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Thematische Bibliographien / Snow particles / Dissertationen

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Dissertationen zum Thema „Snow particles“

Autor: Grafiati

Veröffentlicht am 29. Juni 2021

Zuletzt aktualisiert am 29. Juli 2025

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1

Axebrink, Emma. "Automatic Classification of Snow Particles." Thesis, Luleå tekniska universitet, Institutionen för system- och rymdteknik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-86017.

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The simplest form of a snow particle is a hexagonal prism which can grow into a stellar crystal by growing branches from the six corners of the prism. The snow particle is affected by the temperature and supersaturation in the air, giving its unique form. Manual classification of snow particles based on shape is tedious work. Convolutional Neural Network (CNN) can therefor be of great assistance and are common in automatic image processing. From a data set consisting of 3165 images sorted into 15 shape classes, a sub set of 2193 images and 7 classes was used. The selected classes had the highe

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2

Dave, Palak P. "A Quantitative Analysis of Shape Characteristics of Marine Snow Particles with Interactive Visualization: Validation of Assumptions in Coagulation Models." Scholar Commons, 2018. https://scholarcommons.usf.edu/etd/7279.

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The Deepwater Horizon oil spill that started on April 20, 2010, in the Gulf of Mexico was the largest marine oil spill in the history of the petroleum industry. There was an unexpected and prolonged sedimentation event of oil-associated marine snow to the seafloor due to the oil spill. The sedimentation event occurred because of the coagulation process among oil associated marine particles. Marine scientists are developing models for the coagulation process of marine particles and oil, in order to estimate the amount of oil that may reach the seaflo

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Tse, Ka-ki. "Multiple scattering of waves by dense random distributions of particles for applications in light scattering by noble metal nanoparticles and microwave scattering by terrestrial snow /." access full-text access abstract and table of contents, 2009. http://libweb.cityu.edu.hk/cgi-bin/ezdb/thesis.pl?phd-ee-b23750558f.pdf.

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Thesis (Ph.D.)--City University of Hong Kong, 2009.<br>"Submitted to Department of Electronic Engineering in partial fulfillment of the requirements for the degree of Doctor of Philosophy." Includes bibliographical references.

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Aguilar, Boris. "Experimental study and numerical modeling of accretion phenomena of snow particles at the origin of the formation of accretions on aeronautical structures or civil engineering." Electronic Thesis or Diss., Toulouse, ISAE, 2024. http://www.theses.fr/2024ESAE0003.

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Pour garantir la sécurité des vols dans des conditions de neige, les constructeurs d'aéronefs doivent démontrer que chaque moteur et son système d'admission d'air peuvent fonctionner sur toute la plage de puissance de vol dans des conditions de neigeuse. Cette étude fait partie d'un effort visant à développer des modèles pour l'accumulation de neige.Pour établir le cadre de départ de ce travail sur la modélisation du givrage de la neige, le chapitre 1 est consacré à une revue de la littérature organisée en trois parties. Dans la première partie, les différents processus de création de neige da

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5

Sobhani, Negin. "Applications, performance analysis, and optimization of weather and air quality models." Diss., University of Iowa, 2017. https://ir.uiowa.edu/etd/5996.

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Atmospheric particulate matter (PM) is linked to various adverse environmental and health impacts. PM in the atmosphere reduces visibility, alters precipitation patterns by acting as cloud condensation nuclei (CCN), and changes the Earth’s radiative balance by absorbing or scattering solar radiation in the atmosphere. The long-range transport of pollutants leads to increase in PM concentrations even in remote locations such as polar regions and mountain ranges. One significant effect of PM on the earth’s climate occurs while light absorbing PM, such as Black Carbon (BC), deposits over snow. In

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Yndestad, Leif Kåre Hornnes. "Particle-based Powder-snow Avalanche Simulation Using GPU." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for datateknikk og informasjonsvitenskap, 2011. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-15063.

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The main focus of this thesis was the simulation of a powder-snow avalanche flow. The simulation were implemented using the particle-based simulation solution SPH, from a mathematical model describing powder-snow flow dynamics. The simulation was accelerated by applying the computational power of the GPU, in order to provide a faster simulation time than would have been achieved on the CPU.

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Yam, Emily M. "The Role of Bacteria-Particle Interactions in Marine Snow Dynamics." W&M ScholarWorks, 2007. http://www.vims.edu/library/Theses/Yam07.pdf.

