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Dynamics and Stability of Resonant Rings in Galaxies B
Astronomy Reports, Vol. 44, No. 5, 2000, pp. 279–285. Translated from Astronomicheskiœ Zhurnal, Vol. 77, No. 5, 2000, pp. 323–330. Original Russian Text Copyright © 2000 by Kondrat’ev. Dynamics and Stability of Resonant Rings in Galaxies B. P. Kondrat’ev Udmurt State University, Krasnoarmeœskaya ul. 71, Izhevsk, 426034 Russia Received December 24, 1998 Abstract—We have developed a model for a spheroidal, ring-shaped galaxy. The stars move in a ring with an elliptical cross section at the 1 : 1 frequency resonance. The shape of the cross section of the equilibrium ring depends on the oblateness of the galaxy itself, so that the ellipse of the ring cross section is radially extended when the oblateness of the galaxy is small. If the oblateness of galaxy exceeds some critical value, the ellipse cross section is extended along the Ox3 axis. The shape of the ring cross section is circular for a galaxy with critical eccentricity. The stability of the ring over a wide range of perturbations is studied. A fundamental bicu- bic dispersion equation for the frequencies of small oscillations of a perturbed ring is derived. Application of the model to the ring galaxy NGC 7020 shows that its ring cross section should be approximately circular. Anal- ysis of the dispersion equation demonstrates that stellar orbits in the arm are unstable (but the instability incre- ment is small). We conclude that stars in the ring of this galaxy should drift from the 1 : 1 resonance, and the ring itself should evolve. © 2000 MAIK “Nauka/Interperiodica”. 1. INTRODUCTION appearance of various commensurability ratios. -
February-March 2017
FROM THE QUARTERDECK FEBRUARY / MARCH 2017 THE COURSE IS SET... The process of modernizing our Jackson Creek waterfront is underway. Two committees have been formed: one We’ve been busy. Yes, really busy. to make financing recommendations for the East Dock While the winter months for most are replacement, and a second to supervise the eventual a break in sailing activities, Board construction. Steve Quiriconi and Ted Bennett are the members and many other volunteers chairs of these two committees. At its January 2017 have been planning for the season meeting, the Board approved a budget of up to $5,000 ahead. Here is an update on what’s for engineering and permitting. Even if construction in the works: does not move forward this year, the engineering and permitting work will be useful in the future. First and foremost, I am happy to announce that in late December the Long-Range Planning Committee and the Meanwhile, dredging of Jackson Creek is underway and Flag Officers concluded the search process and hired expected to conclude in several months, depending on a new General Manager. Brian Ankrom, who resides in the weather. This much-needed maintenance is intended White Stone with his wife and children, arrived on the to increase the depth and width of the channel, providing job on January 2nd ready to dive in and become part peace of mind for our larger boat owners and eliminating of FBYC. His educational and professional background in excuses for frequent bottom bumps! Various Jackson recreation and project management bring valuable skills Creek bulkhead repairs, most notably near Fannie’s to the tasks ahead. -
The Sky This Month – Sept 12 to Oct 10, 2018 (Times in EDT) by Chris Vaughan
RASC Toronto Centre – www.rascto.ca The Sky This Month – Sept 12 to Oct 10, 2018 (times in EDT) by Chris Vaughan NEWS Space Exploration – Public and Private Ref. http://spaceflightnow.com/launch-schedule/ Launches Sept 13 at 5:21 pm EDT – Japanese H-2B rocket from Tanegashima Space Center, Japan, payload unmanned cargo vehicle to deliver equipment and supplies to ISS. Sept 15 at 8:46-11:20 am EDT - ULA Delta 2 rocket from Vandenberg Air Force Base, payload NASA’s ICESat 2 investigating ice-sheet elevation change, sea-ice freeboard, and vegetation canopy height. Sept 16 at TBD - India’s Polar Satellite Launch Vehicle from Satish Dhawan Space Center, Sriharikota, India, payload NovaSAR-S radar imaging instrument and SSTL-S1 Earth observation satellites. Sept 25 at TBD - Ariane 5 ECA rocket from Kourou, French Guiana, payload Horizons 