Consulta: subjectFacets:"Gas"
Registros recuperados: 16
Data/hora: 07/06/2024 01:48:59

GASES de efeito estufa.
Provedor de dados: 14
bitstream/item/176076/1/Gases-de-efeito-estufa.pdf
Tipo: Fôlder / Folheto / Cartilha (INFOTECA-E)
Palavras-chave: Gado; Efeito estufa; Meio ambiente; Gas; Fluido.
Ano: 2017
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1090962

Inventário Corporativo de Emissões Atmosféricas de Gases de Efeito Estufa da Embrapa Hortaliças para o ano de 2012.
Provedor de dados: 14
Autores: LIMA, C. E. P.; LIGOSKI, G. R.; GUEDES, I. M. R.; FONTENELLE, M. R.; SILVA, J. da.
O presente documento tem como objetivo apresentar o inventário de emissões atmosféricas das emissões de gases de efeito estufa da Embrapa Hortaliças para o ano de 2012. Foram quantificadas as emissões de escopo 1, exceto aquelas relacionadas aos processos agrícolas; de escopo 2 e de escopo 3, sendo estas restritas apenas às emissões decorrentes de viagens aéreas.
Tipo: Documentos (INFOTECA-E)
Palavras-chave: Embrapa Hortaliças; Efeito estufa; Gas.
Ano: 2014
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1009208

Técnica do gás traçador SF6 para medição de campo do metano ruminal em bovinos: adaptações para o Brasil.
Provedor de dados: 14
Autores: PRIMAVESI, O.; FRIGHETO, R. T. S.; PEDREIRA, M. S.; LIMA, M. A.; BERCHIELLI, T. T.; DEMARCHI, J. J. A. A.; MANELA, M. Q.; BARBOSA, P. F.; JOHNSON, K. A.; WESTBERG, H. H.
bitstream/CPPSE/15523/1/PROCIDOC39OP2004.00219.pdf
Tipo: Documentos (INFOTECA-E)
Palavras-chave: Gás metano; Técnica do gás traçador.; Gas; Metano; Bovino; Rumen; Analise; Equipamento.
Ano: 2004
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/42497

Dinâmica de gases de efeito estufa em sistemas de produção pecuária do bioma Pampa.
Provedor de dados: 14
Autores: GENRO, T. C. M.; VOLK, L. B. da S.; AMARAL, G. A. do; FARIA, B. M. de; SILVA, M. A. P. da; CARVALHO, P. C. de F.; BAYER, C.; BERNDT, A.; OLIVEIRA, P. P. A.
Gases de efeito estufa na pecuária; Como o metano se forma nos ruminantes?; A pecuária gaúcha e os gases de efeito estufa; A pesquisa em gases de efeito estufa no Brasil e no RS; Resultados preliminares.
Tipo: Artigo de divulgação na mídia (INFOTECA-E)
Palavras-chave: Gas.
Ano: 2012
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/963434

Desempenho e emissão de metano de novilhos Hereford em pastagem nativa usada em diferentes níveis de intensificação.
Provedor de dados: 14
Autores: GENRO, T. C. M.; FARIA, B. M. de; ROSSETTO, J.; CEZIMBRA, I.; SAVIAN, J.; CARVALHO, P. C. de F.; BAYER, C.; BERNDT, A.; SILVA, M. A. P. da; YOKOO, M.; CARDOS, L. L.; OLIVEIRA, P. P. A.; VOLK, L. B. da S.; AMARAL, G. A. do.
bitstream/item/110639/1/Genro-et-al.pdf
Tipo: Artigo de divulgação na mídia (INFOTECA-E)
Palavras-chave: Gado de corte; Gas.
Ano: 2013
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/998556

