Log in

Relevant bibliographies by topics / Double stars / Dissertations / Theses

To see the other types of publications on this topic, follow the link: Double stars.

Dissertations / Theses on the topic 'Double stars'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 dissertations / theses for your research on the topic 'Double stars.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.

1

Komonjinda, Siramas. "A study of binary star orbits using precise radial velocity measurements with the HERCULES spectrograph." Thesis, University of Canterbury. Department of Physics and Astronomy, 2008. http://hdl.handle.net/10092/1590.

Full text

Abstract:

Orbits of spectroscopic binary systems have been studied for more than a century. Over three thousand orbits of spectroscopic binary systems have been derived. These orbits are based on the radial velocities measured from the spectra recorded by a photographic plate to a high precision spectrum observed from a modern spectrograph. In many cases, the shape of the orbit was assumed to be circular, of hence the eccentricity is zero. This assumption is based on the fact that a small eccentricity (e < 0.1) measured from the observed data might be a result from the error of observations or from the

APA, Harvard, Vancouver, ISO, and other styles

2

Bascoul, Guillaume Pierre. "Double-diffusive convection in stars." Thesis, University of Cambridge, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.613006.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Bauer, Christina, of Western Sydney Nepean University, and Faculty of Science and Technology. "Astrometric observations of wide southern double stars." THESIS_FST_XXX_Bauer_C.xml, 1995. http://handle.uws.edu.au:8081/1959.7/251.

Full text

Abstract:

Observations were made of 309 binary systems between RA 17h - 07h and Dec -70 degrees to -60 degrees. The images were calibrated against pairs measured for CCD astometry. Measurements were made of separations, position angles and differential magnitudes. Uncertainties in position angle and separation were 7.8o/p and 0.16 arcseconds respectively. The position angles, separations and differential V magnitudes were compared with WDS figures. It was determined that only 29% _+ 5% of the observed pairs had undergone significant movement since the last previous measurement, which agrees with the res

APA, Harvard, Vancouver, ISO, and other styles

4

Bauer, Christina. "Astrometric observations of wide southern double stars." Thesis, View thesis, 1995. http://handle.uws.edu.au:8081/1959.7/251.

Full text

Abstract:

Observations were made of 309 binary systems between RA 17h - 07h and Dec -70 degrees to -60 degrees. The images were calibrated against pairs measured for CCD astometry. Measurements were made of separations, position angles and differential magnitudes. Uncertainties in position angle and separation were 7.8o/p and 0.16 arcseconds respectively. The position angles, separations and differential V magnitudes were compared with WDS figures. It was determined that only 29% _+ 5% of the observed pairs had undergone significant movement since the last previous measurement, which agrees with the res

APA, Harvard, Vancouver, ISO, and other styles

5

Bauer, Christina. "Astrometric observations of wide southern double stars /." View thesis, 1995. http://library.uws.edu.au/adt-NUWS/public/adt-NUWS20030827.113613/index.html.

Full text

APA, Harvard, Vancouver, ISO, and other styles

6

Wainwright, C. L. "The effects of spin-orbit coupling on gravitational wave uncertainties." Pomona College, 2007. http://ccdl.libraries.claremont.edu/u?/stc,20.

Full text

Abstract:

Paper discusses the expected uncertainty of orbital parameters of binary stars as measured by the space-based gravitational wave observatory LISA (Laser Interferometer Space Antenna) and how the inclusion of spin in the model of the binary stars affects the uncertainty. The uncertainties are found by calculating the received gravitational wave from a binary pair and then performing a linear least-squares parameter estimation. The case of a 1500 solar mass black hole that is 20 years from coalescing with a 1000 solar mass black hole--both of which are 50 x 10^6 light years away--is analyzed, an

APA, Harvard, Vancouver, ISO, and other styles

7

Chanamé, Domínguez Julio César. "Topics of galactic structure and stellar and chemical evolution." Connect to resource, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1126128106.

