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1
Bentley, Christopher D. "The effects of dietary lipid on spawning performance and egg quality in black sea bass Centropristis striata /." Electronic version (PDF), 2007. http://dl.uncw.edu/etd/2007-3/bentleyc/christopherbentley.pdf.
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Sullivan, Katherine B. "Replacement of fish meal by alternative protein sources in diets for juvenile black sea bass." View electronic thesis, 2008. http://dl.uncw.edu/etd/2008-3/sullivank/katherinesullivan.pdf.
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Ricks, Benjamin Riddick Maceina Michael J. "The effects of tournament fishing on dispersal, population characteristics, and mortaltiy of black bass in Lake Martin, Alabama." Auburn, Ala., 2006. http://repo.lib.auburn.edu/2006%20Spring/master's/RICKS_BENJAMIN_26.pdf.
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Williamson, Craig W. "Tournament-associated mortality and the effects of culling in Wisconsin black bass (Micropterus spp.) tournaments /." Link to full text, 2007. http://epapers.uwsp.edu/thesis/2007/williamson.pdf.
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Thesis (M.S.)--University of Wisconsin--Stevens Point, 2007.Submitted in partial fulfillment of the requirements of the degree Master of Science in Natural Resources, College of Natural Resources. Includes bibliographical references (leaves 75-81).
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Burpee, Jessica L. "Scaling of mitochondrial respiration in white muscle from an active (Pomatomus saltatrix) and inactive (Centropristis striata ) fish." View electronic thesis (PDF), 2009. http://dl.uncw.edu/etd/2009-1/burpeej/jessicaburpee.pdf.
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Shepherd, Michael David Maceina Michael J. "Effects of striped bass stocking on largemouth bass and spotted bass in Lewis Smith Lake, Alabama." Auburn, Ala, 2008. http://repo.lib.auburn.edu/EtdRoot/2008/SPRING/Fisheries_and_Allied_Aquacultures/Thesis/Shepherd_Michael_41.pdf.
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Dairiki, Jony Koji. "Exigência em lisina pelo "black bass" Micropterus salmoides." Universidade de São Paulo, 2005. http://www.teses.usp.br/teses/disponiveis/11/11139/tde-19072005-144759/.
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Os elevados custos atribuídos à nutrição na piscicultura ligam a eficiência alimentar ao sucesso da atividade e à redução do impacto ao meio ambiente. Estudos sobre a nutrição e determinação de exigências nutricionais em aminoácidos são, portanto, ferramentas importantes para a consolidação da piscicultura comercial racional e com viabilidade econômica. A determinação da exigência em lisina para o black bass Micropterus salmoides foi feita em ensaio de dose-resposta e os dados coletados foram analisados por meio de três modelos estatísticos: regressão polinomial, regressão segmentada e modelagem matemática específica, para estimar a utilização e exigência dos aminoácidos. Foi utilizada a relação A/E = [(aminoácido essencial ÷ total de aminoácidos essenciais + cistina + tirosina) x 1.000], para estimar as exigências nutricionais dos demais aminoácidos essenciais em relação à lisina determinada no experimento dose-resposta. As unidades experimentais foram constituídas por lotes de 25 alevinos de black bass (1,29 ± 0,03 g; 4,35 ± 0,17 cm) condicionados a aceitar ração seca, alojados em gaiolas de PVC atóxico (abertura de malha 5 mm) com capacidade de 60 L e instaladas em caixas de polipropileno com capacidade de 1.000 L, com troca parcial de água num sistema fechado de recirculação e aeração. Os tratamentos correspondiam aos níveis crescentes de lisina: 1,0; 1,5; 2,0; 2,5; 3,0 e 3,5% na dieta n=4), num delineamento inteiramente aleatorizado (DIA). O modelo estatístico da regressão segmentada foi o modelo mais apropriado para determinação da exigência dietética de lisina para os alevinos de black bass em experimento dose-resposta. A exigência dietética em lisina para peso final, ganho de peso e taxa de crescimento específico foi de 2,1% da dieta ou 4,9% da proteína dietética. A exigência dietética de 1,69% de lisina na dieta ou 3,9% de lisina na proteína condicionou o melhor índice de conversão alimentar. O uso do perfil de aminoácidos corporais do black bass foi adequado como referência para estimar as exigências nutricionais de aminoácidos.Adequate nutrition of fish stocks interconnects fish feeding efficiency, profitability and mitigation of environmental impact of fish farming. Knowledge on amino acids requirement of farmed fish boosts rationalization and profitability of fish farming systems. This study compares estimation of amino acids requirements of largemouth bass Micropterus salmoides from data of lysine dose-response trials, analyzed through different statistical models: polynomial regression, broken-line analysis and specific mathematical modeling. Amino acids requirements were estimated through the A/E relationship [A/E = (essential amino acid ÷ total essential amino acids + cystine + tyrosine) x 1.000]. Groups of 25, feed-conditioned largemouth bass fingerlings (1.29 ± 0.03 g; 4.35 ± 0.17 cm), were stocked in 60-L cages (5 mm mesh) placed in 1,000-L plastic, indoor tanks, closed circulation system, and fed diets containing 1.0, 1.5, 2.0, 2.5, 3.0, or 3.5% lysine, in a totally randomized experimental design trial (n = 4). The broken-line analysis method yielded more reliable and precise estimations of lysine requirements 2.1% of diet or 4.9% dietetic protein for final weight, weight gain and specific growth rate. Best feed conversion ratio was attained with 1.69% lysine in the diet or 4.9% lysine in dietetic protein. Body amino acids profile was an adequate reference for estimation of largemouth bass amino acids requirements.
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Nyack, Albert C. "Scaling of post-contractile phosphocreatine recovery in white muscle of black sea bass, Centropristis striata /." Electronic version (PDF), 2006. http://dl.uncw.edu/etd/2006/nyacka/albertnyack.pdf.
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Carrier, Joseph K. "Growth survival and resistance to hypersaline stress in larval black sea bass (Centropristis striata) fed varying levels of dietary arachidonic acid (20:4n-6) /." Electronic version, 2006. http://dl.uncw.edu/etd/2006/carrierj/josephcarrier.html.
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Rezek, Troy. "The effects of dietary Docosahexaenocic acid (22:6n-3) and Arachidonic acid (20:4n-6) on growth, survival and stress resistance in black sea bass (Centropristis striata) larvae /." Electronic version (PDF), 2005. http://dl.uncw.edu/etd/2005/rezekt/troyrezek.pdf.
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Borden, William Calvin. "Phylogeography of Smallmouth Bass (Micropterus Dolomieu) and Comparative Myology of the Black Bass (Micropterus, Centrarchidae)." Cleveland State University / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=csu1209066783.
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Hunter, Ryan Wayne Maceina Michael J. "Movement, dispersal, and home ranges of tournament displaced largemouth and spotted bass in Lake Martin, Alabama." Auburn, Ala., 2006. http://repo.lib.auburn.edu/EtdRoot/2006/FALL/Fisheries_and_Allied_Aquacultures/Thesis/HUNTER_RYAN_39.pdf.
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Holst, Susanna L. "Evaluation of the capacity for compensatory growth in juvenile black sea bass (Centropristis striata) and southern flounder (Paralichthys lethostigma) /." Electronic version (PDF), 2003. http://dl.uncw.edu/etd/2003/holsts/susannaholst.html.
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White, Allison E. "Optimizing dose and mode of administration of luteinizing hormone releasing hormone analog for induced spawning of black sea bass, Centropristis striata /." Electronic version (Microsoft Word), 2004. http://dl.uncw.edu/etd/2004/whitea/allisonwhite.html.
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van, der Walt Johannes Adriaan. "Black bass (Micropterus spp.) in the Olifants- Doorn River system: distribution, distribution barries, predatory impact and management." Thesis, Cape Peninsula University of Technology, 2014. http://hdl.handle.net/20.500.11838/856.
