Ultraviolet Radiation Index
Mostrando 1-9 de 9 artigos, teses e dissertações.
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1. Evaluation of Fracture Toughness of Ultraviolet-Irradiated Polycarbonate Using the Essential Work of Fracture Method
The essential work of fracture (EWF) method provides useful parameters to characterize the fracture toughness of polymers exposed to degrading environments under conditions associated with plane-stress state of failure. Exposure of polymeric engineering materials to ultraviolet (UV) radiation may produce macromolecular changes that impair their fracture toug
Mat. Res.. Publicado em: 26/07/2018
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2. Biometrical and morphological analyses of Macrobrachium olfersii (Wiegmann, 1836) (Crustacea, Decapoda, Palaemonidae) embryos exposed to UVA and UVB radiation
ABSTRACT Macrobrachium olfersii (Wiegmann, 1836) is a prawn that lives in shallow and transparent freshwater in Southern Brazil. Aquatic organisms that inhabit these systems can be exposed to incident UV radiation. Many studies have demonstrated the effects of ultraviolet (UV) radiation on the development, survival rate, morphological abnormalities, and impa
Nauplius. Publicado em: 21/06/2018
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3. Solar ultraviolet radiation: properties, characteristics and amounts observed in Brazil and South America
Abstract The beneficial and harmful effects of human exposure to solar ultraviolet radiation (UV-R) are topics that arouse great interest not only among physicians and scientists, but also the general public and the media. Currently, discussions on vitamin D synthesis (beneficial effect) are confronted with the high and growing number of new cases of non-mel
An. Bras. Dermatol.. Publicado em: 2015-06
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4. Estudo da radiação ultravioleta na Cidade de Natal-RN
There were studied the variation of the solar ultraviolet radiation (UVR) in four wavelengths (305 nm, 320 nm, 340 nm e 380 nm) and erythemic dose, measured in Natal RN Brazil, from January 2001 until December 2007, using the ground ultraviolet radiometer of the Instituto Nacional de Pesquisas Espaciais / Centro Regional do Nordeste INPE-CRN, fixed on the ro
Publicado em: 2008
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5. Estimativa da irradiÃncia solar ultravioleta horÃria no semi-Ãrido pernambucano / Estimation of hourly ultraviolet solar irradiance in the semi-arid region of Pernambuco
Dois cÃdigos computacionais, SPCTRAL2 e SMARTS2, foram utilizados para estimar a irradiÃncia solar ultravioleta e o Ãndice de irradiaÃÃo ultravioleta em uma localidade do semi-Ãrido do Nordeste do Brasil. Os softwares apresentam simplicidade de uso, precisÃo e relativa facilidade na obtenÃÃo das variÃveis de entrada: Ãngulo zenital, pressÃo atmos
Publicado em: 2007
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6. Effects of chronic and prolonged solar radiation in immunologic system of fishermen from Recife, Brazil / Efeitos da radiação solar crônica e prolongada sobre o sistema imunológico de pescadores do Recife
Introduction: The ultraviolet radiation effects on the human immunological system are highly complex, disturbing some components of immune response. Objective: The objective of this study was to evaluate the clinical, histopathological and immunological effects from solar radiation in male fishermen with more than 10 years of uninterrupted activity. Methods:
Publicado em: 2007
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7. Avaliação da fotodegradação de poliolefinas através de exposição natural e artificial
Samples of polypropylene (PP) and low-density polyethylene (LDPE) were submitted to ultraviolet radiation, in the natural environment and also in the laboratory. Chemical modifications were quantified by the carbonyl index (CI), mechanical properties and melt flow index. The degradation in the laboratory was comparatively faster than in the environment for b
Química Nova. Publicado em: 2006-07
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8. Evaluation of parameters associated with UV/EB cured clearcoats degradation used in outdoor environment / Avaliação da formação e degradação de filmes de vernizes curados por radiação ultravioleta e feixe de elétrons e expostos ao envelhecimento acelerado
The materials curable by ultraviolet (UV) or electron beam (EB) radiation such as inks, adhesives and coatings are reactive compounds made up of resin, monomer, photoinitiator and additives which undergo polymerization and crosslinking under irradiation producing thermoset products. This technology has been used in a great variety of industrial applications,
Publicado em: 2003
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9. Desenvolvimento de sistemas fotocuraveis a partir da utilização de modelos de predição por contribuição de grupos
A study about the development of polymeric material with controllable optic and mechanical properties using models of prediction of polymers properties for groups contribution, is presented in this work. The study it was carried out in multicompound polymeric systems using a mixture of styrene monomer and polyethyleneglycoldimethacrylates with the addition o
Publicado em: 2003