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Friday, July 24, 2020 | History

2 edition of effect of an earth of finite conductivity on the properties of an H.F. aerial found in the catalog.

effect of an earth of finite conductivity on the properties of an H.F. aerial

J. L. Nicol

effect of an earth of finite conductivity on the properties of an H.F. aerial

by J. L. Nicol

  • 334 Want to read
  • 2 Currently reading

Published by North Queensland, James Cook University of North Queensland in Townsville .
Written in English

    Subjects:
  • Radio -- Antennas.,
  • Radio waves.

  • Edition Notes

    Bibliography: l. [48-51]

    Statementby J. L. Nicol.
    SeriesNatural philosophy research report,, no. 12
    ContributionsRoyal Flying Doctor Service of Australia.
    Classifications
    LC ClassificationsTK6565.A6 N46
    The Physical Object
    Pagination47 [29] l.
    Number of Pages47
    ID Numbers
    Open LibraryOL5465032M
    LC Control Number73167814

      This chapter presents the importance of geotechnical engineering on the site selection, design, construction, operation, and maintenance of earth-rock dams and earth structures; it emphasizes the geotechnical engineering work related to dam safety during the operation stage. Preliminary geological studies required to select the best dam site are . Description. This global electromagnetic resonance phenomenon is named after physicist Winfried Otto Schumann who predicted it mathematically in Schumann resonances occur because the space between the surface of the Earth and the conductive ionosphere acts as a closed limited dimensions of the Earth cause this waveguide to act as a .

    Despite massive landscapes and endless blue, our planet is limited in its resources and capabilities to support its inhabitants. According to the Global Footprint Network, "Humanity uses the equivalent of planets to provide the resources we use and absorb our means it now takes the Earth one year and six months to regenerate what we use in a year. Transient electromagnetic method (TEM) is an important tool to obtain the electric properties in near-surface detection. The method can be used in the scenarios of land, marine and airborne.

    Effect of rare earth elements (Er, Ho) on semi-metallic materials (ScN) in an applied electric field Hyunjung Kima, Yeonjoon Parka, Glen C. Kingb, Kunik Leec, and Sang H. Choib aNational Institute of Aerospace, Hampton, VA USA bNASA Langley Research Center, Hampton, VA USA cFederal Highway Administration, McLean, VA ABSTRACT The . vector, q, is define by Fourier’s Conduction Law, as the thermal conductivity, k, times the negative of the temperature In finite element analysis, all surfaces default to perfect insulators unless you give a specified temperature, a known heat influx, a convection condition, or a radiation condition. The thermal material properties.


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Effect of an earth of finite conductivity on the properties of an H.F. aerial by J. L. Nicol Download PDF EPUB FB2

Journal of Crystal Growth 83 () North-Holland, Amsterdam EFFECTS OF THE FINITE ELECTRICAL CONDUCTIVITY OF THE CRYSTAL ON HYDROMAGNETIC CZOCHRALSKI FLOW 51 W.E.

LANGLOIS IBM Almaden Research Center, Harry Road, San Jose, CaliforniaUSA and L.N. HJELLMING and J.S. WALKER Department of Cited by: In Handbook of Petroleum Exploration and Production, Skin discussion.

For a finite conductivity fracture, the skin is defined by two terms (Cinco-Ley and Samaniego-V, ): the geometrical skin S HKF assuming an infinite conductivity fracture (Equation ), and a correction parameter G to account for the pressure losses resulting from the low fracture conductivity.

The earth media has a conductivity of σ 0 and an intrinsic propagation constant of γ 0 = μ ω (j σ 0 − ω ε e), where j is the square root of -1, ω the operating angular frequency, μ the permeability of the earth or air, and ε e the earth dielectric by: 4. Thermal-Electric Finite Element Analysis and Experimental Validation of Bipolar Electrosurgical Cautery J.

Manuf. Sci. Eng (April, ) Erratum: “Measuring Thermal and Thermoelectric Properties of One-Dimensional Nanostructures Using a Microfabricated Device” [Journal of Heat Transfer,(5), pp.

–]Cited by: 8. This review summarizes recent results of electrical resistivity studies of the earth's crust and upper mantle. Where available, the data are discussed in the context of further regional geophysical information.

Electrical resistivity is very sensitive to a wide range of petrological and physical parameters, e.g., to carbon, fluids, volatiles and enhanced temperatures, making Cited by:   Finite element model is developed to predict the thermal conductivity of fabric.

