John Huxley, Graham Swift, Malcolm Brown, Linda Stratford, William Kay, Miles Kington, Will Ellsworth-Jones, Jon Swain, Chris Ryder, Rob Hughes, John Vincent, Peter Marson, Chris Tighe, Nick Gilbert Deputy City Editor, Christopher Hird, Berry Ritchie, Graham Rose, Tom Pocock, John F. Wallace, J. M. Coetzee, Robin Morgan, Nick Pitt, Jason Tomas, Henry Porter, Richard Eaton, Patricia Roberts, Roger Kemp Writer, Joseph Harrison Former headmaster, Robert Hewison, Deryk Brown, Mick Brown, Keith Botsford, Robin Wright, David Dougill, Joe Irving, Malcolm Bradbury, Sally Vincent, Derek Jewell, Tania Maria, Nicholas Shrimpton, S. L., Simon Gray, Steve Tsang, David Cairns, Peter Kemp, Norman Harris, Donald Macintyre Labour Editor, David Blundy, Donald Macintyre, David Bonavia, Keith Hearne, Peter Ackroyd, Michael Jones, Lionel Barber, Ross Davies, George Perry, Geoffrey Wheatcroft, Brian Moynahan, John Osbome, Donald MacIntyre, Roger Eglin, Ann Boyd, Don MacPherson, James Tucker, Michael Nimmo, David Howell, Kenneth Warren, Salman Rushdie, Helen Gerald, Richard Brooks, David Hughes, Muriel Bowen Local Government Correspondent, Angela Carter, George Rosie, Anne Karpf, Snowdon, Claire Tomalin, Judith Jackson, Richard Girling, Marina Valzey, Michael Neve, Brilliance Books, Mary Anne, Nick Gilbert, John Hopkins, Nick Rosen, David Lipsey Economics Editor, Stephen Barnett, Iain Scarlet, Jill Neville, Eric Marsden, Peter Wilsher, Hugo Young Political Editor, Bryan Silcock, Stephen Pile, Peter Hall, Elaine Potter, Gareth Huw-Davies, Tony Levene, Brian Deer, John Ryle, Russell Davies, Don McCullin, Raymond Lygo Managing Director, Martin Kettle, Stephen Aris, Patrick Rowley, Peter Wilsher Foreign Editor, Dilys Powell, David Lipsey, Andrew Hogg, Brough Scott, Deyan Sudjic, Nick Kimberley, Stuart Alexander, Brlan Moynahan, Kim Fletcher, Dudley Doust, Felix Aprahamian, Alison Miller, Peter Wilby, Brian MacArthur, Stephen Fay, Mihir Bose, Peter Clarke, Godfrey Smith, Suzanne Lowry, Russell Twisk, Brian Glanville, Anita Mason, Peter Dunn, James Fenton, Paul Kerr, Michael Green, Michael Blendell, Michael Jones Political Correspondent, Andrew Warren Director, John Fuller, Dr Jonathan Miller, Harriet Harman, Jan Mayman, Phillip Knightley, Tony Hetherington, Marjory Warner, Philip Jacobson, Brian Clough, John Marshall, Joan Smith, Hugh Trevor-Roper, Boris Schapiro,
... Harrods Designs on Linen Linen Harrods Harrods Gouveia & Alves Harrods Harrods Harrods Harrods Picture Gallery Designs on ...
1983 - Gale Group | Sunday Times HA GDA
... https://doi.org/10.5772/intechopen.97538Samuel Gomes, Tomás Alves, João Dias, Carlos Martinho Reward-Mediated Individual and ...
Tópico(s): Insect and Arachnid Ecology and Behavior
1963 - University of Chicago Press | The American Naturalist
Tomás Alves, Joana Natálio, Joana Henriques‐Calado, Sandra Gama,
A current topic of Human-Computer Interaction focuses on understanding and assessing user-centered design taking into account certain psychological factors related to users' thought processes, feelings and behavior into account. In particular, personality is an idiosyncratic psychological construct that captures many of such aspects from a user. It allows designers to provide a better user experience by adapting a user interface to individual characteristics. This review presents the impact of design ...
