Ultrasound Radiation
Mostrando 13-24 de 39 artigos, teses e dissertações.
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13. Prostate volume predicts high grade prostate cancer both in digital rectal examination negative (ct1c) and positive (≥ct2) patients
Introduction We aimed to assess the relationship between prostate volume (PV) and high grade prostate carcinoma (HGPCa) in patients with benign and suspicious digital rectal examination (DRE) in our prostate biopsy cohort. Materials and methods Between 2009-2012, 759 consecutive initial transrectal systematic 12 cores prostate biopsies were included. PV
Int. braz j urol.. Publicado em: 2014-10
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14. Value of color doppler ultrasound, kub and urinalysis in diagnosis of renal colic due to ureteral stones
Purpose Despite the routine use of helical CT in diagnosis of renal colic, there are recent concerns regarding the radiation exposure, overuse and costs. We attempted in this retrospective study to evaluate the accuracy of ultrasound (gray-scale and color Doppler with twinkling), KUB and urinalysis in diagnosis of renal colic due to ureteral calculi presen
Int. braz j urol.. Publicado em: 2014-08
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15. Imagens acústicas geradas pela interação da radiação ultrassônica com o meio material / Acoustic images generated by the interaction of ul-trasonic radiation with the medium.
Neste trabalho é apresentada uma nova modalidade de imagens elastográficas baseada na emissão acústica, quando um meio é submetido à radiação ultrassônica. Esta técnica está sendo denominada de Acustografia por Pulso/Emissão (APE). Características não-lineares da propagação acústica de ondas ultrassônicas, e a resposta mecânica vibracional
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 16/09/2011
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16. Compósitos avançados epóxi/fibra de vidro com elevado teor de nanotubos de carbono
The use of carbon nanotubes (CNT) in Epoxy (EP)/Glass Fiber (GF) composites, producing tri-component composites, has been widely researched, with some interesting results related to mechanical and electromagnetic properties. When the goal is a significant improvement in mechanical properties, CNT content greater than 1%wt. may be necessary, which yields seri
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2011
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17. Vibroacustografia na avaliação tridimensional de artroplastia total de quadril / Vibro-acoustography in the tridimensional evaluation of total hip arthroplasty
Vibro-acoustography (VA) is a high lateral resolution (<0.7 mm), speckle-free, non- ionizing and non-invasive image based on the nonlinear combination phenomenon of ultrasound waves (MHz) that generates a narrow focus region of low frequency (kHz). In this work, we propose a VA-based tridimensional evaluation of the exposed area of implants, after total hip
Publicado em: 2011
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18. Potencialidades do uso de ultrassom na determinação do pesticida carbaril empregando eletrodos de diamante
The potentiality of the use of ultrasound radiation in association with a boron-doped diamond electrode was evaluated on the voltammetric determination of the pesticide carbaryl. Improvements in the sensitivity, limit of detection and reproducibility of the measurements were observed due to both, the enhancement of mass transport and the cleaning of the elec
Química Nova. Publicado em: 2010
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19. Estudo da força de radiação acústica em partículas produzida por ondas progressivas e estacionárias. / Acoustic radiation force on particles produced by progressive and standing waves.
O objetivo deste trabalho é estudar o fenômeno da força de radiação acústica produzida por ondas progressivas e estacionárias. Neste trabalho o estudo da força produzida por ondas estacionárias é aplicado na análise de um levitador acústico e o estudo da força de radiação acústica por ondas progressivas é feito visando a futura construção
Publicado em: 2010
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20. SUPERAÇÃO DA DORMÊNCIA DE SEMENTES E CONTROLE QUÍMICO DE CORDAS-DE-VIOLA (Ipomoea spp.) EM SOJA RESISTENTE AO GLIFOSATO
Morningglory is an annual plant reproduced by seeds. Seed germination occurs in streams during spring and summer making it difficult to control. Its occurrence has increased in soybean crops in southern states by the exclusive use of the herbicide glyphosate in weed control. This species has seed dormancy caused by impermeable to water, whose absorption is p
Publicado em: 2010
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21. Estudo da associação do polimorfismo genético em carcinomas da tiróide / Study on the association of genetic polymorphism in thyroid cancer
Thyroid nodules are common in clinical practice and the incidence of thyroid cancer is increasing throughout the world. Certainly, an important factor for the increase of the incidence is the use of ultrasound and PAFF. The identification of genetic polymosphism is important for understanding the potential mechanisms involved in thyroid carcinogenesis. We hy
Publicado em: 2010
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22. Use of chiral alfa-oxigenated aldehydes in the Morita-Baylis-Hillman reaction : studies toward the optmization of reaction conditions and synthesis of bioactive compounds / Uso de aldeidos quirais alfa-oxigenados na reação de Morita-Baylis-Hillman : estudos visando otimização das condições reacionais e sintese de compostos bioativos
In this work, we describe the utilization of ultrasound and ionic liquid in Morita-Baylis-Hillman reactions, with chiral aldehydes bearing oxygen at the a-carbonyl position. Due to the long reaction times normally observed in the Morita-Baylis-Hillman reaction, a-oxigenated chiral aldehydes can be racemized in the reaction, directly impacting on the diastere
Publicado em: 2008
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23. Desenvolvimento de um sistema on-line para a avaliação de doses fetais em radiologia diagnóstica / Development of on line system for the evaluation of fetal doses in diagnostic radilogy
In this work, an online system called Dose Fetal Web was developed for the evaluation of fetal doses in diagnostic radiology. The methodology used in this system estimates the fetal dose from data related to radiologic diagnostic examinations of a pregnant patient, or from the routine individual monitoring dosimetry of a pregnant worker. The input data of th
Publicado em: 2008
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24. Efeito do ultra-som de baixa intensidade no colágeno da pele sadia de ratos / The effects of a low intensity ultrasound on health rat skin
The low intensity ultrasound is a resource that is been explored over many different kinds of tissues, including skin. However, most studies attempt only to the skin healing process. The objective of this study was to evaluate the behavior of collagen fibers in the derm when exposed to the low intensity ultrasound through birefringence and histological analy
Publicado em: 2007