IBM Confidential Field Engineering Education Student Self-Study Course
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Report of Contributions
MT25 Conference 2017 - Timetable, Abstracts, Orals and Posters Report of Contributions https://indico.cern.ch/e/MT25-2017 MT25 Conferenc … / Report of Contributions 3D Electromagnetic Analysis of Tu … Contribution ID: 5 Type: Poster Presentation of 1h45m 3D Electromagnetic Analysis of Tubular Permanent Magnet Linear Launcher Tuesday, 29 August 2017 13:15 (1h 45m) A short stroke and large thrust axial magnetized tubular permanent magnet linear launcher (TPMLL) with non-ferromagnetic rings is presented in this paper. Its 3D finite element (FE) models are estab- lished for sensitivity analyses on some parameters, such as air gap thickness, permanent magnet thickness, permanent magnet width, stator yoke thickness and four types of permanent magnet material, ferrite, NdFeB, AlNiCO5 and Sm2CO17 are conducted to achieve greatest thrust. Then its 2D finite element (FE) models are also established. The electromagnetic thrusts calculated by 2D and 3D finite element method (FEM) and got from prototype test are compared. Moreover, the prototype static and dynamic tests are conducted to verify the 2D and 3D electromagnetic analysis. The FE software FLUX provides the interface with the MATLAB/Simulink to establish combined simulation. To improve the accuracy of the simulation, the combined simulation between the model of the control system in Matlab/Simulink and the 3D FE model of the TPMLL in FLUX is built in this paper. The combined simulation between the control system and the 3D FE modelof the TPMLL is built. A prototype is manufactured according to the final designed dimensions. The photograph of the developed TPMLL prototype with thrust sensor and the magnetic powder brake as the load are shown. -
Galvanic Isolation System with Wireless Power Transfer for Multiple Gate Driver Supplies of a Medium-Voltage Inverter Paper
電気学会論文誌●(●●●●●●●部門誌) IEEJ Transactions on ●●●●●●●●●●●●●●● Vol.●● No.● pp.●-● DOI: ●.●●/ieejeiss.●●.● Paper Galvanic Isolation System with Wireless Power Transfer for Multiple Gate Driver Supplies of a Medium-voltage Inverter * * * Keisuke Kusaka , Student member, Koji Orikawa, Member , Jun-ichi Itoh, Member a) ** ** ** Isamu Hasegawa , Non-member, Kazunori Morita , Member, Takeshi Kondo , Non-member (Manuscript received Jan. 00, 20XX, revised May 00, 20XX) In this paper, a gate driver supply, which supplies power to multiple gate drivers, is demonstrated. Robust isolation is required in the gate drive supplies of a medium-voltage inverter in order to drive high-voltage switching devices such as insulated-gate bipolar transistors. The proposed isolation system achieves isolation with transmission coils mounted on printed circuit boards. Furthermore, the isolation system transmits power from one transmitting board to six receiving boards. In the conventional system, the number of receivers is limited to one. In contrast, multiple receivers are acceptable in the proposed system. These characteristics help reduce the of the isolation system for the gate driver supplies. This paper presents the fundamental characteristics of the isolation system. The equivalent circuit of the proposed system can be derived by applying the equivalent circuit of a wireless power transfer system with a repeater coil. In addtion, a design method for the resonance capacitors is mathematically introduced using the equivalent circuit. It is verified that an isolation system with multiple receivers can be designed using the same resonance conditions as an isolation system with a single receiver. Moreover, the isolation system is experimentally demonstrated. It is confirmed that the isolation system transmits power with a maximum efficiency of 46.9% at an output power of 16.6 W beyond an air gap of 50 mm with only printed circuit boards. -
IEEE/PES Transformers Committee
