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Mohazzabi, P., and J. C. Fields. "High-altitude projectile motion." Canadian Journal of Physics 82, no. 3 (March 1, 2004): 197–204. http://dx.doi.org/10.1139/p04-001.
It is known that the optimal projection angle corresponding to the maximum range of a projectile moving in air is less than 45° for low-power resistance laws such as the linear or quadratic law. We show that this result is valid only for a uniform atmosphere, in which the density of air is a constant. In a more realistic atmosphere, such as an exponential atmosphere, where the air density decreases with altitude, and specially for high-speed projectiles, the optimal projection angle is much greater than 45°.PACS No.: 45.50.Dd
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Mohazzabi, Pirooz, and Tarisa N. Lerro. "Projectile motion in the “exponential atmosphere”: approximate trajectories." Canadian Journal of Physics 84, no. 4 (April 1, 2006): 299–309. http://dx.doi.org/10.1139/p06-055.
Approximate trajectories for projectile motion in an “exponential atmosphere” are discussed. It is shown that for low speeds (compared with the speed of sound) an excellent fit of the data can be accomplished with a two-parameter quartic equation as well as an earlier-suggested three-parameter cubic equation. For high-speed projectiles launched at low angles (compared with 45°) these models are insufficient and more terms must be added in each case. High-speed projectiles launched at high projection angles, on the other hand, can be very accurately modeled by parabolic trajectories.PACS No.: 45.50.Dd
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Zhao, Xuefeng, Xujian Lyu, and Da Li. "Modeling of the Tail Slap for an Underwater Projectile within Supercavitation." Mathematical Problems in Engineering 2019 (May 21, 2019): 1–10. http://dx.doi.org/10.1155/2019/1290157.
Detailed process of the tail slap for an underwater projectile in supercavitation is studied in this paper. Firstly, the horizontal equation of motion for the projectile and a dynamic model of the projectile’s tail slap are introduced through a mathematical derivation, including a simple harmonic motion model of the projectile within the supercavitation layer and the tail slap reflection movement model inside the cavity. Subsequently, the MATLAB software package is used to model the projectile’s motion. Characteristics for force from the projectile tail on the water layer during a single tail slap and the behavior of the projectile’s angular motion as well as the characteristics of projectile tail motion through multiple tail slaps are investigated. It is found that the force magnitude of the water on the projectile tail decreases gradually while the relative motion angle of the projectile tail into the water layer and the contact time increase obviously as the projectile repeatedly slaps the cavity interface. When the projectile velocity decreases into a certain range, i.e., less than 50 m/s, the contact time of the tail in the water layer increases dramatically, and the supercavitation can tend to collapse and lead to unstable projectile motion. With increasing lateral deviation and angular velocity of the projectile tail, the number of tail slaps and the angle of reflection both increase significantly. In the case of supercavitation, the parameters of different tail slap points tend to be stable with time.
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S, Vivek, Rohini R, and Dhanya G. "A Case Study on Projectile Motion." International Journal of Trend in Scientific Research and Development Volume-2, Issue-3 (April 30, 2018): 136–41. http://dx.doi.org/10.31142/ijtsrd10839.
Величко Лев Дмитрович, Горчинський Ігор Володимирович та Сорокатий Микола Іванович. "ЗОВНІШНЯ БАЛІСТИКА СНАРЯДУ БМ1 ВИПУЩЕНОГО З Т-12 (МТ-12)". World Science 1, № 1(53) (31 січня 2020): 23–29. http://dx.doi.org/10.31435/rsglobal_ws/31012020/6891.
The magnitudes of the kinematic parameters of projectiles motion in the air depends on deterministic (form of projectile, its mass, temperature of air and charge, atmospheric pressure, derivation) and nondeterministic (muzzle velocity, magnitude and direction of wind velocity) values. During the projectile movement, its weight and frontal air resistance force have a determining influence on its dynamics. In the article it is investigated proposed by authors the mathematical model of determination of the functional dependence of the magnitude of the frontal air resistance force of the projectile’s motion on its velocity, mass and caliber, geometric characteristics, temperature and density of air, atmospheric pressure, sound speed in air. Since the trajectory of movement of the BM1 projectile released from the T-12 (MT-12) is canopy, it is assumed that during the projectile’s flight the air temperature and atmospheric pressure are unchanged and equal to their value at the point of the gun.