Full text

Abstract:

Thesis (Ph. D.)--Ohio State University, 2005.<br>Title from first page of PDF file. Document formatted into pages; contains xv, 286 p.; also includes graphics (some col.). Includes bibliographical references (p. 275-286). Available online via OhioLINK's ETD Center

APA, Harvard, Vancouver, ISO, and other styles

8

Xu, Huangjian. "A study of the binary radio star LSI +61 303." Thesis, University of British Columbia, 1987. http://hdl.handle.net/2429/28358.

Full text

Abstract:

We present new 6 cm observations of the binary radio, X-ray and ɿ -ray star GT0236+610 (LSI+61°303) obtained in August 1984 and September 1986. Ve calculate an improved period for the source's periodic radio outbursts of 26.50 ± 0.03 days. No significant period derivative was found. Based on an analysis of 201 flux density measurements from 1977 August to 1986 September, we find evidence for a possible 4 year modulation of the amplitude of the 26.50 day periodic radio outbursts. A precessing jet model for this long period modulation is discussed.<br>Science, Faculty of<br>Physics and Astronomy

APA, Harvard, Vancouver, ISO, and other styles

9

Rainger, Paul P. "Studies of low-mass interacting binary stars." Thesis, University of St Andrews, 1990. http://hdl.handle.net/10023/14369.

Full text

Abstract:

Spectroscopic and photometric observations of eight contact/near-contact binaries are presented and analysed. Spectroscopic observations were obtained at 4200 Å (radial velocity spectra) and 6563 Å (hydrogen-alpha line profiles). New photometric observations were obtained at visual and infrared wavelengths, and other previously published light curves are also re-analysed. Absolute dimensions have been obtained for five systems; TY Boo, VW Boo, BX And, SS Ari and AG Vir, and their evolutionary positions discussed. Four of the systems are found to be in marginal but poor thermal contact, exhib

APA, Harvard, Vancouver, ISO, and other styles

10

Edwards, Philip Gregory. "A search for ultra high energy gamma ray emission from binary X-ray systems." Title page, contents and summary only, 1988. http://web4.library.adelaide.edu.au/theses/09PH/09phe266.pdf.

Full text

APA, Harvard, Vancouver, ISO, and other styles

11

Dunstone, Nicholas J. "Prominences and magnetic activity on young single and binary stars." Thesis, St Andrews, 2008. http://hdl.handle.net/10023/499.

Full text

APA, Harvard, Vancouver, ISO, and other styles

12

龔碧平 and Biping Gong. "Binary pulsar PSR1913+16 as a laboratory for gravitomagnetism and structure of neutron stars." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2001. http://hub.hku.hk/bib/B31241736.

Full text

APA, Harvard, Vancouver, ISO, and other styles

13

Gong, Biping. "Binary pulsar PSR1913+16 as a laboratory for gravitomagnetism and structure of neutron stars." Hong Kong : University of Hong Kong, 2001. http://sunzi.lib.hku.hk/hkuto/record.jsp?B23234490.

Full text

APA, Harvard, Vancouver, ISO, and other styles

14

Dermine, Tijl. "Binary evolution in the light of barium and related stars." Doctoral thesis, Universite Libre de Bruxelles, 2011. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/209858.

Full text

Abstract:

Si l'évolution des étoiles simples est relativement bien comprise, l'étude des étoiles binaires, qui représentent la majorité des étoiles, nécessite encore des progrès majeurs, particulièrement en ce qui concerne leurs différents modes d'interactions. Dans ces systèmes, la composition de surface d'une étoile peut être altérée non seulement par l'accrétion d'éléments synthétisés au sein de l'étoile compagnon, mais également par des processus de mélanges internes induits par les forces de marées et d'un transport du moment angulaire. Plusieurs classes d'étoiles post-transfert de masse (les étoil

APA, Harvard, Vancouver, ISO, and other styles

15

Kiel, Paul Douglas. "Populating the galaxy with pulsars." Swinburne Research Bank, 2009. http://hdl.handle.net/1959.3/64888.

