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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
41

Interaction of 157-nm excimer laser light with fused silica, polytertrafluoroethylene and calcium fluoride

George, Sharon Rose. January 2010 (has links) (PDF)
Thesis (Ph. D.)--Washington State University, May 2010. / Title from PDF title page (viewed on June 22, 2010). "Department of Physics and Astronomy." Includes bibliographical references.
42

Current understanding of cutaneous laser treatment : a need for improved outcome and objective methods of assessing results /

McGill, David J. January 2008 (has links)
Thesis (Ph.D.)--Aberdeen University, 2008. / Title from web page (viewed on Mar. 2, 2009). With: The effect of ambient temperature on capillary vascular malformations / D.J. McGill, I.R. Mackay. British journal of dermatology. 2006: 154, 896-903. With: Capillary vascular malformation response to increased ambient temperature is dependent upon anatomical location / David J. McGill, Iain R. Mackay. Annals of plastic surgery. 2007: 58, 2, 193-199. With: A direct comparison of Pulsed dye, Alexandrite, KTP and ND: YAG lasers and IPL in patients with previously treated capillary malformation / Davis J. McGill, William MacLaren, Iain R. Mackay. Lasers in surgery and medicine. 2008: 9999, 1-9. With: A randomized split-face comparison of facial hair removal with Alexandrite Laser and Intense Pulsed Light System / D.J. McGill ... et al. Lasers in Surgery and medicine. 2007: 39, 767-772. With: Laser hair removal in women with polycystic ovary syndrome / D.J. McGill ... et al. Journal of plastic, reconstructive & aesthetic surgery. 2007: 60, 426-431. Assessment of burn depth : a prospective, blinded comparison of laser Doppler imaging and videomicroscopy / D.J. McGill ... et al. Burns. 2007: 33, 833-842. Includes bibliographical references.
43

A study of water induced Er:YAG laser ablation of dental hard tissue

Kwon, Yonghoon, January 1997 (has links)
Thesis (Ph. D.)--Texas A & M University, 1997. / "Major Subject: Bioengineering." Includes bibliographical references.
44

Interactions of infrared lasers with dental hard tissues at clinically relevant wavelengths

Zuerlein, Michael J., January 1999 (has links)
Thesis (Ph. D.)--University of California, San Francisco, 1999. / eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.
45

Dye laser and chemical laser studies of chemical reaction dynamics

Reddy, Kammalathinna Virupaksha. January 1900 (has links)
Thesis--Wisconsin. / Vita. Includes bibliographical references (leaves 191-203).
46

Multi-component defect model for semiconductor lasers /

Lam, Samuel Kar Kin. Cassidy, Daniel Thomas. January 2003 (has links)
Thesis (Ph.D.)--McMaster University, 2004. / Advisor: D. T. Cassidy. Includes bibliographical references (p. 112-116). Also available online.
47

Desenvolvimento de um laser de estado solido de Nd:YLF

AMARAL NETO, RUBENS do 09 October 2014 (has links)
Made available in DSpace on 2014-10-09T12:31:58Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T13:57:27Z (GMT). No. of bitstreams: 1 02282.pdf: 2159976 bytes, checksum: 893484979cc7d00b7aa07ebf8a528559 (MD5) / Dissertacao (Mestrado) / IPEN/D / Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
48

Resistência de união ao microcisalhamento de sistemas adesivos autocondicionates com graus de acidez distintos : efeito de diferentes tratamentos em substrato dentinário normal e hipermineralizado artificialmente/

