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Toy Gun Eye Injuries – Eye Protection Needed Helsinki Ocular Trauma Study
Acta Ophthalmologica 2018 Toy gun eye injuries – eye protection needed Helsinki ocular trauma study Anna-Kaisa Haavisto, Ahmad Sahraravand, Paivi€ Puska and Tiina Leivo, University of Helsinki and Helsinki University Eye Hospital, Helsinki, Finland ABSTRACT. irideal tear and changes in intraocular Purpose: We report the epidemiology, findings, treatment, long-term outcome pressure (IOP) (Fleischhauer et al. and use of resources for eye injuries caused by toy guns in southern Finland. 1999; Saunte & Saunte 2006; Ram- Methods: All new patients injured by toy guns in one year (2011–2012) and stead et al. 2008; Kratz et al. 2010; treated at Helsinki University Eye Hospital were included. Follow-ups occurred Jovanovic et al. 2012; Haavisto et al. at 3 months and 5 years. 2017). Globe ruptures have been Results: Toy guns caused 15 eye traumas (1% of all eye traumas). Most patients reported from paintballs and also a were male (n = 14) and children aged under 16 years (n = 13). Toy guns few cases from airsoft guns (Greven & = = = Bashinsky 2006; Adyanthaya et al. involved were airsoft guns (n 12), pea shooters (n 2) and paintball (n 1). Eleven patients did not use protective eyewear, and four patients discontinued 2012; Jovanovic et al. 2012; Nemet et al. 2016). Optic neuropathies have their use during the game. Seven patients were not active participants in the also arisen from paintballs (Thach game. Blunt ocular trauma was the primary diagnosis in 13 patients and corneal et al. 1999). Traumatic glaucoma may abrasion in two. Seven patients had retinal findings. In the 5-year follow-up, present even years after a blunt ocular eight of 15 patients had abnormal ocular findings: three had artificial intraocular trauma (Kaufman & Tolpin 1974; lens, two iridodialysis, and one each retinal plomb, mydriasis or iris tear. -
Baseball Science Fun Sheets
WASHINGTON NATIONALS BASEBALL SCIENCE FUN SHEETS E SID AC T T U I V O I T Aerodynamics Y INTRODUCTION What is the difference between a curveball, fastball and cutter? In this lesson, students will KEY WORDS learn about the aerodynamic properties of a ball • Axis of Rotation in flight and the influence of spin on its trajectory. • Magnus Effect OBJECTIVES • Curveball • Determine the trajectory of different pitches. • Simulate different types of pitches using a ball. • Fastball • Explain why baseballs curve (Magnus Effect). KEY CONCEPTS • Aerodynamics is about the way something FOCUS STANDARDS moves when passing through air. In this Relates to Line of Symmetry: activity, students will measure the effect of changing the way a ball moves through air by CCSS.MATH.CONTENT.4.G.A.3 where it ends up. • Draw lines of symmetry of a ball. Relates to Coordinate Graphs: • Plot the distance a ball curves from the center CCSS.MATH.CONTENT.5.G.A.2 line. MATERIALS • Worksheet • Ball (beachball if available) • Tape Measure • Coins & Tape Aerodynamics PROCEDURE 1. Show a Magnus Effect video to engage the students. 2. Provide students with paper and tape. Roll the paper to create a hollow cylinder. 3. On a tilted platform, release the roll of paper. 4. The rotation of the paper and Magnus Effect will cause the cylinder to spin as it falls towards the floor. PROCEDURE 5. Draw a line1. S hofow symmetry the Magnus E fonfect thevideo ball to understand the rotational axis (vertical vs. horizontal). a. Provide students with paper and tape. Roll the paper to create a hollow cylinder. -
Describing Baseball Pitch Movement with Right-Hand Rules
Computers in Biology and Medicine 37 (2007) 1001–1008 www.intl.elsevierhealth.com/journals/cobm Describing baseball pitch movement with right-hand rules A. Terry Bahilla,∗, David G. Baldwinb aSystems and Industrial Engineering, University of Arizona, Tucson, AZ 85721-0020, USA bP.O. Box 190 Yachats, OR 97498, USA Received 21 July 2005; received in revised form 30 May 2006; accepted 5 June 2006 Abstract The right-hand rules show the direction of the spin-induced deflection of baseball pitches: thus, they explain the movement of the fastball, curveball, slider and screwball. The direction of deflection is described by a pair of right-hand rules commonly used in science and engineering. Our new model for the magnitude of the lateral spin-induced deflection of the ball considers the orientation of the axis of rotation of the ball relative to the direction in which the ball is moving. This paper also describes how models based on somatic metaphors might provide variability in a pitcher’s repertoire. ᭧ 2006 Elsevier Ltd. All rights reserved. Keywords: Curveball; Pitch deflection; Screwball; Slider; Modeling; Forces on a baseball; Science of baseball 1. Introduction The angular rule describes angular relationships of entities rel- ative to a given axis and the coordinate rule establishes a local If a major league baseball pitcher is asked to describe the coordinate system, often based on the axis derived from the flight of one of his pitches; he usually illustrates the trajectory angular rule. using his pitching hand, much like a kid or a jet pilot demon- Well-known examples of right-hand rules used in science strating the yaw, pitch and roll of an airplane. -