Full text

Abstract:

Thesis (Ph.D) - Swinburne University of Technology, Faculty of Information & Communication Technologies, 2009.<br>A dissertation presented in fulfillment of the requirements for the degree of Doctor of Philosophy, [Faculty of Information and Communication Technologies], Swinburne University of Technology, 2009. Typescript. Bibliography: p. 207-223.

APA, Harvard, Vancouver, ISO, and other styles

16

Reynolds, Alastair P. "A spectroscopic study of high mass X-ray binaries." Thesis, University of St Andrews, 1992. http://hdl.handle.net/10023/14509.

Full text

Abstract:

Observations of four massive x-ray binary stars are presented, based on data accumulated between February 1989 and August 1991. Using modern techniques of spectroscopic data analysis, velocity curves are derived for three of these systems. Two of these curves (SMC X-1, QV Nor) yield very precise mass estimates for the component stars, while the third (Cen X-3) offers a constraint on the possible masses. The fourth system (X Per) is not shown to exhibit periodic variations, despite an extensive study conducted over more than two years. For the two systems that yielded precise masses, the compon

APA, Harvard, Vancouver, ISO, and other styles

17

Dudley, Richard E. "A spectroscopic investigation of the hydro-deficient binary Upsilon Sgr, and related objects." Thesis, University of St Andrews, 1992. http://hdl.handle.net/10023/14426.

Full text

Abstract:

The bright hydrogen-deficient binary Upsilon Sgr has been studied in detail in the areas of radial velocities, flux distribution, temperature, surface gravity, composition and mass loss using the analysis of spectroscopic data. From IUE high resolution spectra the primary radial velocity orbit has been confirmed (K1 = 47.3±0.8kms−1) and the secondary radial velocity curve determined for the first time (K2 = 29.7±1.7kms−1). The orbit has been constrained to an inclination of 65 - 78°. The masses of the primary and secondary are then 3.0 ± 0.3 and 4.8 ± 0.5M☉ respectively, with an orbital separa

APA, Harvard, Vancouver, ISO, and other styles

18

Pourbaix, Dimitri. "Space astrometry of unresolved binaries: from Hipparcos to Gaia." Doctoral thesis, Universite Libre de Bruxelles, 2007. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210649.

Full text

Abstract:

Building upon its success with the Hipparcos space astrometry mission launched in 1989, the European Space Agency has agreed to fund the construction of its successor, Gaia, and its launch in 2011. Despite the similarities between the two missions, Gaia will be orders of magnitude more powerful, more sensitive, but also more complex in terms of data processing. Growing from 120,000 stars with Hipparcos to about 120,000E4 stars with Gaia does not simply mean pushing the computing resources to their limits (1 second of processing per star yields 38 years for the whole Gaia-sky). It also means fa

APA, Harvard, Vancouver, ISO, and other styles

19

Deschamps, Romain. "Evolution of low and intermediate mass stars in binary systems: a new look at Algol systems." Doctoral thesis, Universite Libre de Bruxelles, 2015. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/209077.

Full text

Abstract:

Despite being observed since the XVIIIth century, Algol systems and related objects are<p>still rather poorly understood. We know that they are composed by a generally B-A main sequence<p>star and a lighter but more evolved companion star. This paradox is explained by the transfer of mass<p>between the two stars, but new problems arose. In particular, I studied the mass-transfer driven spin-<p>up of the accreting star that drives the star to critical rotation and the puzzling, indirectly observed, non-conservative evolution.<br>Doctorat en Sciences<br>info:eu-repo/semantics/nonPublished

APA, Harvard, Vancouver, ISO, and other styles

20

Hall, Philip David. "The structure of common-envelope remnants." Thesis, University of Cambridge, 2015. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.690023.

Full text

APA, Harvard, Vancouver, ISO, and other styles

21

Froning, Cynthia Suzanne. "The near-infrared properties of compact binary systems /." Digital version accessible at:, 1999. http://wwwlib.umi.com/cr/utexas/main.

Full text

APA, Harvard, Vancouver, ISO, and other styles

22

Skillen, W. J. Ian. "Fourier analysis of unequally-spaced time series : with applications to the study of helium stars and binary systems." Thesis, University of St Andrews, 1986. http://hdl.handle.net/10023/11105.

