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Dissertations / Theses on the topic 'Diameter of molecules of gases'

Author: Grafiati

Published: 4 June 2021

Last updated: 9 February 2022

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1

Newell, Catherine A. "INELASTIC COLLISIONS IN COLD DIPOLAR GASES." UKnowledge, 2010. http://uknowledge.uky.edu/gradschool_diss/30.

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Inelastic collisions between dipolar molecules, assumed to be trapped in a static electric field at cold (> 10−3K) temperatures, are investigated and compared with elastic collisions. For molecules with a Λ-doublet energy-level structure, a dipole moment arises because of the existence of two nearly degenerate states of opposite parity, and the collision of two such dipoles can be solved entirely analytically in the energy range of interest. Cross sections and rate constants are found to satisfy simple, universal formulas. In contrast, for molecules in a Σ electronic ground state, the static e

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2

Seeßelberg, Frauke [Verfasser], and Immanuel [Akademischer Betreuer] Bloch. "Interacting gases of ultracold polar molecules / Frauke Seeßelberg ; Betreuer: Immanuel Bloch." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2019. http://d-nb.info/1189585022/34.

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3

O'Brien, Leah Christine. "Laser and Fourier transform spectroscopy of gas phase molecules." Diss., The University of Arizona, 1987. http://hdl.handle.net/10150/184305.

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Laser and Fourier transform spectroscopy were used to study a variety of gas phase molecules. A series of calcium and strontium monoalkoxides, CaOR and SrOR [R=H, CH₃, CH₂CH₃, CH(CH₃)₂, CH₂CH₂CH₃, CH₂(CH₂)₂CH₃, CH₂(CH₃)CH₂CH₃ and C(CH₃)₃] was studied by laser induced fluorescence and laser excitation techniques. The A - X and B - X electronic transitions were recorded. Calcium and strontium monocyclopentadienide, CaCp and SrCp, were produced in a Broida oven and the spectra were recorded at low resolution by laser techniques. The geometry of these molecules is like an "open-faced sandwich", wi

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4

Keehan, Michael Stephen. "Termolecular ion-atom association." Diss., Georgia Institute of Technology, 1990. http://hdl.handle.net/1853/29445.

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5

Kumar, Amit. "Configurational diffusion of small gas molecules in nanostructured materials a computational and experimental study /." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 287 p, 2010. http://proquest.umi.com/pqdweb?did=1992491961&sid=4&Fmt=2&clientId=8331&RQT=309&VName=PQD.

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6

Hedin, Lage. "Studies of Single and Multiple Ionization Processes in Rare Gases and some Small Molecules." Doctoral thesis, Uppsala universitet, Molekyl- och kondenserade materiens fysik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-221128.

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In this thesis various aspects of photoionization are investigated with respect to both single and multiple electron emission from atoms and molecules. The studies include both valence and core levels and involve transitions which leave the atoms or molecules in various charge states. S2p electrons in the CS2 molecule were excited into Rydberg orbitals close to the ionization threshold. Subsequent autoionization leads to the emission of single electrons which were detected by a conventional electron spectrometer, bringing the molecule into various cationic states characterized by two valence h

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7

Gempel, Matthias Walter [Verfasser]. "Towards ultracold polar NaK molecules and the investigation of dipolar quantum gases / Matthias Walter Gempel." Hannover : Technische Informationsbibliothek (TIB), 2016. http://d-nb.info/1099121922/34.

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8

Bellotti, Filipe Furlan. "Triatomic molecules in two-dimensional layers." Instituto Tecnológico de Aeronáutica, 2012. http://www.bd.bibl.ita.br/tde_busca/arquivo.php?codArquivo=2056.

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We found universal laws for the spectrum of two-dimensional three-body systems, composed by two identical particles and a distinct one (AAB). These universal laws appear when the potential range (r_0) is much smaller than the size of the system. In two dimensions this condition is formulated as (E2 is the two-body energy and ? is the reduced mass). The zero range model, which is very appropriated to establish the universal laws, is introduced through the ?-Dirac potential. We derive the corresponding two-dimensional Faddeev equations for the three-body system and solve them numerically in

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9

Anand, Aman Roberts James Andrew. "Studying interactions of gas molecules with nanomaterials loaded in a microwave resonant cavity." [Denton, Tex.] : University of North Texas, 2007. http://digital.library.unt.edu/permalink/meta-dc-4009.

