Se connecter

Bibliographies thématiques / STfR / Thèses

Thèses sur le sujet « STfR »

Pour voir les autres types de publications sur ce sujet consultez le lien suivant : STfR.

Auteur : Grafiati

Publié le 11 mars 2023

Créez une référence correcte selon les styles APA, MLA, Chicago, Harvard et plusieurs autres

Choisissez une source :

Consultez les 50 meilleures thèses pour votre recherche sur le sujet « STfR ».

À côté de chaque source dans la liste de références il y a un bouton « Ajouter à la bibliographie ». Cliquez sur ce bouton, et nous générerons automatiquement la référence bibliographique pour la source choisie selon votre style de citation préféré : APA, MLA, Harvard, Vancouver, Chicago, etc.

Vous pouvez aussi télécharger le texte intégral de la publication scolaire au format pdf et consulter son résumé en ligne lorsque ces informations sont inclues dans les métadonnées.

Parcourez les thèses sur diverses disciplines et organisez correctement votre bibliographie.

1

Abellán, Sánchez María Rosario. « Estudio en poblaciones seleccionadas de la fiabilidad de nuevos protocolos de detección de consumo de hormonas recombinantes (hgH y EPO) ». Doctoral thesis, Universitat Pompeu Fabra, 2006. http://hdl.handle.net/10803/7103.

Texte intégral

Résumé :

Las hormonas recombinantes eritropoyetina (EPO) y hormona de crecimiento (GH), prácticamente iguales a las endógenas y de corta vida media en circulación, son de difícil detección directa en el control antidopaje.
Se determinaron los valores poblacionales de los biomarcadores indirectos EPO, receptor soluble de la transferrina, insulin-like growth factor-I (IGF-I) y procolágeno tipo III péptido (P-III-P), en poblaciones seleccionadas de deportistas, y el efecto del ejercicio y los distintos tipos de entrenamiento sobre su concentración sérica.
La comparación de resultados obtenidos mediante distintos ensayos demostró la necesidad de una validación exhaustiva previa a su utilización. A excepción del P-III-P, los biomarcadores séricos propuestos para la detección de rhEPO y rhGH no se encuentran directamente afectados por el nivel atlético, el ejercicio o la distinta carga de entrenamiento realizada a lo largo de la temporada deportiva. La edad es la principal influencia sobre las concentraciones séricas de IGF-I y P-III-P.
Direct detection of recombinant peptidic hormones erythropoietin (EPO) and growth hormone (GH), very similar to endogen molecules and with a short half life in blood, is difficult in antidoping control.
The main objective of this work is to determine indirect biomarkers' values of EPO, soluble transferrin receptor, insulin-like growth factor-I (IGF-I) and procollagen type III peptide (P-III-P), in selected populations of athletes, and the effect of exercise and different types of training on their concentration in serum.
The comparison of results obtained by the different assays showed the need of extensive validation of the analytical techniques before their use in the antidoping field. Excepting P-III-P, proposed biomarkers for the detection of rhEPO and rhGH abuse are not directly influenced by the athletic level, exercise or different training workload along the sport season. Age is the main factor affecting IGF-I and P-III-P concentrations in serum.

Styles APA, Harvard, Vancouver, ISO, etc.

2

Tavenner, Carson. « Toward an understanding of People's Liberation Army information warfare doctrine / ». Wright-Patterson AFB, OH : Air Force Institute of Technology, 2000. http://stinet.dtic.mil/str/tr4%5Ffields.html.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

3

Varble, Derek. « The Atlantic partnership and Middle Eastern strategy in the early Cold War ». Thesis, Search "ADA381603" in "Accession number" field, 2000. http://stinet.dtic.mil/str/tr4%5Ffields.html.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

4

Craig, Adriane B. « The role of public affairs in the military-media relationship / ». Search "ADA379993" in "Accession number" field, 2000. http://stinet.dtic.mil/str/tr4%5Ffields.html.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

5

Pilkey, Sunchlar M. R. « The politics of internal security : relations between civilians, the military, and police / ». Search "ADA381839" in "Accession number" field, 2000. http://stinet.dtic.mil/str/tr4%5Ffields.html.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

6

Rose, Donald Gregory. « Peace operations and counterinsurgency : the US military and change / ». Search "ADA381155" in "Accession number" field, 2000. http://stinet.dtic.mil/str/tr4%5Ffields.html.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

7

Whiteman, Neil S. « Charging ahead : has the government purchase card exceeded its limit ? / ». Search "ADA383045" in "Accession number" field, 2000. http://stinet.dtic.mil/str/tr4%5Ffields.html.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

8

Montgomery, Jeffrey Michael. « Educating citizens : George Washington's proposals for national education / ». Required Adobe Acrobat Reader, 2000. http://stinet.dtic.mil/str/tr4%5Ffields.html.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

9

Volkland, Wendy. « How clean is safe ? / ». (Requires Adobe Acrobat Reader), 2000. http://stinet.dtic.mil/str/tr4%5Ffields.html.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

10

Wager, James B. « Towards the attenuation of hardship : is there room for combatant immunity in internal armed conflicts ? / ». (Requires Adobe Acrobat Reader), 2000. http://stinet.dtic.mil/str/tr4%5Ffields.html.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

