Rozprawy doktorskie na temat „Pulsed laser treatment”
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Koster, Petra Henriette Louise. "Analysis of portwine stain disfigurement and pulsed dye laser treatment results". [S.l. : Amsterdam : s.n.] ; Universiteit van Amsterdam [Host], 2000. http://dare.uva.nl/document/55263.
Pełny tekst źródłaPfefer, Thomas David Joshua. "Pulsed laser-induced thermal damage and the treatment of port wine stains /". Digital version accessible at:, 1999. http://wwwlib.umi.com/cr/utexas/main.
Pełny tekst źródłaSmart, J. R. "The evaluation of Port Wine Stain Haemangioma before and after treatment by pulsed dye laser". Thesis, University of Strathclyde, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.381546.
Pełny tekst źródłaHsu, Tiffany H. "In vivo occlusal caries prevention by pulsed carbon dioxide laser treatment quantified by QLF". Diss., Search in ProQuest Dissertations & Theses. UC Only, 2009. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1465481.
Pełny tekst źródłaChiu, Chun-hung, i 趙俊雄. "The role of dynamic cooling in improving clinical efficacy during pulsed dye laser treatment of port wine stain in Chinese". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2003. http://hub.hku.hk/bib/B26661482.
Pełny tekst źródłaBastos, Jaqueline Silva [UNESP]. "Reparo ósseo em scaffolds de TI6AL4V sinterizados pela tecnologia de sinterização direta de metais a laser (DMLS) submetidos a tratamento de superfície associado à aplicação de ultrassom de baixa intensidade (LIPUS)". Universidade Estadual Paulista (UNESP), 2016. http://hdl.handle.net/11449/138130.
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
O objetivo desse estudo in vivo foi verificar a resposta óssea de scaffolds porosos revestidos processados pela técnica de Sinterização Direta de Metais a laser (DMLS) associado à terapia de ultrassom de baixa intensidade. Os scaffolds foram processados empregando a técnica DMLS e tratados termicamente a 1000°C por 24 horas. Três tipos de tratamento de superfície foram avaliados: Alcalino, biomimético e imobilização de alendronato de sódio. Para o tratamento alcalino, as amostras foram imersas na solução de NaOH (5M) a 60ºC por 24 horas. O tratamento biomimético consistiu na imersão dos scaffolds em solução SBF (SimulatedBodyFluid) enquanto a imobilização do alendronato foi realizada a partir da imersão dos scaffolds em uma solução formada por SBF e medicamento durante 5 dias. As superfícies dos scaffolds foram avaliadas para cada etapa empregando microscopia eletrônica de varredura (MEV) e análise por difração de raios-X. Os scaffolds foram implantados na tíbia direita de 85 ratos machos da raça wistar com idade média de 12 semanas. A microtomografia computadorizada (µCT) e análise histológica foram realizadas para avaliar o reparo ósseo no defeito. As micrografias das superfícies obtidas mostraram mudanças no aspecto da superfície e composição química de acordo com o tratamento. O tratamento biomimético promoveu o crescimento da apatita sobre a superfície enquanto a imobilização com alendronato suprimiu sua formação. As imagens obtidas na microtomografia mostraram elevado valor de densidade óssea para o último grupo. No entanto, análises histológicas mostraram a formação de cápsula fibrosa em torno dos scaffolds a qual foi minimizada usando ultrassom pulsado de baixa intensidade. No entanto, mais estudos precisam ser realizados para avaliar a influência da geometria dos scaffolds na incorporação de medicamentos.
The objective of this in vivo study was to verify the bone response of coated Ti6Al4V porous scaffolds processed by Direct Metal Laser Sintering (DMLS) technique associated to low intensity pulsed ultrasound therapy. Scaffolds were processed by using Direct Metal Laser Sintering technique (DMLS) and heat treated at 1000 °C for 24 hours. Three types of surface treatments were evaluated: alkaline, biomimetic and sodium alendronate immobilization. For alkaline treatment, samples were immersed in a NaOH (5M) solution at 60ºC for 24 hours. Biomimetic treatment consisted in the immersion of the scaffolds into Simulated Body Fluid solution while for sodium alendronato immobilization the scaffolds were immersed in the solution formed by SBF plus drug during 5 days. The scaffolds surfaces were evaluated after each step employing SEM (Scanning Electron Microscopy)and X-rays diffraction analysis(XRD). Scaffolds were implanted into right tibia of 85 male Wistar rats with average age of 12 weeks. X-rays micro-computed tomography (µCT) and histological analysis were carried out to evaluate the bone repair on the defect. Micrographs analysis showed that the aspect of the surfaces and chemical composition changed according treatment. Biomimetic treatment promoted the growth of the apatite on the surface; in contrast the immobilization of alendronate suppressed apatite formation. Micro CT images showed higher value of bone density for the last group. However, histological analysis showed the formation of encapsulation fibrous around the scaffolds. This formation was minimized by using low intensity pulsed ultrasound technique, however, more studies can be carried out to evaluate the influence of scaffolds geometry in the drug incorporation.