Tópico(s): Impact of Technology on Adolescents
2019 - Elsevier BV | Personality and Individual Differences
Miguel Angelo Giovanni Noronha Júnior, Yuri Amorim Braga, Tamyres Gonçalves Marques, Rosane Terra Silva, Samila Danielle Vieira, Victória Alves Ferreira Coelho, Tomás Antunes Alves Gobira, Liubiana Arantes de Araújo Regazzoni,
Depression is a common medical condition usually associated with functional disability and impaired physical and mental health. It involves affective, cognitive, and neuro-vegetative aspects. It is estimated that 15-25% of college students present a psychiatric disorder during their training, especially depression and anxiety. The prevalence of depressive disorders ranged between 30 and 60% of medical students. The objective was to review the literature on depression in medical students and determine ...
Tópico(s): Perfectionism, Procrastination, Anxiety Studies
2015 - | Revista Médica de Minas Gerais
Produção Nacional
Revisado por pares
Renata Barbosa, Tatianny Soares Alves, Edcleide Maria Araújo, Tomás Jefférson Alves de Mélo, Giovanni Camino, Alberto Fina, Edson N. Ito,
High-density polyethylene/modified bentonite clay/polar compatibilizer nanocomposites were prepared through the melt intercalation process. The clay was organophilizated using different percentages of quaternary ammonium salt 100, 125, and 150 % based cation exchange capacity of the clay. The nanocomposites were prepared in a counter-rotating twin-screw extruder and then specimens were injection molded. For the evaluation of flammability of the test system was used for burning in the horizontal position ...
Tópico(s): Polymer Nanocomposite Synthesis and Irradiation
2013 - Springer Science+Business Media | Journal of Thermal Analysis and Calorimetry
Produção Nacional
Revisado por pares
Dennyele Alves Gama, José Manoel Rosa Júnior, Tomás Jefférson Alves de Mélo, John Kennedy Guedes Rodrigues,
Reactive polymers, consisting of glycidyl methacrylate, produce a chemical reaction between the polymer and the asphalt binder that can be beneficial for asphalt application in hot climates. Elastomeric-modified-bitumen mixes were developed using elastomeric polymer (EMA-GMA), high density polyethylene (HDPE) and polyphosphoric acid (PPA 116%). Physical and rheological properties of modified bitumen, complex modulus (|G∗|), phase angle (δ), and MSCR test were analyzed. Test results of penetration, softening ...
Tópico(s): Polymer Nanocomposites and Properties
2015 - Elsevier BV | Construction and Building Materials
Produção Nacional
Revisado por pares
Gustavo de Figueiredo Brito, Pankaj Agrawal, Edcleide Maria Araújo, Tomás Jefférson Alves de Mélo,
Blends of poly(lactic acid) (PLA) and ethylene/methyl acrylate/glycidyl methacrylate terpolymer (EMA‐GMA) with and without the addition of an organoclay were prepared by melt mixing in a twin screw extruder. Mechanical, morphological, structural, and rheological properties of the systems have been investigated as function of its compositions. The impact strength (IS) of PLA increased with the addition of EMA‐GMA. Furthermore, the addition of 2.5 wt% of organoclay to the PLA/EMA‐GMA blend promoted improvements ...
Tópico(s): Polymer crystallization and properties
2013 - Wiley | Polymer Engineering and Science
Produção Nacional
Revisado por pares
Tomás Jefférson Alves de Mélo, Edcleide Maria Araújo, Gustavo de Figueiredo Brito, Pankaj Agrawal,
In this work the effect of 2.5% and 5% (wt) of organoclay on the mechanical properties and morphology of PLA/EMA-GMA blend was investigated. The nanocomposites were prepared by extrusion followed by injection molding and characterized by X-ray diffraction (XRD), mechanical properties and Scanning Electron Microscopy (SEM). The results showed that better impact strength was achieved when 2.5% (wt) of clay was added to the PLA/EMA–GMA blend. XRD results indicated that this nanocomposite presented a partially ...
