Tesis sobre el tema "Fat spectrum"
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An, Li. "Water-fat imaging and general chemical shift imaging with spectrum modeling". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape9/PQDD_0032/NQ38848.pdf.
Texto completoDaudé, Pierre. "Quantification du tissu adipeux épicardique à haut champ par IRM-Dixon, pour le phénotypage de la cardiomyopathie diabétique". Electronic Thesis or Diss., Aix-Marseille, 2022. http://www.theses.fr/2022AIXM0333.
Texto completoImproving the management of cardiac complications in metabolic diseases, obesity and diabetes, is a major challenge for our society. The measurement of epicardial adipose tissue (EAT), a fat depot attached to the heart, is an emerging and promising diagnosis to identify patients at risk. We developed the automation of this measurement on routine MRI images by deep learning. Then, an innovative MRI technique was proposed to measure and characterize the EAT in 3D, combining: a free-breathing acquisition, an image reconstruction robust to cardio-respiratory motion and MRI imperfections, an optimized and validated fat characterization algorithm and the knowledge of the composition of ex-vivo EAT samples. Together, this allows for in vivo, non-invasive characterization of EAT, a novel diagnosis for cardiometabolic risk
Kharroubi, Hassane. "Étude du pouvoir réflecteur de monocristaux uniaxes et biaxes dans l'infrarouge lointain". Nancy 1, 1994. http://www.theses.fr/1994NAN10108.
Texto completoCheraghi, Parisa. "Fast and accurate spectrum sensing low signal noise ratio environment". Thesis, University of Surrey, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.581799.
Texto completoAbdel-Rahman, Mohammad Jamal. "Robust Cognitive Algorithms For Fast-Varying Spectrum-Agile Wireless Networks". Diss., The University of Arizona, 2014. http://hdl.handle.net/10150/338872.
Texto completoLi, King Fai. "Ultra-fast spectroscopy investigation on organic molecules two photon absorption". HKBU Institutional Repository, 2008. http://repository.hkbu.edu.hk/etd_ra/911.
Texto completoBo, Zhang, Ren Yixun, Yang Dongkai y Zhang Qishan. "FAST ACQUISITION ALGORITHM FOR HYBRID DS/FH RECEIVER". International Foundation for Telemetering, 2007. http://hdl.handle.net/10150/604569.
Texto completoThis paper introduced a fast scanning and waiting acquisition method for a DS/FH receiver used in the telemetry field. Mathematic model of the hybrid DS/FH system’s acquisition process is given and discussed. The average acquisition time expression using this method and generalized average acquisition time formula is derived also. The validity of the proposed algorithm is verified after simulation. In the circumstances of Additive Gauss White Noise for the channel, simulation result at Ec/N0= -15dB shows that the average acquisition time is decreased almost 4 times than that of waiting and searching method.
Emmett, John Carter Alfred. "A standard neutron spectrum source of application to fast reactor physics". Thesis, Imperial College London, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.312126.
Texto completoJian-zhong, Qi, Gong Yan y Song Peng. "Realization of Fast Acquisition for Spread Spectrum Signal Based on FFT". International Foundation for Telemetering, 2011. http://hdl.handle.net/10150/595763.
Texto completoAcquisition based on Fast Fourier Transform (FFT) can acquire Pseudo-random code phase quickly and improve the performance of the satellite navigation receivers. In the paper Real-time receiver adopts the FPGA to realize the function of FFT and uses DSP processor to control the implementation process of Acquisition. For increasing the sensitivity of Acquisition incoherent accumulation were used in the process. Also, in the paper we have discussed the process method for decreasing the negative influence of signal power changes and carrier's Doppler frequency.
Rosenthal, Glenn y Thomas Salley. "USING THE FFT FOR DSP SPECTRUM ANALYSIS: A TELEMETRY ENGINEERING APPROACH". International Foundation for Telemetering, 1990. http://hdl.handle.net/10150/613797.
Texto completoThe Fast Fourier Transform (FFT) converts digitally sampled time domain data into the frequency domain. This paper will provide an advanced introduction for the telemetry engineer to basic FFT theory and then present and explain the different user preprocessing options that are available when using the FFT. These options include: using windowing functions, “zero filling” for frequency data interpolation, and setting the frequency resolution of the FFT resultant spectrum,
Benison, Benjamin David. "Receiver structures for a fast-frequency-hopped spread spectrum mobile communications system". Thesis, University of Canterbury. Electrical and Electronic Engineering, 1999. http://hdl.handle.net/10092/5961.
