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Thermionic Emission and a Novel Electron Collector in a Liquid
1 Thermionic Emission and a Novel Electron Collector in a Liquid Helium Environment J. Fang1, Anatoly E. Dementyev1, Jacques Tempere1,2, and Isaac F. Silvera1 1Lyman Laboratory of Physics, Harvard University, Cambridge MA 02138, USA. 2TFVS, Universiteit Antwerpen, Groenenborgerlaan 171, 2020 Antwerpen, Belgium We study two techniques to create electrons in a liquid helium environment. One is thermionic emission of tungsten filaments in a low temperature cell in the vapor phase with a superfluid helium film covering all surfaces; the other is operating a glowing filament immersed in bulk liquid helium. We present both the steady state and rapid sweep I-V curves and the electron current yield. These curves, having a negative dynamic resistance region, differ remarkably from those of a vacuum tube filament. A novel low temperature vapor-phase electron collector for which the insulating helium film on the collector surface can be removed is used to measure emission current. We also discuss our achievement of producing multi-electron bubbles (MEBs) in liquid helium by a new method. 2 I. INTRODUCTION The study of free electrons on or in liquid helium started over four decades ago and continues to be an important area of research; many of the fundamental studies are discussed in refs. [1, 2]. There is continued interest [3, 4] in the fascinating properties of electrons on or under the surface. Electrons on the surface of liquid helium form a 2D electron gas and at high enough density can solidify into a lattice, demonstrating Wigner crystallization [5]. There is a 1 eV barrier for electrons to penetrate the surface of liquid helium [6, 7]. -
September 21-24 Murieta Equestrian Center • Rancho Murieta, CA
CDS Celebrates 50 Years Great American Insurance Group / USDF Region 7 Championships Featuring over $20,000 in Prize Money from USDF 50th Annual California Dressage Society Championship Show Featuring over $30,000 in Prize Money and Awards from CDS Great American Insurance Group / Breeders Championships West Coast Final 2017 September 21-24 Murieta Equestrian Center • Rancho Murieta, CA California Dressage Society enjoy your time in the saddle we have you covered! EQUINE MORTALITY TRAINER LIABILITY CARE, CUSTODY AND CONTROL FARM & RANCH COMMERCIAL PACKAGES EQUINE SURGICAL & MAJOR MEDICAL INSURANCE WORKERS’ COMPENSATION & EMPLOYERS LIABILITY FOLLOW US! CDI 0545437 . A division of Parker General Insurance GLENDORA, CA (800) 321-5723 www.Equine-ins.com Donna & Joe Parker Great American Insurance Group/USDF Region 7 Dressage Championships Licensed by United States Equestrian Federation CDS 50th ANNIVERSARY ANNUAL CHAMPIONSHIP SHOW SEPTEMBER 21-24, 2017 MURIETA Equestrian Center, RANCHO MURIETA, CA • JUDGES • Sandra Hotz (4*) ........................................................................................Colorado Mike Osinski (4*) .................................................................................. Washington Brenda Minor (4*) ........................................................................................Canada Sue Mandas (S) Breed Judge ..........................................................................Ohio Louise Koch (S) ........................................................................................California -
Register of Lords' Interests
REGISTER OF LORDS’ INTERESTS _________________ The following Members of the House of Lords have registered relevant interests under the code of conduct: ABERDARE, LORD Category 10: Non-financial interests (a) Director, F.C.M. Limited (recording rights) Category 10: Non-financial interests (c) Trustee, National Library of Wales (interest ceased 31 March 2021) Category 10: Non-financial interests (e) Trustee, Stephen Dodgson Trust (promotes continued awareness/performance of works of composer Stephen Dodgson) Chairman and Trustee, Berlioz Sesquicentenary Committee (music) Director, UK Focused Ultrasound Foundation (charitable company limited by guarantee) Chairman and Trustee, Berlioz Society Trustee, West Wycombe Charitable Trust ADAMS OF CRAIGIELEA, BARONESS Nil No registrable interests ADDINGTON, LORD Category 1: Directorships Chairman, Microlink PC (UK) Ltd (computing and software) Category 10: Non-financial interests (a) Director and Trustee, The Atlas Foundation (registered charity; seeks to improve lives of disadvantaged people across the world) Category 10: Non-financial interests (d) President (formerly Vice President), British Dyslexia Association Category 10: Non-financial interests (e) Vice President, UK Sports Association Vice President, Lakenham Hewitt Rugby Club (interest ceased 30 November 2020) ADEBOWALE, LORD Category 1: Directorships Director, Leadership in Mind Ltd (business activities; certain income from services provided personally by the member is or will be paid to this company; see category 4(a)) Director, Visionable -