Transformers Committee Chair: Sue McNelly Vice Chair: Bruce Forsyth Secretary: Ed teNyenhuis Treasurer: Paul Boman Awards Chair/Past Chair: Stephen Antosz Standards Coordinator: Jim Graham IEEE/PES Transformers Committee Spring 2019 Meeting Minutes Anaheim, CA March 24 – 28, 2019 Unapproved (These minutes are on the agenda to be approved at the next meeting in Fall 2019) TABLE OF CONTENTS GENERAL ADMINISTRATIVE ITEMS 1.0 Agenda 2.0 Attendance OPENING SESSION – MONDAY MARCH 25, 2019 3.0 Approval of Agenda and Previous Minutes – Susan McNelly 4.0 Chair’s Remarks & Report – Susan McNelly 5.0 Vice Chair’s Report – Bruce Forsyth 6.0 Secretary’s Report – Ed teNyenhuis 7.0 Treasurer’s Report – Paul Boman 8.0 Awards Report – Stephen Antosz 9.0 Administrative SC Meeting Report – Susan McNelly 10.0 Standards Report – Jim Graham 11.0 Liaison Reports 11.1. CIGRE – Craig Swinderman 11.2. IEC TC14 – Phil Hopkinson 11.3. Standards Coordinating Committee, SCC No. 18 (NFPA/NEC) – David Brender 11.4. Standards Coordinating Committee, SCC No. 4 (Electrical Insulation) – Evanne Wang 11.5. ASTM D27 – Tom Prevost 12.0 Approval of Transformer Committee P&P Manual - Bruce Forsyth 13.0 Hot Topics for the Upcoming – Subcommittee Chairs 14.0 Opening Session Adjournment CLOSING SESSION – THURSDAY MARCH 28, 2019 15.0 Chair’s Remarks and Announcements – Susan McNelly 16.0 Meetings Planning SC Minutes & Report – Tammy Behrens 17.0 Reports from Technical Subcommittees (decisions made during the week) 18.0 Report from Standards Subcommittee (issues from the week) 19.0 -
The Gulf of Georgia Submarine Telephone Cable
.4 paper presented at the 285th Meeting of the American Institute of Electrical Engineers, Vancouver, B. C., September 10, 1913. Copyright 1913. By A.I.EE. THE GULF OF GEORGIA SUBMARINE TELEPHONE CABLE BY E. P. LA BELLE AND L. P. CRIM The recent laying of a continuously loaded submarine tele- phone cable, across the Gulf of Georgia, between Point Grey, near Vancouver, and Nanaimo, on Vancouver Island, in British Columbia, is of interest as it is the only cable of its type in use outside of Europe. The purpose of this cable was to provide such telephonic facilities to Vancouver Island that the speaking range could be extended from any point on the Island to Vancouver, and other principal towns on the mainland in the territory served by the British Columbia Telephone Company. The only means of telephonic communication between Van- couver and Victoria, prior to the laying of this cable, was through a submarine cable between Bellingham and Victoria, laid in 1904. This cable was non-loaded, of the four-core type, with gutta-percha insulation, and to the writer's best knowledge, is the only cable of this type in use in North America. This cable is in five pieces crossing the various channels between Belling- ham and Victoria. A total of 14.2 nautical miles (16.37 miles, 26.3 km.) of this cable is in use. The conductors are stranded and weigh 180 lb. per nautical mile (44. 3 kg. per km.). By means of a circuit which could be provided through this cable by way of Bellingham, a fairly satisfactory service was maintained between Vancouver and Victoria, the circuit equating to about 26 miles (41.8 km.) of standard cable. -
VK4YE Compact End-Fed 5 Band HF Antenna
VK4YE Compact End-Fed 5 Band HF Antenna INTRODUCTION End-fed antennas are increasingly popular again, at least partly because of compact ferrite toroid cores. Small cores facilitate easy-to-build low-power RF transformers and networks. The combination of lightweight matching systems, combined with the installation simplicity of NOT hanging a heavy coaxial feeder from a long span of thin antenna wire, has rekindled interest in end-fed half-wave antennas. The 25m long antenna described here will get you on air without an ATU on 80m, 40m, 20m, 15m & 10m. It has been purposely reduced in length compared to a full sized 80m dipole by the insertion of a 70uH loading coil. At 7MHz, the impedance of the loading coil is about 3kΩ, and this effectively disconnects the tail of the antenna at 40m and above. The reason for reducing the size of the antenna is to enable operation on smaller house allotments as well as being compact enough for portable work. The length of the antenna from the feed point to the loading coil is 20.2m and this sets the 40m resonance at 7.1MHz, which in turn dictates the responses of the harmonically related bands 14MHz, 21MHz and 28MHz. As the length of the antenna is around 2/3 of the span of a half-wave dipole on 80m, there are two compromises. Firstly, bandwidth on 80m is restricted to about 80 kHz at the 2:1 SWR points, and secondly, there will be a reduction of around 1.5 S points in both transmitted and received signals. -