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Thesis submitted in partial fulfilment of the requirements for the degree
Master of Technology: Nature Conservation
in the Faculty of Applied Sciences
at the Cape Peninsula University of TechnologyIn the Cape Floristic Region the Olifants- Doorn River (ODR) system is a known biodiversity hotspot in terms of endemic freshwater fish. Eight of the 10 described native freshwater fish species are endemic to this river system. One of the main threats to these fish is predation by introduced predatory fishes. Three species of alien invasive black bass (Micropterus salmoides, Micropterus dolomieu and Micropterus punctulatus) were introduced into the ODR system during the 1930s but prior to this study, their distribution and impacts had never been quantified on a system-wide basis. This study aimed to clarify the current distribution, distribution barriers, predatory impact and best management options for black bass in the ODR system. This was achieved by conducting a system-wide survey of 578 km of stream covering 41 tributaries in the ODR system. Black bass presence was tracked upstream within each tributary to its uppermost distribution point where physical barriers preventing further spread were identified and described. Fish species composition, abundance and size were recorded directly above and below these barriers to quantify black bass impact on the native fish. This research demonstrated that since introduction, natural and human assisted dispersal has facilitated not only the establishment of black bass in the Olifants and Doring main streams but also facilitated the invasions into 22 tributaries. Based on survey results it was estimated that 81.5 % of the ODR system that was previously occupied by native cyprinids is now invaded by black bass. Assessments of native fish abundance and size distribution above and below black bass invasion barriers demonstrated that in invaded tributaries only adults of larger cyprinids (Labeo seeberi, Labeobarbus capensis and Barbus serra) were able to co-occur with black bass species. Smaller fish such as juvenile L. seeberi, L. capensis and B. serra and native minnows (Barbus calidus, Pseudobarbus phlegethon and Barbus anoplus) were absent from the black bass invaded reaches. The findings of this catchment scale study are consistent with findings from other studies in the region. As a result, most native fishes are now restricted to streams above the natural barriers that limit the upstream invasions of black bass. Black bass eradication from invaded reaches is therefore necessary for habitat restoration. Effective eradication will however depend on the presence of barriers to prevent re-invasion from downstream sources. To better understand what constitutes the nature of such barriers, this study characterised the natural barriers that inhibited black bass invasions in 17 tributaries. Natural barriers comprised of 15 waterfalls, two cascades and one chute ranging in height from 0.49 m to 3.5 m with an average vertical drop of 1.21 ± 0.67 m. These findings suggest that black bass have poor jumping abilities and the recommended height of artificial barriers as part of a black bass management program should be between 80 and 100 cm depending on the size of the tributary. As a result, the presence of natural barriers or the construction of artificial barriers to prevent black bass invasions is considered a vital component of native fish conservation projects. Finally, the study assessed the feasibility of black bass eradication from the 22 invaded tributaries in the ODR system based on eight criterion covering aspects of biological, physical, anthropogenic and logistical importance. This assessment showed that effective eradication was most likely only feasible in seven tributaries. Prioritisation of these seven tributaries for black bass eradication based on the threatened status of the resident native species, the land-use in the respective catchments and the tributary length available for rehabilitation indicate that the Breekkrans, Biedouw and Thee Rivers should receive the highest priority.
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Fuller, Belinda. "Molecular systematics of selected members of the black basses, genus Micropterus, with concentration on the spotted bass (M. punctulatus) species complex." View online, 1998. http://ecommons.txstate.edu/biolfacp/10/.
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Thesis (Ph. D.)--Louisiana State University, Baton Rouge, 1998.Submitted to the graduate faculty of the Louisiana State University and Agriculture and Mechanical College in partial fulfillment of the requirements for the degree of Doctor of Philosophy in The School of Forestry, Wildlife, and Fisheries.
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Kokel, Ron W. "Factors related to angler compliance in a black bass fishery, James River, Virginia." Thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-11012008-063222/.
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Springer, Craig La Rue 1963. "Temporal variation in habitat use by smallmouth bass in the Black River, Arizona." Thesis, The University of Arizona, 1993. http://hdl.handle.net/10150/192080.
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I found significant differences in the use of substrate and cover use by smallmouth bass over 24-hour periods. Juvenile and adult fish used cobble during crepuscular periods and boulders during nocturnal periods. Cover was used less frequently by juvenile and adult fish during crepuscular periods and more frequently by adults during nocturnal periods. I found significant diel and seasonal differences in depth and velocity use by smallmouth bass. Fish typically used faster water during the crepuscular period and slower water during the nocturnal period. In general, fish used shallower and slower water during the fall than the summer. Differential uses of habitats over the diel period may be indicative of predator avoidance strategies or prey availability. Changes in potential habitat area were insignificant within the flow variation tested by PHABSIM. Habitat area available increased with a decreased flow for early life stages and nocturnal habitats.
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Scott, Mark C. "Comparative resource use by two species of black bass in riverine and impounded sections of the New River, Virginia." Thesis, This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-01242009-063022/.
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Sabo, Matthew J. "Microhabitat use and its effect on growth of age-0 smallmouth bass in the North Anna River, Virginia." Diss., Virginia Tech, 1993. http://hdl.handle.net/10919/38640.
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Wilde, James D. "Analysis of a niche market for farm-raised black sea bass Centropristis striata in North Carolina." View electronic thesis, 2008. http://dl.uncw.edu/etd/2008-3/wildej/jameswilde.pdf.
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Brown, Benjamin J. Daniels William H. "Evaluation of three fish species for culture using low salinity groundwater in the Black Belt region of Alabama." Auburn, Ala., 2007. http://repo.lib.auburn.edu/2007%20Fall%20Theses/Brown_Benjamin_56.pdf.
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Oliveira, Ana Maria Barretto de Menezes Sampaio de. "Substituição de fontes protéicas de origem animal por fontes protéicas de origem vegetal em rações para o "Black Bass" Micropterus salmoides." Universidade de São Paulo, 2003. http://www.teses.usp.br/teses/disponiveis/11/11139/tde-25092003-082811/.
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A produção comercial de peixes carnívoros exige o uso de um conjunto complexo de práticas de manejo da produção e alimentação, à redução do impacto ambiental dos alimentos e à minimização do emprego de fontes protéicas de origem animal nas formulações das dietas. O objetivo do presente estudo foi investigar o uso de atrativos alimentares em dietas formuladas exclusivamente à base de proteína de origem vegetal (PV), e seus efeitos no desempenho, composição corporal e digestibilidade das dietas pelo carnívoro black bass, Micropterus salmoides, condicionados a aceitar ração seca. Novecentos juvenis (26,54 ± 1,53 g) foram estocados em 60 aquários de polietileno de 90 L (15 peixes/aquário), em delineamento experimental totalmente ao acaso (n=3), e alimentados ad libitum em duas refeições diárias (07h00m e 17h00m), durante 13 dias, com uma dieta basal (100% PV) contendo seis níveis de proteína solúvel de peixe PSP (0,5, 1,0, 1,5, 2,0, 2,5 e 3,0%); Fisharom ® FA (0,02, 0,04, 0,06, 0,08, 0,10 e 0,12%); silagem de peixe SP (1,0, 2,0, 3,0, 4,0, 5,0 e 6,0%); um controle positivo (10% de farinha de peixe) e um controle negativo (dieta basal sem atrativos). Os peixes alimentados com a dieta contendo FA 0,02% apresentaram melhor taxa de crescimento, ganho de peso e conversão alimentar, mas não apresentaram diferenças dos demais tratamentos (P>0,05). Os peixes alimentados com dietas contendo SP como atrativo apresentaram os piores resultados de desempenho. Em uma segunda etapa, foi avaliado o desempenho e a composição corporal de 560 juvenis (3,06 ± 0,20 g) estocados em gaiolas de 60 L, dentro de caixas de polietileno de 1.000 L, instaladas em laboratório com um sistema fechado de recirculação de água com temperatura (27 o C ± 1,07 o C) e fotoperíodo (14L:10E) controlados, em um delineamento experimental totalmente ao acaso (n=4), e alimentados ad libitum em duas refeições diárias (07h00m e 17h00m), durante 43 dias, com 7 dietas isonitrogenadas (40% de PB) e isocalóricas (3.500 kcal/kg), contendo níveis decrescentes de proteína de origem vegetal: 100PV:00PA; 100PV + 0,02% Fisharon ® ; 80PV:20PA; 60PV:40PA; 40PV:60PA; 50PV:50PA (sem farinha de peixe); e uma dieta controle (ração comercial). A inclusão de farinha de peixe e farinha de penas foi limitada em 7%; a inclusão de farinha de vísceras e farinha de carne em 15%. DL-metionina (98%) e L-lisina (80%) foram adicionadas automaticamente através de matriz de aplicativo de formulação de ração. Em uma terceira etapa, foi avaliada a digestibilidade das rações utilizadas no experimento anterior. Para tanto, 1.960 juvenis (14,0 ± 1,0 cm) foram confinados em gaiolas de polipropileno e alimentados durante 40 dias, no período diurno, com as sete dietas do experimento anterior acrescidas de 0,5% de óxido de cromio. No período noturno as gaiolas eram transferidas para aquários cilíndrico-cônicos de 200 L, onde as fezes eram coletadas por sedimentação em recipiente refrigerado. O farelo de soja pode