Full text

Abstract:

The application of the discrete Fourier transform to the determination of the frequency content of unevenly-sampled astronomical time series is discussed, and an interactive computer package which incorporates a variety of power-spectrum and time-domain techniques is described. A frequency analysis of the light curves of two hot, extreme helium stars, BD-9°4395 and HD160641, shows that their photometric variability is caused by non-radial pulsation. Spectroscopic evidence in support of non-uniform mass loss is presented for BD-9°4395. Spectroscopic and photometric observations of two early-typ

APA, Harvard, Vancouver, ISO, and other styles

23

Ninkov, Zoran. "Observation and interpretation of the Cygnus X-1 system." Thesis, University of British Columbia, 1985. http://hdl.handle.net/2429/25951.

Full text

Abstract:

The results of a long term monitoring program on the massive X-ray binary Cygnus X-1, whose constituents are believed to consist of a normal 0 star primary and a black hole companion, are presented. Spectra of this system were collected between 1980 and 1984 using a Reticon detector. The resulting absorption line radial velocity (RV) curve is characteristic of a single line spectroscopic binary. These velocities were combined with those available in the literature to determine an orbital period of 5.59977 ± 0.00001 days. A P/P ≃ 10⁻⁵ day⁻¹ was found from analysis of all available vel

APA, Harvard, Vancouver, ISO, and other styles

24

Simonian, Gregory Vahag Aghabekian. "Double Trouble: The Impact of Binarity on Large Stellar Rotation Datasets." The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1563439631310165.

Full text

APA, Harvard, Vancouver, ISO, and other styles

25

Fender, Robert P. "Multiwavelength behaviour of Cygnus X-3 and related objects." N.p, 1995. http://oro.open.ac.uk/19192/.

Full text

APA, Harvard, Vancouver, ISO, and other styles

26

Johnson, Christian I., R. Michael Rich, Nelson Caldwell, et al. "Exploring the Chemical Composition and Double Horizontal Branch of the Bulge Globular Cluster NGC 6569." IOP PUBLISHING LTD, 2018. http://hdl.handle.net/10150/626525.

Full text

Abstract:

Photometric and spectroscopic analyses have shown that the Galactic bulge cluster Terzan 5 hosts several populations with different metallicities and ages that manifest as a double red horizontal branch (HB). A recent investigation of the massive bulge cluster NGC 6569 revealed a similar, though less extended, HB luminosity split, but little is known about the cluster's detailed chemical composition. Therefore, we have used high- resolution spectra from the Magellan-M2FS and VLT-FLAMES spectrographs to investigate the chemical compositions and radial velocity distributions of red giant branch

APA, Harvard, Vancouver, ISO, and other styles

27

Bode, Lisa Merle Theatre Film &amp Dance UNSW. "From shadow citizens to teflon stars : cultural responses to the digital actor." Awarded by:University of New South Wales. Theatre, Film and Dance, 2005. http://handle.unsw.edu.au/1959.4/20593.

Full text

Abstract:

This thesis examines an intermittent uncanniness that emerges in cultural responses to new image technologies, most recently in some impressions of the digital actor. The history of image technologies is punctuated by moments of fleeting strangeness: from Maxim Gorky's reading of the cinematographic image in terms of 'cursed grey shadows', to recent renderings of the computer-generated cast of Final Fantasy: The Spirits Within as silicon-skinned mannequins. It is not merely the image's unfamiliar and new aesthetics that render it uncanny. Rather, the image is received within a cultural framewo

APA, Harvard, Vancouver, ISO, and other styles

28

Patterson, J. Douglas. "CCD photometry of three short-period binary systems." Virtual Press, 1993. http://liblink.bsu.edu/uhtbin/catkey/865934.

