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| Registros recuperados: 30 | |
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| Schreurs, Guido; Buiter, Susanne J. H.; Boutelier, Jennifer; Burberry, Caroline; Callot, Jean-paul; Cavozzi, Cristian; Cerca, Mariano; Chen, Jian-hong; Cristallini, Ernesto; Cruden, Alexander R.; Cruz, Leonardo; Daniel, Jean-marc; Da Poian, Gabriela; Garcia, Victor H.; Gomes, Caroline J. S.; Grall, Celine; Guillot, Yannick; Guzman, Cecilia; Hidayah, Triyani Nur; Hilley, George; Klinkmuller, Matthias; Koyi, Hemin A.; Lu, Chia-yu; Maillot, Bertrand; Meriaux, Catherine; Nilfouroushan, Faramarz; Pan, Chang-chih; Pillot, Daniel; Portillo, Rodrigo; Rosenau, Matthias; Schellart, Wouter P.; Schlische, Roy W.; Take, Andy; Vendeville, Bruno; Vergnaud, Marine; Vettori, Matteo; Wang, Shih-hsien; Withjack, Martha O.; Yagupsky, Daniel; Yamada, Yasuhiro. |
| We performed a quantitative comparison of brittle thrust wedge experiments to evaluate the variability among analogue models and to appraise the reproducibility and limits of model interpretation. Fifteen analogue modeling laboratories participated in this benchmark initiative. Each laboratory received a shipment of the same type of quartz and corundum sand and all laboratories adhered to a stringent model building protocol and used the same type of foil to cover base and sidewalls of the sandbox. Sieve structure, sifting height, filling rate, and details on off-scraping of excess sand followed prescribed procedures. Our analogue benchmark shows that even for simple plane-strain experiments with prescribed stringent model construction techniques,... |
| Tipo: Text |
Palavras-chave: Thrust wedges; Brittle wedges; Shear zones; Analogue modeling; Benchmarking; Critical taper; Sand; Friction; Cohesion. |
| Ano: 2016 |
URL: http://archimer.ifremer.fr/doc/00359/47011/51118.pdf |
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| Silva,Arthur P. da; Costa,Edilson; Espírito Santo,Tiago L. do; Silva,Luan E. da; Martins,Roberta F.. |
| The production of high-quality seedlings is a critical factor for successful implementation of a determined crop in the field. In order to evaluate the production of coffee seedlings, experiments were conducted with different substrates and in different protected environments. Treatments consisted of evaluation of the following substrates: 50% cattle manure + 50% commercial substrate, 50% cattle manure + 50% vermiculite, 50% commercial substrate + 50% vermiculite, 1/3 cattle manure + 1/3 commercial substrate + 1/3 vermiculite, 50% cattle manure + 50% sand, 1/3 sand + 1/3 cattle manure + 1/3 commercial substrate and 50% commercial substrate + 50% sand. These substrates were tested in different protected environments: agricultural greenhouse, mesh screen... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Coffee arabica; Cattle manure; Vermiculite; Commercial substrate; Sand. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162013000400001 |
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| Le Hir, Pierre; Cayocca, Florence; Waeles, Benoit. |
| Mixed sediments are constituted of cohesive and non-cohesive materials with distinct behaviours that numerical models traditionally manage separately. This paper first introduces a rapid state of the Art in sediment transport modelling in order to point out the specific requirements for process-based models applied to mixed sediments. Based on a preliminary study by Waeles et al. (2007), which showed the validity of the advection approach to compute fine sand transport, a complete modelling strategy is described: it is applied to the suspended transport of sand and mud mixtures, and accounts for consolidation of mixed sediments. Special care is paid to the realistic representation of the structure and density of sand and mud mixtures, and to the... |
| Tipo: Text |
Palavras-chave: Sediment transport modelling; Mixed sediment; Sand; Mud; Suspension; Consolidation. |
| Ano: 2011 |
URL: http://archimer.ifremer.fr/doc/00028/13952/12567.pdf |
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| Brahim., M.; Abdelfattah., A.. |
| Les analyses granulométriques des sédiments superficiels de la zone côtière située entre Ras Taguermess et Ras Marmours montrent que les petits fonds (-2 à -10 m) sont couverts par des sables fins aux sables grossiers (la moyenne est entre 0,39 et 3,34 ), généralement mal à très mal classés. Cependant, le haut de plage situé entre Ras Taguermess et Ras Marmour est couvert essentiellement par des sables fins et des sables moyens (la moyenne est entre 1,082 et 2,823 ). La répartition spatiale des sables ne montre pas un grano-classement décroissant ou croissant des sédiments de la côte vers le large. Cette distribution est due à l‘existence d’une énergie importante où la houle joue le rôle essentiel sur leur répartition. L’étude granulométrique montre aussi... |