Dupont, Préscillia. "Texturisation laser sélective des aciers électriques orientés et non orientés pour l'optimisation de leur perméabilité et des pertes dans les machines électriques tournantes". Electronic Thesis or Diss., Amiens, 2022. http://www.theses.fr/2022AMIE0065.
Pełny tekst źródłaSoft ferromagnetic materials, which are often used in the form of laminated sheets, compose rotating electrical machines' stators and rotors. The efficiency of those machines is reduced by losses called "iron losses", induced by magnetization mechanisms and eddy currents. Those magnetization reversal mechanisms can only be explained with the magnetic structure coupled to the material geometry, anisotropy and surface texture, which are also deterministic factors for the final electromagnetic performances. Then, present work aims at proposing tailor-made soft ferromagnetic materials by means of selective laser texturizing for electromagnetic devices such as rotating electrical machines. To apply such a process at an industrial level for grain-oriented and non-grain-oriented materials in electrical machines, it is necessary to better control the associated technology and specify the process in order to optimize electromagnetic properties. Indeed, the deterministic impact of this technic on a material's magnetic structure and its performances (magnetic permeability and iron losses) remains partially modelled and understood. The integration of such solution at the industrial scale must be analyzed and optimized regarding technical and economical constraints. In this work, the study of the impact of laser surface texturizing on magnetic structure (regarding surface and volume) of a material with the aim to control it is performed. Future industrialization requires to adapt the pulsed laser processes at a higher speed which has been theoretically studied, initiated and experimentally verified. To finish, present work performed in parallel with the H2020 European project ESSIAL will allow to propose different surface treatments adapted to rotating machines to adjust some quantifiable electromagnetic properties with the help of both experimental and theoretical tools
Pacquentin, Wilfried. "Contribution à l'étude des propriétés physico-chimiques des surfaces modifiées par traitement laser : application à l'amélioration de la résistance à la corrosion localisée des aciers inoxydables". Phd thesis, Université de Bourgogne, 2011. http://tel.archives-ouvertes.fr/tel-00676332.
Pełny tekst źródłaNOGUEIRA, ALESSANDRO F. "Texturização em superfícies de titânio grau 2 irradiadas com laser de pulsos ultracurtos". reponame:Repositório Institucional do IPEN, 2015. http://repositorio.ipen.br:8080/xmlui/handle/123456789/23740.
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Dissertação (Mestrado em Tecnologia Nuclear)
IPEN/D
Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
SILVA, LUCIANA V. da. "Estudos dos mecanismos envolvidos em processos de endurecimento superficial a laser de ligas a base de aluminio". reponame:Repositório Institucional do IPEN, 2011. http://repositorio.ipen.br:8080/xmlui/handle/123456789/9634.
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Dissertacao (Mestrado)
IPEN/D
Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
FOURNIER, JEAN. "Generation d'ondes de choc par laser pulse de forte energie : applications mecaniques et metallurgiques". Palaiseau, École polytechnique, 1989. http://www.theses.fr/1989EPXX0007.
Pełny tekst źródłaNesser, Manar. "Influence of laser treatment with long, short, or ultra-short pulse duration on the magnetic properties and the domain structure of grain-oriented Iron-Silicon steels". Electronic Thesis or Diss., Amiens, 2021. http://www.theses.fr/2021AMIE0026.
