• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 15
  • 4
  • 2
  • 1
  • 1
  • 1
  • 1
  • Tagged with
  • 29
  • 7
  • 7
  • 6
  • 6
  • 6
  • 5
  • 5
  • 5
  • 4
  • 4
  • 4
  • 4
  • 4
  • 4
  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
21

Beyul Khumbu: Sherpa Constructions of a Sacred Landscape

Skog, Lindsay Ann 01 January 2010 (has links)
Khumbu, part of Sagarmatha (Mt. Everest) National Park in eastern Nepal and an UNESCO World Heritage site, is home to the Sherpa people, ethnic Tibetan Buddhists who migrated to the region more than 500 years ago. Sherpas animate the landscape with localized water, tree, rock, and land spirits, identify sacred mountains, mainly associated with the Bönpo and Tibetan yullha traditions, and some view the landscape as a beyul, a sacred place and hidden valley protecting Buddhist people and beliefs in times of turmoil and need. These beliefs protect the natural environment through religious practices and taboos against environmentally harmful behaviors and activities. Associated ritual practice, perceptions, and mythology encode Sherpa culture and beliefs in the landscape. This research contributes to discussions of place, sacred landscapes, and conservation by documenting older Sherpa residents’ constructions of Khumbu as a sacred landscape in two Khumbu villages. Interviews and participant observations reveal a socially constructed sacred landscape expressing a distinct Khumbu Sherpa identity.
22

Utvärdering av kvalité och dess behov inom förprovtryck

Bergander, Henrik January 2003 (has links)
It always has been a need for the abiltiy to create color proofs. When an error occurs late in the production process, itis allways complicated and difficult to correct the error. In this project, digital proofs been made and discussions havebeen held with several people in the printing industry, in order to examine how well excisting digital proofs, meet thedemand of the market. And how close the digital proofs can come to the actual printsheat from the press. The study hasbeen shown that the one thing that has had the most influence on the outcome for the quality of a digital proof, is theprintshop operator’s knowledge about color management and proofing systems. Many advertising agencies in the graphicindustry think rasterised proofs are not necessesary and expensive. Therefor they prefer a cheaper alternative, whichdoesn’t show colors as well as the rasterised proof, but well enough to be content with it. There are a good awarenessconcerning lack of communication between printshop, reproduction and advertising agency. Advertising agencies thinkthat printshop rarely listen to what they have to say, while the printshop think that the advertising agency doesn’t understandwhat they are trying to tell them. The outcome of the printed proofs in this study can’t be representive for howgood digital proofs are conducted in regular basis in the industry. The divergence between the print press sheat and thedigital proof that was made was bigger than expected. This shows that implementation of ICC profiles in a color managementflow, not alone is the answer to making perfect digital proofs. There are so many other issues that has to be examined,like color management software, measure tools and correct color management module. In order to make a perfectproof, you have to look at the whole picture. In the end, the human eye finally has the last word on wheather theproof is good or not.
23

Mesure de la section efficace différentielle de production du boson Z se désintégrant en paires électron-position, dans l'expérience ATLAS

Doan, Thi Kieu Oanh 28 November 2012 (has links) (PDF)
La première mesure du spectre en phi*_eta du boson Z à 7 TeV a été réalisée dans cette thèse. Cette variable permet de sonder la dynamique de production des Z de façon fine. L'échantillon complet des données enregistrées par ATLAS en 2011 a été utilisé ce qui correspond à 4.7/fb de luminosité intégrée. Les résultats de cette mesure sont publiés dans la Ref. [18] fondé sur la note interne Ref. [69]. La section efficace différentielle de Z->ee en fonction phi*_eta a été mesurée et comparée aux calculs perturbatifs à ordre fixé, avec/sans resommation pour la région des petits phi*_eta. Le code RESBOS fournit la meilleure description des données, cependant il est incapable de reproduire, à mieux de 4%, la forme détaillée de la section efficace mesurée. La section efficace différentielle a également été comparée aux prédictions de différents générateurs Monte Carlo interfacés avec un algorithme de parton shower. Les meilleures descriptions du spectre en phi*_eta mesuré sont données par les générateurs SHERPA et POWHEG+PYTHIA8. La mesure précise de la section efficace différentielle en phi*_eta fournit des informations précieuses pour l'ajustement des codes Monte Carlo. La précision expérimentale typique de cette mesure (~0.5%) est dix fois meilleure que la précision des calculs théoriques et elle est donc aussi précieuse pour contraindre la théorie. La mesure du spectre en ptZ a également été faite pour quantifier l'incertitude systématique de cette mesure en utilisant la grande statistique de l'échantillon de données. Cela permet de comparer deux mesures qui traitent de l'impulsion transverse du boson Z. Dans la plupart du domaine en phi*_eta l'incertitude systématique de la mesure de ptZ est deux fois plus grande que celle de la mesure de phi*_eta. Cette comparaison confirme l'intérêt de la variable phi*_eta. Les résultats présentés dans cette thèse ont beaucoup d'implications pour les études futures. Ajustant les générateurs Monte Carlo en utilisant les résultats de la mesure précise du spectre en phi*_eta minimisera l'incertitude sur leurs paramètres. Une mesure de la section efficace doublement différentielle en ptZ et phi*_eta est intéressante pour mieux comprendre la corrélation entre ces deux variables. La mesure précise du spectre en ptZ utilisant la variable phi*_eta peut être appliquée au spectre en ptW et on sait que des mesures plus fines du ptW sont importante pour une détermination précise de la masse du boson W. De plus, une compréhension précise du spectre en ptZ est importante pour comprendre les propriétés cinématiques de la production du boson de Higgs.
24