Youch, Daniel F. "Efficient calculation of earth penetrating projectile trajectories." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2006. http://library.nps.navy.mil/uhtbin/hyperion/06Sep%5FYouch.pdf.
Thesis (M.S. in Mechanical Engineering)--Naval Postgraduate School, September 2006. Thesis Advisor(s): Joshua Gordis. "September 2006." Includes bibliographical references (p. 101). Also available in print.
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Reed, Nick. "The visual perception of projectile trajectories and the guidance of interceptive behaviour." Thesis, University of Oxford, 2002. http://ora.ox.ac.uk/objects/uuid:ad880dbb-1016-4e30-a585-bb0f9ef253b1.
Experiments were conducted examining human interception of projectiles. It was found that fielders tend not maintain a linear optic trajectory (LOT) as advocated by McBeath, Shaffer, and Kaiser (1995) for interception in two-dimensions. Furthermore, it was shown that its curvature provided an ambiguous cue to action. New interception models were proposed based on optic acceleration cancellation (OAC) and the constant δ model significantly improved upon the performance of the LOT model. Awareness of interception strategy was investigated by questioning subjects about their angle of gaze variation during the ball flight. A lack of awareness of the critical information that guides interceptive behaviour was demonstrated. It is proposed that the information is stored implicitly, challenging the position of Shanks and St. John (1994). Subjects were asked to discriminate the visual information that they experienced before running to catch real balls to examine the validity of experiments that test human ability to discriminate the acceleration of simulated trajectories. Discriminative performance found to remain high even when the duration of viewed information is reduced. This intact discriminative ability led to the suggestion that trajectory discrimination occurs very rapidly after ball launch. The movement and gaze angle of fielders running to catch under conditions in which OAC cannot be sustained was analysed. Subjects showed little deviation from the strategy until the final moments of the catch. The overall conclusion to the thesis is that subjects react rapidly to the optic acceleration of a projectile to determine interceptive behaviour but may not be aware of the sensory basis of their decision and use an approximate version of the constant δ strategy to reach the interception point.
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Brown, T. Gordon, Ed Bukowski, Mark Ilg, and Fred Brandon. "MEASUREMENT OF IN-FLIGHT MOTION CHARACTERISTICS OF A HIGH-G LAUNCHED FLARESTABILIZED PROJECTILE WITH ON-BOARD TELEMETRY." International Foundation for Telemetering, 2007. http://hdl.handle.net/10150/604268.
ITC/USA 2007 Conference Proceedings / The Forty-Third Annual International Telemetering Conference and Technical Exhibition / October 22-25, 2007 / Riviera Hotel & Convention Center, Las Vegas, Nevada In pursuit to understanding the flight behavior and characterizing the stability of a flarestabilized projectile, an experiment was conducted to assess the robustness of an inertial sensor suite the size of a dime (17.5mm) by integrating to a telemetry system for recording. The system had to survive launch acceleration exceeding 25,000G’s. This is the beginning of an effort to reduce the size of telemetry systems and diagnostic devices for use in medium caliber munitions and smaller. A description of the telemetry system and subsystem will be presented along with the results.
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Gombi, Alessandro. "The foundational case of the parabolic motion: design of an interdisciplinary activity for the IDENTITIES project." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/21181/.
Questa tesi si inserisce nel campo di ricerca in Didattica della Fisica. In particolare, il lavoro si colloca all’interno del progetto Erasmus+ IDENTITIES, avviato nel settembre 2019, in collaborzione con le università di Montpellier, Creta, Parma e Barcellona. IDENTITIES ha lo scopo di sviluppare moduli didattici interdisciplinari (fisica – matematica – informatica), rivolti ai futuri insegnanti. I moduli riguardano sia temi curricolari sia temi STEM come contesto in cui sviluppare competenze interdisciplinari e progettare nuovi modelli di co-teaching.
I temi di IDENTITIES hanno ispirato e guidato l’attuazione di un corso rivolto a insegnanti di scuola secondaria di secondo grado, organizzato dal PLS di Fisica di Bologna assieme al PLS di Matematica e il POT di Bologna. Il corso, svoltosi tra novembre e dicembre 2019 ha rappresentato la principale fonte di materiale e di riflessioni per questo lavoro.
L’obiettivo di questa tesi è contribuire al progetto tramite la creazione di un’attività didattica, rivolta ai futuri insegnanti, sul tema della parabola e del moto parabolico. L’attività è stata progettata con lo scopo di guidare attraverso i principali passaggi che hanno caratterizzato, da un punto di vista epistemologico, l’evoluzione del pensiero fisico dalla teoria sul moto del proiettile di Tartaglia fino alla dimostrazione della traiettoria parabolica del proiettile di Galileo.
