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The Global ETD Search service is a free service for researchers
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Showing 41 to 47 of 47 (0.042 seconds)Spelling suggestions: "subject:"bias"" "subject:"bio""
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Ecologia tr?fica de anf?bios anuros: rela??es filogen?ticas em diferentes escalasAmado, Talita Ferreira 17 April 2014 (has links)
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Previous issue date: 2014-04-17 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / Understand the origin, maintenance and the mechanisms that operate in the current biodiversity is the major goal of ecology. Species ecology can be influenced by different factors at different scales. There are three approaches about the ecological differences between species: the first brings that differences result from current processes on niche characteristics (e.g. diet, time, space); the second that species differences are explained by random patterns of speciation, extinction and dispersion, the third that historical events explain the formation and composition of species in communities. This study aims to evaluate the influence of phylogenetic relationships in determining ecological characteristics in amphibians (globally) and test with that, if ecological differences between species of frogs are the result of ancient pre-existing differences or as result of current interactions. Another objective of this study is to verify if ecological, historical or current characteristics determine the size of species geographical distribution. The diet data for analysis of trophic ecology were collected from published literature. We performed a non-parametric MANOVA to test the existence of phylogenetic effects in diet shifts on frogs history. Thus, it is expected to know the main factors that allow the coexistence of anuran species. We performed a phylogenetic regression to analyze if niche breadth, body size and evolutionary age variables determine the size of the geographical distribution of amphibians in the Amazon. In the present study, new contributions to knowledge of major ecological patterns of anurans are discussed under a phylogenetic perspective / Entender a origem, manuten??o e os mecanismos que operam na biodiversidade atual s?o um dos principais objetivos da Ecologia. A ecologia das esp?cies pode ser influenciada por diferentes fatores em diferentes escalas. Existem tr?s abordagens a cerca das diferen?as ecol?gicas entre as esp?cies: a primeira traz essas diferen?as resultam de processos atuais atuando sobre as caracter?sticas do nicho (dieta, tempo, espa?o, etc); a segunda que diverg?ncias no nicho das esp?cies s?o explicadas por padr?es rand?micos de especia??o, dispers?o e extin??o; a terceira que eventos hist?ricos explicam a forma??o e a composi??o das esp?cies nas comunidades. Este estudo tem como objetivo avaliar a influ?ncia das rela??es filogen?ticas na determina??o de caracter?sticas ecol?gicas em anf?bios (globalmente) e testar, com isso, se as diferen?as ecol?gicas entre as esp?cies de anuros s?o resultado de diferen?as antigas pr?-existentes ou como o resultado de intera??es ecol?gicas mais recentes. Outro objetivo deste estudo ? verificar que caracter?sticas ecol?gicas, hist?ricas ou atuais, determinam e influenciam o tamanho da distribui??o geogr?fica das esp?cies. Os dados de dieta para a an?lise da ecologia tr?fica dos anf?bios foram coletados a partir da literatura j? publicada. Realizamos uma MANOVA n?o param?trica para testar a exist?ncia de efeitos filogen?ticos nas principais diverg?ncias na dieta dos anuros. Com isso, espera-se conhecer os principais fatores que permitem a coexist?ncia das esp?cies de anf?bios anuros e quais os principais n?s da filogenia de anf?bios respons?veis pelas diferen?as observadas atualmente no nicho tr?fico das esp?cies. Realizamos uma regress?o filogen?tica para analisar se as vari?veis de largura de nicho, tamanho corporal e tempo de diverg?ncia determinam o tamanho da distribui??o geogr?fica dos anf?bios anuros da Amaz?nia. Neste trabalho, novas contribui??es ao conhecimento dos padr?es ecol?gicos apresentados pelos anuros s?o fornecidas e discutidas sob uma perspectiva filogen?tica
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Bios éducatifs : problèmes du biopouvoir dans les représentions littéraires et filmiques du milieu éducatif (1984-2015)Allouch, Hanen 12 1900 (has links)
No description available.
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| 43 |
OpenBSD Hardware Sensors — Environmental Monitoring and Fan ControlMurenin, Constantine Aleksandrovich 18 May 2010 (has links)
This thesis discusses the motivation, origin, history, design guidelines, API, the device drivers and userland utilities of the hardware sensors framework available in OpenBSD. The framework spans multiple utilities in the base system and the ports tree, is utilised by over 75 drivers, and is considered to be a distinctive and ready-to-use feature that sets OpenBSD apart from many other operating systems, and in its root is inseparable from the OpenBSD experience.
The present framework, however, is missing the functionality that would allow the user to interface with the fan-controlling part of the hardware monitors. We therefore discuss the topic of fan control and introduce sysctl-based interfacing with the fan-controlling capabilities of microprocessor system hardware monitors. The discussed prototype implementation reduces the noise and power-consumption characteristics in fans of personal computers, especially of those PCs that are designed from off-the-shelf components. We further argue that our prototype is easier, more intuitive and robust compared to solutions available elsewhere.
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| 44 |
OpenBSD Hardware Sensors — Environmental Monitoring and Fan ControlMurenin, Constantine Aleksandrovich 18 May 2010 (has links)
This thesis discusses the motivation, origin, history, design guidelines, API, the device drivers and userland utilities of the hardware sensors framework available in OpenBSD. The framework spans multiple utilities in the base system and the ports tree, is utilised by over 75 drivers, and is considered to be a distinctive and ready-to-use feature that sets OpenBSD apart from many other operating systems, and in its root is inseparable from the OpenBSD experience.