| Tipo: Journal Contribution |
Palavras-chave: Beaches; Coastal zone; Grading; Grain size; Longshore sediment transport; Sand; Sediment analysis; Sediment texture; Sediments; Swell. |
| Ano: 2009 |
URL: http://hdl.handle.net/1834/4456 |
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| Nunes,JC; Carvalho,MM; Sugui,JK; Queiroz,FA; Santana,AE; Hata,ME; Aiura,ALO; Oliveira,JA; Queiroz,SA. |
| ABSTRACT The study aimed at evaluating the effect of litter substrates on the performance, carcass traits, and environmental comfort of red-winged tinamou (Rhynchotus rufescens). In this experiment, 160 birds, with 100 and 300 days of age, were housed into 20 pens, and distributed according to a completely randomized experimental design into five treatments with four replicates of eight birds each. Treatments consisted of five litter substrates: wood shavings, rice husks, peanut hulls, grass hay, or sand. Feed intake; weight gain; breast, hock, and footpad lesions; back feathering; total meat production; carcass and parts yield; and leukocyte counts were evaluated. Litter substrates were analyzed for dry matter content, standard microbial count, ammonia... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Grass hay; Leukocyte counts; Litter temperature; Radiant heat load; Sand. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2016000500041 |
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| Levy,Camila de Carvalho Braga; Mellis,Estêvão Vicari; Murrer,Marina Krey; Inglés,Carlos Repiso; Daynes,Cathal N.; Cavalli,Edilson; Chiba,Marcio Koiti. |
| ABSTRACT Although nickel (Ni) is recognized as plant nutrient since the turn of the 21st century, uncertainty remains about its optimum application rates and forms. This paper focuses on Ni application in soils, relating to its effect as a plant micronutrient. Specifically, the effect of Ni on the activity of urease in soybean plants is examined. The effects of applying four Ni rates in two different soil types were tested. A full factorial 2 × 4 blocked design experiment was established under controlled conditions. Ni rates (0, 0.25, 0.5 and1.0 mg of Ni·kg–1 of soil) were applied in two soils with contrasting clay contents. The addition of Ni increased the urease activity in soybean plants but was affected by soil textural differences. The highest urease... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Urease; Clay; Sand; Oxisol; Glycine max. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052019000300432 |
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| Rivas Rodríguez, L.; Caballero Camejo, V.; Izquierdo Álvarez, M.. |
| Actualmente la playa de Varadero, principal polo turístico de Cuba, no presenta los niveles de deterioro que mostraba en el año 1998. Sin embargo, existen ciertos sectores, ubicados entre Punta Chapelín y el canal de Paso Malo, con una longitud de 7 000 m., donde se observan evidencias de una erosión acelerada. Es por ello que se propone una nueva campaña de vertimientos que brinde especial atención a estos sectores. Luego de ser identificada la Cuenca de Mono II, como la zona de préstamo, y comprobar que reunía condiciones óptimas para su utilización, se hacia necesario demostrar la compatibilidad de ese sedimento con el que existe actualmente en los sectores erosionados, siendo este el principal objetivo del presente trabajo. Para ello se colectaron 56... |
| Tipo: Journal Contribution |
Palavras-chave: Sand; Sand; Http://aims.fao.org/aos/agrovoc/c_6779. |
| Ano: 2009 |
URL: http://hdl.handle.net/1834/3420 |
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| Guerra García, R. F.; Sosa Fernández, M.; Rivas Rodríguez., L.. |
| Los resultados que se muestran se obtuvieron a partir de un Programa de monitoreo de las variaciones morfológicas y sedimentológicas del perfil playa-duna del sector litoral comprendido entre el Mégano y la desembocadura del río Guanabo, al noreste de la ciudad de la Habana. El objetivo del presente trabajo fue conocer el comportamiento espacio-temporal del tamaño del grano, grado de selección de las partículas y su composición genética dando respuestas al desarrollo sedimentario de la playa. Se colectaron un total de 207 muestras de arena de la anteplaya en 16 perfiles de playa durante un monitoreo ejecutado desde septiembre del 2007 hasta septiembre del 2008, comparando además los resultados de su interpretación sedimentológica con los obtenidos en la... |