Pełny tekst źródłaPulsed laser technology is one of the productive solutions adopted to optimize the electromagnetic properties of certain electrical steels. However, its industrial application on different alloys, thicknesses, or applications remains restricted. Moreover, the deterministic impact of this technique on the magnetic structure of a material and its performance requires deep investigation. Further, the ultra-short pulsed laser ablation technique remains unfamiliar for electrical steels although it represents a vital potential in terms of a repeatable process that withstands high temperatures. The main intention of the thesis is to study the influence of surface laser treatments on the magnetic properties of grain-oriented silicon iron electrical steels in order to improve their performance. A classification of the different laser processes is proposed according to the pulse duration, repetition frequency, power, and laser fluence. Accordingly, three types of treatments are selected: irradiation, scribing, and ablation, with a particular emphasis on the ablation process. Remarkably, the principal criterion analyzed was the energy conversion efficiency (i.e. especially iron losses). On that account, the impact of these laser processes is studied using dynamic magnetization and loss models, identified by magnetic measurements with an SST "Single Sheet Tester" bench. Then, an optimization of the laser ablation parameters is carried out to ensure a reduction in iron losses of around 20% while maintaining the apparent permeability at certain operating points (medium and high inductions at 50 Hz and low inductions up to 5000 Hz). An additional study on two different grades of FeSi GO (conventional 0.23 mm and HiB 0.28 mm) permitted the adaptation of the laser parameters and patterns with the material thickness. Spectacularly, the ablation process has shown more resistance to a higher temperature than other processes. Furthermore, a correlation between the optical energy parameters (pulse energy, cumulative energy density, and peak power density), the patterns and laser impacts (groove depth, heat affected zone, induced thermal stress), and the identified magnetic parameters (Bertotti coefficients; Lambda model parameters) is presented. This study reveals some physical interpretations.Besides, the effect of surface laser treatments on the magnetic domain structure has been analyzed. We visualized the changes in magnetic domains with Magneto-optical images using the MOIF technique (Magneto-Optical Indicator Film) for an overview of the domains between the laser lines with a resolution of about 20 µm. Following this, more precise observations with a horizontal resolution of the order of 100 nm were performed using the Magnetic Force Microscope (MFM), which shows the structural details in the vicinity and in the laser tracing line. To conclude, an optimization of the laser ablation parameters is accomplished ensuring an iron loss reduction at 50 Hz with more than 30% for an induction 0.5 T, and a percentage of 15% for an induction above 1.5 T. At higher frequencies and for 0.1 T, the reduction percentage can exceed the 30%. Concurrently, the apparent permeability can either be enhanced below 1.2 T (saturation inclination) or slightly reduced between 1.2 T and saturation. Anyhow, the polarization J800 > 1.70 T (conventional GO) and J800 > 1.80 T (GO HiB) under a magnetic field of 800 A/m will be guaranteed after laser treatment
AGUIAR, AMANDA A. "Avaliação do recobrimento biomimético em compósitos de alumina-zircônia texturizadas superficialmente com laser de femtossegundo". reponame:Repositório Institucional do IPEN, 2013. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10203.
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Tese (Doutoramento)
IPEN/T
Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
Zou, Long. "Simulation of laser energy deposition with structured light beams in air and machine learning data treatment for LIBS analysis of remote targets". Electronic Thesis or Diss., Institut polytechnique de Paris, 2023. http://www.theses.fr/2023IPPAX053.
Pełny tekst źródłaThe propagation of ultrashort and ultra-intense laser pulses in the atmosphere is increasingly studied.Precise control of the focusing of the laser field and the distribution of light filaments extending beyond the focus is required for many applications, such as the Mars exploration mission on the analysis of chemical elements using Laser Induced Breakdown Spectroscopy (LIBS), the analysis of the composition of air by Light Detection and Ranging (LIDAR) techniques, the triggering and guiding of electric discharges between clouds, or the generation of white light laser by filamentation. A quantitative control of the light pulse properties is very difficult due to the complex nonlinear interaction between the intense laser pulse and the medium. At present, commonly used methods rely on the parameter control of the initial laser output and the feedback of the field at the target position. The high-dimension of the parameter space and the high sensitivity of the results to the initial conditions make the adjustment of the laser field outside the laboratory difficult and inefficient to meet the requirements of practical applications.In this context, this thesis proposes an answer to some of the challenges of long-range femtosecond laser pulse propagation, based on laser pulse modulation scenarios that guarantee to reach an on-target laser field with the desired properties. These scenarios were obtained by combining reverse engineering methods and numerical simulations. We show that different target fields can be easily and efficiently achieved by modulating the laser output field. Whenever possible, the modulation is obtained by simulating the reverse propagation of the target field towards the laser.This thesis focuses on two different objectives of laser field control: the long-range projection in the air of (1) a filament of predefined length, and (2) high intensity.(1) To achieve the first objective, one of the innovations of this thesis consists in introducing a controllable intermediate Bessel-Gauss beam close to the target, and in using a numerical algorithm to propagate this electric field forward in order to obtain the distribution of the filaments at the target point as well as back-propagate the intermediate field to obtain the desired laser output. The obtained laser output parameters are then related to filament features (starting point, length, density), providing a map for the key parameters defining the modulated laser pulse that can be projected onto the desired target field and filament.(2) For the objective of transmitting high intensities at kilometric distances, we examine the nonlinear propagation of circular Airy beams and show that a laser power of a few tens of GW is sufficient to ionize the air and form a short filament at a distance of 1 km, which could facilitate laser operating conditions compared to TW-class lasers used in conventional solutions to project high intensities at these distances.In a separate study, we propose an improvement of the elemental analysis algorithm of LIBS spectrum. The algorithm is applied to the extit{in situ} online detection of KCl and H[dollar]_2[dollar]O content in potash fertilizer by LIBS, in which correlation regression modeling of LIBS spectra is combined with a machine learning algorithm that efficiently extracts the information related to elemental content changes from the complex online collected spectra, which greatly improves the detection speed while ensuring the detection accuracy and further enhances the competitiveness
Lan, Yin-Te, i 藍尹德. "Study of PEDOT:PSS Thermal Treatment by CO2 Pulsed Laser". Thesis, 2018. http://ndltd.ncl.edu.tw/handle/hdbqf2.