Texto completoScaife, Bradley J. "DOPPLER SHIFTED SPREAD SPECTRUM CARRIER RECOVERY USING REAL-TIME DSP TECHNIQUES". International Foundation for Telemetering, 1998. http://hdl.handle.net/10150/607365.
Texto completoIn any satellite communication, the Doppler shift associated with the satellite’s position and velocity must be calculated in order to determine the carrier frequency. If the satellite state vector is unknown then some estimate must be formed of the Doppler-shifted carrier frequency. One elementary technique is to examine the signal spectrum and base the estimate on the dominant spectral component. If, however, the carrier is spread (as in most satellite communications) this technique may fail unless the chip rate-to-data rate ratio (processing gain) associated with the carrier is small. In this case, there may be enough spectral energy to allow peak detection against a noise background. In this paper, we present a method to estimate the frequency (without knowledge of the Doppler shift) of a spread-spectrum carrier assuming a small processing gain and binary-phase shift keying (BPSK) modulation. Our method relies on a simple, averaged discrete Fourier transform along with peak detection. We provide simulation results indicating the accuracy of this method. In addition, we will describe an all-digital hardware design based around a Motorola DSP56303 and high-speed A/D which implements this technique in real-time. The hardware design is to be used in NMSU’s implementation of NASA’s demand assignment, multiple access (DAMA) service.
Hietanen, Jorma. "Investigations on far infrared spectra of acetylenes". Oulu : University of Oulu, 1986. http://catalog.hathitrust.org/api/volumes/oclc/15356036.html.
Texto completoWellard, Stanley James. "Tropospheric Spectrum Estimations Comparing Maximum Likelihood with Expectation Maximization Solutions and Fast Fourier Transforms". DigitalCommons@USU, 2007. https://digitalcommons.usu.edu/etd/264.
Texto completoFabre, David H. "Parameterized Spectral Bathymetric Roughness Using the Nonequispaced Fast Fourier Transform". ScholarWorks@UNO, 2015. http://scholarworks.uno.edu/td/2070.
Texto completoMagnani, Federico. "Analysis of aircraft cirrus clouds spectral measurements". Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2019.
Buscar texto completoBasden, Alastair Graham. "A fast spectro-interferometric sensor for the COAST". Thesis, University of Cambridge, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.616221.
Texto completoWishnow, Edward Hyman. "Far-infrared absorption by liquid nitrogen and liquid oxygen". Thesis, University of British Columbia, 1985. http://hdl.handle.net/2429/25072.
Texto completoScience, Faculty of
Physics and Astronomy, Department of
Graduate
Thibodeau, Brian Michael. "A Framework for Cooperative Wideband Spectrum Sensing Using the Robust Fast Fourier Aliasing-based Sparse Transform". Master's thesis, Temple University Libraries, 2016. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/389212.
Texto completoM.S.E.E.
This research considers the problem of cooperatively identifying the active bands in a wideband spectrum using the sparse Fast Fourier Transform (sFFT). Existing research has focused primarily on Compressed Sensing (CS) and Multi-Coset (MC) sampling, but recent developments in the sFFT have shown that a sparsely occupied spectrum can be efficiently reconstructed using multiple co-prime analog-to-digital converters (ADC) that sample below the Nyquist rate. Specifically, this research utilizes the Robust Fast Fourier Aliasing-based Sparse Transform (R-FFAST) and extends this algorithm for use in cooperative wideband spectrum sensing (CWSS). Unlike previous approaches that implement the sFFT for spectrum sensing, the R-FFAST framework was developed and analyzed using the mutual coherence and the restricted isometry property (RIP) from CS theory. This leads to reliable support estimation in the presence of additive white Gaussian noise (AWGN) while mitigating the computational complexity of CS reconstruction algorithms. This research makes the following contributions. First, this research extends the signal model from single tones to multi-band signals with clustered support. Second, it shows that each stage in the R-FFAST front-end can be decomposed into individual nodes that form a fully distributed cooperative network. Lastly, this research empirically develops a constant false alarm rate (CFAR) detector that is used to identify the active frequency bins during the reconstruction process. The primary result of this research is showing that reliable spectrum detection is only possible when the average sampling rate of the cooperative network is greater than or equal to the sparsity of the spectrum. Simulation results are provided to demonstrate the effectiveness of the proposed framework and validate the findings of this research.
Temple University--Theses
Poirier, Freddy. "Beam-diagnostic laser-wire study and fast luminosity spectrum measurement at the International Linear Collider". Thesis, Royal Holloway, University of London, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.421865.