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8

Vigano, Alessandro. "Experimental and numerical modeling of wet snow accretion on structures." Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique, 2012. https://theses.hal.science/docs/00/78/61/89/PDF/A_VIGANO_PhD.pdf.

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Ce travail est consacré à l'étude du givrage atmosphérique des structures par accrétion de neige collante qui peut conduire à des dommages sévères aux structures. Les particules à la base de ce type d'accrétions sont caractérisées par un mélange d'eau et glace quantifié dans cette étude par un paramètre sans dimension : la teneur en eau liquide: TEL définie comme le ratio de la masse liquide sur la masse totale de la particule. La définition de la TEL considérée dans ce travail est différente de celle utilisée en aéronautique. Dans cette étude, la neige collante a été reproduite avec une tempé

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Sinclair, James R. "Positioning and timing calibration of SNO+." Thesis, University of Sussex, 2015. http://sro.sussex.ac.uk/id/eprint/57182/.

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The Sudbury Neutrino Observatory solved the solar neutrino problem, confirming neutri- nos have non-zero masses. Massive neutrinos raise questions about the nature of neutrinos, implying physics beyond the standard model and potentially a solution to the observed matter-antimatter asymmetry in the universe. The Sudbury Neutrino Observatory is be- ing upgraded, with the goal of probing the nature of neutrino masses. The experiment will also study reactor, geo, supernovae and solar neutrinos. The upgrade is characterised by changing the target mass from heavy water to scintillator. Using scintil

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Tuzet, François. "Dépôt, devenir et impact radiatif des impuretés dans le manteau neigeux : analyse des processus, simulations numériques et implications." Thesis, Toulouse 3, 2019. http://www.theses.fr/2019TOU30316.

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L'une des propriétés les plus fascinantes de la neige est sa blancheur, capable de transformer complètement un paysage en quelques heures. Cette couleur vient de la capacité unique de la neige à réfléchir le rayonnement solaire dans les longueurs d'onde visibles, c'est-à-dire son fort albédo. Cette particularité de la neige est d'une importance cruciale pour le bilan énergétique de surface et par conséquent pour un large éventail de questions sociales, écologiques et climatiques. La blancheur de la neige peut, cependant, être altérée par la présence d'impuretés absorbantes. Dans les Alpes euro

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11

Guidi, Lionel. "Particle flux transformation in the mesopelagic water column: process analysis and global balance." Diss., Texas A&M University, 2008. http://hdl.handle.net/1969.1/85946.

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Marine aggregates are an important means of carbon transfers downwards to the deep ocean as well as an important nutritional source for benthic organism communities that are the ultimate recipients of the flux. During these last 10 years, data on size distribution of particulate matter have been collected in different oceanic provinces using an Underwater Video Profiler. The cruise data include simultaneous analyses of particle size distributions as well as additional physical and biological measurements of water properties through the water column. First, size distributions of large aggregate

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Jones, Philip G. "Background rejection for the neutrinoless double beta decay experiment SNO+." Thesis, University of Oxford, 2011. http://ora.ox.ac.uk/objects/uuid:e99b0c4a-2cce-4e0a-9ce1-e0b8de12b264.

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The SNO+ experiment will use a liquid scintillator based detector to study solar, geo, and reactor neutrinos and double beta decay. This thesis discusses the effect of backgrounds on the measurement of neutrinoless double beta decay and describes analysis techniques developed to reduce their impact. Details of the modeling of the photomultiplier tubes in the SNO+ Monte Carlo RAT are first described and comparisons are made with the SNO Monte Carlo SNOMAN. SNOMAN has been extensively verified with calibration sources and RAT is shown to be in good agreement. The event reconstruction techniques

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Waterfield, James. "Optical calibration system for SNO+ and sensitivity to neutrinoless double-beta decay." Thesis, University of Sussex, 2017. http://sro.sussex.ac.uk/id/eprint/67570/.

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The SNO+ experiment is primarily looking for neutrinoless double-beta decay, an unobserved, lepton number violating radioactive decay. This is achieved by loading liquid scintillator with tellurium whose isotope 130Te decays via double beta decay with a Q-value of 2527 keV. An optical calibration system, located outside the scintillator, has been developed to help meet the radiopurity requirements of the experiment. This thesis describes the hardware component of the optical calibration system which calibrates the timing and charge response of the photomultiplier tube array of SNO+. A set of q

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Coulter, Ian T. "Modelling and reconstruction of events in SNO+ related to future searches for lepton and baryon number violation." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:495395b3-bf15-4c9b-851d-c13e7dad8a22.