ser utilizado como substituto parcial de fontes protéicas e origem animal em rações formuladas para o black bass; a farinha de vísceras pode ser considerada uma boa opção como fonte protéica de origem animal em rações. Os melhores resultados de desempenho foram relacionados aos tratamentos controle e 50PV:50PA. A necessidade do uso da farinha de peixe na formulação de dietas para espécies carnívoras é no mínimo questionável e a determinação da digestibilidade das rações, visando maior precisão em formulações de custo mínimo para peixes carnívoros, deve ser prática corrente na indústria da alimentação de peixes.Commercial farming of carnivorous fish demands the use of a complex group of practices of production and feeding management, the reduction of the environmental impact of the feeds and the minimization of the use of animal protein sources in the diets. The present study investigated the use of feed stimulants in diets formulated exclusively out of plant protein, and their effects in growth performance, body composition and digestibility of the feeds for the carnivore largemouth bass, Micropterus salmoides, conditioned to accept dry feed. Nine hundred juvenile largemouth bass (26.54 ± 1.53 g) were stocked in 60, 90-L polyethylene aquaria (15 fish/aquarium), in a totally randomized experimental design (n=3). Fish were fed ad libitum two daily meals (0700 and 1700), for 13 days, with a basal diet (100% plant protein) containing increasing levels of fish soluble protein FSP (0.5, 1.0, 1.5, 2.0, 2.5, and 3.0%); Fisharom TM FA (0.02, 0.04, 0.06, 0.08, 0.10 and 0.12%); fish silage FS (1.0, 2.0, 3.0, 4.0, 5.0 and 6.0%); a positive control (10% of fish meal) and a negative control (basal diet without stimulants). Fish fed the diet containing 0.02%FA presented better growth rate, weight gain and feed conversion rate, but did not differ from the other treatments (P>0,05). Fish fed diets containing FS as stimulant presented the poorest performance. Next, the effect of different levels of dietary plant protein in the performance and body composition of the species was evaluated. Five hundred and sixty juvenile largemouth bass (3.06 ± 0.20 g) were stocked in 60-L cages, inside 1,000-L polyethylene tanks, installed at a laboratory with closed water-recirculating system and controled temperature (27 o C ± 1.07 o C) and photoperiod (14L:10D). Fish were fed ad libitum two daily meals (0700 and 1700), for 43 days, with 7 isonitrogenous (40% of PB) and isoenergetic (3,500 kcal/kg) diets, containing decreasing levels of plant protein: 100PP:00AP; 100PP + 0.02% Fisharom®; 80PP:20AP; 60PP:40AP; 40PP:60AP; 50PP:50AP (without fish meal); and a control diet (commercial feed). Inclusion of fish meal and feathers meal was limited to 7%; the inclusion of poultry by-product meal and meat and bone meal to 15%. DL methionine (98%) and L-lysine (80%) were added automatically through feed formulation software matrix. Trial was set up in a totally randomized experimental design (n=4). Finally, digestibility of the diets used in the experiment 2 was studied. One thousand, nine hundred and eighty juvenile largemouth bass (14.0 ± 1.0 cm) conditioned to accept artificial, dry feed were confined in polypropilene cages and fed, for 40 days, in day time, with the seven experimental diets added of 0.5% of cromic oxide. In the night, cages were transferred to cylindrical-conical bottomed, 200-L aquaria, where feces were collected by sedimentation into refrigerated containers. Data were submitted to the ANOVA and Tukeys test of comparison of means through statistical software package SAS (P=0.05). Soybean meal can be used as partial substitute of animal protein in diets for largemouth bass; the poultry by-product meal shows as a good option as animal protein source in these rations. Best performances were related to the control treatments and 50PP:50AP; the need for the use of fishmeal in the formulation of diets for carnivorous species is, at least, questionable. Results of the digestibility trials demonstrated the importance of determining the digestibility of the rations, if precision in the formulation of least-cost feeds for carnivorous fish is the ultimate goal.
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Petit, Géraldine. "Comportement, croissance et sécrétion hypophysaire de l'hormone de croissance chez le black-bass Micropterus salmoi͏̈des en alternance jour / nuit ou en lumière continue." Saint-Etienne, 2001. http://www.theses.fr/2001STET4018.
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Cette étude menée en laboratoire porte sur les activités comportementales (déplacement, prise alimentaire et agressivité), la croissance pondérale et la sécrétion hypophysaire de l'hormone de croissance (GH) chez le black-bass Micropterus salmoides. Dans une 1ère partie, l'étude comportementale souligne le caractère fortement diurne des activités de déplacement et de prise alimentaire du black-bass et l'importance de l'éclairement sur ses activités. Le cycle LD constitue le synchroniseur principal et l'éclairement permanent entraîne une profonde perturbation du rythme ainsi qu'une augmentation de l'activité. L'étude comportementale montre ensuite une relation entre le comportement agressif du black-bass et le nombre d'individus introduit dans l'aquarium : des modèles agonistiques d' " attaque " et d' " approche " diminuent de façon linéaire avec le nombre de congénères dans un groupe. La 2eme partie de l'exposé est consacrée à l'étude de la croissance pondérale et de la quantité de GH au sein de l'hypophyse en fonction de 2 conditions d'éclairement : l'alternance jour/nuit (LD12 :12) et la lumière continue (LL). L'étude de croissance montre tout d'abord une augmentation significative de l'appétit et du taux de croissance spécifique en LL. La quantification de la GH, basée sur des techniques d'immunohistochimie et d'analyse d'images, met en évidence des différences dans les profils nycthéméraux de la GH hypophysaire en fonction du régime lumineux. En LD, la quantité de GH présente des fluctuations nycthémérales significatives avec un pic en fin de scotophase alors qu'en LL, aucune variation en fonction de l'horaire de prélèvement n'est déceléeThis study conducted in laboratory deals with behavioural activities (locomotion, food intake and agressivity), growth and pituitary growth hormone (GH) secretion in Largemouth bass Micropterus salmoides. In the first part, the behavioural study stresses on the strongly diurnal pattern of locomotion and food intake activities. We also point out the importance of the light regimen on these activities. . . [etc. ]
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Augustin, Jeannie. "Approche socio-historique du monde afro-équatorien dans Juyungo de Adalberto Ortiz et Cuando los guayacanes florecian de Nelson Estupinan Bass." Thesis, Antilles, 2020. http://www.theses.fr/2020ANTI0515.
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Le «grupo de Guayaquil» dénonçait l’exploitation des Indiens, et Ortiz révéla les Noirs dans Juyungo (1943).Les personnages évoluent à Esmeraldas, sa province. Bien que les sachant victimes de racisme, il prônait la lutte des classes pour améliorer leur sort : « Más que la raza la clase ». La société équatorienne peina à abandonner le féodalisme, et la pyramide sociale reste ethnocratique. Il passerait du négrisme à une écriture empreinte d’hispanité. L’Esméraldien Estupiñán Bass, de la même « generación de los 30 », offrit Cuando los guayacanes florecían ; l’action se déroule de 1913 à 1916. Il resta, lui, la voix des Noirs. Qualifiés d’auteurs du monde noir, ces « mulâtres » s’inspirent pour ces romans, d’un art d’être, de lutter et de vivre des Noirs de la Côte. Pour le groupe de Guayaquil, les Afrodescendants exclus de tout méritaient un hommage, et le réalisme social dénoncerait cette injustice en décrivant ce qui peut apparaître comme une spécificité nègre reflétée, selon eux, dans la personnalité des personnages, leur rapport au milieu naturel ou surnaturel, les faits historiques. Comment Ortiz et Bass abordent-ils la question du progrès social des Noirs, héritiers d’une société coloniale agonisante mais accrochée aux vieux privilèges liés à l’origine ethnique ? Bass tente de montrer comment des Noirs se sacrifièrent pour Concha en 1913 à travers ses personnages. Plus tard, ceux de Juyungo, parfois indigents, malades, victimes d’un racisme tenace, d’un mépris de soi parfois inconscient, incarnent le conflit politique et surtout « racial » qui, dans la réalité sociale du pays, opposa Noirs et conservateurs dans une offensive contre l’exclusion, la négation de leurs différencesThe “grupo de Guayaquil” denounced the exploitation of the Indians, and Ortiz revealed the blacks in Juyungo (1943). The characters evolve in Esmeraldas, his province. Although he knew they were victims of racism, he advocated the class struggle to improve their lot: “Más que la raza la clase”. Ecuadorian society found it difficult to abandon feudalism, and the social pyramid remained ethnocratic. Ortiz would move from Negrism to a writing imbued with Hispanic. Estupiñán Bass, from the same “generación de los 30”, native of Esmeraldas too, offered When the Guayacans Were in Bloom; the action takes place from 1913 to 1916. He remained the voice of black people. Qualified as authors of the black world, these “mulattos” are inspired, for these novels, by an art of being, fighting and living of the Blacks of the Coast. For the group of Guayaquil, the Afrodescendants excluded from everything deserved a tribute, and social realism would denounce this injustice by describing what can appear as a Negro specificity reflected, according to them, in the personality of the characters, their relationship to the natural or supernatural environment, historical facts. How do Ortiz and Bass approach the question of the social progress of the Blacks, heirs of a dying colonial society but clinging to the old privileges linked to the ethnic origin? Bass attempts to show how black people sacrificed themselves for Concha in 1913 through her characters. Later, those of Juyungo, sometimes destitute, sick, victims of tenacious racism, of sometimes unconscious self-contempt, embody the political and especially “racial” conflict which, in the social reality of the country, opposed blacks and conservatives in an offensive against exclusion, the negation of their differences
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Leal, Beatriz Malheiros. "The use of radial basis functions in the numerical solution of option pricing problems." Master's thesis, Instituto Superior de Economia e Gestão, 2018. http://hdl.handle.net/10400.5/16010.
