Dissertations / Theses on the topic 'Snake'
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Beckendorf, Avery. "Snake Box." VCU Scholars Compass, 2011. http://scholarscompass.vcu.edu/etd/187.
Full textWeaver, Robert Elbert. "Chemosensory and behavioral ecology of the dipsadid snakes Contia tenuis, Diadophis punctatus, and Hypsiglena chlorophaea /." Pullman, Wash. : Washington State University, 2010. http://www.dissertations.wsu.edu/Dissertations/Spring2010/R_Weaver_030110.pdf.
Full textGraham, Robert Leslie James. "Snake venom molecules." Thesis, University of Ulster, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.398964.
Full textFinnson, Anton, and Victor Molnö. "Djupinlärning på Snake." Thesis, KTH, Skolan för teknikvetenskap (SCI), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-255828.
Full textReinforcement learning algorithms have proven to be successful at various machine learning tasks. In this paper we implement versions of deep Q-learning on the classic video game Snake. We aim to find out how this algorithm should be configured in order for it to learn to play the game as well as possible. To do this, we study how the learning performance of the algorithm depends on some of the many parameters involved, by changing one parameter at a time and recording the effects. From this we are able to set up an algorithm that learns to play the game well enough to achieve a high score of 66 points, corresponding to filling up 46\% of the playing field, after just above 5 hours of training. Further, we find that the trained algorithm can cope well with an obstacle being added to the game.
Smith, Douglas Eliot. "Geomagnetic sensitivity and orientation in eastern garter snakes (Thamnophis sirtalis) /." View online ; access limited to URI, 2002. http://0-wwwlib.umi.com.helin.uri.edu/dissertations/dlnow/3053123.
Full textNguyen, Annie Hoang. "Year of the snake." CONNECT TO THIS TITLE ONLINE, 2007. http://etd.lib.umt.edu/theses/available/etd-05312007-110308/.
Full textMckenzie, Jennifer. "INITIAL ASSESSMENT AND EFFECTS OF SNAKE FUNGAL DISEASE ON POPULATIONS OF SNAKES IN KENTUCKY." UKnowledge, 2018. https://uknowledge.uky.edu/forestry_etds/42.
Full textButenuth, Matthias. "Network snakes /." München : Beck, 2008. http://d-nb.info/990989569/04.
Full textBaldwin, Timothy Earl. "Ecology and morphological comparison between Rough Greensnakes (Opheodrys a. aestivus) and Eastern Smooth Greensnakes (Opheodrys v. vernalis) in West Virginia." Huntington, WV : [Marshall University Libraries], 2007. http://www.marshall.edu/etd/descript.asp?ref=756.
Full textTitle from document title page. Includes abstract. Includes vitae. Document formatted into pages: contains vi, 74 pages including maps. Bibliography: p.68-69.
Ovidiu, Chelcea Vlad, and Björn Ståhl. "Deep Reinforcement Learning for Snake." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-239362.
Full textSlinker, Eva Havas. "Snake River : a personal search." PDXScholar, 1990. https://pdxscholar.library.pdx.edu/open_access_etds/4138.
Full textPunzo, Paul S. "Navigating the Moral Pitfalls of the Service Industry "The Book of Snake"." ScholarWorks@UNO, 2017. http://scholarworks.uno.edu/td/2354.
Full textTranseth, Aksel Andreas. "Modelling and Control of Snake Robots." Doctoral thesis, Norwegian University of Science and Technology, Department of Engineering Cybernetics, 2008. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-2074.
Full textSnake robots have the potential of contributing vastly in areas such as rescue missions, fire-fighting and maintenance where it may either be too narrow or too dangerous for personnel to operate. This thesis reports novel results within modelling and control of snake robots as steps toward developing snake robots capable of such operations.
A survey of the various mathematical models and motion patterns for snake robots found in the published literature is presented. Both purely kinematic models and models including dynamics are investigated. More-over, different approaches to both biologically inspired locomotion and artificially generated motion patterns for snake robots are discussed.