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SNO+ is a liquid scintillator experiment whose physics goals include measurements of solar neutrinos, reactor anti-neutrinos, geo neutrinos and double beta decay. During an initial water phase, it will also search for invisible modes of nucleon decay. This thesis investigates methods of improving the detector's sensitivity to the baryon and lepton violating processes of neutrinoless double beta decay and invisible nucleon decay. It does this through an improved scintillator model, allowing the sensitivity of the detector with different loading techniques to be evaluated, through a new backgrou

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15

CAUTERUCCIO, ARIANNA. "The role of turbulence in particle-fluid interaction as induced by the outer geometry of catching-type precipitation gauges." Doctoral thesis, Università degli studi di Genova, 2020. http://hdl.handle.net/11567/999883.

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This thesis work investigates the particle-fluid interaction of hydrometeors along the terminal part of their fall trajectories, while approaching the collector of catching-type precipitation gauges in windy conditions. Both the turbulence generated by the bluff body aerodynamics of precipitation gauges when impacted by the wind and the free-stream turbulence inherent to the natural wind are addressed to assess their role in precipitation measurements. The bluff body aerodynamics of precipitation gauges induces deviations in the trajectories of the approaching hydrometeors due to the accelera

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Ralaiarisoa, Velotiana Jean-Luc. "Influence de la cohésion sur le transport éolien de particules : application au sable humide et à la neige." Thesis, Rennes 1, 2020. http://www.theses.fr/2020REN1S065.

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Cette thèse porte sur la caractérisation du transport sur un lit granulaire cohésif en considérant le cas du sable et de la neige. Une approche numérique pour étudier le processus de l'érosion par impact sur un empilement cohésif a permis de quantifier l'effet de la cohésion sur le processus Splash. Pour quantifier l'effet de la cohésion le transport de particules par un écoulement d'air, nous avons choisi une approche expérimentale en soufflerie. L'étude du transport sur un lit de sable sec a permis de caractériser la transition du régime de saltation vers un régime collisionnel lorsque le no

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von, Krosigk Belina. "Measurement of proton and alpha-particle quenching in LAB based scintillators and determination of spectral sensitivities to supernova neutrinos in the SNO+ detector." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-172922.

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SNO+, the successor of the Sudbury Neutrino Observatory, is an upcoming low energy neutrino experiment, located in the 2 km deep laboratory SNOLAB, Canada. The spheric acrylic vessel in the detector center will contain 780 t of LAB. The main goal of SNO+ is the search for the neutrinoless double beta decay of 130Te, using a novel scintillator in which natural Te is bound with an initial loading of 0.3% via water and a surfactant. Within this thesis, the first measurement of the Alpha-particle and proton quenching parameters of loaded and unloaded LAB is described. These parameters are crucial

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von, Krosigk Belina [Verfasser], Kai [Akademischer Betreuer] Zuber, and Lothar [Akademischer Betreuer] Oberauer. "Measurement of proton and alpha-particle quenching in LAB based scintillators and determination of spectral sensitivities to supernova neutrinos in the SNO+ detector / Belina von Krosigk. Gutachter: Kai Zuber ; Lothar Oberauer. Betreuer: Kai Zuber." Dresden : Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2015. http://d-nb.info/1073781224/34.

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19

Demir-kivrak, Hilal. "Synthesis And Characterization Of Ethanol Electro-oxidation Catalysis." Phd thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12613887/index.pdf.

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ABSTRACT SYNTHESIS AND CHARACTERIZATION OF ETHANOL ELECTRO-OXIDATION CATALYSIS Demir-Kivrak, Hilal Ph.D., Department of Chemical Engineering Supervisor : Prof. Dr. Deniz &Uuml<br>ner Co-supervisor : Dr. Sadig Kuliyev October 2010, 196 pages In this study, the role of defects, the role of Sn in relation to defects, and the role of oxide phase of tin in ethanol electro-oxidation reaction were investigated. Firstly, adsorption calorimetry measurements were conducted on monometallic (1%Pt, 2%Pt, and 5%Pt) and bi-metallic (5% Pt-Sn) &gamma<br>-Al2O3 supported Pt catalysts. It was observed that whil

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20

Aleksandra, Mihailović. "Fizičke karakteristike zemljišta i distribucija teških metala na gradskom području Novog Sada." Phd thesis, Univerzitet u Novom Sadu, Prirodno-matematički fakultet u Novom Sadu, 2015. https://www.cris.uns.ac.rs/record.jsf?recordId=94955&source=NDLTD&language=en.

