Scientific American, July, 1956

Total Page:16

File Type:pdf, Size:1020Kb

Scientific American, July, 1956 SCIENTIFIC ERIC ANTIOCHUS I, KING OF KOMMAGENE F/FTYCENTS �/956 © 1956 SCIENTIFIC AMERICAN, INC A pound of fuel to light Chicago THAT'S ALL THE URANIUM needed to produce atomic production processes, to test product quality, and for power equal to the energy in 3 million pounds of coal. research. It could light Chicago for a full day! THE CHALLENGING FIELD of atomic energy is not ATOMIC RESEARCH is focused on developing an eco­ new to the people of Union Carbide. They have been nomical way to produce electricity from atomic energy. pioneering in every phase of this exciting business­ Scientists at Oak Ridge National Laboratory, which from the mining of uranium ore to harnessing the atom Union Carbide Nuclear Company operates for the for ·our future comfort and well-being. Atomic Energy Commission, have already built experi­ F R E E: To learn more about the atom and the tremendous mental power producing reactors that are serving as a strides made in the peaceJul applications oj atomic energy, guide to commercial atom power plants. write Jor the illustrated booklet "The Atom In Our Hands." PEACEFUL USES for the atom have also been found in the diagnosis and treatment of disease. Radioactivity is UNION CARBIDE uncovering important facts about plant and animal AND CARBON CORPORATION growth. Industry uses the atom's radiation to control 30 EAST 42ND STREET 00 NEW YORK 17. N. Y. In Canada: UNION CARBIDE CANADA LIMITED, Toronto VCC's Trade-marked Products include ELECTROMET Alloys and Metals CRAG Agricultural Chemicals NATIONAL Carbons ACHESON Electrodes SYNTHETIC ORGANIC CHEMICALS HAYNES STELLITE Alloys PREST-O-LITE Acetylene PYROFAX Gas PRESTONE Anti-Freeze UNION CARBIDE Silicones UNION EVEREADY Carbide Flashlights and Batteries LINDE Oxygen BAKELITE, VINYLITE, and KRENE Plastics Dynel Textile Fibers © 1956 SCIENTIFIC AMERICAN, INC New materials ideas from United States Plywood Warp-free woad panel-Novoply-is a 3-ply laminate with faces of New tough-faced plywood-Ouraply-is exterior grade fir plywood specially prepared wood flakes and a core of wood chips-all resin­ with a smooth overlay face of phenolic resins and cellulose fibers. Twice as impregnated and molded under heat and pressure to form a dense, hard, wear-resistant as ordinary plywood; smooth surface takes paint better, flat panel. Novoply is extremely rigid, dimensionally stable. In thicknesses holds it longer; needs no primer coat. Used in boats, signs, outdoor furniture, from ¥au to lu; sizes up to 4' x 16'. Used as core stock for furniture, as building siding. In five thicknesses: 7I6u to 'l4 u; all plywood sizes. OURAPLY®. sliding doors, and wardrobes. NOVOPLY®_ Metal-clad plywood-Armorply-has permanently bonded faces of New double-duty vIsual old-Chalkboard-is writing surface and copper, aluminum, stainless steel or any other metal on one or both sides. magnetic display board in one. Made of plywood with porcelain-on-steel Plywood backing gives strength and rigidity. lightweight, verminproof, face, and backed with steel. Magnets cling to surface to hold displays or waterproof, easy ta work. Sizes to order. Used for cold storage rooms, demonstration material. Available in gray, green or blue; and in tlprojection sectional electrical shielded roams (shown above), truck bodies, carrying white" for use as movie screen. Sizes to order, (max. width: 4'; max. cases. ARMORPL Y®. length: 10'). CHALKBOARD@. United States Plywood has developed scores of specialized products for industry, in wood and laminated constructions. Let an experienced United States Plywood Field Engineer come in to help you solve materials problems. .