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| Registros recuperados: 473 | |
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| Kumarappan, Subbu; Ivanic, Rasto. |
| When the lignocellulosic biofuels industry reaches maturity and many types of biomass sources become economically viable, management of multiple feedstock supplies – that vary in their yields, density (tons per unit area), harvest window, storage and seasonal costs, storage losses, transport distance to the production plant – will become increasingly important for the success of individual enterprises. The manager’s feedstock procurement problem is modeled as a multi-period sequence problem to account for dynamic management over time. The case is illustrated with a hypothetical 53 million annual US gallon cellulosic ethanol plant located in south west Kansas that requires approximately 700,000 metric dry tons of biomass. The problem is framed over 40... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Cellulosic ethanol; Feedstock; Switchgrass; Miscanthus; Corn stover; Optimization; Biofuels; Biomass; Energy; Renewable; Agribusiness. |
| Ano: 2009 |
URL: http://purl.umn.edu/49407 |
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| ADUAN, R. E.; VILELA, M. de F.; KLINK, C. A.. |
| ABSTRACT: In the Cerrado Biome, the internal carbon cycling, the main carbon pools size, and the fluxes intensity between carbon pools are far from to be completely understood. This study presents the main carbon pools and cycling fluxes in terrestrial ecosystems, emphasizing the neotropical savannas. This study will also review literature of internal carbon cycling in the Cerrado. In spite of the science advances, the knowledge of internal carbon dynamics in the Cerrado are scarce. The relation between the carbon pools size and fluxes intensity and the Cerrado's vegetation phytofisionomies, soil gradient, and climate still remains unknown. The carbon pools and fluxes data analysis show that the Cerrado's aerial carbon pools are smaller than the forest... |
| Tipo: Documentos (INFOTECA-E) |
Palavras-chave: Fluxo de carbono; Carbon fluxes; Carbon cycling.; Biomassa; Cerrado; Matéria Orgânica; Serapilheira; Solo.; Biomass; Organic matter; Soil.. |
| Ano: 2003 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/569012 |
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| Sarrazin, Jozee; Walter, Cecile; Sarradin, Pierre-marie; Brind'Amour, Anik; Desbruyeres, Daniel; Briand, Patrick; Fabri, Marie-claire; Van Gaever, S; Vanreusel, A; Bachraty, Charleyne; Thiebaut, E. |
| The composition, biomass and diversity of the fauna in a Bathymodiolus thermophilus mussel assemblage colonizing diffuse flow areas on the SEPR is described and compared with biological characteristics of other hydrothermal assemblages. The spatio-temporal dynamics of temperatures over fine scales within the mussel habitat are characterized using newly-developed statistical approaches. Temperature data obtained from two adjacent habitats (a cirriped assemblage and a bare substratum) are compared. The results of the temperature data show that the mean temperature and the temperature variations were significantly higher in the mussel assemblage (mean temperature: 4.12 +/- 1.85 degrees C) in comparison with 2.40 +/- 0.14 degrees C in the cirriped assemblage... |
| Tipo: Text |
Palavras-chave: East Pacific Rise; Temperature dynamics; Biomass; Diversity; Bathymodiolus thermophilus; Mussel assemblage; Hydrothermal vents. |
| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/2006/publication-3570.pdf |
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| Leclerc, Jean-charles; Riera, Pascal; Laurans, Martial; Leroux, Cedric; Leveque, Laurent; Davoult, Dominique. |
| Worldwide kelp forests have been the focus of several studies concerning ecosystems dysfunction in the past decades. Multifactorial kelp threats have been described and include deforestation due to human impact, cascading effects and climate change. Here, we compared community and trophic structure in two contrasting kelp forests off the coasts of Brittany. One has been harvested five years before sampling and shelters abundant omnivorous predators, almost absent from the other, which has been treated as preserved from kelp harvest. δ15N analyses conducted on the overall communities were linked to the tropho-functional structure of different strata featuring these forests (stipe and holdfast of canopy kelp and rock). Our results yielded site-to-site... |
