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You searched for subject:(Bubble chambers). Showing records 1 – 3 of 3 total matches.

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University of New South Wales

1. Lee, Ivy Ai Ling. Studies in an externally irradiated immobilized catalyst bubble column photoreactor: mass transfer and activity evaluation.

Degree: Chemical Sciences & Engineering, 2007, University of New South Wales

Light intensity distribution studies in the heterogeneous photocatalytic reactors were carried out successfully with potassium ferrioxalate chemical actinometry, reproducible light intensity estimates of the irradiation source were obtained. The increased light intensity in the reactor system increased the absorption as determined by actinometry. It was found that reflectivity was a dependent variable but mesh opening area was an independent variable.The photocatalytic mineralization of dichoroacetic acid DCAA, in the presence of TiO2 immobilized on a plate in an externally irradiated bubble column photoreactor had been investigated. The mass transfer and activity evaluation were measured. It was found that increasing the catalyst thickness, increased the photoactivity until it reaches the optimum loading, further loading increase caused the reaction rate to remain constant. This phenomenon was observed with increased lamp power (intensity) and initial solute concentration. However, the catalyst activity was not influenced by the increasing concentration of dissolved oxygen. The reaction rate for DCAA photomineralization was expressed using the Langmuir-Hinsheldwood model.

Subjects/Keywords: Bubble chambers; Plate towers; Chemical kinetics; Heterogeneous catalysis

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APA (6th Edition):

Lee, I. A. L. (2007). Studies in an externally irradiated immobilized catalyst bubble column photoreactor: mass transfer and activity evaluation. (Masters Thesis). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/40828 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:1477/SOURCE02?view=true

Chicago Manual of Style (16th Edition):

Lee, Ivy Ai Ling. “Studies in an externally irradiated immobilized catalyst bubble column photoreactor: mass transfer and activity evaluation.” 2007. Masters Thesis, University of New South Wales. Accessed December 11, 2019. http://handle.unsw.edu.au/1959.4/40828 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:1477/SOURCE02?view=true.

MLA Handbook (7th Edition):

Lee, Ivy Ai Ling. “Studies in an externally irradiated immobilized catalyst bubble column photoreactor: mass transfer and activity evaluation.” 2007. Web. 11 Dec 2019.

Vancouver:

Lee IAL. Studies in an externally irradiated immobilized catalyst bubble column photoreactor: mass transfer and activity evaluation. [Internet] [Masters thesis]. University of New South Wales; 2007. [cited 2019 Dec 11]. Available from: http://handle.unsw.edu.au/1959.4/40828 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:1477/SOURCE02?view=true.

Council of Science Editors:

Lee IAL. Studies in an externally irradiated immobilized catalyst bubble column photoreactor: mass transfer and activity evaluation. [Masters Thesis]. University of New South Wales; 2007. Available from: http://handle.unsw.edu.au/1959.4/40828 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:1477/SOURCE02?view=true

2. Burch, Benjamin Paul. Galactic Dark Matter.

Degree: PhD, Physics, 2013, Washington University in St. Louis

The precise phase-space distribution and properties of Galactic dark matter necessary for its direct and indirect detection are currently unknown. Since the distributions of normal and dark matter in the Milky Way are coupled to each other as they both move in the same gravitational potential, constraints on the distribution and properties of dark matter can be derived by studying the distribution of visible matter in the Galaxy and making some general assumptions regarding the phase-space distribution of the dark matter. In this study, the visible components of the Galaxy have been comprehensively reviewed to create an axisymmetric model of the Galaxy that is consistent with the available observations, and the dark matter phase-space distribution is assumed to follow a lowered-isothermal form. Poisson's equations are then solved self-consistently to construct models of the spatial and velocity distribution of Galactic dark matter. The total gravitational potential from normal and dark matter are calculated and compared to the current observations of the rotation curve and to the radial velocity distributions of blue horizontal-branch and blue straggler stars. It is found that this analysis allows for a wide range of parameters for the dark matter. The implications for direct and indirect detection of dark matter are discussed in detail. In the appendices, two additional projects are presented. In Appendix A, the recent observations of the positron fraction and the total electron spectrum in cosmic rays are addressed by considering a nested leaky-box model for the propagation of cosmic rays in the Galaxy. This is found to obviate the need for exotic processes such as the annihilation or decay of dark matter to explain the recent observations. In Appendix B, we discuss a novel dark matter detector involving triggered cavitation in acoustic fields. The theory behind the detector is presented in detail, and we discuss the work than has been done to create a prototype at Washington University. Advisors/Committee Members: Ramanath Cowsik.

Subjects/Keywords: Bubble Chambers; Cosmic Rays; Dark Matter; Dynamical Models; Galactic Dynamics; Milky Way

…Experimental results from ultrasonic bubble chambers for many liquids are shown. The expected… …This figure is taken from [22]. . . . . . . . . . . . B.7 The minimum bubble radius… …of Rayleigh collapse and heating. The bubble grows thanks to rectified diffusion to the… …is taken from [22]. . . . . . . . . . . . . . B.11 Spectrum of single-bubble… …B.12 The spectrum from multi-bubble sonoluminescence (thin line) and singebubble… 

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APA (6th Edition):

Burch, B. P. (2013). Galactic Dark Matter. (Doctoral Dissertation). Washington University in St. Louis. Retrieved from https://openscholarship.wustl.edu/etd/1124

Chicago Manual of Style (16th Edition):

Burch, Benjamin Paul. “Galactic Dark Matter.” 2013. Doctoral Dissertation, Washington University in St. Louis. Accessed December 11, 2019. https://openscholarship.wustl.edu/etd/1124.