------------------------------------------------, I United States Plywood Corporation I � I Division of Field Engineering I 55 West 44th St., New York 36, N. Y. SA 7-56 I I Gentlemen: Please send me information on: I o I United States Plywood o Novaply Duraply I o Armorply o Chalkboard I I o Please have Field Engineer call. I I NAME......... ................................................... I I Corporation TITLE .............................................................. I I COMPANy ....................................................... I 87 Branch Offices in Principal Cities I ADDRESS ......................................................... I I Home Office: Weldwood Building, New York City CiTy ...................................... STATE ................. .. I -------------------------------------------------� © 1956 SCIENTIFIC AMERICAN, INC You can't make Titanium ""ithout Titanium TET! And you can say much the same for Boron, Silicon and Zirconium .. , you must have the chlorides! Stauffer has METALLIC CHLORIDES in tremendous quantities ... has produced them for many years. You can have them in truck or carload quantities to meet your delivery schedules. Stauffer's unparalleled experience with fluidized bed techniques and other modern manufacturing processes is a major influence on ..• available quantity increasing purity decreasing cost * •..of these necessary METALLIC CHLORIDES. Send us your specifications. If we know them, we can meet them. *B ... Si .., Ti .., Zr Boron Silicon Titanium Zirconium Trichloride Tetrachloride Tetrachloride Tetrachloride STAUFFER CHEMICAL COMPANY 380 Madison Avenue, New York 17, N. Y. 2 © 1956 SCIENTIFIC AMERICAN, INC SCIENTIFIC Established 1845 .AMERIC.AN" July, 1956 Volume 195 Number 1 ARTICLES 25 A STUDY OF VALUES, by Evon Z. Vogt and John M. Roberts An inquiry into the role of values at a confluence of cultures in the Southwest. 32 THE RADIO SKY, by John D. Kl'aus Radio waves from outer space give us a remarkable new panorama of the heavens. 38 THE TOMB OF ANTlOCHUS I, by Theresa Goell and F. K. Doerner Ancient East and West meet at a grandiose mountaintop monument in Turkey. 55 THE ATOlVlIC NUCLEUS, by Robert Hofstadter Beams of high-speed electrons give us an indirect way of peering into the nucleus. 71 SP ACE PERCEPTION IN THE CHICK, by Eckhard H. Hess Bespectacled birds demonstrate differences between learned and innate behavior. 83 P ALEOBIOCHEMISTRY, by Philip H. Abelson Organic remains in fossils are a clue to the chemistry of animals long extinct. 97 PROGRESS IN SOLAR POWER, by Harry Tabor The search for ways to tap the sun's energy has taken some promising new turns. 109 SEXUALiTY IN BACTERIA, by Elie L. Wollman and Franllois Jacob When bacteria reproduce sexually (a rare event), they clarify the genetic process. DEPARTMENTS 6 LETTERS 12 50 AND 100 YEARS AGO 18 THE AUTHORS 46 SCIENCE AND THE CITIZEN 120 BOOKS 135 THE AMATEUR SCIENTIST 148 BIBLIOGRAPHY BOA ROO FED ITO R S Gerard Piel (Publisher), Dennis Flanagan (Editor), Leon Svirsky (Managing Editor), George A. W. Boehm, Jean Le Corbeiller, James R. Newman, E. P. Rosenbaum ART 0 IRE C TOR James Grun baum GENE R A L MANAGE R Donald H. Miller, Jr. A 0 V E R TIS I N G MANAGE R Martin M. Davidson COPYRIGHT 1956 IN THE U. S. AND BERNE CONVENTION COUNTRIES BY SCIENTIFIC AMERICAN, INC. ALL RIGHTS RESERVED, ENTERED AT THE NEW YORK,. N. '1'., POST OffiCE AS SECOND-CLASS MATTER JUNE 28, 1879, UNDER THE ACT OF MARCH 3, 1879. ADOITIONAl ENTRY AT GREENWICH, CONN. SUBSCRIPTION RATE IN THE U. S. $5 PER YEAR. 3 © 1956 SCIENTIFIC AMERICAN, INC Random Vibration Testing: CALI DVN E"S NEW COMPLETE, MATCHED SYSTEMS THE COVER Antiochus I, whose stone portrait appears on the cover, ruled over the tiny Near Eastern kingdom of Kom­ magene from about 69 to 34 B.C. During his lifetime he built a re­ markable monument to himself on the summit of Nemrud Dagh, a 7,500-foot mountain in what is now southeastern Turkey (see page 38). The monument consists of a huge mound of loose stones surrounded by three terraces decorated with re­ liefs, altars and colossal statues of Antiochus and his curious hybrid gods. In the photograph on the cover the slope of the mound may be seen at the upper left. The head of Amplifier Antiochus stands amid the rubble combinations in 1500, 5,000 and of fallen statuary on the West Ter­ 15,000 pound force ratings