Environmental magnetic properties used to assess sediment sources and transport patterns in the muddy area along the Zhejiang coast, China

2020 ◽  
Vol 245 ◽  
pp. 106933
Author(s):  
Shuang Wang ◽  
Jian Liu ◽  
Jianchao Li ◽  
Lei Xu ◽  
Gang Xu ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Sediment Sources ◽  
Transport Patterns ◽  
Muddy Area

scholarly journals Tracing the origin of reservoir sediments using magnetic properties in Southeastern Brazil

2020 ◽  
Vol 41 (3) ◽  
pp. 847
Author(s):  
Pedro Luiz Terra Lima ◽  
Marx Leandro Naves Silva ◽  
John Quinton ◽  
Alona Armstrong ◽  
Alberto Vasconcellos Inda ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Soil Erosion ◽  
Control Strategies ◽  
Southeastern Brazil ◽  
Sediment Sources ◽  
Fe Oxide ◽  
Reservoir Sediments ◽  
Tropical Environments ◽  
Negative Impacts ◽  
Tracing Techniques

Determining the origin of eroded soil is essential to design effective soil erosion control strategies which preserve the soil resource, enhance agricultural productivity, and reduce the negative impacts of soil erosion, in-field and off-field. Magnetic properties have been widely used in temperate environments to identify sediment sources, pathways and links, but there have been very few applications in tropical and subtropical environments. Therefore, in this paper we investigated reservoir sediment sources in the Upper Grande River Basin, Southeastern Brazil, using sediment tracing techniques based on magnetic parameters (low and high frequency magnetic susceptibility, frequency dependent susceptibility). The different parent materials and subtropical weathering conditions resulted in soils having different Fe oxide minerals and Fe oxide contents, promoting magnetic variability that allowed comparison and identification of possible sources of reservoir sediments in order to reduce water erosion impacts. The results indicate the suitability of magnetic properties as a tracer for soil erosion studies in tropical environments.

Magnetic-properties of two soils during reduction, drying and re-oxidation

Soil Research ◽  
1995 ◽  
Vol 33 (4) ◽  
pp. 597 ◽  
Author(s):  
RH Crockford ◽  
IR Willett
Keyword(s):  
Magnetic Properties ◽  
Iron Oxides ◽  
Water Bodies ◽  
Sediment Sources ◽  
Chemical Changes

As part of a study of the use of magnetic properties to identify sources of sediments in water bodies for erosion studies, changes in the magnetic properties of two soils were determined during extended periods of reduction by saturation and during subsequent drying and oxidation. Mass magnetic properties rose during reduction and declined on re-oxidation. The results showed that a new magnetic compound was formed during reduction and then destroyed upon oxidation. These changes occurred in a soil which did not produce sulfides during reduction and the effects were little affected by amending the soil so that sulfides were formed. It was concluded that the compounds responsible for changes in magnetic properties were complex iron oxides rather than sulfides. Differences between the magnetic properties of wet and air dried samples were considered to be mainly due to physical rather than chemical changes. Therefore, when using magnetic properties as a tool for the identification of sediment sources, diagenesis and the effects of drying need to be taken into account.

AEM analysis of crystallization in Ti-based amorphous alloys

1983 ◽  
Vol 41 ◽  
pp. 270-271
Author(s):  
A.R. Pelton ◽  
A.F. Marshall ◽  
Y.S. Lee
Keyword(s):  
Magnetic Properties ◽  
Amorphous Alloys ◽  
Amorphous Materials ◽  
Isothermal Annealing ◽  
Amorphous Matrix ◽  
Nucleation And Growth ◽  
Current Interest ◽  
Amorphous Films ◽  
Electrical And Magnetic Properties

Amorphous materials are of current interest due to their desirable mechanical, electrical and magnetic properties. Furthermore, crystallizing amorphous alloys provides an avenue for discerning sequential and competitive phases thus allowing access to otherwise inaccessible crystalline structures. Previous studies have shown the benefits of using AEM to determine crystal structures and compositions of partially crystallized alloys. The present paper will discuss the AEM characterization of crystallized Cu-Ti and Ni-Ti amorphous films.Cu60Ti40: The amorphous alloy Cu60Ti40, when continuously heated, forms a simple intermediate, macrocrystalline phase which then transforms to the ordered, equilibrium Cu3Ti2 phase. However, contrary to what one would expect from kinetic considerations, isothermal annealing below the isochronal crystallization temperature results in direct nucleation and growth of Cu3Ti2 from the amorphous matrix.

Microstructure in soft magnetic E3 (S1, Al) (Sendust) alloys

1988 ◽  
Vol 46 ◽  
pp. 770-771
Author(s):  
June D. Kim
Keyword(s):  
Electron Microscopy ◽  
Magnetic Properties ◽  
Ternary Phase Diagram ◽  
Vertical Tube ◽  
Vacuum Induction Melting ◽  
Induction Melting ◽  
Soft Magnetic ◽  
Quenching Temperature ◽  
Thin Foils ◽  
Vertical Tube Furnace

Iron-base alloys containing 8-11 wt.% Si, 4-8 wt.% Al, known as “Sendust” alloys, show excellent soft magnetic properties. These magnetic properties are strongly dependent on heat treatment conditions, especially on the quenching temperature following annealing. But little has been known about the microstructure and the Fe-Si-Al ternary phase diagram has not been established. In the present investigation, transmission electron microscopy (TEM) has been used to study the microstructure in a Sendust alloy as a function of temperature.An Fe-9.34 wt.% Si-5.34 wt.% Al (approximately Fe3Si0.6Al0.4) alloy was prepared by vacuum induction melting, and homogenized at 1,200°C for 5 hrs. Specimens were heat-treated in a vertical tube furnace in air, and the temperature was controlled to an accuracy of ±2°C. Thin foils for TEM observation were prepared by jet polishing using a mixture of perchloric acid 15% and acetic acid 85% at 10V and ∼13°C. Electron microscopy was performed using a Philips EM 301 microscope.

Magnetic properties of new charge-transfer complexes based on manganese porphyrins

1997 ◽  
Vol 90 (3) ◽  
pp. 407-413
Author(s):  
MARC KELEMEN ◽  
CHRISTOPH WACHTER ◽  
HUBERT WINTER ◽  
ELMAR DORMANN ◽  
RUDOLF GOMPPER ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Charge Transfer ◽  
Charge Transfer Complexes ◽  
Manganese Porphyrins
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