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Mestrado em Mathematical FinanceEsta dissertação tem como objetivo a implementação de uma abordagem numérica moderna à solução da equação diferencial parcial de Black-Scholes, usada para calcular o preço de opções financeiras usando um método sem grelha baseado em funções de base radial. Estas equações são normalmente resolvidas através de métodos numéricos tradicionais tal como o método das diferenças finitas, elementos finitos ou volumes finitos. Mais ainda, o cálculo do preço de opções pode ser feito através de modelos binomiais e/ou simulação de Monte Carlo. A interpolação de pontos utilizando funções de base radial (RBPI) é muito útil quando o número de derivados financeiros é elevado, por exemplo no caso das "basket options" cujo lucro depende do valor de um conjunto de derivados (portefólio). Este método permite concentrar os graus de liberdade do problema nas regiões do domínio mais relevantes, distribuindo os esforços computacionais. Esta dissertação apresenta a implementação do RBPI em vários problemas teste e uma análise de convergência dos problemas relativamente à sua solução exata bem como os respetivos tempos computacionais. Foi possível concluir que o método é válido e que os resultados obtidos são consistentes. No futuro, consideraremos problemas de maior dimensão bem como outras implementações deste método.
This dissertation aims at implementing a modern numerical approach to the solution of the Black-Scholes partial differential equation, used for pricing financial options, by using a meshfree method based on radial basis functions. These equations are normally solved by standard numerical methods like finite differences, finite elements or finite volumes. Additionally, option pricing can also be performed using binomial models and/or Monte Carlo Simulation. Radial Basis Point Interpolation (RBPI) is very useful when the number of derivatives is high, for example in basket options where the pay-off depends on the value of a portfolio (or basket) of derivatives. This method allows to concentrate the degrees of freedom on the most relevant regions in the domain, distributing the computational efforts. This dissertation presents the implementation of the radial basis point interpolation in several test problems and an analysis of the convergence of the discrete problems to the exact solutions, including computational times. We conclude that the method is valid and the obtained results are consistent. In the future, we will consider problems in higher dimensions as well as parallel implementations of this method.
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Čanda, Valér. "Scalable symmetric block ciphers based on group bases." [S.l.] : [s.n.], 2001. http://deposit.ddb.de/cgi-bin/dokserv?idn=962789755.
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Stephanson, Matthew B. "An Adaptive, Black-Box Model Order Reduction Algorithm Using Radial Basis Functions." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1345226428.
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Webster, Ben. "Olfactory basis of host-recognition in the black bean aphid, Aphis fabae." Thesis, Imperial College London, 2009. http://hdl.handle.net/10044/1/5272.
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Behavioural and electrophysiological responses of winged virginoparous Aphis fabae to volatile compounds of faba bean, Vicia faba, were studied and semiochemicals used in host location identified. In olfactometer bioassays, aphids responded positively to V. faba volatiles from an intact plant. This response also occurred when volatiles from an air entrainment sample of a V. faba plant were tested. Coupled gas chromatography-electroantennography revealed the presence of 16 electrophysiologically active volatile compounds in the air entrainment sample and 15 of these were identified as (E)-2-hexenal, (Z)-3-hexen-1-ol, 1-hexanol, benzaldehyde, 6-methyl-5-hepten-2-one, octanal, (Z)-3-hexen-1-yl acetate, (R)-linalool, methyl salicylate, decanal, undecanal, (E)-caryophyllene, (E)-β-farnesene, (S)-germacrene D, and (E,E,)-4,8,12-trimethyl-1,3,7,11-tridecatetraene. A synthetic blend consisting of all identified compounds in the same concentration and ratio as in the air entrainment sample elicited a similar behavioural response from the aphids as the air entrainment sample. Each compound was tested for behavioural activity individually at the same concentration as in the air entrainment sample and subsequently over a range of different doses. It was found that the response to the complete blend was not due to a response to a single compound. Dose response experiments also revealed ten of the compounds elicited negative behavioural responses from aphids. Further behavioural experiments revealed that these responses were context-specific and behavioural activity of individual compounds was different when they were presented alongside other compounds in the blend. It was hypothesised that a blend of host volatiles in a species-specific ratio may be used by A. fabae to recognise its host. To determine whether or not ratios of volatiles could provide a reliable cue to host seeking aphids, intra-specific and diurnal variation of ratios of volatiles emitted were investigated. Although considerable variation in ratios was observed the quantities of some pairs of compounds were positively correlated, indicating a degree of consistency in the ratios.
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Poeiras, Ana Patrícia Cebola. "Desenvolvimento de protótipos para pavimento e revestimento de parede em interiores com base em cortiça." Master's thesis, ISA/UL, 2015. http://hdl.handle.net/10400.5/9245.
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Mestrado em Engenharia Florestal e dos Recursos Naturais - Ramo Engenharia dos Produtos Florestais - Instituto Superior de AgronomiaThe objective of this work is to find products for wall covering and flooring that can contribute to a greater valorization of the raw materials used - wood of Eucalyptus maculata, Eucalyptus botryoides and Quercus faginea, and black expanded cork agglomerate and regranulate – by developing greener and more value-added products for indoor use. Prototypes for flooring and wall covering were assembled. The prototypes for flooring had three layers: the previously mentioned woods and black cork agglomerate (top layer), pine wood (middle layer) and Rubbercork (bottom layer). The prototypes for wall coverings were based on the expanded cork regranulate and glue, adding barks or shavings of E. maculata, E. botryoides or Q. faginea. Physical and mechanical tests were made to measure hardness and swelling for the floor prototypes, concluding that the prototype with E. maculata has a higher hardness (41 N.mm-2) and lower swelling, and therefore an improved performance. For wall covering products physical and mechanical testes were made to determine hardness, strength and thermal conductivity. The prototypes made with bark chips had the highest density 316 kg.m-3), hardness (2,9 MPa), traction (0,19 MPa) and the highest thermal conductivity (0,044 W/m.K), and showed higher mechanical strength, in comparison to prototypes made with wood chips
Projecto WoodTech (Interreg, SUDOE)
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Miller, Ashley E. "Descriptive analysis of black walnut cultivars and relationship between consumer acceptance and descriptive analysis of black walnuts in a sugar cookie base." Thesis, Kansas State University, 2012. http://hdl.handle.net/2097/14638.