Full text

Abstract:

The goal of this study was to obtain photometry of three poorly studied close binary star systems. These observations were obtained at Lowell Observatory in Flagstaff, Arizona and the Ball State University Observatory. In both cases charged coupled device detectors were used. Light variations were detected in all three stars. For one of the binaries the temperatures of the component stars were found by fitting multi-color light curves with black body models. In addition, the temperature difference between the two hemispheres of the secondary star was found. This difference is believed to be th

APA, Harvard, Vancouver, ISO, and other styles

29

Andronov, Nikolay I. "Evolution of close binary stars with application to cataclysmic variables and Blue Stragglers." Connect to resource, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1126025974.

Full text

Abstract:

Thesis (Ph. D.)--Ohio State University, 2005.<br>Title from first page of PDF file. Document formatted into pages; contains xii, 190 p.; also includes graphics (some col.). Includes bibliographical references (p. 181-190). Available online via OhioLINK's ETD Center.

APA, Harvard, Vancouver, ISO, and other styles

30

Gritton, Jeffrey A. "Near-contact binary spotting activity : the effect of a common atmosphere." Virtual Press, 2008. http://liblink.bsu.edu/uhtbin/catkey/1391477.

Full text

Abstract:

In this investigation of near-contact binary stars, the author fit a synthetic light, computer generated, curve model to observations by adjusting various parameters of two near-contact binary pairs, CN Andromeda and TZ Draconis. By fitting asymmetries in the light curves using spotting parameters, the spotting activity for both stars can be determined. From the spotting parameters it is possible to compare the spotting activity of these two near-contact binaries to the spotting activity of 47 contact binaries (Csizmadia et al., 2004). The author determined that, for both TZ Dra and CN And, sp

APA, Harvard, Vancouver, ISO, and other styles

31

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

Full text

Abstract:

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.

APA, Harvard, Vancouver, ISO, and other styles

32

Paredes, Fortuny Xavier. "Observational and theoretical study of the interaction of relativistic winds from young pulsars with inhomogeneous stellar winds." Doctoral thesis, Universitat de Barcelona, 2016. http://hdl.handle.net/10803/400492.

Full text

Abstract:

Gamma-ray binaries are systems that comprise a compact object orbiting a companion star and display the maximum of the non-thermal Spectral Energy Distribution (SED) in gamma rays. Currently we know five gamma-ray binaries. All of them host an early type star and a compact object of unknown nature, either a black hole or a neutron star, except for one of them where radio pulsations have been detected. The optical emission received from gamma-ray binaries is produced by the optical star and its environment. If the optical star is a Be star, then it presents a circumstellar decretion disk, be

APA, Harvard, Vancouver, ISO, and other styles

33

Subasavage, Jr John P. "White Dwarfs in the Solar Neighborhood." Digital Archive @ GSU, 2007. http://digitalarchive.gsu.edu/phy_astr_diss/15.

Full text

Abstract:

The study of white dwarfs (WDs) provides insight into understanding WD formation rates, evolution, and space density. Individually, nearby WDs are excellent candidates for astrometric planetary searches because the astrometric signature is greater than for an identical, more distant WD system. As a population, a complete volume-limited sample is necessary to provide unbiased statistics; however, their intrinsic faintness has allowed some to escape detection. The aim of this dissertation is to identify nearby WDs, accurately characterize them, and target a subset of potentially interesting WD

APA, Harvard, Vancouver, ISO, and other styles

34

Moreno, de la Cita Víctor. "Coupling fluid-dynamics and non-thermal processes to study sources of high-energy emission." Doctoral thesis, Universitat de Barcelona, 2017. http://hdl.handle.net/10803/403843.

Full text

Abstract:

In this thesis we have developed a tool for the computation of non-thermal emission in astrophysical sources. The code reads the hydrodynamic data coming from relativistic hydrodynamic simulations and compute the injection, evolution and radiation of non-thermal particles. The emission channels explored in the thesis are mainly Inverse Compton (IC) and synchrotron. Making use of this tools, we have studied the following sources: Star-jet interactions in agn Some galaxies with an Active Galactic Nucleus (AGN) present two jets of relativistic particles. The pressence of this jets is linked w

APA, Harvard, Vancouver, ISO, and other styles

35

BARBIERI, CLAUDIO. "Electromagnetic counterparts of double neutron star and black hole-neutron star binary mergers." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2021. http://hdl.handle.net/10281/299795.