Investigation of the Factors That Affect Curved Path of a Smooth Ball
View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by TED Ankara College IB Thesis Oğuz Kökeş D1129‐063 Physics Extended Essay Investigation Of The Factors That Affect Curved Path Of A Smooth Ball Oğuz Kökeş D1129‐063 School: TED Ankara Collage Foundation High School Supervisor: Mr. Özgül Kazancı Word Count: 3885 1 Oğuz Kökeş D1129‐063 Abstract This essay is focused on an investigation of spin(revolution per second) of a ball and its effect on the ball’s curved motion in the air. When a ball is hit and spinning in the air, it leaves its straight route and follows a curved path instead. In the following experiment the reasons and results of this curved path (deflection) is examined. In the experiment, the exerted force on the ball and its application point on the ball is changed. The ball was hit by 3 different tension levels of a spring mechanism and their deflection values were measured. Spin of the ball was also recorded via a video camera. Likewise, the location of the spring mechanism was also changed to hit from close to the end and the geometric center of the ball. The spin of the ball was also recorded and its deflection was measured. By analysing this experiment, one can see that the spin of a ball is an important factor in its curve. The curve of a ball can be increased by spinning it more in the air. So to create more spin one can increase the exerted force on the ball or apply the force close to the end of the ball. -
Computational Turbulent Incompressible Flow
This is page i Printer: Opaque this Computational Turbulent Incompressible Flow Applied Mathematics: Body & Soul Vol 4 Johan Hoffman and Claes Johnson 24th February 2006 ii This is page iii Printer: Opaque this Contents I Overview 4 1 Main Objective 5 2 Mysteries and Secrets 7 2.1 Mysteries . 7 2.2 Secrets . 8 3 Turbulent flow and History of Aviation 13 3.1 Leonardo da Vinci, Newton and d'Alembert . 13 3.2 Cayley and Lilienthal . 14 3.3 Kutta, Zhukovsky and the Wright Brothers . 14 4 The Navier{Stokes and Euler Equations 19 4.1 The Navier{Stokes Equations . 19 4.2 What is Viscosity? . 20 4.3 The Euler Equations . 22 4.4 Friction Boundary Condition . 22 4.5 Euler Equations as Einstein's Ideal Model . 22 4.6 Euler and NS as Dynamical Systems . 23 5 Triumph and Failure of Mathematics 25 5.1 Triumph: Celestial Mechanics . 25 iv Contents 5.2 Failure: Potential Flow . 26 6 Laminar and Turbulent Flow 27 6.1 Reynolds . 27 6.2 Applications and Reynolds Numbers . 29 7 Computational Turbulence 33 7.1 Are Turbulent Flows Computable? . 33 7.2 Typical Outputs: Drag and Lift . 35 7.3 Approximate Weak Solutions: G2 . 35 7.4 G2 Error Control and Stability . 36 7.5 What about Mathematics of NS and Euler? . 36 7.6 When is a Flow Turbulent? . 37 7.7 G2 vs Physics . 37 7.8 Computability and Predictability . 38 7.9 G2 in Dolfin in FEniCS . 39 8 A First Study of Stability 41 8.1 The linearized Euler Equations . -
Operator's Manual
MMPS15_G36C V01 R2011.08.22 ® OPERATOR’S MANUAL KWA Performance Industries, Inc. 18571 E. Gale Ave City of Industry, CA 91748 T: 626.581.1777 • F: 626.581.0777 G36C www.kwausa.com Copyright © May, 2011 KWA Performance Industries, Inc. All Rights Reserved. Official H&K licensed product. Umarex holds the worldwide exclusive HK-Tradmark and exterior design copy license for use with this Umarex product, granted by HK, Inc., U.S.A. H&K G36C TABLE OF CONTENTS PARTS LIST Parts # Description Parts # Description Parts # Description Use of this manual ...........................................................................................2 199-1001-M36 TRIGGER SWITCH CONTACT 199-1001-M48 MAIN SPRING TRIGGER SAFETY BLOCK 199-1001-M120 199-1001-M37 PISTON HEAD 199-1001-M97 HI-TORQUE BEVEL GEAR SCREW 199-1001-M38 PISTON HEAD GUIDE 199-1001-M101 HI-TORQUE SPUR GEAR 199-1001-M122 TRIGGER SWITCH PIN Safety Guidelines ........................................................................................ 2-3 199-1001-M39 SPRING GUIDE END CAP 199-1001-M107 HI-TORQUE SECTOR GEAR 199-1001-M123 PISTON HEAD O-RING 199-1001-M40 SPRING GUIDE 199-1001-M113 OUTER SIDE PLATE SCREW 199-1001-M124 CYLINDER HEAD O-RING Warranty and Service .................................................................................. 4-5 199-1001-M42 TAPPET PLATE SPRING 199-1001-M114 FRONT WIRE HARNESS SCREW 199-1001-M125 BEARING BUSHING TRIGGER SWITCH RETURN 199-1001-M115 MECH BOX SCREW (SHORT) 199-1001-M127 SPRING GUIDE WASHER 199-1001-M43 SPRING 199-1001-M116 MECH BOX SCREW -
