|
|
|
| Registros recuperados: 127 | |
|
| |
|
|
| Conroy, Michael J; USGS Cooperative Fish and Wildlife Research Unit; conroy@forestry.uga.edu; Allen, Craig; University of Nebraska; allencr@unl.edu; Peterson, James T; USGS Cooperative Fish and Wildlife Research Unit;; Pritchard, Lowell, Jr.; Emory University; lpritc2@emory.edu; Moore, Clinton T; ;. |
| The southern Piedmont of the southeastern United States epitomizes the complex and seemingly intractable problems and hard decisions that result from uncontrolled urban and suburban sprawl. Here we consider three recurrent themes in complicated problems involving complex systems: (1) scale dependencies and cross-scale, often nonlinear relationships; (2) resilience, in particular the potential for complex systems to move to alternate stable states with decreased ecological and/or economic value; and (3) uncertainty in the ability to understand and predict outcomes, perhaps particularly those that occur as a result of human impacts. We consider these issues in the context of landscape-level decision making, using as an example water resources and lotic... |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Piedmont; Adaptive management; Land use; Model; Resilience; Scale; Sprawl; Uncertainty; Urbanization; Water resources. |
| Ano: 2003 |
|
| |
|
|
| Nouze, Herve; Henry, P; Noble, M; Martin, V; Pascal, G. |
| Previous studies have revealed the presence of a widespread Bottom Simulating Reflector (BSR) on the eastern Nankai slope, as well as the occurrence of enigmatic high amplitude reflections that extend well above the BSR. New high-resolution 2-D seismic data were collected on the eastern Nankai slope, during the French-Japanese SFJ cruise in year 2000 and AVA analyses of the enigmatic reflectors are conducted. At the studied location, these analyses suggest that high amplitude anomalies above the BSR delineate the top of gas hydrate rich sediments. Several tens % of the sediment porosity would be filled with gas hydrates between the BSR and a sharp boundary 30 to 60 m above. To account for these observations, we propose that an invasion by free gas of the... |
| Tipo: Text |
Palavras-chave: Zone; Model; Ridge; Methane gas; Marine sediments. |
| Ano: 2004 |
URL: http://archimer.ifremer.fr/doc/2004/publication-510.pdf |
| |
|
| |
|
|
| Mazurie, Joseph; Stanisiere, Jean-yves; Langlade, Aime; Bouget, Jean-francois; Dumas, Franck; Treguier, Cathy; Leclerc, Emilie; Ravaud, Emilie; Quinsat, Kevin; Gabellec, Raoul; Retho, Michael; Cochet, Helene; Dreano, Alain. |
| This study (“Risco”), implicating both industry, socio-economic experts and biologists, was funded by the Regional Council of Brittany, for 3 years (2010-2013), to investigate upon the origin of oysters (Crassostrea gigas) mortalities in the bay of Quiberon (South Brittany, France). Specific mortalities of adult oysters were recorded in this bay in 2006, whereas mortalities of one year old spat were observed since in 2008 in this bay as at a national scale. The experimental protocol in 2010, including a monthly survey of oyster batches at 15 experimental stations, allowed to assess the risk for one-year oysters, due to viral disease. A clear spatial distribution of this risk was evidenced, with a western area spared from contamination and mortality, and a... |
| Tipo: Text |
Palavras-chave: Baie de Quiberon; Crassostrea gigas; Mortalité; Herpès-virus; OsHV-1; Épidémiologie; Modèle.; Quiberon bay; Crassostrea gigas; Mortality; Herpes-virus; OsHV-1; Epidemiology; Model. |
| Ano: 2013 |
URL: http://archimer.ifremer.fr/doc/00179/29043/27528.pdf |
| |
|
|
| Stanisiere, Jean-yves; Mazurie, Joseph; Bouget, Jean-francois; Langlade, Aime; Gabellec, Raoul; Retho, Michael; Quinsat, Kevin; Leclerc, Emilie; Cugier, Philippe; Dussauze, Morgan; Menesguen, Alain; Dumas, Franck; Gohin, Francis; Augustin, Jean-marie; Ehrhold, Axel; Sinquin, Jean-marc; Goubert, Evelyne; Dreano, Alain. |
| The project “Risco”, supported by the “Pôle Mer” and funded by the Regional Council of Brittany, deals with specific risks of mortality of oysters, Crassostrea gigas, cultivated on the bottom, in a subtidal bay of South Brittany : the bay of Quiberon (56, France). Massive mortalities of oysters were reported in summer 2006 in this bay, exclusively located in the deep muddy area with a positive gradient eastward. A validated biogeochemical model was applied in order to simulate the dissolved oxygen over 2000-2006 : it revealed several episodes of hypoxia, more or less intense according to years, but with the same spatial distribution. This approach proved 2006 to be the most hypoxic year since 2000. The hypoxia was due to a rare conjunction of 3 factors :... |
| Tipo: Text |
Palavras-chave: Baie Quiberon; Crassostrea gigas; Huître; Mortalité; Croissance; Hypoxie; Oxygène; Modèle; Upwelling; Loire; Vilaine; Quiberon; Crassostrea gigas; Oyster; Mortality; Growth; Hypoxia; Oxygen; Model; DEB; Upwelling; Loire; Vilaine. |
| Ano: 2013 |
URL: http://archimer.ifremer.fr/doc/00180/29131/27535.pdf |
| |
|
| |
|
|
| Fialho,FB; Ledur,MC; Avila,VS. |
