Дисертації з теми "Data lingo"
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Murinová, Michaela. "Porovnání systémů pro hodnocení efektivnosti pomocí DEA modelů." Master's thesis, Vysoká škola ekonomická v Praze, 2012. http://www.nusl.cz/ntk/nusl-150228.
Повний текст джерелаThrush, Samantha Elaine. "Fact Checking LIGO's Radiometer Code with Simulated LIGO Data." Ohio University Honors Tutorial College / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=ouhonors1428923532.
Повний текст джерелаFranco, Samuel. "Searching for long transient gravitational waves in the LIGO-Virgo data." Phd thesis, Université Paris Sud - Paris XI, 2014. http://tel.archives-ouvertes.fr/tel-01062708.
Повний текст джерелаBelahcene, Imène. "Searching for gravitational waves produced by cosmic strings in LIGO-Virgo data." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS406.
Повний текст джерелаThis thesis shows the results of the search for gravitational-wave signals produced by cosmic strings using the data from the first two observation runs of the second generation detectors Advanced LIGO and Advanced Virgo. Cosmic strings are one-dimensional topological defects created in the primordial Universe. These objects are predicted by many models of very high energy physics. The gravitationalwave signal emitted by cosmic strings is predicted by theory. A matched-filter analysis is used to search for the presence of a signal in Advanced LIGO and Advanced Virgo data. This technique is optimal if the detector noise is Gaussian and stationary, which is not the case. An essential part of the thesis work was to understand and reduce the background noise analysis. This work on data quality has increased the sensitivity of the search. Furthermore, we have shown that the search for transient signals of gravitational waves produced by cosmic strings is limited by the presence of a particular family of noises that mimic the predicted signal for cosmic strings. In the absence of detection, we have placed constraints on the parameters which characterize a cosmic string network for different theoretical models, in order to specify the conditions of their existence
Chatterji, Shourov Keith. "The search for gravitational wave bursts in data from the second LIGO science run." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/34388.
Повний текст джерелаIncludes bibliographical references (p. 279-293).
The network of detectors comprising the Laser Interferometer Gravitational-wave Observatory (LIGO) are among a new generation of detectors that seek to make the first direct observation of gravitational waves. While providing strong support for the General Theory of Relativity, such observations will also permit new tests of physical theory in regions of strong space-time curvature and high matter-energy density. However, the observed signals are expected to occur near the limit of detector sensitivity. The problem of identifying such small signals is the primary focus of this work. This work presents a novel method for the identification of astrophysically unmodeled bursts of gravitational radiation in data from networks of interferometric detectors. The method is based on the Q transform, a multiresolution time-frequency transform that efficiently targets waveforms within a finite region of time, frequency, and Q space. The method is also based on a modification of linear prediction that greatly simplifies the resulting statistical analysis by whitening interferometric detector data prior to Q transform analysis. Together, these techniques form the basis of a complete analysis pipeline that is equivalent to a template-based matched filter search for minimum uncertainty waveforms in the whitened data stream. This method is then applied to search for gravitational-wave bursts with duration less than 1 second and frequency content between 64 and 1024 Hz in coincident data from two detectors during second LIGO science run. Although no gravitational-wave bursts are identified,
(cont.) upper bounds are reported for the rate of gravitational-wave bursts as a function of signal strength for isotropic and galactic populations of sources with both abstract and astrophysically motivated waveform. The results indicate a maximum of 0.09 events per day at the 90% confidence level for bursts with characteristic strain amplitude in excess of 10-20 to 10-19 strain Hz-l/2 depending on waveform. A comparison with previous searches demonstrates that this search is one of the most sensitive to date for gravitational-wave bursts of unknown waveform, and is inconsistent with recent indications for an statistical excess of events by the ROG collaboration at above the 99% confidence level.
by Shourov Keith Chatterji.
Ph.D.
Was, Michal. "Searching for gravitational waves associated with gamma-ray bursts int 2009-2010 ligo-virgo data." Phd thesis, Université Paris Sud - Paris XI, 2011. http://tel.archives-ouvertes.fr/tel-00610302.
Повний текст джерелаIto, Masahiro. "Search for supernova induced gravitational wave bursts with optimal filter technique on LIGO science data /." view abstract or download file of text, 2006. http://proquest.umi.com/pqdweb?did=1188882241&sid=1&Fmt=2&clientId=11238&RQT=309&VName=PQD.
Повний текст джерелаTypescript. Includes vita and abstract. Includes bibliographical references (leaves 113-116). Also available for download via the World Wide Web; free to University of Oregon users.
Krupczak, Emmett E. E. "Detection of core-collapse supernovae through joint analysis of LIGO gravitational wave and KamLAND neutrino data." Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/105600.
Повний текст джерелаCataloged from PDF version of thesis.
Includes bibliographical references (pages 45-47).