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Master of ScienceFood Science - Human Nutrition
Delores Chambers
Researchers evaluated the flavor characteristics of seven black walnut (Juglans nigra L.) cultivars: Brown Nugget, Davidson, Emma K, Football, Sparks 127, Sparrow, and Tomboy using descriptive sensory analysis. Seven trained panelists developed a lexicon for the black walnuts and scored the intensities of the samples for 22 flavor and taste attributes. Results showed that the 7 samples differed significantly (P ≤ 0.05) on 13 of the attributes. For the majority of the attributes, only Emma K differed from the rest of the cultivars by being characterized with lower scores for black walnut ID, overall nutty, nutty-grain-like, nutty-buttery, floral/fruity, oily, and overall sweet. It also was higher in acrid, burnt, fruity-dark, musty/earthy, rancid, and bitter attributes. Researchers then incorporated the black walnut cultivars into a simple cookie recipe and evaluated the samples for differences in flavor attributes using the same trained panelists. Nine of the 25 attributes differed significantly across cultivars: black walnut ID, overall nutty, nutty-buttery, brown, toasted, acrid, rancid, overall sweet, and sweet (P ≤ 0.05). Lower mean scores in black walnut ID, overall nutty, and sweet and higher mean scores in rancid and acrid characterized the Emma K cookie. A PCA biplot revealed that cookies with Football, Sparks 127, and Sparrow walnuts related with one another and the attributes nutty-woody, leavening, and piney. A consumer acceptance test for six of the cookies (Tomboy cultivar was excluded) was also performed. There were four significant clusters of consumers that differed in their acceptance of the cookie samples. Cluster 1 preferred Football, clusters 2 and 3 each showed no overall preference, and cluster 4 preferred Emma K suggesting a set of niche consumers for black walnut cookies. Results presented in this paper can assist black walnut growers in determining which cultivars to plant and harvest. By knowing which cultivars have the most desirable flavor characteristics, growers can focus time and resources on select cultivars, therefore resulting in higher quality black walnuts as products to be sold to consumers in various formats. By consciously choosing which cultivars to harvest, black walnut growers can meet market demand and increase profit.
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Williams, Marvin L. "Beyond the bars the Black church and its responsibility in prison/aftercare ministry /." Theological Research Exchange Network (TREN), 1993. http://www.tren.com.
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Schwarz, Maria. "Exploring the molecular basis of multiple herbicide resistance in black grass (Alopecurus myosuroides)." Thesis, Durham University, 2017. http://etheses.dur.ac.uk/12318/.
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Modern agriculture couples the management of invasive weed species with enhancing crop yields through the intensive use of herbicides. As a result of herbicides being the primary method of weed control in agronomic crops, herbicide resistance has evolved and there has been a vast increase in the occurrence and distribution of herbicide resistant weeds. Many of the most problematic weeds have now evolved multiple herbicide resistance (MHR), which is associated with an enhanced ability to detoxify xenobiotics, enabling the weed to survive herbicide application irrespective of the mode of action. As herbicide resistance is a major limiting factor to food security in global agriculture, effective methods for weed management are sought. This work focuses on MHR in black grass (Alopecurus myosuroides), one of the most damaging weeds of winter cereals. Previous work by Edwards et al. described that black grass populations showing MHR, exhibit an upregulation in the expression of a specific phi-class glutathione transferase (AmGSTF1), which is thought to have a direct regulatory control on metabolism. The importance of AmGSTF1 in MHR has been confirmed both genetically by transgene experiments and chemically through inhibition experiments. This offers the opportunity to develop potential herbicide synergists, which are active towards AmGSTF1 and restore herbicide control in multiple herbicide resistant black grass. Considering the rapid spread of MHR in grass weeds and the limited development of new herbicides, synergists offer an important alternative strategy in counteracting resistance in the field. Recently a new class of AmGSTF1 inhibitors, derived from flavonoids, could be identified. Initial efforts focused on the synthesis of a series of flavone analogues, mainly with structural changes of the C-ring and different substituents in the 5-position. A particular emphasis was put on increasing the aqueous solubility and other physicochemical properties of the compounds, in order to increase the bioavailability in the plant. Although the potency of the initial lead molecule could not be increased in vitro, 5,7-dimethoxy-2-(1’,3’-thiazol-2’-yl)-4H-chromen-4-one, with a significantly increased aqueous solubility, showed good results in in vivo studies in black grass and acted as a synergist to the herbicide pinoxaden. The black grass plants died, when pinoxaden (10μl of a 15 μM solution) was applied to plants, which were pre-treated with the thiazole (10 μl of a 2 mM solution), but survived the herbicide treatment, if no synergist was applied prior.
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DeWoody, Jennifer. "Evolutionary and genetic basis of morphological variation in Populus nigra (European black poplar)." Thesis, University of Southampton, 2011. https://eprints.soton.ac.uk/203957/.
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Changes in precipitation over the next century may impact the distribution of species, particularly in southern Europe, where droughts are predicted to increase in frequency. In forest trees, intraspecific variation in leaf size, branching architecture, and growth rate among populations are considered adaptive and likely related to climatic differences between sites. A previous common garden study of Populus nigra L. showed morphological variation to be highly heritable and significantly differentiated among populations, indicating phenotypic differences may be adaptive. This project studied the evolutionary processes that have contributed to the morphological differentiation observed in P. nigra. Examining scales ranging from landscape-level patterns of variation to cellular differences within developing leaves identified historic and developmental processes contributing to the phenotypic differences in this species. Both isolation by distance, where migrants do not move equally across the landscape, and isolation by adaptation, where genetically divergence varies with morphological differences, have influenced differentiation among populations of P. nigra in western Europe. These patterns broadly correspond to the recolonization routes following the most recent glacial event, indicating that historic vicariance and not just adaptive divergence influence phenotypic variation. Identification of quantitative trait loci (QTL) for insect herbivory in a common garden study of hybrid poplar indicated that leaf morphology might also be influenced by insect preference. Among individuals, differences in leaf size corresponded to variation in cell number and not cell size, indicating natural selection may have influenced the regulation of cell division. Further, variation in gene regulation across the developing leaf identified differences across the leaf lamina. Finally, simulations of demographic, genetic, and adaptive processes among populations revealed that a lack of correspondence between the optimal phenotype of colonists and the optimal phenotype and newly colonized populations significantly affects levels of phenotypic differentiation among populations. In addition, changes in phenotypic optima, as may occur due to climate change, impacted the level of genetic variance, and thus the future adaptive potential of populations. Together, these results provide insight into the evolution of phenotype in P. nigra, and contribute information for management efforts in the context of a changing climate.
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McGarry, Kenneth J. "Rule extraction and knowledge transfer from radial basis function neural networks." Thesis, University of Sunderland, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.391744.
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Nyakale, Mandla Dominic. "Cranial base flexion and skeletal jaw relationships in a sample of black South Africans." Thesis, University of Limpopo (Medunsa Campus), 2011. http://hdl.handle.net/10386/878.
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Thesis (M Dent (Orthodontics)) -- University of Limpopo, 2011Introduction: Flexion of the cranial base plays a very crucial role in the study of the craniofacial complex, particularly with the development of skeletal jaw relationships. An understanding of growth of the cranial base has come to assume great importance in orthodontics, and successful treatment of skeletal jaw malrelationships depends largely on the growth and flexion of the patients' cranial base. The aim of this study was to determine the relationship between cranial base flexion and skeletal jaw relationships in a sample of Black South Africans. Materials and method: The sample comprised of 300 pre-treatment lateral cephalograms of Black South Africans which was equally divided into Class I, Class . II and Class III skeletal jaw relationships according to the cephalometric tracing and analysis, and each class of skeletal jaw relationship had an equal number of male and female subjects. A digital cephalometric analysis software program (Orthview
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Mparadzi, Andrea. "BEE - Basis, Evolution, Evaluation - A Critical Appraisal of black economic empowerment in South Africa." Master's thesis, University of Cape Town, 2014. http://hdl.handle.net/11427/4516.
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This paper is a reflection of the evolution of Broad-Based Black Economic Empowerment (BBBEE/BEE) and an evaluation of the current state of the programme. BEE is one of the most topical subjects in current South African (SA) economic discourse. Born of a need to remedy the ravages of Apartheid, BEE has evolved, and indeed continues to evolve, into one of the most elaborate and ambitious empowerment endeavours the world over. BEE aims to integrate a broad base of previously disadvantaged persons into the mainstream economy and to redistribute control over the country's economic resources. An elaborate and comprehensive regulatory framework has been crafted to bring these aims to fruition. This paper provides an overview of this framework, and through a methodical analysis of the governing instruments, the function and legal status of each instruments is clarified and the interrelationship between them is illustrated. It is argued that while this governing structure has aided BEE progress, advancement has been marginal. This can be attributed to the various hurdles that stand to hinder the initiative. This paper further highlights challenges that are both intrinsic and extrinsic to the regulatory framework, with a particular focus on problems of : financing; the broadness of broad-based BEE; fraud and; constraints of attitude. This author concludes that BEE, as a work in progress, is a programme that holds great prospects, if only the surmountable hurdles are overcome.
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Momayyezi, Mina. "Physiological basis of variation in mesophyll conductance of black cottonwood (Populus trichocarpa Torr. & Gray)." Thesis, University of British Columbia, 2017. http://hdl.handle.net/2429/61268.