11

Hoverstein, Michael R. « The law governing aerospace warfare in the twenty-first century / ». (Requires Adobe Acrobat Reader), 2000. http://stinet.dtic.mil/str/tr4%5Ffields.html.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

12

Copley, G. Bruce. « Epidemiologic risk factors for suicide and attempted suicide by the U.S. Air Force : using administrative data systems and multiple cause of death information to improve prevention policy / ». (Requires Adobe Acrobat Reader), 2000. http://stinet.dtic.mil/str/tr4%5Ffields.html.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

13

Heppelmann, Andrew R. « The implication of emerging security threats on civil-military relations / ». (Requires Adobe Acrobat Reader), 2001. http://stinet.dtic.mil/str/tr4%5Ffields.html.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

14

Morton, Michael Charles. « Engaging Iran : a study of modifying the United States of America's foreign policy towards the Islamic Republic of Iran / ». (Requires Adobe Acrobat Reader), 2001. http://stinet.dtic.mil/str/tr4%5Ffields.html.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

15

DuMond, John D. « Changes in the security environment of Europe and their implications for Czech military force structure / ». (Requires Adobe Acrobat Reader), 2001. http://stinet.dtic.mil/str/tr4%5Ffields.html.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

16

Bachler, Donald R. « The revolution in military affairs : impact on the U.S. Army personnel system / ». (Requires Adobe Acrobat Reader), 2001. http://stinet.dtic.mil/str/tr4%5Ffields.html.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

17

Lyles, Ian Bradley Bob. « The rise and fall of the DINA in Chile ; 1974-1977 and the social, economic, and political causes of bureaucratic-authoritarianism ; Argentina, Brazil, and Venezuela / ». (Requires Adobe Acrobat Reader), 2001. http://stinet.dtic.mil/str/tr4%5Ffields.html.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

18

Sullivan, Annata Ray. « Military couples' experiences with natural family planning / ». (Requires Adobe Acrobat Reader), 2001. http://stinet.dtic.mil/str/tr4%5Ffields.html.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

19

Romero, Jorge H. « Cyberespionage 2010 : is the current status of espionage under international law applicable in cyberspace ? / ». (Requires Adobe Acrobat Reader), 2001. http://stinet.dtic.mil/str/tr4%5Ffields.html.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

20

Moulton, John B. « Fatal debilitation through flawed crisis management : UNSCOM : 1997-1998 ». Thesis, (Requires Adobe Acrobat Reader), 2001. http://stinet.dtic.mil/str/tr4%5Ffields.html.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

21

Gallo, Marco <1987&gt. « The World's 4-Star and 5-Star Airlines ». Master's Degree Thesis, Università Ca' Foscari Venezia, 2012. http://hdl.handle.net/10579/1558.

Texte intégral

Résumé :

Le strategie adottate dalle compagnie aeree più esclusive e prestigiose al mondo come Emirates, Qatar Airways e Singapore Airlines hanno l'intento di combinare razionalmente le competenze acquisite e i servizi offerti, ottenendo allo stesso tempo migliore produttività e maggiore redditività. Queste aziende hanno intrapreso percorsi di integrazione diagonale intervenendo efficacemente nelle aree più vantaggiose del processo di creazione del valore e realizzando un paniere complesso di beni che mira a massimizzare la soddisfazione del cliente. Vengono instaurate alleanze strategiche con soggetti economici appartenenti ad altri ambiti operativi che non presentano quindi cicli produttivi simili, ma attività connesse trasversalmente che permettono di sviluppare importanti sinergie e servizi turistici di primissima qualità. I vettori a 4 e 5 stelle hanno trasformato il viaggio in aereo in un'esperienza unica ed indimenticabile, oltre a perfezionare l'intrattenimento on board hanno dato vita a suddivisioni interne che si occupano di destination management. Il modello di business da esse definito comporta una serie di benefici derivanti dalla cooperazione tra le varie attività di gestione, in modo tale che ciascuna di esse generi profitti da reinvestire. Ogni singolo prodotto offerto al cliente viene sottoposto a rigorossissimi programmi di selezione ed è proprio per questo motivo che ogni anno milioni e milioni di viaggiatori volano con Emirates, Qatar Airways e Singapore Airlines.

Styles APA, Harvard, Vancouver, ISO, etc.

22

Thornton, Bernard Christopher Buchanan. « Double Star ». AUT University, 2010. http://hdl.handle.net/10292/958.

Texte intégral

Résumé :

The work is situated in a literary and theoretical context by working with the concepts of authenticity and realism, and within that the story/world distinction. The literary context is examined in terms of realism, naturalism, and the novel of character or psychological novel. The associated research is then discussed. Finally, the novel’s societal context is analysed in terms of some prevailing philosophical views and the existing socio-political structure.

Styles APA, Harvard, Vancouver, ISO, etc.

23

Worley, Christiana. « Rising Star ». Thesis, St Andrews, 2007. http://hdl.handle.net/10023/321.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

24

Holic, Nathan Andrew. « Frat Star ». Master's thesis, University of Central Florida, 2007. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3140.