| Tipo: Text |
Palavras-chave: Laminaria hyperborea; Community cascade; Stable isotopes; Biomass; Suspension-feeders; Omnivorous predators. |
| Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00226/33747/32161.pdf |
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| ROSALES LOAIZA,Néstor; VERA,Patricia; AIELLO-MAZZARRI,Cateryna; MORALES,Ever. |
| Nitrogen concentration is an essential parameter in cyanobacterial cultures to produce enriched biomass with biotechnological purposes. Growth and biochemical composition of Nostoc LAUN0015, Nostoc UAM206, Anabaena sp.1 and Anabaena sp.2 were compared at 0, 4.25, 8.5 and 17 mM NaNO3. Cultures under laboratory conditions were maintained for 30 days at a volume of 500 mL. Anabaena sp.1 yielded the highest value of dry mass of 0.26 ± 2.49 mg mL-1 at 8.5 mM NaNO3. For chlorophyll, phycocyanin and phycoerythrin, maximum values were achieved at 17 mM NaNO3 with 18.09 ± 1.74, 102.90 ± 6.73 and 53.47 ± 2.40 μg mL-1, respectively. Nostoc LAUN0015 produced its maximum value of protein 644.86 ± 19.77 μg mL-1, and 890 mg mL-1 of carbohydrates in the absence of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Anabaena; Biochemical composition; Biomass; Culture; Nitrate; Nostoc. |
| Ano: 2016 |
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-548X2016000200003 |
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| Marques,H.L.A.; Lombardi,J.V.. |
| The objective of this work was to verify the occurrence of compensatory growth in Malaysian prawn (Macrobrachium rosenbergii) reared in pens, after being stocked in cages under high densities during nursery phase. The experiment was carried out in 0.5 m² cages and 2-m² pens set in natural bottom pond with 2,400 m². Prawn post-larvae (PL) with an average weight of 0.026 ± 0.012 g (nursery phase) were initially stocked in 16 cages at the densities of 50, 400, 800 and 1,200 PL m-2. Sixty days later, prawns were transferred to 16 growing pens, at the density of 12 prawns m-2. Initial average weight of the prawn in this phase was the final average weight registered in the nursery phase, as follows: 50 PL m-2 = 2.3 ± 0.3 g; 400 PL m-2 = 0.5 ± 0.03 g; 800 PL m-2... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biomass; Freshwater prawn; Growing; Macrobrachium rosenbergii; Pens; Survival. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982011000400001 |
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| Weigert,Gabriela Rosalee; Gurski,Erico; Benedito,Raphael Augusto de Souza. |
| Abstract With the insertion of distributed generation in distribution networks, security analysis becomes crucial, in islanded operation or when the system is connected to the grid. Dynamic stability analyses are necessary in order to achieve minimum levels of security and reliability. Such analyses are obtained through the solution of the algebraic-differential set of equations that model the distribution grid and their generators, which requires numerical solution methods. Therefore, this paper presents a computational tool for transient stability and large disturbance frequency stability analysis, considering distribution systems with the insertion of biomass-fed distributed generation, which may, or may not, have speed regulation systems. The presented... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Distributed generation; Biomass; Dynamic stability; Speed regulator; Islanded operation. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132019000200209 |
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| Detomini, Euro Roberto; USP; Massignan, Luiz Fernando Druzina; USP; Libardi, Paulo Leonel; USP; Dourado Neto, Durval; USP. |