3e and Azerspace 2/Intelsat 38 communications satellites. Oct TBD - India’s Geosynchronous Satellite Launch Vehicle Mk. 3 from Satish Dhawan Space Center, Sriharikota, India, payload GSAT 29 communications satellite. Oct 6 at 4:00-5:30 am EDT - Air-launched Northrop Grumman Pegasus XL rocket from Cape Canaveral Air Force Station, payload NASA’s Ionospheric Connection Explorer (ICON) satellite to study the ionosphere. Oct 7 at TBD - SpaceX Falcon 9 rocket from Vandenberg Air Force Base, payload SAOCOM 1A Earth observation satellite for Argentina’s space agency. JUNO at Jupiter Juno is presently executing a series of 53 day orbits. The 15th perijove close pass occurred on September 7. News at https://www.missionjuno.swri.edu/news/ DAWN at Ceres The DAWN spacecraft will exhaust its manoeuvring hydrazine supply any time now, and then remain in orbit around Ceres for decades (at least) to protect Ceres against Earth-contamination. -
Model Based Systems Engineering for a Venture Class Launch Facility
Old Dominion University ODU Digital Commons Mechanical & Aerospace Engineering Theses & Dissertations Mechanical & Aerospace Engineering Fall 11-2020 Model Based Systems Engineering for a Venture Class Launch Facility Walter McGee Taraila Old Dominion University, [email protected] Follow this and additional works at: https://digitalcommons.odu.edu/mae_etds Part of the Mechanical Engineering Commons, and the Systems Engineering and Multidisciplinary Design Optimization Commons Recommended Citation Taraila, Walter M.. "Model Based Systems Engineering for a Venture Class Launch Facility" (2020). Master of Science (MS), Thesis, Mechanical & Aerospace Engineering, Old Dominion University, DOI: 10.25777/ b713-zf77 https://digitalcommons.odu.edu/mae_etds/326 This Thesis is brought to you for free and open access by the Mechanical & Aerospace Engineering at ODU Digital Commons. It has been accepted for inclusion in Mechanical & Aerospace Engineering Theses & Dissertations by an authorized administrator of ODU Digital Commons. For more information, please contact [email protected]. MODEL BASED SYSTEMS ENGINEERING FOR A VENTURE CLASS LAUNCH FACILITY by Walter McGee Taraila B.Sc. May 2012, University of Maryland, College Park A Thesis Submitted to the Faculty of Old Dominion University in Partial Fulfillment of the Requirements for the Degree of MASTER OF SCIENCE MECHANICAL AND AEROSPACE ENGINEERING OLD DOMINION UNIVERSITY December 2020 Approved by: Sharan Asundi (Director) Holly Handley (Member) Miltos Kotinis (Member) ABSTRACT MODEL BASED SYSTEMS ENGINEERING FOR A VENTURE CLASS LAUNCH FACILITY Walter McGee Taraila Old Dominion University, 2020 Director: Dr. Sharan Asundi A study of Model-Based Systems Engineering (MBSE) applied to a small-lift launch facility is presented. The research uses Systems Modeling Language (SysML) products and functional diagrams to document the structure, controls, electrical power, hydraulic, safety mechanisms, softWare, and fluid ground systems on a launch pad. -
Human Origin Sites and the World Heritage Convention in Eurasia
World Heritage papers41 HEADWORLD HERITAGES 4 Human Origin Sites and the World Heritage Convention in Eurasia VOLUME I In support of UNESCO’s 70th Anniversary Celebrations United Nations [ Cultural Organization Human Origin Sites and the World Heritage Convention in Eurasia Nuria Sanz, Editor General Coordinator of HEADS Programme on Human Evolution HEADS 4 VOLUME I Published in 2015 by the United Nations Educational, Scientific and Cultural Organization, 7, place de Fontenoy, 75352 Paris 07 SP, France and the UNESCO Office in Mexico, Presidente Masaryk 526, Polanco, Miguel Hidalgo, 11550 Ciudad de Mexico, D.F., Mexico. © UNESCO 2015 ISBN 978-92-3-100107-9 This publication is available in Open Access under the Attribution-ShareAlike 3.0 IGO (CC-BY-SA 3.0 IGO) license (http://creativecommons.org/licenses/by-sa/3.0/igo/). By using the content of this publication, the users accept to be bound by the terms of use of the UNESCO Open Access Repository (http://www.unesco.org/open-access/terms-use-ccbysa-en). The designations employed and the presentation of material throughout this publication do not imply the expression of any opinion whatsoever on the part of UNESCO concerning the legal status of any country, territory, city or area or of its authorities, or concerning the delimitation of its frontiers or boundaries. The ideas and opinions expressed in this publication are those of the authors; they are not necessarily those of UNESCO and do not commit the Organization. Cover Photos: Top: Hohle Fels excavation. © Harry Vetter bottom (from left to right): Petroglyphs from Sikachi-Alyan rock art site. -