Texte intégral

Résumé :

This thesis, a social novel in the tradition of Tom Wolfe's The Bonfire of the Vanities and Michael Chabon's The Amazing Adventures of Kavalier and Clay, is all at once an attentive first-person study of a twenty-something man close to his cracking point in his first post-college job, a detailed exposé of national fraternities, and the sweeping panoramic view of an entire generation of over-programmed college students searching for direction. Frat Star follows a fragile college graduate named Charles Washington, who takes a position as an "Educational Consultant" with a national fraternity in his first semester after graduation. For sixteen straight weeks, he drives across the country, from college to college and fraternity house to fraternity house, meeting with alumni and students, and living on frat house couches and in seedy off-exit hotels. As he travels, the pressure mounts for Charles to convince his family and friends back home that this is a "Real Job" and that his work actually matters to the business world, but at each new fraternity house he visits, his yearning for the old college atmosphere grows--the beer, the parties, the girls!--threatening to send him into a frightening tailspin. How can he be a professional when the temptations of youth still seem so attractive? And before Charles can sort out what is happening in his own life, he finds himself stuck in a vicious tug-of-war between students, alumni, administrators, and the national fraternity, when he must deal with one particularly abrasive undergraduate fraternity and the aftermath of its disastrous decisions. Spanning thousands of miles, from Florida to California, from Illinois to New Mexico, this thesis takes us inside fraternity houses, into their attics and their basements, behind the scenes of their rituals and ceremonies, inside their parties, inside their heads, giving us a view not only of the power of the national fraternity, but the disconnect between alumnus and student, between Baby Boomer and Generation X and Millennial. Incorporating research as varied as the generational studies of Howe and Strauss, and Alexandra Robbins' psychological study of the "Quarterlife Crisis," Frat Star stretches across the country, stretches across genre, stretches from text to illustration, but is ultimately the human story of a young man's longing for morality, independence, and purpose in a world he simply has not been prepared to understand.
M.F.A.
Department of English
Arts and Humanities
Creative Writing MFA

Styles APA, Harvard, Vancouver, ISO, etc.

25

Stovicek, Amanda. « Star Factory ». Kent State University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=kent1492774654144783.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

26

Lanshe, Madeline. « Star Hearts ». University of Akron / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=akron1607097296795997.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

27

Miller, Shanda Schrae. « Southern star ». [Johnson City, Tenn. : East Tennessee State University], 2003. http://etd-submit.etsu.edu/etd/theses/available/etd-0715103-222857/unrestricted/MillerS080703f.pdf.

Texte intégral

Résumé :

Thesis (M.A.)--East Tennessee State University, 2003.
Title from electronic submission form. ETSU ETD database URN: etd-0715103-222857. Includes bibliographical references. Also available via Internet at the UMI web site.

Styles APA, Harvard, Vancouver, ISO, etc.

28

Hu, Yuan. « Friction-Stir Riveting : Mechanical Testing of Friction-Stir Riveting ». University of Toledo / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1430393133.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

29

Polley, Sarah Jayne. « Embracing star couples : contextualising star images in Hollywood's studio era ». Thesis, University of Kent, 2017. https://kar.kent.ac.uk/65201/.

Texte intégral

Résumé :

Much star studies theory, following key theorist Richard Dyer (1998/1979; 1986), continues a focus on 'the star' in isolation. This thesis, however, places stars within the context of other stars. Specifically, I analyse three popular star couples from Hollywood's Studio Era. Star couples played an important part in Hollywood production and reception, with many films employing a male and a female star involved in a romantic plot. My case studies of Charles Farrell and Janet Gaynor (partnered in films from 1927-1934), William Powell and Myrna Loy (1934-1947), and Walter Pidgeon and Greer Garson (1941-1953) focus on their representation in fan magazines. Fan magazines are rich and complex sites of star and audience interaction, with these publications misleadingly implying that they provide access to the 'real' star. In fact, as Dyer has commented, we are only ever offered a carefully constructed media text - a 'star image' - comprised of promotion, publicity, films, and criticism and commentary. Fan magazines have recently become increasingly available to researchers via digital platforms, making my advancing of a rigorous, yet flexible, methodology especially relevant. Expanding on recent work on tropes in fan magazine coverage, I analyse themes occurring in these stars' screen and star images. Comparison within and between these star couples affords insights into what found favour with audiences at different times, especially in relation to romance. The thesis also sheds light on the intricate ways Hollywood negotiated its presentation of screen and star images within the framework of myriad stars.

Styles APA, Harvard, Vancouver, ISO, etc.

30

Chan, Ying-kit. « Strange star cooling ». Click to view the E-thesis via HKUTO, 2005. http://sunzi.lib.hku.hk/hkuto/record/B3138254X.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

31

Andersson, Niklas, et Marcus Jönsson. « Global Star V ». Thesis, Högskolan i Halmstad, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-16131.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

32

Hoffman, Kelsey Llyn. « Neutron star metallurgy ». Thesis, University of British Columbia, 2011. http://hdl.handle.net/2429/38311.