Nella tesi sono descritti il quadro teorico di base per il lavoro, la rielaborazione del materiale del corso PLS per costruire lenti per l’analisi dei libri di testo, l’analisi di un capitolo del libro di testo sulla cinematica bidimensionale e la conseguente progettazione dell’attività didattica. Nelle conclusioni sono discussi i principali risultati ottenuti, tra i quali la produzione delle griglie originali per l’analisi di libri di testo, l’individuazione della simmetria e dell’indipendenza dei moti come attivatori epistemologici e la produzione dell’attività.
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Alexiou, John. "Projective articulated dynamics." Thesis, Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/19658.
Takagi, S., H. Sasaki, M. Shikida, and K. Sato. "Electrostatic Latch Mechanism for Handling Projection on Arrayed Vertical Motion System." IEEE, 2007. http://hdl.handle.net/2237/9556.
Current and future animations seek for realistic motions to create an illusion of authentic and believable animations. A technology widely used to support this process is motion capture. Therefore, motion capture actors are used to enrich the movements of digital avatars with suitable and believable motions and emotions. Acting for motion capture, as it is performed today, is a challenging work environment for actors and directors. Short preparation times, minimalistic scenery, limited information about characters and the performance as well as memorizing movements and spatial positions requires actors who are trained and able to highly rely on their acting and imagination skills. In many cases these circumstances can lead to performances with unnatural motions such as stiff looking and emotionless movements, as well as less believable characters. To compensate this, time-consuming repetitions of performances or post-processing of motion capture recordings is needed. To improve this, we explore the possibilities of acting support and immersion through an interactive system supporting motion capture actors during their performances. In this process, we use an approach that combines research methods from interaction design and computer science. For our research, we firstly identify the challenges actors are facing in motion capture, as well as suggest possible concepts to support the actors. Thereafter, we explore initial prototypes built to support actors during their performance in a motion capture studio. The resulting insights from these initial prototypes led to the design exploration and development of a mixed reality head-mounted projection display that allows showing virtual scenery to the actors and provides real-time acting support. Thereafter, we describe our developed mixed reality application and our findings on how hardware and software prototypes can be designed as acting support, usable in a motion capture environment. A working prototype allowing to evaluate actors' experiences and performances was built as a proof-of-concept. Additionally, we explored the possibility to use our developed mixed reality prototype in other fields and investigated its applicability for computer games and as an industrial simulator application. Finally, we conducted user studies with traditionally trained theatre and TV actors, experienced motion capture actors and experts, evaluating the experiences with our prototype. The results of these user studies indicate that our application makes it easier for motion capture actors to get into demanded moods and to understand the acting scenario. Furthermore, we show a prototype that complies with the requirements of a motion capture environment, that has the potential to improve motion capture acting results and supports actors with their performances.
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Triquell, Ximena. "Projecting history : a socio-semiotic approach to the representations of the military dictatorship (1976-1983) in the cinematic discourses of Argentine democracy." Thesis, University of Nottingham, 2000. http://eprints.nottingham.ac.uk/11710/.
This thesis analyzes a series of films that, in different ways, seek to represent the last Argentine dictatorship. The possibility of interpreting the thematic and formal recurrences of the films as a defining characteristic of a specific genre is posed as a first hypothesis. The second hypothesis postulates the possibility of relating certain aesthetic and rhetorical changes of the series to certain socio-political processes. After presenting a general overview of some of the various forms in which the relationship between cinema and society has been theorized before, the work proposes the instance of enunciation as a principle of articulation between textual and social systems, analysing the subjects involved in each of these levels and the relationship that can be established between them. The apparatus of enunciation (between textual figures), which can be related to the reading contract (between social subjects) can also be associated with the notion of genre. In this context, the thesis explores the possibility of a redefinition of cinematographic genres from the perspective of the Semiotics of Passions. Having established in the previous chapters the theoretical and methodological basis, the second part of the work consists of the analysis of the enunciation in the films of the corpus, in order to establish the main characteristics of the reading contract proposed to the spectator. The analysis starts with the consideration of the genre known in television as "docudrama", paying particular attention to the relationship between what is filmed and the "real", that this genre seeks to establish. This is followed by the partial conclusions of the analysis of the totality of films included in the corpus. A first systematisation of the general characteristics of the films considered allows for a definition of a new genre which we termed "documelodrama".