Tópico(s): Silicone and Siloxane Chemistry
2013 - Elsevier BV | Journal of Alloys and Compounds
Produção Nacional
Revisado por pares
Pankaj Agrawal, Milena H. A. Silva, Shirley N. Cavalcanti, Daniel M. G. Freitas, Jeane P. de Araújo, Akidauana D. B. Oliveira, Tomás Jefférson Alves de Mélo,
Tópico(s): Polymer Foaming and Composites
2021 - Springer Science+Business Media | Polymer Bulletin
Produção Nacional
Revisado por pares
Pankaj Agrawal, André. W. B. Rodrigues, Edcleide Maria Araújo, Tomás Jefférson Alves de Mélo,
Tópico(s): Natural Fiber Reinforced Composites
2009 - Springer Science+Business Media | Journal of Materials Science
Produção Nacional
Revisado por pares
Tomás Jefférson Alves de Mélo, Sebastião V. Canevarolo,
Abstract This paper proposes a setup for in‐line measurement of residence time distribution (RTD) curves during extrusion. The detection system is composed of a slit die with transparent borosilicate glass windows fixed at the extruder exit, an optical arrangement with an incandescent light microbulb with fixed luminescence, and a Light Dependent Resistor (LDR) photocell of CdS. As the tracer passes through the light path, the reduction in the transmitted light intensity is followed by changes in ...
Tópico(s): Metallurgy and Material Forming
2002 - Wiley | Polymer Engineering and Science
Produção Nacional
Gustavo de Figueiredo Brito, Amanda Dantas de Oliveira, Edcleide Maria Araújo, Tomás Jefférson Alves de Mélo, Renata Barbosa, Edson N. Ito,
Nanocompósitos de polietileno de alta densidade/argila bentonita nacional foram preparados por intercalação por fusão. A influência da adição da argila sem tratamento e da argila tratada com o sal quaternário de amônio Cetremide e do polietileno graftizado com anidrido maléico (PE-g-MA) como agente compatibilizante foi avaliada. Os sistemas obtidos foram caracterizados por inflamabilidade, propriedades mecânicas e reológicas, difração de raios X e microscopia eletrônica de transmissão. Os resultados ...
Tópico(s): Natural Fiber Reinforced Composites
2008 - Associação Brasileira de Polímeros | Polímeros
Produção Nacional
Pankaj Agrawal, Edcleide Maria Araújo, Tomás Jefférson Alves de Mélo,
Neste trabalho investigamos o efeito de diferentes compatibilizantes na reometria de torque, propriedades mecânicas e morfologia das blendas de PA6/PEAD. As blendas foram preparadas em uma extrusora dupla-rosca contra-rotativa com filetes totalmente interpenetrantes, a 240 °C em todas as zonas e velocidade de 50 rpm. A composição das blendas foi de 80/20 (% em peso) para as blendas binárias de PA6/PEAD e de 80/10/10 (% em peso) para as blendas ternárias de PA6/Compatibilizante/PEAD. Os resultados mostraram ...