A Review of the Magnus Effect in Aeronautics
Progress in Aerospace Sciences 55 (2012) 17–45 Contents lists available at SciVerse ScienceDirect Progress in Aerospace Sciences journal homepage: www.elsevier.com/locate/paerosci A review of the Magnus effect in aeronautics Jost Seifert n EADS Cassidian Air Systems, Technology and Innovation Management, MEI, Rechliner Str., 85077 Manching, Germany article info abstract Available online 14 September 2012 The Magnus effect is well-known for its influence on the flight path of a spinning ball. Besides ball Keywords: games, the method of producing a lift force by spinning a body of revolution in cross-flow was not used Magnus effect in any kind of commercial application until the year 1924, when Anton Flettner invented and built the Rotating cylinder first rotor ship Buckau. This sailboat extracted its propulsive force from the airflow around two large Flettner-rotor rotating cylinders. It attracted attention wherever it was presented to the public and inspired scientists Rotor airplane and engineers to use a rotating cylinder as a lifting device for aircraft. This article reviews the Boundary layer control application of Magnus effect devices and concepts in aeronautics that have been investigated by various researchers and concludes with discussions on future challenges in their application. & 2012 Elsevier Ltd. All rights reserved. Contents 1. Introduction .......................................................................................................18 1.1. History .....................................................................................................18 -
An Ordinance of the City of Saginaw Amending Article Ii Of
ORDINANCE NO. 2018- 04 AN ORDINANCE OF THE CITY OF SAGINAW AMENDING ARTICLE II OF CHAPTER 54 OF THE SAGINAW CITY CODE, " DISCHARGE OF CERTAIN WEAPONS" TO ADD REGULATIONS FOR THE DISCHARGE OF FIREARMS, SPRING GUNS, OR OTHER DANGEROUS WEAPONS; PROVIDING THAT THIS ORDINANCE SHALL BE CUMULATIVE; PROVIDING A SEVERABILITY CLAUSE; PROVIDING FOR A SAVINGS CLAUSE; PROVIDING A PENALTY CLAUSE; PROVIDING FOR PUBLICATION IN THE OFFICIAL NEWSPAPER; AND PROVIDING AN EFFECTIVE DATE. WHEREAS, the City of Saginaw, Texas is a home rule City acting under its Charter adopted by the electorate pursuant to Article XI, Section 5 of the Texas Constitution and Chapter 9 of the Local Government Code; and WHEREAS, the City of Saginaw, Texas has a substantial interest in protecting the health, safety, welfare of the general public; and WHEREAS, the City of Saginaw, Texas finds its current regulations regarding the discharge of certain weapons within the City to be in need of updating to include the discharge of firearms, spring guns, and other dangerous weapons; and WHEREAS, the City of Saginaw, Texas finds that enacting these amendments to be necessary in protecting the health, safety, welfare of the general public; and NOW, THEREFORE, BE IT ORDAINED BY THE CITY COUNCIL OF THE CITY OF SAGINAW, TEXAS: SECTION 1. Article II of Chapter 54 of the Saginaw City Code, " Discharge of Certain Weapons", is hereby amended to read as follows: ARTICLE II. DISCHARGE OF CERTAIN WEAPONS Sec. 54- 31. Definitions. As used in this article, the following terms shall have the respective meanings ascribed to them: a) Archery equipment means any weapon consisting of a curved, flexible strip of material with a cord, cable or string strung taut between the two ends in which to discharge an arrow, bolt or other similar object and shall be held to include, but not be limited to, the following: bow, compound bow, crossbow, long bow, recurve bow or other similar weapons. -
The NAM Issue 004.Pdf
The underground magazine for airsoft players by airsoft players Issue #4 Q4 2004 $6.00 USD In this issue: OPERATION: BIOHAZARD battletech: The perfect hop-up! The armory: Top’s m249 Sgt. Pecker Vs The liberal HEAVYARMS: True squad support (Part I) ak babe q4 2004: The NAM wishes you a very Merry Christmas! Battletech: Secret tips and tricks For your AEGs! FIELD TESTED: Tanaka M24 TOP AK Drum magazine Interrogation Room All things airsoft: Airsoftgunhelp.com The underground magazine for airsoft players by airsoft players 2 www.NationalAirsoftMagazine.com The underground magazine for airsoft players by airsoft players Briefing: Greetings and welcome to the this issue for more details on the fourth installment of: Op and how to register for next year’s (this year if you’re reading this in 2005) Halloween event! I’d just like to close by wishing you all, all the best and a very heartfelt Merry Christmas (Happy Christmas to all you Redcoats!), Happy Hanukkah, Winter Solstice or whatever you celebrate! And if you don’t celebrate the holidays, you should! Make something up if you’ve Wow, it’s almost hard to believe gotta! Happy Holidays and we’ll see we’ve been at this thing a whole you all March of 2005 with Issue #5! year now. Then again, when I reflect on the “crunch time” compilation, it’s not so hard to Cheers, believe (joking…sort’a). On a personal note, I’d like to thank everyone who’s been there since our Reaper very first issue, those generous people who’ve helped us and moved on, and those who’ve jumped aboard this locomotive in full motion (very brave) and managed to stay aboard! But most importantly, I’d like to thank our readers. -