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There is dramatic provenance level variation in tree species with geographically wide ranges. For example, in Populus trichocarpa Torr. & Gray, net photosynthesis (An) and stomatal conductance (gs) both increase with latitude of origin. This thesis reports a parallel cline in mesophyll conductance (gm) and explores its physiological basis. In addition to anatomical constraints, variation in gm should depend on chloroplast positioning, transmembrane CO₂ diffusion through aquaporins (AQPs), and biochemical facilitation of the CO₂↔HCO₃− equilibrium by carbonic anhydrase (CA), but evidence for the former has been lacking. I found that gm increases with latitude across 12 genotypes, as measured by chlorophyll fluorescence, and confirmed this pattern by the isotope discrimination method in six representative genotypes. Northern genotypes had greater CA activity. An inhibitor of CA, acetazolamide, reduced CA activity, gm, gs, chloroplast CO₂ concentration and An at normal CO₂ (400 µmol mol-¹), the latter being reversible at saturating CO₂. The relationship between CA activity and gm was similar whether the variation was inherent or inhibitor-induced. I then explored the role of chloroplast positioning in relation to gm, driven by the ratio of blue (BL) to red light supplied to leaves. Repositioning was manifested by a reversible decrease in chlorophyll content index (CCI), while actual chlorophyll content remained unchanged. Although gm was found to decrease as BL increased, and more so in northern genotypes, cytochalasin D, an inhibitor of chloroplast motility, blocked the effect of BL on CCI but not gm, suggesting that BL can mediate gm independently of repositioning. High BL reduced CA activity, consistent with a possible reduction in protein-facilitated diffusion, which might also involve AQPs. I found that the AQP inhibitor mercuric chloride reduces gm more in northern genotypes than in southern genotypes, both absolutely and proportionally, but also reduces CA activity. Although greater gm in high-latitude genotypes likely reflects contributions from several components of the liquid-phase diffusion pathway, this thesis draws particular attention to a major role for CA. Because gm is an equal or greater limitation on photosynthesis than gs, these findings may help direct crop improvement efforts to promote resource use efficiencies and yield.Forestry, Faculty of
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Kapoor, Kulvir Kumar Carleton University Dissertation Information and Systems Science. "Motion compensated video compression using block truncation coding as a basis." Ottawa, 1990.
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McAninch, Scott F. "City section Vauban : innovative urban planning in the heart of the Black Forest." Virtual Press, 2003. http://liblink.bsu.edu/uhtbin/catkey/1273161.
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Freiburg is a city in the southern Black Forest with a very innovative and successful urban planning policy. The city, in cooperation with other partners, redeveloped an abandoned Cold War-era military base into an ecologically sustainable cutting-edge city section with a diverse population.This creative project will examine the processes of the successful transformation of Forum Vauban from a military base into a sustainable mixed-use district. Although such progressive initiatives and creative problem solving may not be politic feasible in every community, it is important to learn from such successful and innovate to urban problems. For my creative project, I will describe and analyze various factors, events and policies that have encouraged Vauban to develop into a successful and world-renowned sustainable city section. It is especially important for urban planners to learn from the success of Vauban as a tool for professional development; however, lay person could also greatly benefit by learning about the successful planning practices in Vauban and in the city of Freiburg, Germany. Perhaps, this would enable them to learn enough about good planning practices to make a difference in their own community.Department of Urban Planning
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Chongburee, Wachira. "Implementation of Iterative Reconstruction of Images from Multiple Bases Representations." Thesis, Virginia Tech, 1998. http://hdl.handle.net/10919/35379.
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Usually, image compression techniques that use only one transform exhibit some poor properties. For instance, the Discrete Cosine Transform (DCT) cannot efficiently represent high frequency components, resulting in blurred images. The Multiple Bases Representation (MBR) compression technique, which uses two or more transforms, is found to be superior to the single transform techniques in terms of representation efficiency. However, some bits in the MBR representation are needed to track the basis information. The MBR image quality is deteriorated by discontinuities at block boundaries, as is the standard DCT transform.
In this thesis, test images are distorted by MBR compression using a Recursive Residual Projection algorithm. This algorithm is a sub-optimal method to find the best basis vector subset for representing images based on multiple orthogonal bases. The MBR distorted images are reconstructed by the iterative method of Projection onto Convex Sets (POCS). Many constraints that form convex sets are reviewed and examined.
Due to the high distortion at the block boundaries, some constraints are introduced particularly to reduce artifacts at the boundaries. Some constraints add energy to the reconstructed images while others remove energy. Thus, the initial vectors play a key role in the performance of the POCS method for better MBR reconstruction. This thesis also determines the most appropriate initial vector for each constraint.
Finally, the composite projections associated with the sign, minimum decreasing and norm-of-slope constraints are used to improve the reconstruction of the MBR distorted images and the effect of ordering of the projections is investigated.
Master of Science
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Wang, Cong. "Evaluation of a least-squares radial basis function approximation method for solving the Black-Scholes equation for option pricing." Thesis, Uppsala universitet, Institutionen för informationsteknologi, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-183042.
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Radial basis function (RBF) approximation, is a new extremely powerful tool that is promising for high-dimensional problems, such as those arising from pricing of basket options using the Black-Scholes partial differential equation. The main problem for RBF methods have been ill-conditioning as the RBF shape parameter becomes small, corresponding to flat RBFs. This thesis employs a recently developed method called the RBF-QR method to reduce computational cost by improving the conditioning, thereby allowing for the use of a wider range of shape parameter values. Numerical experiments for the one-dimensional case are presented and a MATLAB implementation is provided. In our thesis, the RBF-QR method performs better than the RBF-Direct method for small shape parameters. Using Chebyshev points, instead of a standard uniform distribution, can increase the accuracy through clustering of the nodes towards the boundary. The least squares formulation for RBF methods is preferable to the collocation approach because it can result in smaller errors for the same number of basis functions.
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Zankl, Stephan. "Real Estate Asset Allocation auf Basis des Black-Litterman-Ansatzes : ein Modell zur gleichgewichtsorientierten Portfoliodiversifikation an zyklischen Immobilienmärkten /." kostenfrei, 2009. http://www.opus-bayern.de/uni-passau/volltexte/2009/1663/.
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Santos, Gisele Tessari. "Aplicação de um método adaptativo temporal de funções de base radial à solução da equação de Black-Scholes." Universidade Federal de Minas Gerais, 2008. http://hdl.handle.net/1843/AMCN-8AGGGY.
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A large number of financial engineering problems involve non-linear equations with non-linear or time-dependent boundary conditions. Despite available analytical solutions, many classical and modified forms of the well-known Black-Scholes (BS) equation require fast and accurate numerical solutions. This work introduces the radial basis function (RBF) method as applied to the solution of the BS equation with non-linear boundary conditions, related to path-dependent barrier options. Furthermore, the diffusional method for solving advective-diffusive equations is explored as to its effectiveness to solve BS equations. Cubic and Thin-Plate Spline (TPS) radial basis functions were employed and compared one against the other as to their effectiveness to solve barrier option problems. The numerical results, when compared against analytical solutions, allow affirming that the RBF method is very accurate and easy to be implemented. When the RBF method is applied, the diffusional method leads to the same results as those obtained from the classical formulation of Black-Scholes equation. Furthermore, a time adaptive scheme was implemented, based on available predictive and corrective algorithms associated with Bixlers (1989) time adaptive ordinary differential equation solver. The time adaptive methodology showed itself to be highly efficient, when efficiency is defined both in terms of computing speed (number of time steps required to reach solutions at a desired simulation time) and in terms of accuracy or precision. Actually, the use of adaptiveness associated to numerical truncation errors of the order of 10-7, in the case of call options, and 10-5 to 10-4 when barrier options were considered, led to excellent results. This work shows a series of graphs reflecting the dependence of the numerical error with the integration method, initial time step, underlying asset value, specified truncation error and maximum stock value for implementing boundary conditions. In the case of call option simulations, the Cubic RBF method was more efficient than the TPS one, while in the case of barrier options, both methods led to essentially equivalent results. The time adaptive technique applied to the solution of Black-Scholes equation allows considerable computer processing efficiency; indeed, the number of time steps required to reach a final desired simulation time, under a given required accuracy, can be 500 times smaller than when no adaptiveness is used; the economy is problem dependent.Muitos problemas de engenharia financeira envolvem equações não-lineares com condições de contorno não-lineares ou dependentes do tempo. Apesar de soluções analíticas disponíveis, várias formas clássicas e modificadas da conhecida equação de Black-Scholes (BS) requerem soluções numéricas rápidas e acuradas. Este trabalho introduz o método de função de base radial (FBR) aplicado à solução da equação BS com condições de contorno não- lineares relacionadas a opções de barreira dependentes da trajetória. Explora-se, também, o método difusional para solucionar equações advectivo-difusivas quanto à sua efetividade para solucionar equações BS. Utilizam-se e comparam-se, em todo o trabalho, a efetividade de funções de base radial Cúbica e Thin-Plate Spline (TPS), quando aplicadas à solução de problemas de opções de barreiras. Os resultados numéricos, quando comparados com as soluções analíticas, permitem afirmar que o método FBR é muito preciso e fácil de programar. Ao se aplicar o método FBR, o método difusional leva aos mesmos resultados que aqueles obtidos pelo uso da formulação clássica da equação de Black-Scholes. Adicionalmente, implementa-se um esquema adaptativo no tempo tendo por base algoritmos preditivos e corretivos disponíveis, associados ao método adaptativo no tempo para equações diferenciais ordinárias de Bixler (1989). Os métodos adaptativos no tempo mostraram-se eficientes quer em termos de rapidez (número de iterações necessárias para atingir o tempo final requerido de simulação) quanto em termos de acurácia ou exatidão. Na realidade, o uso de adaptatividade associada aos erros de truncamento numérico da ordem de 10-7, no caso de opções de compra, e de 10-5 e 10-4 para opções de barreira levou a excelentes resultados. O trabalho mostra uma série de curvas que refletem a dependência do erro numérico relativo de predição em função do método de integração, passo inicial de tempo, tamanho das malhas de preços de ativos, erro de truncamento especificado e valor máximo dos ativos que permite simular condições de contorno equivalente a S = . No caso de opções de compra, o método baseado na FBR Cúbica adaptativa mostrou-se mais eficiente que o baseado na FBR TPS adaptativa; enquanto no caso de opções de barreiras, ambos os métodos levaram a, essencialmente, resultados equivalentes. A técnica adaptativa no tempo aplicada à solução da equação de Black-Scholes permite economias consideráveis de tempo de execução; de fato, o número de iterações temporais requerido para atingir o tempo final de simulação desejado, sob uma dada acurácia, pode ser 500 vezes menor que quando não se usa adaptatividade; a economia depende do tipo do problema.