Open Access an der Technischen Universität Chemnitz

Thümer, Ingrid 25 October 2006 (has links)
Mit der Sonderausgabe des Newsletters 2/2006 möchte die Universitätsbibliothek ergänzend zum Rundschreiben des Rektors 02/2006 den Angehörigen der TU Chemnitz weitere Informationen zum Thema Open Access (OA) geben. Die Universitätsbibliothek begrüßt den Beschluß von Rektorat und Senat zur Unterstützung von Open Acces an der TU Chemnitz mit dem Wortlaut - Rektorat und Senat der TU Chemnitz fordern die Autoren der Universität nachdrücklich auf, ihre wissenschaftlichen Publikationen als Pre- oder Postprintversion, soweit rechtliche Bedenken der Verlage nicht entgegenstehen, auf dem Publikationsserver MONARCH der TU Chemnitz abzulegen. - Rektorat und Senat ermutigen die Wissenschaftler der TU Chemnitz, in bestehenden Open-Access-Zeitschriften zu publizieren. Gerade die Bibliothek der TU Chemnitz als Dienstleister für Wissenschaftler und Studierende hat die Auswirkungen der Zeitschriftenkrise bitter zu spüren bekommen. Eine drastische Reduzierung des Zeitschriftenbestandes seit Mitte der 90er Jahre ist die Folge. Schon lange beklagen die Wissenschaftler diese Situation. Die Universitätsbibliothek ist der Auffassung, dass langfristig und durch eine weltweite Unterstützung von Open Access diese Entwicklung korrigiert und die Krise im System der wissenschaftlichen Kommunikation überwunden werden kann. Die Etablierung des "Prinzips des offenen Zugangs" setzt jedoch die aktive Beteiligung jedes einzelnen Produzenten von wissenschaftlicher Information voraus. Entscheidend für die erfolgreiche Umsetzung der geplanten Open Access Aktivitäten an der TU Chemnitz ist die Akzeptanz unter den Wissenschaftlern und vor allem deren aktive Unterstützung. / This is a special issue of the library's newsletter. In addition to the rector-circular 02/2006 we would like to give you further information about open access publishing at our university. The library welcomes the joint resolution recently made by the university's rectorate and its senate to support open access publishing at Chemnitz University of Technology. - Rectorate and Senate of Chemnitz University of Technology invite the authors to publish their scientific works as pre- or postprintversion in MONARCH, under attention of the copyright. - Rectorate and Senate encourage the scientists to publish in open access journals. The library as a service provider for scientists and students is confronted with the effects of journal crisis. A dramatically reduction of acquired journal titles is the result. The university library is in the conviction that a long-term and world-wide support of Open Access can corrected and negotiate this development. Therefore is the activity of each individual producer of scientific information important. The acceptance and assistance from our authors is the base for transposition Open Access to the Chemnitz University of Technology.
25

