SOME CALCULATIONS OF FIELD STRENGTH DISTRIBUTION IN THE VERTICAL PLANE OF DOUBLE-TAPERED MASTS

1935 ◽  
Vol 13a (3) ◽  
pp. 60-71
Author(s):  
K. A. MacKinnon
Keyword(s):  
Field Strength ◽  
Cross Section ◽  
Current Distribution ◽  
Vertical Plane ◽  
Field Measurements ◽  
Strength Distribution ◽  
The Self ◽  
Uniform Cross Section ◽  
The Cross

The approximate current distribution with height in vertical tower antennae of non-uniform cross section is calculated by assuming that the cross section is that of a cylinder whose diameter changes discontinuously. The field strength distribution in the vertical plane is then calculated for this current distribution and compared with field measurements of Ballantine. This is repeated using the experimentally determined current distribution of Gihring and Brown which results in a much closer check with Ballantine's measurements.The results were then used to calculate the field strength distribution in the vertical plane of an array comprising a 0.597λ vertical double-tapered tower as radiator, and a 0.250λ vertical tower of the self-supporting type as a fed reflector.

Deflection of Beams of Varying Cross Section

1937 ◽  
Vol 4 (2) ◽  
pp. A49-A52
Author(s):  
Miklós Hetényi
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Original Problem ◽  
New Method ◽  
Constant Cross Section ◽  
Deflection Curve ◽  
Force System ◽  
Uniform Cross Section ◽  
The Cross

Abstract This paper calls attention to a new method of dealing with deflections of beams, the cross sections of which vary by steps. It is shown that the effect of this variation on the shape of the deflection curve can be represented by a properly chosen force system acting on a beam of uniform cross section. There is no approximation involved in this substitution, whereby the original problem is reduced to one of computing deflections of beams of constant cross section.

The Centre of Shear of Aerofoil Sections

1953 ◽  
Vol 57 (508) ◽  
pp. 235-237 ◽  
Author(s):  
John A. Jacobs
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Lateral Surface ◽  
The Other ◽  
Principal Axes ◽  
Unstrained State ◽  
Uniform Cross Section ◽  
Single Force ◽  
The Cross ◽  
Fixed End

Consider a cantilever beam of uniform cross section whose generators are parallel to the z-axis and whose lateral surface is free from surface tractions. The line of centroids of the cross sections in the unstrained state is taken as the z-axis, and the x- and y-axes are the principal axes of the cross section at the centroid of the fixed end z = 0.The other end of the beam (z = l) is subject to forces which reduce to a single force with components (Wx, Wv, 0), transverse to the z-axis, acting through the load point L of this end section (see Fig. 1). The co-ordinates of L are taken as (p, q, l).

EXPERIMENTAL COMPARISON OF SHUNT- AND SERIES-EXCITATION OF A HIGH, UNIFORM CROSS-SECTION, VERTICAL RADIATOR

1939 ◽  
Vol 17a (12) ◽  
pp. 227-236
Author(s):  
K. A. MacKinnon
Keyword(s):  
Field Strength ◽  
Cross Section ◽  
Experimental Comparison ◽  
Similar Work ◽  
Uniform Cross Section ◽  
Remote Points

This paper presents the results of experiments with shunt- and series-excitation of a 0.55 wave, uniform cross-section, vertical radiator. Both unattenuated field strength at one mile and fading characteristics at remote points were determined for each mode of excitation. Whilst Morrison and Smith have already done similar work with a non-uniform cross-section tower, this is the first attempt to examine the fading of a uniform cross-section tower excited in the two modes.

scholarly journals Measurements of the absolute indices of refraction in strained glass

1910 ◽  
Vol 83 (566) ◽  
pp. 572-579 ◽  
Keyword(s):  
Plane Wave ◽  
Cross Section ◽  
Rectangular Cross Section ◽  
Vertical Plane ◽  
Bending Moment ◽  
The Other ◽  
Double Refraction ◽  
Light Passing ◽  
The Absolute ◽  
The Cross

1. In June, 1907, the author described a method by which the double-refraction in strained glass could be measured by observing the deviation of a ray of light passing through a slab of glass under flexure. If a slab or beam of glass of rectangular cross-section be bent in a vertical plane under a bending moment M, and if a plane wave be transmitted through the glass in a direction perpendicular to the plane of flexure, the light is broken up into two components, one polarised horizontally ( i. e . perpendicular to the cross-section and along the line of stress) and the other vertically.