Texte intégral

Résumé :

The crust of a neutron star plays an important role in the emission observed from it. The thermal emission generated in the core of the neutron star passes through the crust, thus it is important to know what is in the crust in order to understand how the emission is shaped and altered. The crust itself may be responsible for the observations of glitches from neutron stars and also as a source of gravitational waves. This thesis is two-fold. The first goal is to calculate the composition of the neutron star crust of a non-accreting neutron star. The second is to use the calculated crustal compositions in molecular dynamics simulations in order to determine the shear modulus and breaking strain of the crustal material. The composition of the crust is found to be dependent on how the neutron star cooled. Nuclear reactions within the crust are quenched as the star cools. The composition of the crust, envelope, and atmosphere are calculated after the nuclear reactions are quenched. With the settling timescales of the various isotopes in the crust, some of these isotopes are able to float up to the neutron star surface and form the atmosphere. Three different cooling methods were used in these calculations – modified Urca cooling, a thick crust and a thin crust – each produces different atmospheric and crustal compositions. The calculated crustal abundances are then used as initial conditions in molecular dynamics simulations. A shear force is introduced by deforming the simulation box. The shear modulus and breaking strain are calculated for the three different crustal compositions as well as for perfect pure face-centered cubic (FCC) and body-centered cubic (BCC) systems. The upper limit, from the perfect crystal lattice structure, on the breaking strain is found to ~0.11 − 0.12 and the shear modulus is found to be 6.5 × 10³º dyne/cm². These properties predict glitch amplitudes of ∆Ω/Ω∼10⁻³. The gravitational wave strain amplitudes for PSR J2124- 3358 are also predicted to be greater than the observed upper limits. This indicates that the neutron star crust is not a perfect BCC lattice which deformed to 10% of the maximum.

Styles APA, Harvard, Vancouver, ISO, etc.

33

Booth, H. J. « Guide star lasers ». Thesis, University of Oxford, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.300872.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

34

Chan, Ying-kit, et 陳英傑. « Strange star cooling ». Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2005. http://hub.hku.hk/bib/B3138254X.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

35

Cahen, Benjamin. « STAR réprésentations induites ». Metz, 1992. http://docnum.univ-lorraine.fr/public/UPV-M/Theses/1992/Cahen.Benjamin.SMZ9225.pdf.

Texte intégral

Résumé :

Ce travail est consacré à la description de certaines séries de représentations induites d'un groupe de Lie en termes de déformations d'algèbres de fonctions sur les orbites coadjointes associées, selon les prescriptions de F. Bayen, M. Flato, C. Fronsdal, A. Lichnerowicz et D. Sternheimer. L'outil utilisé est la construction d'un calcul symbolique (transformation de Weyl généralisée) au-dessus des orbites coadjointes considérées, laquelle construction a été effectuée ici dans deux cas importants, celui des orbites coadjointes d'un groupe de Lie semi simple associées à sa série principale unitaire et celui des orbites coadjointes dites massives d'un groupe de Poincaré généralisé (produit semi direct d'un groupe semi simple par un groupe vectoriel). Dans chacun de ces cas, il a été défini des STAR représentations (au sens de C. Fronsdal) associées aux représentations considérées
This workis devoted to the description of some induced representation series of a Lie group in terms of deformations on some algebras of functions on the associated coadjoint orbits, according to F. Bayen, M. Flato, C. Fronsdal, A. Lichnerowicz and D. Sternheimer. The way used is the construction of a symbolic calculous (generalized Weyl transform) on coadjoint orbits and this construction has been realized here in two important cases : the case of the coadjoint orbits of a semi simple Lie group associated to its unitary principal series and the case of massive coadjoint orbits of a generalized Poincaré group (semi direct product of a semi simple Lie group by a vector space). In these two cases, we have defined the star representations (in the Fronsdal's sense associated to the considered representations)

Styles APA, Harvard, Vancouver, ISO, etc.

36

Conte, Carolina Siqueira. « STAR-CROSSED LOVERS ». Ohio University / OhioLINK, 2001. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou992357892.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

37

Khan, Rubab. « Massive Star Geriatrics ». The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1404796563.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

38

Henderson, Ryan Lynn. « Magnolia Star Route ». Master's thesis, Mississippi State : Mississippi State University, 2007. http://library.msstate.edu/etd/show.asp?etd=etd-04092007-130126.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

39

Kraus, Adam L. Brown Michael E. Hillenbrand Lynne A. « Multiple star formation ». Diss., Pasadena, Calif. : California Institute of Technology, 2010. http://resolver.caltech.edu/CaltechETD:etd-08252009-233632.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

40

CAHEN, BENJAMIN ARNAL DIDIER. « STAR REPRESENTATIONS INDUITES / ». [S.l.] : [s.n.], 1992. ftp://ftp.scd.univ-metz.fr/pub/Theses/1992/Cahen.Benjamin.SMZ9225.pdf.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

41

Fryer, Christopher Lee 1969. « Neutron star populations ». Diss., The University of Arizona, 1996. http://hdl.handle.net/10150/298809.

Texte intégral

Résumé :

This dissertation clarifies two aspects of neutron-star formation and evolution: the formation of neutron stars through the accretion-induced collapse of white dwarfs and the common envelope evolution of neutron stars. In both cases, we utilize a 1-D lagrangean and 2-D SPH hydrodynamics codes equipped with a broad range of physics including neutrino emission, absorption, and transport, general relativity and dense equations of state. These results are then applied to a Monte-Carlo population synthesis code to study the effects of kicks placed upon neutron stars near the time of their formation. By comparing these results with the current observational data, we find that a bimodal kick distribution of neutron-star kicks is required.