Snakes utilize irregularities in the terrain, such as rocks and vegetation, for faster and more efficient locomotion. This motivates the development of snake robots that actively use the terrain for locomotion, i.e. obstacle aided locomotion. In order to accurately model and understand this phenomenon, this thesis presents a novel non-smooth (hybrid) mathematical model for 2D snake robots, which allows the snake robot to push against external obstacles apart from a .at ground. Subsequently, the 2D model is extended to a non-smooth 3D model. The 2D model offers an efficient platform for testing and development of planar snake robot motion patterns with obstacles, while the 3D model can be used to develop motion patterns where it is necessary to lift parts of the snake robot during locomotion. The framework of non-smooth dynamics and convex analysis is employed to be able to systematically and accurately incorporate both unilateral contact forces (from the obstacles and the ground) and spatial friction forces based on Coulomb’s law using set-valued force laws. Snake robots can easily be constructed for forward motion on a flat surface by adding passive caster wheels on the underside of the snake robot body. However, the advantage of adding wheels suffers in rougher terrains. Therefore, the models in this thesis are developed for wheel-less snake robots to aid future development of motion patterns that do not rely on passive wheels.
For numerical integration of the developed models, conventional numerical solvers can not be employed directly due to the set-valued force laws and possible instantaneous velocity changes. Therefore, we show how to implement the models for simulation with a numerical integrator called the time-stepping method. This method helps to avoid explicit changes between equations during simulation even though the system is hybrid. Both the 2D and the 3D mathematical models are verified through experiments. In particular, a back-to-back comparison between numerical simulations and experimental results is presented. The results compare very well for obstacle aided locomotion.
The problem of model-based control of the joints of a planar snake robot without wheels is also investigated. Delicate operations such as inspection and maintenance in industrial environments or performing search and rescue operations require precise control of snake robot joints. To this end, we present a controller that asymptotically stabilizes the joints of a snake robot to a desired reference trajectory. The 2D and 3D model referred to above are ideal for simulation of various snake robot motion pattern. How-ever, it is also advantageous to model the snake robot based the standard equations of motion for the dynamics of robot manipulators. This latter modelling approach is not as suited for simulation of a snake robot due to its substantial number of degrees of freedom, but a large number of control techniques are developed within this framework and these can now be employed for a snake robot. We first develop a process plant model from the standard dynamics of a robot manipulator. Then we derive a control plant model from the process plant model and develop a controller based on input-output linearization of the control plant model. The control plant model renders the controller independent of the global orientation of the snake robot as this is advantageous for the stability analysis. Asymptotic stability of the desired trajectory of the closed-loop system is shown using a formal Lyapunov-based proof. Performance of the controller is, first, tested through simulations with a smooth dynamical model and, second, with a non-smooth snake robot model with set-valued Coulomb friction.
The three main models developed in this thesis all serve important purposes. First, the 2D model is for investigating planar motion patterns by effective simulations. Second, the 3D model is for developing motion patterns that require two degrees of freedom rotational joints on the snake robot. Finally, the control plant model is employed to investigate stability and to construct a model-based controller for a planar snake robot so that its joints are accurately controlled to a desired trajectory.
Harper, George Raymond Pfennig David William. "Evolution of a snake mimicry complex." Chapel Hill, N.C. : University of North Carolina at Chapel Hill, 2006. http://dc.lib.unc.edu/u?/etd,611.
Full textTitle from electronic title page (viewed Oct. 10, 2007). "... in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the Department of Biology." Discipline: Biology; Department/School: Biology.
Rollinson, David S. "Control and Design of Snake Robots." Research Showcase @ CMU, 2014. http://repository.cmu.edu/dissertations/427.
Full textRuscelli, Francesco. "Shape-based compliance control for snake robots." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amslaurea.unibo.it/11985/.
Full textDatzmann, Gerd. "Aufbau und Charakterisierung des Hochenergie-Rasterionenmikroskops SNAKE." [S.l.] : [s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=964530775.
Full textLiljebäck, Pål. "Modelling, Development, and Control of Snake Robots." Doctoral thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for teknisk kybernetikk, 2011. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-12335.
Full textDale, Eirik Skjeggestad. "Neural Net Controller for a Snake Robot." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for datateknikk og informasjonsvitenskap, 2014. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-26757.
Full textGupta, Amit. "Lateral undulation of a snake-like robot." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/38709.
Full textIncludes bibliographical references (p. 117-121).
