Transformation
Mostrando 25-36 de 10533 artigos, teses e dissertações.
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25. Influence of sintering parameters on the microstructure and mechanical properties of nanosized 3Y-TZP ceramics
Abstract The fracture toughness of 3Y-TZP ceramics obtained from a nanocrystalline powder with an optimized microstructure and highly transformable tetragonal grains was investigated. Samples of ZrO2-3 mol% Y2O3 were sintered at temperatures between 1250 and 1400 °C, with isothermal holding times of up to 16 h. Samples sintered at 1250 °C exhibited relativ
Cerâmica. Publicado em: 2021-03
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26. Thermal decomposition and reaction sintering for synthesis of mullite-zirconia composite using kaolin, γ-alumina and zirconia
Abstract The refractory materials used in the wall of the furnaces for glass melting can be prepared from mullite-zirconia composite material. The composite of mullite/zirconia was synthesized from Iraqi kaolin, γ-alumina, and zirconia using thermal decomposition with reaction sintering at 1600 °C. Several batches were prepared with various ratios of kaoli
Cerâmica. Publicado em: 2021-03
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27. Ultrasound reference values for the calcaneus of children and adolescents at moderate altitudes in Peru
Abstract Objective: a) Establish reference values for bone parameters by using the speed of sound (SOS, m/s) of broadband ultrasound attenuation (BUA, dB/MHz) and establish a bone quality index (BQI = αSOS + βBUA) for children and adolescents living in a region of moderate altitude, b) compare bone parameters with an international standard (with different
J. Pediatr. (Rio J.). Publicado em: 2021-02
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28. Towards Social Change: Social Transformation in a Time of Social Disruption
RESUMO Rumo à mudança social: Transformação social em um tempo de ruptura social discute o aprofundamento da atual crise capitalista em bases práticas/teóricas; sua superação não é simplesmente uma questão teórica, mas concreta. Enquanto o capitalismo dos EUA se torna mais agressivo, sua apreensão teórica foi historicamente suprimida e substitu
Dilemas, Rev. Estud. Conflito Controle Soc.. Publicado em: 2021-01
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29. Donovanosis,
Abstract Donovanosis is a chronic, progressive, and indolent bacterial disease that affects the skin and mucous membranes of the genital and perigenital regions, often associated with sexual transmission, and with low infectivity. The malignant transformation of donovanosis lesions occurs exceptionally, as is usually seen in long-term ulcerations.
An. Bras. Dermatol.. Publicado em: 2020-12
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30. Occupational reconstructions: resources for social transformation in challenging times
RESUMO A resistência genética é o mecanismo mais indicado para o controle dos nematoides-das-galhas em alface. No entanto são escassas na literatura informações sobre os níveis de resistência das principais cultivares de alface utilizadas atualmente no país. Dessa forma, o objetivo do trabalho foi caracterizar genótipos de alface quanto à resistê
Cad. Bras. Ter. Ocup.. Publicado em: 2020-09
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31. A Novel Tri-bandpass Filter Side-coupled Square Ring Based
Abstract This work presents the design of a tri-bandpass filter based on the side-coupled square ring structure. The modeling is conceived from the classic approach of coupled transmission lines. The geometry consists of a square structure of electrical length equal to twice the wavelength of the main operating frequency, and the laterally coupled lines thro
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2020-06
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32. Rhizobium rhizogenes-mediated transformation of Rhodiola rosea leaf explants
ABSTRACT Rhodiola rosea L. is an endangered medicinal plant distributed in mountains and in high latitude regions. For its conservation, sustainable methods for the obtaining of its bioactive compounds must be developed. This work hypothesized that leaf, stem and rhizome explants of R. rosea from different geographical origins respond differently to inoculat
Bragantia. Publicado em: 2020-06
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33. Optimization of shells modeled using NURBS subjected to a dynamic loading condition
Abstract This study presents an optimization method for the thickness of shell elements subjected to dynamic loads. Structural analyses were carried out using the finite element method. The analyzed domains were modeled using NURBS, and meshes were generated using a transformation of the parametric domain into the geometric domain via a geometric function. T
REM, Int. Eng. J.. Publicado em: 2020-03
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34. Drivers of floristic variation in biogeographic transitions: insights from the ecotone between the largest biogeographic domains of South America
ABSTRACT Ecological transitions usually represent vulnerable ecosystems and high biodiversity. Investigating their drivers is important from both biogeographic and conservationist perspectives. One of these transitions is situated between the two largest biogeographic domains of South America - the Amazon and the Cerrado. We evaluated variation in tree flori
Acta Bot. Bras.. Publicado em: 2020-03
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35. Accuracy of endocervical cytological tests in diagnosing preinvasive lesions of the cervical canal in patients with type 3 transformation zone: a retrospective observational study
ABSTRACT BACKGROUND: Cervical cancer screening in Brazil is done using Pap smears. Women who are most likely to have a preinvasive lesion or cervical cancer are immediately referred for colposcopy. OBJECTIVE: The aim of this study was to evaluate the diagnostic performance of endocervical cytological tests in diagnosing preinvasive cervical lesions in wo
Sao Paulo Med. J.. Publicado em: 2020-02
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36. ERRATUM
ABSTRACT BACKGROUND: Cervical cancer screening in Brazil is done using Pap smears. Women who are most likely to have a preinvasive lesion or cervical cancer are immediately referred for colposcopy. OBJECTIVE: The aim of this study was to evaluate the diagnostic performance of endocervical cytological tests in diagnosing preinvasive cervical lesions in wo
Sao Paulo Med. J.. Publicado em: 2020-02