APRIL 1939 Vol. 17, No. 4
APRIL 1939 Vol. 17, No. 4 www.americanradiohistory.com ELECTRICAL COMMUNICATION A Journal of Progress in the Telephone. Telegraph and Radio Art H. T. KOHLHAAS, EDITOR EDITORIAL BOARD E. A. Brofos G. Deakin E. M. Deloraine P. E. Erikson F. Gill W. Hatton R. A. Mack H. M. Pease Kenneth E. Stockton C. E. Strong Issued Quarterly by the /nf-l!rnuil'1nu/ Sruunurd Elec/-ric Corpora/ion 67 BROAD STREET, NEW YORK, N.Y., U.S.A. Volume XVII April, 1939 Number 4 PAGE PUBLIC ADDRESS SYSTEM AT THE THIRTY-FOURTH INTERNATIONAL EUCHARISTIC CONGRESS, BUDAPEST, MAY 22�29, 1938.......... 319 By G. A. de Czegledy ULTRA-SHORT WAVE OSCILLATORS ........... .............. ... 325 By D. H. Black ULTRA-SHORT WAVE POLICE RADIO TELEPHONE INSTALLATIONS IN OSLO AND STOCKHOLM. .. .. .. .. .. .. .. .. .. .. 335 By G. Weider R-6 AUTOMATIC SYSTEM...................................... 346 By F. Gohorel and R. Lafon }AMES LAWRENCE McQuARRIE .................................. 358 }AMES LAWRENCE McQuARRIE-AN APPRECIATION................ 359 By F. B. Jewett THE BUCHAREST-PLOESTI TOLL CABLE .........•................ 360 By A. C. Nano SOME INDUSTRIAL APPLICATIONS OF SELENIUM RECTIFIERS. .. .. .. 366 By S. V. C. Scruby and H. E. Giroz A LONG DISTANCE AUTOMATIC TELEPRINTER EXCHANGE WITH MANUAL PRIORITY SERVICES ........................................ 375 By G. A. M. Hyde THE EIFFEL TOWER TELEVISION TRANSMITTER. .. .. .. .. .. .. .. 382 By S. Mallein and G. Rabuteau RECENT TELECOMMUNICATION DEVELOPMENTS OF INTEREST. .. .. .. 398 www.americanradiohistory.com Jam es L. McQuarrie 1867-1939 www.americanradiohistory.com Public Address System at the Thirty-Fourth International Eucharistic Congress Budapest, May 22-29, 1938 By G. A. DE CZEGLEDY, A.M.I.R.E., Chief Engineer, Standard Electric Company Limited, Budapest, Hungary NTERNATIONAL Eucharistic Congresses fully for the benefit of multitudes, both at the I rank amongst the outstanding events in Congresses themselves and at distant points, the Catholic world of modern times. -
Eletoz/Vie Patented Sept
Sept. 7, 1926. 1,598,673 O. B. BLACKWELL ET AL SECRECY COMMUNICATION SYSTEM Filed Dec. 18, 1920 R (2AA%aeaeAA 8 eletoz/vie Patented Sept. 7, 1926. 1,598,673 UNITED STATES PATENT office. OTTO B. BLACKWELL, OF GARDEN CITY, NEW YORK; DE Loss K. MARTIN, or oRANGE, NEW JERSEY; AND GILBERT S. VERNAM, OF BROOKLYN, NEw YoRK, AssGNORs TO AMERICAN TELEPHONE AND TELEGRAPH. COMPANY, A CoRFoRATION of NEW YORK, sECREGY coMMUNICATIoN sYSTEM. Application filed December 18, 1920. Serial No. 431,721. This invention relates to a signaling sys pear more fully from the detailed descrip 50 tem wherein signals are transmitted by the tion hereinafter given. agency of a high frequency wave modu The arrangements of the invention are ill lated in accordance with said signals, and lustrated in the accompanying drawing, in more particularly to a signalling system em the figure of which is shown a sendingsta ploying a plurality of high frequency tion of a system embodying the invention. 35 waves. It is the object of the invention to In the arrangements of the drawing are rovide a system of communication where shown four low frequency channels 1, 2, 3 y secret communications between stations and 4 from which the low frequency sig 10 may be had to the end that stations, other nals, such as four telephone messages, may than those designed to receive, may not re be transmitted through modulating appara 60 ceive complete, intelligible signals. tus out over a transmission line L. The Heretofore in certain types of signaling modulating apparatus is shown schemati systems, in which a high frequency wave is cally and includes the modulators M., M., 15 utilized as the agency for transmitting the Me and Ma, with which are associated the signals, he signals have been transmitted high frequency sources A, B, C, and D, 65 by electromagnetic waves of a definite high which are of suitable different frequencies. -