MLA Handbook (7th Edition):

Burch, Benjamin Paul. “Galactic Dark Matter.” 2013. Web. 11 Dec 2019.

Vancouver:

Burch BP. Galactic Dark Matter. [Internet] [Doctoral dissertation]. Washington University in St. Louis; 2013. [cited 2019 Dec 11]. Available from: https://openscholarship.wustl.edu/etd/1124.

Council of Science Editors:

Burch BP. Galactic Dark Matter. [Doctoral Dissertation]. Washington University in St. Louis; 2013. Available from: https://openscholarship.wustl.edu/etd/1124

3. Bitlloch Puigvert, Pau. Turbulent bubble suspensions and crystal growth in microgravity. Drop tower experiments and numerical simulations.

Degree: Departament d'Estructura i Constituents de la Matèria, 2012, Universitat de Barcelona

En la present tesi s’estudia, en primer lloc, la formació d’un doll turbulent de bombolles en condicions de microgravetat. Aquest ha sigut analitzat a partir del tractament de les gravacions obtingudes per altres investigadors en experiments de microgravetat. Els resultats s’han comparat amb un model simplificat de bombolles passives, en el que aquestes són arrossegades pel flux mitjà i, simultàniament, són dispersades degut al grau local de turbulència a cada punt. Gràcies a la experiència obtinguda en aquest anàlisi, s’ha dissenyat un nou experiment que ha sigut utilitzat en 36 llançaments de la torre de caiguda de 4.7 segons del ZARM (“Centre de Tecnologia Espacial Aplicada i Microgravetat”) a Bremen. Amb aquest experiment s’ha aconseguit, per primera vegada a la història, una suspensió monodispersa de bombolles, en el sí d’un flux turbulent, en condicions de microgravetat. A partir dels resultats obtinguts, s’ha caracteritzat per primera vegada el temps de relaxació de la pseudo-turulència (generada prèviament degut a l’efecte de les forces de flotació sobre les bombolles injectades en gravetat normal). També s’ha estudiat l’efecte causat per les bombolles en el medi turbulent. Els resultats han sigut comparats amb simulacions realitzades mitjançant el model de Lattice-Boltzmann. Per altra banda, s’ha estudiat també l’efecte que tenen les vibracions gravitatòries residuals sobre la qualitat de semiconductors solidificats en microgravetat. S’ha analitzat la qualitat dels cristalls resultants a partir de l’estudi de les inhomogeneïtats en la concentració de dopant. Aquest estudi ha sigut realitzat íntegrament a base de simulacions, però s’han establert els paràmetres dominants del soroll gravitatori a partir de valors mesurats en missions espacials reals. Advisors/Committee Members: [email protected] (authoremail), false (authoremailshow), Casademunt i Viader, Jaume (director), Ruiz, Xavier (Ruiz Martí) (director), true (authorsendemail).

Subjects/Keywords: Ambients de microgravetat; Medio ambientes de gravedad reducida; Reduced gravity environments; Cambres de bombolles; Cámaras de burbujas; Bubble chambers; Turbulència; Turbulencia; Turbulence; Solidificació; Solidificación; Solidification; Solidificació tipus Bridgman; Solidificación tipo Bridgman; Bridgman style solidification; Ciències Experimentals i Matemàtiques; 539

…iv CONTENTS 3 Turbulent bubble jets 35 3.1 Introduction… …of bubble jets . . . . . . . . . . . . . . . . . . . 52 3.7 Experimental results on the… …66 4 Bubble suspensions in turbulent duct flows 69 4.1 Introduction… …Statistical analysis . . . . . . . . . . . . . . . . . . . . . . 87 4.4.3 Statistics of bubble… …conditions to achieve the simplest possible bubble dispersions, aiming at uniform sizes of bubbles… 

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Bitlloch Puigvert, P. (2012). Turbulent bubble suspensions and crystal growth in microgravity. Drop tower experiments and numerical simulations. (Thesis). Universitat de Barcelona. Retrieved from http://hdl.handle.net/10803/96295

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Bitlloch Puigvert, Pau. “Turbulent bubble suspensions and crystal growth in microgravity. Drop tower experiments and numerical simulations.” 2012. Thesis, Universitat de Barcelona. Accessed December 11, 2019. http://hdl.handle.net/10803/96295.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Bitlloch Puigvert, Pau. “Turbulent bubble suspensions and crystal growth in microgravity. Drop tower experiments and numerical simulations.” 2012. Web. 11 Dec 2019.

Vancouver:

Bitlloch Puigvert P. Turbulent bubble suspensions and crystal growth in microgravity. Drop tower experiments and numerical simulations. [Internet] [Thesis]. Universitat de Barcelona; 2012. [cited 2019 Dec 11]. Available from: http://hdl.handle.net/10803/96295.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Bitlloch Puigvert P. Turbulent bubble suspensions and crystal growth in microgravity. Drop tower experiments and numerical simulations. [Thesis]. Universitat de Barcelona; 2012. Available from: http://hdl.handle.net/10803/96295

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

.