Tópico(s): biodegradable polymer synthesis and properties
2008 - Associação Brasileira de Polímeros | Polímeros
Produção Nacional
Revisado por pares
Edcleide Maria Araújo, Renata Barbosa, Amanda Dantas de Oliveira, Crislene R. S. Morais, Tomás Jefférson Alves de Mélo, A. G. Souza,
Tópico(s): Tribology and Wear Analysis
2007 - Springer Science+Business Media | Journal of Thermal Analysis and Calorimetry
Produção Nacional
André. W. B. Rodrigues, Maria Isabel Brasileiro, Williane D. Araújo, Edcleide Maria Araújo, Gelmires de Araújo Neves, Tomás Jefférson Alves de Mélo,
Os nanocompósitos de polipropileno/ bentonita e polipropileno/compatibilizante/bentonita foram preparados empregando uma extrusora dupla rosca acoplada a um Reômetro de Torque Haake. A argila bentonita natural proveniente do Município de Boa Vista - PB passou por um processo de purificação para em seguida ser aditivada com carbonato de sódio e posteriormente tratadas com o sal quaternário de amônia, visando a obter argila organofílica. As argilas foram caracterizadas por granulometria por difração ...
Tópico(s): Chemistry Education and Research
2007 - Associação Brasileira de Polímeros | Polímeros
Produção Nacional
Revisado por pares
Pankaj Agrawal, Silvia Ivanilde de Oliveira, Edcleide Maria Araújo, Tomás Jefférson Alves de Mélo,
Tópico(s): Natural Fiber Reinforced Composites
2007 - Springer Science+Business Media | Journal of Materials Science
Produção Nacional
Revisado por pares
Edcleide Maria Araújo, Amanda Melissa Damião Leite, Renê Anísio da Paz, Vanessa da Nóbrega Medeiros, Tomás Jefférson Alves de Mélo, Hélio de Lucena Lira,
The purpose of this study was to obtain polyamide 6 nanocomposites with national organically modified clay with three quaternary ammonium salts. The obtained results confirm the intercalation of molecules of salt in the clay layers, and a good interaction with the polymer, showing the formation of intercalated and/or partially exfoliated structures. The nanocomposites showed similar thermal stability compared to pure polymer, and the mechanical properties presented interesting and promising results.
Tópico(s): Dielectric materials and actuators
2011 - Multidisciplinary Digital Publishing Institute | Materials
Produção Nacional
Edcleide Maria Araújo, Kasselyne D. Araújo, Osanildo Damião Pereira, P.C. Ribeiro, Tomás Jefférson Alves de Mélo,
The mechanical properties of polyester/fiberglass composites were studied. The aim of this work was to evaluate the possibility of reusing the wastes taken from spray-up processing of Paraíba state Industries as reinforcement in polyester matrix composites. Composites with 20, 30, 40, 50 and 60 wt. (%) of recycled fiberglass were prepared by compression molding and compared with polyester/ virgin glass fiber composites. The mechanical properties and water sorption behavior were evaluated. The results ...
Tópico(s): biodegradable polymer synthesis and properties
2006 - Associação Brasileira de Polímeros | Polímeros
Produção Nacional
Renata Barbosa, Edcleide Maria Araújo, Larissa Fernandes Maia, Osanildo Damião Pereira, Tomás Jefférson Alves de Mélo, Edson N. Ito,
Nanocompósitos de polietileno de alta densidade e poliamida-6 com argila bentonita nacional foram preparados por meio do processo de intercalação por fusão. Para a modificação da argila foram utilizados tipos diferentes de sais quaternários de amônio visando sintetizar as argilas organofílicas. As argilas não modificada e modificada com os sais foram incorporadas nas matrizes poliméricas, sendo que foram utilizados procedimentos diferentes para a modificação das argilas: para os nanocompósitos de ...
Tópico(s): Polymer crystallization and properties
2006 - Associação Brasileira de Polímeros | Polímeros
Produção Nacional
Revisado por pares
Renata Barbosa, Edcleide Maria Araújo, Tomás Jefférson Alves de Mélo, Edson N. Ito,
Tópico(s): biodegradable polymer synthesis and properties
2006 - Elsevier BV | Materials Letters
Produção Nacional
Revisado por pares
Renata Barbosa, Edcleide Maria Araújo, Amanda Dantas de Oliveira, Tomás Jefférson Alves de Mélo,
A bentonita, composta predominantemente pelo argilomineral montmorilonita que lhe confere as propriedades físicas concentra a maior parte das reservas nacionais (62%) no Estado da Paraíba. A transformação da bentonita em argila organofílica consiste em um procedimento laboratorial simples e pode ser realizada através de reação de troca dos cátions (Na+ ou Ca2+) presentes na superfície e no espaço interlamelar dos argilominerais, por cátions de sais quaternários de amônio. Neste trabalho as bentonitas ...
