Application Of Magnetic Methods Research Articles

Application of magnetic Method on Mapping the Geothermal Sources at Air Putih, Lebong, Bengkulu

Measurements have been made using the geomagnetic method in the Air Putih Tourism Area, Tambang Sawah Village, Pinang Belayar District, Lebong Regency with an area of 2000 m x 2500. Data collection was carried out using a Proton Procession Magnetometer (PPM) model G-856, which is a device with a proton sensor. which works based on the precess of the proton nucleus due to changes in the surrounding magnetic field and is equipped with other technical equipment, such as portable GPS (Global positioning system), types of navigation (maps of survey areas), such as talkies, umbrellas, pens, and recorded data. can be observed.. This research serves to map the potenTial for geothermal (geothermal), because this method is one of the geophysical methods that has advanTages in finding geothermal sources.Data processing is carried out using only Microsoft excel which can only plot magnetic anomalies and interpret qualitatively into initial research. To get the total animali, correction of IGRF (International Geomagnetics Reference Field) and correction of Daily Magnetic Value (diurnal). The results of this measurement obtained a magnetic field anomaly graph. This graph shows the high magnetic susceptibility value is found at poinT 43 which is suspected to be an area of economic value rock minerals and is in fracture zones and rocks with low susceptibility values are found at point 29 which can be suspected as a source area. hot water (hydrothermal). Keywords :Geomagnetic, Anomaly, and Hydothermal

Application of Magnetic Method in Shallow Investigation for Parts of ( Tall Arab-Kumbet ) Archaeological site / Southern Kirkuk City.

In this study a survey for the archaeological area of Tall-Arab (Kombat) has been done by magnetic method using ( MCL-2 microcomputer magnetometer ) which can measure the vertical component of the magnetic field. The studied area is located in Hay Al-Wasti which is located at about 15 km to the south of Kirkuk center. It covers about 1320 m2, with dimensions ( 120 * 110 )m. In the beginning a reconnaissance magnetic survey has done in order to choose the convenient measuring altitude of the sensor and the suitable station–spacing. Measurement were taken from 50 cm height above ground surface, with 10 m. station – spacing. The observed magnetic reading were corrected for the daily changing of earth magnetic field, while the normal correction was neglected because the space of the area is small and terrain correction was not applied because the area is nearly flat and sedimentary. Then a vertical field magnetic map was drawn from the corrected data. Many samples of archaeological bricks and soil were collected from the study to measure their magnetic susceptibility using the instrument ( SM-30 ). The magnetic data treated by applying different methods such as the graphical and the polynomial analyses for regional– residual separation. The qualitative and quantitative interpretation has done on the magnetic field map by using different limited ways and the central anomalies have been identified on the remaining and vertical magnetic field map. The quantitative interpretation has done using the fore ward modeling of chosen traverses by the program ( Mag2dc ). The qualitative and quantitative analyses showed that the negative anomaly are a result of the existence of canals, trenches or graves (cellars). Positive, linear-elongated anomaly reflect the existence of extended archaeological walls that have been built from mud or backed clay. Positive, circular or quasi-circular anomaly represent a base foundation for construction, which may have been destroyed or disintegrated by influence of weathering or other factors .

Application of magnetic method on the Argentine continental shelf between 35ºS and 48ºS

Se analizaron las anomalías del Campo Magnético Total a partir de datos de una red global, con el propósito de contribuir al conocimiento y caracterización de la plataforma continental argentina (35ºS hasta 48ºS). Para ello se utilizaron técnicas de realce, como la señal analítica, el ángulo tilt, y la segunda derivada vertical. Se calcularon las profundidades de las fuentes magnéticas a partir del método de deconvolución de Euler y el modelado de inversión gravimétrica 2D. A partir de los resultados filtrados del TMA se identificaron grandes zonas de fractura de transferencia. La segunda derivada vertical mostró patrones de alta frecuencia en las anomalías G y Tona, así como también en la serie de anomalías M y alineamientos de fondo oceánico, mostrando el carácter volcánico y episódico de los mismos. El método de deconvolución de Euler permitió localizar fuentes magnéticas discontinuas a lo largo del antiguo cinturón Dom Feliciano Lavalleja, cuyas profundidades van desde 5000 a 8000 m. Se obtuvieron pocas soluciones tipo diques, escalones de falla en las zonas de fallas de transferencia y el borde entre corteza continental y oceánica. Se localizaron fuentes en la serie-M a profundidades entre 8000 y 12000 m. También, este método permitió calcular las profundidades de la conspicua anomalía Tona entre 8000 y 20000 m. Además, a partir de un modelo de inversión gravimétrico 2-D aplicado sobre un perfil con dirección NE, se identificó un cuerpo máfico-ultramáfico a lo largo de la sutura Patagonia-Gondwana hasta casi la superficie. Este cuerpo podría ser una imbricación de la sutura emplazada en rocas del basamento.

