Positive test of the paleomagnetic method for estimating burial depth using a dike contact

1980 ◽  
Vol 17 (6) ◽  
pp. 690-697 ◽  
Author(s):  
D. T. A. Symons ◽  
H. I. Hutcheson ◽  
M. Stupavsky
Keyword(s):  
Magnetic Force ◽  
Magnetic Measurements ◽  
Force Balance ◽  
The Other ◽  
Positive Test ◽  
Burial Depth ◽  
Crystalline Complex ◽  
Flow Equations ◽  
Conduction Heat Flow ◽  
Erosion Surface

Detailed magnetic measurements were made on specimens from profiles across the contact zones of two unmetamorphosed Miocene diabase dikes. The dikes cut Cretaceous plutonic rocks of the Coast Crystalline Complex near Bella Bella, British Columbia. The dikes feed flat-lying basalts that outcrop nearby. This indicates post-Miocene uplift is less than 1 km in the area. Alternating field demagnetization, magnetic susceptibility, thermal demagnetization, and magnetic force balance measurements were made on the specimens. From them, the distance from the contact and the maximum reheated temperature of the magnetic hybrid zone were determined. Results are reported for the Thorburne Island contact only because the other contact had unsuitable remanence characteristics. Using standard conduction heat flow equations the ambient temperature of the host rock at the time of intrusion was found to be 18 ± 5 °C giving a determined depth for the present erosion surface at the time of intrusion of 0.3 ± 0.1 km. This is the first positive test of the magnetic paleogeobarometric method.

Magnetic Domain Observation on Melt-Spun Nd-Fe-B Ribbons Using Magnetic Force Microscopy

1999 ◽  
Vol 577 ◽  
Author(s):  
A. Gavrin ◽  
C. Sellers ◽  
S.H. Liouw
Keyword(s):  
Magnetic Force Microscopy ◽  
Magnetic Force ◽  
Magnetic Measurements ◽  
Magnetic Domain ◽  
Domain Size ◽  
High Coercivity ◽  
Uniform Domain ◽  
Cross Sectional ◽  
Force Microscopy ◽  
Melt Spun

ABSTRACTWe have used Magnetic Force Microscopy (MFM) to study the magnetic domain structures of melt-spun Nd-Fe-B ribbons. The ribbons are commercial products (Magnequench International, Inc. MQP-B and MQP-B+) with a thickness of approximately 20 microns. These materials have identical composition, Nd12.18B5.36Fe76.99Co5.46, but differ in quenching conditions. In order to study the distribution of domain sizes through the ribbon thickness, we have prepared cross-sectional samples in epoxy mounts. In order to avoid artifacts due to tip-sample interactions, we have used high coercivity CoPt coated MFM tips. Our studies show domain sizes typically ranging from 50-200 nm in diameter. This is in agreement with studies of similar materials in which domains were investigated in the plane of the ribbon. We also find that these products differ substantially in mean domain size and in the uniformity of the domain sizes as measured across the ribbon. While the B+ material shows nearly uniform domain sizes throughout the cross section, the B material shows considerably larger domains on one surface, followed by a region in which the domains are smaller than average. This structure is presumably due to the differing quench conditions. The region of coarse domains varies in thickness, disappearing in some areas, and reaching a maximum thickness of 2.75 µm in others. We also describe bulk magnetic measurements, and suggest that.

scholarly journals Studies on Cyanex-272 Complexes of Mg (II), Ca (II) and Fe (III)

1970 ◽  
Vol 42 (4) ◽  
pp. 475-482 ◽  
Author(s):  
M Badrul Islam ◽  
M Zahurul Haque ◽  
N Shamsul Islam
Keyword(s):  
Key Words ◽  
Magnetic Measurements ◽  
Phosphinic Acid ◽  
Chemical Properties ◽  
Decomposition Temperature ◽  
Complex Compounds ◽  
The Other ◽  
Spectral Studies ◽  
Cyanex 272 ◽  
Physico Chemical

Certain complex compounds were synthesized by the interaction of Mg(II), Ca(II) and Fe(III) halides with the solvent extracting reagent, Cyanex-272 i.e. bis (2,4,4- trimethylpentyl) phosphinic acid as ligand. All the prepared complexes have been characterized on the basis of their molar masses, conductivity, magnetic measurements and infrared and electronic spectral studies. The other physico-chemical properties e.g. colour, decomposition temperature have also been ascertained. Key words: Chanex-272 Bangladesh J. Sci. Ind. Res. 42(4), 475-482, 2007

XVII. Discussion of the observed deviations of the compass in several ships, wood-built and iron-built; with general tables for facilitating the examination of compass-deviations

1856 ◽  
Vol 7 ◽  
pp. 491-495
Keyword(s):  
Magnetic Force ◽  
Absolute Intensity ◽  
The Other ◽  
Angular Deviation ◽  
Vertical Force ◽  
Steel Bar ◽  
The Law