| Tipo: Journal Contribution |
Palavras-chave: Sand; Sand; Http://aims.fao.org/aos/agrovoc/c_6779. |
| Ano: 2009 |
URL: http://hdl.handle.net/1834/3422 |
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| Gualancañay, E.. |
| Se identificaron doce especies de foraminíferos bentónicos en la bahía de Santa Elena, Ecuador, correspondientes a mayo de 2006 y octubre de 2007. Las especies halladas son típicas de aguas poco profundas entre 4 y 20 metros de profundidad sobre sedimento arenoso y mezcla de arena y limo y son las siguientes: Cibicides aknerianus, Cibicides bertheloti f. boueana, Elphidium articulatum, Nonion pizarrense, Quinqueloculina agglutinans, Quinqueloculina granulosa, Quinqueloculina lamarckiana, Rotalia beccarii, Saccammina calcarea, Textulariella foliacea, Textularia secasensis y Trochammina advena. |
| Tipo: Journal Contribution |
Palavras-chave: Foraminifera; Shallow water; Sand; Mud; Sand; Mud; Http://aims.fao.org/aos/agrovoc/c_6779; Http://aims.fao.org/aos/agrovoc/c_4973. |
| Ano: 2009 |
URL: http://hdl.handle.net/1834/3359 |
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| Dufois, Francois; Le Hir, Pierre. |
| The capacity of an advection/diffusion model to predict sand transport under varying wave and current conditions is evaluated. The horizontal sand transport rate is computed by vertical integration of the suspended sediment flux. A correction procedure for the near-bed concentration is proposed so that model results are independent of the vertical resolution. The method can thus be implemented in regional models with operational applications. Simulating equilibrium sand transport rates, when erosion and deposition are balanced, requires a new empirical erosion law that involves the non-dimensional excess shear stress and a parameter that depends on the size of the sand grain. Comparison with several datasets and sediment transport formulae demonstrated the... |
| Tipo: Text |
Palavras-chave: Sand; 1DV model; Erosion rate; Suspended sediment transport. |
| Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00276/38763/37304.pdf |
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| Flórez,Sandra Liliana; Lasprilla,Diego Miranda; Chaves,Bernardo; Fischer,Gerhard; Magnitskiy,Stsnislav. |
| The effects of 0, 30 and 60 mM NaCl and substrates (red peat, sand or 3:1:1 [w/w] mixture of peat, sand, or soil) on vegetative growth of lulo, an Andean fruit species, during 12 weeks were studied. The experiment was carried out by using 2000 cm³ of polypropylene plastic pots under greenhouse conditions. Plant height, number of leaves and nodes, leaf area, total plant dry matter (DM), and shoot/root ratio were evaluated. With the increase of salt concentration, the plant height, the number of leaves and nodes, the leaf areas and plant dry mass DM decreased, whereas shoot/root ratio increased. Sand grown lulo plants were most affected by salinity and presented total mortality at 60 mM NaCl. On the other hand, plants held either in peat or in substrate... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Lulo; Naranjilla; Salinity; NaCl; Plant height; Leaf area; Dry matter; Peat; Sand. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452008000200023 |
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| Sanches,Cássio F.; Costa,Edilson; Costa,Geany G. S. da; Binotti,Flávio F. da S.; Cardoso,Eliana D.. |
| ABSTRACT The Brazilian copal is a tree fruit species that can be used for various purposes. The study evaluated protected environments and substrates in forming Brazilian copal seedlings (Hymenaea courbaril), at the State University of Mato Grosso do Sul, Cassilândia-MS, from January to March, 2014. Two greenhouses were used: (A1) agricultural greenhouse covered with aluminized thermal reflector screen of 50% shading and (A2) agricultural greenhouse covered with black screen of 50% shading. Inside the greenhouses, substrates derived from mixtures of cattle manure, soil, medium vermiculite, super fine vermiculite and washed fine sand were tested. For each cultivation environment, a completely randomized experimental design was used. The environments were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Hymenaea courbaril; Solar radiation; Reflective covered; Cattle manure; Vermiculite; Humus; Sand. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162017000100024 |
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| Fernandes,M.C.; Takai,S.; Leite,D.S.; Pinto,J.P.A.N.; Brandão,P.E.; Santarém,V.A.; Listoni,F.J.P.; Silva,A.V. Da; Ribeiro,M.G.. |