Snake robots have been studied by many researchers but historically more on a theoretical basis. Recently, more and more robotic snakes have been realized in hardware. This thesis presents a design process for the electrical, sensing, and mechanical systems needed to build a functional robotic snake capable of tactile and force sensing. Implementing a simple scheme which allows this capability permits the robot to laterally undulate without the use of wheels. The design methodology and implementation is detailed with schematics and a summary of results obtained from the hardware. Through manipulation of the body shape, the robot was able to move in the horizontal plane by pushing off of obstacles to create propulsive forces. It was found that lateral undulation is highly dependent on the actuator torque output and environmental friction.
by Amit Gupta.
S.M.
Anderson, Nancy L. "Thermal preferences, metabolic rate, and water flux of the Brown treesnake (Boiga irregularis) in the laboratory and on Guam /." The Ohio State University, 2002. http://wwwlib.umi.com/dissertations/fullcit/3039442.
Full textMann, Adam M. "A taxonomic investigation of the black ratsnake, Elaphe o. obsoleta (Say) [Reptilia, Squamata, Colubridae] in West Virginia using morphometric analyses." Huntington, WV : [Marshall University Libraries], 2007. http://www.marshall.edu/etd/descript.asp?ref=790.
Full textTitle from document title page. Includes abstract. Includes vitae. Document formatted into pages: contains v, 75,[19] pages including illustrations. Bibliography: p. 73-75.
Grassini, Simone. "BRAIN ACTIVITY EFFECTS OF AWARENESS FOR EVOLUTIONARILY THREATENING STIMULI INVESTIGATING THE SNAKE DECTECTION HYPOTHESIS : INVESTIGATING THE SNAKE DETECTION HYPOTHESIS." Thesis, Umeå universitet, Institutionen för psykologi, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-121986.
Full textOrmar är sannolikt ett av de bästa exemplen på ett evolutionärt livshotande stimuli då de utgjort ett av de första rovdjuren för primater och däggdjur i allmänhet. På senare år har man visat att bilder på ormar producerar specifika beteenden och elektrofysiologiska reaktioner hos människan, och ökad hjärnaktivitet i occipitalkortex jämfört med bilder på andra djur. Föreliggande studie undersökte hypotesen att responsen till ormbilder är oberoende från medvetandet. Deltagarna (n=27) ombads observera bilder på hotfulla respektive icke-hotfulla djurstimuli som presenterades snabbt och i slumpvis ordning på skärmen. Nivå av medvetande manipulerades genom att använda fyra olika betingelser av bakåt maskering. Event-relaterade potentialer (ERPs) visade att aktiviteten över occipitalkortex var betydligt mer uttalad för ormbilder jämfört med andra bilder, men bara i den icke-maskerade betingelsen.
Prosser, Melanie Renee. "Sexual selection in northern water snakes, Nerodia sipedon sipedon : examination of the mating system and correlates of male reproductive success using microsatellite DNA markers /." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/NQ66232.pdf.
Full textBlouin-Demers, Gabriel. "Thermoregulation and habitat use by black rat snakes (Elaphe obsoleta obsoleta) at the northern extreme of their distribution." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/NQ60951.pdf.
Full textWall, Michael. "The influence of foraging mode in snake evolution : lessons from a snake analogue, Burton's legless lizard (Lialis burtonis Gray, Pygopodidae)." Thesis, The University of Sydney, 2005. https://hdl.handle.net/2123/28033.
Full textMohty, Ralph. "Deadly Fangs: An Examination of the History and Future of Snake Envenomation." The University of Arizona, 2018. http://hdl.handle.net/10150/626589.
Full textZhao, Zifeng. "Metamorphoses of snake women, Melusine and Madam White." Thesis, University of British Columbia, 2015. http://hdl.handle.net/2429/54409.
Full textArts, Faculty of
Central Eastern Northern European Studies, Department of
Graduate
Ullah, Anwar [UNESP]. "Purification and structural characterization of snake venom proteins." Universidade Estadual Paulista (UNESP), 2013. http://hdl.handle.net/11449/100481.
