AEROMAGNETIC FIELD TEST OF TOTAL INTENSITY UPWARD CONTINUATION

Geophysics ◽  
1971 ◽  
Vol 36 (2) ◽  
pp. 418-425 ◽  
Author(s):  
Angelo L. Kontis
Keyword(s):  
Dirichlet Problem ◽  
Field Test ◽  
Theoretical Basis ◽  
Numerical Evaluation ◽  
Integral Formula ◽  
Intensity Data ◽  
Magnetic Intensity ◽  
Normal Field ◽  
Area Of Interest ◽  
Upward Continuation

The theoretical basis for applying the upward‐continuation integral, [Formula: see text]z⩽0, (1) to total magnetic intensity data T(α, β) measured on the plane z=0 has been recently reviewed by Henderson (1970). To perform upward continuation in the spatial domain, weights or coefficients obtained by numerical evaluation of equation (1) (Peters, 1949; Henderson, 1960; Fuller, 1967) may be convolved with the total intensity anomaly T(α, β) to produce T(x, y, z) at heights z<0 (for z positive downward). The accuracy of upward continuation is, therefore, dependent on the validity of the numerical coefficients and of the assumptions required to show that T(α, β) satisfies the conditions of the Dirichlet problem for a plane. These assumptions are that the quantity sensed by a total‐intensity magnetometer is in the direction of the earth’s normal field and that this direction is invariant over the area of interest.

ON THE VALIDITY OF THE USE OF THE UPWARD CONTINUATION INTEGRAL FOR TOTAL MAGNETIC INTENSITY DATA

Geophysics ◽  
1970 ◽  
Vol 35 (5) ◽  
pp. 916-919 ◽  
Author(s):  
Roland G. Henderson
Keyword(s):  
Dirichlet Problem ◽  
Coordinate System ◽  
Intensity Data ◽  
Magnetic Intensity ◽  
Rectangular Coordinate System ◽  
Normal Field ◽  
Upward Continuation ◽  
Gravity Fields

The integral solving the Dirichlet problem for a plane, known as the “upward continuation integral” to exploration geophysicists working with magnetic and gravity fields, is sometimes misunderstood. Recently, some geophysicists have commented that its use in continuing ΔT, the component of the total intensity anomaly in the direction of the earth’s normal field, is suspect, the thought being that only components normal to the surface can be so continued. The integral in question is [Formula: see text]where ΔT(α, β) represents measured total intensity values on the plane of observations z=0, in a right handed rectangular coordinate system in which the z axis is positive vertically downward.

The Application of Particle Motion Equation in Coal Handling System of Dissipation Dust Law

2013 ◽  
Vol 313-314 ◽  
pp. 702-705
Author(s):  
Shao Cheng Ge ◽  
Yao Xuan Feng ◽  
De Ji Jing
Keyword(s):  
Numerical Simulation ◽  
Field Test ◽  
Particle Motion ◽  
Theoretical Basis ◽  
Coal Dust ◽  
Motion Equation ◽  
Dust Concentration ◽  
Dust Particles ◽  
Space Application ◽  
Handling System

For getting the effectiveof application in dissipation dust law with particle motion equation atcoal handling system of belt machine tail, must be to proceed related numerical simulation in the way of dust particles motion incoal handling system of belt machine tail and dust concentration of diffusion inoperation space. Application particlemotion equation theory for numerical simulation to coal dustparticles, obtained dust coal dissipation law in coal handling system, at thesame time combine with the data of the field test of dust concentration andfallout dispersion for analyzing and comparing. The results of comparison showthat: the data of numerical simulation with particle motion equationin coal dust dissipation law is coincide with reality dissipation law. Accordingto the conclusion of this research, it is provides theoretical basis forprevention and treatment in coal mine of coal handling system of dustdissipation.

