scholarly journals Magnetic susceptibility of the body-centred orthorhombic La2CuO4system

2005 ◽  
Vol 17 (42) ◽  
pp. 6701-6728 ◽  
Author(s):  
Kyrylo V Tabunshchyk ◽  
R J Gooding
Keyword(s):  
Magnetic Susceptibility ◽  
The Body

THE DETERMINATION OF AN INFINITE INCLINED DIKE FROM THE RESULTS OF GRAVITY AND MAGNETIC SURVEYS

Geophysics ◽  
1948 ◽  
Vol 13 (3) ◽  
pp. 437-442 ◽  
Author(s):  
Laszlo Egyed
Keyword(s):  
Magnetic Susceptibility ◽  
Magnetic Anomaly ◽  
The Body ◽  
Gravitational Gradient ◽  
Ore Bodies ◽  
Gravity And Magnetic ◽  
Anomalous Density

The equations are given for the gravitational gradient and curvature, and for the horizontal and vertical components of the magnetic anomaly for ore bodies of the Kursk type. It is then shown how from these equations the depth, width of crest, angle of dip, anomalous density and magnetic susceptibility of the body may be determined.

A magnetic model for the Budgell Harbour Stock, Newfoundland

1976 ◽  
Vol 13 (2) ◽  
pp. 231-236 ◽  
Author(s):  
H. G. Miller
Keyword(s):  
Magnetic Susceptibility ◽  
Detailed Analysis ◽  
The Body ◽  
Aeromagnetic Data ◽  
Surface Rock ◽  
Rock Samples ◽  
Magnetic Model ◽  
Apparent Susceptibility

A detailed analysis of the aeromagnetic data over the Budgell Harbour Stock indicates that the stock can be modelled as a vertical prism having a depth to the bottom of approximately 5.5 km. The depth of the body has been calculated using the measured magnetic susceptibility and NRM data for 6 sample sites from the stock. The modelling results indicate that the apparent susceptibility determined from the surface rock samples are too small to explain the observed anomaly. This indicates that the true apparent susceptibility for the stock is larger than the observed apparent susceptibility.

Revision of the Age of Construction Phases of a Mound Dated to the Late Copper–Early Bronze Age in Eastern Hungary Relying on14C-Based Chronologies

Radiocarbon ◽  
2018 ◽  
Vol 60 (5) ◽  
pp. 1403-1412
Author(s):  
Gábor Szilágyi ◽  
Pál Sümegi ◽  
Sándor Gulyás ◽  
Dávid Molnár
Keyword(s):  
Magnetic Susceptibility ◽  
Bronze Age ◽  
The Body ◽  
Early Bronze Age ◽  
Burial Mound ◽  
The Absolute ◽  
Geochemical Analyses

ABSTRACTEcse Mound is a burial mound in the Hortobágy region of eastern Hungary. Built by prehistoric nomadic peoples from the east, it now stands on the border between two modern settlements. The construction of the mound was assumed to be related to representatives of the Pit Grave Culture populating the area between the Late Copper and Bronze Ages. This theory considered similarities in shape, orientation, and stratigraphy of this mound with other absolute-dated ones in the Hortobágy region alone. The mound comprises two construction layers as indicated by magnetic susceptibility and on-site stratigraphic observations. According to detailed sedimentological, geochemical analyses of samples taken from the bedrock, artificial stratigraphic horizons, and the overlying topsoil, there is a marked similarity between the soil forming the body of the mound in both artificial horizons and the underlying bedrock soil. In contrast the pedological, geological character of the modern topsoil is utterly different. According to our dating results, the uppermost stratigraphic horizon is coeval with the absolute-dated mounds in the region, assigning it to the period of the Pit Grave Culture. However, the lower anthropological horizon is older and dates to between the Early and Late Copper Ages.

scholarly journals A method of measuring magnetic susceptibilities

1931 ◽  
Vol 132 (820) ◽  
pp. 442-459 ◽  
Keyword(s):  
Magnetic Field ◽  
Magnetic Susceptibility ◽  
Torsion Balance ◽  
The Body ◽  
Small Element ◽  
Uniform Field ◽  
Magnetic Susceptibilities ◽  
Wide Range ◽  
Faraday Method ◽  
The Magnetic Field

