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Dissertations / Theses on the topic 'Particle charging'

Author: Grafiati

Published: 4 June 2021

Last updated: 26 July 2025

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1

Hangsubcharoen, Monpilai. "A Study of Triboelectrification for Coal , Quartz and Pyrite." Diss., Virginia Tech, 1999. http://hdl.handle.net/10919/27447.

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The separation efficiency of a triboelectrostatic separation (TES) for fine coal cleaning depends profoundly on the surface charges of the particles involved. In general, the larger the difference between the charges of the particle to be separated, the higher the separation efficiency. The premise that coal and mineral matter can be triboelectrically charged differently serves as a basis for the TES process. In order to improve the separation performance, it is apparent that a highly efficient charger is needed for the TES unit, as well as the information on the triboelectrification mechanism

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2

Brown, Douglas 1955. "Theoretical study of particle charging and entrapment in a cylindrical ion beam." Thesis, The University of Arizona, 1990. http://hdl.handle.net/10150/277287.

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A particle within an ion beam is subjected to positive and negative currents. These currents deposit a net charge on the particle which interacts with the potential of the beam. A model is presented which describes this charging, the time required to attain an arbitrary charge, and the resulting coulomb force. Confinement by the beam is investigated through comparison of the electric force to the opposing force of gravity. To quantify this comparison, a normalized force is defined which, when negative, predicts those spatial regions where particle entrapment can occur. Utilizing a specially wr

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3

Daryanani, Roshan D. "Potential distribution around dust particles in plasmas." Thesis, University of Oxford, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.337811.

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4

Wang, Pu. "Immersed Finite Element Particle-In-Cell Modeling of Surface Charging in Rarefied Plasmas." Diss., Virginia Tech, 2010. http://hdl.handle.net/10919/37368.

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Surface charging is a fundamental interaction process in space plasma engineering. A three-dimensional Immersed Finite Element Particle-In-Cell (IFE-PIC) method is developed to model surface charging involving complex boundary conditions. This method extends the previous IFE-PIC algorithm to explicitly include charge deposition on a dielectric surface for charging calculations. Three simulation studies are carried out using the new algorithm to model current collection and charging in both the orbital motion limited (OML) and space charge limited regime. The first one is a full particle simula

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5

Forward, Keith Mitchell. "Triboelectrification of Granular Materials." Cleveland, Ohio : Case Western Reserve University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=case1238090974.

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6

Barrie, Alexander. "Modeling Differential Charging of Composite Spacecraft Bodies Using the Coliseum Framework." Thesis, Virginia Tech, 2006. http://hdl.handle.net/10919/34743.

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The COLISEUM framework is a tool designed for electric propulsion plume interactions. Virginia Tech has been developing a module for COLISEUM called DRACO, a particle-in-cell based code capable of plume modeling for geometrically complex spacecraft. This work integrates a charging module into DRACO. Charge is collected via particle impingement on the spacecraft surface and converted to potential. Charge can be stored in the surface, or added to a local ground potential. Current can flow through the surface and is governed by the internal electric field in the spacecraft. <p>Several test case

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7

Jeong, Hyunju. "Kinetic Simulations of Spacecraft Charging and Plasma Interactions in the Solar Wind." Diss., Virginia Tech, 2008. http://hdl.handle.net/10919/30237.

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Analytical and numerical studies are carried out to investigate spacecraft charging and plasma interactions in the solar wind. The physics of spacecraft charging in solar wind is determined by the mesothermal flow and the photoelectron sheath. In order to properly resolve both plasma flow and the photoelectron sheath, a 3-D full particle PIC model is applied. In this model, all plasma species (ambient ions and electrons, and photoelectrons) are modeled as macro-particles so the detailed dynamics of each species can be resolved around a charged spacecraft. In order to correctly resolve the meso

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8

Liu, Qiaoling. "Ultrafine particle generation and measurement." VCU Scholars Compass, 2015. http://scholarscompass.vcu.edu/etd/3971.

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Ultrafine particles (UFPs) with diameters smaller than 100 nm are omnipresent in ambient air. They are important sources for fine particles produced through the agglomeration and/or vapor condensation. With their unique properties, UFPs have also been manufactured for industrial applications. But, from the toxicological and health perspective, ultrafine particles with high surface-to-volume ratios often have high bio-availability and toxicity. Many recent epidemiologic studies have evidence UFPs are highly relevant to human health and disease. In order to better investigate UFPs, better instru

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9

Salyer, Zachary M. "Identification of Optimal Fast Charging Control based on Battery State of Health." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1587037951166857.