Open Access an der Technischen Universität Chemnitz

Thümer, Ingrid 25 October 2006 (has links)
Mit der Sonderausgabe des Newsletters 2/2006 möchte die Universitätsbibliothek ergänzend zum Rundschreiben des Rektors 02/2006 den Angehörigen der TU Chemnitz weitere Informationen zum Thema Open Access (OA) geben. Die Universitätsbibliothek begrüßt den Beschluß von Rektorat und Senat zur Unterstützung von Open Acces an der TU Chemnitz mit dem Wortlaut - Rektorat und Senat der TU Chemnitz fordern die Autoren der Universität nachdrücklich auf, ihre wissenschaftlichen Publikationen als Pre- oder Postprintversion, soweit rechtliche Bedenken der Verlage nicht entgegenstehen, auf dem Publikationsserver MONARCH der TU Chemnitz abzulegen. - Rektorat und Senat ermutigen die Wissenschaftler der TU Chemnitz, in bestehenden Open-Access-Zeitschriften zu publizieren. Gerade die Bibliothek der TU Chemnitz als Dienstleister für Wissenschaftler und Studierende hat die Auswirkungen der Zeitschriftenkrise bitter zu spüren bekommen. Eine drastische Reduzierung des Zeitschriftenbestandes seit Mitte der 90er Jahre ist die Folge. Schon lange beklagen die Wissenschaftler diese Situation. Die Universitätsbibliothek ist der Auffassung, dass langfristig und durch eine weltweite Unterstützung von Open Access diese Entwicklung korrigiert und die Krise im System der wissenschaftlichen Kommunikation überwunden werden kann. Die Etablierung des "Prinzips des offenen Zugangs" setzt jedoch die aktive Beteiligung jedes einzelnen Produzenten von wissenschaftlicher Information voraus. Entscheidend für die erfolgreiche Umsetzung der geplanten Open Access Aktivitäten an der TU Chemnitz ist die Akzeptanz unter den Wissenschaftlern und vor allem deren aktive Unterstützung. / This is a special issue of the library's newsletter. In addition to the rector-circular 02/2006 we would like to give you further information about open access publishing at our university. The library welcomes the joint resolution recently made by the university's rectorate and its senate to support open access publishing at Chemnitz University of Technology. - Rectorate and Senate of Chemnitz University of Technology invite the authors to publish their scientific works as pre- or postprintversion in MONARCH, under attention of the copyright. - Rectorate and Senate encourage the scientists to publish in open access journals. The library as a service provider for scientists and students is confronted with the effects of journal crisis. A dramatically reduction of acquired journal titles is the result. The university library is in the conviction that a long-term and world-wide support of Open Access can corrected and negotiate this development. Therefore is the activity of each individual producer of scientific information important. The acceptance and assistance from our authors is the base for transposition Open Access to the Chemnitz University of Technology.
26

Mesure de la section efficace différentielle de production du boson Z se désintégrant en paires électron-position, dans l'expérience ATLAS / Measurement of the differential cross section of the production Z boson decaying into electron-positron pairs in the ATLAS experiment

