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| Registros recuperados: 31 | |
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| Anicua Sánchez, Rosa. |
| La producción de cultivos en maceta está relacionada con la selección de sustratos, que se basa en las propiedades físicas y en particular con el tamaño y la distribución de partículas, que determinan la retención y el movimiento de agua. Por lo que, el objetivo del presente trabajo fue la caracterización de materiales orgánicos e inorgánicos a partir de las propiedades físicas y micromorfológicas para la generación de mezclas en la producción de Lisianthus. Se realizó la caracterización de sustratos orgánicos (fibra de coco, peat moss, composta y vermicomposta) e inorgánicos (tezontle, piedra pómez, perlita y zeolita); con base en las propiedades físicas como densidad aparente (DA) y densidad real (DR) (Ansorena, 1994); espacio poroso total (EPT),... |
| Tipo: Tesis |
Palavras-chave: Sustratos; Curva de retención de humedad; Porosidad; Lisianthus; Micromorfología; Growing media; Waterrelease curve; Porosity; Lisianthus; Micromorphology. |
| Ano: 2008 |
URL: http://hdl.handle.net/10521/1408 |
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| Seguel,O; Baginsky,C; Contreras,A; Covarrubias,J; Gonzalez,C; Sandoval,M. |
| As an alternative to organic soil amendments used in the Copiapo Valley (northern Chile), this study analyzed the magnitude of changes in physical soil properties associated with different crop rotations on the rows on a grape orchard. The study was performed in the locality of Los Loros, Atacama Region, during the 2006-2008 seasons. In a Typic Haplocambid soil (2-5% slope, coarse loam) with a 6-year old grape plantation, a control and three crop rotations were established, each with four replicates. Soil samples were taken at three depths (0-10; 10-40; 40-60 cm), evaluating bulk density, penetration resistance, aggregate stability, pore size distribution and air and water flux. Crop rotation did not produce statistical differences in soil density compared... |
| Tipo: Journal article |
Palavras-chave: Porosity; Aggregate stability; Mechanical strength; Productivity. |
| Ano: 2011 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-95162011000100001 |
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| Winters, W. J.; Wilcox-cline, R. W.; Long, P.; Dewri, S. K.; Kumar, P.; Stern, L.; Kerr, L.. |
| The sediment characteristics of hydrate-bearing reservoirs profoundly affect the formation, distribution, and morphology of gas hydrate. The presence and type of gas, porewater chemistry, fluid migration, and subbottom temperature may govern the hydrate formation process, but it is the host sediment that commonly dictates final hydrate habit, and whether hydrate may be economically developed. In this paper, the physical properties of hydrate-bearing regions offshore eastern India (Krishna-Godavari and Mahanadi Basins) and the Andaman Islands, determined from Expedition NGHP-01 cores, are compared to each other, well logs, and published results of other hydrate reservoirs. Properties from the hydrate-free Kerala-Konkan basin off the west coast of India are... |
| Tipo: Text |
Palavras-chave: Physical properties; Gas hydrate; Porosity; Atterberg limits; Consolidation; Permeability; Shear strength; Scanning electron microscopy. |
| Ano: 2014 |
URL: https://archimer.ifremer.fr/doc/00289/40036/38799.pdf |
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| Wang, Fangqi; Qi, Faqing; Hu, Guanghai; Dong, Lifeng; Tao, Changfei. |
| The subbottom profiling is an important means of marine engineering survey, hazardous geology study and continental shelf scientific research. The accuracy of subbottom profile data interpretation has a direct impact on the research and investigation results. Because some of profilers’ transducer and hydrophone are separately installed, when the survey area is very shallow, distortion of shallow layers will be caused if it is seen as a self-excited and self-collected single-channel seismic system. According to the principle of subbottom profiler, the distortion correction formula is deduced and analyzed, providing actual value to using C-View software to interpret such subbottom profile data more accurately. In addition, the seabed sediments sound velocity... |
| Tipo: Journal Contribution |
Palavras-chave: Crustal thickness; Sound velocity; Porosity; Forecasting. |
| Ano: 2012 |
URL: http://hdl.handle.net/1834/5852 |