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10

Hoshi, Kento. "Study on Active Spacecraft Charging Model and its Application to Space Propulsion Systeｍ". Kyoto University, 2018. http://hdl.handle.net/2433/232002.

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11

Sprenger, Susanne [Verfasser]. "Interplay between charging effects and multi-particle transport in superconducting single electron transistors with tunable junctions / Susanne Sprenger." Konstanz : KOPS Universität Konstanz, 2020. http://d-nb.info/1213246881/34.

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12

Janeski, John. "Dynamics of an Electrodynamic Tether System in a Varying Space-Plasma Environment." Diss., Virginia Tech, 2013. http://hdl.handle.net/10919/23922.

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Electrodynamic tethers have a wide range of proposed applications in the fields of satellite propulsion and space plasma research. The fundamental purpose of this dissertation is to improve the understanding of the behavior of an electrodynamic tether (EDT) system in Earth's ionosphere. An electrodynamic tether system consists of two satellites connected by a long tether that generates current to produce either power or thrust via the system's electromagnetic interaction with the space environment. Previous electrodynamic tether investigations decouple the interaction between the tether and t

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13

Eboreime, Ohioma. "Numerical Modeling of the Novel Cross-Flow Electrostatic Precipitator." Ohio University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1575646113189561.

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14

Aghanifor, Ishmael. "Charging the use of studded tires in Stockholm city-A cost Benefit analysis." Thesis, http://www.eurafrika.com, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-37753.

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The stockholm county proposed legislation in 2010 on the use of studded tires in the city. The aim of the policy was to reduce the use of studded tires by 50 percent. The research question investigates the authenticity of the policy where it was hypothesized that the net social benefits for the imposition of this charge was less than or equal to zero. Emperical literatures were chosen systematically and with the help of theories on welfare economics, a meta analysis was employed quantifying cost and benefits of all outcomes. The findings shows that the NSB is less than zero meaning that it was

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15

Song, Di. "Study of Electrostatic Charging and Particle Wall Fouling in a Pilot-scale Pressurized Gas-Solid Fluidized Bed up to Turbulent Flow Regime." Thesis, Université d'Ottawa / University of Ottawa, 2017. http://hdl.handle.net/10393/36007.

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In gas-solid fluidized beds, the generation of electrostatic charges due to continuous contacts between fluidizing particles, and the particles and the fluidization vessel wall, is unavoidable. Industrial operations, such as the production of polyethylene, are susceptible to significant operational challenges caused by electrostatics including reactor wall fouling, a problem known as “sheeting”. The formation of particle sheets can require shutdown periods for clean-up which results in significant economic losses. To gain a better understanding of the underlying mechanisms of electrostatic cha

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16

Pustylnik, M. Y., N. Ohno, S. Takamura, and R. Smirnov. "Modification of the damping rate of the oscillations of a dust particle levitating in a plasma due to the delayed charging effect." American Physical Society, 2006. http://hdl.handle.net/2237/8846.

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17

Forouzan, Mohammad Mehdi. "Simulation and Experiments to Understand the Manufacturing Process, Microstructure and Transport Properties of Porous Electrodes." BYU ScholarsArchive, 2018. https://scholarsarchive.byu.edu/etd/6791.

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Battery technology is a great candidate for energy storage applications. The need for high-performance and cost-effective batteries has motivated researchers to put much effort into improving battery performance. In this work, we attempt to understand the elements that affect the microstructure and performance of two battery systems. The first part of this work focuses on the investigation of transport and structural properties of porous electrodes in an alkaline electrolyte. A DC polarization method was deployed for tortuosity measurements. An apparatus was designed to flow specified current

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18

Kotian, Reshma. "Electrical Behavior of Non-Aqueous Formulations: Role of Electrostatic Interactions in Pressurized Metered Dose Inhalers (pMDIs)." Unavailable until 8/19/2013, 2008. http://hdl.handle.net/10156/2280.

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19

Das, Subhankar. "Electrostatic charging and separation of fine particles." Poitiers, 2007. http://www.theses.fr/2007POIT2299.

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L’objectif de ce travail a été double : améliorer la connaissance des facteurs qui influencent les processus de charge des particules < 1 mm et proposer desProcédés innovants pour la séparation des mélanges de matériaux pulvérulents fins. La méthodologie des plans d’expérience a été utilisée pour la modélisation du processus de charge triboélectrique de poudres dans des dispositifs pneumatiques. En utilisant la charge en champ couronne, il a été possible de mettre au point, un procédé destiné au recyclage des cendres issues des centrales thermoélectriques à charbon. La compréhension des phénom

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20

Bau, Sébastien. "Étude des moyens de la surface des aérosols ultrafins pour l'évaluation de l'exposition professionnelle." Thesis, Vandoeuvre-les-Nancy, INPL, 2008. http://www.theses.fr/2008INPL095N/document.