Privateline Magazine-November-December-1995.Pdf
Volume 2, No. 6 Nov ember/December $4.50 rivate line a journal of inquiry into the telephone system Alexander Graham Bell CABLE STATION ... OPERATIONS J • > , t f CANADIAN i TELECOM, - PART2 DIGITAL TELEPHONY BILL UPDATE MICROWAVE PROPAGATION BASICS DEF CON Ill REVIEW INDEX TO PR/VA TE LINE, VOLUME2 As reported oo CBS "60 Mlnu111•: How cortaln de vices can slowd own - 1v1nslop - watthour mel11I- Damien Thorn's ceLLULAR+co MPUTERS+TELco+sEcuRrrv :!'~:~d:,,~r~~Jro~: :ii~~~/!l!~~~~~:~ scrlbesm eler creep, overload droop, elc. Plans $29. 1,0, MANUAL,Exte rnal maoneUcwa ys (applled lo the melerlts eH)l o slow down and slopwaltllo ur melers 1 ULTIMATE HACKER 2011 Cruc en t Dr ., P.O . Drawer 537 ;l'~Ed~s ~'io~ ~~~~~r ~e~~~s :~~ ~ Alamogordo , NM 8831 o error modes( many), ANSI Standards, etc.Dem and and ~ (5051 439-1776 439 -8551 · Polyphan Melen. E,perlmcntalresulls l o slow and 8A M _ 7PM MST, Mon_ sai stop metersby others. $19. Any 2, $38. All 3, $59. Ell.!G (5051 434-0234, 434 -1778 (orde,s FILE ARCHIVE ON CD-ROM only;W you g el voice,enler• 111 111· anyUme): 24-hr ATMcrlm11 , abuses,,u ln111blllUn and dalHls 11- Fcea Te c h Byooo n; (relates dlrecUy1 0 your posedl1 00+ methodsd eta!ed, Include:Physka l, Reg. orderor prospectiveOfde~: Tu••· and Thurs. only. E. cipher, PINcompromise. card counterteltino, mao lili.lllunJJ tdlltlJl~ ZJ!ll±.AddS5 neticslrlpe, fa lse froo~ TEMrEST, Van Ed<.tapping , 10131s;lffOS: Canada) . Al aemsIn slock. VI SA.M C11dOK. spoollng,Inside lob , •~r-<ool, vfbrallon,pulse, high The entire underground NoCODs °' 'bill me•s.Ne w Catalog (200+ olfersl $2 voltage- olhers.C ase his1<>f1es,law, comlermeasures, order $5'N1! (check or MO).li!l..d.Qlru. -
Chapter 4 Inductive Loading
Chapter 4 Inductive Loading 4.0 Introduction This chapter explores the use of inductive loading to increase Rr and to enable excitation of a grounded tower. Chapter 3 demonstrated the utility of capacitive top- loading where the increase in Rr was primarily due to beneficial changes in the current distribution on the vertical. However, top-loading is not the only means for increasing Rr. We can move the tuning inductor or even only a portion of it, from the base up into the vertical. We can also move the feedpoint higher in the vertical. This chapter includes a discussion of multiple-tuning, a technique using inductors to manipulate the feedpoint impedance and distribution of current between multiple parallel wires. 4.1 Loading inductor location Figure 4.1 - Current distribution on a 50' vertical at 475 kHz. 1 In HF mobile verticals it has long been standard practice to move the loading inductor from the base up into the vertical to increase Rr[1]. We can do the same for LF/MF verticals. Figure 4.1 compares the current distribution on a 50' vertical with the tuning inductor at the base and just above midpoint. With the inductor near the midpoint the current below it remains essentially equal to Io. Increasing the current along the lower part of the vertical increases the Ampere-degree area A' (see section 3.3) which translates to increased Rr: 0.22Ω → 0.57Ω. Figure 4.2 - Efficiency as a function of loading inductor location and value. To keep the antenna resonant as we move the coil its value (XL) must be increased, 3411Ω → 6487Ω. -
IP 202-1 List of Materials
Changes to the List of Materials August 3, 2021 1. Page be(2.3) a. Added Siemens i. CMR May 6, 2021 1. Page Ugn-2 a. Added Aluma-Form i. ENC Series April 27, 2021 1. Page Ugk-2.2 a. Added Prysmian i. PCT Series (15, 25, 35kV) February 9, 2021 1. Page be(4.3) a. Added Southern States single-phase SSR type recloser. February 4, 2021 1. Pages rp(1), rp(1.2) a. Revised “Cantega” to “Hubbell Power Systems”. b. Added trademark to Reliaguard. December 10, 2020 1. Page ap-2 a. Modified page number from “1.1” to “2”. November 18, 2020 1. Pages an-3 and an(3.1) a. Moved Virginia Transformer from page an(3.1) Conditional to page an-3 Full Acceptance. November 6, 2020 1. Page ae-1 a. Added Celeco i. Catalog Numbers: HSCEL, RPCEL October 26, 2020 1. Page Uhb-1.1 a. Added TE Connectivity i. Catalog Numbers: 25 kV, used with loadbreak connectors (without test point) - ELB-25- 200 series without jacket seal, ELB-25-200-ES series with jacket seal October 23, 2020 1. Page p(1) a. Added TE Connectivity (Raychem) i. Catalog number: TIL Series September 30, 2020 1. Pages a(3), ea(4), ea(5) – Added new Hendrix insulator models. a. Catalog Numbers: HPI-15VTC, HPI-15VTP, HPI-25VTC-02, HPI-35VTC-02, HPI-35VTP-02, HPI-LP-14FS/FA, HPI-LP-16F, HPI-CLP-15, HPI-CLP-17, HPI-CLP-20 July 7, 2020 1. Page cm-2 – Added Aluma-Form, Inc. -