Pełny tekst źródła國立臺灣大學
機械工程學研究所
106
In this study, the PEDOT:PSS (CLEVIOS™ HIL-E 100 from Heraeuse) films coated on glass substrate was treated by CO2 pulsed laser in the air. The property of the PEDOT:PSS was investigated by in-line four-point probe array, spectrophotometry, AFM, SEM, and XPS. Through manipulating the fluence and the scan speed of the laser, the change in PEDOT:PSS property induced by CO2 pulsed laser was analyzed. The conductivity of the film was enhanced from 2.83E-02 S/cm to 59.4 S/cm in 181 seconds as a result of the remove of the residual water. Meanwhile, the average transmittance decreased from 89.1219 % to 88.4766 %, and the RMS roughness increased from 2.27 nm to 2.49 nm. The conductivity enhancement might be caused by the reunion between PEDOT:PSS moleculars, and the rise in the surface PEDOT/PSS ratio as investigated by SEM and XPS. However, when the laser power excess the durability of PEDOT:PSS, some significant decrease in conductivity and transmittance was observed. Compared with the hotplate thermal traetment in the air, which can not significantly increase the conductivity of PEDOT:PSS, it is found that CO2 pulsed laser thermal treatment have advantages in PEDOT:PSS thermal treatment in small area without air controled. In this study, a promising method of heat treatment for PEDOT:PSS is investigated. The conductivity of PEDOT:PSS is enhanced to 59.4 S/cm in air by CO2 Laser, which is much better than hotplate. With the advantage of selective treatment, the heat can be controled for more complicated electrical stucture in the future.
Tzung, Tien-Yi, i 宗天一. "Decision Factors in Patients Receiving Cutaneous Laser and Intense Pulsed Light Treatment for Aesthetic Purposes". Thesis, 2005. http://ndltd.ncl.edu.tw/handle/93384603138631147950.
Pełny tekst źródła國立中山大學
高階經營碩士班
93
Cutaneous laser and intense pulsed light treatments are two of the most popular aesthetic treatment modalities. More and more physicians regardless of their training background are providing such profitable services because there is still no regulation on the cosmetic procedures a physician can perform. The purpose of the present study was to find out the relative strength and weakness of different medical specialties in providing laser and intense pulsed light treatment. Major decision factors for physician selection were extracted from 19 physician choice criteria with factor analysis. Using analytic hierarchy process, the relative weight of these factors and that of dermatologists, plastic surgeons and aesthetic practitioners in each factor were calculated. After reading the training curricula of dermatologists and plastic surgeons, respondents were asked to rate again the 3 medical specialties. Our results indicated that medical competence (0.3296) was the most important major decision factor followed by recommendation (0.2198), friendliness (0.1350), cost (0.1307), complete service (0.0984) and physical attribute of the physician (0.0865). Compared with plastic surgeons and aesthetic practitioners, dermatologists had an advantage in all factors except complete service, which was the strength of plastic surgeons. New patients, aged under 40, with a college degree and a monthly allowance less than 20000 NTD were more likely to change their rating in favor of dermatologists after reading the curriculum profile..