race of the monument. Made of limestone, it stands about eight feet When Calidyne first investigated the high. It was originally part of a problem of building random vibration test 24 systems, it recognized the necessity of over-all statue between and 30 feet high. system engineering, if desired performance levels were to be achieved. That goal has now been met in what is probably the firstcomplete, integrated system comprised of matched components. THE ILLUSTRATIONS "Wide-Band" electrodynamic Shakers oper­ ate at higher frequencies on lower input power, Cover photograph by Heinrich for a given armature weight and matched load Buerger, Nemrud Dagh Excavations rating. In random testing the load approximates the armature weight, and inherent armature Page Source rigidity maintains a high first resonance. The new Random Noise Amplifiers are matched power 25 Evon Z. Vogt sources for the "wide band" Shakers. Made by 26-31 David De Harport Westinghouse to Calidyne specifications, they 32 Eric Mose provide ample power for continuous duty oper- ation at full performance. At the same time they 33 Ohio State University are capable of supplying instantaneous power 34-35 Ohio State University peaks for random noise tests. (top) , Eric Mose (bot­ The Model 188 Console is a typical control tom) unit for any of several systems. It contains basic 36 Eric Mose Shaker-Amplifier operating controls, input shap­ ing and compensation circuits, plus monitoring and 37 Ohio State University other control equipment. With these components, 38-39 Friedrich Karl Doerner Field Power Supplies complete the over-all system. 40 John Langley Howard 41-44 Friedrich Karl Doerner 55 Stanford University 56-68 James Egleson 71-76 Eckhard H. Hess 83 Hoy Stevens 84 Carnegie Institution of Washington SALES REPRESENTATIVES: MINNEAPOLIS,MINN_ ALBUaUERQUE, NEW MEXICO WALTHAM MASS. NORTHERN NEW YORK WASHINGTON, D. C. ' G.B.Miller Co. 86-88 Roy Stevens Roberl A, Wolers, Inc. Technicol lnSlrumenh, Inc, F. R. Jodon, Inc. Hugh Manland & Co. Albuquerque Wolrham 5.6900 Waltham, Moss.
Recommended publications
  • Comparison of Theodorsen's Unsteady Aerodynamic Forces with Doublet Lattice Generalized Aerodynamic Forces 5B
    NASA/TM–2017-219667 Comparison of Theodorsen’s Unsteady Aerodynamic Forces with Doublet Lattice Generalized Aerodynamic Forces Boyd Perry, III Langley Research Center, Hampton, Virginia September 2017 NASA STI Program . in Profile Since its founding, NASA has been dedicated to the x CONFERENCE PUBLICATION. advancement of aeronautics and space science. The Collected papers from scientific and technical NASA scientific and technical information (STI) conferences, symposia, seminars, or other program plays a key part in helping NASA maintain meetings sponsored or co-sponsored by NASA. this important role. x SPECIAL PUBLICATION. Scientific, The NASA STI program operates under the auspices technical, or historical information from NASA of the Agency Chief Information Officer. It collects, programs, projects, and missions, often organizes, provides for archiving, and disseminates concerned with subjects having substantial NASA’s STI. The NASA STI program provides access public interest. to the NTRS Registered and its public interface, the NASA Technical Reports Server, thus providing one x TECHNICAL TRANSLATION. of the largest collections of aeronautical and space English-language translations of foreign science STI in the world. Results are published in both scientific and technical material pertinent to non-NASA channels and by NASA in the NASA STI NASA’s mission. Report Series, which includes the following report types: Specialized services also include organizing and publishing research results, distributing x TECHNICAL PUBLICATION. Reports of specialized research announcements and feeds, completed research or a major significant phase of providing information desk and personal search research that present the results of NASA support, and enabling data exchange services. Programs and include extensive data or theoretical analysis.
