Boron
Mostrando 1-12 de 459 artigos, teses e dissertações.
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1. Characterization and potential applications of new boron-phosphate glass in the CaO-P2O5-K2O-B2O3 system
Abstract Boron phosphate glasses are known for their unique properties and have been investigated as biodegradable materials for biomedical applications. In this context, the present research studied the characterization of physical, mechanical, and bioactive properties of new boron-phosphate glass in the CaO-P2O5-K2O-B2O3 system produced by the melt-quenchi
Cerâmica. Publicado em: 2022
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2. Selective formation of neodymium phosphate from iron-neodymium magnet waste
Abstract Neodymium-iron-boron alloy, Nd2Fe14B, is used as a material for magnets. Neodymium is one of the valuable and expensive rare earth elements and is often recovered to reduce costs and environmental impact. Recently, a method for recovering neodymium as neodymium phosphate from mixed solutions was reported. This method was very useful because the main
Cerâmica. Publicado em: 2022
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3. Calcium and boron foliar application in the production and quality of sweet pepper seeds
RESUMO O cálcio e o boro são nutrientes importantes na formação do grão de pólen e na produção de sementes. Por serem pouco móveis nas plantas, é comum o fornecimento via aplicação foliar. Objetivou-se com este trabalho avaliar a produção e qualidade das sementes de pimentão em função da aplicação de cálcio e boro direcionado às flores e
Horticultura Brasileira. Publicado em: 2022
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4. DETERMINATION OF TOTAL AND BIOACCESSIBLE ELEMENTS IN TEMPORARY ADHESIVE TATTOOS USED BY CHILDREN AND ADULTS
The presence of bioaccessible potentially-toxic elements in five different brands of temporary tattoos (packaged with bubble gums) aimed at children and three product brands used by young and adult audiences were analyzed in accordance with the Brazilian Organization of Technical Standards (ABNT) and International Organization for Standardization (ISO) for t
Química Nova. Publicado em: 2022
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5. BORON AND ZINC FERTILIZER APPLICATION TO MAIZE CROPS IN A LITHIC QUARTZIPSAMMENT
RESUMO O objetivo desse trabalho foi avaliar o efeito da aplicação via solo de doses de boro (B), com ou sem adubação com zinco (Zn), sobre o crescimento, componentes de produção e produtividade do Milho em Neossolo Litólico distrófico, com baixos teores de B e Zn. O delineamento experimental utilizado foi blocos casualizados, em esquema fatorial 6 x
Revista Caatinga. Publicado em: 2022
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6. Microstructure and diametral fracture strength of spark plasma sintered WC-6Co-0.2B and WC-6Co-0.5B ceramic composites from nanosized and metastable WC powders
Abstract The present work aimed at evaluating the microstructures and mechanical properties of spark plasma sintered WC-6 wt% Co ceramic composites doped with boron (0.2 and 0.5 wt%). W-50 at% C (W-6.13 wt% C) powders produced under different milling times (20, 60, 180, and 600 min) were used as starting materials and subsequently mixed with Co (6 wt%) and B
Cerâmica. Publicado em: 2022
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7. Study of Crystallization and Composition on Silicon Oxycarbide (SiOC) and Silicon Boron Oxycarbide (SiBOC) Ceramics Obtained from Alkoxysilanes Precursors
This work deals on the preparation of silicon oxycarbide (SiOC) and silicon boron oxycarbide (SiBOC) ceramics from pyrolysis involving alkoxysilanes with different organic groups. Boron content, organic substituent and annealing time were evaluated on crystallization and composition of resulting ceramics. B-free precursors composed of methyltriethoxysilane (
J. Braz. Chem. Soc.. Publicado em: 2021-06
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8. Después de la pandemia: ¿antesala del socialismo o del “capitalismo recargado”?
Resumo: Con más de un millón de muertos a causa del coronavirus a nivel mundial y casi 154.000 en Brasil, no quedan dudas que el orden mundial del pasado y, más que ello, las viejas formas de sociabilidad y organización de la vida económica han sido ya profundamente modificadas y lo serán aún más cuando la pandemia sea finalmente derrotada. Las socie
Serv. Soc. Soc.. Publicado em: 2021-04
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9. Nutritional quality and sensory attributes of date palm spathes beverage supplemented with pollen grains
Abstract The aim of this study was to fortify date palm spathes beverage with pollen grains. The nutritional quality and sensory attributes of the developed products were evaluated. The results showed that pollen grains significantly (P < 0.05) influenced the nutritional and sensory qualities of date palm spathe beverages. With minor exceptions, fortificatio
Food Sci. Technol. Publicado em: 2020-12
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10. Escala de Depressão, Ansiedade e Estresse: propriedades psicométricas e prevalência das afetividades
In this study we have expanded upon a family of substituted pentacyclic oxadiazadiborinane derivatives from the condensation of carbohydrazide with ortho-formylphenyl boronic acid derivatives containing a variety of chemical and physical properties. All new complexes have been characterized fully including two single crystal X-ray diffraction studies which c
J. bras. psiquiatr.. Publicado em: 2020-07
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11. Challenges in Pharmacological Management of Cardiovascular Diseases in Covid-19: do Benefits Outweigh Risks?
In this study we have expanded upon a family of substituted pentacyclic oxadiazadiborinane derivatives from the condensation of carbohydrazide with ortho-formylphenyl boronic acid derivatives containing a variety of chemical and physical properties. All new complexes have been characterized fully including two single crystal X-ray diffraction studies which c
Int. J. Cardiovasc. Sci.. Publicado em: 2020-07
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12. Synthesis, Characterization and Antimicrobial Activities of Pentacyclic Oxadiazadiborinanes
In this study we have expanded upon a family of substituted pentacyclic oxadiazadiborinane derivatives from the condensation of carbohydrazide with ortho-formylphenyl boronic acid derivatives containing a variety of chemical and physical properties. All new complexes have been characterized fully including two single crystal X-ray diffraction studies which c
J. Braz. Chem. Soc.. Publicado em: 2020-07