Chueh-Kuei, Jan, i 詹爵魁. "Characteristics of Pulsed-Laser Deposition (Pb0.6Sr0.4)TiO3 Thin Films with Low Thermal Budget Post Treatment". Thesis, 2003. http://ndltd.ncl.edu.tw/handle/85786501585430724757.
Pełny tekst źródła國立交通大學
電子工程系
91
Since high temperature post-annealing for ferroelectric materials was usually required to get the fine crystallinity and ferroelectric characteristics. But many trouble issues was induced by the high thermal budget, such as the inter-diffusion of ferroelectric and substrate, and the deformation of junction profile etc. Therefore it is essential for the reduction of post-annealing temperature in order to make the ferroelectric material compatible the Si-base fabrication process. In this these, low temperature and low thermal budget for fabrication and post-annealing methods are introduced in this thesis. The (Pb,Sr)TiO3 (PST) ferroelectric material with low crystallization temperature was deposited onto the Pt/Ti/Ox/Si substrate for the research of capacitor type 1T-FeRAM. The PST thin film was fabricated by pulse-laser-deposition (PLD) method at low substrate temperature 200oC. At first, the results of conventional post annealing methods (Rapid Thermal Annealing (RTA), Furnace Annealing (FA) were acquired, witch surface cracks and interface lift were found by lager thermal stress. Therefore, novel post-treatment for Excimer Laser Annealing (ELA) method was introduced to suppress the above troubles. The PST thin films were irradiated with conditions of different laser energy density and shot number at low substrate temperature 300oC. The improvement of ferroelectric characteristic was apparently observed from electrical measurement and physical analysis, and it is further inferred that the crystallization phenomenon was occurred only on the surface region. The better improvement for crystallinity was found by appropriate control of laser energy density and shot number. Besides the larger improvement on crystallinity and characteristic of whole thin film were obtained with the combination of ELA and RTA post-treatment. The fine reliability properties for PST thin film with treatment of combination of ELA and RTA method were acquired after Fatigue, Imprint, and TDDB tests. Finally, the better crystallization and ferroelectric characteristic of the whole PST thin film treatments had been successfully achieved under low temperature post-treatment, and it is excellent for the most promising candidate in capacitor type 1T-FeRAM applications.
Hashem, Mjed H. "Laser Based Pre-treatment of Secondary Bonded Composite T-joints for Improved Energy Dissipation". Thesis, 2021. http://hdl.handle.net/10754/669124.
Pełny tekst źródłaHashem, Mjed H. "Laser Based Pre-treatment of Secondary Bonded Composite T-joints for Improved Energy Dissipation". Thesis, 2004. http://hdl.handle.net/10754/669124.
Pełny tekst źródłaLin, Sheng-Chi, i 林聖棋. "Interaction of Pulsed Lasers andTissues in Tissue Treatments". Thesis, 2003. http://ndltd.ncl.edu.tw/handle/35422621493480599523.
Pełny tekst źródła國立中央大學
機械工程研究所
91
The physical processes of laser-tissue interactions are investigated theoretically. The radiative transfer equation (RTE) is used to simulate the laser propagation in tissues. The model includes emission, absorption and anisotropic scattering mechanisms. The RTE is solved by using the discrete — ordinates method. The energy equation is solved by the control volume based finite different method. The resulting numerical code, written in Fortran, is validated by comparing the results with available experimental measurements. The effects of several important parameters on the coagulation and ablation depths of tissue are studied. Results show that the ablation depth increases with the incidence fluence. The pulse frequency of the laser has small influence on the ablation depth. On the other hand, the ablation depth is not affected by t he pulse duration. Laser energy lasers are also used in thermal treatment of skins. In this work, skins are separated into four layers, namely, stratum corneum, epidermis, dermis, and subcutaneous tissue. The results show that, under laser irradiation, the temperature difference between the skin surface and the dermis layer is very large. For better control of affected area, appropriate pulse duration should be used. For applications in photodynamic therapy (PDT), the energy distribution in tissue during the treatment period is investigated. Increasing the absorption coefficient of the tumor leads to higher energy density in the tumor region, this is beneficial fort PDT. The effective attenuation coefficient of the surrounding tissue has profound in influence on the treatment results.
"Cardiovascular Response to Vertebral Osteopathic Manipulative Treatment (OMT), On Asymptomatic Human Subjects". Master's thesis, 2014. http://hdl.handle.net/2286/R.I.27492.
Pełny tekst źródłaDissertation/Thesis
Masters Thesis Bioengineering 2014