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Ce travail s'inscrit dans le cadre de l'amélioration de la connaissance sur la mesure de la surface des aérosols ultrafins. En effet, l'essor des nanotechnologies peut être à l'origine de situations d'exposition professionnelle aux particules nanostructurées dispersées dans l'air, ce qui soulève une problématique nouvelle de prévention. Si à ce jour aucun des trois indicateurs (masse, surface, nombre) ne fait l'objet d'un consensus, il semble que le paramètre de surface des particules permet une bonne corrélation avec les effets biologiques observés lorsqu'elles sont inhalées. Un travail théor

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21

Bagga, Payel. "Measurement of Electrostatic Dipoles and Net Charge on Air Dispersed Particles." Thesis, University of Canterbury. Chemical and Process Engineering, 2009. http://hdl.handle.net/10092/2992.

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Dipoles are expected to often dramatically enhance the mutual collision rate of diffusing particles (above the effects of Brownian or turbulent motion). However, this spreading awareness of the possible influence of discrete dipoles on particles is still based largely on theory, and some qualitative experience of particle behaviour from microgravity experiments. Individual particle dipoles have not yet been definitely isolated in experiments, nor measured in practical situations. In this project, it was intended to measure, for the first time, distributions of dipole strength (as well as net c

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22

Butterworth, Sean. "Shape and chemical anisotropic particles in low dielectric constant media." Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/shape-and-chemical-anisotropic-particles-in-low-dielectric-constant-media(d8ace7a1-8993-4a6b-a50d-2a2ea71c10f8).html.

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Electrophoretic displays (EDPs) are an attractive low power technology for small to large area displays. Such display technology has seen a surge of research interest with the launch of successful e-readers in the market place, owing to their lower power consumption and paper-like quality. This work aims to look at the influence of shape on the electrophoretic mobility of particles for such devices. Crosslinked poly(methyl methacrylate) (PMMA) precursor particles with a narrow size distribution were produced by non aqueous dispersion polymerisation utilising a pump-feed method. To produce shap

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23

Li, Yiming. "Determination of chargino and neutralino masses at the International Linear Collider." Thesis, University of Oxford, 2011. http://ora.ox.ac.uk/objects/uuid:b67602fb-93c2-4986-a2a5-414f8c0dc5cd.

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A feasibility study is presented which measures the masses of the chargino X̃₁<sup>±</sup> and neutralinos X̃₁⁰ and X̃₂⁰ using the processes of e⁺e⁻→ X̃₁<sup>+</sup>X̃₁<sup>-</sup> → X̃₁⁰X̃₁⁰W⁺W⁻ and e⁺e⁻→ X̃₂⁰X̃₂⁰ → X̃₁⁰X₁⁰ZZ at the International Linear Collider. The detector simulation is based on the Silicon Detector (SiD) concept and an integrated luminosity of 500 fb⁻¹ is considered at the centre-of-mass energy of 500 GeV. A template-fitting method is employed to measure the chargino and neutralino masses, which results in uncertainties of 0.16 GeV, 0.5 GeV and 1.0 GeV for the mass of X̃₁

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24

Akatsuka, Shunichi. "Search for chargino and neutralino production using final states with two soft leptons in pp collisions at √s = 13 TeV." Kyoto University, 2020. http://hdl.handle.net/2433/253471.

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25

Tylmad, Maja. "Search for Weakly Produced Supersymmetric Particles in the ATLAS Experiment." Doctoral thesis, Stockholms universitet, Fysikum, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-108060.

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The Large Hadron Collider located at CERN is currently the most powerful particle accelerator and ATLAS is an experiment designed to exploit the high energy proton-proton collisions provided by the LHC. It opens a unique window to search for new physics at very high energy, such as supersymmetry, a postulated symmetry between fermions and bosons. Supersymmetry can provide a solution to the hierarchy problem and a candidate for Dark Matter. It also predicts the existence of new particles with masses around 1 TeV, thus reachable with the LHC. This thesis presents a new search for supersymmetry i

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26

Guo, Qiong. "Surfactants in nonpolar oils: agents of electric charging and nanogel templates." Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/43622.