The present framework, however, is missing the functionality that would allow the user to interface with the fan-controlling part of the hardware monitors. We therefore discuss the topic of fan control and introduce sysctl-based interfacing with the fan-controlling capabilities of microprocessor system hardware monitors. The discussed prototype implementation reduces the noise and power-consumption characteristics in fans of personal computers, especially of those PCs that are designed from off-the-shelf components. We further argue that our prototype is easier, more intuitive and robust compared to solutions available elsewhere.
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| 45 |
Evaluating the Greenhouse Gas Mitigation Potential and Cost-competitiveness of Forest Bioenergy Systems in OntarioRalevic, Peter 09 August 2013 (has links)
Recent literature has recommended that life cycle assessments (LCA) of forest bioenergy supply chains consider the impact of biomass harvest on ecosystem carbon stocks as well as the net emissions arising from combustion of various forms of biofuels compared with reference fossil fuel systems. The present study evaluated the magnitude and temporal variation of ecosystem C stock changes resulting from harvest of roadside residues and unutilized whole trees for bioenergy. The Carbon Budget Model (CBM-CFS3) was applied to the Gordon Cosens Forest, in northeastern Ontario, along with the Biomass Opportunity Supply Model (BiOS-Map), for cost analysis of different types of biomass comminution. Natural gas (NG) steam and electricity, grid electricity, and coal electricity reference systems were analyzed for a pulp and paper mill.
The findings showed that the forested landscape becomes a net sink for carbon following the 20th year of roadside residue harvest, compared to whole-tree harvest, where the forested landscape remained a net source of carbon over the entire 100 year rotation. The cumulative ecosystem carbon loss from whole-tree harvest was 11 times greater compared to roadside residue harvest. BiOS-Map analysis suggested that due to technical and operational limits, between 55%-59% and 16%-24% of aboveground biomass was not recovered under roadside residue and whole-tree harvest respectively. The cost of delivering roadside residues was estimated at $52.32/odt–$57.45/odt, and for whole trees $92.63/odt–$97.44/odt.
The Life Cycle Assessment (LCA) analysis showed break-even points of 25, 33 and 6 years for roadside residues displacing NG steam, NG electricity, and coal, respectively. No GHG reduction was achieved when forest biomass was used to displace grid electricity that is generated in Ontario. Whole-tree bioenergy resulted in no GHG reduction for NG displacement, and a break-even point of 70-86 years for coal. A net GHG reduction of 67% and 16% was realized when roadside residues and whole trees were used to displace coal, compared to 45% and 38% when roadside residues were used to displace NG steam and NG electricity, respectively. Therefore, it is recommended that bioenergy deployment strategies focus on the utilization of roadside residues, if the main goal is GHG mitigation.
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| 46 |
Evaluating the Greenhouse Gas Mitigation Potential and Cost-competitiveness of Forest Bioenergy Systems in OntarioRalevic, Peter 09 August 2013 (has links)
Recent literature has recommended that life cycle assessments (LCA) of forest bioenergy supply chains consider the impact of biomass harvest on ecosystem carbon stocks as well as the net emissions arising from combustion of various forms of biofuels compared with reference fossil fuel systems. The present study evaluated the magnitude and temporal variation of ecosystem C stock changes resulting from harvest of roadside residues and unutilized whole trees for bioenergy. The Carbon Budget Model (CBM-CFS3) was applied to the Gordon Cosens Forest, in northeastern Ontario, along with the Biomass Opportunity Supply Model (BiOS-Map), for cost analysis of different types of biomass comminution. Natural gas (NG) steam and electricity, grid electricity, and coal electricity reference systems were analyzed for a pulp and paper mill.
The findings showed that the forested landscape becomes a net sink for carbon following the 20th year of roadside residue harvest, compared to whole-tree harvest, where the forested landscape remained a net source of carbon over the entire 100 year rotation. The cumulative ecosystem carbon loss from whole-tree harvest was 11 times greater compared to roadside residue harvest. BiOS-Map analysis suggested that due to technical and operational limits, between 55%-59% and 16%-24% of aboveground biomass was not recovered under roadside residue and whole-tree harvest respectively. The cost of delivering roadside residues was estimated at $52.32/odt–$57.45/odt, and for whole trees $92.63/odt–$97.44/odt.
The Life Cycle Assessment (LCA) analysis showed break-even points of 25, 33 and 6 years for roadside residues displacing NG steam, NG electricity, and coal, respectively. No GHG reduction was achieved when forest biomass was used to displace grid electricity that is generated in Ontario. Whole-tree bioenergy resulted in no GHG reduction for NG displacement, and a break-even point of 70-86 years for coal. A net GHG reduction of 67% and 16% was realized when roadside residues and whole trees were used to displace coal, compared to 45% and 38% when roadside residues were used to displace NG steam and NG electricity, respectively. Therefore, it is recommended that bioenergy deployment strategies focus on the utilization of roadside residues, if the main goal is GHG mitigation.
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| 47 |
THE BRONX COCKED BACK AND SMOKING MULTIFARIOUS PROSE PERFORMANCEAvila, Alex 01 June 2016 (has links)
The Bronx Cocked Back And Smoking is a collection of multifarious prose performances recounting the historical, personal, social, political and cultural constructs of a city birthed by violence. This body of work is accompanied by video, audio, photography, and theatre performance texts. St. Mary’s Housing project, in the Bronx, is the foundation where most of this literary work takes place. The modern day Griot (storyteller) is a Poet, guiding his audience through the social inequalities and disparities that plague St. Mary’s community. The Poet shares personal traumatic insights while simultaneously utilizing writing as a form of survival to the conditions of the Bronx. This multi-platform performance highlights the metaphorical and physical concerns with the cycle of violence. This question is answered through the Poet’s choice by selecting the pen over the gun.
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