    [Show full text]
  • Smithsonian Miscellaneous Collections
    Ubr.C-ff. SMITHSONIAN MISCELLANEOUS COLLECTIONS VOLUME 143, NO. 3 SUPPLEMENT TO THE ANNOTATED, SUBJECT-HEADING BIBLIOGRAPHY OF TERMITES 1955 TO I960 By THOMAS E. SNYDER Honorary Research Associate Smithsonian Institution (Publication 4463) CITY OF WASHINGTON PUBLISHED BY THE SMITHSONIAN INSTITUTION DECEMBER 29, 1961 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOLUME 143, NO. 3 SUPPLEMENT TO THE ANNOTATED, SUBJECT-HEADING BIBLIOGRAPHY OF TERMITES 1955 TO 1960 By THOMAS E. SNYDER Honorary Research Associate Smithsonian Institution ><%<* Q (Publication 4463) CITY OF WASHINGTON PUBLISHED BY THE SMITHSONIAN INSTITUTION DECEMBER 29, 1961 PORT CITY PRESS, INC. BALTIMORE, NID., U. S. A. CONTENTS Pagre Introduction i Acknowledgments i List of subject headings 2 Subject headings 3 List of authors and titles 72 Index 115 m SUPPLEMENT TO THE ANNOTATED, SUBJECT-HEADING BIBLIOGRAPHY OF TERMITES 1955 TO 1960 By THOMAS E. SNYDER Honorary Research Associate Smithsonian Institution INTRODUCTION On September 25, 1956, an "Annotated, Subject-Heading Bibliography of Ter- mites 1350 B.C. to A.D. 1954," by Thomas E. Snyder, was published as volume 130 of the Smithsonian Miscellaneous Collections. A few 1955 papers were included. The present supplement covers publications from 1955 through i960; some 1961, as well as some earlier, overlooked papers, are included. A total of 1,150 references are listed under authors and tides, and 2,597 references are listed under subject headings, the greater number being due to cross references to publications covering more than one subject. New subject headings are Radiation and Toxicology. ACKNOWLEDGMENTS The publication of this bibliography was made possible by a grant from the National Science Foundation, Washington, D.C.
    [Show full text]
  • University of Southampton Research Repository
    University of Southampton Research Repository Copyright © and Moral Rights for this thesis and, where applicable, any accompanying data are retained by the author and/or other copyright owners. A copy can be downloaded for personal non-commercial research or study, without prior permission or charge. This thesis and the accompanying data cannot be reproduced or quoted extensively from without first obtaining permission in writing from the copyright holder/s. The content of the thesis and accompanying research data (where applicable) must not be changed in any way or sold commercially in any format or medium without the formal permission of the copyright holder/s. When referring to this thesis and any accompanying data, full bibliographic details must be given, e.g. Thesis: Author (Year of Submission) "Full thesis title", University of Southampton, name of the University Faculty or School or Department, PhD Thesis, pagination. Data: Author (Year) Title. URI [dataset] UNIVERSITY OF SOUTHAMPTON FACULTY OF NATURAL AND ENVIRONMENTAL SCIENCES School of Biological Sciences The Effects of Extremely Low Frequency Electromagnetic Fields on Insects by Sebastian James Shepherd Thesis for the degree of Doctor of Philosophy January, 2018 UNIVERSITY OF SOUTHAMPTON ABSTRACT FACULTY OF NATURAL AND ENVIRONMENTAL SCIENCES School of Biological Sciences Thesis for the degree of Doctor of Philosophy THE EFFECTS OF EXTREMELY LOW FREQUENCY ELECTROMAGNETIC FIELDS ON INSECTS Sebastian James Shepherd Flying insect species are currently in decline, including many species that provide important pollination ecosystem services. Combined exposure to various environmental stressors are associated with insect declines, including land-use change, pesticide use and climate change, but the potential biological and environmental effects of extremely low frequency electromagnetic fields (ELF EMFs) are poorly understood.