| A segmented polynomial model was used on several egg production curves in an attempt to analyze the differences between the curves in a more descriptive manner. Production curves from different commercial and experimental genetic lines of layers were used. The parameters of the model include the age and level of peak production, rate of decrease in production after the peak and time between start and peak of production. These and other derived variables were compared between the curves using contrasts. The methodology used allowed an easier interpretation of the curves, and the detection of differences in sexual maturity, uniformity and peak of production. This work validates the segmented polynomial model for use in future research dealing with analysis... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Egg production; Layers; Laying hens; Model. |
| Ano: 2001 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2001000300002 |
| |
|
|
| BAKO, TANKO; ENYI, OBETTA SAMUEL; IMOLEMHE, UMOGBAI VICTOR. |
| A theory using mechanical expression was proposed from the physics of oil expression in a screw press to characterize a mathematical model. The general oil expression equation was solved for three machine parameters (choke clearances, screw shaft clearances and screw shaft speeds) which simulate the machine parameters effects in the overall screw expeller process. The mathematical model was validated by the experimental data obtained from pressing fish oil with a screw press, using regression analysis. The experimental oil extraction data was fitted to the model and the quality of fit evaluated. A good fit was indicated by correlation coefficient of 0.9983, coefficient of determination of 0.9967, absolute average percentage deviation of 4.8 %, coefficient... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Mathematical; Model; Extraction; Parameters. |
| Ano: 2020 |
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/5521 |
| |
|
| |
|
|
| Pavlovic,Martin; Pavlovic,Viljem. |
| Hops (Humulus lupulus L.) ate vital fot the brewing industry, as they contribute significantly to the organoleptic qualities of beet, including taste and flavor. Experimental hop breeding data from the Slovenian Institute of Hop Research and Brewing (IHPS) were used to create a model based on the multi-attribute decision modeling methodology. The model has 18 attributes hierarchically grouped within four main attributes: Biology, Chemistry, Morphology and Brewing value. Furthermore, utility functions in the model were defined by sets of elementary decision rules throughout the entire hierarchy for all aggregated attributes. The central part of the model contains 144 decision rules, which were specified according to the model users' previous breeding... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Hop industry; Breeding; Decision-making; Model; IHPS. |
| Ano: 2011 |
URL: http://www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S1405-31952011000300007 |
| |
|
|
| Thouvenin, Benedicte; Salomon, Jean-claude. |
| In order to reproduce and investigate the marine circulation in the coastal tidal zone, and especially its three dimensional nature, it appeared interesting to develop a numerical mode! which could take account of the real bottom topography and the variations of the free surface. Navier-Stokes equations are solved in a straight forward manner, generalizing a finite difference technique already used in two-dimensional vertical models. To test the computational program, the mode! was applied to a number of flat bottom schematic basins, where we reproduced wind driven currents and tide propagation. Then we considered the particular case of a real channel and, finally, density currents associated with a salty wall. Mode) results are compared to theoretical... |
| Tipo: Text |
Palavras-chave: Modèle; Courant; Tridimensionnel; Seine; Côtier; Model; Current; Three-dimensional; Seine; Coastal. |
| Ano: 1984 |
URL: http://archimer.ifremer.fr/doc/00113/22440/20127.pdf |
| |
|
| |
|
|
| Yamamoto,K.; Matsubara,M.; Kawasaki,S.; Bari,M.L.; Kawamoto,S.. |
| Escherichia coli, as a model microorganism, was treated in phosphate-buffered saline under high hydrostatic pressure between 100 and 300 MPa, and the inactivation dynamics was investigated from the viewpoint of predictive microbiology. Inactivation data were curve fitted by typical predictive models: logistic, Gompertz and Weibull functions. Weibull function described the inactivation curve the best. Two parameters of Weibull function were calculated for each holding pressure and their dependence on holding pressure was obtained by interpolation. With the interpolated parameters, inactivation curves were simulated and compared with the experimental data sets. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Predictive microbiology; Pressure; Escherichia coli; Inactivation; Model. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2005000800014 |
| |
|
|
| Beghin, John C.; Matthey, Holger. |