The author refers, in the first place, to his paper in the Philosophical Transactions for 1839, on the Disturbance of the Compass in Iron Ships, for a theory of the forces produced by the transient induced magnetism of iron. Using the term “polar-magnet-deviation” to express a deviation similar to that which would be produced by a magnetized steel bar partaking of the movements of the ship; and using the term “quadrantal deviation" for a deviation following the law of the sine of double the azimuth, and thus having, if “positive,” the signs + - + - in the four successive quadrants of azimuth, or, if “negative,” the signs - + - + in the four successive quadrants: then it appears that the deviation produced by the transient induced magnetism of a ship will consist of two parts; of which one will be a “polar-magnet-deviation," such as would be produced by a magnetized steel bar whose axis is parallel to the keel of the ship, and whose absolute intensity is proportional to the terrestrial vertical force at the place; and the other will be a “quadrantal deviation,” which, in angular deviation, will be absolutely the same in all magnetic latitudes and with all magnitudes of terrestrial magnetic force, and will usually be “positive.”

Field tests for ferrous iron and ferric-organic complexes (on exchange sites or in water-soluble forms) in soils

Soil Research ◽  
1981 ◽  
Vol 19 (2) ◽  
pp. 175 ◽  
Author(s):  
CW Childs
Keyword(s):  
Soil Sample ◽  
Field Test ◽  
Ferrous Iron ◽  
Ammonium Acetate ◽  
Field Tests ◽  
Water Soluble ◽  
Organic Ligands ◽  
The Other ◽  
Positive Test ◽  
Organic Complexes

A 1 M solution of ammonium acetate containing �, �-dipyridyl indicator is recommended for use in field tests for exchangeable and water-soluble ferrous iron in soils. In using the test, a soil sample may be added to a vial containing the solution, or the solution can be sprayed on to a freshly exposed soil face. A field test for ferric-organic complexes in soils, using the same vials, is proposed. This is based on the photochemical nature of the reduction of ferric to ferrous iron in the presence of oxidizable organic ligands. Two subsamples of soil are added to separate vials, and light is excluded from one. After 5-15 min, a positive test for ferrous iron in the vial exposed to light, and a negative test in the other, indicates the presence of ferric-organic complexes.

MAGNETIC SUSCEPTIBILITY OF YRh2

1993 ◽  
Vol 07 (01n03) ◽  
pp. 834-837
Author(s):  
H. YAMADA ◽  
W. STEINER
Keyword(s):  
Magnetic Susceptibility ◽  
Temperature Dependence ◽  
Density Of States ◽  
Phase Structure ◽  
Magnetic Measurements ◽  
Tight Binding ◽  
The Other ◽  
Spin Fluctuations ◽  
Tight Binding Method ◽  
Good Agreement

Magnetic measurements for YRh2 with the cubic Laves phase structure were performed between 4.2 and 600 K. It was observed that the susceptibility shows a very weak temperature dependence and our data are about 40 % larger than the observed one by Loebich and Raub. On the other hand, the temperature dependence of the susceptibility was also estimated theoretically, by using the density-of-states curve calculated in the tight-binding method and by taking into account the effect of spin fluctuations. A good agreement between our observed and calculated results is obtained.

A modeling study of augmenting coarse-grid 3D controlled-source electromagnetics with data from a towed receiver array

Geophysics ◽  
2016 ◽  
Vol 81 (1) ◽  
pp. E33-E42 ◽  
Author(s):  
Jan Petter Morten ◽  
Jean-Michael Poudroux ◽  
Rune Mittet
Keyword(s):  
Coarse Grid ◽  
The Other ◽  
Burial Depth ◽  
3D Inversion ◽  
Simultaneous Inversion ◽  
Controlled Source ◽  
Hydrocarbon Reservoir ◽  
Electromagnetic Data ◽  
Receiver Array ◽  
3D Geometry

We have considered the simultaneous 3D inversion of controlled-source electromagnetic data from a towed receiver array and a coarse grid of stationary seabed receivers. Our 3D synthetic model demonstrated the sensitivity and effect on imaging of towed and seabed receiver data. The short-offset data from the towed receivers at 1–3 km offset are effective at resolving a shallow resistor at a 400-m burial depth. On the other hand, the data from the stationary seabed receivers have less noise and will resolve the 3D geometry of resistive structures buried at the 1–2 km depths typical of a hydrocarbon reservoir. We have determined how the complementary sensitivity of data from the two receiver types can be used in simultaneous inversion to recover the shallow and deep resistors.

scholarly journals An experiment on electro-magnetic rotation

1876 ◽  
Vol 24 (164-170) ◽  
pp. 403-407
Keyword(s):  
Short Distance ◽  
Magnetic Force ◽  
Magnetic Polarity ◽  
The Other ◽  
Magnetic Rotation ◽  
Magnetic Pole ◽  
Left Handed ◽  
Spiral Form ◽  
Electro Magnetic ◽  
Made In

The phenomena of the rotation of movable conductors, carrying currents, about lines of magnetic force are well known. One form of experiment, commonly called the rotating spark, presents, beside the actual rotation, some peculiar features which do not appear to have been noticed in detail. The instrumental arrangements consist of a partially exhausted chamber with a platinum point for one terminal, a ring for the other, and the intervening air or other gas for the movable conductor. The chamber is made in the form of a double cylinder, so that a magnet inserted through the ring may reach nearly to the point. The discharge then passes between the point and the ring, and revolves about the magnet according to Ampere’s law. But beside the rotation, and even when, through weakening of the magnet, rotation does not actually take place, the spark, when carefully observed, is seen to assume a spiral form ; and the spiral is right-handed or left-handed according to both the direction of the current and the magnetic polarity. This effect is particularly noticeable if the magnetic pole be inserted only a short distance beyond the ring. The discharge is then seen to spread itself out sheetwise on the ring in the direction in which rotation would take place. The edge of the sheet is in the form of a helix.