Full textFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Um certo número de proteínas do veneno foram purificadas, caracterizadas e as suas estruturas foram determinadas para delinear as suas especialidades. (a) A LAAO de Bothrops jararacussu indicou uma maior especialidade para os resíduos hidrófobos, devido a uma substituição de Trp430por lle. O FAD ligado estava em uma conformação diferente do relatado em outros estudos. (b) O domínio rico em cisteína da metaloproteinase (MP III) de Bothrops moojeni pode adotar diferentes orientações relativas. (c) O local de distribuição de carga de serino proteinases é fundamental para determinar a especificidade da enzima. (d) A conformação tetramérica da Lys49 PLA2 de Bothrops brazili indica coexistência de dois estados diméricas. (e) A adição de uma segunda ponte dissulfeto estabiliza o loop catalítico e Trp 230 adota uma conformação diferente na ligação do substrato. Estes resultados contribuem para melhorar a nossa compreensão do modo de ação e função dessas proteínas
A number of venom proteins were purified, characterized and their structures were determined to delineate their specificities. (a) The LAAO from Bothrops jararacussu indicated a higher specifity for hydrophobic residues due to a substitution of Trp430 by lle. The bound FAD was in a diferente conformation to that reported in other studies. (b) The cysteine rich domain of the metalloproteinase (MP III) from Bothrops moojeni can adopt different relative orientations. (c) The local charge distribution of serine proteinases is instrumental in determining enzyme specificity. (d) The tetrameric conformation of the Lys49 PLA2 from Bothrops brazili indicates coexistence of two dimeric states. (e) The addition of a second disulphide bridge stabilizes the catalytic loop and Trp 230 adopts a different conformation on substrate binding. These results contribute to improve our understanding of the mode of action and function of these proteins
Saraiva, Pedro V. "Double spin resonance of electrons in snake states." Thesis, University of Bath, 2010. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.538553.
Full textUllah, Anwar. "Purification and structural characterization of snake venom proteins /." São José do Rio Preto, 2013. http://hdl.handle.net/11449/100481.
Full textBanca: Patrick Jack Spencer
Banca: Adélia Cristina Oliveira Cintra
Banca: Jose Ramon Abrego
Banca: Fátima Pereira de Souza
Resumo: Um certo número de proteínas do veneno foram purificadas, caracterizadas e as suas estruturas foram determinadas para delinear as suas especialidades. (a) A LAAO de Bothrops jararacussu indicou uma maior especialidade para os resíduos hidrófobos, devido a uma substituição de Trp430por lle. O FAD ligado estava em uma conformação diferente do relatado em outros estudos. (b) O domínio rico em cisteína da metaloproteinase (MP III) de Bothrops moojeni pode adotar diferentes orientações relativas. (c) O local de distribuição de carga de serino proteinases é fundamental para determinar a especificidade da enzima. (d) A conformação tetramérica da Lys49 PLA2 de Bothrops brazili indica coexistência de dois estados diméricas. (e) A adição de uma segunda ponte dissulfeto estabiliza o loop catalítico e Trp 230 adota uma conformação diferente na ligação do substrato. Estes resultados contribuem para melhorar a nossa compreensão do modo de ação e função dessas proteínas
Abstract: A number of venom proteins were purified, characterized and their structures were determined to delineate their specificities. (a) The LAAO from Bothrops jararacussu indicated a higher specifity for hydrophobic residues due to a substitution of Trp430 by lle. The bound FAD was in a diferente conformation to that reported in other studies. (b) The cysteine rich domain of the metalloproteinase (MP III) from Bothrops moojeni can adopt different relative orientations. (c) The local charge distribution of serine proteinases is instrumental in determining enzyme specificity. (d) The tetrameric conformation of the Lys49 PLA2 from Bothrops brazili indicates coexistence of two dimeric states. (e) The addition of a second disulphide bridge stabilizes the catalytic loop and Trp 230 adopts a different conformation on substrate binding. These results contribute to improve our understanding of the mode of action and function of these proteins
Doutor
Pinheiro, Jefferson Magalhães. "A procedural model for snake skin texture generation." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2017. http://hdl.handle.net/10183/171371.
Full textThere are thousands of snake species in the world, many with intricate and distinct skin patterns. This diversity becomes a problem for users who need to create snake skin textures to apply on 3D models, as the difficulty for creating such complex patterns is considerable. We first propose a categorization of snake skin patterns considering their visual characteristics. We then present a procedural model capable of synthesizing a wide range of texture skin patterns from snakes. The model uses simple image processing (such as synthesizing spots and stripes) as well as cellular automata and noise generators to create realistic textures for use in a modern renderer. Our results show good visual similarity with real skin found in snakes. The resulting textures can be used not only for computer graphics texturing, but also in education about snakes and their visual characteristics. We have also performed a user study to assess the usability of our tool. The score from the System Usability Scale was 85:8, suggesting a highly effective texturing tool.