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10

Brooke, James S. A. "Line lists including intensities for diatomic molecules of astronomical interest and remote sensing measurements of greenhouse gases." Thesis, University of York, 2014. http://etheses.whiterose.ac.uk/8352/.

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Line lists including positions and absolute intensities have been produced using a combination of theoretical and experimental methods, for several spectroscopic systems of diatomic molecules, including the C2 and 12C13C Swan systems, the CN, 13CN, and C15N A2Π-X2Σ+ (red), B2Σ+-X2Σ+ (violet), and X2Σ+ state rovibrational systems, the CP A2Π-X2Σ+ system, and the NH X3Σ− state rovibrational and rotational transitions. Preliminary calculations for the OH X2Π state rovibrational transitions have also been performed. RKR potential energy curves, vibrational wavefunctions, and matrix elements (MEs)

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11

Keskin, Seda. "Accelerating development of metal organic framework membranes using atomically detailed simulations." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/31679.

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Thesis (Ph.D)--Chemical Engineering, Georgia Institute of Technology, 2010.<br>Committee Chair: Sholl, David S.; Committee Member: Chance, Ronald R.; Committee Member: Jang, Seung Soon; Committee Member: Koros, William J.; Committee Member: Nair, Sankar. Part of the SMARTech Electronic Thesis and Dissertation Collection.

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12

Anand, Aman. "Studying Interactions of Gas Molecules with Nanomaterials Loaded in a Microwave Resonant Cavity." Thesis, University of North Texas, 2007. https://digital.library.unt.edu/ark:/67531/metadc4009/.

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A resonant cavity operating in TE011 mode was used to study the adsorption response of single walled carbon nanotubes (SWCNTs) and other nanomaterials for different types of gas molecules. The range of the frequency signal as a probe was chosen as geometry dependent range between 9.1 -9.8 GHz. A highly specific range can be studied for further experiments dependent on the type of molecule being investigated. It was found that for different pressures of gases and for different types of nanomaterials, there was a different response in the shifts of the probe signal for each cycle of gassing and

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13

Haney, Lisa L. "Surface induced dissociation of small molecules and peptides utilizing delayed extraction with tandem time-of-flight mass spectrometery [sic] /." free to MU campus, to others for purchase, 1999. http://wwwlib.umi.com/cr/mo/fullcit?p9962529.

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14

Petty, Renee Lynn. "Catalytic Decomposition of Nitric Oxide and Carbon Monoxide Gases Using Nanofiber Based Filter Media of Varying Diameters." University of Akron / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=akron1279505229.

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15

Hanna, Thomas Mark. "Dynamics of Feshbach molecule production." Thesis, University of Oxford, 2008. http://ora.ox.ac.uk/objects/uuid:676c8932-9c30-4776-a264-67405fe61c0c.

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The variation of a magnetic field in the vicinity of a zero-energy resonance allows highly vibrationally excited molecules (‘Feshbach molecules’) to be produced from an ultracold atomic gas. In this thesis, we study the dynamics of this process. We begin by studying the dissociation of Feshbach molecules, showing that in the limit of a sudden jump the shape of the spectrum of dissociated atoms can act as a probe of the zero-energy resonance. For some resonances, such jumps are within reach of current experiments. We also study the intermediate region between sudden jumps and asymptotically wid

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16

Palma, André Manuel Moreira. "Predictive methods for the association parameters of multifunctional molecules with the CPA EoS." Doctoral thesis, Universidade de Aveiro, 2017. http://hdl.handle.net/10773/22848.

