Random Laser
Mostrando 1-12 de 44 artigos, teses e dissertações.
-
1. Prevalence and risk factors of incidental prostate cancer in certain surgeries for benign prostatic hyperplasia: A systematic review and meta-analysis
ABSTRACT Background: This study aimed to explore the prevalence and clinical risk factors in patients diagnosed with incidental prostate cancer (IPC) during certain surgeries (transurethral resection of the prostate [TURP], open prostatectomy [OP], and holmium laser enucleation of the prostate [HoLEP]) after clinically suspected benign prostatic hyperplasia
International braz j urol. Publicado em: 2022
-
2. REFINAMENTO GEOMÉTRICO DE CONTORNOS E CUMEEIRAS DE TELHADOS DE EDIFÍCIOS EXTRAÍDOS DE DADOS LASER COM USO DE IMAGEM AÉREA
Nesse artigo é proposto um método para refinar geometricamente telhados 3D extraídos dos dados LASER com o uso de uma imagem aérea de alta-resolução e modelos de campo aleatório de Markov (MRF - Markov Random Field).Para tanto, uma descrição MRF para agrupamento de retas é desenvolvida, assumindo que cada lado de contorno e cumeeira projetado está
Bol. Ciênc. Geod.. Publicado em: 2014-09
-
3. Laser a base de pó de neodímio com granulação nanométrica / Powder neodymium laser with nanometric granulation
O interesse na pesquisa de Lasers randômicos, meios dispersivos com alto ganho, tem crescido nos últimos anos em virtude das novas possibilidades advindas ao se trabalhar com estes sistemas, como emissões em bandas com baixo ganho, bicromaticidade, localização da luz em meios difusos e sistemas ópticos mais compactos. Nesse trabalho serão discutidos t
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 01/07/2011
-
4. Contribuições para a análise de sinais neuronais e biomédicos
Following the new tendency of interdisciplinarity of modern science, a new field called neuroengineering has come to light in the last decades. After 2000, scientific journals and conferences all around the world have been created on this theme. The present work comprises three different subareas related to neuroengineering and electrical engineering: neural
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 03/03/2011
-
5. Expressao da ciclooxigenase-2 (COX-2) e do fator de necrose tumoral (TNF-) na viabilidade de retalho cutaneo randomico em ratos apos a irradiacao laser de baixa intensidade / Expressao da ciclooxigenase-2 (COX-2) e do fator de necrose tumoral (TNF-) na viabilidade de retalho cutaneo randomico em ratos apos a irradiacao laser de baixa intensidade / Expression of cyclooxygenase-2 (COX-2) and tumor necrosis factor-alpha (TNF-á) on viability of random skin flaps in rats after low level laser therapy / Expression of cyclooxygenase-2 (COX-2) and tumor necrosis factor-alpha (TNF-á) on viability of random skin flaps in rats after low level laser therapy
Objective: To investigate the effect of low intensity laser irradiation on viability of random skin flap in rats and to evaluate the concentration levels of COX-2 and TNF- á. Method: The sample consisted of 24 rats Wistar EPM-1 randomly divided into three groups. All animals were subjected to a surgically induced cranial base dorsal skin flap, measuring 10X
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 26/01/2011
-
6. Exact photocount statistics : lasers near threshold
A previously constructed laser model with quantum (noncommuting) noise sources was shown to lead near threshold to a quantum rotating-wave Van der Pol oscillator. A full dynamical correspondence between quantum and classical random processes allows one to compute the average of any time-ordered, normal-ordered operator function by averaging the associated fu
Publicado em: 2011
-
7. Repeatability of the evaluation of systemic microvascular endothelial function using laser doppler perfusion monitoring: clinical and statistical implications
OBJECTIVE: An awareness of the repeatability of biological measures is required to properly design and calculate sample sizes for longitudinal interventional studies. We investigated the day-to-day repeatability of measures of systemic microvascular reactivity using laser Doppler perfusion monitoring. METHODS: We performed laser Doppler perfusion monitoring
Clinics. Publicado em: 2011
-
8. Emissão laser em meios espalhadores com ganho: estudos experimentais em soluções etanóicas e aquosas
The approach of this thesis is study the laser emission from highly scattering media with gain with incoherent feedback. These systems are called of random lasers and diverge from the typical laser, because they can emit monochrome light with high intensity without a cavity. We detail several experimental studies in samples containing different rhodamines in
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 22/01/2009
-
9. Laser aleatÃrio por conversÃo ascendente de freqÃÃncia em neodÃmio
Nesta dissertaÃÃo sÃo apresentados resultados experimentais que demonstram a operaÃÃo de um laser aleatÃrio constituÃdo por um meio fortemente espalhador que contÃm partÃculas dopadas com Ãons de neodÃmio. As partÃculas, de formas irregulares e tamanho da ordem de 30 m, foram obtidas apÃs pulverizarmos vidros fluoroindatos dopados com trÃs dife
Publicado em: 2009
-
10. Degradação de poliestirenossulfonato de sódio fotossensibilizada pelo corante QTX / Degradation of poly(styrenesulfonate) photosensitised by QTX dye
The poly(styrenesulfonate) (PSS) photosensitised by 2-hydroxy-3-(3,4-dimethyl-9-oxo-9H-thioxanthen-2-yloxy)-N,N,N-trimethyl-1-propanium chloride (QTX) solution degradation mechanism was investigated. Initially, the photodegradation of QTX in aqueous solution was studied. The photoproducts generated photolysis were characterized as being sulfones and sulfoxid
Publicado em: 2009
-
11. AVALIAÇÃO EXPERIMENTAL DOS EFEITOS DE CINTILAÇÃO NO CANAL ÓPTICO NO ESPAÇO LIVRE EM 780 NM, 1550 NM E 9100 NM / EXPERIMENTAL EVALUATION OF SCINTILLATION EFFECTS IN FREE SPACE OPTICAL CHANNEL IN 780 NM, 1550 NM AND 9100 NM
Optical laser communication in free space is an area that has been attracting increasing interest in the last years, due to its possible capacity to resolve the problem of information diffusion, giving higher capacity access to users. Wireless optical systems offer speedy installation and initialization procedures and system flexibility, with the equivalent
Publicado em: 2008
-
12. Estudo da copolimerização em mini emulsão de metacrilato de metila/metacrilato de etila / Study of methyl methacrylate/ethyl methacrylate in mini emulsion copolimerization
Reduction of volatile organic compounds (VOC) usage is a constant environmental demand. Polymeric aqueous emulsion of low surfactant contends produced from direct miniemulsion synthesis are used with advantages to replace organic solvents media as well as aqueous emulsions of high surfactant concentration. Water as continuous phase and organic monomers with
Publicado em: 2008