Thermo-Electro-Magnetic Convection in Electrically Conductive Ferrofluids

Abstract An interface crack between two semi-infinite piezoelectric/piezomagnetic spaces under out-of-plane mechanical load and in-plane electrical and magnetic fields parallel to the crack faces is considered. Some part of the crack faces is assumed to be electrically conductive and having uniform distribution of magnetic potential whilst the remaining part of the crack faces is electrically and magnetically permeable. The mechanical, electrical, and magnetic factors are presented via functions which are analytic in the whole plane except the crack region. Due to these representations the combined Dirichlet-Riemann and Hilbert boundary value problems are formulated and solved in rather simple analytical form for any relation between conductive and permeable zone lengths. Resulting from this solution the analytical expressions for stress, electric and magnetic fields as well as for the crack faces displacement jump are presented. The singularities of the obtained solution at the crack tips and at the separation point of the mention zones are investigated and the formulas for the corresponding intensity factors are presented. The influence of external electric and magnetic fields upon the mechanic, electric and magnetic quantities at the crack region are illustrated in graph and table forms.

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A Study on Electro-Magnetic Properties of Concrete by Using Steel Fiber and Graphite

IOP Conference Series Earth and Environmental Science ◽

10.1088/1755-1315/889/1/012073 ◽

2021 ◽

Vol 889 (1) ◽

pp. 012073

Author(s):

Abhishek Verma ◽

Jagdeep Singh Gahir

Keyword(s):

Electromagnetic Waves ◽

Steel Fiber ◽

Control Sample ◽

Fiber Content ◽

Fiber Reinforced Concrete ◽

Steel Fibers ◽

Steel Fiber Reinforced Concrete ◽

Electrically Conductive ◽

Concrete Mix ◽

Electro Magnetic

Abstract This research paper describes the properties of electromagnetism of concrete mix that are sustained to make “Electrically Conductive Concrete”. Thus, the values provide various information on the behaviour of concrete mix and its relation with electromagnetic waves. Steel Fiber and Graphite are conductive materials. The properties of conductive concrete mix that is coarse aggregates, sand and cement can be measured. In the physical significance, the data calculated in X-ray diffraction and Scanning Electronic Microscope was discussed. The contact between the Steel Fiber and graphite is improved to make electrically conductive concrete. The strength is gained continuously till 3% where the maximum strength is gained which is 9.77% higher than the strength achieved by controlled sample. The control sample achieved 26.60MPa, with addition of 1% steel fibers the concrete achieved 29.40MPa, further increase in steel fiber content to 2% gained higher strength of 30.50MPa. The maximum compressive strength of 31.50MPa was achieved with the addition of 3% steel fibers. Further increase in steel fiber content resulted in decrease in strength, though 4% steel fiber reinforced concrete achieved 30.70MPa

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Electrical properties of conductive fabrics for operating capacitive touch screen displays

Textile Research Journal ◽

10.1177/0040517512464298 ◽

2012 ◽

Vol 83 (4) ◽

pp. 329-336 ◽

Cited By ~ 1

Author(s):

Jihyun Bae ◽

Kyung Hwa Hong

Keyword(s):

Touch Screen ◽

Electrical Characteristics ◽

Static Charge ◽

Electrically Conductive ◽

Conductive Materials ◽

The Core ◽

Different Types ◽

Spun Yarns ◽

Potential Applications ◽

Electro Magnetic

Electrically conductive textiles have many potential applications, such as sensors, static charge dissipation, and electro-magnetic interference shields. In this study, two different types of core spun yarns were produced with silver-plated nylon filaments as the conductive material. The electrical characteristics of the core spun yarns and the fabric samples knitted with these yarns were investigated. It was clear that the surface resistance of each type of knitted fabric depends on the surface exposure of the conductive materials. However, both knit types exhibited reasonable features for application as a touching operator for capacitive touch screen panels.

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Cryogenic atomic force microscopy

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100084570 ◽

1991 ◽

Vol 49 ◽

pp. 54-55

Author(s):

K. A. Fisher ◽

M. G. L. Gustafsson ◽

M. B. Shattuck ◽

J. Clarke

Keyword(s):

Room Temperature ◽

Rapid Freezing ◽

Cryogenic Temperatures ◽

Soft Or ◽

Electrically Conductive ◽

Force Microscopy ◽

Flexible Molecules ◽

Advantages And Disadvantages ◽

Atomic Force ◽

Chemical Perturbation

The atomic force microscope (AFM) is capable of imaging electrically conductive and non-conductive surfaces at atomic resolution. When used to image biological samples, however, lateral resolution is often limited to nanometer levels, due primarily to AFM tip/sample interactions. Several approaches to immobilize and stabilize soft or flexible molecules for AFM have been examined, notably, tethering coating, and freezing. Although each approach has its advantages and disadvantages, rapid freezing techniques have the special advantage of avoiding chemical perturbation, and minimizing physical disruption of the sample. Scanning with an AFM at cryogenic temperatures has the potential to image frozen biomolecules at high resolution. We have constructed a force microscope capable of operating immersed in liquid n-pentane and have tested its performance at room temperature with carbon and metal-coated samples, and at 143° K with uncoated ferritin and purple membrane (PM).

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