Centreboard Notice of Race & Sailing Instructions
Avalon Sailing Club Limited Old Wharf Reserve 28b Hudson Parade Clareville Beach Centreboard Notice of Race & Sailing Instructions Postal Address: PO Box 59 Avalon Beach NSW 2107 Phone: 02 9918 3637 (Clubhouse) Sundays only Website: www.avalonsailingClub.com.au Email: [email protected] or [email protected] Avalon Sailing Club Mainsheet 2019 - 2020 Table of Contents Centreboard Divisions 3 Blue Division: 3 Red Division: 3 Gold Division: 3 Wind Strengths 3 Safety Notes 3 Advice about Capsizes 4 Advice to Response Boat Operators 5 Section 1 - Notice of Race and Sailing Instructions 6 Section 2 - Course A (Gold AM) 10 Manly Junior, O’pen Skiff, Flying 11, Spiral 11 Sections 3 - Course B (Gold PM) 13 Laser Full Rig, International 420, International 29er, Finn, Spiral, Flying 11 and O’pen Skiffs 13 Race Management 16 A Guide for Spectator Boats 17 A Guide for Coach Boats 18 A Guide for Response Boats 19 Avalon Sailing Club Mainsheet 2019 - 2020 Centreboard Divisions Parents in each group will be rostered on to various duties around the Club, these are Blue Division: your children sailing at your Club and your help is needed to provide a safe and fun Each Sunday between 0800 and 1100hrs, learning environment. children learn the basics of safety and sailing via a three-stage program using the It is the responsibility of competitors to Club’s fleet of Puffin Pacers, Nippas and ensure that their boats comply with their Manly Juniors. Class Rules and in particular those relating to safety equipment. Note: Parents are expected to help and remain at the Club throughout the session. -
Rhode Island's Shellfish Heritage
RHODE ISLAND’S SHELLFISH HERITAGE RHODE ISLAND’S SHELLFISH HERITAGE An Ecological History The shellfish in Narragansett Bay and Rhode Island’s salt ponds have pro- vided humans with sustenance for over 2,000 years. Over time, shellfi sh have gained cultural significance, with their harvest becoming a family tradition and their shells ofered as tokens of appreciation and represent- ed as works of art. This book delves into the history of Rhode Island’s iconic oysters, qua- hogs, and all the well-known and lesser-known species in between. It of ers the perspectives of those who catch, grow, and sell shellfi sh, as well as of those who produce wampum, sculpture, and books with shell- fi sh"—"particularly quahogs"—"as their medium or inspiration. Rhode Island’s Shellfish Heritage: An Ecological History, written by Sarah Schumann (herself a razor clam harvester), grew out of the 2014 R.I. Shell- fi sh Management Plan, which was the first such plan created for the state under the auspices of the R.I. Department of Environmental Management and the R.I. Coastal Resources Management Council. Special thanks go to members of the Shellfi sh Management Plan team who contributed to the development of this book: David Beutel of the Coastal Resources Manage- Wampum necklace by Allen Hazard ment Council, Dale Leavitt of Roger Williams University, and Jef Mercer PHOTO BY ACACIA JOHNSON of the Department of Environmental Management. Production of this book was sponsored by the Coastal Resources Center and Rhode Island Sea Grant at the University of Rhode Island Graduate School of Oceanography, and by the Coastal Institute at the University SCHUMANN of Rhode Island, with support from the Rhode Island Council for the Hu- manities, the Rhode Island Foundation, The Prospect Hill Foundation, BY SARAH SCHUMANN . -
Small Launchers in a Pandemic World - 2021 Edition of the Annual Industry Survey
