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Author: National Electric Association Publisher: Rarebooksclub.com ISBN: 9781230051598 Category : Languages : en Pages : 114
Book Description
This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1897 edition. Excerpt: ...to the revolutions per second as a basis of comparison of dynamos without perceiving its true significance, and have called this ratio the mass factor. The fact seems to have been overlooked that the ratio of the induced volts to the revolutions per second is a constant, so long as the useful. lines per pole remain unaltered, being, in fact, what we have termed the induction factor. While the force factor and the so-called mass factor are one and the same thing, the latter is expressed in a way involving the idea of power and, consequently, of speed, while the former indicates the real nature of this ratio, showing that it is quite independent of speed, and, therefore, not a power unit at all, much less a mass unit, but a force unit. and the resistance of the motor 0.05 ohm; inserting these values in the equation, we find the induction factor to be 4.45, and the running current 130 amperes; the force factor is therefore 578 dynes. If p=i, and A = 200, there must be 2.22x10s lines per pole. Since the pull at the rim of the rope drum is 3,400 pounds, when running at 200 feet per second, this motor would develop about twenty horse-power; and if the elevator had to act always at this speed, it would be sufficient to describe the motor as a twenty-horsepower motor; but this would give no information as to the ability of the motor to accelerate, since, at the moment of starting, the horse-power is nothing. Example 4. A four-pole railway generator, with the armature parallel connected (giving P=1), has 440 conductors on the armature, with 16.1x10 lines per pole; the induction factor is seventy-seven, and the force factor for 600 amperes is 77x600=46.2 kilodynes; the output at 450 revolutions per minute is 46.2x7.5=346 kilowatts; the dynamo is a...
Author: National Electric Association Publisher: Rarebooksclub.com ISBN: 9781230051598 Category : Languages : en Pages : 114
Book Description
This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1897 edition. Excerpt: ...to the revolutions per second as a basis of comparison of dynamos without perceiving its true significance, and have called this ratio the mass factor. The fact seems to have been overlooked that the ratio of the induced volts to the revolutions per second is a constant, so long as the useful. lines per pole remain unaltered, being, in fact, what we have termed the induction factor. While the force factor and the so-called mass factor are one and the same thing, the latter is expressed in a way involving the idea of power and, consequently, of speed, while the former indicates the real nature of this ratio, showing that it is quite independent of speed, and, therefore, not a power unit at all, much less a mass unit, but a force unit. and the resistance of the motor 0.05 ohm; inserting these values in the equation, we find the induction factor to be 4.45, and the running current 130 amperes; the force factor is therefore 578 dynes. If p=i, and A = 200, there must be 2.22x10s lines per pole. Since the pull at the rim of the rope drum is 3,400 pounds, when running at 200 feet per second, this motor would develop about twenty horse-power; and if the elevator had to act always at this speed, it would be sufficient to describe the motor as a twenty-horsepower motor; but this would give no information as to the ability of the motor to accelerate, since, at the moment of starting, the horse-power is nothing. Example 4. A four-pole railway generator, with the armature parallel connected (giving P=1), has 440 conductors on the armature, with 16.1x10 lines per pole; the induction factor is seventy-seven, and the force factor for 600 amperes is 77x600=46.2 kilodynes; the output at 450 revolutions per minute is 46.2x7.5=346 kilowatts; the dynamo is a...
Author: Gyula Klima Publisher: Cambridge Scholars Publishing ISBN: 1527540146 Category : Philosophy Languages : en Pages : 130
Book Description
This volume considers the Aristotelian virtue-ethics tradition as it develops in the writings of Thomas Aquinas. Part One studies the types of virtues Aquinas believes are held by Christians in a state of grace. Aquinas’s intriguing account is apparently fraught with inconsistencies, which have split contemporary interpreters over not only how to understand Aquinas on this matter, but also as to whether it is even possible to provide a consistent interpretation of his doctrine. This book brings together scholarship that reflects the various sides of the debate. Part Two explores a Thomistic synthesis regarding Aquinas’s account of the good as telos or end that emerges in the seventeenth century, as well as what promise his virtue ethics holds today, arguing that Aquinas’ hylomorphic understanding of human beings as matter-form composites furnishes a robust moral accounting that seems unavailable to alternative, reductive materialist accounts.
Author: Huang Yunhui Publisher: VSP ISBN: 9789067642668 Category : Science Languages : en Pages : 310
Book Description
This book is a collection of papers presented in the 30th International Geological Congress, held in Beijing, on mineralogy. The papers deal with topics on fine structures and crystallographic orientations in biogenic magnetite and thermodynamic properties of minerals.