Styles APA, Harvard, Vancouver, ISO, etc.

42

Sedin, John. « Analys av varför bilar styr framnär båtar och flygplan styr bak ». Thesis, KTH, Skolan för teknikvetenskap (SCI), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-153634.

Texte intégral

Résumé :

Bakhjulsstyrning av fordon är en möjlig konfiguration som lite glömts bort inom fordonstekniken. Tidigare arbeten inom ämnet bakhjulsstyrning är väldigt detaljerade och snäva i sin analys. I detta arbete vill författaren visa en bakgrund till hur olika farkoster styrs samt analys av detta. Syftet med arbetet är att utifrån litteratursökning och intervjuer kunna besvara vilken inverkan drivkällans placering och de konceptuella skillnaderna mellan olika farkoster har på styrningens placering. Samt vilka förväntade egenskaper en farkost får med icke konventionell styrning. Med hjälp av en simulering i MATLAB är syftet att kunna besvara vilken roll massa, hastighet och axellängd spelar för ett bakhjulsstyrt fordon och hur responsen ser ut jämfört med ett framhjulsstyrt fordon. Resultatet från intervjuerna och litteraturen visar att drivkällans placering nära rodret är väldigt viktig för fartygs styrningsförmåga. Däremot för flygplan påverkar det mest lastförmåga och för fordon tyngdpunktens placering. De konceptuella skillnaderna visar på att större fordon har mer att vinna på fyrhjulsstyrning då en mindre vändradie är merkritiskt för dessa och att flygplan som flyger i överljudsfart behöver andra vinguppsättningar. För fartyg har det visat sig att en liten vändradie är viktigt i hamnområden och att både stora och små fartyg då använder sig av bogpropellrar. De förväntade egenskaperna för en ickekonventionell styrning är främst negativ för fordon och fartyg, då det finns risk för instabilitet och överstyrning, medan flygplan redananvänder sig av styrningen fram i form av nosvingar. Simuleringarna visar att ett bakhjulsstyrt fordon bör ha en hastighetsbegränsning då det blir svårkontrollerat i höga hastigheter över 50km/h. En större massa har visat sig hämma magnituden av den laterala accelerationen en i fel riktning och en längre axellängd minskar rotationshastigheten kring gir-led. Resultaten visar också att ett bakhjulsstyrt fordon har en fördröjning av den laterala accelerationen jämfört med ett framhjulsstyrt fordon på 0,1-0,2 sekunder beroende av bland annat massa, axellängd och hastighet. Responstesten visar att denna fördröjning bidrar till att den laterala förflyttningen är fördröjd första sekunden för hastigheter 10-90km/h men att redan efterytterligare 1,5 sekunder är den dubbel så stor för hastigheter 50-90km/h. Slutsatsen är att fordon inte har bakhjulsstyrning i höga hastigheter på grund av den fördröjda responsen i början samt av att utslaget efter några sekunder blir väldigt mycket kraftigare vilket gör fordonet svårt att kontrollera.
Rear wheel steering of vehicles is a possible steering, which has been forgotten in vehicle design. Earlier works show only details concerning one vehicle type from this subject. In this work the author will first present a background to how different vehicles are steered and then the analysis of it. The purpose with this paper is to from literature and interviews answer to which impact the placement of the engine and the conceptual differences have on the steering from different vessels. It will also answer which anticipated properties the steering will have if it´s not placed in a conventional way. Through simulation in MATLAB the paper will answer to which degree mass, velocity and length of axle influences steering behaviour of a rear wheal steered, RWS, car and how the steering response is different to a front wheal steered car, FWS. The result from the literature and the interview shows that placement of engine and propeller near the rudder is very important for a ships steering capability. For vehicles it has most effect on the centrum of gravity, which is to prefer in middle of the vehicle,and for airplanes the ability to place cargo. The conceptual differences shows that a larger vehicle has more to gain, if it is equipped with four wheel steering, due to turning radius is a more critical aspect. For airplanes in super sonic speed it reveals that they need another set of wings. Ships need a smaller turning radius in harbours and all size of ships then use thrusters. The properties of a vessel with not conventional steering are most negative for cars and ships because of risk for oversteering and instability, while for airplanes its already in use in form of canard wings. The simulations display that rear wheel steered vehicle should have a limit of velocity because of its behaviour in high speeds over 50 km/h. A larger mass has shown todepress the magnitude of lateral acceleration in wrong direction and a larger length of an axle is shown to depress the yaw-rate. The result also displays that a RWS vehicle has a delay of the lateral acceleration compared to a FWS vehicle with approximately 0,1-0,2 seconds depending on mass, velocity and length of axle. The test of response indicates that this delay contributes to the delay of the lateral movement of the vehicle the first second for speeds between 10-90 km/h, but after only 1,5 seconds further thelateral movement is twice the value for speeds 50-90km/h. The conclusion is that vehicle doesn’t have RWS due to the delay in response in the beginning and the very larger lateral movement after only seconds later, which makes the vehicle hard to control.

Styles APA, Harvard, Vancouver, ISO, etc.