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| Mattei, Eloisa; Rabello de Oliveira, Paulo Sérgio; Costa Crusciol, Carlos Alexandre; Rocha de Moraes Rego, Carlos Augusto; Piano, Jeferson Tiago; da Silveira, Lucas. |
| Os sistemas integrados de produção lavoura-pecuária (SIPAs) em associação ao sistema de semeadura direta, sofrem ação do pisoteio animal ou do tráfego intenso de máquinas agrícolas, podendo resultar em alterações nas propriedades físicas do solo. O objetivo deste trabalho foi avaliar o efeito da adubação nitrogenada e manejos das forrageiras tropicais nas propriedades físicas do solo. O experimento foi realizado entre outubro de 2017 e janeiro de 2020, em Marechal Cândido Rondon – PR, em blocos ao acaso, com parcelas sub-subdivididas com uma testemunha adicional e quatro repetições. As parcelas foram constituídas por duas espécies forrageiras consorciadas com o milho: Urochloa brizantha e Magathyrsus maximum, mais a testemunha adicional (milho solteiro).... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Porosity; Soil physical quality; Resistance to penetration; Integrated systems; Porosidade; Qualidade física do solo; Resistência à penetração; Sistemas integrados. |
| Ano: 2021 |
URL: http://periodicosonline.uems.br/index.php/agrineo/article/view/6318 |
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| Saraiva,Claudety B.; Matos,Antonio T.; Matos,Mateus P.; Miranda,Suymara T.. |
| ABSTRACT We aimed to evaluate the efficiency of six different horizontal subsurface flow constructed wetlands (HSSF-CWs), with different substrates (gravel and crushed PET bottles), which also varied in relation to the presence and arrangement of plant species (elephant grass and Tifton 85 bermudagrass) in the removal of pollutants from a bulk milk cooling tank (MTWW). Each bed was fed at a flow rate of 0.18 m3 d-1 and average organic load rate (OLR) of 318 kg ha-1 d-1 of BOD5, with hydraulic detention time (HRT) of 1.84 days in the gravel-filled HSSF-CWs (CWS-G) and 2.97 days in the PET-filled HSSF-CWs (CWs-P). The CWs-P were as efficient as the CWs-G in the removal of BOD5, COD, Total-P, and K-Total, being in some cases even more effective (turbidity,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Wastewater; Elephant grass; Tifton 85 bermudagrass; Plants; Porosity. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162018000300417 |
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| Rech,Cleber; Albuquerque,Jackson Adriano; Corrêa,Juliano Corulli; Mafra,Alvaro Luiz; Bortolini,Diego. |
| Abstract: The objective of this work was to evaluate the superficial and injected applications of swine slurry and urea to the soil, regarding their effects on the physical properties of a Nitossolo Vermelho distroférrico under a no-tillage system. The treatments were: injected slurry into the groove with a liquid swine slurry injector (LSSI); slurry on surface, applied on the lines by the LSSI kept raised; urea injected by opening the groove with the LSSI and distributed manually; and corn, under no-tillage, as a control. Sowing and the injection of liquid slurry or urea do not modify the organic carbon content, pH, and aggregation, but alter the soil bulk density and porosity in the mobilized line, and increase the macropores. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Porosity; Soil structure; Urea. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2018000400518 |
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| VARAJÃO,CÉSAR A.C.; BRUAND,ARY; RAMANAIDOU,ERICK R.; GILKES,ROBERT J.. |
| Massive hematite ore (MHO) is a special high-grade iron ore, used as lump ore in the process of obtaining direct reduction iron (DRI). The influence of porosity on the reducibility of MHO from the Capitão do Mato Mine (Iron Quadrangle, Brazil) was investigated using optical and scanning electron microscopes on drill core and open pit samples. Hematite is the main component of the samples and occurs as granular crystals (10 mum), microplates (1 mum) and euhedral martite (10 to 30 mum). Quartz, maghemite, kenomagnetite and goethite are minor components. Primary micropores (Å to 1 mum) are associated with microplaty crystals that fill cavities between granular hematite. Secondary micropores (Å to 5 mum) related to euhedral martite crystals, are the most... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: BIF; Porosity; Massive hematite ore; Direct reduction iron; Reducibility. |
| Ano: 2002 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000100008 |
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| Centurion,José Frederico; Beutler,Amauri Nelson; Souza,Zigomar Menezes de. |