SSC21- IV-07 Small Launchers in a Pandemic World - 2021 Edition of the Annual Industry Survey Carlos Niederstrasser Northrop Grumman Corporation 45101 Warp Drive, Dulles, VA 20166 USA; +1.703.406.5504 [email protected] ABSTRACT Even with the challenges posed by the world-wide COVID pandemic, small vehicle "Launch Fever" has not abated. In 2015 we first presented this survey at the AIAA/USU Conference on Small Satellites1, and we identified twenty small launch vehicles under development. By mid-2021 ten vehicles in this class were operational, 48 were identified under development, and a staggering 43 more were potential new entrants. Some are spurred by renewed government investment in space, such as what we see in the U.K. Others are new commercial entries from unexpected markets such as China. All are inspired by the success of SpaceX and the desire to capitalize on the perceived demand caused by the mega constellations. In this paper we present an overview of the small launch vehicles under development today. When available, we compare their capabilities, stated mission goals, cost and funding sources, and their publicized testing progress. We also review the growing number of entrants that have dropped out since we first started this report. Despite the COVID-19 pandemic, one system became operational in the past 12 months and two or three more systems hope to achieve their first successful launch in 2021. There is evidence that this could be the year when the small launch market finally becomes saturated; however, expectations continue to be high and many new entrants hope that there is room for more providers. -
High-Performance Solid Carbide End Mill Catalog
High-Performance Solid Carbide End Mill Catalog 3rd Edition GUHRING USA USA Headquarters California Distribution Center and Reconditioning Facility Brookfield Distribution Center, manufacturing and 15581 Computer Lane Reconditioning Facility Huntington Beach, CA 92649 1445 Commerce Avenue Tel (714) 841-3582 Brookfield, WI 53045 Fax (800) 877-7202 Tel (262) 784-6730 (800) 776-6170 Fax (262) 784-9096 Dear customers, Highest productivity, excellent economic efficiency and optimum machining results are the principles to which we steer our products and services towards. At Guhring this is achieved with great success by more than of 5,000 employees world-wide. Their objective is customer satisfaction and this makes Guhring the leading world wide manufacturer of rotary cutting tools. YOU BENEFIT IN MANY WAYS: Pooled expertise With Guhring tools you can rely on the tool material, the geometry and the coating – the essential parameters for the efficiency of a precision tool – to be perfectly coordinated. Our own carbide production, our own machine and equipment construction, our own coating technology as well as our own development departments ensure we maintain technological leadership in rotary cutting tools. Within the framework of our special tool production we develop optimized tools with an excellent price-performance-ratio for our customers. 2 Connecticut Reconditioning Facility Michigan Manufacturing and Reconditioning Facility 121 W Dudley Town Rd. 29550 W.K. Smith Rd. Suite B Bloomfield, CT 06002 New Hudson, MI 48165 Tel (860) 216-5948 Tel (248) 486-3783 Fax (860) 519-5819 Fax (248) 486-0046 Trend-setting innovations In excess of 600 granted patents world-wide are proof of our capability for innovation. -
The-Recitals-October-2019.Pdf
Dear Students The preparation of current affairs magazine is an evolutionary process as its nature and content keeps changing according to the demands of Civil Service Exam. As you are aware about the importance of current affairs for the prelims as well as mains exam, our aim is to follow an integrated approach covering all stages of examination from prelims to interview. Keeping these things in mind, we, at Vajiram and Ravi Institute, are always in the process of evolving our self so as to help aspirants counter the challenges put forward by UPSC. In fulfillment of our objective and commitment towards the students, we have introduced some changes in our current affairs magazine. The CA Magazines, now with the name of “The Recitals”, will have four sections. These are: 1. Feature Article: As you are aware of the fact that civil service mains exam has become quite exhaustive and analytical, especially since 2013 after the change in syllabus, we have decided to focus on 2-3 topics every month that will provide an insight into the issue so as to help students understand the core of the issue. This will help in Essay writing as well as Mains Exam. 2. Mains Q&A: New students quite often struggle to find out that in what way the given topic is useful for them and in what form questions can be framed from the article. To help those students, we at Vajiram and Ravi have designed an innovative way to teach current affairs. Now, we will cover the current issues through questions and answers so as to make it more targeted towards exam. -