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Doutoramento em Engenharia Química<br>O projeto e otimização de processos envolvendo moléculas associativas multifuncionais é de elevada importância para as indústrias química, petroquímica, farmacêutica, alimentar, energética e de cosméticos. A equação de estado (EoS) Cubic –Plus-Association (CPA) tem demonstrado ser um modelo termodinâmico adequado para a descrição de diversas moléculas associativas. Este modelo é utilizado frequentemente na indústria de gás e petróleo para a descrição, entre outros, de sistemas de água com hidrocarbonetos e de formação e inibição de hidratos de gás. Os seu

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17

McMullen, Erin. "Characterization of the large diameter fibers in egg case silk : identification of a core fibroin, TuSp1, and localization of fibroin-like molecules, ECPs, from the black widow spider, latrodectus hesperus." Scholarly Commons, 2008. https://scholarlycommons.pacific.edu/uop_etds/704.

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Araneoid spiders use specialized sets of abdominal silk glands to produce up to seven different types of silks, each with diverse functional properties. At the time of these studies, fibroin eDNA sequences that encode egg case silk had not been reported in the literature. This study used conventional nucleic acid-nucleic acid screening of a eDNA library to isolate a novel gene, named tubuliform spidroin 1 , from the black widow spider Latrodectus hesperus. TuSp 1 was demonstrated to be selectively expressed in the tubuliform gland (the gland suspected for egg case silk production), and examina

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18

Hartmann, Gregor [Verfasser], Uwe [Akademischer Betreuer] Becker, Thomas [Akademischer Betreuer] Möller, and Jens [Akademischer Betreuer] Viefhaus. "Coherence effects of diatomic homonuclear molecules and sequential two-photon processes of noble gases in the photoionization / Gregor Hartmann. Gutachter: Thomas Möller ; Jens Viefhaus. Betreuer: Uwe Becker." Berlin : Technische Universität Berlin, 2014. http://d-nb.info/1065669879/34.

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19

El, Sayed Shehata Nasr Sameh. "Supramolecular Chemistry: New chemodosimeters and hybrid materials for the chromo-fluorogenic detection of anions and neutral molecules." Doctoral thesis, Universitat Politècnica de València, 2015. http://hdl.handle.net/10251/52598.

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[EN] Abstract The present PhD thesis entitled "Supramolecular Chemistry: New chemodosimeters and hybrid materials for the chromo-fluorogenic detection of anions and neutral molecules" is based on the application of supramolecular chemistry and material science principles for the development of optical chemosensors for anions and neutral molecules detection. The second chapter of this PhD thesis is devoted to the preparation of chemodosimeters for the chromo-fluorogenic detection of fluoride, diisopropyl fluorophosphates (DFP) and hydrogen sulfide. The optical detection of fluoride anion

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20

Braga, André Soares. "Medidas de dispersão de gás em células mecânicas industriais e seus condicionantes." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/3/3134/tde-07062016-145736/.

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A qualidade da dispersão de gás em células de flotação é comumente caracterizada através de parâmetros como velocidade superficial do gás (Jg), hold-up do gás (?g), distribuição de tamanho de bolha (db ou D3,2) e fluxo de superfície de bolha (Sb). Sendo um processo de separação de minerais que é dependente da interação (colisão + adesão) entre partículas hidrofóbicas e bolhas de ar, a flotação tem seu desempenho dependente de uma dispersão de gás apropriada na polpa de minério. Desta forma, este trabalho objetivou caracterizar o estado da dispersão de gás de duas células em um banco composto p

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21

Terrabuio, Luiz Alberto. "Novas investigações de propriedades elétricas realizadas por meio da teoria quântica de átomos em moléculas." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/75/75134/tde-25102017-150506/.

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Nesta tese de doutorado apresentamos os resultados de quatro tópicos referentes a estudos de propriedades elétricas que são interpretados com o auxílio da Teoria Quântica de Átomos em Moléculas (QTAIM). No primeiro deles, foram calculados momentos de dipolo e suas derivadas através de um novo formalismo de divisão de átomos em moléculas, baseado em campos de forças de Ehrenfest (CFE), sendo que estes dados são comparados com aqueles advindos da QTAIM. Desta forma, um modelo alternativo de partição em carga - fluxo de carga - fluxo de dipolo (CFCFD) é discutido para derivadas do momento dipolar

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22

Hernandez, Avila José Luis. "Etude des decharges couronne dans l'argon et l'azote, du gaz au liquide." Université Joseph Fourier (Grenoble), 1996. http://www.theses.fr/1996GRE10173.