Numerical Investigation of the Magnus Effect on Dimpled Spheres
NUMERICAL INVESTIGATION OF THE MAGNUS EFFECT ON DIMPLED SPHERES Nikolaos Beratlis Elias Balaras Mechanical and Aerospace Engineering Department of Mechanical Arizona State University and Aerospace Enginering Tempe, AZ, USA George Washington University [email protected] Washington, DC, USA [email protected] Kyle Squires Mechanical and Aerospace Enginering Arizona State University Tempe, AZ, USA [email protected] ABSTRACT 0.5 An efficient finite-difference, immersed-boundary, k 0.4 3 k2 Navier-Stokes solver is used to carry out a series of sim- k1 ulations of spinning dimpled spheres at three distinct flow 0.3 D regimes: subcritical, critical and supercritical. Results exhibit C 0.2 all the qualitative flow features that are unique in each regime, golf ball smooth namely the drag crisis and the alternation of the Magnus 0.1 effect. 0 5 6 10 Re 10 Figure 1. Variation of CD vs Re for a smooth sphere Achen- INTRODUCTION bach (1972), –; spheres with sand-grained roughness Achen- Golf ball aerodynamics are of particular importance not −5 −5 bach (1972), −− (k1 = k=d = 1250×10 , k2 = 500×10 , only due to the quest for improved performance of golf balls − k = 150 × 10 5); golf ball Bearman & Harvey (1976), ·−. but also because of the fundamental phenomena associated 3 with the drag reduction due to dimples. Dimples are known to lower the critical Reynolds number at which a sudden drop in the drag is observed. Figure 1, for example, shows the tion caused by dimples. Using hot-wire anemometry they drag coefficient, CD, as a function of the Reynolds number, measured the streamwise velocity within individual dimples Re = UD=n, (where D is the diameter of the golf ball, U the and showed that the boundary layer separates locally within velocity and n the kinematic viscosity of the air) for a golf ball the dimples. -
Karlstad University Faculty for Health, Science and Technology Mathematics of Football Free Kicks Analytic Mechanics FYGB08
Karlstad University Faculty for Health, Science and Technology Robin Lundström February 4, 2019 Mathematics of football free kicks Analytic Mechanics FYGB08 Abstract A direct free kick is a method of restarting play in a game of football that is awarded to a team following a foul from the opposing team. Free kicks are situations that professional footballers have been practicing daily, with world class coaches, for the majority of their life, however the conversion rate of a free kick is somewhere between 0 − 10% depending on where the free kick is taken. In this report the physics of free kicks was investigated by analyzing a ball of which gravitational force, drag force and the Magnus force were acting on the ball. The purposes of the report were to both describe the trajectory of a football and to investigate the low conversion rate of direct free kicks. The mathematics of free kicks was implemented in MatLab and simulations are consistent with the physical intuition experienced when watching a game. It was concluded that small deviations of the initial conditions made a great impact on the trajectory. 1 Contents 1 Introduction 2 2 Theory 2 2.1 Declaration of variables and notation.....................................2 2.2 Gravitational force...............................................3 2.3 Drag force....................................................4 2.4 The Magnus effect...............................................4 3 Method 5 4 Results 5 4.1 Implementing forces in Matlab........................................5 4.2 Implementing a football freekick in Matlab.................................7 4.2.1 The wall.................................................7 4.2.2 The goalkeeper.............................................7 4.3 Simulation results...............................................7 4.3.1 Different models............................................8 4.4 Monte Carlo simulations............................................8 5 Discussion 11 5.1 Conclusion.................................................. -
Gelsoft-Blaster Gelsoft-Blaster
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