| The objective of this study was to assess the physical attributes of a kaolinitic oxisol, medium texture (Haplustox) and an oxidic oxisol, clayey (Eutrustox) under different usage systems, localized in the region of Jaboticabal, SP, Brazil. The usage systems were sugarcane, cotton and forest. Parameters such as soil bulk density, total porosity, macro and microporosity at the depths of 0.0-0.1; 0.1-0.2; 0.2-0.3, and 0.3-0.4 m were evaluated. Haplustox showed greater bulk density and smaller total porosity, macro and microporosity. The usage increased the bulk density in 0.0-0.3 m depth, with greater effects on the kaolinitic oxisol, mainly in 0.1-0.2 m depth in the areas cultivated with sugarcane. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Sugarcane; Cotton; Forest; Mineralogy; Porosity; Bulk density. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132004000500007 |
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| Machado,Walquíria; Telles,Tiago Santos; Tavares Filho,João; Guimarães,Maria de Fátima; Alves,Grace Bungenstab; Borges,José Luiz Bernardo. |
| This study had the purpose of evaluating the effects of two management types of sugarcane: harvesting of burnt cane (BCH) and mechanized harvesting of unburnt green cane (MCH), on some soil physical properties of a dystrophic Rhodic Haplustox. The data were then compared with results for the same soil type under native forest. A completely randomized design was used, with three treatments and 20 replications. The following characteristics were determined: organic matter, aggregate stability, soil bulk density, and porosity at depths of 0-0.20 m and soil penetration resistance. After 15 years of cultivation, there were some alterations in the soil under cane burnt before harvesting, evidenced by a drop in the weighted average diameter of stable aggregates... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Saccharum officinarum; Soil bulk density; Porosity; Soil penetration resistance; Soil aggregate stability. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832010000600004 |
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| Laurenceau-cornec, Emmanuel C.; Trull, Thomas W.; Davies, Diana M.; De La Rocha, Christina L.; Blain, Stephane. |
| During the second KErguelen Ocean and Plateau compared Study (KEOPS2) in October-November 2011, marine snow was formed in roller tanks by physical aggregation of phytoplankton assemblages sampled at 6 stations over and downstream of the Kerguelen Plateau. Sinking velocities, morphology, bulk composition (transparent exopolymer particles, biogenic silica, particulate organic carbon), and phytoplankton contents were measured individually on 66 aggregates to identify controls on sinking velocities. Equivalent spherical diameters (ESD) ranged from 1 to 12 mm, and the particle aspect ratios, Corey shape factors, and fractal dimensions (D-F1 = 1.5, D-F2 = 1.8) were close to those of smaller natural aggregates (0.2 to 1.5 mm) collected in polyacrylamide... |
| Tipo: Text |
Palavras-chave: Sinking velocity Marine snow; Aggregation; Phytoplankton; Porosity. |
| Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00352/46275/46044.pdf |
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| CARVALHO JUNIOR, O. A. de; CARDOSO, F. B. da F.; MARTINS, E. de S.; JUNQUEIRA, F. de F.; CARVALHO, A. P. F. de; REATTO, A.; GUIMARAES, R. F.. |
| RESUMO: Este trabalho apresenta uma abordagem metodológica para obter o índice de vazios de solo (e) utilizando técnicas de processamento de imagens. Como esse método permite uma obtenção automática, o procedimento pode ser considerado mais fácil, mais rápido e mais preciso que técnicas convencionais. A metodologia está baseada na classificação supervisionada de áreas de vazios presentes em seções delgadas de solo. A metodologia pode ser resumida nos passos seguintes: (a) elaboração de seção delgada da amostra de solo (se a porosidade do solo tiver um padrão anisotrópico, várias lâminas devem ser confeccionadas seguindo o eixo de comprimento preferencial; (b) são fotografadas as seções delgadas e gravadas em formato digital em RGB; (c) a imagem colorida é... |
| Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E) |
Palavras-chave: Imagem digital; Digital image; Chemicophysical properties.; Cerrado; Propriedade Físico-Química; Porosidade; Sensoriamento Remoto; Solo.; Remote sensing; Porosity; Soil.. |
| Ano: 2002 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/567773 |
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| Registros recuperados: 31 | |
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