Highlights of Antenna History
~~ IEEE COMMUNICATIONS MAGAZINE HlOHLlOHTS OF ANTENNA HISTORY JACK RAMSAY A look at the major events in the development of antennas. wires. Antenna systems similar to Edison’s were used by A. E. Dolbear in 1882 when he successfully and somewhat mysteriously succeeded in transmitting code and even speech to significant ranges, allegedly by groundconduction. NINETEENTH CENTURY WIRE ANTENNAS However, in one experiment he actually flew the first kite T is not surprising that wire antennas were inaugurated antenna.About the same time, the Irish professor, in 1842 by theinventor of wire telegraphy,Joseph C. F. Fitzgerald, calculated that a loop would radiate and that Henry, Professor’ of Natural Philosophy at Princeton, a capacitance connected to a resistor would radiate at VHF NJ. By “throwing a spark” to a circuit of wire in an (undoubtedly due to radiation from the wire connecting leads). Iupper room,Henry found that thecurrent received in a In Hertz launched,processed, and received radio 1887 H. parallel circuit in a cellar 30 ft below codd.magnetize needies. waves systematically. He used a balanced or dipole antenna With a vertical wire from his study to the roof of his house, he attachedto ’ an induction coilas a transmitter, and a detected lightning flashes 7-8 mi distant. Henry also sparked one-turn loop (rectangular) containing a sparkgap as a to a telegraph wire running from his laboratory to his house, receiver. He obtained “sympathetic resonance” by tuning the and magnetized needles in a coil attached to a parailel wire dipole with sliding spheres, and the loop by adding series 220 ft away. -
Characterization of Twisted Pair Telephone Cable for Broadband Telecommunication Services
XXIII Simpozijum o novim tehnologijama u poštanskom i telekomunikacionom saobraćaju – PosTel 2005, Beograd, 13. i 14. decembar 2005. CHARACTERIZATION OF TWISTED PAIR TELEPHONE CABLE FOR BROADBAND TELECOMMUNICATION SERVICES Bratislav Milovanović1, Aleksandar Marinčić2, Nebojša Dončov1 1Faculty of Electronic Engineering, Niš 2SANU member, Faculty of Electrical Engineering, Beograd Abstract: Characterization of the existing telephone subscriber loops infrastructure used by the modern broadband telecommmunication services such as xDSL has been presented in the paper. As loop transmission medium quality is one of key requirements for performance capabilities of these services, a method for modelling and simulation of subscriber loops infrastructure in the frequency domain is described. This method is based on ABCD transmission parameters matrix and the appropriate twisted pair cable model representation to account for frequency dependence of its primary per-unit length parameters. It is used to obtain some important subscriber loop characteristics over the service operating frequency band and to analyse quality of cable transmission from the aspect of Heaviside criterion fulfillment. Keywords: Twisted pair, xDSL service, transfer characteristics, insertion loss. 1. Introduction In recent years, internet and its multimedia contents, video service, consumer services and many others become the main source of high-speed data communication demands. Such high data-rate demands exceed the bandwidth of now mature high speed voice band modems (up to 56 kbps). The first higher-speed alternative with access speed at 128 kbps, the Integrated Services Digital Network (ISDN), did not achieve wide popularity due to its high installation cost, some incompatibility with the existing telephone service (POTS - Plain Old Telephone Service), and lack of standardization throughout the industry.