Full text

Abstract:

Questa tesi di dottorato è focalizzata sulle controparti elettromagnetiche (EM) dei segnali di onde gravitazionali (GW) generati dai merger di sistemi di due stelle di neutroni (NSNS) e sistemi buco nero-stella di neutroni (BHNS). Ho sviluppato dei modelli semi-analitici per prevedere l’emissione a varie lunghezze d’onda dai merger di BHNS, includendo la kilonova, il suo radio remnant, la prompt emission del getto relativistico e il seguente gamma-ray burst (GRB) afterglow. Adottando delle formule di fit dalla letteratura, ho stabilito un legame tra i parametri della binaria e le proprietà del

APA, Harvard, Vancouver, ISO, and other styles

36

Dewi, Jasinta Dini Maria. "From Be/X-ray binaries to double neutron star systems." [S.l. : Amsterdam : s.n.] ; Universiteit van Amsterdam [Host], 2003. http://dare.uva.nl/document/91655.

Full text

APA, Harvard, Vancouver, ISO, and other styles

37

Moldón, Vara Francisco Javier. "Structure and nature of gamma-ray binaries by means of VLBI observations." Doctoral thesis, Universitat de Barcelona, 2012. http://hdl.handle.net/10803/96996.

Full text

Abstract:

Gamma-ray binaries are extreme systems that produce non-thermal emission from radio to very-high-energy (above TeV) gamma rays, with the energy output in the spectral energy distribution (SED) dominated by the MeV–GeV photons. Their broadband emission is usually modulated by the orbital cycle of the system, which suggests that the physical conditions are also periodic and reproducible. The diversity of systems, together with the reproducibility of the conditions within each system, makes gamma-ray binaries excellent physical laboratories in which high energy particle acceleration, diffusion, a

APA, Harvard, Vancouver, ISO, and other styles

38

Napoletano, Anna Grazia <1987&gt. "A double chance to investigate populist influence: The Five Star Movement." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2022. http://amsdottorato.unibo.it/10496/1/Napoletano_Anna%20Grazia_Tesi.pdf.

Full text

Abstract:

In the last decade, new kinds of European populist parties and movements characterized by a left wing, right wing or “eclectic” attitude have succeeded in entering in governments where they could exert a direct populist influence on their coalition partners or, conversely, become victims themselves of the influence of the institutional background. Such a scenario brought this research to formulate two questions: (i) “To what extent did populist parties succeed in influencing their government coalition partners, leading them to adopt populist rhetoric and change their policy positions?” and (ii

APA, Harvard, Vancouver, ISO, and other styles

39

Munar, i. Adrover Pere. "High energy processes in young stellar objects and high-mass X-ray binaries." Doctoral thesis, Universitat de Barcelona, 2014. http://hdl.handle.net/10803/144509.

Full text

Abstract:

The high energy astrophysics, specifically the gamma-ray astrophysics, studies the processes that cannot be caused by hot matter but by other mechanisms colled non thermaland processes, which involve matter with energies above ~ 1 MeV. There are currently a number of instruments able to detect this radiation, such as AGILE and Fermi satellites or Cherenkov telescopes like MAGIC at the Earth's surface. In this thesis we studied two main types of systems that, as it has been observed or theoretically predicted, can produce gamma radiation : young stellar objects and high-mass X-ray binarie

APA, Harvard, Vancouver, ISO, and other styles

40

Walsh, A. P. "New perspectives on magnetotail dynamic processes from combined cluster and double star observations." Thesis, University College London (University of London), 2009. http://discovery.ucl.ac.uk/18606/.

Full text

Abstract:

In this thesis, observations of the Earth's magnetotail from ESA's four Cluster and the two Sino-European Double Star spacecraft are presented. The observations are of intervals where data from the combination of Cluster and Double Star provide insights into the dynamics of the magnetotail that are not possible using data from one mission alone. In the first study, observations of three magnetic flux ropes are presented, two of which were detected near-simultaneously at Cluster and Double Star TC-1, while the third was detected by Cluster, along with a TCR a few minutes later. The observations

APA, Harvard, Vancouver, ISO, and other styles

41

Cury, Luiz Alberto. "Ressonâncias Stark e tunelamento em heteroestruturas semicondutoras." Universidade de São Paulo, 1987. http://www.teses.usp.br/teses/disponiveis/54/54131/tde-19052009-112933/.

