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Mostrando 1-12 de 1700 artigos, teses e dissertações.
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1. Estudo sobre envelhecimento acelerado de propelente sólido compósito
O propelente sólido é uma mistura complexa e estável de ingredientes oxidantes e redutores, que ao entrarem em ignição, reagem entre si, formando moléculas gasosas a altas temperaturas. A estocagem de motores-foguetes carregados com propelente sólido compósito por longos períodos pode modificar propriedades de projeto, podendo ocasionar falhas, afet
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2026
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2. Catalysts Derived from Thermal Treatments of Hydrocalumite-Type Compounds: Synthesis and Application in Transesterification Reactions
Catalyst performance is a relevant factor in biodiesel production because it can affect the efficiency of the process. This work provides a study of the performance of heterogeneous catalysts for biodiesel production derived from thermal-treated hydrocalumite-type compounds. This work aimed to synthesize and characterize hydrocalumite-type compounds intercal
Journal of the Brazilian Chemical Society. Publicado em: 2023
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3. 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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4. Catalytic Effects of Ruthenocene Bimetallic Compounds Derived from Fused Aromatic Ring Ligands on the Main Oxidizing Agent for Solid Rocket Motor
We report the catalytic effect of three ruthenocene bimetallic compounds derived from fused aromatic rings of general formula [{Cp*Ru}2L], with Cp*: pentamethylcyclopentadiene and L = pentalene (1), 2,6-diethyl-4,8-dimethyl-s-indacene (2), and 2,7-diethyl-as-indacene (3), on the thermal decomposition of ammonium perchlorate (AP). The new compound 3 was chara
Journal of the Brazilian Chemical Society. Publicado em: 2022
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5. Milling parameters and solid waste characterisation to use as supplementary cementitious materials
Resumo Embora a utilização de matérias-primas residuais como materiais cimentícios suplementares (MCS) seja uma temática crescente na literatura, o processo de beneficiamento por moagem e seus parâmetros ainda são pouco explorados e apresentados.Nesse contexto, o presente estudo visa avaliar os parâmetros de moagem para o beneficiamento dos resíduos
Ambiente Construído. Publicado em: 2022
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6. Doxazosin adsorption in natural, expanded, and organophilized vermiculite-rich clays
Abstract Vermiculite clays are adsorbent materials that have good chemical adsorption capacity, which makes them applicable in the removal of drugs from aqueous solutions. Their lamellar structure can be easily expanded and organophilized. To assess the efficacy and environmentally-tolerant capacity of the adsorption method, the organophilized vermiculite cl
Cerâmica. Publicado em: 2022
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7. Formulação de massa cerâmica para revestimento poroso utilizando resíduos de madeiras tropicais
Resumo Os resíduos de pó das madeiras tropicais Angelim rajado (AR) (Pithecelobium racemosum Ducke) e Sucupira vermelha (SV) (Andira parviflora Ducke) gerados na indústria madeireira em Itacoatiara - AM quando não são utilizados pela própria empresa para geração de energia são depositados em locais inadequados. Em vista disso, neste trabalho, a argi
Ciência Florestal. Publicado em: 2022
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8. Intervalo hídrico ótimo e valores críticos de densidade como indicadores de recuperação de um solo sob sistemas florestais e pasto
Resumo O intervalo hídrico ótimo (IHO) é um indicador de qualidade física do solo para o crescimento de plantas determinado não só pela disponibilidade de água, mas também pela aeração e resistência que o solo oferece à penetração das raízes. O objetivo do trabalho foi avaliar a eficiência da revegetação com as leguminosas arbóreas Acácia
Ciênc. Florest.. Publicado em: 2021-06
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9. A Greener Enzymatic Oligoesterification of Biobased Renewable Synthons
Polyesters of xylitol and succinic acid were prepared yielding from 70 to 75% by enzyme-catalyzed esterification using a molar mass from 1:1 to 2:5 at 120 and 140 °C employing from 1 to 10% m/m of enzyme. Control over branching degree was achieved by tuning the reaction conditions (temperature, time, comonomer ratio, enzyme content). This one-step process f
J. Braz. Chem. Soc.. Publicado em: 2021-06
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10. ERRATUM
This study described the morphology, crystallinity, thermal and mechanical characterization of Polyamide 11 (PA11) porous film prepared by non-solvent induced phase separation (NIPS) method using formic acid (FA) as solvent. In addition, the miscibility of PA11/FA/H2O system was performed to generate a ternary phase diagram. The porous films morphology was i
Arq. Neuro-Psiquiatr.. Publicado em: 2021-06
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11. ERRATA
Abstract After natural fermentation and solar drying, sour cassava starch acquires expansion property. Traditionally, solar drying occurs without protection, and consequently physical contamination can arise. Thus, the aim of this study was to produce sour cassava starch using a low-cost solar dryer to prevent contamination, whilst retaining the expansion pr
Rev Bras Med Esporte. Publicado em: 2021-06
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12. Polyamide 11 porous films by NIPS: the influence of miscibility and polymer crystalline formation in pores structure and morphology
This study described the morphology, crystallinity, thermal and mechanical characterization of Polyamide 11 (PA11) porous film prepared by non-solvent induced phase separation (NIPS) method using formic acid (FA) as solvent. In addition, the miscibility of PA11/FA/H2O system was performed to generate a ternary phase diagram. The porous films morphology was i
Quím. Nova. Publicado em: 2021-06