• Thermal conductivity of fabric can be calculated by using air as fluid matrix. • Thermal conductivity increases with the increase of fibre volume fraction of fabric. • Radiation can be neglected in the analysis for small temperature difference.

EFFECTS OF FINITE WALL CONDUCTIVITY ON FLOW STRUCTURES IN NATURAL CONVECTION E. Leonardi1, T.A. Kowalewski2, V. Timchenko1, G. de Vahl Davis1 1University of New South Wales, Sydney, Australia 2IPPT PAN, Polish Academy of Sciences, PL Warsaw, Poland ABSTRACT Natural convection in a box is driven by the thermal.

formulation of electromagnetic fields above the earth surface taking into account the finite and infinite conductivity of the ground- which has the advantages of being reasonably fast to compute, secondly to investigate the effect of ground properties on the electric field intensity.

For this purpose we have. Electrical conductivity of earth materials is influenced by the metal content (sulfides) in the rock, porosity, clay content, permeability, and degree of pore saturation. Metal Content All metal objects of interest in contaminated site assessments have a very large conductivity contrast with their surroundings and can usually be readily.

Conductivity and Relative Permittivity Importance of Dielectric Properties of Tissue Theory of Homogeneous Dielectrics The dielectric permittivity (ε) and conductivity (σ) of a material are, respectively the charge and the current densities induced in the response to an applied electric field of unit amplitude.

It can be. Fernberg et al.: Earth conductivity effects on pipelines 26 Figure 1. Therefore, non-uniform geoelectric fields are likely to be Fig. Two schemes of PSP modelling. The bottom scheme takes into account the non-uniform (2-dimensional) geological conductivity variations along the pipeline route.

Whaler, ). The ground conductivity in land regions is rarely below mho/m while the equivalent conductivity of the ionosphere at VLF is – mho/m.

Earth detachment of the important modes of low order tends to decrease the influence of the ground. Earth impedances of aerial power-lines usually are calculated through methods and approximate formulas based on the Carson integral.

the importance of the ground finite conductivity is. We can then build up a finite-element scheme that consists of dividing the solid into polygonal elements of finite size. Material properties, such as K, ρc and Q are assigned to each element (note that K is the coordinate-aligned orthotropic thermal conductivity, K ̃ = K x 0 0 K y).

The boundary conditions are applied to the external elements. Finite element formulations of linear heat conduction problems have been given by Wilson and Nickell.

and Becker and Parr.2 Nickell and Sackman developed a finite element formulation of the coupled thermoelastic problem by using appropriate variational principles developed using Gurtin's work5 as a guide. The effect of finite electrical and thermal conductivities on magnetic buoyancy in a rotating gas: Authors: Magnetohydrodynamic Stability, Rotating Fluids, Thermal Conductivity, A Stars, Coriolis Effect, Electrical Properties, Field Strength, Free Vibration, Hydrostatic Pressure, Interstellar Magnetic Fields, Isotherms, Stellar Atmospheres.

Changes in the surface properties of the material were detected before and after the load using a digital holographic microscope and a digital height correlation method.

In this study, this technique was applied in combination with finite element analysis using a. The total thermal conductivity (lattice plus radiative) of several important earth materials is measured in the temperature range °–°K.

A new technique is used in which a CO 2 laser generates a low‐frequency temperature wave at one face of a small disk‐shaped sample, and an infrared detector views the opposite face to detect the.

[Show full abstract] to lines in free space, to single-wire lines above earth of finite conductivity (earth-return lines), and to multiple lines above earth of finite conductivity. The current. thermal conductivity. The model was able accurately to predict the average thermal conductivity of standard pitch-based carbon/ carbon composites.

The model was also used to study the effect of different composite architectures on the bulk thermal conductivity. The effects of fiber morphology, fiber/matrix interface, and the ratio of transverse.

A finite element method which incorporates the effect of microstructural characteristics such as filler aspect ratio, interfacial thermal resistance, volume fraction, and filler and fiber dispersion to determine the effective thermal conductivity of a composite with. The effect of introducing the rare-earth element Ce, on the thermal conductivity (TC) of the SiC/Al composites, was investigated.

The results showed that the introduction of Ce improved the TC of the SiC/Al composites; the TC of the .The effect of singularity removal for a Schlumberger sounding, where two current sources are located at (0, −, 0 m) and (0,0 m), respectively.

Part (a) shows a cube model buried in a two-layered earth and (b) the DC apparent resistivity ρ a versus half of the electrode distance of a Schlumberger sounding (AB/2). The improved.