43

High, Kirsty. « Fading Star : understanding accelerated decay of organic remains at Star Carr ». Thesis, University of York, 2014. http://etheses.whiterose.ac.uk/7433/.

Texte intégral

Résumé :

The early Mesolithic site of Star Carr (approximately 11 ka BP) is widely acknowledged as one of the most important wetland sites in Northern Europe. It has provided some of the most informative archaeological evidence for hunter-gatherer lifestyles in Britain at that time. However, recent observations suggest that the site is no longer providing the conditions necessary for such remarkable archaeological preservation. In 2007 and 2008, excavations at the site uncovered artefacts displaying alarming levels of diagenesis, suggesting that current conditions may be leading to the destruction of any organic material yet to be uncovered. Geochemical and hydrological investigations suggest that this is closely linked to changes occurring due to drying out of the site. However, scientific data regarding the rates and mechanisms of decay in such acidic environments are severely lacking. The aim of this thesis is to apply an experimental approach to investigate the observed deterioration, in order to answer some key questions: Is Star Carr undergoing accelerated deterioration, and if so, how are the changing site conditions contributing to this? Ultimately, by learning more about the key factors facilitating degradation in the specific burial environments at Star Carr, strategies to slow or stop the deterioration can be recommended, both for Star Carr and other wetland archaeological sites. A suite of appropriate analytical methods have been tested and applied to assess deterioration in both bone and wood. It has been shown that as different techniques provide complementary and sometimes contradictory information, a multi-analytical approach is needed. Using these techniques it has been shown that bone mineral rapidly dissolves in acidic solutions, buffering the acidity. As a result, collagen is left exposed and also breaks down leading to the loss of bio-archaeological information. The effects of pH on wood degradation are more subtle, but burial experiments show that drying out of the burial environment can have a severely detrimental effect on the survival of structural polymers in wood. Analysis of material excavated from Star Carr has shown that preservation differs across the site. For bone this is closely related to the geochemical conditions. It seems likely that bone in the current state of preservation would quickly deteriorate further at the low sediment pH recorded. Due to the localised differences in geochemistry and organic preservation across the site, any mitigation strategies aimed at slowing organic decay need to carefully consider all material that may yet be buried, and their varying states of diagenesis. Rapid changes in both materials (bone and wood) following excavation have also been observed. It is recommended that post-excavation strategies be designed to slow or stop these changes.

Styles APA, Harvard, Vancouver, ISO, etc.

44

Kong, Gilbert. « STF ». FIU Digital Commons, 2015. http://digitalcommons.fiu.edu/etd/2307.

Texte intégral

Résumé :

STF is a large ensemble work in three movements: "Fatwa," "Hitchens," and "Albino Sex." It is scored for piano, double bass, cello, viola, violin, French horn, clarinet in Bb, bass clarinet in Bb, flute, baritone, tenor, alto, soprano, narrator, and electronics. Its underlying concept is how religious worldviews can collide with freedom of speech, atheism, and fundamental human rights. In extreme cases, zealots will interpret disease as evidence of divine intervention or even demand the death of blasphemers. The text in the first movement, “Fatwa,” expresses freedom of speech and incorporates passages from Salman Rushdie’s “The Satanic Verses.” The second movement, “Hitchens,” centers on atheism and incorporates two audio excerpts from Christopher Hitchens’s lecture at the 2009 Festival of Dangerous Ideas. In the final movement, “Albino Sex,” I construct a narrative using media headlines, paraphrased biblical verses, and my own text to depict the human rights crisis during the 1980s A.I.D.S. epidemic. Various organizational approaches to text and pitch distinguish one movement from the other; the three movements cohere through unifying devices that I draw from set theory.

Styles APA, Harvard, Vancouver, ISO, etc.

45

Moisseytsev, Anton. « Passive load follow analysis of the STAR-LM and STAR-H2 systems ». Texas A&M University, 2003. http://hdl.handle.net/1969.1/390.

Texte intégral

Résumé :

A steady-state model for the calculation of temperature and pressure distributions, and heat and work balance for the STAR-LM and the STAR-H2 systems was developed. The STAR-LM system is designed for electricity production and consists of the lead cooled reactor on natural circulation and the supercritical carbon dioxide Brayton cycle. The STAR-H2 system uses the same reactor which is coupled to the hydrogen production plant, the Brayton cycle, and the water desalination plant. The Brayton cycle produces electricity for the on-site needs. Realistic modules for each system component were developed. The model also performs design calculations for the turbine and compressors for the CO2 Brayton cycle. The model was used to optimize the performance of the entire system as well as every system component. The size of each component was calculated. For the 400 MWt reactor power the STAR-LM produces 174.4 MWe (44% efficiency) and the STAR-H2 system produces 7450 kg H2/hr. The steady state model was used to conduct quasi-static passive load follow analysis. The control strategy was developed for each system; no control action on the reactor is required. As a main safety criterion, the peak cladding temperature is used. It was demonstrated that this temperature remains below the safety limit during both normal operation and load follow.

Styles APA, Harvard, Vancouver, ISO, etc.