| This paper presents a new partial-equilibrium, multi-market international model developed to analyze policies affecting peanut products markets. The model covers four goods (food-quality peanuts, crush-quality peanuts, peanut oil, and groundnut cake) in 13 countries/regions (Argentina, Canada, China, the EU-15, the Gambia, India, Malawi, Mexico, Nigeria, Senegal, South Africa, the United States, and Rest of World). Welfare is evaluated by looking at consumers' equivalent variation, quasi-profits in farming (peanut farming, livestock), quasi-profits in crushing, and taxpayers' revenues and outlays implied by distortions. We calibrate the model for three recent years (1999/2000, 2000/01, and 2001/02) on historical data. We illustrate the model's... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Agricultural trade policy analysis; Crush; Doha; Groundnut; Model; Oil; Peanuts; Agricultural and Food Policy; Crop Production/Industries. |
| Ano: 2003 |
URL: http://purl.umn.edu/18618 |
| |
|
|
| Casas, Stellio. |
| Monitoring coastal contamination of trace metals using bivalve molluscs as quantitative bioindicators is widely used in many international monitoring programs. The bioaccumulation of metal within an organism results from the interaction between physiological (growth, loss of weight, absorption, accumulation), chemical (metal concentration, speciation, bioavailability) and environmental factors (temperature, SPM, chlorophyll). By utilizing the parameters above in this study, it appears that modeling metal dynamics in marine mussels is a reliable tool. The model allows understanding the bioaccumulation process which results from the interactions between biological, chemical and environmental factors. One of the objective of this study was to couple a... |
| Tipo: Text |
Palavras-chave: Biomonitoring; Dynamic Energy Budget; Model; Trace metals; Bioaccumulation; Mytilus galloprovincialis; Mussel; Bioindicator; Surveillance; Budget énergétique dynamique; Modèle; Métaux traces; Bioaccumulation; Mytilus galloprovincialis; Moule; Bioindicateur. |
| Ano: 2005 |
URL: http://archimer.ifremer.fr/doc/2005/these-356.pdf |
| |
|
|
| Muller-feuga, Arnaud. |
| After a literature overview of growth models applied to intensively cultured fishes, a new one is proposed for assistance in rearing operations, with following characteristics. A simple and integratable mathematic expression simulates growth while eliminating individual weight influence. It gives way to a specific growth general definition. Temperature action mode on growth speed is simulated by substraction of two exponential functions. An automatic calculation method of thermal parameters is proposed. The torpid action of low temperatures is considered. Feeding ration influences growth through simple rules which are explicitly taken in account by mean of a two parameters function. The other growth factors, more difficult to seize, are expressed through a... |
| Tipo: Text |
Palavras-chave: Modèle; Croissance; Élevage poissons; Pisciculture; Model; Fish culture.; Growth. |
| Ano: 1990 |
URL: http://archimer.ifremer.fr/doc/00183/29428/27794.pdf |
| |
|
| |
|
|
| Neme,R; Sakomura,NK; Fialho,FB; Freitas,ER; Fukayama,EH. |
| Three trials were carried out to determine energy metabolized (EM) requirement model for starting and growing pullets from different strains, at five ambient temperatures and different percentage feather coverage. In Trial I, metabolizable energy requirements for maintenance (MEm) and efficiency of energy utilization were estimated using 64 birds of two different strains, Hy-Line W36 (HLW36) and Hy-Line Semi-heavy (HLSH), from 9 to 13 weeks of age. The effects of ambient temperature (12, 18, 24, 30 and 36ºC) and percentage feather coverage (0, 50 and 100%) on MEm were assessed in the second trial, using 48 birds per temperature per strain (HLSH and HLW36) from 9 to 13 weeks of age. Trial III evaluated ME requirements for weight gain (MEg) using 1,200 birds... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Body composition; Energy requirements; Feather coverage; Laying hens; Model; Temperature. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2005000100007 |
| |
|
|
| Lassus, Patrick; Amzil, Zouher; Baron, Regis; Sechet, Veronique; Barille, Laurent; Abadie, Eric; Bardouil, Michele; Sibat, Manoella; Truquet, Philippe; Berard, Jean-baptiste; Gueguen, Marielle. |
| In October and November 2003 a bloom of the toxic dinoflagellate Alexandrium catenella was observed in the North-east zone of Thau lagoon (French Mediterranean coast). Sea water samples were collected every hours to evaluate time-related variations of phytoplankton concentrations and to compare the relative ratio of A. catenella versus other phytoplankton species during the outbreak. From these observations, trials using recirculated sea water systems were performed to: i) evaluate the physiological effects on oyster of increasing proportions of A. catenella within a mixed microalgal diet where the non-toxic diatom Thalassiosira weissflogii was present at concentration: 1500 cells ml(-1), ii) compare the effect of two temperatures (12 degrees C and 18... |
| Tipo: Text |
Palavras-chave: Mediterranean Sea; Alexandrium catenella; Toxin content; Model; Crassostrea gigas; Paralytic shellfish poisoning. |
| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/2007/publication-2624.pdf |
| |
| Registros recuperados: 127 | |
|
|
|
