Air Masses
Mostrando 1-12 de 23 artigos, teses e dissertações.
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1. Is it still worth Publishing Case Reports? They are Part of our Lives
Partially hydrogenated soybean oil and palm olein are oils that are widely used in the food industry. Continuous contact with air may cause changes of the triglycerides chemical structure, to eventually produce substances of lower molar masses that may be toxic to mammals. This study aimed to determine the kinetic parameters for the thermal oxidation of thes
Braz. J. Cardiovasc. Surg.. Publicado em: 2020-10
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2. Kinetic Parameters of the Thermal Oxidation and Degradation Reactions in Soybean Oil and Palm Olein
Partially hydrogenated soybean oil and palm olein are oils that are widely used in the food industry. Continuous contact with air may cause changes of the triglycerides chemical structure, to eventually produce substances of lower molar masses that may be toxic to mammals. This study aimed to determine the kinetic parameters for the thermal oxidation of thes
J. Braz. Chem. Soc.. Publicado em: 2020-10
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3. A mass-spring model of the auditory system in otosclerosis
INTRODUCTION: This paper aims to describe a model to simulate otosclerosis using a mass-spring model and to correlate the results with the clinical and audiological data on the disease. METHODS: A mass-spring model was used to represent the behavior of the auditory system simulating otosclerosis. The model consisted of six masses (air volume in the external
Rev. Bras. Eng. Bioméd.. Publicado em: 2014-09
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4. Estabilidad de la estimación de la onda anual en escala diaria de la temperatura
The choice of estimation of deterministic effect method in climate series is usually the starting point for most studies on climate variability. This decision is more sensitive when the presence of nonlinear phenomena is explored. Therefore, this paper analyzes the robustness and stability of different methods to estimate the annual cycle in time series of d
Rev. bras. meteorol.. Publicado em: 2012-12
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5. Design Optimization of Micro Air Launch Vehicle Using Differential Evolution
Abstract: In this paper, we have used the differential evolution to optimize the design of a Micro Air Launch Vehicle and its launch trajectory. Since trajectory design of a launch vehicle requires prior knowledge of the masses and propulsion performance parameters of the Micro Air Launch Vehicle, whereas the vehicle design requires prior knowledge of the re
J. Aerosp. Technol. Manag.. Publicado em: 2012-06
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6. Preliminary analysis of hybrid rockets for launching nanosats into LEO
This work determines the preliminary mass distribution of hybrid rockets using 98% H2O2 and solid paraffin mixed with aluminum as propellants. An iterative process is used tocalculate the rocket performance characteristics and to determine the inert mass fractionfrom given initial conditions. It is considered a mission to place a 20 kg payload into a 300 km
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2010-12
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7. Release of Trichogramma pretiosum (Hym.: Trichogrammatidae) and evaluation of Trichogrammatidae on egg masses of Spodoptera frugiperda (Lep.: Noctuidae) in corn / LIBERAÇÃO DE Trichogramma pretiosum (Hym.: Trichogrammatidae) E AVALIAÇÃO DE Trichogrammatidae EM POSTURAS DE Spodoptera frugiperda (Lep.: Noctuidae) NA CULTURA DO MILHO
Fall armyworm, Spodoptera frugiperda (J.E. Smith), is considered the major pest of corn. In general, the control of larvae is achieved with insecticides application, which can cause several environmental problems. In search of alternative control methods, egg parasitoids of the genus Trichogramma have been used in applied biological control programs, since t
Publicado em: 2009
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8. Urban climate Ponta Grossa-PR: an approach to climate dynamics in subtropical Brazilian city average / Clima urbano em Ponta Grossa - PR: uma abordagem da dinâmica climática em cidade média subtropical brasileira
The human being has led to changes in climate through the transformation of nature, whether for its occupation of space, is to develop its activities. To the extent that the man is concentrated in certain áreas, pressure on the natural conditions increases. The city is one of the best examples of the concentration of people and activities in one place and a
Publicado em: 2009
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9. Estudo de processos alternativos para a degradação de compostos de relevância ambiental com monitoramento dos produtos formados por espectometria de massas com fonte de ionização electrospray (ESI-MS)
Over the last decades, the growth of population and industrial activities has contributed to the aggravation of environmental problems, especially the contamination of superficial and underground waters. This is mainly caused by the enormous amounts of domestic or industrial wastes that are many times discarded directly into these bodies with no previous tre
Publicado em: 2008
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10. Size distribution of atmospheric particulate ionic species at a coastal site in Portugal
A Berner impactor was used to collect size-differentiated aerosol samples from March to August 2003 in the city of Aveiro, on the Portuguese west coast. The samples were analysed for the main water-soluble ion species. The average concentration of sulphate, nitrate, chloride and ammonium was 6.38, 3.09, 1.67 and 1.27 µg m-3, respectively. The results show t
Química Nova. Publicado em: 2007
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11. DETERMINAÇÃO DE CÁDMIO E CHUMBO EM SANGUE POR ESPECTROMETRIA DE ABSORÇÃO ATÔMICA COM TUBO AQUECIDO NA CHAMA APÓS COMBUSTÃO INICIADA POR MICROONDAS
In this work a procedure for Cd and Pb determination by solid sampling flame furnace atomic absorption spectrometry after microwave induced combustion (MIC-FF-AAS) is used. Human blood samples were priory lyophilized, dried, ground, mixture with graphite, pressed and placed on a filter paper positioned on a quartz holder, that was introduced in a glass devic
Publicado em: 2007
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12. Caracteristicas da poeira do processo de fabricação de materiais ceramicos para revestimento : estudo no polo de Santa Gertrudes / Characteristics of dust from the manufacturing process of ceramic materials for tiles : study in the Santa Gertrudes complex
Dust generated in the process of manufacturing ceramic materials may be a hazardous agent to the health of workers, especially when silica polymorphs in crystal forms of ?-quartz and cristobalite are present in its composition. Occupational exposure to respirable dust of such polymorphs may lead to the onset of lung disease named silicosis and other associat
Publicado em: 2007