Tang, Woon Khang. "Automated Coronal Loop Segmentation Using Snake-Based Algorithm." Bowling Green State University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1277139373.
Full textCaccin, Paola. "Effects of snake neurotoxins and lipids on neurons." Doctoral thesis, Università degli studi di Padova, 2009. http://hdl.handle.net/11577/3427326.
Full textIl veleno di molti serpenti contiene neurotossine ad azione presinaptica (SPAN, snake presynaptic PLA2 neurotoxin) che sono in grado di provocare blocco della neurotrasmissione e paralisi muscolare. I motivi strutturali sono molto conservati, ma la struttura quaternaria è molto variabile; si sono perciò prese in considerazione quattro tossine di diversa complessità strutturale: notexin (monomero), ?-bungarotoxin (eterodimero), taipoxin (trimero) e textilotoxin (pentamero). Queste tossine sono dotate di attività enzimatica di tipo PLA2, cioè idrolizzano il legame estereo in posizione 2 dei glicerofosfolipidi, producendo lisofosfolipidi e acidi grassi. Utilizzando miscele equimolari di questi lipidi su giunzione neuromuscolare isolata e su neuroni in coltura si è dimostrato che essi sono in grado di riprodurre gli effetti delle tossine: blocco della neurotrasmissione con alterazione della morfologia dei terminali (deplezione delle vescicole sinaptiche, rigonfiamento, alterazione dei mitocondri) e formazione di rigonfiamenti (“bulges”) sui neuriti, caratterizzati da accumulo di proteine specifiche delle vescicole sinaptiche. Questi dati hanno portato a interpretare il meccanismo d’azione delle tossine come uno sbilanciamento tra eso ed endocitosi, dovuto alle caratteristiche strutturali dei lipidi che vengono prodotti: la lisofosfatidilcolina (lisoPC) ha forma di cono invertito e rimane confinata nel foglietto esterno della membrana, gli acidi grassi hanno forma a cono, ma si ripartiscono velocemente su entrambe i foglietti. Questa alterazione della composizione lipidica della membrana plasmatica ne provoca una deformazione che rende più facile il processo di fusione con le vescicole sinaptiche, cioè facilita la transizione tra intermedio di emifusione e poro aperto; per le stesse ragioni invece inibisce l’endocitosi, necessaria per il recupero delle vescicole stesse e il mantenimento della funzionalità della sinapsi. Analoghi risultati di blocco della neurotrasmissione sono stati ottenuti testando lisofosfolipidi con diverse teste polari; in particolare, lisolipidi dotati di carica negativa, in presenza di alte concentrazioni di magnesio, sono in grado di provocare un andamento trifasico della paralisi (iniziale depressione, facilitazione, diminuzione progressiva della contrazione muscolare) ritenuto tipico delle SPANs. Il fenomeno è reversibile mediante lavaggio con albumina, capace di complessare i lipidi e riequilibrare la situazione. Le SPANs e i loro prodotti lipidici sono stati testati anche sulla giunzione neuromuscolare di Drosophila melanogaster: le tossine sono risultate inattive in questo modello, suggerendo la mancanza di recettori specifici, necessari alla loro azione. La miscela di lisoPC e acido oleico provoca invece un iniziale aumento del potenziale post-sinaptico eccitatorio, seguito dal blocco della neurotrasmissione, e un rigonfiamento dei bottoni sinaptici. Analogamente a quanto osservato sulla giunzione neuromuscolare di topo, il componente attivo è la lisoPC e il suo effetto sulla fusione delle vescicole sinaptiche sembra essere di carattere generale. Anche animali meno evoluti dei serpenti, come alcuni insetti ematofagi, contengono nella loro saliva concentrazioni significative di lisoPC, sufficienti a provocare nei modelli sperimentali effetti analoghi a quelli osservati con i lipidi sintetici. E’ possibile che questi lipidi rappresentino una forma molto semplice di veleno ottenuto da fosfolipasi digestive, da cui si sono in seguito evolute le neurotossine. L’effetto sulla fusione delle vescicole non è sufficiente a spiegare l’estensiva deplezione che si osserva dopo l’intossicazione. La prolungata produzione di lisolipidi e acidi grassi provoca un’alterazione della permeabilità della membrana allo ione calcio, che entra nella cellula principalmente dal mezzo esterno. Questo comporta una massiccia fusione delle vescicole sinaptiche, che coinvolge anche il pool di riserva, e alterazioni del metabolismo cellulare, soprattutto a carico dei mitocondri. Tossine coniugate con fluorofori sono visibili all’interno dei neuroni dopo tempi brevi di intossicazione e colocalizzano con i mitocondri. Su preparazioni di mitocondri isolati sono in grado di promuovere l’apertura del poro di transizione della permeabilità