Microwave Horns and Feeds

6.4.3 Design of pyramidal horns The curves given in Figures 6.14 and 6.15 can be used to design pyramidal horns . Detailed information is given by Milligan [ 13 ] , Love [ 12 ] and Balanis [ 9 ] . At first sight , it appears as if the E ...

Author: A. David Olver

Publisher: IET

ISBN: 9780780311152

Category: Technology & Engineering

Page: 504

View: 531

This monograph is devoted to the theory, design, performance and application of microwave horns and feeds for reflector antennas. It is a collaboration between the microwave antenna group at Queen Mary and Westfield College and the electromagnetic group at the University of Winnipeg, Canada.

Horns Tusks and Flippers

In his Natural History , Pliny the Elder writes that the unicornis was " the born enemy of the elephant that sharpens its horn on a stone and in combat aims at the elephant's belly , knowing well that it is soft .

Author: Donald R. Prothero

Publisher: JHU Press

ISBN: 9780801871351

Category: Nature

Page: 334

View: 942

Since the extinction of the dinosaurs, hoofed mammals have been the planet's dominant herbivores. Native to all continents except Australia and Antarctica, recent paleontological and biological discoveries have deepened understanding of their evolution. This text reveals their evolutionary history.

The Tootler s Tutorial History Horns and Calls

The serious horn player wants a good horn, and if he cannot find one the only possibility left is to have one made. There are many brass instrument manufacturers, but only a few take on special orders. One such man who specializes in ...

Author: Grace Yaglou

Publisher: Carriage Assoc. of America

ISBN:

Category: Music

Page: 33

View: 458

Grace Yaglou has researched many horn calls, and has collected a variety of horns used on coaches. She is considered an authority on coach horns and post horns, and has sounded these horns. It is her hope to see others continue to sound the calls of our past and to create their own unique and individual calls.

Horns Pronghorns and Antlers

The prongs of the horn sheaths were approximately 10 cm above the animal's nose. (Photograph by DeWayne Williams.) the territory for three years, three does with horns bent forward, apparently his offspring, occupied his territory.

Author: George A. Bubenik

Publisher: Springer Science & Business Media

ISBN: 1461389666

Category: Science

Page: 562

View: 891

Since the first drawings left on walls of ancient caves, human beings have been fascinated with that unique phenomenon of the animal kingdom, the presence of horns and antlers. From the mythical ''unicorn'' exercising the power over life and death to the perceived aphrodisiacal and other medical properties of rhinoceros horns and growing antlers, these conspicuous protuberances have had a significant place in the history of mankind. Part of that ancient interest in antlers and horns was due to their value as sym bols of masculinity; this interest persists today in trophy hunting, an honorable tradition carried on for centuries in many countries of the world. This book, which deals with evolution, morphology, physiology, and behavior, has not been devised as a comprehensive review of the subject of horns, prong horns, and antlers; rather, it is a series of chapters stimulating thoughts, discus sions, and initiation of new studies. As editors, we did not interfere with the content of articles nor with the opin ions and interpretations of our contributors, and we left them to decide whether to accept the suggestions of our reviewers. Despite the fact that various aspects of cranial appendages have been studied since the end of the eighteenth century, many controversial views still exist, as witnessed in various chapters of this book.

Horns and Trumpets of the World

Many ivory horns, though only one in my own collection, are decorated with bands of leather, snake, or lizard skin, or of woven plant material. Relief carving on tusks is common in many parts of Africa, but these are usually tusks for ...

Author: Jeremy Montagu

Publisher: Rowman & Littlefield

ISBN: 0810888823

Category: Music

Page: 256

View: 188

Humanity has blown horns and trumpets of various makes and models, lengths and diameters since prehistoric times. In Horns and Trumpets of the World, the eminent scholar Jeremy Montagu surveys the vast range in time and type of this instrument that has accompanied everything in human history from the war cry to the formal symphony, from the hunting call to the modern jazz performance. No work on this topic offers as much detail or so many illustrations—over 150, in fact—of this remarkable instrument. Montagu’s examination looks at horns constructed from seaweed, cane, bamboo, shell, wood, ivory, and metal and encompasses instruments of the Bible, from the Bronze and Iron Ages, the Medieval, Renaissance, Baroque, and Classical periods, and, following the Industrial Revolution, the modern era.


Pennsylvania Deer and Their Horns

Among the older generation of hunters in Pennsylvania, a type of deer called the "Blue Horn" was well known. Its horns were a violet or blue in color, and the animal itself in winter grew a coat that was more blue than dark gray.

Author: Henry W. Shoemaker

Publisher: Penn State Press

ISBN: 0271045019

Category: Nature

Page: 222

View: 648


Skulls Antlers and Horns

... and HORNS Understanding the Natural History of Animals Photo by William Dean , BLM Horns , on the other hand , are not shed , usually do not branch , and are found on both males and females . The males , such as this billy goat ...

Author: John VanNiel

Publisher:

ISBN:

Category: Nature conservation

Page: 112

View: 615


Wind tunnel Investigation of Rounded Horns and of Guards on a Horizontal Tail Surface

The results indicate that rounding the adjacent horn and stabilizer edges caused negligible changes in the aerodynamic characteristics , except for the changes resulting from the decrease in the area moment of the horn .

Author: Robert B. Liddell

Publisher:

ISBN:

Category: Aerodynamics

Page: 124

View: 120

Summary: An investigation was made to determine the aerodynamic effects of horn balances with various plan forms and of guards on a horizontal tail surface. The results indicate that rounding the adjacent horn and stabilizer edges caused neglibible changes in the aerodynamic characteristics, except for the changes resulting from the decrease in the area momeent of the horn. The use of guards mounted between the stabilizer and horn was found to increase the slope of the lift curves with angle of attack or with elevator deflection. The negative slopes of the curves of hinge moment against angle of attack and elevator deflection increased as the guard area was increased.

The History of Improved Short horn Or Durham Cattle and of the Kirklevington Herd from the Notes of Thomas Bates With a Memoir by Thomas Bell With Plates Including a Portrait

THE QUALITIES OF MONGREL AND PURE - BRED SHORT - HORNS DISCUSSED , AND THE VALUE OF EACH COMPARED . Coarse - beefed Short - horns Described -- Mr . Cilley's Evidence as to the Introduction of Coarse Dutch Animals - Hubback's Influence ...

Author: Thomas BELL (of Brockton House, Eccleshall.)

Publisher:

ISBN:

Category:

Page: 422

View: 169