Full text

Abstract:

Neste trabalho determinamos a estrutura dos níveis dos estados quase-ligados e virtuais em sistemas de poços quânticos acoplados de AlGaAs-GaAs na presença de um campo elétrico externo (Voltagem) perpendicular às camadas semicondutoras. As heteroestruturas de AlGaAs-GaAs são modeladas por um conjunto de poços quânticos de potencial unidimensionais. Utilizamos a aproximação de função envelope que reduz o problema à solução usual da Equação de Schroedinger de massa efetiva. Os níveis eletrônicos são então determinados utilizando a solução exata da Eq. de Schroedinger em termos das funções de Air

APA, Harvard, Vancouver, ISO, and other styles

42

Hill, Grant Michael. "Discovery of a double binary and nonradial pulsations in the Be star omicron Andromedae." Thesis, University of British Columbia, 1988. http://hdl.handle.net/2429/27937.

Full text

Abstract:

The multiple star system omicron Andromedae has been studied using high signal-to-noise ratio Reticon spectra. The narrow absorption features superimposed on the rotationally broadened Mg II ⋋ 4481 line of o And A are almost certainly from the spectrum of o And B which is shown to be a double-lined spectroscopic binary with a period of 33 days. The speckle interferometrically measured separations of A-a and A-B indicate that the system contains at least two binaries separated by some 25 AU, based on a parallax of 0.015 ± 0.008 arcseconds. Based on this parallax the A-a separation of is about 4

APA, Harvard, Vancouver, ISO, and other styles

43

Douchin, Dimitri. "Estimation de la fraction binaire de nébuleuses planétaires." Thesis, Montpellier 2, 2014. http://www.theses.fr/2014MON20069/document.

Full text

Abstract:

Les nébuleuses planétaires (NP) sont le produit de l'évolution d'étoiles de masses intermédiaires après leur expansion sphérique à la fin de leurs vies. Il a été estimé observationnellement que 80 % des NP ont des formes non-sphériques. Une fraction si élevée est déroutante et a mobilisé la communauté de recherche sur les NP pendant plus de trente ans. Un scénario qui permettrait de justifier les formes observées serait que les étoiles progénitrices de noyaux de NP (NNP) ne sont pas simples, mais possèdent un compagnon. Les formes des nébuleuses seraient ainsi le résultat de l'interaction avec

APA, Harvard, Vancouver, ISO, and other styles

44

Benbakoura, Mansour. "Evolution des étoiles de faible masse en interaction : observations multi-techniques et modélisation des systèmes multiples." Thesis, Université de Paris (2019-....), 2019. http://www.theses.fr/2019UNIP7027.

Full text

Abstract:

Cette thèse est consacrée à l'étude des étoiles de faible masse ayant dans leur environnement proche d'autres étoiles ou des planètes. Nous nous sommes concentrés sur l'influence des interactions avec ces compagnons sur l'évolution stellaire ainsi que leurs conséquences observables.Dans la première partie, nous présentons le modèle d'évolution des systèmes étoile–planète que nous avons développé au cours de cette thèse, nommé ESPEM (Évolution des Systèmes Planétaires Et Magnétisme). Ce modèle prend en compte de façon ab-initio des effets du vent stellaire magnétisé et de la dissipation de maré

APA, Harvard, Vancouver, ISO, and other styles

45

Guedon, Magalie. "Développement et mise en œuvre de détecteurs silicium à micropistes pour l'expérience STAR." Université Louis Pasteur (Strasbourg) (1971-2008), 2005. https://publication-theses.unistra.fr/public/theses_doctorat/2005/GUEDON_Magalie_2005.pdf.