Space-time evolution of a large field of pockmarks in the Bay of Concarneau (NW Brittany)
Provedor de dados: 5
Autores: Baltzer, Agnes; Reynaud, Marine; Ehrhold, Axel; Fournier, Jerome; Cordier, Celine; Clouet, Helene.
About a decade ago, a large field of pockmarks, covering an overall area of 36 km(2) was discovered in water depths of &lt; 30m in the central part of the Bay of Concarneau (Southern Brittany, France). This field, composed of features from 5 m to 35 m in diameter and &lt; 1 m in depth, is characterized by unusual high densities of pockmarks, up to 5840 per square kilometre. Geophysical data correlated with sedimentary samples acquired in 2005 and 2009 show that pockmarks and their immediate surroundings are associated with dense tubes benches cover, built by a filter-feeding amphipod: Haploops nirae, forming original benthic communities. Two complementary surveys were carried out in April 2011 (Pock and Ploops) and April 2014 (Pock and Tide), on the...
Tipo: Text
Palavras-chave: Géophysique; Marée; Failles; Gaz; Geophysics; Pockmarks; Tide; Turbidity; Gas; Chimneys pipes; Concarneau.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00410/52107/52938.pdf

Analysis of light hydrocarbons in marine sediments by headspace technique: Optimization using design of experiments
Provedor de dados: 5
Autores: Donval, Jean-pierre; Charlou, Jean-luc; Lucas, L.
Headspace technique is a common method to analyze light hydrocarbons in deep marine sediments. The use of an automatic headspace sampler instead of a manual injection is the guarantee for a better repeatability and furthermore it is less time consuming. But to increase the sensitivity and therefore, to achieve a better detection limit, it is necessary to optimize the automatic headspace sampler parameters. The theory of design of experiments was applied here by studying them. As a response, methane, which is an important gas in marine sediments, was chosen for its short analysis time. Regarding the parameters for automatic headspace sampler, eight variables were selected and then, a screening of them was carried out with a fractional factorial design to...
Tipo: Text
Palavras-chave: Design of experiments; Headspace technique; Gas; Sediments.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-6235.pdf

Multiple bottom-simulating reflections in the Black Sea: Potential proxies of past climate conditions
Provedor de dados: 5
Autores: Popescu, Irina; De Batist, Marc; Lericolais, Gilles; Nouze, Herve; Poort, Jeffrey; Panin, Nicolae; Versteeg, Wim; Gillet, Herve.
A previously unknown pattern of multiple bottom-simulating reflections (BSRs) occurs on high-resolution reflection seismic data in the Danube deep-sea fan, associated with acoustic features indicating free gas. Our study provides evidence that this pattern is developed in relation with the architecture of distinct channel-levee systems of the Danube fan. Channel-levee systems hosting multiple BSRs act as relatively sealed gas-bearing systems whose top is situated above the base of the gas hydrate stability zone (BGHSZ). Inside these systems, free gas accumulates below the BGHSZ under a combined lithological, structural and stratigraphical control. The uppermost BSR marks the current equilibrium BGHSZ, for a gas composition of more than 99% methane....
Tipo: Text
Palavras-chave: Black Sea; Deep sea fan; Seismic data; Gas; Gas hydrates; Bottom simulating reflections.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-1210.pdf

The Danube submarine canyon (Black Sea): morphology and sedimentary processes
Provedor de dados: 5
Autores: Popescu, Irina; Lericolais, Gilles; Panin, Nicolae; Normand, Alain; Dinu, Cornel; Le Drezen, Eliane.
The Danube Canyon is a large shelf-indenting canyon that has developed seaward of the late Pleistocene paleo-Danube valley. Mechanisms of canyon evolution and factors that controlled it are revealed by analyzing the morphology and the sedimentary structure of the canyon, as well as the main features of the continental margin around the canyon. This is based on investigation by swath bathymetry in the canyon area combined with different types of seismic data. The canyon is a major erosional trough with a flat bottom cut by an entrenched axial thalweg. The thalweg path varies from highly meandering to fairly straight in relation to the local gradient. Segments of the canyon are characterized by specific morphology, orientation and gradient along the axial...
Tipo: Text
Palavras-chave: Gas; Wave cut terrace; Buried fluvial channels; Headward erosion; Submarine canyon; Black Sea.
Ano: 2004
URL: http://archimer.ifremer.fr/doc/2004/publication-476.pdf