Author: Yogi Goswami Publisher: Taylor & Francis ISBN: 131774084X Category : Technology & Engineering Languages : en Pages : 532
Book Description
'Essential for any serious technical library' Professor Martin Green, University of New South Wales, Australia The Advances in Solar Energy series offers state-of-the-art information on all primary renewable energy technologies, including solar, wind and biomass, bringing together invited contributions from the foremost international experts in renewable energy. Volume 16 is the first volume to be published by Earthscan. Topics covered include: * Anthropogenic global warming: evidence, predictions and consequences * Comparing projections of PV generation ad European and U.S. domestic oil production * Recent advances in solar PV technology * III-V compound multi-junction and concentrator solar cells * Progress of highly reliable crystalline Si solar devices and materials * Recent advances in parabolic trough solar power plant technology * Solar pond technologies: a review and future directions * Passive cooling of buildings * Renewable solar energy for traveling: air, land and water * Modeling solar hydrogen fuel cell systems * Renewable energy for the Russian economy * An innovative, high temperature and concentration solar optical system at the turn of the 19th Century: the Pyreheliophoro Spanning a broad range of technical subjects, this volume and series is a 'must-have' reference on global developments in the field of renewable energy, suitable for solar energy experts (including engineers and architects), utilities and industry professionals, students, teachers and researchers in renewable energy, technical libraries and laboratories.
Author: Lawrence W. Kessler Publisher: Springer Science & Business Media ISBN: 1461307252 Category : Science Languages : en Pages : 642
Book Description
This book contains the technical papers presented at the 16th International Symposium on Acoustical Imaging which was held in Chicago, Illinois USA from June 10-12, 1987. This meeting has long been a leading forum for acoustic imaging scientists and engineers to meet and exchange ideas from a wide range of disciplines. As evidenced by the diversity of topical groups into which the papers are organized, participants at the meeting and readers of this volume can benefit from developments in medical imaging, materials testing, mathematics, microsocopy and seismic exploration. A common denominator in this field, as its name implies, is the generation, display, manipulation and analysis of images made with mechanical wave energy. Sound waves respond to the elastic properties of the medium through which they propagate, and as such, are capable of characterizing that medium; something that cannot be done by other means. It is astonishing to realize that acoustic wave imaging is commonly performed over about eight decades of frequency, with seismology and microscopy serving as lower and upper bounds, respectively. The physics is the same, but the implementations are quite different and there is much to learn. The conference chairman and editor wishes to express his appreciation to those who helped run the symposium - namely the Technical Review COIIII1ttee and Session Cbair:aen including Floyd Dunn, Gordon S.
Author: Lake Superior Mining Institute Publisher: Rarebooksclub.com ISBN: 9781230047003 Category : Languages : en Pages : 80
Book Description
This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1911 edition. Excerpt: ...tube, by testing tubes at known angles according to the method described by Mr. Jopling. Figure 4 shows a curve for i Y%" tubes. It will be noted that for these larger tubes the correction is only 3% at 45, which is the maximum. The angle can be read to y2 and I feel certain that the results of tests for inclination can be relied upon to within 1. To determine the course of the hole, the tube is placed in the goniometer with the graduated circle set at 0 so that the tube is vertical. If the inclination of the hole is steep the tube is twisted until the etching shows the dip to be either directly toward or away from the eye; that is, until the crossthread bisects the ellipse etched on the glass. If the inclination is shallow it is more accurate to twist the tube so that the dip is to the right or left of the observer and in the plane of the graduated circle. The goniometer is next placed on a protractor so that the tube comes vertically over the center, and by sighting down over a straight edge placed in line with the North and South points marked on the tube the point of the compass towards which the hole dips may be determined. Figures 3 and 5 show tubes with acid, gelatine, compass, and North and South points marked, just as they are taken from the drill hole. I intend to have another goniometer made with-horizontal circle to measure the course as well as vertical circle for the inclination, but have not bad an opportunity to do so as yet. We have found the method described above very successful, and two tests at the same point almost always agree. When this is not the case more tests are made and so far we have always been able to ascertain which are wrong. We have made tests at a depth of 2000', but it would probably be difficult...
Author: Xin-She Yang Publisher: Springer Nature ISBN: 9811623775 Category : Technology & Engineering Languages : en Pages : 982
Book Description
This book gathers selected high-quality research papers presented at the Sixth International Congress on Information and Communication Technology, held at Brunel University, London, on February 25–26, 2021. It discusses emerging topics pertaining to information and communication technology (ICT) for managerial applications, e-governance, e-agriculture, e-education and computing technologies, the Internet of things (IoT) and e-mining. Written by respected experts and researchers working on ICT, the book offers a valuable asset for young researchers involved in advanced studies. The book is presented in four volumes.
Author: National Electric Association
Author: National Electric Association
Author: Gyula Klima
Author: American Railway Association Signal
Author: American Concrete Institute
Author: Huang Yunhui
Author: Yogi Goswami
Author: Lawrence W. Kessler
Author: Patristic, Mediaeval and Renaissance Conference. 16, 1992, Villanova, Pa..
Author: Lake Superior Mining Institute
Author: Xin-She Yang