    [Show full text]
  • Northern Territory NT Page 1 of 204 21-Jan-11 Species List for NRM Region Northern Territory, Northern Territory
    Biodiversity Summary for NRM Regions Species List What is the summary for and where does it come from? This list has been produced by the Department of Sustainability, Environment, Water, Population and Communities (SEWPC) for the Natural Resource Management Spatial Information System. The list was produced using the AustralianAustralian Natural Natural Heritage Heritage Assessment Assessment Tool Tool (ANHAT), which analyses data from a range of plant and animal surveys and collections from across Australia to automatically generate a report for each NRM region. Data sources (Appendix 2) include national and state herbaria, museums, state governments, CSIRO, Birds Australia and a range of surveys conducted by or for DEWHA. For each family of plant and animal covered by ANHAT (Appendix 1), this document gives the number of species in the country and how many of them are found in the region. It also identifies species listed as Vulnerable, Critically Endangered, Endangered or Conservation Dependent under the EPBC Act. A biodiversity summary for this region is also available. For more information please see: www.environment.gov.au/heritage/anhat/index.html Limitations • ANHAT currently contains information on the distribution of over 30,000 Australian taxa. This includes all mammals, birds, reptiles, frogs and fish, 137 families of vascular plants (over 15,000 species) and a range of invertebrate groups. Groups notnot yet yet covered covered in inANHAT ANHAT are notnot included included in in the the list. list. • The data used come from authoritative sources, but they are not perfect. All species names have been confirmed as valid species names, but it is not possible to confirm all species locations.
    [Show full text]
  • FLUID DYNAMICS, Volume IV
    http://dx.doi.org/10.1090/psapm/004 PROCEEDINGS OF SYMPOSIA IN APPLIED MATHEMATICS VOLUME IV FLUID DYNAMICS McGRAW-HILL BOOK COMPANY, INC. NEW YORK TORONTO LONDON 1953 FOR THE AMERICAN MATHEMATICAL SOCIETY 80 WATERMAN STREET, PROVIDENCE, RHODE ISLAND PROCEEDINGS OF THE FOURTH SYMPOSIUM IN APPLIED MATHEMATICS OF THE AMERICAN MATHEMATICAL SOCIETY Held at the University of Maryland June 22-23, 1951 COSPONSORED BY THE U.S. NAVAL ORDNANCE LABORATORY M. H. Martin EDITOR EDITORIAL COMMITTEE R. V. Churchill Eric Reissner A. H. Taub Copyright, 1953, by the McGraw-Hill Book Company, Inc. Printed in the United States of America. All rights reserved. This book, or parts thereof, may not be reproduced in any form without permission of the publishers. Library of Congress Catalog Card Number: 52-10326 CONTENTS EDITOR'S PREFACE v Some Aspects of the Statistical Theory of Turbulence 1 BY S. CHANDRASEKHAR A Critical Discussion of Similarity Concepts in Isotropic Turbulence 19 BY C. C. LIN The Nonexistence of Transonic Potential Flow 29 BY ADOLF BUSEMANN On Waves of Finite Amplitude in Ducts (Abstract) 41 BY R. E. MEYER On the Problem of Separation of Supersonic Flow from Curved Profiles .... 47 BY T. Y. THOMAS On the Construction of High-speed Flows 55 BY G. F. CARRIER AND K. T. YEN An Example of Transonic Flow for the Tricomi Gas 61 BY M. H. MARTIN AND W. R. THICKSTUN On Gravity Waves 75 BY A. E. HEINS Hydrodynamics and Thermodynamics 87 BY S. R. DE GROOT Nonuniform Propagation of Plane Shock Waves 101 BY J. M. BURGERS Theory of Propellers 109 BY THEODORE THEODORSEN Numerical Methods in Conformal Mapping 117 BY G.