Piccioni, Máyra Andressa Rodrigues Valinhos. January 2014 (has links)
Orientador: José Roberto Cury Saad / Banca: Edson Alves de Campos / Banca: Marcelo Ferrarezi de Andrade / Banca: Cristina Magnani Felício / Banca: Patricia Aleixo dos Santos / Resumo: O objetivo deste trabalho, dividido em três estudos: foi avaliar a resistência de união de diferentes sistemas adesivos autocondicionantes, com graus de acidez distintos, frente a diferentes tratamentos dentinários: condicionamento ácido, laser e ponta diamantada em dentina normal e hipermineralizada artificialmente. No primeiro estudo, foi realizada uma busca na literatura sobre o uso do laser Er;Cr:YSGG na Odontologia Restauradora. Nos segundo e terceiro, duzentos e vinte e quatro (n = 224) molares humanos hígidos foram selecionados. Os dentes tiveram seu terço oclusal seccionado com o objetivo de expor superfície dentinária plana e foram lixados para a exposição de uma superfície dentinária uniforme e "padronizada". Os espécimes foram divididos aleatoriamente em dois diferentes grupos, de acordo com o tipo de dentina: normal (N/n=108) e hipermineralizada artificialmente (H/ n=116). O grupo H recebeu tratamento para hipermineralização e oito dentes foram selecionados aleatoriamente e observados em MEV para a confirmação do procedimento de hipermineralização. Os dentes de cada grupo foram divididos aleatoriamente em quatro diferentes subgrupos, de acordo com o sistema adesivo autocondicionante empregado: Clearfil S3 Bond e Optibond All in One - Passo único - (Artigo 2); Clearfil SE Bond e Adhese - Dois Passos - (Artigo 3). Cada subgrupo (n=9) recebeu diferentes tratamentos: (1) condicionamento convencional: aplicação do sistema adesivo autocondicionante segundo recomendações do fabricante; (2) condicionamento da superfície dentinária com laser Er,Cr:YSGG (Waterlase Millennium, Biolaser Technology, San Clement, CA, USA) + aplicação do sistema adesivo segundo recomendações do fabricante; (3) "asperização" da superfície dentinária com ponta diamantada 3098 + aplicação do sistema adesivo segundo recomendações do fabricante. Em seguida, matrizes transparentes... / Abstract: The aim this work, divided in three studies, was evaluate the bond strength of different adhesive systems with different degrees of acidity, to different dentinal treatments: acid etching, laser and diamond bur in normal dentin and artificially hypermineralized dentin. In the first study, it was performed a literature review on the use of the Er,Cr : YSGG in Restorative Dentistry. In the second and third, two hundred twenty-four (n = 224) human molars were selected. The teeth had their third occlusal sectioned in order to expose flat dentin surface and it were ground to expose dentin surface uniform, " standardized". The specimens were randomly divided into two groups according to the type of dentin normal (N /n = 108) and artificially hypermineralized (H / n = 116) . The group H received treatment for hypermineralization and eight teeth were randomly selected and observed by SEM to confirm the hypermineralization procedure. The teeth of each group were randomly divided into four different subgroups, according to the adhesive system used: Clearfil S3 Bond and Optibond All in One - One step- (Article 2 ); Clearfil SE Bond and AdheSE - Two steps - (Article 3). Each subgroup (n = 9) received different treatments: (1) conventional conditioning : application of the adhesive system according to the manufacturer's recommendations, (2) conditioning of the dentin surface with Er,Cr:YSGG laser (Waterlase Millennium Biolaser Technology, San Clement, CA, USA) + adhesive system according to the recommendations of the manufacturer, (3) " roughening " of the dentin surface with a diamond tip 3098 + adhesive system according to the recommendations of the manufacturer. Then, cylindrical transparent molds were placed on the dentin surface treated with the adhesives and were filled with composite resin (Z350 XT FiltekTM - 3M ESPE) and light-cured for 40s. The molds were removed to expose the composite resin cylind... / Doutor
49

Desenvolvimento de um laser de estado solido de Nd:YLF

AMARAL NETO, RUBENS do 09 October 2014 (has links)
Made available in DSpace on 2014-10-09T12:31:58Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T13:57:27Z (GMT). No. of bitstreams: 1 02282.pdf: 2159976 bytes, checksum: 893484979cc7d00b7aa07ebf8a528559 (MD5) / Dissertacao (Mestrado) / IPEN/D / Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
50

Estudo de fenômenos ultra-rápidos

Miranda, Rubens da Silva 13 June 1989 (has links)
Orientadores: Marco Antonio Fiori Scarparo, Carlos Henrique Brito Cruz / Tese (doutorado) - Universidade Estadual de Campinas, Instituto de Fisica Gleb Wataghin / Made available in DSpace on 2018-07-15T05:08:05Z (GMT). No. of bitstreams: 1 Miranda_RubensdaSilva_D.pdf: 5194284 bytes, checksum: c4262fc2b53c3184a7795d034e6d2135 (MD5) Previous issue date: 1989 / Resumo: No presente trabalho, o processo de geração de pulsos laser ultra-curtos em uma cavidade do tipo "colliding pulse mode-locked" foi estudado. Um modelo foi desenvolvido para explicar como uma varredura de frequência é gerada no pulso durante a propagação deste em um absorvedor saturável. Utilizando-se este laser, o tempo de termalização de portadores quentes em um filme de CdSe eletrodepositado foi medido através da técnica de excitação e prova. O tempo medido variou de 300 fs a 1.5 ps para uma correspondente variação da densidade de portadores injetados de 6 x 1016 cm -3 a 4.7 x 1018 com -3. Para explicar os dados experimentais, um modelo foi proposto. Esse modelo inclui os efeitos de "screening" da interação coulombiana e de alargamento da linha de distribuição espectral dos elétrons, que aumenta com a taxa de espalhamento portador-portador / Abstract: In this work process of ultrashort light pulses generation from a colliding pulse modelocked laser was studied. A model was developed wick explains how a frequency sweep is generated in the pulse on propagation through the saturable absorber. Using this laser, the hot carrier thermalization time in a electrodeposited CdSe film was measured in a pump and probe experiment as well. This time was found to vary from 300 fs to 1.5 ps as the density of injected carriers increased from 6 x 1016 cm-3 to 4,7 x 1018cm-3. To describe our data a model was proposed. This model includes sreening of the Coulomb interaction and line broadening of the spectral distribution of electrons which increases with the carrier-carrier scattering rate / Doutorado / Física / Doutor em Ciências

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