Introduction: Core collapse supernova are one of the most intriguing astrophysical phenomena. The dying stage of a supergiant star, they occur when the star collapses into a protoneutron star, causing a shock wave and a gamma ray burst. High energy neutrinos are released in this process and offer the possibility of detecting these elusive cataclysms. The number of neutrinos emitted is large but at best only a few will be detected. With a multi-messenger search, we can combine the neutrino signal with another clue to the presence of a supernova: gravitational waves. During the proto-neutron star stage, a fast-rotating star can produce gravitational waves via its asymmetric and rapidly shifting mass. By combining the signals from neutrinos and gravitational waves, we can attempt to detect supernova signals that are too faint to detect alone. Joint searches have already been attempted by several neutrino experiments with high-energy thresholds, including ANTARES and IceCube. This thesis explores the possibility of a joint search with a new set of neutrino data. KamLAND (Kamioka Liquid scintillator Anti-Neutrino Detector) is a large particle detector located in Kamioka, Japan. KamLAND is well-shielded, with an low (~ 1 MeV) energy threshold and has more than ten years of data to explore, making it a good candidate for a joint search. A recent search of KamLAND's data for clustered events indicative of supernova found no clear clusters. A new search is needed to identify single-neutrino events that may have originated in supernovae. A joint search will help KamLAND more carefully examine the possible sources of its single-neutrino events. The gravitational wave data comes from LIGO (Laser Interferometer Gravitational wave Observatory). Located in Hanford, WA and Livingston, LA, LIGO consists of two four-kilometer interferometer arms. Analysis of LIGO data from 2005 to 2010 did not produce any clear gravitational wave events, leading to a need for a more sensitive search. A multimessenger search in conjunction with KamLAND provides this opportunity. We can examine both KamLAND and LIGO's data in order to search for possible supernova signals observed by both experiments. Because a joint data-sharing agreement has not been reached between KamLAND and LIGO, this thesis looks at the potential of a joint analysis and the opportunity for such a study to produce promising results.
by Emmett E.E. Krupczak.
S.B.
Frykholm, Ludvig, and Jacob Toresson. "Examining the concept of computer hubs as an approach to increase technological inclusion in rural areas in low-income countries : A Field Study in Linga Linga, Mozambique." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-281747.
Повний текст джерелаProjektet undersöker konceptet computer hubs och hur det kan användas som ett verktyg för att öka teknologisk inkludering på landsbygden i låginkomstländer. Konceptet utvärderades genom att undersöka tre faktorer: användaracceptansen för datorer, computer hubs finansiella hållbarhet och den faktiska användbarheten hos datorer. Studien genomfördes i Linga Linga, en by belägen i provinsen Morrumbene i södra Moçambique. Linga Linga kännetecknas av låg teknologisk inkludering och invånare med låga eller inga inkomster. Intervjuer, frågeformulär, seminarium och fokusgrupper genomfördes för att undersöka konceptens genomförbarhet. Studien indikerar att användaracceptansen hos datorer, mätt genom attityd gentemot datorer såväl som upplevd användbarhet och upplevd användarvänlighet för datorer, var tillräcklig för implementering. Studien visar även att den faktiska användbarheten hos datorer är tillräckligt hög för implementering samt att den snabbt kan förbättras trots lite eller ingen tidigare erfarenhet av datorer. Studien visar även att en implementering av computer hubs är ekonomiskt hållbar ur ett affärsperspektiv. Sammanfattningsvis kan implementeringen av computer hubs som koncept betraktas som ett hållbart tillvägagångssätt för att öka teknologisk inkludering i landsbygden i låginkomstländer.
Bouhou, Boutayeb. "Recherche conjointe d'ondes gravitationnelles et de neutrino cosmiques de haute énergie avec les détecteurs VIRGO-LIGO et ANTARES." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2012. http://tel.archives-ouvertes.fr/tel-00819985.
Повний текст джерелаHee, Sonke. "Computational Bayesian techniques applied to cosmology." Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/273346.
Повний текст джерелаBegum, Mumtaz. "The incidence, risk factors and implications of type 1 diabetes: whole-of-population linked-data study of children in South Australia born from 1999-2013." Thesis, 2020. http://hdl.handle.net/2440/128227.
Повний текст джерелаThesis (Ph.D.) -- University of Adelaide, School of Public Health, 2020
Summerscales, Tiffany Z. "Gravitational wave astronomy with LIGO from data to science /." 2006. http://etda.libraries.psu.edu/theses/approved/WorldWideIndex/ETD-1198/index.html.
Повний текст джерелаSachdev, Surabhi. "Searching for Gravitational Waves from Compact Binary Coalescences in Advanced LIGO Data." Thesis, 2019. https://thesis.library.caltech.edu/11491/14/Sachdev_Surabhi_2018.pdf.
Повний текст джерелаAdvanced LIGO's first observing run marked the birth of gravitational-wave astronomy through the first detection of gravitational waves from coalescing black holes-GW150914. Advanced LIGO's second and Advanced Virgo's first observing run marked the birth of multimessenger astronomy with first joint observations of gravitational and electromagnetic radiation associated with coalescing neutron stars-GW170817. The electromagnetic observations included detection of a burst of gamma rays produced by the merger, and a kilonova powered by the radioactive decay of r-process nuclei synthesized in the neutron star coalescence ejecta. Gravitational waves from compact binary coalescences carry fingerprints of the sources that generated them. Studying them allows us to test Einstein’s general relativity in the strongest regimes, where it has never been tested before, and study matter at densities beyond reach of the most powerful laboratories on our planet. Moreover, we can gain insight about the evolution of stars, galaxies and even the Universe as a whole by studying the merger rate of compact objects. Joint electromagnetic and gravitational-wave observations help develop our understanding of the physical processes that occur in such systems, and provide a new method of probing cosmological parameters.