    [Show full text]
  • ;• National Advisory Committee for Aeronautics
    I , / ;• NATIONAL ADVISORY COMMITTEE FOR AERONAUTICS REPORT No. 777 THE THEORY OF PROPELLERS Ill-THE SLIPSTREAM CONTRACTION WITH NUMERICAL VALUES FOR TWO-BLADE AND FOUR-BLADE PROPELLERS By THEODORE THEODORSEN 1944 For sale by the Superintendent of Documents - U. S. Government Printing Office - Washington 20, D. C. - Price 20 cents -S.- AERONAUTIC SYMBOLS 1. FUNDAMENTAL AND DERIVED UNITS Metric English Symbol Unit Abbrevia- Abbrevia- uunit t tion Length 1 meter--------------------m foot (or mile) --------- -ft (or mi) Time -------- --t second ----------------- --s second (or hour) ------- --see (or hr) Force---------- F weight of 1 kilogram kg weight of 1 pound-------lb Power ------- - P horsepower (metric) ----- --------— horsepower-------------hp Speed v f kilometers per hour--------kph miles per hour ---------- mph imeters per second ------- -mps feet per second--------- fps 2. GENERAL SYMBOLS W Weight=mg V Kinematic viscosity g Standard acceleration of gravity=9.80665 rn/s 2 p Density (mass per unit volume) or 32.1740 ft/sec' Standard density of dry air, 0.12497 kg-m-'-s' at 15° 0 W M Mass= — and 760 mm; or 0.002378 lb-ft-4 sec' g Specific weight of "standard" air, 1.2255 kg/ml or I Moment of inertia=mk2. (Indicate axis of 0.07651 lb/cu ft radius of gyration k by proper subscript.) Coefficient of viscosity 3. AERODYNAMIC SYMBOLS S Area ill Angle of setting of wings (relative to thrust line) S. Area of wing it Angle of stabilizer setting (relative to thrust 6' Gap line) b Span (7 Resultant moment C Chord Resultant angular velocity V
    [Show full text]
  • Interviw with Homer J. Stewart
    HOMER J. STEWART (1915 - 2007) INTERVIEWED BY JOHN L. GREENBERG October-November 1982 INTERVIEWED BY SHIRLEY K. COHEN November 3, 1993 1979 ARCHIVES CALIFORNIA INSTITUTE OF TECHNOLOGY Pasadena, California Subject area Engineering, aeronautical engineering Abstract Two interviews with Homer J. Stewart, aeronautical engineer and Caltech Professor of Aeronautics, 1942-1980, and Caltech alumnus (PhD, 1940). The interview by John L. Greenburg is in four sessions in October and November of 1982. A supplemental interview was conducted by Shirley K. Cohen in November 1993. The first interview covers Stewart’s youth and education (B.Aero.E., University of Minnesota, 1936) and his early interest in aeronautic technology. Comes to Caltech for graduate study in aeronautics, 1936-1940 (PhD, 1940); courses with faculty members W. Smythe, R. C. Tolman, E. T. Bell, M. Ward, H. Bateman. Comments on critical roles of Theodore von Kármán and Clark Millikan in establishment of graduate program known as GALCIT [Guggenheim Aeronautical Laboratory at the California Institute of Technology]; creation of GALCIT wind tunnel for testing; advancement of aeronautical engineering education; and linking of GALCIT to burgeoning California aerospace industry. Von Kármán’s identification of new technologies; his bridging of industry and http://resolver.caltech.edu/CaltechOH:OH_Stewart_H academe; similar integrating approach applied to founding of Jet Propulsion Laboratory [JPL]. Discusses GALCIT’s role in the development of commercial aviation in the 1930s. Appointment to professorial rank (1942) and wartime teaching and research on meteorology; comments on Irving Krick at Caltech. Discusses beginnings of rocketry at Caltech and his own pioneering contributions; work of Frank Malina and H.
    [Show full text]
  • Theodorsen's and Garrick's Computational
    https://ntrs.nasa.gov/search.jsp?R=20200002621 2020-05-24T04:40:06+00:00Z THEODORSEN’S AND GARRICK’S COMPUTATIONAL AEROELASTICITY, REVISITED Boyd Perry, III Distinguished Research Associate Aeroelasticity Branch NASA Langley Research Center Hampton, Virginia, USA International Forum on Aeroelasticity and Structural Dynamics Savannah, Georgia June 10-13, 2019 “Results of Theodorsen and Garrick Revisited” by Thomas A. Zeiler Journal of Aircraft Vol. 37, No. 5, Sep-Oct 2000, pp. 918-920 Made known that – • Some plots in the foundational trilogy of NACA reports on aeroelastic flutter by Theodore Theodorsen and I. E. Garrick are in error • Some of these erroneous plots appear in classic texts on aeroelasticity Recommended that – • All of the plots in the foundational trilogy be recomputed and published 2 “Results of Theodorsen and Garrick Revisited” by Thomas A. Zeiler Journal of Aircraft Vol. 37, No. 5, Sep-Oct 2000, pp. 918-920 Made known that – • Some plots in the foundational trilogy of NACA reports on aeroelastic flutter by Theodore Theodorsen and I. E. Garrick are in error • Some of these erroneous plots appear in classic texts on aeroelasticity Recommended that – • All of the plots in the foundational trilogy be recomputed and published Cautioned that – • “One does not set about lightly to correct the masters.” 3 Works Containing Erroneous Plots 1. Theodorsen, T.: General Theory of Aerodynamic Instability and the Mechanism of Flutter. NACA Report No. 496, 1934. 2. Theodorsen, T. and Garrick, I. E.: Mechanism of Flutter, a Theoretical and Experimental Investigation of the Flutter Problem. NACA Report No. 685, 1940. 3. Theodorsen, T.