Tectonic and sedimentary controls on widespread gas emissions in the Sea of Marmara: Results from systematic, shipborne multibeam echo sounder water column imaging
Provedor de dados: 5
Autores: Dupre, Stephanie; Scalabrin, Carla; Grall, Celine; Augustin, Jean-marie; Henry, Pierre; Sengor, A. M. Celal; Goeruer, Naci; Cagatay, M. Namik; Geli, Louis.
Understanding of the evolution of fluid-fault interactions during earthquake cycles is a challenge that acoustic gas emission studies can contribute. A survey of the Sea of Marmara using a shipborne, multibeam echo sounder, with water column records, provided an accurate spatial distribution of offshore seeps. Gas emissions are spatially controlled by a combination of factors, including fault and fracture networks in connection to the Main Marmara Fault system and inherited faults, the nature and thickness of sediments (e.g., occurrence of impermeable or gas-bearing sediments and landslides), and the connectivity between the seafloor and gas sources, particularly in relation to the Eocene Thrace Basin. The relationship between seepage and fault activity is...
Tipo: Text
Palavras-chave: Fluid emissions; Gas; Water column acoustics; Multibeam echo sounder; Sea of Marmara; Tectonics.
Ano: 2015
URL: http://archimer.ifremer.fr/doc/00268/37972/36049.pdf

Seistec seismic profiles: A tool to differentiate gas signatures
Provedor de dados: 5
Autores: Baltzer, Agnès; Tessier, Bernadette; Nouze, Herve; Bates, R; Moore, C; Menier, D.
The presence of gas is a common feature in many seismic sections. However, the origin of the gas is often difficult to determine. Recently acquired very high resolution seismic profiles using an IKB Seistec boomer provide useful insight to the understanding of the gas origins in a range of environmental settings including sea lochs and coastal lagoons. The gas features are described both from a qualitative point of view through their acoustic facies, and quantitatively through the associated seismic signal (polarisation, amplitude). Acoustic facies include acoustic turbidity, gas "curtains" and "blankets" as well as "white fringes" and "black shadows". All the features encountered have been related to specific gas nature generated by different sources...
Tipo: Text
Palavras-chave: Signal amplitude; Signal polarisation; Gas; Acoustic facies; Seistec profiles.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/publication-835.pdf

Analysis of hydrogen and methane in seawater by “Headspace” method: Determination at trace level with an automatic headspace sampler
Provedor de dados: 5
Autores: Donval, Jean-pierre; Guyader, Vivien.
“Headspace” technique is one of the methods for the onboard measurement of hydrogen (H2) and methane (CH4) in deep seawater. Based on the principle of an automatic headspace commercial sampler, a specific device has been developed to automatically inject gas samples from 300 ml syringes (gas phase in equilibrium with seawater). As valves, micro pump, oven and detector are independent, a gas chromatograph is not necessary allowing a reduction of the weight and dimensions of the analytical system. The different steps from seawater sampling to gas injection are described. Accuracy of the method is checked by a comparison with the “purge and trap” technique. The detection limit is estimated to 0.3 nM for hydrogen and 0.1 nM for methane which is close to the...
Tipo: Text
Palavras-chave: Gas; Seawater; Headspace method.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00354/46523/46287.pdf