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Srestasathiern, Panu. "Line Based Estimation of Object Space Geometry and Camera Motion." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1345401748.
CRAWFORD, AARON. "sites for sight: Another projection for the surface of contemporary architecture." University of Cincinnati / OhioLINK, 2003. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1053376672.
Festival, Accra International Film. 1st. Accra International Film Festival: Projecting the African image. Accra, Ghana: The Ministry of Information in collaboration iwth the National Commission on Culture & the Film Guild of Ghana, 1995.
Sokolowski, Andrzej. "Parametrization of Projectile Motion." In Understanding Physics Using Mathematical Reasoning, 101–26. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-80205-9_8.
Kossovsky, Alex Ely. "Galileo’s Analysis of Projectile Motion." In The Birth of Science, 107–10. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-51744-1_22.
Kuehn, Kerry. "From Conic Sections to Projectile Motion." In Undergraduate Lecture Notes in Physics, 141–54. New York, NY: Springer New York, 2014. http://dx.doi.org/10.1007/978-1-4939-1366-4_11.
Elazar, Michael. "Projectile Motion and the Rejection of Superposition." In Honoré Fabri and the Concept of Impetus: A Bridge between Paradigms, 169–87. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-1605-6_16.
Damerow, Peter, Gideon Freudenthal, Peter McLaughlin, and Jürgen Renn. "Proofs and Paradoxes: Free Fall and Projectile Motion in Galileo’s Physics." In Exploring the Limits of Preclassical Mechanics, 135–278. New York, NY: Springer New York, 2004. http://dx.doi.org/10.1007/978-1-4757-3992-3_4.
Damerow, Peter, Gideon Freudenthal, Peter Mclaughlin, and Jürgen Renn. "Proofs and Paradoxes: Free Fall and Projectile Motion in Galileo’s Physics." In Exploring the Limits of Preclassical Mechanics, 126–268. New York, NY: Springer New York, 1992. http://dx.doi.org/10.1007/978-1-4757-3994-7_4.
Palmerino, Carla Rita. "Galileo’s Theories of Free Fall and Projectile Motion as Interpreted by Pierre Gassendi." In Boston Studies in the Philosophy of Science, 137–64. Dordrecht: Springer Netherlands, 2004. http://dx.doi.org/10.1007/978-1-4020-2455-9_8.
Magiros, Dem G. "The motion of a projectile around the earth under the influence of the earth’s gravitational atraction and a thrust." In Selected Papers of Demetrios G. Magiros, 283–90. Dordrecht: Springer Netherlands, 1985. http://dx.doi.org/10.1007/978-94-009-5368-0_22.
Dobbins, Alison C. "Motion." In Projection Design for Theatre and Live Performance, 65–71. New York: Routledge, 2021. http://dx.doi.org/10.4324/9781003137207-7.
Тези доповідей конференцій з теми "Projectile motion":
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Asrar, W., M. Baig, and S. Khan. "Chaos in WAF projectile motion." In 34th Aerospace Sciences Meeting and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1996. http://dx.doi.org/10.2514/6.1996-66.
Murphy, Charles, and William Mermagen. "Aeroelastic Motion of a Spin-stablilized Projectile." In AIAA Atmospheric Flight Mechanics Conference and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2004. http://dx.doi.org/10.2514/6.2004-5058.
Fujii, Mitsuki, Kensuke Onishi, and Teruyuki Kitabayashi. "Educational Practice Using Projectile Motion VR Application." In 2020 18th International Conference on ICT and Knowledge Engineering (ICT&KE). IEEE, 2020. http://dx.doi.org/10.1109/ictke50349.2020.9289906.
Paul, Abhijit, and Prabhat Ranjan Sahoo. "GUI based motion detection of a projectile." In 2015 International Conference on Electrical, Electronics, Signals, Communication and Optimization (EESCO). IEEE, 2015. http://dx.doi.org/10.1109/eesco.2015.7253663.
Rastegar, Jahangir, and Richard Murray. "A Review of Two Patents Relating to Novel Energy Harvesting Techniques to Provide Electrical Power On-Board Gun-Fired Projectiles." In ASME 2010 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/detc2010-28465.