Analysis on Sea Bed Evolution around Caofeidian Harbour

2011 ◽  
Vol 90-93 ◽  
pp. 2665-2669
Author(s):  
Yu Zhang ◽  
Xiao Ming Sun ◽  
Cui Ping Kuang ◽  
Ling Deng
Keyword(s):  
Cross Section ◽  
Water Depth ◽  
Field Survey ◽  
Great Influence ◽  
Field Measurements ◽  
Sea Bed ◽  
Bed Evolution ◽  
The Cross

Caofeidian reclamation work may have great influence on the hydrodynamic enviorment. Based on the four-year field survey on water depth, the batymetric maps of different years of Caofeidian are obtained. Through annalying field measurements, a series of comparisons of topography changes in cross section and profile sections are made. Because of the intensed promontory effects, the scour intensity is fierce near the cape but weak with the distance from the cape in the cross-section direction.

A New Approach to the Demonstration of Oxidase-Localization Using Tannic Acid Or Catechin

1973 ◽  
Vol 31 ◽  
pp. 698-699
Author(s):  
V. Mizuhira ◽  
Y. Futaesaku
Keyword(s):  
Cross Section ◽  
Tannic Acid ◽  
Elastic Fiber ◽  
The Other ◽  
New Approach ◽  
Tissue Block ◽  
Active Reaction ◽  
The Cross

Previously we reported that tannic acid is a very effective fixative for proteins including polypeptides. Especially, in the cross section of microtubules, thirteen submits in A-tubule and eleven in B-tubule could be observed very clearly. An elastic fiber could be demonstrated very clearly, as an electron opaque, homogeneous fiber. However, tannic acid did not penetrate into the deep portion of the tissue-block. So we tried Catechin. This shows almost the same chemical natures as that of proteins, as tannic acid. Moreover, we thought that catechin should have two active-reaction sites, one is phenol,and the other is catechole. Catechole site should react with osmium, to make Os- black. Phenol-site should react with peroxidase existing perhydroxide.

Energy Distribution in Electron Beams

1972 ◽  
Vol 30 ◽  
pp. 568-569
Author(s):  
Tamotsu Ohno
Keyword(s):  
Electron Beam ◽  
Energy Distribution ◽  
Cross Section ◽  
Integral Curve ◽  
Electron Beams ◽  
Electron Gun ◽  
Angular Divergence ◽  
Apparent Increase ◽  
Integral Width ◽  
The Cross

The energy distribution in an electron; beam from an electron gun provided with a biased Wehnelt cylinder was measured by a retarding potential analyser. All the measurements were carried out with a beam of small angular divergence (<3xl0-4 rad) to eliminate the apparent increase of energy width as pointed out by Ichinokawa.The cross section of the beam from a gun with a tungsten hairpin cathode varies as shown in Fig.1a with the bias voltage Vg. The central part of the beam was analysed. An example of the integral curve as well as the energy spectrum is shown in Fig.2. The integral width of the spectrum ΔEi varies with Vg as shown in Fig.1b The width ΔEi is smaller than the Maxwellian width near the cut-off. As |Vg| is decreased, ΔEi increases beyond the Maxwellian width, reaches a maximum and then decreases. Note that the cross section of the beam enlarges with decreasing |Vg|.

Research in the cross-section of community psychology and global climate change: A call for action

2009 ◽  
Author(s):  
Marci Culley ◽  
Holly Angelique ◽  
Courte Voorhees ◽  
Brian John Bishop ◽  
Peta Louise Dzidic ◽  
...  
Keyword(s):  
Climate Change ◽  
Cross Section ◽  
Global Climate Change ◽  
Community Psychology ◽  
Global Climate ◽  
The Cross
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