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Uzorci zemlji&scaron;ta iz pov&scaron;inskog sloja dubine 0 - 10 cmprikupljeni su sa 121 lokacije na gradskom području NovogSada. Ispitivano područje obuhvatilo je povr&scaron;inu (4 x 5)km<sup>2</sup>,koja je podeljena na mrežna polja veličine (400 x 400) m<sup>2 </sup>i u          svakom polju uzet je po jedan uzorak. Za 121 uzorakgradskog zemlji&scaron;ta Novog Sada ispitana su fizičko-hemijskasvojstva zemlji&scaron;ta, ukupni i pristupačni sadržaj metala (As,Co, Cr, Cu, Mn, Ni, Pb, Zn) i njihova prostorna raspodela.Konturne mape prostorne r

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Shih-HuaLiu and 劉士華. "Control Mechanism of CO2 Snow Particle Size and Applications in Surface Cleaning." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/9jbndw.

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22

Fu, chung-ho, and 傅羣賀. "Fabrications and characterization of the CO sensor by screen printing SnO2 and ZnO nano particles." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/84810151803573758610.

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碩士<br>國立中山大學<br>機械與機電工程學系研究所<br>101<br>Due to the increased awareness of living and industrial safety, carbon monoxide detectors must be geared towards better portability and sensitivity. Metal oxide semiconductor sensors should possess advantages such as heat and corrosion resistance, low cost materials, and ease of miniaturization. This thesis applied ball milled and powdered ZnO and SnO2 to manufacture into paste, then used the screen printing method deposited ZnO and SnO2 paste film and silver electrode on glass substrate. The influence on sensing film materials, temperature, time of heat

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Gamage, Don Sampath. "Near-Field Nanoscale Spectroscopy and Imaging of Enveloped Virus Particles and Layered Materials." 2017. http://scholarworks.gsu.edu/phy_astr_diss/97.

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Deeper understanding and technological progress in materials physics demand exploration of soft and hard matter at their relevant length scales. This research focuses on the nanometer length scale investigation of structural changes required for membrane fusion in virus nanoparticles and nano-spectroscopic investigation of layered material surfaces implementing scattering type scanning near-field optical microscopy (s-SNOM). Spectroscopy and imaging experiments were deployed to investigate the chemical and structural modifications of the viral protein and lipid bilayer under various environmen

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Oruganti, Sri vidya. "Structural studies of box C/D (sno)RNP particle, an RNA guided modification enzyme." 2007. http://etd.lib.fsu.edu/theses/available/etd-04042007-104406.

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Thesis (Ph. D.)--Florida State University, 2007.<br>Advisor: Hong Li, Florida State University, College of Arts and Sciences, Dept. of Chemistry and Biochemistry. Title and description from dissertation home page (viewed May 21, 2008). Document formatted into pages; contains xiii, 93 pages. Includes bibliographical references.

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Walker, Matthew. "Calibration Hardware Research and Development for SNO+." Thesis, 2014. http://hdl.handle.net/1974/12225.

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The SNO+ experiment is a kilo-tonne scale liquid scintillator detector located at SNOLAB in Sudbury, Ontario, Canada. As the successor to the Sudbury Neutrino Observatory, SNO+ will use linear alkylbenzene (LAB) as the scintillator to study neutrinos. During the solar phase, ux measurements will be made of low energy neutrinos originating in the Sun. In another phase, 800 kg of tellurium will loaded into the scintillator to search for neutrinoless double beta decay. Measurements will also be made of neutrinos coming from nearby nuclear reactors and from inside Earth's mantle and crust. To ena

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FALCONI, MARTA TECLA. "Remote sensing and electromagnetic modeling applied to weather and forward scatter radar." Doctoral thesis, 2018. http://hdl.handle.net/11573/1080160.

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This dissertation deals with electromagnetic modelling and data analysis, related to radar remote sensing and applied to forward scatter and meteorological polarimetric systems. After an overview of radar fundamentals to introduce the general terminology and concepts, results are presented at the end of each chapter. In this respect, a generalized electromagnetic model is first presented in order to predict the response of forward scatter radars (FSRs) for airtarget surveillance applications in both near-field and far-field regions. The model is discussed for increasing levels of compl

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