Tópico(s): Iron oxide chemistry and applications
2006 - Associação Brasileira de Cerâmica | Cerâmica
Produção Nacional
Revisado por pares
Edcleide Maria Araújo, Renata Barbosa, André. W. B. Rodrigues, Tomás Jefférson Alves de Mélo, Edson N. Ito,
Nanocomposites containing polyethylene (PE) and montmorillonite clay organically modified (OMMT) with quaternary ammonium salts were obtained via direct melt intercalation. A montmorillonite sample from the Brazilian state of Paraíba was treated with four different types of quaternary ammonium salts. After the treatment, the powder was characterized by X-ray diffraction and scanning electron microscopy. The dispersion and morphologies of OMMT within PE were investigated by X-ray diffraction and transmission ...
Tópico(s): Tribology and Wear Analysis
2006 - Elsevier BV | Materials Science and Engineering A
Produção Nacional
Edcleide Maria Araújo, Tomás Jefférson Alves de Mélo, Amanda Dantas de Oliveira, Homara L. D. Araújo, Kasselyne D. Araújo, Renata Barbosa,
Argilas bentoníticas provenientes do Município de Boa Vista/PB foram utilizadas para a produção de argilas organofílicas. As argilas organofílicas foram obtidas a partir da síntese com quatro tipos de sais quaternários de amônio: cloreto de alquil dimetil benzil amônio (Dodigen), cloreto de estearil dimetil amônio (Praepagen), cloreto de cetil trimetil amônio (Genamin) e brometo de cetil trimetil amônio (Brometo). As argilas tratadas com os sais e a não tratada foram caracterizadas por difração de raios ...
Tópico(s): biodegradable polymer synthesis and properties
2006 - Associação Brasileira de Polímeros | Polímeros
Produção Nacional
Gustavo de Figueiredo Brito, Pankaj Agrawal, Edcleide Maria Araújo, Tomás Jefférson Alves de Mélo,
O poli(ácido lático) é um polímero biodegradável proveniente de fontes renováveis com grande potencial para substituir polímeros não biodegradáveis provenientes do petróleo. Entretanto, seu uso em determinadas aplicações é restringido devido a sua elevada fragilidade e rigidez. Com o intuito de tornar o PLA mais tenaz, o terpolímero (etileno/acrilato de metila/metacrilato de glicidila) -EMA-GMA foi adicionado ao PLA em diferentes concentrações. A adição do EMA-GMA tornou o PLA mais estável durante ...
Tópico(s): Polymer Nanocomposites and Properties
2012 - Associação Brasileira de Polímeros | Polímeros
Produção Nacional
Gustavo de Figueiredo Brito, Pankaj Agrawal, Edcleide Maria Araújo, Tomás Jefférson Alves de Mélo,
In this work, Polylactide/Biopolyethylene blends were developed. Although some studies have been carried out on polylactide/polyethylene blends, none of them has used polyethylene synthesized with raw material obtained from natural sources. Due to the incompatibility between polylactide and polyethylene, E-GMA and EMA-GMA compatibilizers were used. These compatibilizers present glycidyl methacrylate groups in their structure, which may react with the functional end-groups of polylactide. To evaluate ...