Doan, Thi Kieu Oanh 28 November 2012 (has links)
La première mesure du spectre en phi*_eta du boson Z à 7 TeV a été réalisée dans cette thèse. Cette variable permet de sonder la dynamique de production des Z de façon fine. L’échantillon complet des données enregistrées par ATLAS en 2011 a été utilisé ce qui correspond à 4.7/fb de luminosité intégrée. Les résultats de cette mesure sont publiés dans la Ref. [18] fondé sur la note interne Ref. [69]. La section efficace différentielle de Z->ee en fonction phi*_eta a été mesurée et comparée aux calculs perturbatifs à ordre fixé, avec/sans resommation pour la région des petits phi*_eta. Le code RESBOS fournit la meilleure description des données, cependant il est incapable de reproduire, à mieux de 4%, la forme détaillée de la section efficace mesurée. La section efficace différentielle a également été comparée aux prédictions de différents générateurs Monte Carlo interfacés avec un algorithme de parton shower. Les meilleures descriptions du spectre en phi*_eta mesuré sont données par les générateurs SHERPA et POWHEG+PYTHIA8. La mesure précise de la section efficace différentielle en phi*_eta fournit des informations précieuses pour l’ajustement des codes Monte Carlo. La précision expérimentale typique de cette mesure (~0.5%) est dix fois meilleure que la précision des calculs théoriques et elle est donc aussi précieuse pour contraindre la théorie. La mesure du spectre en ptZ a également été faite pour quantifier l’incertitude systématique de cette mesure en utilisant la grande statistique de l’échantillon de données. Cela permet de comparer deux mesures qui traitent de l’impulsion transverse du boson Z. Dans la plupart du domaine en phi*_eta l’incertitude systématique de la mesure de ptZ est deux fois plus grande que celle de la mesure de phi*_eta. Cette comparaison confirme l’intérêt de la variable phi*_eta. Les résultats présentés dans cette thèse ont beaucoup d’implications pour les études futures. Ajustant les générateurs Monte Carlo en utilisant les résultats de la mesure précise du spectre en phi*_eta minimisera l’incertitude sur leurs paramètres. Une mesure de la section efficace doublement différentielle en ptZ et phi*_eta est intéressante pour mieux comprendre la corrélation entre ces deux variables. La mesure précise du spectre en ptZ utilisant la variable phi*_eta peut être appliquée au spectre en ptW et on sait que des mesures plus fines du ptW sont importante pour une détermination précise de la masse du boson W. De plus, une compréhension précise du spectre en ptZ est importante pour comprendre les propriétés cinématiques de la production du boson de Higgs. / The first measurement of the phi*_eta spectrum of Z bosons at 7 TeV of pp collisions has been studied in this thesis, which is an alternative way to probe the transverse momentum of Z bosons. The full data sample recorded by the ATLAS detector during 2011 run of the LHC was used, which corresponds with 4.7/fb integrated luminosity. The results of this measurement were reported in Ref. [18] supported by the internal note in Ref. [69]. The differential cross section of Z->ee as a function of phi*_eta has been measured and compared to fixed order perturbative QCD calculations with/without a resummation for the low phi*_eta region. Calculations using RESBOS provide the best descriptions of the data. However, they are unable to reproduce the detailed shape of the measured cross section to better than 4%. The differential cross section was also compared to predictions from different Monte Carlo generators interfaced to a parton shower algorithm. The best descriptions of the measured phi*_eta spectrum are provided by SHERPA and POWHEG+PYTHIA8 Monte Carlo event generators. The precise measurement of the differential cross section as a function of phi*_eta provides valuable information for the tuning of MC generators. The typical experimental precision of this measurement (~0.5%) is ten times better than the typical theoretical precision and therefore is valuable to constrain the theoretical predictions further. The ptZ measurement has been also studied to quantify the systematic uncertainty of this measurement using the high statistic data sample. This allows to compare two measurements which both address the physics issues of the Z transverse momentum. In most of the phi*_eta range, the systematic uncertainty of the ptZ measurement is two times larger than the one of the phi*_eta measurement. This comparison confirms the interest for the phi*_eta variable. The measurements presented in this thesis has many implications for future studies. Tuning MC generators using the result of the precise measurement of the phi*_eta spectrum will minimize the uncertainty on the tuned parameters. A double differential cross section measurement as a function of ptZ and phi*_eta is interesting to understand the correlation between ptZ and phi*_eta variables. The precise measurement of the ptZ spectrum using the new variable phi*_eta can be applied to ptZ. More precise measurement of ptZ are important to obtain precise measurements of the W mass. In addition, a precise understanding of the ptZ spectrum is important to understand kinematic properties of Higgs boson production.
27

Probing Electroweak Gauge Boson Scattering with the ATLAS Detector at the Large Hadron Collider

Anger, Philipp 07 October 2014 (has links) (PDF)
Electroweak gauge bosons as central components of the Standard Model of particle physics are well understood theoretically and have been studied with high precision at past and present collider experiments. The electroweak theory predicts the existence of a scattering process of these particles consisting of contributions from triple and quartic bosonic couplings as well as Higgs boson mediated interactions. These contributions are not separable in a gauge invariant way and are only unitarized in the case of a Higgs boson as it is described by the Standard Model. The process is tied to the electroweak symmetry breaking which introduces the longitudinal modes for the massive electroweak gauge bosons. A study of this interaction is also a direct verification of the local gauge symmetry as one of the fundamental axioms of the Standard Model. With the start of the Large Hadron Collider and after collecting proton-proton collision data with an integrated luminosity of 20.3/fb at a center-of-mass energy of 8 TeV with the ATLAS detector, first-ever evidence for this process could be achieved in the context of this work. A study of leptonically decaying WWjj, same-electric-charge diboson production in association with two jets resulted in an observation of the electroweak WWjj production with same electric charge of the W bosons, inseparably comprising WW->WW electroweak gauge boson scattering contributions, with a significance of 3.6 standard deviations. The measured production cross section is in agreement with the Standard Model prediction. In the course of a study for leptonically decaying WZ productions, methods for background estimation, the extraction of systematic uncertainties and cross section measurements were developed. They were extended and applied to the WZjj final state whereof the purely electroweakly mediated contribution is intrinsically tied to the scattering of all Standard Model electroweak gauge bosons: Wγ->WZ and WZ->WZ. Three charged leptons and a neutrino from the decay of the final state bosons allow inferences about the scattering process. A distinct signature is provided by the two accompanying tagging jets as remnants of the incoming quarks radiating the initial electroweak gauge bosons. The cross section of the electroweak WZjj production was measured to σ(fiducial, observed) = (0.63 +0.32 -0.28 (stat.) +0.41 -0.24 (syst.)) fb and was found to be consistent with the Standard Model prediction at next-to-leading order in perturbative quantum chromodynamics, σ(fiducial, theory) = (0.31 +0.03 -0.05) fb. Unfolded differential cross sections of kinematic variables sensitive to models of new physics were derived. Anomalous quartic electroweak gauge couplings are introduced as dimensionless coupling parameters of additional operators within an effective field theory approach. Constraints on the parameters of operators with dimension eight were set employing a unitarization prescription based on form factors.
28