    [Show full text]
  • Theodorsen's and Garrick's Computational
    THEODORSEN’S AND GARRICK’S COMPUTATIONAL AEROELASTICITY, REVISITED Boyd Perry, III Distinguished Research Associate Aeroelasticity Branch NASA Langley Research Center Hampton, Virginia, USA International Forum on Aeroelasticity and Structural Dynamics Savannah, Georgia June 10-13, 2019 “Results of Theodorsen and Garrick Revisited” by Thomas A. Zeiler Journal of Aircraft Vol. 37, No. 5, Sep-Oct 2000, pp. 918-920 Made known that – • Some plots in the foundational trilogy of NACA reports on aeroelastic flutter by Theodore Theodorsen and I. E. Garrick are in error • Some of these erroneous plots appear in classic texts on aeroelasticity Recommended that – • All of the plots in the foundational trilogy be recomputed and published 2 “Results of Theodorsen and Garrick Revisited” by Thomas A. Zeiler Journal of Aircraft Vol. 37, No. 5, Sep-Oct 2000, pp. 918-920 Made known that – • Some plots in the foundational trilogy of NACA reports on aeroelastic flutter by Theodore Theodorsen and I. E. Garrick are in error • Some of these erroneous plots appear in classic texts on aeroelasticity Recommended that – • All of the plots in the foundational trilogy be recomputed and published Cautioned that – • “One does not set about lightly to correct the masters.” 3 Works Containing Erroneous Plots 1. Theodorsen, T.: General Theory of Aerodynamic Instability and the Mechanism of Flutter. NACA Report No. 496, 1934. 2. Theodorsen, T. and Garrick, I. E.: Mechanism of Flutter, a Theoretical and Experimental Investigation of the Flutter Problem. NACA Report No. 685, 1940. 3. Theodorsen, T. and Garrick, I. E.: Flutter Calculations in Three Degrees of Freedom. NACA Report No. 741, 1942.
    [Show full text]
  • Revisiting Stigmergy in Light of Multi-Functional, Biogenic, Termite Structures As Communication Channel ⇑ Sebastian Oberst A,B, , Joseph C.S
    Computational and Structural Biotechnology Journal 18 (2020) 2522–2534 journal homepage: www.elsevier.com/locate/csbj Revisiting stigmergy in light of multi-functional, biogenic, termite structures as communication channel ⇑ Sebastian Oberst a,b, , Joseph C.S. Lai b, Richard Martin a, Benjamin J. Halkon a, Mohammad Saadatfar c, Theodore A. Evans d a Centre for Audio, Acoustics and Vibration, Faculty of Engineering and IT, University of Technology Sydney, 15 Broadway, Ultimo, NSW 2007, Australia b School of Engineering and IT, University of New South Wales Canberra, Northcott Dr, Campbell ACT 2612, Australia c Department of Applied Mathematics, Australian National University, 58-60 Mills Road, Canberra, ACT 2601, Australia d School of Biological Sciences, The University of Western Australia, 35 Stirling Hwy, Crawley, WA 6009, Australia article info abstract Article history: Termite mounds are fascinating because of their intriguing composition of numerous geometric shapes Received 2 March 2020 and materials. However, little is known about these structures, or of their functionalities. Most research Received in revised form 4 August 2020 has been on the basic composition of mounds compared with surrounding soils. There has been some tar- Accepted 5 August 2020 geted research on the thermoregulation and ventilation of the mounds of a few species of fungi-growing Available online 19 August 2020 termites, which has generated considerable interest from human architecture. Otherwise, research on termite mounds has been scattered, with little work on their explicit properties. Keywords: This review is focused on how termites design and build functional structures as nest, nursery and food Termite structures storage; for thermoregulation and climatisation; as defence, shelter and refuge; as a foraging tool or Complexity Superorganism building material; and for colony communication, either as in indirect communication (stigmergy) or Vibrational communication as an information channel essential for direct communication through vibrations (biotremology).