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Pina, Katia Oliveira. "Into the black box of Knowledge Intensive Business Services : understanding the knowledge bases, innovation and competitiveness of KIBS." Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/into-the-black-box-of-knowledge-intensive-business-services-understanding-the-knowledge-bases-innovation-and-competitiveness-of-kibs(6e9139fc-5a82-4378-88bd-5712d2aeef5b).html.
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This dissertation focuses on Knowledge Intensive Business Services (KIBS). It aims to understand what these businesses are and to examine variety among them. In seeking to understand their diversity, I focus especially on the ‘knowledge bases’ at the core of their activities. The dissertation is based on three complementary studies. The first is a systematic review of the literature on KIBS. This is based primarily on a review of 130 carefully selected, relevant articles, and focuses on three questions: how are KIBS defined? how do KIBS compete? and how do KIBS innovate? The review shows that: (i) the literature is fragmented; most research does not build substantially on previous methods or findings; and (ii) while evidently heterogeneous, most of the literature has overlooked variety among KIBS. I also highlight what still needs to be known about KIBS.The second and third papers then focus on variety among KIBS, by classifying them according to their ‘knowledge bases’. In the first of these papers, I classify KIBS according to their primary knowledge bases, following the SAS Model, which identifies three: ‘analytical knowledge’, ‘synthetic knowledge’ and ‘symbolic knowledge’. Firms in three KIBS sectors: ‘architecture and engineering consultancy’; ‘specialist design’; and ‘computer and IT services’ are classified by their primary knowledge base according to information drawn from company websites. I then relate this classification to firm behaviour with respect to innovation, finding differences by primary knowledge base in the nature of the investments firms make to innovate, and in their propensities to innovate. In the second of the papers which relates ‘knowledge bases’ to KIBS, I develop the ‘knowledge bases’ approach conceptually, methodologically and empirically. Conceptually, I identify a hitherto unrecognised knowledge base: ‘compliance knowledge’. This relates to the knowledge of, and to interpretations of, laws and regulations. This knowledge base does not fit with any of the existing SAS types. Methodologically, I extract fuller information from company websites, and develop more sophisticated approaches to measurement, which allows multiple knowledge bases to be present in any one firm. Empirically, I successfully identify ‘compliance knowledge’, alongside ‘analytical’ and ‘symbolic knowledge’. I show that these are unevenly distributed across KIBS industries, including ‘advertising and design’, ‘architecture’, ‘engineering consultancy’ and ‘market research’, but importantly there is no one-to-one mapping between knowledge bases and industries. I discuss the implications of this, including for understanding the diversification of KIBS. This dissertation therefore contributes conceptually, methodologically and empirically to both understanding variety among KIBS and to the ‘knowledge bases’ literature.
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Olofsson, Karl-Johan. "Black-box optimization of simulated light extraction efficiency from quantum dots in pyramidal gallium nitride structures." Thesis, Linköpings universitet, Matematiska institutionen, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-162235.
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Microsized hexagonal gallium nitride pyramids show promise as next generation Light Emitting Diodes (LEDs) due to certain quantum properties within the pyramids. One metric for evaluating the efficiency of a LED device is by studying its Light Extraction Efficiency (LEE). To calculate the LEE for different pyramid designs, simulations can be performed using the FDTD method. Maximizing the LEE is treated as a black-box optimization problem with an interpolation method that utilizes radial basis functions. A simple heuristic is implemented and tested for various pyramid parameters. The LEE is shown to be highly dependent on the pyramid size, the source position and the polarization. Under certain circumstances, a LEE over 17% is found above the pyramid. The results are however in some situations very sensitive to the simulation parameters, leading to results not converging properly. Establishing convergence for all simulation evaluations must be done with further care. The results imply a high LEE for the pyramids is possible, which motivates the need for further research.
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Dirany, Mohammed. "Films minces auto-organisés à base de copolymères à blocs de type PS-PLA." Thesis, Orléans, 2009. http://www.theses.fr/2009ORLE2048/document.
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Les films minces de copolymères à bloc PS-b-PLA peuvent servir de gabarits pour la fabrication de nano-objets sur une surface. Ce copolymère à bloc doit dans ce cas être organisé sous forme de cylindres de PLA orientés perpendiculairement et arrangés en hexagone dans une matrice de PS sur plusieurs micromètres. Le PLA extrait par hydrolyse conduit alors à un film mince poreux. Dans cette perspective, des films minces ont été préparés par spin-coating d’une solution d’un PS-PLA, de fraction volumique en PLA 0,35. Les analyses en AFM, MEB montrent que les films ainsi préparés présente un état métastable avec une structure nanoséparée avec des cylindres de PLA orientés perpendiculairement et arrangés en hexagone très localement. Il est nécessaire de réorganiser les films pour obtenir une organisation à longue distance. Les recuits thermiques sous vide s’avèrent peu efficace. L’exposition des films à des vapeurs de solvant (THF, acétone et chlorobenzène) entraîne la réorganisation des films. La nature du solvant, le temps d’exposition conditionnent la morphologie observée. Une étude détaillée de ces paramètres permet d’obtenir une organisation optimale pour les applications visées. Une irradiation UV permet d’immobiliser le film sur la surface rendant possible l’extraction du PLA par hydrolyse. Des films de PS à nanoporosité organisés sur plusieurs micromètres peuvent donc être produits. En parallèle, une stratégie de synthèse originale de copolymères diblocs PS-PLA fondée sur la combinaison d’ATRP et du ROP en utilisant le tribromoéthanol comme amorceur commercial a été essayé. Après purification des copolymères synthétisés sur une colonne de silice afin d’éliminer les homopolymères PLA, les différentes morphologies obtenues après dépôt par spin-coating ont été étudiées et des expositions à des vapeurs de solvants ont été réalisées afin d’améliorer l’ordre à grande échelle des films préparésBlock copolymers thin films (PS-PLA) can be used as templates to fabricate nano-objects on a surface. This block copolymer must be organized in the form of cylinders of PLA oriented perpendicularly and arranged in a hexagonal array in PS matrix over several micrometers. PLA extracted by hydrolysis leads to a porous thin film. In this perspective, thin films were prepared by spin-coating from a solution of PS-PLA, the PLA volume fraction was 0,35. Analysis by AFM, SEM showed that the films prepared after spin-coating has a metastable state with a nanoseparated structure with PLA cylinders oriented perpendicularly and arranged in hexagon very locally. It is necessary to reorganize the films to obtain a long range order. The thermal annealing have been shown to be ineffective. The exposition of films to solvent vapours (THF, acetone and chlorobenzene) improves the reorganization of block copolymers thin films. The solvent nature and exposure time determine the film morphology. With a detailed experimental study of these parameters we determine the experimental conditions to obtain thin films with cylinders of PLA oriented perpendicularly and arranged in hexagonal array over several micrometers (exposure to THF for 4H). UV irradiation immobilizes the film on the surface and therefore the extraction of PLA is possible by hydrolysis. Nanoporous polystyrene thin film organized over several micrometers can be produced. In parallel, original synthesis of PS-PLA based on the combination of ATRP and ROP using commercial dualinitiator tribromoethanol has been tried. After purification of copolymers synthesized on a silica column to remove the PLA homopolymer, the morphologies obtained after spin-coating have been studied and exposition to solvent vapours were performed to improve the film order-scale
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Freire, André da Silva. "NANOMATERIAIS ELETRÓDICOS A BASE DE CARBONO COM Ni(II)(PAN)2 PARA OXIDAÇÃO ELETROQUÍMICA DE ETANOL EM MEIO ALCALINO." Universidade Federal do Maranhão, 2011. http://tedebc.ufma.br:8080/jspui/handle/tede/924.