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This thesis studies the formation of mobile and surface-bound electric charges in nonpolar liquids. Unlike aqueous media with their natural abundance of charged species, liquids of low dielectric constant do not readily accommodate charges, but can do so in the presence of certain surfactant additives. Surfactant-mediated charging in nonpolar oils has long been exploited industrially, but the underlying charging mechanisms are far from understood. The present work seeks clarification by comparing the effect of ionic and nonionic surfactants on the conductivity of nonpolar solutions and the ele

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27

Hart, Andrew Evan. "Search for disappearing tracks in proton-proton collisions at √s = 13 TeV." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1517587469347379.

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28

CARRA, SONIA. "SEARCH FOR ELECTROWEAK PRODUCTION OF SUPERSYMMETRIC PARTICLES AT THE LHC RUN 2 WITH THE ATLAS DETECTOR." Doctoral thesis, Università degli Studi di Milano, 2019. http://hdl.handle.net/2434/608194.

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Two closely related searches for the electroweak production of Supersymmetric particles are presented in this manuscript. The analyses are based on the proton-proton collision data from the Large Hadron Collider Run 2, with a center-of-mass energy of 13 TeV, collected by the ATLAS experiment. Different Supersymmetric signal models are considered. The first search targets the pair production of either the Supersymmetric partners of the leptons (sleptons) or the $W$ boson and charged Higgs boson super-partners (charginos). In the latter case, the decay of charginos via sleptons is assumed. The

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29

Debove, Jonathan. "QCD resummations for gaugino-pair hadroproduction." Grenoble, 2010. http://www.theses.fr/2010GRENY030.

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L’ajout de la supersymétrie au Modèle Standard (MS) de la physique des particules est très bien motivée. Reliant les bosons aux fermions dans un formalisme élégant, la super-symétrie propose une solution naturelle au problème de hiérarchie et permet l’unification des trois constantes de couplages du MS à grande échelle d’énergie. De plus, si la R-parité est conservée, elle fournit un candidat naturel pour expliquer la grande quantité de matière noire observée dans l’univers. Dans le MS supersymétrique minimal, c’est généralementle neutralino, l’un des partenaires supersymétriques des bosons él

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30

Lesné, Vincent. "Recherche de charginos et neutralinos dans le canal dimuon de même signe auprès de l'expérience Dphi-FNAL." Phd thesis, Université Blaise Pascal - Clermont-Ferrand II, 2006. http://tel.archives-ouvertes.fr/tel-00693958.

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Dans le cadre du modèle mSUGRA qui décrit un mécanisme de brisure simple de la supersymétrie, des sparticules avec des masses au-delà des limites fixées par les expériences de LEP II peuvent être produites au Tevatron, collisionneur pp délivrant une énergie de 1.96Tev dans le centre de masse. Un canal privilégié pour la découverte de la supersymétrie au Tevatron est la production associée du plus chargé chargino, chi-+, et du second plus léger neutralino, chi 20. Les modes de désintégrations leptoniques, chi20->chi10l+l- et chi1+-->chi10l+-nul, conduisent à une signature claire avec trois lept

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31

Mambrini, Yann. "Désintégration des superparticules dans le Modèle Standard Supersymétrique Minimal." Paris 11, 2001. http://www.theses.fr/2001PA112231.

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Dans le cadre du modèle standard supersymetrique minimal (MSSM) ou la super-particule la plus légère (LSP), le neutralino, est stable, nous avons étudié les modes de désintegration des super-partenaires scalaires des fermions, les sfermions, et des super-partenaires de spin demi-entier des bosons de jauge et de Higgs, les gluinos, charginos et neutralinos. En particulier, nous nous sommes intéressés aux désintegrations à plusieurs corps dans les scenarios de grande unification ou le mélange entre fermions scalaires de la troisième génération est fort, impliquant des scalaires top, bottom et ta

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32

Mathieu, Romain. "Modélisation de l'influence de la rapidité de recharge totale ou partielle sur les performances électro-thermiques et la durée de vie des batteries pour applications automobiles." Thesis, Bordeaux, 2020. http://www.theses.fr/2020BORD0026.

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La charge rapide des batteries est un enjeu majeur pour le développement de l’automobile électrique. Côté infrastructure, un déploiement de chargeurs de haute voire très haute puissance est en cours. Ces hautes puissances motivent une recherche sur les batteries, dans l’objectif de réduire significativement leurs durées de charge.Pour une cellule de batterie de caractéristiques données, la puissance de charge est limitée par des considérations électriques, thermiques et de durée de vie. Cette thèse souhaite alors apporter une contribution à la réduction du temps de charge, par une approche num

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33

Konečný, Zdeněk. "Vliv oxidu titaničitého na vlastnosti olověných akumulátorů pracujících v režimu hybridních vozidel." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2012. http://www.nusl.cz/ntk/nusl-219871.