Texto completoWillig, Judith A. (Judith Ann) 1953. "Paleo-archaic broad spectrum adaptations at the Pleistocene-Holocene boundary in Far Western North America". Thesis, University of Oregon, 1989. http://hdl.handle.net/1794/9220.
Texto completoWestern Clovis and Western Stemmed cultural traditions, archaeologically indexed by fluted (Clovis) and stemmed projectile point complexes, represent the earliest human occupation documented in Far Western North America. The temporal closeness of Western Clovis, dated roughly from 11,500 to 11,000 B.P., to Western Stemmed complexes known as early as 11,140 to 10,800 B.P., has generated debate over the age and historical relationship of these cultures. The frequent co-occurrence of fluted and stemmed points along the lowest strandlines in pluvial lake basins has also led scholars to hypothesize an early development of the characteristically "Archaic" lake-marsh adaptations known from later periods. Geoarchaeological research in the northern Alkali Lake Basin of south-central Oregon has addressed these issues of cultural chronology and economy by seeking data to test a paleoecological model of human land use in the basin from 11,500 to 7,000 B.P. The model posits a late Pleistocene Western Clovis settlement oriented to a small, shallow lake or pond, followed by an early Holocene Western Stemmed occupation around a much larger lake and marsh fringe. Data gathered through basin-wide site survey, stratigraphic studies, and high-resolution mapping of lake features and artifacts, support the model as proposed, and reveal a settlement pattern indicative of a "tethered" focus on local lake-marsh habitats. Research also verifies the horizontal separation of fluted and stemmed artifacts on different, sequent shorelines, indicating that Western Clovis occupation precedes Western Stemmed, although the two are close in time. Data from Alkali Basin, and elsewhere, support the notion that Far Western cultures developed broad-spectrum adaptations much earlier than was once thought. This implies that the foundations of the Western Archaic were already in place by 11,000 B.P. In keeping with the adaptive flexibility embodied within the Desert Culture concept, environmental data further suggest that this "paleo-Archaic" lifeway developed quickly, not gradually, in response to punctuated climatic change and the emerging mosaic of regional habitats which characterized the Pleistocene-Holocene boundary, at a time when the desert as we know it was just coming into being.
Adviser: Aikens, C. Melvin
Grasso, Giacomo <1980>. "Neutronics analyses for fast spectrum nuclear systems and scenario studies for advanced nuclear fuel cycles". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2010. http://amsdottorato.unibo.it/2812/1/grasso_giacomo_tesi.pdf.
Texto completoGrasso, Giacomo <1980>. "Neutronics analyses for fast spectrum nuclear systems and scenario studies for advanced nuclear fuel cycles". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2010. http://amsdottorato.unibo.it/2812/.
Texto completoLott, P. Aaron. "Fast solvers for models of fluid flow with spectral elements". College Park, Md.: University of Maryland, 2008. http://hdl.handle.net/1903/8743.
Texto completoThesis research directed by: Applied Mathematics & Statistics, and Scientific Computation Program. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
Lee, Sung-Ik. "Far-infrared absorption of small metallic particles /". The Ohio State University, 1985. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487261919113037.
Texto completoLeung, Cleo D. M. "Overtone Characterization of Garner Headjoints Using Spectrographic Analysis and Fast Fourier Transforms". University of Cincinnati / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1396523100.
Texto completoRynell, Anders. "An experimental and numerical study of an automotive cooling module". Doctoral thesis, KTH, Farkost och flyg, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-199285.
Texto completoJoel, Sandé. "Jodivi: An Application to Target Sound Sensitivity Features in People with Autism Spectrum Disorder". Thesis, Université d'Ottawa / University of Ottawa, 2017. http://hdl.handle.net/10393/36516.
Texto completoMartinazzo, Michele. "Cloud optical properties parameterizations for infrared high spectral resolution fast codes". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/21747/.
Texto completoFox, Cathryn. "Far-infrared spectral radiance studies : application to water vapour and cirrus". Thesis, Imperial College London, 2015. http://hdl.handle.net/10044/1/25752.
Texto completoAdamczyk, Aleksandra Katarzyna. "Analysis of the high-resolution ro-vibrational spectrum of DC3N in the far and mid infrared regions". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/21732/.
Texto completoWalsh, Jonathan A. (Jonathan Alan). "On-the-fly nuclear data processing methods for Monte Carlo simulations of intermediate and fast spectrum systems". Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/106700.