mitocondriale con un’efficienza proporzionale alla loro attività fosfolipasica; analoghi risultati si sono ottenuti con miscele di lisoPC e acidi grassi. Blocco reversibile della neurotrasmissione, formazione di bulges nei neuroni e aumento dei livelli intracellulari di calcio sono prodotti, con cinetiche simili a quelle della lisoPC, anche da altre molecole anfipatiche di diversa struttura chimica, ma aventi una forma complessiva di cono invertito. Tra queste sono state testate miltefosina e perifosina, usate in terapia come agenti anti-tumorali, e il lisolipide derivato dal PAF (Platelet Activated Factor). La neurotossicità delle fosfolipasi di serpente deriva quindi da una elevata specificità e localizzazione dell’attività enzimatica; accanto a ciò è da considerare che la loro azione si esplica su un meccanismo che ha carattere più generale, cioè il ruolo dei lipidi nei processi di fusione delle membrane biologiche.
Pandey, Deb Prasad, Pandey Gita Subedi, Kamal Devkota, and Matt Goode. "Public perceptions of snakes and snakebite management: implications for conservation and human health in southern Nepal." BIOMED CENTRAL LTD, 2016. http://hdl.handle.net/10150/617404.
Full textKurtulmus, Ergin. "Locomotion And Control Of A Modular Snake Like Robot." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612533/index.pdf.
Full textCall, Anson Jay. "Dynamic modeling and simulation of a snake-like robot." Thesis, Georgia Institute of Technology, 1989. http://hdl.handle.net/1853/19523.
Full textGuo, Chun Teng. "Molecular analyses of the bioactive components in snake venom." Thesis, University of Ulster, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.494354.
Full textJonsson, Tobias. "Snake Grid och andra objektanpassade projektioner för svensk infrastruktur." Thesis, KTH, Geodesi och satellitpositionering, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-168092.
Full textThis thesis investigates the applicability of tailored map projections for the design, construction and maintenance of long objects, such as roads and railways, in Swedish infrastructure. Special emphasis is on the Snake Grid projection, developed by University College London in collaboration with Network Rail, the organization responsible for construction and maintenance of the railway network in Great Britain. The ongoing Swedish investments in expansion and upgrades of the country’s railway network poses new challenges for surveyors, as the constructions are becoming increasingly complex and tolerances more narrow. Track design is usually carried out with software with the built-in assumption that the construction will be made in a three-dimensional space with coordinate axes pointing to the north and the east, and with a vertical axis perpendicular to those. Problems arise when this flat-Earth assumption meets the reality of a curved surface and hilly terrain. The classical solution of this dilemma is to work with map projections, in order to make a local or regional approximation of a flat Earth for mapping and design purposes. The size of the projection zone and the local topography decides the maximum distortions that will be in the map. For purely geodetic purposes, such as topographic surveying or establishment of control point networks, corrections can be applied to the measurements to fit them to the projected map, but when it comes to construction design, where dimensions should be correct and one meter in the blueprint should correspond to one meter in reality, things get more complicated. For some constructions, the scale distortions on the outskirts of the official projection zones for the Swedish national grid SWEREF 99 are too large. One way to deal with that is to instead tailor a map projection, specific for that construction object, which will minimize scale distortions along the object. In Great Britain, Network Rail has adopted this approach to managing their railway network, and together with University College London developed a special kind of map projection for this purpose, known as Snake Grid. The principle of Snake grid is to force the scale to unity along a sinuous trend line, following the track geometry, and in the process adjust for scale distortions due to both projection and height above the ellipsoid. Each main line has been assigned its own horizontal coordinate system in that way, minimizing scale distortions in proximity to the tracks to a negligible level. As a result, construction designers and surveyors can work from a flat Earth assumption. This thesis deals with the questions whether the benefits of using Snake Grid are significant compared to tailoring other map projections, like