    [Show full text]
  • Thermoregulation Strategies in Ants in Comparison to Other Social Insects
    F1000Research 2014, 2:280 Last updated: 16 MAY 2019 REVIEW Thermoregulation strategies in ants in comparison to other social insects, with a focus on red wood ants (Formica rufa group) [version 2; peer review: 2 approved, 1 approved with reservations] Previously titled: Thermoregulation strategies in ants in comparison to other social insects, with a focus on Formica rufa Štěpánka Kadochová1, Jan Frouz2 1Department of Ecology, Charles University, Prague, CZ12800, Czech Republic 2Institute for Environmental Studies, Charles University, Prague, CZ12800, Czech Republic First published: 19 Dec 2013, 2:280 ( Open Peer Review v2 https://doi.org/10.12688/f1000research.2-280.v1) Latest published: 21 Mar 2014, 2:280 ( https://doi.org/10.12688/f1000research.2-280.v2) Reviewer Status Abstract Invited Reviewers Temperature influences every aspect of ant biology, especially metabolic 1 2 3 rate, growth and development. Maintenance of high inner nest temperature increases the rate of sexual brood development and thereby increases the colony fitness. Insect societies can achieve better thermoregulation than version 2 report solitary insects due to the former’s ability to build large and elaborated published nests and display complex behaviour. In ants and termites the upper part of 21 Mar 2014 the nest, the mound, often works as a solar collector and can also have an efficient ventilation system. Two thermoregulatory strategies could be version 1 applied. Firstly the ants use an increased thermal gradient available in the published report report report mound for brood relocation. Nurse workers move the brood according to 19 Dec 2013 the thermal gradients to ensure the ideal conditions for development.
    [Show full text]
  • A Multidisciplinary Approach to Taxonomy and Phylogeny of Australian Isoptera
    Alma Mater Studiorum Università degli Studi di Bologna Dipartimento di Biologia Evoluzionistica Sperimentale Dottorato di Ricerca in Biodiversità ed Evoluzione XIX CICLO Settore Scientifico Disciplinare BIO-05 A Multidisciplinary Approach to Taxonomy and Phylogeny of Australian Isoptera Dr. Silvia Bergamaschi Coordinatore Prof. Giovanni Cristofolini Tutor Prof. Mario Marini Index I Chapter 1 – Introduction 1 1.1 – BIOLOGY 2 1.1.1 – Castes: 2 - Workers 2 - Soldiers 3 - Reproductives 4 1.1.2 – Feeding behaviour: 8 - Cellulose feeding 8 - Trophallaxis 10 - Cannibalism 11 1.1.3 – Comunication 12 1.1.4 – Sociality Evolution 13 1.1.5 – Isoptera-other animals relationships 17 1.2 – DISTRIBUTION 18 1.2.1 – General distribution 18 1.2.2 – Isoptera of the Northern Territory 19 1.3 – TAXONOMY AND SYSTEMATICS 22 1.3.1 – About the origin of the Isoptera 22 1.3.2 – Intra-order relationships: 23 - Morphological data 23 - Karyological data 25 - Molecular data 27 1.4 – AIM OF THE RESEARCH 31 Chapter 2 – Material and Methods 33 2.1 – Morphological analysis 34 2.1.1 – Protocols 35 2.2 – Karyological analysis 35 2.2.1 – Protocols 37 2.3 – Molecular analysis 39 2.3.1 – Protocols 41 Chapter 3 - Karyotype analysis and molecular phylogeny of Australian Isoptera taxa (Bergamaschi et al., submitted). Abstract 47 Introduction 48 Material and methods 51 Results 54 Discussion 58 Tables and figures 65 II Chapter 4 - Molecular Taxonomy and Phylogenetic Relationships among Australian Nasutitermes and Tumulitermes genera (Isoptera, Nasutitermitinae) inferred from mitochondrial COII and 16S sequences (Bergamaschi et al., submitted). Abstract 85 Introduction 86 Material and methods 89 Results 92 Discussion 95 Tables and figures 99 Chapter 5 – Morphological analysis of Nasutitermes and Tumulitermes samples from the Northern Territory, based on Scanning Electron Microscope (SEM) images (Bergamaschi et al., submitted).
    [Show full text]