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This work deals with lead-acid batteries operating in hybrid electric vehicles mode, i.e. in a partial state of charge. The adverse effects such as premature capacity loss and large internal resistance can markedly affect the life of a lead battery. The experiment described in this work aims to clarify the influence of the titanium dioxide in the active mass of negative electrodes especially in the life of lead acid batteries.

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34

呂紹豪, Shao-Hao Lu, and 呂紹豪. "Effect of a Unipolar Ion Jet Generator on Characterization of Particle Charging." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/zmve97.

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碩士<br>國立臺北科技大學<br>環境工程與管理研究所<br>101<br>Nanoparticle (dp≦100 nm) charging plays an important role in both scientific studies and practical applications related to aerosols, such as nano-structure patterning, contamination control, and aerosol instrumentation. However, the average charges of nanoparticle might be below one elementary charge. Therefore, it is necessary to improve the charge efficiency of nanoparticle. A charge system was set up in this study, including aerosol generator system and unipolar ion generator. The objectives of this research were to study the average charges of pa

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35

Chan, Sheng-Kai, and 詹聖凱. "Effect of operating parameters on submicron particle agglomeration by bipolar charging system." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/68ss44.

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碩士<br>國立臺北科技大學<br>環境工程與管理研究所<br>102<br>Electrostatic agglomeration is a technique which can let the particle agglomeration. Particles move and collide with each other as electric field is provided. The small particles are growing into a large one and the particle number concentration is decreased when particles agglomerate. The mechanisms of the electrostatic agglomeration include: (1) Particles are charged by two different polar corona chargers. (2) These particles oscillate in an alternating electric field, and then particle collide with each other. However, the agglomeration efficiency of s

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López-Yglesias, Xerxes F. "Physical Investigations of Small Particles: (I) Aerosol Particle Charging and Flux Enhancement and (II) Whispering Gallery Mode Sensing." Thesis, 2013. https://thesis.library.caltech.edu/7699/7/Lopez-Yglesias-XF-2013a.pdf.

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<p>Part I</p> <p>Particles are a key feature of planetary atmospheres. On Earth they represent the greatest source of uncertainty in the global energy budget. This uncertainty can be addressed by making more measurement, by improving the theoretical analysis of measurements, and by better modeling basic particle nucleation and initial particle growth within an atmosphere. This work will focus on the latter two methods of improvement.</p> <p>Uncertainty in measurements is largely due to particle charging. Accurate descriptions of particle charging are challenging because one deals with pa

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Ting-WeiChang and 張庭維. "Search for an Optimal Four-Stage Constant Current Charging Pattern for Li-Ion Batteries with Hybrid Taguchi-Particle Swarm Optimization." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/r6ydzt.

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Chéreau, Xavier. "Recherche de charginos et de neutralinos avec le détecteur L3 au LEP." Phd thesis, 1998. http://tel.archives-ouvertes.fr/tel-00003063.

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Ce travail de thèse présente une recherche expérimentale de particules supersymétriques, les<br />charginos et neutralinos, avec le détecteur L3 auprès du collisionneur e+e- LEP à une énergie<br />dans le centre de masse de s = 161, 172 et 183 GeV. Dans le cadre de la conservation de la<br />R-parité, les événements recherchés ont une énergie manquante significative emportée par la<br />plus legère des particules supersymétriques (LSP), ce qui permet de les distinguer des<br />événements standards. Pour cela, un ensemble de sélections qui optimisent le rapport<br />signal sur bruit est mis au

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David, Claire. "Search for supersymmetry using a Higgs boson in the decay cascade with the ATLAS detector at the Large Hadron Collider." Thesis, 2016. http://hdl.handle.net/1828/7254.

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The Standard Model of particle physics is a successful theory, yet it is incomplete. Supersymmetry is one of the favoured extensions of the Standard Model, elegantly addressing several unresolved issues. This thesis presents a search for the pair production of supersymmetric particles chargino one and neutralino two, where the neutralino two decays to the lightest neutralino and the 125 GeV Higgs boson. The final states considered for the search have large missing transverse momentum, an isolated lepton and two jets identified as originating from bottom quarks. The analysis is based on 20.3 in

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