Transversal Mercator, Oblique Mercator or Lambert Conformal Conic, and whether there are any large differences in methods or organization between Sweden and the UK that might influence the suitability of this approach and whether the pros outweigh the cons such as increased administration and risks in communication. To give Swedish readers a more detailed introduction to the concept, the theoretical description of Snake Grid is relatively comprehensive in this thesis. It also contains short descriptions of a small selection of alternative methods. After that, a comparative analysis of the methods is made by way of calculation, testing a few infrastructure projects to see which strengths and weaknesses the different map projections possess, and what magnitude of scale distortions can be expected. The examined projects are the West Coast and East Coast Main Lines, the Øresund bridge, the Stockholm Bypass, the Gothenburg-Borås railway, the Eastern link railway (Ostlänken) and the railway between Sundsvall and Trondheim. The results of the calculations indicate that, in most cases, traditional map projections such as Transversal or Oblique Mercator can be tailored to a project, with results comparable to reported results for the Snake Grid method. The tailoring, however, requires specialist competence that is hard to come by, and in the practical daily application it will also put some requirements on the competence of the end user. One of the advantages of Snake Grid is that it is a package solution with user support available. The thesis also describes the responsibilities of Network Rail, and which government bodies are involved in the maintenance of the British railway network. The existing geodetic infrastructure in Great Britain, in the form of reference systems, and control point networks is also described. An evaluation has also been made, whether tailored map projections can be used in accordance with current Swedish rules and regulations for road and railway construction. The purpose of these investigations has been to determine if there are any decisive differences between Sweden and the UK with regard to the regulatory circumstances surrounding the use of object specific map projections. The result of this comparison is that there are no substantial differences that would make the use of Snake Grid or other object specific map projections less suitable in Sweden. The usage of object specific projections in railway projects would however require exemptions from or changes to the current Swedish railway regulations.
Savage, Christopher Tyra. "Alternative Epigraphic Interpretations of the Maya Snake Emblem Glyph." Master's thesis, University of Central Florida, 2007. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/2093.
Full textM.A.
Department of Liberal and Interdisciplinary Studies
Graduate Studies;
Liberal Studies MA
Ward, Robert John. "Status and conservation of the grass snake in Jersey." Thesis, University of Kent, 2017. https://kar.kent.ac.uk/65819/.
Full textLin, Eugene S. "A fuzzy global minimum snake model for contour detection /." Thesis, Connect to this title online; UW restricted, 1999. http://hdl.handle.net/1773/6120.
Full textAlreemi, Roaa. "Chemical and Biological Studies of Hibbertia Scandens (Snake Vine)." Thesis, University of Sydney, 2020. https://hdl.handle.net/2123/23515.
Full textHolm, Peter. "Phylogenetic Biology of the Burrowing Snake Tribe Sonorini (Colubridae)." Diss., The University of Arizona, 2008. http://hdl.handle.net/10150/196086.
Full textPrior, Kent A. "Conservation biology of black rat snakes ecological, demographic, and genetic approaches /." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape16/PQDD_0001/NQ26863.pdf.
Full textMoore, Robin D. "The impact of introduced predators on the Mallorcan midwife toad Alytes muletensis." Thesis, University of Kent, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.269109.
Full textKamiguti, Aura S. "Effects of jararhagin, a haemorrhagic metalloproteinase from Bothrops jararaca venom, on platelet and plasma proteins involved in haemostasis." Thesis, University of Liverpool, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.261911.
Full textLawrence, Sidra Meredith. "Killing My Own Snake: Fieldwork, Gyil, and Processes of Learning." Connect to this title online, 2006. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=bgsu1151067357.
Full textGarcía, Estébanez Jesús. "GPS-IMU Integration for a Snake Robot with Active Wheels." Thesis, Norwegian University of Science and Technology, Department of Engineering Cybernetics, 2009. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-9107.