| The identification of pathogens of viral (Rotavirus, Coronavirus), parasitic (Toxocara spp.) and bacterial (Escherichia coli, Salmonella spp., Rhodococcus equi) origin shed in feces, and the virulence profile of R. equi and E. coli isolates were investigated in 200 samples of sand obtained from 40 parks, located in central region of state of Sao Paulo, Brazil, using different diagnostic methods. From 200 samples analyzed, 23 (11.5%) strains of R. equi were isolated. None of the R. equi isolates showed a virulent (vapA gene) or intermediately virulent (vapB gene) profiles. Sixty-three (31.5%) strains of E. coli were identified. The following genes encoding virulence factors were identified in E. coli: eae, bfp, saa, iucD, papGI, sfa and hly. Phylogenetic... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Enteric pathogens; Virulence; Sand; Feces; Parks; E. coli; R. equi. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822013000200025 |
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| Diaz, Melanie; Grasso, Florent; Le Hir, Pierre; Sottolichio, Aldo; Caillaud, Matthieu; Thouvenin, Benedicte. |
| Coastal environments are directly influenced by terrigenous inputs coming from rivers through estuaries. Quantifying the amount of nutrients and contaminants transported by sediments from continental areas to the sea is crucial for marine resources protection. However, the complexity of estuarine dynamics makes it difficult to quantify sediment fluxes from field measurements alone and requires numerical modeling. Thus, using a realistic 3D hydrodynamic and sediment transport model, this study aims at evaluating the influence of model empirical parameters on sediment fluxes and estimating uncertainties on mud and sand transfers at a macrotidal estuary mouth. A sensitivity analysis, considering changes in sediment transport parameters, revealed that the... |
| Tipo: Text |
Palavras-chave: Sensitivity analysis; Sediment fluxes; Numerical modeling; Mud; Sand; Gironde Estuary. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00617/72897/71906.pdf |
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| Williams, J.J.; Bell, P.S.; Thorne, P.D.; Trouw, K.; Hardcastle, P.J.; Humphrey, J.D.. |
| Measurements of hydrodynamic conditions and vertical suspended sediment concentration profiles, C-profiles, have been obtained above rippled sandy beds in a large wave flume. Measured values of wave height and period, water depth and sediment properties are used in well-known formulae to predict sediment dynamics and bed shear stresses due to waves. These data are then used in an existing convective model and a new model to predict C-profiles. Measured C-profiles and C-profiles predicted by the new model are shown to agree well for a range of grain sizes and wave conditions. Grain-scale bed roughness, defined using data from the model, is found to vary with the wave mobility number. Values for the wave mixing coefficient derived using the new model are... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Benthic boundary layer; Flow; Flow; Flow; Model studies; Oscillatory flow; Resuspended sediments; Sand; Sediment dynamics; Vertical profiles; Waves; Waves. |
| Ano: 2000 |
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=7388 |
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| Combatt-Caballero,Enrique Miguel; Palencia-L,Manuel; Borja-M.,Katerine. |
| Abstract The aim of this study was to evaluate the Bouyoucos method, at different stirring times and using two chemical dispersants, for particle size determination and distribution in slightly alkaline soils of Córdoba, Colombia. Eight soils were mechanically dispersed applying a slow stirring; 60 rpm with five stirring times as follows: 2, 4, 6, 10 and 16 hours and a control experiment at 0 h. Chemical dispersion of samples was performed using two dispersants: Calgon (0.058 molL-1 (NaPO3)6 + 0.075 molL-1 Na2CO3) and a mixture of Calgon and 0.1 molL-1 Na4P2O7 at pH 9.1, which was proposed by authors. In addition, particle size distribution was determined by Pipette method, which was used as reference method. Tests of means and regression models were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Stirring; Clay; Sand; Chemical dispersants; Silt; Texture; Timing. |
| Ano: 2018 |
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122018000100126 |
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| Registros recuperados: 30 | |
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