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| Registros recuperados: 15 | |
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| CRUVINEL,PAULO ESTEVÃO. |
| This paper describes a low-cost microprocessed instrument for in situ evaluating soil temperature profile ranging from -20.0°C to 99.9°C, and recording soil temperature data at eight depths from 2 to 128 cm. Of great importance in agriculture, soil temperature affects plant growth directly, and nutrient uptake as well as indirectly in soil water and gas flow, soil structure and nutrient availability. The developed instrument has potential applications in the soil science, when temperature monitoring is required. Results show that the instrument with its individual sensors guarantees ±0.25°C accuracy and 0.1°C resolution, making possible localized management changes within decision support systems. The instrument, based on complementary metal oxide... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil management equipment; Thermal properties; Microprocessors; Sensors. |
| Ano: 2000 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2000001100020 |
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| TELES, V. C.; ROLDI, M.; LUZ, S. M.; SANTOS, W. R. dos; ANDREANI, L.; VALADARES, L. F.. |
| Abstract: Starch and celluloses are biodegradable resources of great importance in terms of marketing. These biopolymers can be used to generate films with interesting mechanical, optical, and thermal properties, which can substitute for plastic films in certain applications, e.g., packaging materials. This study describes the preparation of pure plasticized starch films, prepared from soluble starch and glycerol, and the preparation of microfibrillated cellulose films from oil palm empty fruit bunches fabricated via casting. Composites made of plasticized starch were also prepared with microfibrillated cellulose added in 10% increments. The density, color difference, opacity, morphology, water activity, water affinity, and thermal and mechanical... |
| Tipo: Artigo de periódico |
Palavras-chave: Plasticized starch films; Microfibrillated cellulose; Oil palm empty fruit bunches; Amido; Celulose; Biofilme; Cellulose; Starch; Mechanical properties; Thermal properties; Oil palm products. |
| Ano: 2021 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1131171 |
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| ASCHERI, D. P. R.; MOURA, W. de S.; ASCHERI, J. L. R.; CARVALHO, C. W. P. de. |
| O presente trabalho teve por objetivos avaliar a composição de rizomas do lírio-do-bejo (Hedychium coronarium) e isolar e caracterizar seu amido, por meio de análises físicas e físico-químicas. A composição química dos grânulos de amido isolados dos rizomas também foi determinada, bem como o formato, tamanho, distribuição de tamanho de partícula por difração a laser, viscosidade de pasta em analisador rápido de viscosidade, poder de inchamento, índice de solubilidade em água, propriedade térmica por calorimetria diferencial de varredura e cristalinidade por difração de raios X. Observouse que os rizomas apresentaram elevado teor de água e baixos teores de matéria graxa, carboidratos, cinzas, proteínas e fibras. Os rizomas de lírio-do-brejo apresentam-se... |
| Tipo: Separatas |
Palavras-chave: Viscosidade de pasta; Lírio-do-brejo; Propriedade térmica do amido; Propriedade funcional.; Propriedade físico-química; Starch; Thermal properties; Hedychium coronarium.. |
| Ano: 2010 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/867979 |
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| SANTOS,Thais Paes Rodrigues dos; FRANCO,Célia Maria Landi; MISCHAN,Martha Maria; LEONEL,Magali. |
| Abstract Native cassava starch was gelatinized under different pretreatment conditions (preheating temperature, starch concentration and heating time) and spray-dried. A rotational compound central design was used to test the three independent variables: the preheating temperature, starch concentration, and heating time, and the behavior of the system was assessed by response surface methodology. The results showed a significant effect of both the preheating temperature and heating time on the cold viscosity. The combination of the preheating temperature and starch concentration affected the crystallinity, enthalpy change, solubility, and final viscosity. Modification by spray-drying resulted in a decrease in the crystalline regions, and enthalpy change,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Morphology; X-ray diffraction; Thermal properties; Pasting properties; Pregelatinization. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612019000400939 |
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| SOARES,Maiara Aparecida Bomfim; JORGE,Luiz Mario de Matos; MONTANUCI,Flávia Daiana. |
| Abstract This study aimed to assess the drying kinetics of barley grains and, using mathematical modeling, to evaluate the diffusivity during drying and after drying to evaluate the effect of high drying temperatures on the seed germination index for malt production. Three drying temperatures 40, 60 and 80°C were used. The last two, 60 and 80°C, reached moisture close to ideal for storage with 6 and 4 hours respectively; at 40°C, drying process took 12 hours and would still take additional hours to reach 13% moisture on a dry basis. Drying temperature influenced the germination power. The protein content was reduced according to increased drying time. The diffusivity coefficient was higher in conventional than in intermittent drying, probably due to heat... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Malt; Diffusivity; Thermal properties. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612016000400638 |
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| HU,Pan; FAN,Xiaoxu; LIN,Lingshang; WANG,Juan; ZHANG,Long; WEI,Cunxu. |
| Abstract Rice starches with different amylose contents were treated with sodium dodecyl sulfate (SDS) to deplete surface proteins and lipids, and the changes in molecular structure, thermal properties, and enzymatic hydrolysis were evaluated. SDS treatment did not significantly change the molecular weight distribution, crystalline structure, short-range ordered degree, and gelatinization properties of starch, but significantly altered the pasting properties and increased the swelling power of starch. The removal of surface proteins and lipids increased the enzymatic hydrolysis and in vitro digestion of starch. The influences of removing surface proteins and lipids from starch on swelling power, pasting properties, and enzymatic hydrolysis were different... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Enzymatic hydrolysis; Molecular structure; Rice starch; Surface proteins and lipids; Thermal properties. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612018000100084 |
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| Cabral,Renato Alexandre Ferreira; Orrego-Alzate,Carlos Eduardo; Gabas,Ana Lúcia; Telis-Romero,Javier. |
| Rheological and thermophysical properties were determined for blackberry juice, which was produced from blackberry fruit at 9.1 ± 0.5 °Brix and density of 1.0334 ± 0.0043 g cm-3. The concentration process was performed using a roto evaporator, under vacuum, to obtain concentrated juice at about 60 °Brix. In order to obtain different concentrations, concentrated juice was diluted with distilled water. Rheological measurements were carried out using a Rheotest 2.1 Searle type rheometer. In the tested ranges, the samples behaved as pseudoplastic fluids, and the Power-Law model was satisfactorily fitted to the experimental data. The friction factor was measured for blackberry juice in laminar flow conditions of pseudoplastic behavior. Thermal conductivity,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fruit juice; Rheology; Thermal conductivity; Thermal properties. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612007000300025 |
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| Shuai,Cijun; Nie,Yi; Gao,Chengde; Lu,Haibo; Hu,Huanlong; Wen,Xuejun; Peng,Shuping. |
| Cracks often occur when nano-hydroxyapatite bone scaffolds are fabricated with selective laser sintering, which affect the performance of scaffolds. In this study, a small amount of poly (l-lactide acid) (PLLA) was added into nano-hydroxyapatite (nano-HAP) powder by mechanical blending in order to improve the sintering properties. The nano-HAP powder combined with 1wt % PLLA was sintered under different laser power (5W, 7.5W, 10W, 12.5W, 15W and 20W). The fabricated scaffolds were characterized using Scanning Electron Microscope (SEM), X-ray Diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR) and Micro Hardness Tester. The results showed that nano-HAP particles grew up quickly with the laser power increasing, and there were many strip-like... |
| Tipo: Journal article |
Palavras-chave: Hardness; Microstructure; Nano-hydroxyapatite; Thermal properties. |
| Ano: 2012 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000600004 |
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| Registros recuperados: 15 | |
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