Evaluation of a Nitrided Case Depth by the Magnetic Barkhausen Noise

Applicability of magnetic methods for non-destructive evaluation of plasma nitrided cases was investigated comprehensively. Nitrided layers of 60–800 $$~\upmu \hbox {m}$$ thicknesses were produced on a 16MnCr5 steel surface varying the plasma temperature, the nitriding time and atmosphere. Low-frequency Barkhausen noise was measured by a unique laboratory system to obtain physically grounded data. The laboratory measurements were performed at the triangular waveforms of the magnetizing voltage and the surface magnetic field. A typical rms envelope with a single peak positioned near the hysteresis coercive field was obtained for the unnitrided homogeneous sample. All nitrided samples with the hardened surface layer demonstrated an additional envelope peak at higher fields. Deeper nitridation suppressed both envelope peaks equally making the classical rms parameter sensitive to variation of the nitrided case depth. An industrial method of detection of the Barkhausen noise was tested for comparison using a commercial Rollscan device. The industrial measurements gave a single-peak envelope for all studied samples and a lower depth sensitivity of the rms parameter. Bulk testing methods, the magnetic hysteresis and the magneto-acoustic emission, were not able to detect the nitrided cases.

Testing the magnetic proxy χFD/HIRM for quantifying paleoprecipitation in modern soil profiles from Shaanxi Province, China

Soils are natural archives of paleoclimates, especially for paleoprecipitation. Environmental magnetic parameters of soils are of great interest for paleoenvironmental and paleoclimatic investigations. Generally, magnetite, maghemite, hematite, and goethite are the main minerals controlling the magnetic properties of soils. The application of magnetic methods in large areas is, however, limited due to the potential effects of parent material. Here, magnetic measurements were conducted on modern soil profiles along a North–South transect in Shaanxi Province, China, to test a new magnetic proxy, defined as the ratio between the absolute frequency dependent susceptibility and the hard isothermal remanence magnetization (χFD/HIRM) for paleoprecipitation estimation. More specifically, χFD and HIRM were used as semi-quantitative proxies for the ferrimagnets (magnetite and maghemite) and hematite concentrations, respectively. The proxy χFD/HIRM, estimated from the scatter plots of χFD and HIRM ranges between 4.5 and 97.6×10−5mA−1 and systematically increases with the mean annual precipitation (MAP) from 300 to 1000mm (χFD/HIRM=0.124×MAP−31.5, R2=0.92) with an error of ±70mm for the paleoprecipitation estimation, but is less related to mean annual temperature (MAT) (R2=0.29 for a MAT range of 8–15°C). For MAP<1000mm, both pedogenic ferrimagnet and hematite production increases with increasing MAP, which suggests that these minerals are likely to be genetically related. Nevertheless, the concentration of ferrimagnets increased more markedly than that of hematite. For a soil profile located in an area where MAP>1000mm, the χFD/HIRM value was only 17.8×10−5mA−1 as the likely result of reductive dissolution or alteration, the effect being more marked for ferrimagnets than for hematite. In summary, this new paleoclimatic transfer function has potential to predict MAP for Holocene soils with MAP<1000mm, providing that there is no reductive dissolution or alteration of the iron oxides and the effect of other influential factors (e.g. temperature) is taken into account.

Applications of magnetic methods in oil and gas exploration

Magnetic methods have been used in oil and gas exploration since the 1920s but, for most of that period, only to investigate major fault zones and map basement rocks. However, recent advances imply that now, under favorable conditions (and especially in combination with other geophysical and geochemical methods), magnetic techniques can play a bigger role in locating oil and gas fields.

Application of magnetic methods to deep basin structures

Although magnetic methods have long been used in basin studies the data are often underutilised since the formations of a relatively undeformed basin approximate sub-horizontal tabular sources except at basin edges. Horizontal sources are known to generate negligible anomalies. Very small angular deviations from tabularity, or horizontality, however, will generate very large responses at basin scale. This response is largely independent of source contrast, thickness, dip, or the orientation of either the source or the field but is very sensitive to small changes in dip differentials between upper and lower surfaces of the source.Classical rift sequence forms may account for many of the anomalies observed in basins and no presumption of basement sources is universally justified. Anomalies must be treated with basin perspective and scale and not as isolated elements.

Application of magnetic methods in quality control of rail parts: Sokolik, A.I.; Zalazinskii, M.G.; Blurtsyan, R.S. Industrial Laboratory, vol. 55, No. 6, pp. 695–696 (Dec. 1989)

Application of magnetic methods in quality control of rail parts: Sokolik, A.I.; Zalazinskii, M.G.; Blurtsyan, R.S. Industrial Laboratory, vol. 55, No. 6, pp. 695–696 (Dec. 1989)

Amorphous Magnetism Microscopic and Macroscopic Magnetic Anisotropies

Characteristic features of amorphous magnetism are described. Recent progress in a theory of the electronic states in amorphous Fe alloys is reviewed. Both microscopic and macroscopic magnetic anisotropies in amorphous alloys are discussed. The application of magnetic methods to the study of nonequilibrium systems would be effective.