Texto completoThis electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (pages 203-212).
Computational methods for on-the-fly representation and processing of nuclear data within Monte Carlo neutron transport simulations of intermediate and fast spectrum systems are developed and implemented in a continuous-energy Monte Carlo code. First, a capability to compute temperature-dependent unresolved resonance region (URR) cross sections directly from zero-temperature average resonance parameters is presented. The use of this capability in benchmarking both evaluated and processed URR data is demonstrated. Results of this benchmarking lead to a partial resolution of a longstanding discrepancy between experiment and calculation results for a well-known fast critical assembly. Next, an on-the-fly probability table interpolation scheme for computing temperature-dependent URR cross sections is developed and used in analyses which show that interpolation on a relatively coarse temperature mesh (>100 K) can be used to reproduce results obtained with cross sections generated at an exact temperature. This enables the simulation of systems having detailed temperature distributions using probability table data which require significantly less memory than data generated on a fine temperature mesh. Additional methods for use in the investigation of two common approximations that are made in representing URR cross section data are developed. Namely, a multi-level URR cross section calculation capability is used to show that level-level interference effects in elastic scattering cross sections are negligible in many cases of interest. A capability to generate resonance structure in competitive reaction cross sections is used to show that neglecting cross section structure for reactions other than elastic scattering, capture, and fission can lead to non-negligible, unconservative biases (>100 pcm) in criticality safety calculations. The principal underlying assumption of the probability table method is also tested by comparing the results it yields with results that are averaged over many independent simulations, each using a single, independent realization of URR resonance parameters. Unknown URR resonance structure is observed to induce an uncertainty on the multiplication factor for intermediate and fast spectrum systems that is nearly an order of magnitude greater than that which is purely stochastic. This significantly increases the uncertainty to which results of simulations of those systems should be stated. Finally, a procedure for consistent, on-the-fly sampling of temperature-dependent neutron reaction kernels which requires no additional secondary distribution data is presented. It is used to show that Doppler effects may have only a small impact on elastic scattering secondary angular distributions at typical power reactor operating temperatures but can be appreciable at astrophysical temperatures.
by Jonathan A. Walsh.
Ph. D.
Seth, Ernest L. "FASPEC, a program to determine group constants for up to 47 groups in a fast neutron spectrum". Thesis, Virginia Tech, 1985. http://hdl.handle.net/10919/45665.
Texto completoIn reactor core design, a gap exists between the manual calculation of few-group constants and the many-group calculation, by large computer programs. A method is needed by which group constants may be calculated easily and quickly. The FASPEC program is designed to reduce the amount of manual calculation and to complement the large program by reducing the number of times the large program must be run to achieve desired results.
The program calculates group constants from 940 microgroups, collapsing to any user-specified number of macrogroups up to 47. FASPEC is based on group-averaged flux calculations by a solution of the Infinite medium neutron transport equation. Flux contributions from inelastic scatter are included while those from neutron upâ scatter are not. The energy spectrum considered is from 10 MeV to 0.625 eV. Required input is the atomic number density of each isotope, the number of macrogroups desired and the upper and lower microgroup numbers of each macrogroup. Input is facilitated by prompting in each case. Cross section look-up tables were provided by the Very Improved Monte Carlo code (VIM) for a mid-range Infinite hexagonal lattice. Self-shielding effects are included indirectly. A brief user's guide is provided.
Group constants calculated and stored for either terminal display or printed output are group number, lowest energy of the group, macroscopic removal cross section, macroscopic absorption cross section, diffusion coefficient, flux, macroscopic fission cross section, v, the average number of neutrons emitted per fission, and vΣf.
Master of Science
Lindbo, Dag. "Spectral Accuracy in Fast Ewald Methods and Topics in Fluid Interface Simulation". Doctoral thesis, KTH, Numerisk analys, NA, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-48805.
Texto completoQC 20111125
Skipper, Chris. "Fast spectral variability in the X-ray emission of accreting black holes". Thesis, University of Southampton, 2013. https://eprints.soton.ac.uk/360394/.
Texto completoCossich, Marcial de Farias William <1987>. "Analysis of far-infrared (FIR) high spectral resolution data for cloud studies". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amsdottorato.unibo.it/9487/1/Tesi_WilliamCossich.pdf.
Texto completoBekker, Scott Henry. "Continuous real-time recovery of optical spectral features distorted by fast-chirped readout". Thesis, Montana State University, 2006. http://etd.lib.montana.edu/etd/2006/bekker/BekkerS0506.pdf.