Cash Ethanol Cross-Hedging Opportunities
Provedor de dados: 31
Autores: Franken,   Jason R.V.; Parcell,   Joseph L.
Increased use of alternative fuels and low commodity prices have contributed to the recent expansion of the U.S. ethanol industry.  As with any competitive industry, some level of output price risk exists in the form of volatility; yet, no actively traded ethanol futures market exists to mitigate output price risk.  This study reports estimated minimum variance cross-hedge ratios between Detroit spot cash ethanol and the New York Mercantile Exchange unleaded gasoline futures for 1-, 4-, 8-, 12-, 16-, 20-, 24-, and 28-week hedge horizons.  The research suggests that a one-to-one cross-hedge ratio is not appropriate for some horizons.
Tipo: Journal Article
Palavras-chave: Cross-hedging; Ethanol; Gas; G13; Q13; Q42.
Ano: 2003
URL: http://purl.umn.edu/43152

Strategies and facilities in order to improve animal welfare
Provedor de dados: 96
Autores: Moura,Daniella Jorge de; Bueno,Leda Globbo de Freitas; Lima,Karla Andrea Oliveira de; Carvalho,Thayla Morandi Ridolfi de; Maia,Ana Paula de Assis Maia.
To keep the position in being a world-wide exporter of chicken meat, Brazil must meet international quality standards, always seeking alternative resources of improvement, without increasing production costs, including litter quality, requirements of animal welfare and environment affairs, such as the use and reuse of broiler litter. Researches are performed in the areas of animal welfare, environment, animal behavior and use of modern climatization technology improving the quality of the environment created to raise broilers, also trying to reduce the greenhouse gas emissions and global warming in the environment, becoming a sustainable production system. This paper has a bibliographic revision of the subject mentioned above, intending to show a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Broiler; Broiler litter; Electrical energy; Environment; Gas; Welfare.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982010001300034

Evaluation of elephant grass silage with the addition of cassava scrapings
Provedor de dados: 96
Autores: Zanine,Anderson de Moura; Santos,Edson Mauro; Dórea,João Ricardo Rebouças; Dantas,Paulo Alfredo de Santana; Silva,Thiago Carvalho da; Pereira,Odilon Gomes.
The objective of this experiment was to evaluate the effects of adding cassava scrapings on gas and effluent losses, dry matter recovery, pH, contents of N-NH3, organic acids and volatile fatty acids and the bromatological composition of elephant grass silages. It was used a randomized complete design, with four levels of cassava scrapings (0, 7, 15 or 30% natural matter) each one with four replications per level. The grass was cut at 50 days of regrowth and ensiled in 15-L silos, equipped with a Bunsen valve to allow gas outflow. The gas losses decreased quadratically with the addition of cassava scrapings, whereas effluent losses decreased linearly. Dry matter recovery increased quadratically with the addition of cassava scrapings. Dry matter (DM)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Crude protein; Dry matter; Effluent; Fermentation; Gas.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982010001200008

In vitro fermentation of corn silage using rumen fluid buffered or not and different sample amounts
Provedor de dados: 65
Autores: Homem Junior,Antonio Carlos; Ezequiel,Jane Maria Bertocco; Perez,Henrique Leal; Almeida,Marco Tulio Costa; Paschoaloto,Josimari Regina; Carvalho,Vanessa Barbosa de; Cremasco,Leonardo Fernandes; Costa,Macella Borsonello da.
Methodological variations in the amount of sample incubated and the type of rumen fluid used are commonly observed. This study evaluated the effect of three sample amounts (0.6, 1.3 or 2.6g DM 100mL-1 of rumen fluid) incubated in rumen fluid buffered (BRF-buffered rumen fluid) or not (PRF-pure rumen fluid) on total gas volume (TV), methane (CH4) production, dry matter degradation (DM Deg) and final pH of corn silage incubated in vitro. The highest DM Deg was reached with the lowest amounts of sample (0.6 and 1.3g of DM 100mL-1 of rumen fluid). The sample amount of 2.6g associated with PRF reduced CH4 production (P&lt;0.05), compared with the amounts of 0.6 and 1.3g DM 100mL-1, which had similar CH4 production (P&gt;0.05). The use of BRF caused no effect on...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Degradation; Gas; Incubation; Methane; PH.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782015001202229