Register of Lords' Interests
REGISTER OF LORDS’ INTERESTS _________________ The following Members of the House of Lords have registered relevant interests under the code of conduct: ABERDARE, LORD Category 10: Non-financial interests (a) Director, F.C.M. Limited (recording rights) Category 10: Non-financial interests (c) Trustee, Berlioz Society Trustee, St John Cymru-Wales Trustee, National Library of Wales Category 10: Non-financial interests (e) Trustee, West Wycombe Charitable Trust Trustee, Stephen Dodgson Trust (promotes continued awareness/performance of works of composer Stephen Dodgson) Chairman and Trustee, Berlioz Sesquicentenary Committee (music) ADAMS OF CRAIGIELEA, BARONESS Nil No registrable interests ADDINGTON, LORD Category 1: Directorships Chairman, Microlink PC (UK) Ltd (computing and software) Member of and Adviser to the Board of X-Forces (XF) Ltd (supporting ex-forces and their families to start up businesses) Category 10: Non-financial interests (d) President (formerly Vice President), British Dyslexia Association Category 10: Non-financial interests (e) Vice President, UK Sports Association Vice President, Lakenham Hewitt Rugby Club Trustee, Atlas Foundation (registered charity; seeks to improve lives of disadvantaged people across the world) ADEBOWALE, LORD Category 1: Directorships Director, Leadership in Mind Ltd (business activities; certain income from services provided personally by the Member is or will be paid to this company or to TomahawkPro Ltd; see category 4(a)) Non-executive Director, Three Sixty Action Ltd (holding company; -
Magnetic Induction
Online Continuing Education for Professional Engineers Since 2009 Basic Electric Theory PDH Credits: 6 PDH Course No.: BET101 Publication Source: US Dept. of Energy “Fundamentals Handbook: Electrical Science – Vol. 1 of 4, Module 1, Basic Electrical Theory” Pub. # DOE-HDBK-1011/1-92 Release Date: June 1992 DISCLAIMER: All course materials available on this website are not to be construed as a representation or warranty on the part of Online-PDH, or other persons and/or organizations named herein. All course literature is for reference purposes only, and should not be used as a substitute for competent, professional engineering council. Use or application of any information herein, should be done so at the discretion of a licensed professional engineer in that given field of expertise. Any person(s) making use of this information, herein, does so at their own risk and assumes any and all liabilities arising therefrom. Copyright © 2009 Online-PDH - All Rights Reserved 1265 San Juan Dr. - Merritt Island, FL 32952 Phone: 321-501-5601 DOE-HDBK-1011/1-92 JUNE 1992 DOE FUNDAMENTALS HANDBOOK ELECTRICAL SCIENCE Volume 1 of 4 U.S. Department of Energy FSC-6910 Washington, D.C. 20585 Distribution Statement A. Approved for public release; distribution is unlimited. Department of Energy Fundamentals Handbook ELECTRICAL SCIENCE Module 1 Basic Electrical Theory Basic Electrical Theory TABLE OF CONTENTS TABLE OF CONTENTS LIST OF FIGURES .................................................. iv LIST OF TABLES .................................................. -
Teaching Guide: Turning Points in Physics
Teaching guide: Turning points in physics This teaching guide aims to provide background material for teachers preparing students for the Turning Points in physics option of our A-level Physics specification (7408). It gives teachers more detail on specification topics they may not be familiar with and should be used alongside the specification. This guide is not designed to be used as a comprehensive set of teaching notes. Contents Page Introduction 2 Section 1 The discovery of the electron (specification reference 3.12.1) 3 a) Cathode rays 3 b) The specific charge of the electron 5 c) Millikan’s determination of the charge of the electron 9 Section 2 Wave particle duality (specification reference 3.12.2) 10 a) Theories of light 10 b) Matter waves 17 c) Electron microscopes 18 i) the transmission electron microscope 18 ii) the scanning tunneling microscope 20 Section 3 Special relativity (specification reference 3.12.3) 22 a) Frames of reference 23 b) The Michelson-Morley experiment 23 c) Time dilation and proper time 25 d) Length contraction and proper length 27 e) Evidence for time dilation and length contraction 28 f) Mass and energy 30 Appendix 34 A Suggested experiments and demonstrations 34 1 Introduction Turning Points in physics is intended to enable key developments in physics to be studied in depth so that students can appreciate, from a historical viewpoint, the significance of major conceptual shifts in the subject, both in terms of the understanding of the subject and in terms of its experimental basis. Each of the three sections within the course represents a different approach to the subject. -
History of Thethermionic Tube / Valve / Vacuum
History of theThermionic Tube / Valve / Vacuum Tube – Page 1 The following notes have been assembled by Phil (VK5SRP) from original material and material from several web sites, including Wikipedia for a class run at the North East Radio Club, South Australia January 2016. In electronics, a vacuum tube, an electron tube, or just a tube (North America), or valve (Britain and some other regions) is a device that controls electric current between electrodes in an evacuated container. Vacuum tubes mostly rely on thermionic emission of electrons from a hot filament or a cathode heated by the filament/heater. This type is called a thermionic tube or thermionic valve. A Photo-tube, however, achieves electron emission through the photoelectric effect. Not all electronic circuit valves/electron tubes are vacuum tubes (evacuated). Gas-filled tubes are similar devices containing a gas, typically at low pressure, which exploit phenomena related to electric discharge in gases, usually without a heater. Although thermionic emission was originally reported in 1873 by Frederick Guthrie, it was Thomas Edison's 1883 investigation that spurred future research, the phenomenon thus becoming known as the "Edison effect". Edison patented what he found, but he did not understand the underlying physics, nor did he have an inkling of the potential value of the discovery. It wasn't until the early 20th century that the rectifying property of such a device was utilised, most notably by John Ambrose Fleming, who used the Diode tube to detect (demodulate) radio signals. Lee De Forest's 1906 "Audion" was also developed as a radio detector, and soon led to the development of the Triode tube. -
16 Ömer Hayyam
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Chapter 5: X-Ray Production
Chapter 5: X-Ray Production Slide set of 121 slides based on the chapter authored by R. Nowotny of the IAEA publication (ISBN 978-92-0-131010-1): Diagnostic Radiology Physics: A Handbook for Teachers and Students Objective: To familiarize the student with the principles of X ray production and the characterization of the radiation output of X ray tubes. Slide set prepared by K.P. Maher following initial work by S. Edyvean IAEA International Atomic Energy Agency CHAPTER 5 TABLE OF CONTENTS 5.1 Introduction 5.2 Fundamentals of X Ray Production 5.3 X Ray Tubes 5.4 Energizing & Controlling the X Ray Tube 5.5 X Ray Tube & Generator Ratings 5.6 Collimation & Filtration 5.7 Factors Influencing X Ray Spectra & Output 5.8 Filtration Bibliography IAEA Diagnostic Radiology Physics: a Handbook for Teachers and Students – chapter 5, 2 CHAPTER 5 TABLE OF CONTENTS 5.1 Introduction 5.2 Fundamentals of X Ray Production 5.2.1 Bremsstrahlung 5.2.2 Characteristic Radiation 5.2.3 X Ray Spectrum 5.3 X Ray Tubes 5.3.1 Components of the X Ray Tube 5.3.2 Cathode 5.3.3 Anode 5.3.3.1 Choice of material 5.3.3.2 Line-Focus principle (Anode angle) 5.3.3.3 Stationary and rotating anodes 5.3.3.4 Thermal properties 5.3.3.5 Tube envelope IAEA 5.3.3.6 Tube housing Diagnostic Radiology Physics: a Handbook for Teachers and Students – chapter 5, 3 CHAPTER 5 TABLE OF CONTENTS 5.4 Energizing & Controlling the X-Ray Tube 5.4.1 Filament Circuit 5.4.2 Generating the Tube Voltage 5.4.2.1 Single-phase generators 5.4.2.2 Three-phase generators 5.4.2.3 High-frequency generators 5.4.2.4 -
Arthur H. Aufses, Jr., MD Archives Finding