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Previous issue date: 2011-09-19This work presents a comparative study of Black Pearls 2000 (BP) and Vulcan XC-72R (obtained concerning the oxidation of ethanol, the nanomaterial Ni(II)(PAN)2/(VC) presented higher values of current than the Ni(II)(PAN)2/(BP). A heat treatment study was carried out for the nanocomposite Ni(II)(PAN)2/(VC) because this material has shown the highest current densities for ethanol oxidation. This material was heat treated (500, 600 and 700 °C), characterized and tested for electrochemical oxidation of ethanol, and compared with the nanocomposite prepared at 25 °C. The heat treatment showed significant influence on properties such as morphology, particle size of both the support and the metal structure, and electrocatalytic activity. The nanocomposite treated at 500 °C showed better performance for electrocatalytic oxidation of ethanol (VC) nanomateriais, used as support for the complex Ni(II)(PAN)2. The composites synthesized were characterized by the following techniques: Transmission Electron Microscopy (TEM), X-ray diffraction and Cyclic Voltammetry. The results showed that the carbon support Vulcan XC-72R, is more porous than the Black Pearls 2000 and both have approximately, the same average particle size. Voltammetric analysis showed that the nanocomposite Ni(II)(PAN)2 presented lower separation between the anodic and cathodic peak potential (ΔEp) , for the pair Ni2+ / Ni3+, than the Ni(II)(PAN)2, however Ni(II)(PAN)2 presented less current density, for this redox couple. The electrocatalytical activity of the two nanocomposites through ethanol oxidation was evaluated by the techniques cyclic voltammetry and chronoamperometry. For the cyclic voltammetric study, Ni(II)(PAN)2/(BP) presented a maximum oxidation for the ethanol at 0.5 V while Ni(II)(PAN)2/(VC) showed a maximum oxidation at 0.6 V, in sodium hydroxide solution 1 mol L-1 with a concentration of 0.137 mol L-1 ethanol. Considering the current densities.
O presente trabalho mostra o estudo comparativo entre nanomateriais de carbono Black Pearls 2000 (BP) e Vulcan XC-72R (VC), utilizados como suporte para o complexo Ni(II)(PAN)2. Os compósitos sintetizados foram caracterizados pelas seguintes técnicas: Microscopia Eletrônica de Transmissão (MET), Difração de Raios-X (DRX) e Voltametria Cíclica (VC). Os resultados obtidos por MET mostraram que o suporte de carbono Vulcan XC-72R possui mais espaços na superfície do que o Black Pearls 2000 e ambos, têm aproximadamente, o mesmo tamanho médio de partículas. A análise voltamétrica mostrou que o nanocompósito Ni(II)(PAN)2/BP apresentou menor separação entre os potenciais de pico (ΔEp) anódico e catódico, para o par Ni2+/Ni3+, em comparação com Ni(II)(PAN)2/VC, porém com menor densidade de corrente, referente a este par redox. A atividade eletrocatalítica dos nanocompósitos para oxidação de etanol foi avaliada pelas técnicas voltametria cíclica e cronoamperometria. Na voltametria cíclica, Ni(II)(PAN)2/BP apresentou pico de oxidação para etanol em 0,5 V e Ni(II)(PAN)2/VC apresentou pico de oxidação em 0,6 V, em solução de hidróxido de sódio 1 mol L-1 com concentração de 0,137 mol L-1 de etanol. Quanto as densidades de corrente obtidas na oxidação de etanol, Ni(II)(PAN)2/VC apresentou valores maiores do que Ni(II)(PAN)2/BP. Um estudo de tratamento térmico foi realizado para o nancompósito Ni(II)(PAN)2/VC em virtude deste ter apresentado maiores densidades de corrente para oxidação de etanol. Este material tratado termicamente (a 500, 600 e 700°C) foi caracterizado e testado eletroquimicamente para oxidação de etanol, e comparado com o nanocompósito preparado a 25°C. O tratamento térmico teve influência significativa em propriedades como: morfologia, tamanho da partícula tanto do suporte quanto do metal, estrutura e atividade eletrocatalítica. O nanocompósito tratado a 500°C apresentou melhor desempenho eletrocatalítico para oxidação de etanol.
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Kensing, Vibeke. "Black-Box Model Development of the JAS 39 Gripen Fuel Tank Pressurization System : Intended for a Model-Based Diagnosis System." Thesis, Linköping University, Department of Electrical Engineering, 2002. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-1528.
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The objective with this thesis is to build a Black-Box model of the tank pressurization system in JAS 39 Gripen. This model is intended to be used in an existing diagnosis system for the security control in the tank pressurization system. The tank pressurization system is a MIMO system. This makes the identification process more complicated when the best model is to be chosen. In this master's thesis the identification procedure for a MIMO system can be followed. Testing of the diagnosis system with the created Black-Box model shows that the model seems to be good enough. The diagnosis system takes the right decisions in the performed simulations. This shows that system identification might be a good alternative to physical modelling for a real-time model. The disadvantage with the Black-Box model is that it is less accurate in steady-state than the physical model used before is. The advantage is that it is faster than the physical model. The diagnosis system and the model developed in this thesis are not directly applicable on the real system today. The model has to be redesigned on the real system, this is also the case for the diagnosis system. The diagnosis system also has to be redesigned, so general flight cases, not only the security control can be supervised. However, experiences and choices like input and output signals, and choice of sample interval can be reused from this thesis when a new model might be developed.
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Kommaraju, Mallik. "Predictor development for controlling real-time applications over the Internet." Texas A&M University, 2005. http://hdl.handle.net/1969.1/4813.
Full textAbstract:
Over the past decade there has been a growing demand for interactive multimedia
applications deployed over public IP networks. To achieve acceptable Quality of Ser-
vice (QoS) without significantly modifying the existing infrastructure, the end-to-end
applications need to optimize their behavior and adapt according to network char-
acteristics. Most existing application optimization techniques are based on reactive
strategies, i.e. reacting to occurrences of congestion. We propose the use of predic-
tive control to address the problem in an anticipatory manner. This research deals
with developing models to predict end-to-end single flow characteristics of Wide Area
Networks (WANs).
A novel signal, in the form of single flow packet accumulation, is proposed for
feedback purposes. This thesis presents a variety of effective predictors for the above
signal using Auto-Regressive (AR) models, Radial Basis Functions (RBF) and Sparse
Basis Functions (SBF). The study consists of three sections. We first develop time-
series models to predict the accumulation signal. Since encoder bit-rate is the most
logical and generic control input, a statistical analysis is conducted to analyze the
effect of input bit-rate on end-to-end delay and the accumulation signal. Finally,
models are developed using this bit-rate as an input to predict the resulting accu-
mulation signal. The predictors are evaluated based on Noise-to-Signal Ratio (NSR)
along with their accuracy with increasing accumulation levels. In time-series models, RBF gave the best NSR closely followed by AR models. Analysis based on accu-
racy with increasing accumulation levels showed AR to be better in some cases. The
study on effect of bit-rate revealed that bit-rate may not be a good control input on
all paths. Models such as Auto-Regressive with Exogenous input (ARX) and RBF
were used to develop models to predict the accumulation signal using bit-rate as a
modeling input. ARX and RBF models were found to give comparable accuracy, with
RBF being slightly better.