Among the different methods which can be used to measure the magnetic susceptibility of feebly magnetic substances, the most practical, and those most frequently employed at the present time, depend essentially on the measurement of the force acting on the substance when placed in a non-uniform field. This force is given by the well-known formula F x = χ ∫ v 0 H d H/d x d V, where χ is the volume susceptibility, (H) is the magnetic field, d H/ d x is the gradient of the magnetic field in the direction x in which the force is measured at the site of a small element of volume ( d V). Corresponding to the wide range of susceptibility, and to the different physical states and conditions which occur, a number of methods of measuring this force have been developed. In all these methods, since they are based on the measurement of the force on the substance, and since it is by the displacement of the body that the force is measured, it is essential that the body should be movable. The force acting on the body is small, usually only a few dynes, and delicate methods have to be used for making the measurements, as, for instance, in the Curie-Faraday method where the substance is carried on a sensitive torsion balance.

scholarly journals MINERALIZAÇÃO DE Fe-Ti-V ASSOCIADA AO GABRO MARCOS DA COSTA (MIGUEL PEREIRA), ESTADO DO RIO DE JANEIRO

2018 ◽  
Author(s):  
Ronaldo Mello Pereira ◽  
Marcelo Salomão ◽  
Reiner Neumann ◽  
Paulo Guimarães ◽  
Enrico Pedroso
Keyword(s):  
Magnetic Susceptibility ◽  
Rio De Janeiro ◽  
The State ◽  
The Body ◽  
Total Weight ◽  
Chemical Analyses ◽  
Primary Flow ◽  
Basal Portion ◽  
Mineral Concentrations ◽  
Janeiro State

O Gabro Marcos da Costa, localizado em Miguel Pereira, é mais um dos registros de rochas gabroides encontrados no estado do Rio de Janeiro. O corpo tem formato lenticular, 2,7 km2 de área aflorante, é estruturalmente isotrópico e sem presença visível de texturas primárias como a orientação por fluxo ou cumuláticas. Amostras do gabro foram submetidas a análises químicas e medidas de susceptibilidade magnética (SM). Possui caráter toleítico, com trend de enriquecimento em Fe. A ambientação tectônica é do tipo intraplaca e possível geração a partir de magma basáltico de alto-Ti (>3% TiO2). Os teores em TiO2 e V em rocha total são equiparáveis aos encontrados em gabros que encerram mineralizações em Fe-Ti-V. Ilmenita e magnetita, geralmente vanadinífera, são os principais minerais opacos e encontram-se disseminadas na rocha. A composição química da magnetita determinada em MEV-EDS varia de: 90,23% a 98,77% de FeOt, 0,07% a 0,42% de TiO2 e 0,59% a 2,13% de V2O5. Os valores de SM medidos em afloramentos estão entre -0.44 x10-4 a 89.4 x10-4 SI-emu. Em afloramento, por meio dessas medidas de SM, percebe-se a presença de níveis e bandas centimétricas aonde a concentração de minerais ferromagnéticos chega a até 22% em peso e interpretadas como estratificação magmática. As maiores concentrações de minerais ferromagnéticos ocorrem na parte setentrional do corpo aqui considerada como a porção basal da câmara magmática.Palavras Chave: mineralização de Fe-Ti-V, gabro, Rio de Janeiro, magnetita vanadiníferaAbstract:Fe-Ti-V MINERALIZATION ASSOCIATED WITH GABRO MARCOS DA COSTA (MIGUEL PEREIRA), RIO DE JANEIRO STATE. Marcos da Costa Gabbro, located in Miguel Pereira city, is one of the records of gabbroid rocks found in the state of Rio de Janeiro. The body is lenticular shape, with 2.7 km² outcrops, structurally isotropic and without visible presence of primary flow or cumulate textures. Gabbro samples were submitted to chemical analyses and magnetic susceptibility measurements (MS). Its character is toleithic, with trend of enrichment in Fe. The tectonic ambiance is intraplate type, with possible generation from basalt with high-Ti (> 3% TiO2). The TiO2 and V contents are comparable to those found in gabbros containing Fe-Ti-V mineralizations. Ilmenite and magnetite, usually vanadiniferous, are scattered in the rock. The magnetite contents determined in SEM-EDS vary from: 90.23% to 98.77% of FeOt, 0.07% to 0.42% of TiO2 and 0.59% to 2.13% of V2O5. MS values range from -0.44 x10-4 to 89.4 x10-4 SI-emu. Levels and centimeter bands with high MS exhibit ferromagnetic mineral concentrations of up to 22% of total weight and were interpreted as magmatic layering. The highest concentrations of ferromagnetic minerals occur in the northern part of the body here regarded as the basal portion of the magma chamber.Keywords: Fe-Ti-V mineralization, gabbro, Rio de Janeiro, vanadiferous magnetite

scholarly journals A contribution to the study of the magnetic properties of manganese and of some special manganese steels