Arthur H. Aufses, Jr., MD Archives Finding Aid - Robert Abbe papers and reprints (AA007) Generated by Arthur H. Aufses, Jr., MD Archives on June 11, 2021 Language of description: English Arthur H. Aufses, Jr., MD Archives Box 1102 - One Gustave L. Levy Pl. New York New York United States 10032 Telephone: 212-241-7239 Fax: 212-241-7864 Email: [email protected] https://icahn.mssm.edu/about/ait/archives https://archives.mssm.edu/index.php/aa007 Robert Abbe papers and reprints Table of contents Summary information ...................................................................................................................................... 3 Administrative history / Biographical sketch .................................................................................................. 3 Scope and content ........................................................................................................................................... 4 Notes ................................................................................................................................................................ 5 Access points ................................................................................................................................................... 5 Physical condition ........................................................................................................................................... 5 Series descriptions .......................................................................................................................................... -
Robert Abbe: Pioneer in Plastic Surgery* Richard B
92 7 ROBERT ABBE: PIONEER IN PLASTIC SURGERY* RICHARD B. STARK G[LIC~VHEN Robert Abbe died March 7, I928, it was written of him: "During his years of service, Dr. Abbe performed thousands of operations, many of them of the most serious and difficult nature and deservedly won the , reputation for himself of one of the world's most able surgeons."' This inventive and industrious, this gentle, human and whim- sical man who loved humanity and the arts alike achieved his position as one of the great surgeons of his time because of a philosophy of genius which he himself voiced so clearly; "[It] remains for [us] to help clear up the unfinished problems [in surgery]. The honor will surely come to someone, and why should not you or I be the one to grasp the apparently incomprehensive idea and put it in comprehensible language? "2 Living in the last half of the igth and the first quarter of the 20th centuries, Robert Abbe entered medicine at a time when the major foundations of surgery had been established: anesthesia, knowledge of the role of microorganisms in infection, and aseptic surgical tech- nique. Abbe's inquisitive and inventive nature contributed most to his development. Beyond, however, was a boundless energy and a persist- ence which achieved that which it began. And there were softer qualities,-humanity, a sense of history, and a love of the arts,-which made him a distinguished man bf his day. He was beloved for a buoy- ancy of spirit and a sense of humor which was leavened by lightness. -
Alpha Omega Alpha Honor Medical Society Autumn 2017
Alpha Omega Alpha Honor Medical Society Autumn 2017 Illustration by Jim M’Guinness THE PHAROS of Alpha Omega Alpha honor medical society Autumn 2017 Alpha Omega Alpha Honor Medical Society “Be Worthy to Serve the Suffering” Founded by William W. Root in 1902 Editor Richard L. Byyny, MD Officers and Directors at Large Eve Higginbotham, SM, MD President Managing Editor Dee Martinez Philadelphia, Pennsylvania Alan G. Robinson, MD Art Director and Illustrator Jim M’Guinness President Elect Los Angeles, California Designer Erica Aitken Joseph W. Stubbs, MD, MACP Immediate Past President Albany, Georgia Wiley Souba, Jr., MD, DSc, MBA Editorial Board Secretary-Treasurer Hanover, New Hampshire Robert G. Atnip, MD, FACS, RPVI Jeremiah A. Barondess, MD James G. Gamble, MD, PhD C. Ronald Mackenzie, MD Hershey, Pennsylvania New York, New York Stanford, California New York, New York Holly J. Humphrey, MD David A. Bennahum, MD Michael Gerber, MD Philip A. Mackowiak, MD Chicago, Illinois Albuquerque, New Mexico Denver, Colorado Baltimore, Maryland Richard B. Gunderman, MD, PhD John A. Benson, Jr., MD Dean G. Gianakos, MD Ashley Mann, MD Portland, Oregon Lynchburg, Virginia Kansas City, Kansas Indianapolis, Indiana Richard Bronson, MD Jean D. Gray, MD J. Joseph Marr, MD Sheryl Pfeil, MD Stony Brook, New York Halifax, Nova Scotia Broomfield, Colorado Columbus, Ohio John C.M. Brust, MD Richard B. Gunderman, MD, PhD Aaron McGuffin, MD John Tooker, MD, MBA New York, New York Indianapolis, Indiana Huntington, West Virginia Philadelphia, Pennsylvania Charles S. Bryan, MD Lara Hazelton, MD Stephen J. McPhee, MD Steven A. Wartman, MD, PhD Columbia, South Carolina Halifax, Nova Scotia San Francisco, California Washington, DC Robert A.