46

Maschberger, Thomas [Verfasser]. « Star formation in galaxies and star clusters / Thomas Maschberger. Mathematisch-Naturwissenschaftliche Fakultät ». Bonn : Universitäts- und Landesbibliothek Bonn, 2011. http://d-nb.info/1019547219/34.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

47

Fialho, Márcio Afonso Arimura. « Improved star identification algorithms and techniques for monochrome and color star trackers ». Instituto Nacional de Pesquisas Espaciais (INPE), 2017. http://urlib.net/sid.inpe.br/mtc-m21b/2017/08.10.22.44.

Texte intégral

Résumé :

This work presents modeling, implementation, testing and simulation of a real-time attitude estimator using extended Kalman filter (FKE), applied to a three-axis air-bearing platform controlled by gas jet actuators. The goal of this work is to obtain an attitude determination algorithm that can replace the attitude estimate from the embedded inertial unit, currently in use by the platform electronics. Two models of estimators were implemented in MATLAB environment: in the first one, the state vector is composed only by the quaternions of the attitude, and in the second, the state vector is composed by quaternions and biases of the three gyroscopes. These estimators were tested using data from the sensors of the platforms inertial unit, and the results were compared with the attitude estimation sent by the internal attitude solution of the inertial unit. Finally, tests of the two FKE algorithms were performed in the simulation model of the air-bearing platform. Both Kalman filter-based estimators were successful in the attitude determination process, both in the tests using real data and in the simulation of control of the air-bearing platform. The proposed bias estimation functioned in a degraded way for the cases tested. We then hypothesized the reasons for this performance, and the convenience of estimating them in the proposed application.
Sensores de estrelas de cabeça-fixa modernos estão entre os sensores de atitude mais precisos disponíveis para uso em veículos espaciais. Seu princípio básico de operação consiste em adquirir imagens do céu e identificar as estrelas presentes nestas imagens, usando as estrelas identificadas como referências de atitude. Este processo engloba tarefas como pré-processamento de imagens, segmentação de imagens, cálculo de centroides, identificação de estrelas e determinação de atitude a partir de versores observados. Na tarefa de identificação de estrelas, este trabalho investiga como as informações de brilho (magnitudes) e cor (quando disponível) podem ser aproveitadas para melhorar a confiabilidade e a velocidade do processo de identificação de estrelas. Ao se incorporar verificações de magnitude e cor em um algoritmo de identificação de estrelas estado da arte, obteve-se uma redução na taxa de identificações incorretas maior que duas ordens de grandeza. Várias outras melhorias foram propostas e implementadas neste algoritmo de identificação de estrelas. Outras contribuições deste trabalho estão no uso de índices de cor (comum em astronomia, mas novo neste campo) na representação de cor em sensores de estrelas, com vantagens em relação à representação anteriormente usada na literatura, e no desenvolvimento de uma metodologia para avaliar a adequação de diferentes índices de cor no processo de identificação de estrelas. Uma investigação sobre tecnologias para imageamento a cores voltada para sensores de estrelas é realizada, na qual se verificou que sensores de imagem baseados em pixels empilhados apresentam potencial para aplicações futuras. Este trabalho também apresenta um algoritmo de pré-processamento de imagens simples para remoção da não uniformidade de coluna em sensores CMOS, desenvolvido para sensores de estrelas com pouca memória e baixo poder computacional. Uma estimativa do limite teórico para a precisão de sensores de estrelas é apresentada. Este limite representa, de certa forma, um limite fundamental para a precisão de sensores de estrelas que depende apenas da distribuição de estrelas na nossa vizinhança estelar, das dimensões físicas do sensor de estrelas e da duração da janela de tempo usada para observação das estrelas, sendo, portanto, completamente independente da tecnologia empregada. A utilidade desta estimativa é que ela provê uma referência ao qual se podem comparar diferentes sensores de estrelas. Esta estimativa foi calculada usando dados dos catálogos de estrelas Hipparcos, Tycho e 2MASS. Até onde o autor tenha conhecimento, o cálculo desta estimativa é uma contribuição original para esta área de pesquisa.

Styles APA, Harvard, Vancouver, ISO, etc.

48

Ferreira, Carolina Gribel de Vasconcelos. « Connecting the cosmic star formation rate with the local star formation rate ». Instituto Nacional de Pesquisas Espaciais (INPE), 2018. http://urlib.net/sid.inpe.br/mtc-m21b/2018/02.05.17.02.

Texte intégral

Résumé :