THE UPWARD CONTINUATION OF ANOMALIES IN TOTAL MAGNETIC INTENSITY FIELDS

Geophysics ◽  
1949 ◽  
Vol 14 (4) ◽  
pp. 517-534 ◽  
Author(s):  
Roland G. Henderson ◽  
Isidore Zietz
Keyword(s):  
Three Dimensional ◽  
Magnetic Intensity ◽  
Mathematical Basis ◽  
Upward Continuation ◽  
Multi Level

In airborne magnetometry consideration must be given to the necessity of multi‐level observations. The problem of computing total intensity anomalies from data observed on lower levels is investigated in the case of contours exhibiting both two‐ and three‐dimensional features. It is found that even fairly complex anomalies can be extended, with results differing but slightly from observations at the higher level. Maps for comparing computed and observed anomalies are presented. The mathematical basis is given together with numerical formulas and procedures for affecting the computations.

scholarly journals Utilization of Metallurgy—Beneficiation Combination Strategy to Decrease TiO2 in Titanomagnetite Concentrate before Smelting

Minerals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1419
Author(s):  
Pan Chen ◽  
Yameng Sun ◽  
Lei Yang ◽  
Rui Xu ◽  
Yangyong Luo ◽  
...  
Keyword(s):  
Theoretical Basis ◽  
Magnetic Intensity ◽  
Optimal Conditions ◽  
X Ray Diffraction ◽  
Spectroscopy Analysis ◽  
Combination Strategy ◽  
X Ray ◽  
Roasting Temperature ◽  
Grade 3 ◽  
Scanning Electron

Excessive TiO2 in titanomagnetite concentrates (TC) causes unavoidable problems in subsequent smelting. At present, this issue cannot be addressed using traditional mineral processing technology. Herein, a strategy of metallurgy-beneficiation combination to decrease the TiO2 grade in TC before smelting was proposed. Roasting TC with calcium carbonate (CaCO3) together with magnetic separation proved to be a viable strategy. Under optimal conditions (roasting temperature = 1400 °C, CaCO3 ratio = 20%, and magnetic intensity = 0.18 T), iron and titanium was separated efficiently (Fe grade: 56.6 wt.%; Fe recovery: 70 wt.%; TiO2 grade 3 wt.%; TiO2 removal: 84.1 wt.%). X-ray diffraction, scanning electron microscopy, and energy dispersive spectroscopy analysis were used to study the mechanisms. The results showed that Ti in TC could react with CaO to form CaTiO3, and thermodynamic calculations provided a relevant theoretical basis. In sum, the metallurgy-beneficiation combination strategy was proven as an effective method to decrease unwanted TiO2 in TC.

scholarly journals Application of Ground Magnetic Geophysical Method in the Delineation of Subsurface Structures of Dala Hill in Kano Ancient City, Northwest Nigeria

2020 ◽  
Vol 7 (4) ◽  
pp. 147-152
Author(s):  
Abdulazeez Shehu ◽  
Mohammed Saleh ◽  
Abubakar M. Hotoro ◽  
Abdulrahim A. Bunawa
Keyword(s):  
Magnetic Measurement ◽  
Intensity Data ◽  
Magnetic Intensity ◽  
Depth Of Penetration ◽  
Subsurface Structures ◽  
Ancient City ◽  
Ground Magnetic ◽  
The Hill ◽  
2D And 3D ◽  
Body Parameters

Ground Magnetic measurement was carried out with the aim of delineating the subsurface structures on Dala hill, Kano State. Total magnetic intensity data were acquired using the SCINTREX proton precession magnetometer along closely spaced traverses. The acquired total magnetic intensity data were reduced and plotted using Golden Surfer software to produce the 2D and 3D surface maps for visual inspection. Five profiles AB, CD, EF, GH and IJ were selected for forward modelling using Mag2dc software to give detail information about the causative body parameters. The depths of these bodies from the surface fall in the interval 0.0 m to 8.5 m. The high magnetic anomaly field ranges from -21,752 to 47,205 nT which suggested area of iron occurrences. The study categorized the identified major anomalous features into two: the shallower bodies which penetrated down to a maximum depth of 67.3 m were inferred to be disturbed sediments, fire pits and kilns; whereas the rest, the deep-rooted features with greater depth of penetration reaching up to 193.2m, have high susceptibility range of up to 7.3 SI units, were interpreted to be intrusive ferromagnetic bodies. The findings of the study were in close agreement with recent archaeological findings about the hill.

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