Full textA snake robot will be defined herein as any multilink robot for whose shape and motion capabilities are reminiscent of a snake like PiKo [1]. PiKo is a five links snake robot with active wheels designed by SINTEF in collaboration with the Norwegian University of Science and Technology (NTNU). Researchers have been greatly interested in the development of robots like PiKo because of its shape versatility and motion capacity in difficult terrains. These skills and properties are useful for rescue teams working in earthquakes, pipe inspection operations and other utilities where access and movement in the terrain are typically difficult. When a working team decides to develop a snake robot, an important point to consider is the development of an efficient navigation system that reaches an accurate position of the robot. Technically speaking, it is prudent to design at the same time a state observer that gives us at least the real time position and velocity information of the robot body to be controlled. The relevance of this information is derived from every control action applied to the robot will require some information about the situation of the robot over time. The controller will need feedback about the robot dynamics and the effect that the control actions have caused. Typically this information has three sources: the information that comes from external sensors, that from internal sensors that transmitting to the control place the measurements from the sensors in the robot body and estimated data from a physical model. All of these feedback sources have some advantages and disadvantages. Implementing an external observer, with external sensors, will not cause space problem with sensors location in the robot body, but when the robot is working inside a pipe, underground or in another hard environment where the optical, magnetic or radio frequency contact is difficult or impossible, the information reception from an external observer is too difficult and expensive or simply impossible. Locating internal sensors in the body of the robot may solve has the problem with the measurements reception, but still pose some difficulties which must be considered by the designer. Many times space becomes a problem when locating some sensors inside the robot body due to size and weight constraints within the robot body. Basing the navigation system instead on a physical model that simulates the robot motion invites the possibility of error due to simplifications taken during the mathematical and physical development. It is impossible to develop a perfect physical model since all the variables, forces, and parameters that depend on the nature characteristics usually are random process and we can just raise a useful factor estimating the average of these effects in our concrete situation. In this thesis a navigation system with a GPS (Global Positioning System) and IMU (Inertial Measurement Unit) fusion was achieved. This navigation system will be work as long the GPS signal is available. The application of the fusion technique further reduces one order the potential errors inherent in using only the GPS navigation system. When the robot will encounter locations where the GPS signal is impossible, this thesis will present a set of tools that not being a universal solution, it will be a set of mathematical tools that depending on the case could give us an accurate navigation system. During the time the GPS signal reception is impossible, this thesis presents the development and implementation of a physical model for a snake robot with active wheels which simulates the snake robot running behavior and studies the possibility to use the trajectory estimated by the model for reaching an accurate navigation system.
Thomaz, Diego Venâncio [UNESP]. "Extração de contornos de telhados usando princípios de Snake Balloon." Universidade Estadual Paulista (UNESP), 2012. http://hdl.handle.net/11449/94316.
Full textCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Este trabalho propõe um método de extração de contornos de telhados convexos de edifícios a partir de dados de um Modelo Digital de Superfície normalizado (MDSn). A modelagem do contorno se dará através do modelo de snake balloon, onde um funcional de energia dependente de muitas variáveis será otimizado através do algoritmo de Programação Dinâmica (PD). O MDSn se mostra atrativo na aplicação de extração de contornos de telhados de edifícios, pois permite separar as regiões de edifícios da maioria das outras regiões, principalmente as mais baixas. O modelo de snake balloon pode ser interpretado como uma curva poligonal fechada que se deforma sob a ação de forças internas e externas agindo sobre o modelo. O método proposto neste trabalho utiliza algumas características apresentadas pelo MDSn para desenvolver uma estratégia de solução do problema de otimização. Uma dessas características está ligada ao fato de que os contornos de telhados de edifícios no MDSn estão associados com grandes desníveis e os pontos representativos do contorno apresentam-se sobre o edifício. Assim, para dar início ao processo de extração, bastaria colocar um único ponto semente sobre o telhado. Tal ponto se expandiria, tornando-se uma curva poligonal fechada. Até que a curva encontre o limite do telhado são necessárias várias etapas...
This work proposes a method for building convex-roof contours extraction from data of a normalized Digital Surface Model (nDSM). The contour modeling will be made by the snake balloon model, where an energy functional depending on many variables will be optimized through the Dynamic Programming algorithm (DP). The nDSM proves to be attractive in the application of building roof contour extraction, as it allows separating buildings regions from mostly other regions, especially the lowest ones. The snake balloon model can be interpreted as an polygonal closed curve that deforms under the action of internal and external forces acting on the model. The method proposed in this work uses some of the features presented by nDSM in order to develop a strategy to solve an optimization problem. One of these characteristics is related to the fact that building roof contours in a nDSM are associated with large elevation differences and representative points of the contour are presented over the building. So, to start the extraction process, it would be enough to place a single seed point on the roof. The point would expand and become a polygonal closed curve. Until the curve find the edge of the roof, several expansion stages are required... (Complete abstract click electronic access below)