1917 ◽  
Vol 94 (657) ◽  
pp. 65-87 ◽  
Keyword(s):  
Magnetic Properties ◽  
Magnetic Susceptibility ◽  
Opposite Direction ◽  
Torsion Balance ◽  
The Body ◽  
Unit Mass ◽  
Chemical Constitution ◽  
The Difference ◽  
Manganese Steels ◽  
Magnetic Balance

The object of this research has been to find a connection between the magnetic susceptibility per unit mass (called the mass susceptibility) of different manganese steels and their chemical constitution. All measurements were made with the help of the magnetic balance of P. Curie and C. Chéneveau. In this instrument the body to be tested is attached to one arm of a torsion balance. A horseshoe magnet can be moved horizontally, so that the direction of motion is at right angles to the line joining the poles, and the body is gradually brought into a stronger and stronger field. The observed deflection of the torsion balance increases at first, then diminishes, and becomes zero when the body lies between the poles of the magnet. If the magnet be moved still further, a deflection in the opposite direction is observed, which again passes through a maximum at the point where the variation of the field of force is greatest. Fig. 1 illustrates the deflections observed in a particular case. The difference between the readings of the torsion balance when the deflections are greatest on either side is proportional to the mass susceptibility, so that this quantity may be determined by comparison with a specimen whose susceptibility is known. Throughout the paper the mass susceptibility is denoted by the symbol X .

Systematic error analysis of demagnetization and implications for magnetic interpretation

Geophysics ◽  
2001 ◽  
Vol 66 (2) ◽  
pp. 562-570 ◽  
Author(s):  
Wanwu Guo ◽  
Michael C. Dentith ◽  
Robert T. Bird ◽  
David A. Clark
Keyword(s):  
Magnetic Susceptibility ◽  
Error Analysis ◽  
Systematic Error ◽  
Extreme Values ◽  
The Body ◽  
Magnetic Data ◽  
Magnetic Interpretation ◽  
Direction Error ◽  
Effective Magnetization ◽  
Flattening Ratio

Demagnetization can affect the interpretation of magnetic data significantly. However, little attempt has been made to understand its effects by analyzing systematically the differences between demagnetization‐ corrected and uncorrected magnetic properties. A systematic error analysis is made in this paper using a 2-D elliptic cylinder model. Generally, demagnetization changes the effective susceptibility and remanence or the effective magnetization in both magnitude and direction. Error analyses show that demagnetization causes the magnitude of effective magnetization of a magnetic body to be less than its intrinsic magnetization. This implies that a theoretical anomaly computed without accounting for demagnetization will overestimate the amplitude of the anomaly associated with the body. The decrease in magnetization magnitude depends on the intrinsic magnetic susceptibility of a body as well as on the body’s geometry (flattening ratio) and its relative orientation (magnetic dip) in the geomagnetic field. The magnitude of the effective magnetization, relative to the intrinsic magnetization, decreases with increasing intrinsic magnetic susceptibility. This factor dominates the body’s effective magnetization. When intrinsic magnetic susceptibility is less than 0.1 SI, the demagnetization effects are generally insignificant and may be ignored in magnetic anomaly modeling. The magnetic dip and flattening ratio only cause minor fluctuations in the effective magnetization. Demagnetization also changes the direction of the effective magnetization vector by making it approach the plane of flattening of any flattened body. The difference between the inclinations of the effective and intrinsic magnetization changes the horizontal positions of extreme values of an anomaly, which may affect the precision of magnetic interpretations. Generally, the inclination difference is significant for magnetic dips of 30° to 70° and increases with increasing susceptibility and decreasing flattening ratio. In particular, for large flat‐lying magnetic geological units located at middle magnetic latitudes (30° to 70°), significant magnetic inclination deflections are expected because of demagnetization effects. Theoretical, experimental, and practical examples of magnetic interpretation are presented to illustrate these demagnetization effects.

Representing utility and deploying the body

2020 ◽  
Vol 43 ◽  
Author(s):  
David Spurrett
Keyword(s):  
Functional Activity ◽  
Degrees Of Freedom ◽  
The Body ◽  
Target Article ◽  
Processing Demands ◽  
The Many

Abstract Comprehensive accounts of resource-rational attempts to maximise utility shouldn't ignore the demands of constructing utility representations. This can be onerous when, as in humans, there are many rewarding modalities. Another thing best not ignored is the processing demands of making functional activity out of the many degrees of freedom of a body. The target article is almost silent on both.

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