Assessment of the Impact of Air Launch Operations on Air Traffic in Europe
Space Traffic Management Conference 2019 Progress through Collaboration Feb 26th, 9:15 AM Assessment of the Impact of Air Launch Operations on Air Traffic in Europe Sven Kaltenhaeuser German Aerospace Center, [email protected] Tanja Luchkova German Aerospace Center Niklas Klay German Aerospace Center Rui Bin Randy Ang Nanyang Technological University, Singapore Follow this and additional works at: https://commons.erau.edu/stm Part of the Management and Operations Commons Kaltenhaeuser, Sven; Luchkova, Tanja; Klay, Niklas; and Ang, Rui Bin Randy, "Assessment of the Impact of Air Launch Operations on Air Traffic inur E ope" (2019). Space Traffic Management Conference. 16. https://commons.erau.edu/stm/2019/presentations/16 This Event is brought to you for free and open access by the Conferences at Scholarly Commons. It has been accepted for inclusion in Space Traffic Management Conference by an authorized administrator of Scholarly Commons. For more information, please contact [email protected]. 5th Annual Space Traffic Management Conference “Progress through Collaboration”, UT Austin, Texas, 26.-27. February 2019 Assessment of the Impact of Air Launch Operations on Air Traffic in Europe Sven Kaltenhaeuser1), Tanja Luchkova1), Niklas Klay1), R. B. R. Ang2) 1)Deutsches Zentrum für Luft- und Raumfahrt, German Aerospace Center (DLR), [email protected] 2) Nanyang Technological University (NTU), Singapore Keywords: commercial space transportation, airspace, fast-time simulation, air launch, air traffic impact ABSTRACT to be considered regarding separation assurance. To ensure safety, parts of the airspace must be blocked for this purpose or other precautious measures have to be taken. The numerical and The development in commercial space transportation is strongly spatial expansion of space flight activities therefore represents a driven by a growing demand for payload capacities and cost challenge for air traffic control and air traffic management [1]. -
Launch Uncertainty
GRANT R. CATES Grant R. Cates is a senior engineering specialist at The Aerospace Corporation in Chantilly, Virginia. He has more than 30 years of experience in space launch and simulation modeling. His recent work and publications have focused on the use of discrete event simulation to advise the Air Force on future launch rates and NASA on the space shuttle, the International Space Station, human exploration of the solar system, and launch probability. Cates received a bachelor’s degree in engineering science from Colorado State University and a master’s degree and Ph.D. in industrial engineering from the University of Central Florida. DANIEL X. HOUSTON Daniel X. Houston is a senior project leader at The Aerospace Corporation in El Segundo, California. He applies qualitative and quantitative analytical methods, including statistics and simulation, to industrial and software engineering processes. Houston received a B.S. in mechanical engineering from The University of Texas at Austin and a master’s degree and Ph.D. in industrial engineering at Arizona State University. His publications include statistical modeling and simulation of software development processes, software process improvement, and the management of software projects, with a focus on risk, product quality, and economics. DOUGLAS G. CONLEY Douglas G. Conley is chief engineer of Launch Program Operations at The Aerospace Corporation in El Segundo, California. He has been engaged in domestic and international space launch programs spacecraft systems engineering, and mission assurance for over 35 years, mostly in the commercial realm before joining Aerospace in 2016. Conley received a B.S. in engineering and applied science from Caltech and a master’s degree in dynamics and control from the University of California, Los Angeles.