Texto completoCrumrine, Daiquirie. "Eye-gaze profiles of children with autism spectrum disorders in relation to fast-mapping and visual search abilities". Diss., Wichita State University, 2012. http://hdl.handle.net/10057/6095.
Texto completoThesis (Ph.D.)--Wichita State University, College of Health Professions, Dept. of Communication Sciences and Disorders
Scott, Ashley Anna. "Imaging genetics of frontostriatal function in autism spectrum disorders". Diss., Restricted to subscribing institutions, 2009. http://proquest.umi.com/pqdweb?did=1872142711&sid=8&Fmt=2&clientId=1564&RQT=309&VName=PQD.
Texto completoVan, Wyk BJ, Wyk MA Van y den Bergh F. Van. "A note on difference spectra for fast extraction of global image information". SAIEE Africa Research Journal, 2007. http://encore.tut.ac.za/iii/cpro/DigitalItemViewPage.external?sp=1001081.
Texto completoJuanola-Parramon, R. "A far-infrared spectro-spatial space interferometer : instrument simulator and testbed implementation". Thesis, University College London (University of London), 2014. http://discovery.ucl.ac.uk/1427371/.
Texto completoO'Rourke, Douglas James Peter. "Spectral modeling of dusty galaxies, and evolution of the far infrared-radio correlation". Thesis, University of Cambridge, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.610847.
Texto completoCARESTIA, MARIACHIARA. "Spectral analysis of biological agents to implement a tool for fast biological detection". Doctoral thesis, Università degli Studi di Roma "Tor Vergata", 2014. http://hdl.handle.net/2108/202303.
Texto completoSivijs, Andrew K. "The resort development spectrum (RDS) : case study application of the RDS for Cairns, Far North Queensland and Bali, Indonesia /". [St. Lucia, Qld.], 2004. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe18578.pdf.
Texto completoWilliams, Amie M. "Language development in preschool children with autism spectrum disorders investigating fast-mapping abilities and utilization of word learning constraints /". Thesis, [Tuscaloosa, Ala. : University of Alabama Libraries], 2009. http://purl.lib.ua.edu/52.
Texto completoJolma, Kalevi. "High resolution far infrared spectra of certain light linear three and four atomic molecules". Oulu : University of Oulu, 1985. http://catalog.hathitrust.org/api/volumes/oclc/15465428.html.
Texto completoWolf, Michael Christopher. "A novel broad-spectrum antiviral targeting entry of enveloped viruses". Diss., Restricted to subscribing institutions, 2009. http://proquest.umi.com/pqdweb?did=1971758861&sid=1&Fmt=2&clientId=1564&RQT=309&VName=PQD.
Texto completoLepage, Pierre. "Etude structurale de proteines lipophiles (proteolipides) du systeme nerveux central : utilisation de la spectrometrie de masse pour le sequencage de peptides". Université Louis Pasteur (Strasbourg) (1971-2008), 1987. http://www.theses.fr/1987STR13007.
Texto completoEriksson, Jacob. "Calculations of neutron energy spectra from fast ion reactions in tokamak fusion plasmas". Thesis, Uppsala University, Applied Nuclear Physics, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-120425.
Texto completoA MATLAB code for calculating neutron energy spectra from JET discharges was developed. The code uses the fuel ion distribution calculated by the computer code SELFO to generate the spectrum through a Monte-Carlo simulation. The calculated spectra were then compared against experimental results from the neutron spectrometer TOFOR. In the calculations, the exact orbits of the fuel ions are taken into account, in order to investigate what effects this has on the spectrum. The reason for this is that, for certain plasma heating scenarios, large populations of fast fuel ions are formed. These fast ions may have Larmor radii of the order of decimeters, which is comparable to the width of the sight line of TOFOR, and may therefore affect the recorded neutron spectrum. A JET discharge with both NBI and 3rd harmonic ICRF heating was analyzed. The results show that the details of the line of sight of the detector indeed affects the neutron spectrum. This effect is probably important for other diagnostics techniques, such as gamma-ray spectroscopy and neutral particle analysis, as well. Good agreement with TOFOR data is observed, but not for the exact same time slice of the discharge, which leaves some questions yet to be investigated.
Klenow, Bradley. "Finite and Spectral Element Methods for Modeling Far-Field Underwater Explosion Effects on Ships". Diss., Virginia Tech, 2009. http://hdl.handle.net/10919/37648.
Texto completoPh. D.