Probing Electroweak Gauge Boson Scattering with the ATLAS Detector at the Large Hadron Collider

Anger, Philipp 01 September 2014 (has links)
Electroweak gauge bosons as central components of the Standard Model of particle physics are well understood theoretically and have been studied with high precision at past and present collider experiments. The electroweak theory predicts the existence of a scattering process of these particles consisting of contributions from triple and quartic bosonic couplings as well as Higgs boson mediated interactions. These contributions are not separable in a gauge invariant way and are only unitarized in the case of a Higgs boson as it is described by the Standard Model. The process is tied to the electroweak symmetry breaking which introduces the longitudinal modes for the massive electroweak gauge bosons. A study of this interaction is also a direct verification of the local gauge symmetry as one of the fundamental axioms of the Standard Model. With the start of the Large Hadron Collider and after collecting proton-proton collision data with an integrated luminosity of 20.3/fb at a center-of-mass energy of 8 TeV with the ATLAS detector, first-ever evidence for this process could be achieved in the context of this work. A study of leptonically decaying WWjj, same-electric-charge diboson production in association with two jets resulted in an observation of the electroweak WWjj production with same electric charge of the W bosons, inseparably comprising WW->WW electroweak gauge boson scattering contributions, with a significance of 3.6 standard deviations. The measured production cross section is in agreement with the Standard Model prediction. In the course of a study for leptonically decaying WZ productions, methods for background estimation, the extraction of systematic uncertainties and cross section measurements were developed. They were extended and applied to the WZjj final state whereof the purely electroweakly mediated contribution is intrinsically tied to the scattering of all Standard Model electroweak gauge bosons: Wγ->WZ and WZ->WZ. Three charged leptons and a neutrino from the decay of the final state bosons allow inferences about the scattering process. A distinct signature is provided by the two accompanying tagging jets as remnants of the incoming quarks radiating the initial electroweak gauge bosons. The cross section of the electroweak WZjj production was measured to σ(fiducial, observed) = (0.63 +0.32 -0.28 (stat.) +0.41 -0.24 (syst.)) fb and was found to be consistent with the Standard Model prediction at next-to-leading order in perturbative quantum chromodynamics, σ(fiducial, theory) = (0.31 +0.03 -0.05) fb. Unfolded differential cross sections of kinematic variables sensitive to models of new physics were derived. Anomalous quartic electroweak gauge couplings are introduced as dimensionless coupling parameters of additional operators within an effective field theory approach. Constraints on the parameters of operators with dimension eight were set employing a unitarization prescription based on form factors.
29

Vivre l'Éverest : la coproduction des corps, du paysage et de l'espace propre au Khumbu népalais

Paquet, Pierre-Alexandre 18 April 2018 (has links)
Ce mémoire porte sur la production des corps, du paysage et de l’espace dans le Khumbu népalais, région mieux connue par les touristes nombreux qui s’y rendent sous le nom de région de l’Everest et où les Sherpas ont établi leur résidence depuis près de cinq siècles. L’analyse qui étaye cette étude puise conceptuellement dans le champ de l’anthropologie de l’environnement. Si d’un coté le paysage du Khumbu témoigne de la riche texture des pratiques traditionnelles des Sherpas, d’un autre côté le développement actuel des moyens touristiques au nom du dyptique de la conservation et du développement multiplie les agents responsables de sa production et agrège le Khumbu dans un espace balayé par le capitalisme. Ce mémoire témoigne des effets de la respatialisation du Khumbu sur la vie de ses habitants et sur leur environnement. La gestion des ressources et la propriété du sol sont des thèmes centraux à l’argumentaire. / This thesis scrutinizes the production of body, landscape, and space in the Khumbu region of Nepal, better known internationally as the Everest region, where the Sherpas people have established themselves for nearly five centuries. The analysis underpinning this study draws its concepts from the field of the anthropology of the environment. If on the one hand the Khumbu landscape mirrors the rich texture of traditional Sherpa practices, on the other hand the current development of touristic means of production and the engagement of both conservation and development initiatives multiply the total numbers of social agents accountable for its production and aggregate the Khumbu in a space swept by the capitalist mode of production. This thesis demonstrates the impacts of the respatialisation of the Khumbu on the lives of its inhabitants and on their environment. Moreover, natural resource management practices and land ownership count among the central themes in the arguments.

Page generated in 0.0279 seconds