scholarly journals Comparison and study on the asymmetric uranyl—salophen to the single carbonyl molecules

2020 ◽  
Vol 1486 ◽  
pp. 052019
Author(s):  
Wen-Bo Lan ◽  
Xiao-Feng Wang ◽  
Li-Ping He ◽  
Qian-Ru Li ◽  
Yan-Bin Meng ◽  
...  
Keyword(s):  
1999 ◽  
Vol 288 (1-2) ◽  
pp. 111-119 ◽  
Author(s):  
Maribel Sánchez ◽  
Francesca Canalias ◽  
Teresa Palencia ◽  
F.-Javier Gella

Author(s):  
Ênio Henrique Pires da Silva ◽  
Emiliano Barretto Almendro ◽  
Amanda Albertin Xavier da Silva ◽  
Guilherme Waldow ◽  
Flaminio CP Sales ◽  
...  

Composites using natural fibers as reinforcement and biodegradable polymers as matrix are considered environmentally friendly materials. This paper seeks the mechanical and morphological characterization of a biocomposite of polyurethane (PU) derived from a blend of vegetable oils doped with aluminatrihydrate (ATH) and reinforced with hydrated cotton fiber fabric (HCF). The comparison and study were performed based on the properties of the: (i) pure PU; (ii) PU doped with ATH containing 30% of the final mass (PU+30%ATH); (iii) composite of PU reinforced with 7 layers of cotton fiber fabric (PU+7CF); (iv) composite of PU+30%ATH reinforced with 7 layers of CF (PU+30%ATH+7CF); (v) composite of PU+30%ATH reinforced with 7 layers of hydrated cotton fiber fabric (PU+30%ATH+7HCF). The mechanical properties obtained according to the tensile test for the composite PU+30%ATH+CF with fibers oriented at 0° showed a significant increment in tensile strength (60 MPa) and the modulus of elasticity (4.7 GPa) when compared to pure PU (40 MPa) and (1.7 GPa) respectively. PU+30%ATH also presented a rising tensile strength (31 MPa) and Young modulus (2.6 GPa). For the composite with addition of water, results presented a significant decrease in strength (31.3 MPa) and stiffness (0.9 GPa) than the composite with no water. Electron microscopy (SEM) analyses exhibited that the samples with addition of water showed the presence of large amounts of pores and the lower interaction between matrix and fiber. These results may explain the lower mechanical properties of this material. DOI: http://dx.doi.org/10.30609/JETI.2019-7576


1994 ◽  
Vol 50 (8) ◽  
pp. 1073
Author(s):  
Shogo Azemoto ◽  
Yun Shen ◽  
Tetsuya Horiuchi ◽  
Makoto Gohno ◽  
Natsuko Sato

2019 ◽  
Author(s):  
Evelyn Yumbo- Vasquez ◽  
Carolina Llulluna-Masabanda ◽  
Estefania Solis ◽  
Pedro Rios-Guayasamin
Keyword(s):  

2017 ◽  
Vol 4 ◽  
pp. 9-27
Author(s):  
José Alexander Pinzón Rivera

Resumen: El presente artículo responde al cuestionamiento ¿cuál ha sido evolución constructiva del conjunto arquitectónico de Las Aguas durante el periodo colonial?. La respuesta incluyó la identificación, transcripción, comparación y estudio de las fuentes primarias y secundarias: escritos de otros autores, planos, grabados, fotografías, levantamientos. El estudio comparativo permitió identificar acontecimientos como el inicio, los cambios y las permanencias de una construcción que en términos generales surge en medio del proceso de evangelización en la capital del Nuevo Reino y va cambiando de usos frente a hechos como las luchas de independencia, las guerras civiles del siglo XIX y epidemias como la viruela. ___Palabras clave: Arquitectura colonial, Iglesias doctrineras, Conventos, Dominicos, Hospital militar, molinos. ___Abstract: This article responds to the question “what was the constructive evolution of the Architectural Cooperative of ´Las Aguas´, during the colonial period?”  The response to this question includes: the identification, transcription, comparison and study of primary and secondary sources, writings of other authors, plans, prints, photographs and surveys. The comparative study made it possible to identify events such as the beginning, changes and permanence of a construction that in general terms arose in the midst of the process of evangelization in the capital of the “Nuevo Reino.” additionally, during this period the article addresses changes the architectural cooperatives implemented in relation to events such as the struggles for independence, Civil wars of the XIX (19th) Century and epidemics such as smallpox. ___ Keywords: Architecture religious, Doctriners churches, Convents, Dominicos, Military Hospital, Mills. ___Resumo: Este artigo responde ao questionamento sobre o que foi a evolução construtiva do conjunto arquitetônico das Aguas durante o período colonial? A resposta incluiu a identificação, transcrição, comparação e estudo de fontes primárias e secundárias: escritos de outros autores, planos, impressões, fotografias, pesquisas. O estudo comparativo permitiu identificar eventos como a iniciação, mudanças e permanência de uma construção que, em termos gerais, surge no meio do processo de evangelização na capital do Novo Reino e foi mudando seus usos em face de eventos como lutas pela independência, guerras civis do século 19 e epidemias como a varíola. ___Palavras-chave: Arquitetura colonial, igrejas de doutrina, conventos, dominicanos, hospital militar, moinhos. ___Recibido: 9 de junio 2017. Aceptado: 14 de julio de 2017.


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