Full text

Abstract:

Cette étude s'inscrit dans le cadre de la recherche de la formation d'un plasma de quarks et de gluons dans l'expérience STAR au RHIC. Elle concerne l'ajout d'un ensemble cylindrique de détecteurs en silicium, à micropistes, double face (SSD) au trajectographe interne du détecteur STAR. Cet ajout permet une amélioration globale de la trajectographie du détecteur STAR. Le SSD forme un cylindre de 1 m de long pour 23 cm de rayon et est composé de 320 modules compacts identiques. Les modules sont formés d'un détecteur, de 12 circuits de lecture ALICE 128C, de 12 rubans TAB, d'un circuit de contrô

APA, Harvard, Vancouver, ISO, and other styles

46

Zabalza, de Torres Victor. "The keV-TeV connection in gamma-ray binaries." Doctoral thesis, Universitat de Barcelona, 2011. http://hdl.handle.net/10803/33649.

Full text

Abstract:

Gamma-ray binaries are systems that comprise a young, massive star and a compact object that can be either a young pulsar or a black hole. They emit radiation from radio up to tens of TeV and show flux variability along the whole electromagnetic spectrum. For three of the four detected gamma-ray binaries, the nature of the compact object is unknown. In this thesis we present a study of gamma-ray binaries through three approaches that involve the simultaneous study of these sources in X-rays and very high energy (VHE) gamma-rays. We present the discovery of correlated X-ray and VHE gamma-ray

APA, Harvard, Vancouver, ISO, and other styles

47

Dabbs, Ashlie C. "The Invisibility of “Second Sight”: Double Consciousness in American Literature and Popular Culture." Bowling Green State University / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1319390310.

Full text

APA, Harvard, Vancouver, ISO, and other styles

48

Leight, William (William Axel). "Neutral Pion Double Helicity Asymmetry in Polarized Proton-Proton Collisions at [the square root of sigma]=200 GeV at STAR." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/77085.

Full text

Abstract:

Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 2012.<br>Cataloged from PDF version of thesis. In title on title page, "the square root of sigma" appears as the mathematical symbol.<br>Includes bibliographical references (p. 109-112).<br>One of the primary goals of the spin physics program at the STAR experiment is to constrain the polarized gluon distribution function, [delta]g(X,Q²), by measuring the double longitudinal spin asymmetry, ALL, of various final-state channels. Neutral pions provide a potentially powerful final state because they are copiously produced i

APA, Harvard, Vancouver, ISO, and other styles

49

Olvitt, Daniel L. "Measurement of the Longitudinal Double Spin Asymmetry for Dijet Production in Polarized Proton+Proton Collisions at sqrt(s) = 510 GeV at STAR." Diss., Temple University Libraries, 2017. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/480255.

Full text

Abstract:

Physics<br>Ph.D.<br>Understanding what contributes to the intrinsic angular momentum (spin) of the proton has been a major goal of the nuclear physics community. In the 1980s, it was discovered that quarks contribute 30% to the spin of the proton. This information led to a search to find other contributions to the spin of the proton. At STAR, the double spin asymmetry (ALL) is measured as it is sensitive to the polarized gluon distribution (Dg(x)). The STAR 2009 inclusive jet ALL at sqrt(s) = 200 GeV has been incorporated into two independent global fits. These fits show for the first time a s

APA, Harvard, Vancouver, ISO, and other styles

50

Teo, Nikki Jern-Li. "Developing Countries at the Double Taxation Negotiating Table and the United Nations’ False Start at Global Tax Coordination: The Fiscal Commission Years (1946–1954)." Thesis, The University of Sydney, 2021. https://hdl.handle.net/2123/25867.

Full text

Abstract:

This thesis is an archive-based research on the UN’s initial efforts at global tax coordination under its Fiscal Commission in succeeding the mantle of the Fiscal Committee of the League of Nations. It focuses on explaining, within the context of international relations and global political economy, the progress, or lack thereof, of double taxation matters by the UN during the first decade of the American-led post-WWII world order. The narrative reveals, firstly, developing countries’ fierce contention in guarding and asserting source taxation rights to advance their economic development, an

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!