GW170817 was detected by the GstLAL pipeline in low-latency making the extensive electromagnetic followup possible. The GstLAL pipeline is a matched filtering pipeline that uses compact binary coalescence waveform models to filter the data from gravitational-wave detectors in the time-domain. It can detect gravitational waves from coalescing compact binaries in near real time and provide point estimates for binary parameters. This thesis describes the methods, developments, and the results from the GstLAL pipeline over the course of the first two observing runs of Advanced LIGO, focusing on the contributions made by the author. We also present a study about the prospects of observing a cosmological stochastic background which is expected to be buried under the astrophysical background from the population of coalesceing compact binaries with third-generation gravitational-wave detectors.
Goggin, Lisa Maria. "A Search for Gravitational Waves from Perturbed Black Hole Ringdowns in LIGO Data." Thesis, 2008. https://thesis.library.caltech.edu/5195/1/Thesis0523.pdf.
Повний текст джерелаVaishnav, Birjoo Dilipkumar Shoemaker Deirdre M. "Gravitational waves from intermediate mass binary black holes first steps toward using numerical relativity waveforms for LIGO data analysis /." 2008. http://etda.libraries.psu.edu/theses/approved/WorldWideIndex/ETD-3154/index.html.
Повний текст джерелаRay, Pitambar Mohapatra Satyanarayan. "Searches for gravitational waves from binary black hole coalescences with ground-based laser interferometers across a wide parameter space." 2012. https://scholarworks.umass.edu/dissertations/AAI3545977.
Повний текст джерела(9731966), Dewen Shi. "Alternative Approaches for the Registration of Terrestrial Laser Scanners Data using Linear/Planar Features." Thesis, 2020.
Знайти повний текст джерелаStatic terrestrial laser scanners have been increasingly used in three-dimensional data acquisition since it can rapidly provide accurate measurements with high resolution. Several scans from multiple viewpoints are necessary to achieve complete coverage of the surveyed objects due to occlusion and large object size. Therefore, in order to reconstruct three-dimensional models of the objects, the task of registration is required to transform several individual scans into a common reference frame. This thesis introduces three alternative approaches for the coarse registration of two adjacent scans, namely, feature-based approach, pseudo-conjugate point-based method, and closed-form solution. In the feature-based approach, linear and planar features in the overlapping area of adjacent scans are selected as registration primitives. The pseudo-conjugate point-based method utilizes non-corresponding points along common linear and planar features to estimate transformation parameters. The pseudo-conjugate point-based method is simpler than the feature-based approach since the partial derivatives are easier to compute. In the closed-form solution, a rotation matrix is first estimated by using a unit quaternion, which is a concise description of the rotation. Afterward, the translation parameters are estimated with non-corresponding points along the linear or planar features by using the pseudo-conjugate point-based method. Alternative approaches for fitting a line or plane to data with errors in three-dimensional space are investigated.
Experiments are conducted using simulated and real datasets to verify the effectiveness of the introduced registration procedures and feature fitting approaches. The proposed two approaches of line fitting are tested with simulated datasets. The results suggest that these two approaches can produce identical line parameters and variance-covariance matrix. The three registration approaches are tested with both simulated and real datasets. In the simulated datasets, all three registration approaches produced equivalent transformation parameters using linear or planar features. The comparison between the simulated linear and planar features shows that both features can produce equivalent registration results. In the real datasets, the three registration approaches using the linear or planar features also produced equivalent results. In addition, the results using real data indicates that the registration approaches using planar features produced better results than the approaches using linear features. The experiments show that the pseudo-conjugate point-based approach is easier to implement than the feature-based approach. The pseudo-conjugate point-based method and feature-based approach are nonlinear, so an initial guess of transformation parameters is required in these two approaches. Compared to the nonlinear approaches, the closed-form solution is linear and hence it can achieve the registration of two adjacent scans without the requirement of any initial guess for transformation parameters. Therefore, the pseudo-conjugate point-based method and closed-form solution are the preferred approaches for coarse registration using linear or planar features. In real practice, the planar features would have a better preference when compared to linear features since the linear features are derived indirectly by the intersection of neighboring planar features. To get enough lines with different orientations, planes that are far apart from each other have to be extrapolated to derive lines.
Hodge, Kari Alison. "The Search for Gravitational Waves from the Coalescence of Black Hole Binary Systems in Data from the LIGO and Virgo Detectors. Or: A Dark Walk through a Random Forest." Thesis, 2014. https://thesis.library.caltech.edu/8463/1/khodge_thesis_20140530_Redacted.pdf.
Повний текст джерела