Shielding Effect
Mostrando 1-12 de 40 artigos, teses e dissertações.
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1. Zn2Al Layered Double Hydroxides Intercalated with Nitrate and p-Aminobenzoate as Ultraviolet Protective Agents in Low-Density Polyethylene Nanocomposites and Natural Insulating Oils
Zn2Al-Cl and Zn2Al-NO3 layered double hydroxides (LDHs) were synthesized through the fixed pH co-precipitation method and used as precursor materials for the intercalation of p-aminobenzoate through anion exchange reactions. Since chloride in Zn2Al-Cl was only partially exchanged with p-aminobenzoate, the phases Zn2Al-NO3 and Zn2Al-N -AB (nitrate exchanged w
J. Braz. Chem. Soc.. Publicado em: 2020-05
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2. Effect of Nitrogen Addition to Shielding Gas on Cooling Rates and in the Microstructure of Thin Sheets of Duplex Stainless Steel Welded by Pulsed Gas Tungsten Arc Welding Process
The effect of the nitrogen content in the shielding gas and its effect on temperature distributions at the welded zone of thin sheets of duplex stainless steel have been evaluated. The duplex stainless steels have many features due to unique microstructural combination of austenite and ferrite grains. The phase balance can be easily shifted depending on the
Mat. Res.. Publicado em: 26/08/2019
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3. Effect of Simulated Geomagnetic Activity on Myocardial Ischemia/Reperfusion Injury in Rats
Abstract Objective: To study the response of myocardial ischemia/reperfusion injury (MI/RI) in rats to simulated geomagnetic activity. Methods: In a simulated strong geomagnetic outbreak, the MI/RI rat models were radiated, and their area of myocardial infarction, hemodynamic parameters, creatine kinase (CK), lactate dehydrogenase (LDH), melatonin, and tro
Braz. J. Cardiovasc. Surg.. Publicado em: 05/08/2019
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4. Design and Analysis of a Novel Spacecraft for Mitigating Global Warming
ABSTRACT: A device called Huge Space Shield (HSS) has been put forward for mitigating global warming. This is a space tethers system, which use cables to connect a shielding surface and a mechanism control. In this study, orbital analysis was carried out to choose the best orbit for getting the best effect. Simulation studies were employed to understand the
J. Aerosp. Technol. Manag.. Publicado em: 26/02/2018
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5. Effect of Activated Carbons on the Dielectric and Microwave Properties of Natural Rubber Based Composites
The effect of six different types of activated carbons has been studied in view of their applicability as functional fillers upon the dielectric and microwave properties of natural rubber based composites. It is found that the textural characteristics of the studied active carbons exert influence both on the real part of dielectric permittivity and dielectri
Mat. Res.. Publicado em: 06/07/2017
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6. Efecto del Gas de Protección, Ángulos de Trabajo y Desplazamiento sobre las Características de Juntas de Filete Obtenidas por GMAW en un Acero Microaleado de Alta Resistencia
Abstract: The fillet joint is one of the most used in several industries, particularly in the agricultural machinery. However, many times, the complexity of the parts to be joined difficult welder accessibility, therefore working and travel angles are important variables to analyze. Furthermore, in GMAW process, employing shielding gas mixture Ar-20%CO2 has
Soldag. insp.. Publicado em: 2016-09
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7. Efecto de los parámetros de soldadura sobre la microestructura de recargues nanoestructurados base hierro depositados por FCAW-S
Lately modern hardfacing tubular wires for semiautomatic welding with gas protection and without it have been developed. These wires deposit Fe-based nanostructured alloys with high abrasive wear resistance. The information on these new consumables is scarce, especially about the effect that the welding parameters (heat input, shielding gas, arc voltage, cur
Soldag. insp.. Publicado em: 2014-12
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8. Estudo da influência dos parâmetros no processo de soldagem GMAW - arco pulsado
Pulsed gas metal arc welding describes the metal transfer mode involving oscillation (pulsing) of the welding current from a high pulse current in which level drop growth, necking of wire tip and detachment occur, and a low background current, which is applied to maintain the arc. The advantages of the process are: metal transfer without spatter formation an
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/09/2011
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9. Estudo da influência dos efeitos de interação hidrodinâmicos em operações de alívio auxiliadas por sistemas DP. / An study about the influence of the hydrodynamic interaction effects in offloading DP operations.
Hoje em dia, a maioria das operações de alívio é feita utilizando um sistema de posicionamento dinâmico (DP). O sistema DP permite controlar a posição relativa entre o navio aliviador e o FPSO (Floating Production Storage and Offloading), trazendo desta forma muitas vantagens à operação. Neste tipo de operação os dois corpos flutuantes precisam f
Publicado em: 2009
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10. INFANTILE CANCER: SYMBOLIC AND IMAGINARY PLACES IN THE PARENTS/SON LINK / "CÃncer Infantil: Lugares SimbÃlicos e ImaginÃrios no LaÃo Pais/Filhos"
We propose in this dissertation to understand the childhood cancer linked to the subjective constitution process, taking as a reference the psychoanalytic study of somatic symptoms in babies and small children from the symbolic and imaginary places that children have on parentâs desire. We address this issue articulating the process of the subject construct
Publicado em: 2008
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11. Synthesis and nuclear magnetic resonance shielding effect of three triazine-linked porphyrin compounds
Três porfirinas, monômero Por I, dímero Por II e trímero Por III, foram sintetizadas através da reação de cloreto cianúrico, 5-(4-hidroxofenil)-10,15,20-trifenil porfirina e 1-fenilpiperazina. As propriedades destas porfirinas inéditas, no que diz respeito à proteção na ressonância magnética, aos acoplamentos e desdobramentos dos hidrogênios b
Journal of the Brazilian Chemical Society. Publicado em: 2007
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12. INVESTIGATION OF THE STRUCTURAL EFFECTS OF LIGANDS 1,3-DIARIL TRIAZENIDOS SYMMETRICAL ORTO-SUBSTITUTEDS IN MERCURYS COMPLEXES (II) / INVESTIGAÇÃO DOS EFEITOS ESTRUTURAIS DE LIGANTES 1,3- DIARILTRIAZENIDOS SIMÉTRICOS ORTO-SUBSTITUÍDOS EM COMPLEXOS DE MERCÚRIO (II)
This work was accomplished with the interest in the synthesis of ortosubstituted ligands, with special prominence to the moiety __CF3, __Br and __NO2 and later the complexação with Hg(II). The first obtained result was the crystalline structure of the ligand (1), it crystallizes in the system crystalline monoclínico, space group Cc, with the given followi
Publicado em: 2007