Laser Cooling
Mostrando 13-24 de 45 artigos, teses e dissertações.
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13. PRODUÇÃO DE PIGMENTOS INORGÂNICOS A BASE DE ZrSiO4 COM INCORPORAÇÃO DE PASTA ELETROLÍTICA DE PILHAS / PREPARATION OF INORGANIC PIGMENTS BASED ON THE ZrSiO4 OXIDE FROM A MIXTURE OF AN ELECTROLYTIC-PASTE WASTE OF ALKALINE BATTERIES AND ZrSiO4
Throughout the times, new pigment systems have been gradually developed. In the nowadays, the development of ceramic pigments represents a part of the Materials Science, where there is a lack of concepts, roles and strategies, which in goal allows the developing of new rotes of preparing or pigments, in both scientific and technological areas. This work deal
Publicado em: 2009
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14. Pulpal temperature increase with high-speed handpiece, Er:YAG laser and ultrasound tips
The aim of this study was to compare intrapulpal temperature increase produced by high-speed handpiece, Er:YAG laser and CVDentus ultrasound tips during cavity preparation. Thirty bovine mandibular incisors with an enamel/dentin thickness of 4 mm at buccal surface had their roots amputated and were allocated to the following groups (n=10): Group I- high-spee
Journal of Applied Oral Science. Publicado em: 2008-06
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15. Produção experimental de excitações topológicas em um condensado de Bose-Einstein / Experimental production of topological excitations in a Bose-Einstein condensate
Neste trabalho descrevemos a produção e estudo de excitações topológicas em um condensado de Bose-Einstein em átomos de Rubídio-87. O condensado é produzido através de resfriamento evaporativo forçado por rádio-freqüência em uma armadilha puramente magnética do tipo QUIC. A armadilha magnética é carregada por um sistema de duplo-MOT. A temper
Publicado em: 2008
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16. Laser surface remelting and hardening of an automotive shaft sing a high-power fiber laser
An automotive shaft was surface-remelted and hardened using a 2 kW fiber laser and an adapted linear axis whose rotating axis produced helical tracks at 120 RPM. The process variable was the laser power, ranging from 300 to 1100 W, which produced two regions in the material: a martensitic region (MR) and a partially transformed region (PTR). The MR is formed
Materials Research. Publicado em: 2007-12
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17. "Terapia endodôntica associada à irradiação do canal radicular com laser de diodo: avaliação térmica, morfológica, microbiológica e da infiltração marginal apical" / Endodontic root canal therapy usindg diode laser irradiation: thermographic, morphological, microbiological and marginal apical leakge studies
The aim of this study was to evaluate the effects of diode laser irradiation associated with endodontic therapy. The aspects analyzed were: temperature rise at the external root surface, morphological changes at the dentine root walls, apical marginal leakage after root sealing, and microbiological reduction after laser irradiation. The temperature rise in i
Publicado em: 2007
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18. Redução aluminotérmica do óxido de tântalo usando uma tocha de plasma como ignitor
In this work was used a plasma torch of non transferred arc with argon as work gas, using a power supply with maximum DC current of 250 A and voltage of 30 V to activate the plasma and keep it switched on. The flame temperature was characterized by optical emission spectroscopy, through Boltzmann-plot-method. The torch has been used like igniter in the alumi
Publicado em: 2007
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19. Construção de uma armadilha de dipolo com laser de CO2. / Constrution of a dipole trap using a CO2 laser
In this work we present the construction of an optical dipole trap using a CO2 laser, which involves the use of news and modern technologies never utilized by our group up to now. We have builded a new trap chamber with large optical access, used atomic dispensers as an atomic source and a high power CO2 laser and its optical components. We have demonstrated
Publicado em: 2006
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20. Cooling many particles to very low temperatures
In a recent paper [Beige, Knight, and Vitiello, quant-ph/0404160], we showed that a large number N of particles can be cooled very efficiently. The particles should be excited by red-detuned laser fields while coupling to the quantized field mode inside a resonant and leaky optical cavity. When the coupling constants are for all particles the same, a collect
Brazilian Journal of Physics. Publicado em: 2005-06
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21. Calcium magneto-optical trap loaded from a decelerated atomic beam
We describe a new system for laser cooling and trapping of neutral Calcium atoms employing the ¹S0 -¹ P1 resonant transition at 423 nm. An on-axis magneto-optical trap (MOT) is loaded from a Zeeman decelerated atomic beam. When a single laser is used, in order to avoid perturbation of the trap by the deceleration laser beam, this one has been tightly focus
Brazilian Journal of Physics. Publicado em: 2003-06
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22. Simulação numerica de tratamento superficial por refusão a laser : interação radiação laser-materia e solidificação
In this work, a two dimensional numerical modei in cylindrical coordinates based on the finite difference technique is developed pennitting the description of the thermal field evolution during heating, fusion, solidification and cooling along the laser surface treatment processo The model predictions are compared to experimental results as well as to those
Publicado em: 2003
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23. Avaliação do laser Er:YAG como condicionador de esmalte e dentina para procedimento de união a materiais resinosos
The purpose of this study was to verify: 1) the energy levei that could produce the morphologic aspect similar to dental tissues conditioned with phosphoric acid on dental tissues irradiated by Er:Y AG (Yttrium aluminium gamet Y ~L5012) laser; 2) the tension bond strength of an adhesive system applied over enamel and dentin, after pretreatment with phosphori
Publicado em: 2003
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24. Desenvolvimento de fontes laser, espectroscopia de alta resolução e resfriamento e aprisionamento magneto-optico de atomos de calcio
In this work, we report on an experimental system for laser cooling and magneto-optical trapping of calcium atoms, the development of the laser sources for this system, and a spectroscopic analysis of calcium transitions in hollow cathode electric discharges. In the case of calcium, the most efficient optical transition for the atom motion manipulation by ra
Publicado em: 2002