We present a model that unifies the cosmic star formation rate (CSFR), obtained through the hierarchical structure formation scenario, with the (Galactic) local star formation rate (SFR). It is possible to use the SFR to generate a CSFR mapping through the density probability distribution functions (PDFs) commonly used to study the role of turbulence in the star-forming regions of the Galaxy. We obtain a consistent mapping from redshift z 20 up to the present (z = 0). Our results show that the turbulence exhibits a dual character, providing high values for the star formation efficiency (h"i 0.32) in the redshift interval z 3.5−20 and reducing its value to h"i = 0.021 at z = 0. The value of the Mach number (Mcrit), from which h"i rapidly decreases, is dependent on both the polytropic index (􀀀) and the minimum density contrast of the gas. We also derive Larsons first law associated with the velocity dispersion (hVrmsi) in the local star formation regions. Our model shows good agreement with Larsons law in the 0.1 − 30pc range (when our model is compared to the observational data), providing typical temperatures T0 2−50K for the gas associated with star formation. As a consequence, dark matter halos of great mass could contain a number of halos of much smaller mass, and be able to form structures similar to globular clusters. Thus, Larsons law emerges as a result of the very formation of large-scale structures, which in turn would allow the formation of galactic systems, including our Galaxy.
Apresentamos um modelo que unifica a Taxa Cósmica de Formação Estelar (CSFR em inglês), obtida atravez do cenário de formação de estruturas, com a taxa de formação estelar local (Galáctica) (SFR em inglês). É possível utilizar a SFR para gerar um mapa da CSFR através da função de distribuição de probabilidade (PDFs) da densidade comumente utilizada no estudo do papel da turbulência nas regiões de formação estelar na Galáxia. Obtemos um mapa consistente a partir de redshift z 20 até o presente (z = 0). Nossos resultados mostram que a turbulência exibe um caráter dual, resultando em altos valores para a eficiência de formação estelar (h"i 0.32) no intervalo de redshift z 3.5 − 20 e reduzindo seu valor para h"i = 0.021 em z = 0. O valor do número de Mach (Mcrit), para o qual h"i decresce rapidamente, é dependente em ambos do índice politrópico (􀀀) e do contraste de densidade do gás (scrit). Derivamos a primeira Lei de Larson associada a disperção de velocidade (hVrmsi) nas regiões de formação de estelar local. Nosso modelo mostra boa concordância com a Lei de Larson no intervalo 0.1 − 30pc (quando nosso modelo é comparado com dados observacionais), com temperaturas típicas T0 2 − 50K para o gás associado a formação estelar. Como consequência, os halos de matéria escura com maior massa poderiam conter halos de menor massa, formando estruturas semelhantes aos aglomerados globulares. Sendo assim, a Lei de Larson emerge como um resultado da formação estelar cosmológica e vinculada com a formação das estruturas em grande escala do universo, da qual possibilitaria a formação de sistemas galacticos, incluindo a nossa Galáxia.

Styles APA, Harvard, Vancouver, ISO, etc.

49

Reza, Bayar, et Anna Törnkvist. « INGEN STYR ALLA, ALLA STYR VARANDRA : En platt organisationsstruktur utan formellt ledarskap ». Thesis, Umeå universitet, Sociologiska institutionen, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-149887.

Texte intégral

Résumé :

Syftet med studien var att undersöka hur medarbetarna i ett företag som organiseras utifrån självstyrande team upplever egenmakt beroende på hur gruppen fungerar. Utifrån syftet genererades frågeställningen Vad utgör ledning i företaget med platt struktur när en formell chef saknas, och hur upplevs denna form av ledning? För att besvarar detta utfördes en fallstudie på Björn Lundéns Information AB där nio kvalitativa intervjuer genomfördes med anställda på företaget. Genom semistrukturerade intervjuer fick de anställda fritt tolka och svara på frågor rörande gruppkultur och egenmakt. Som analysredskap användes forskning och teorier om demokratiska arbetsplatser utan hierarkisk ledning, empowerment, distribuerat ledarskap och grupprocesser i form av konformitet, konsensus, grupptänkande och emotionell intelligens. Analysen visade att den enskilde känner ytterst ansvar och leds av kundens och arbetsgruppens tycke. I företaget finns det ingen chef eller formell ledare som bestämmer utan istället utgör kulturen styrning för gruppen och reglerar således beteenden. Gruppkulturen hindrar egenmakt i situationer där gruppens harmoni och sammanhållning kan störas av individuella kontraster. Samtidigt är gruppens kultur tillåtande och stöttande via frihet. Därmed kan de anställda delta och engagera sig i den utsträckning som önskas och således skapas en känsla av egenmakt i en proportion som varje enskild anställd känner sig tillfreds med.

Styles APA, Harvard, Vancouver, ISO, etc.

50

Grundström, Kristin. « Som en stor labyrint ». Thesis, Linköping University, Department of Computer and Information Science, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-2588.

Texte intégral

Résumé :

I studien undersöktes hur universitetsområdet i Linköping och Norrköping är att hitta på, hur den mentala bilden av området ser ut och hur de som rör sig där talar om området. Perspektivet var kognitionsvetenskapligt. Arbetet strukturerades kring intervjuer och enkäter med 20 personer, hälften från vartdera universitetsområdet. Den mentala bilden av området liksom uppfattningarna om var det var lätt respektive svårt att hitta skiljde sig åt. Alla reagerar inte på samma sätt inför olika mönster och system. En del hus har dessutom en sådan utformning att den i sig själv försvårar för personer att hitta där. En ytterligare slutsats är att det var svårt att överföra den mentala bilden av universitetsområdet till ett papper, särskilt när det gäller avstånd och storlek. Den mentala bilden visade sig vara något förvrängd. Verbalt sett fanns det skillnader mellan Linköping- och Norrköpingsgruppen i hur de uttryckte sig om respektive universitetsområde. Norrköpingsgruppen tenderade att oftare använda väderstreckstermer.

Styles APA, Harvard, Vancouver, ISO, etc.

Nous offrons des réductions sur tous les plans premium pour les auteurs dont les œuvres sont incluses dans des sélections littéraires thématiques. Contactez-nous pour obtenir un code promo unique!