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Ce memoire resume les travaux sur les phenomenes de conduction electrique et des mecanismes de transport que nous avons effectue pour l'argon et l'azote en fonction de la densite du fluide. Par des mesures electriques et optiques nous avons caracterise la decharge couronne en fonction de divers parametres tels que: la tension d'apparition de la decharge, les impulsions de courant, l'analyse spectroscopique de la lumiere emise. L'etude ete effectue pour des pointes de petit rayon de courbure, allant de 1 a 10 micrometres, les phenomenes dependent beaucoup de la polarite de la pointe, ainsi que

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23

Papoular, David. "Manipulation des interactions dans les gaz quantiques : approche théorique." Phd thesis, Université Paris Sud - Paris XI, 2011. http://tel.archives-ouvertes.fr/tel-00624682.

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Les interactions entre particules dans les gaz quantiques ultrafroids peuvent être contrôlées à l'aide de résonances de Fano-Feshbach. Ces résonances de diffusion se produisent lors de collisions à basse énergie entre deux atomes et sont généralement obtenues à l'aide d'un champ magnétique statique externe. Elles font des gaz atomiques ultrafroids un terrain d'exploration pour la recherche de nouvelles phases dans lesquelles la physique quantique joue un rôle clef.Le travail présenté dans ce mémoire s'inscrit dans le cadre de la recherche de telles phases.Ce manuscrit comporte deux parties. La

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24

Deuretzbacher, Frank [Verfasser]. "Spinor Tonks-Girardeau gases and ultracold molecules / vorgelegt von Frank Deuretzbacher." 2009. http://d-nb.info/993755372/34.

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25

McGuire, Joseph. "The characterization and simplex optimization of a variable-diameter, multielectrode, direct current plasma for atomic emission spectroscopy." Thesis, 1989. http://hdl.handle.net/1957/38148.

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26

SAX, JAMES E. "TRANSPORT OF SMALL MOLECULES IN POLYMER BLENDS: TRANSPORT-MORPHOLOGY RELATIONSHIPS (SORPTION, MICROSCOPY, GASES)." 1985. https://scholarworks.umass.edu/dissertations/AAI8509601.

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This thesis concerns itself with the influence of morphology on transport processes, specifically the prediction of effective diffusion coefficients of small penetrants (gases) in binary polymer blends of varying degrees of miscibility and microstructural order. Experimental results, modeling studies, and image analysis results are presented and compared. Several models are developed and critically evaluated with the help of previously published experimental data and new data obtained in this work. Completely random two-phase media are modeled in terms of Effective Medium Theory and a simple n

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27

"Studies of Polar Molecules and Spinor Gases with an Ultracold Mixture of Na and Rb Atoms." 2016. http://repository.lib.cuhk.edu.hk/en/item/cuhk-1292709.

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28

Ryu, Changhyun. "Photoassociation experiments on ultracold and quantum gases in optical lattices." Thesis, 2004. http://hdl.handle.net/2152/1254.

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29

Ryu, Changhyun Heinzen Daniel J. "Photoassociation experiments on ultracold and quantum gases in optical lattices." 2004. http://wwwlib.umi.com/cr/utexas/fullcit?p3143461.

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30

Costa, Filipe André Boiça. "Dissociative processes induced by electron impact with biologically relevant molecules." Doctoral thesis, 2021. http://hdl.handle.net/10362/116289.

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The work presented in this thesis is based on the study of electron collisions with molecules of biological interest. The primary focus is to perform electron scattering measurements with a linear transmission beam system that has been improved and tested to obtain accurate results. Along with this experimental system, other electron scattering measurements with different apparatuses are presented. Theoretical values obtained with three different calculation methods are also presented for some of the studied molecules. The scattering targets that have been the subject of this work were be

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