| O objetivo deste trabalho é caracterizar o consumo hídrico do genótipo DKB 390 em condições adequadas de irrigação, tanto para situações de suprimento suficiente quanto para subótimo de nitrogênio. Valores de coeficiente de cultura são também apresentados para diferentes fases, para o primeiro caso, no intuito de prover subsídios teóricos para orçamento de água à cultura e para o manejo da irrigação durante o ciclo. Um experimento de campo foi conduzido durante a estação principal de cultivo, avaliando-se biomassa, área foliar, umidade do solo, dados climatológicos e transmitância de luz, permitindo derivar o balanço hídrico, o consumo hídrico e a eficiência de uso da água. O genótipo mencionado requer por volta de 600 mm para a obtenção de elevadas... |
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Palavras-chave: 5.01.00.00-9 Agronomia Zea mays; Evapotranspiração; Nitrogênio; Biomassa; KC; Milho Zea mays; Evapotranspiration; Nitrogen; Biomass; Kc; Maize. |
| Ano: 2009 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/379 |
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| Delgado Martínez, Rafael. |
| El objetivo de estudio fue determinar si la siembra asociada de frijol, así como las prácticas de manejo limita el crecimiento y rendimiento de frijol. El experimento fue conducido en Montecillo, México, bajo condiciones de temporal, durante los ciclos primavera verano del 2010 y 2011. Se evaluó el rendimiento de ejote y rendimiento de grano (RG) y componentes de frijol, así como rendimiento de grano (RG) y sus componentes en maíz, así mismo se anotaron los días a ocurrencia de las etapas fenológicas del frijol y maíz. Por otra parte, se registraron los índices ambientales y se estimó la eficiencia en el uso del agua radiación y uso de la tierra en ambas especies. Los resultados indican que los días a ocurrencia a las etapas fenológicas en frijol y maíz,... |
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Palavras-chave: Phaseolus vulgaris L.; Zea mays L.; Fenología; Biomasa; Phenology; Biomass; Botánica; Doctorado. |
| Ano: 2013 |
URL: http://hdl.handle.net/10521/2181 |
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| BALBINOT JUNIOR, A. A.; FERREIRA, A. S.; WERNER, F.; SILVA, M. A. de A. e; ZUCARELI, C.. |
| O objetivo deste trabalho foi avaliar o crescimento de duas cultivares de soja durante o ciclo de desenvolvimento, em função da redução na densidade de semeadura, e verificar a sua relação com a produtividade. Foi conduzido um experimento de campo nas safras 2016/17 e 2017/18, em Londrina, PR. O delineamento experimental foi de blocos completos casualizados, com cinco repetições e esquema fatorial 2 x 5. O primeiro fator se consistiu de duas cultivares de soja, BRS 1010IPRO e NS 5959IPRO e o segundo por cinco densidades de semeadura: 100, 80, 60, 40 e 20% da quantidade de sementes indicada pelo obtentor das cultivares. Em geral, não houve diferenças expressivas de biomassa acumulada durante o ciclo de desenvolvimento entre as densidades de 100, 80 e 60% do... |
| Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E) |
Palavras-chave: Soja; Densidade de Semeadura; Pratica Cultural; Biomassa; Soybeans; Biomass; Biomass production. |
| Ano: 2018 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1099933 |
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| BEHLING,ALEXANDRE; PÉLLICO NETTO,SYLVIO; SANQUETTA,CARLOS ROBERTO; CORTE,ANA PAULA D.; AFFLECK,DAVID L.R.; RODRIGUES,AURÉLIO L.; BEHLING,MARCOS. |
| ABSTRACT It is presented the theme additivity of biomass of tree components. To evaluate and discuss this context, experimental information collected in forests of Acacia mearnsii De Wild. was used. Equations for components (stem and crown) and total biomass were fitted by means of two procedures: 1) generalized nonlinear least squares and 2) weighted-nonlinear seemingly unrelated regressions. Analyzing the performance of the estimators, it can be concluded that the two tested procedures are equivalent. On the other hand, this conclusion differs when evaluated the consistency and efficiency of the estimators. Fitting equations for the components and for the total biomass by an independent way is not realistic, because from a biological point of view the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biomass; Biological consistency; Non-linear regression; System of equations. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000401759 |
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| Registros recuperados: 473 | |
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