Tópico(s): Additive Manufacturing and 3D Printing Technologies
2012 - Associação Brasileira de Polímeros | Polímeros
Produção Nacional
Revisado por pares
Florêncio G. Ramos Filho, Tomás Jefférson Alves de Mélo, Marcelo S. Rabello, Suédina Maria de Lima Silva,
A polycationic bentonite clay (PB) was organically modified with a quaternary organic salt and added to isotactic polypropylene (PP). The compounds were prepared by melt intercalation using a twin extruder then characterized by X-ray diffraction (XRD), thermogravimetry (TG) and scanning electron microscopy (SEM) for clarifying the composite nanostructure. Compression moulded films were exposed to a thermal oxidative environment at 110 °C in an attempt to evaluate the thermal stability of PP matrix after ...
Tópico(s): biodegradable polymer synthesis and properties
2005 - Elsevier BV | Polymer Degradation and Stability
Produção Nacional
Revisado por pares
Alexandre Rangel de Sousa, K.L.E. Amorim, Eliton S. Medeiros, Tomás Jefférson Alves de Mélo, Marcelo S. Rabello,
This work aims to analyze the effects of photodegradation on the stress cracking resistance of polystyrene. Injection moulded samples were exposed to the ultraviolet light for various times in the laboratory prior to solvent contact. The bars were then stressed in a tensile testing machine under the presence of butanol. During this period the stress relaxation was monitored and the ultimate properties were evaluated after selected periods of stress cracking. Complementary tests were done by size ...
Tópico(s): Recycling and Waste Management Techniques
2005 - Elsevier BV | Polymer Degradation and Stability
Produção Nacional
Revisado por pares
Tomás Jefférson Alves de Mélo, Sebastião V. Canevarolo,
Abstract Using an opticaldetector we followed the transient state of blends and composites, including a reactive blending during extrusion. The detection system is composed of a slit‐die with transparent windows fixed at the extruder exit, an optical arrangement with a W incandescent light microbulb with fixed luminescence, and a CdS photocell. As the tracer passes though the light path, it absorbs and backscatters part of the light, reducing the total transmitted light intensity. This is followed ...
Tópico(s): Electrohydrodynamics and Fluid Dynamics
2004 - Wiley | Polymer Engineering and Science
Produção Nacional
Edcleide Maria Araújo, Tomás Jefférson Alves de Mélo, Lisiane Navarro de Lima Santana, Gelmires de Araújo Neves, H. C. Ferreira, Hélio de Lucena Lira, Laura Hécker de Carvalho, M.M. A’vila, M.K.G. Pontes, Isabela Sousa de Araújo,
The influence of organoclay on the processing and mechanical properties of nylon 6 and polystyrene was investigated. A bentonite sample from Boa Vista/PB, Northeast of Brazil, was treated with alkyldimethylbenzylammonium chloride. After the treatment, the powder was characterized by thermal analysis and infrared spectroscopy. Composites were prepared by using a Torque rheometer. The results show the intercalation of quaternary ammonium salt in the structure of bentonite and organo-bentonite produced ...
Tópico(s): biodegradable polymer synthesis and properties
2004 - Elsevier BV | Materials Science and Engineering B
Produção Nacional
Tomás Jefférson Alves de Mélo, Laura Hécker de Carvalho, Ricardo B. Calumby, Keila G. Q. Brito, José Roberto Moraes d’Almeida, E. Spieth,
Neste trabalho o efeito da adição de 2 a 7% em peso de um copolímero tribloco estireno-b-etileno-co-butileno-b-estireno (SEBS) em uma blenda polipropileno/poliestireno de alto impacto (PP/HIPS) 70:30 foi determinado. As propriedades em tração e impacto, temperatura de amolecimento Vicat e morfologia da blenda PP/HIPS (70:30) em função da concentração de SEBS foram determinadas. As blendas foram processadas em extrusora dupla-rosca contra-rotativa interpenetrante e as amostras moldadas por compressão. ...
Tópico(s): Natural Fiber Reinforced Composites
2000 - Associação Brasileira de Polímeros | Polímeros