on AMS. Chapter One investigates the relationship of magma flow to local structures in the Philipsburg …
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Oceanic lithosphere magnetization : marine magnetic investigations of crustal accretion and tectonic processes in mid-ocean ridge environments
… a magnetic signal. Both lithologies have stable remanent magnetization, capable of contributing to the magnetic source layer. The geometry of the polarity boundary changes from the northern to the central regions of KMM and is believed to be related to changing lithology. In the northern region, …
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Early Mesozoic stratigraphy, sedimentology and structure of the
… Most of these samples convey a weak but stable remanent magnetization. The Al Aziza Formation yielded a primary remanence that has suffered a substantial post-acquisition clockwise rotation (~50˚). Restoration of the rotation about a simple vertical axis would place the pole on the APW path at …
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Paleomagnetism of Late Triassic and Jurassic sediments of the southwestern United States.
… rates based on previous APW paths. Thermal demagnetization and data analysis indicate that within-site dispersion is an important criterion for selecting sites which retain a high unblocking-temperature, characteristic remanent magnetization (ChRM). This criterion was used to define at least …
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Modeling of magnetorheological elastomers
… systems in this model demonstrate non-zero remanent magnetization and switching fields for the magnetization direction. This more sophisticated modeling approach was used to study the combined response of MREs to magnetic fields and strains. Shear strain simulations for two particle systems …
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Mathematic approaches for the calibration of the CHAMP satellite magnetic field measurements
… during tests before launch. Among them are the remanent magnetization of the spacecraft and fields generated by currents. They are all considered to be constant over the mission life. The 8 years of operation experience allow us to investigate the long-term behaviors of the magnetometers and the …
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