This is a review of two patents relating to electrical power generation on-board gun-fired munitions. The devices harvest mechanical energy from the motion of the projectile (e.g. the axial firing acceleration), and then convert the energy from mechanical to electrical using novel mechanisms and materials such as piezoelectric elements. The devices are particularly important for several reasons. Firstly, the devices are inherently safe because the root source of the electrical energy is the motion of the projectile; therefore no electrical energy can be produced until after the projectile is fired. Second, the devices have a much longer shelf-life than competing electrical power sources such as batteries. Finally, the devices are simple, rugged, and reliable making them ideal for the harsh environment on-board gun-fired projectiles. In addition to presenting the general approach, the logical framework of the patented embodiments is presented, especially with respect to the types of motion used for harvesting and the challenges presented by the varied magnitudes of those motions in different weapon platforms.
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ZHANG, LONG, YAN ZHANG, YI DING, and PENG WANG. "The Projectile Angle Motion Pattern Analysis based on Projectile-Borne Geomagnetic Sensor Test." In 30th International Symposium on Ballistics. Lancaster, PA: DEStech Publications, Inc., 2017. http://dx.doi.org/10.12783/ballistics2017/16791.
KAYSER, LYLE, and T. BROWN. "Fin motion after projectile exit from gun tube." In Astrodynamics Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1992. http://dx.doi.org/10.2514/6.1992-4491.
Faraji, Hossein, Stephanie Veile, Samantha Hemleben, Pavel Zaytsev, Joel Wright, Hans Luchsinger, and Ross L. Hatton. "Impulse Redirection of a Tethered Projectile." In ASME 2015 Dynamic Systems and Control Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/dscc2015-9708.
The momentum of a projectile in free flight can be redirected by using a tether to create a “virtual wall” against which it bounces. The direction of this bounce can be controlled actively through braking modulation, or passively through placement of the tether anchor and the orientation of the projectile at impact. In this paper, we explore the space of motions achievable through the latter two methods. In particular, we consider the ways in which holding the tether away from center of mass at different angles can contribute to changes in speed and direction of motion after the bounce.
Звіти організацій з теми "Projectile motion":
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Murphy, Charles H., and William H. Mermagen Sr. Aero-Elastic Motion of a Spin-Stabilized Projectile. Fort Belvoir, VA: Defense Technical Information Center, March 2005. http://dx.doi.org/10.21236/ada441027.
Shokair, I. R. Projectile transverse motion and stability in electromagnetic induction launchers. Office of Scientific and Technical Information (OSTI), August 1993. http://dx.doi.org/10.2172/10189496.
Ritter, John J., and Richard A. Beyer. Primer Output and Initial Projectile Motion for 5.56- and 7.62-mm Ammunition. Fort Belvoir, VA: Defense Technical Information Center, September 2015. http://dx.doi.org/10.21236/ada622138.
Weinacht, Paul. Prediction of Projectile Performance, Stability, and Free-Flight Motion Using Computational Fluid Dynamics. Fort Belvoir, VA: Defense Technical Information Center, July 2003. http://dx.doi.org/10.21236/ada417123.
Chu, Szu H. BALLOT2 - A Computer Program to Analyze the In-Bore Motion of a Projectile Launched in a Stationary Smooth Gun Tube. Fort Belvoir, VA: Defense Technical Information Center, August 1986. http://dx.doi.org/10.21236/ada171055.
Herbert, T. Unsteady Fluid Motion in Liquid Filled Projectiles. Fort Belvoir, VA: Defense Technical Information Center, March 1998. http://dx.doi.org/10.21236/ada343142.
Soatto, Stefano, and Pietro Perona. Observability/Identifiability of Rigid Motion under Perspective Projection. Fort Belvoir, VA: Defense Technical Information Center, March 1994. http://dx.doi.org/10.21236/ada464761.
McCoy, Robert L. The Effect of Yaw Cards on the Pitching and Yawing Motion of Symmetric Projectiles. Fort Belvoir, VA: Defense Technical Information Center, May 1992. http://dx.doi.org/10.21236/ada250021.
Kanatani, Ken-Ichi. Analysis of Structure and Motion from Optical Flow. Part 1. Orthographic Projection. Revision. Fort Belvoir, VA: Defense Technical Information Center, June 1985. http://dx.doi.org/10.21236/ada171612.
Wang, M., H. Huo, L. Johnson, and D. He. Projection of Chinese motor vehicle growth, oil demand, and CO{sub 2}emissions through 2050. US: ANL, December 2006. http://dx.doi.org/10.2172/898531.