Research on Electrical Characteristics of a Novel Balance Transformer with Asymmetrical Winding

2014 ◽  
Vol 536-537 ◽  
pp. 1523-1526 ◽  
Author(s):  
Yong Sheng Li ◽  
Yi Fa Sheng ◽  
Kai Yi Zhang ◽  
Bo Fan
Keyword(s):  
Magnetic Force ◽  
Short Circuit ◽  
Neutral Current ◽  
Force Balance ◽  
Analysis Method ◽  
Systematic Analysis ◽  
Negative Sequence ◽  
Transfer Equations ◽  
Zero Sequence ◽  
Negative Sequence Current

For problems of zero sequence current and negative sequence current of traction transformer in Electrified Railway, a novel balance transformer with asymmetrical windings was presented. By a systematic analysis method based on the magnetic force balance equations, winding connection equations, output-port equations and voltage transfer equations, the current relationships of the primary windings and secondary windings, the balance condition and the short circuit impedances (when the neutral current in the primary side is zero) were deduced, and the electric characteristics of the balance transformer was analyzed. Through the experimental model of balance transformer in simulation platform based on Matlab/Simulink, the electric characteristics of balance transformer and change law of zero sequence current and negative sequence current in different mode were researched. Correctness and feasibility of the theoretical analysis are verified through the simulation experiment.

scholarly journals Rappaport-Vassiliadis Medium for Recovery of Salmonellaspp. from Low Microbial Load Foods: Collaborative Study

2001 ◽  
Vol 84 (1) ◽  
pp. 65-84 ◽  
Author(s):  
Thomas S Hammack ◽  
R Miguel Amaguaña ◽  
Wallace H Andrews ◽  
S M Al-Hasani ◽  
R Asmundson ◽  
...  
Keyword(s):  
Guar Gum ◽  
Relative Effectiveness ◽  
Collaborative Study ◽  
Egg Yolk ◽  
Black Pepper ◽  
The Other ◽  
Microbial Load ◽  
Positive Test ◽  
Colony Forming Units ◽  
Dry Milk

Abstract Twenty-three laboratories participated in a collaborative study to compare the relative effectiveness of Rappaport-Vassiliadis (RV) medium incubated at 42°C, selenite cystine (SC) broth (35°C), and tetrathionate (TT) broth (35 and 43°C) for recovery of Salmonella from the following foods with a low microbial load: dried egg yolk, dry active yeast, ground black pepper, guar gum, and instant nonfat dry milk. For dry active yeast, lauryl tryptose (LT) broth, incubated at 35°C, was used instead of SC broth. All of the foods were artificially inoculated with single Salmonella serovars, that had been lyophilized before inoculation, at high and low target levels of 0.4 and 0.04 colony forming units/g food, respectively. For analysis of 870 test portions, representing all of the foods except yeast, 249 Salmonella-positive test portions were detected by RV medium, 265 by TT broth (43°C), 268 by TT broth (35°C), and 269 by SC broth (35°C). For analysis of 225 test portions of yeast, 79 Salmonella-positive test portions were detected by RV medium, 79 by TT broth (43°C), 84 by TT broth (35°C), and 68 by LT broth (35°C). RV medium was comparable to, or even more effective than, the other selective enrichments for recovery of Salmonella from all of the foods except guar gum. It is recommended that RV (42°C) and TT (35°C) be used with foods that have a low microbial load, except for guar gum for which SC (35°C) and TT (35°C) are recommended.

G-Networks with Signals and Batch Removal

1993 ◽  
Vol 7 (3) ◽  
pp. 335-342 ◽  
Author(s):  
Erol Gelenbe
Keyword(s):  
Petri Nets ◽  
Computer System ◽  
Stationary Solution ◽  
Queueing Networks ◽  
The Other ◽  
Parallel Computer ◽  
System Modelling ◽  
Network Stability ◽  
Batch Mode ◽  
Flow Equations

We consider queueing networks containing customers and signals that were recently introduced in Gelenbe [4]. Both customers and signals can be exogenous or can be obtained by a Markovian transition of a customer after service. A signal entering a queue forces a customer to move on to another queue according to a Markovian routing rule or to leave the network in batch mode. This synchronized or triggered motion is useful in representing the effect of tokens in Petri-nets, for systems in which customers and work can be instantaneously moved from one queue to the other on the arrival of a signal as well as for other network behaviors that are encountered in parallel computer system modelling. We show that this network has product form stationary solution and establish the non-linear customer flow equations that govern it. Network stability is discussed in this new context.

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