Factors affecting algal biomass growth and cell wall destruction

Research using microalgae Chlorella vulgaris was conducted in order to determine the maximum CO2 concentration under which algae can grow, within the emission range from oil and natural gas burning plants (0-20%). After choosing the optimal CO2 percentage, pH and alkalinity were determined; and finally, an electrochemical (EC) batch reactor connected to DC current was applied to achieve algae cell annihilation, and therefore, facilitate anaerobic digestion, methane production and energy recovery. It was determined that algae can grow under 20% CO2, being 15% CO2 the most effective (pH of 6.64 and alkalinity of 617.5 mg/L CaCO3). Electroporation using an electrochemical batch reactor is effective in breaking cells membranes, which simplifies anaerobic digestion process and methane production. The parameters found effective for completely breaking the algae cell are: detention time of 1 more or less 0.5 minutes, and minimum voltage and current of 65 Volts/285 ml and 3.9 Amps/285 ml, respectivel

Factors affecting algal biomass growth and cell wall destruction

Research using microalgae Chlorella vulgaris was conducted in order to determine the maximum CO2 concentration under which algae can grow, within the emission range from oil and natural gas burning plants (0-20%). After choosing the optimal CO2 percentage, pH and alkalinity were determined; and finally, an electrochemical (EC) batch reactor connected to DC current was applied to achieve algae cell annihilation, and therefore, facilitate anaerobic digestion, methane production and energy recovery. It was determined that algae can grow under 20% CO2, being 15% CO2 the most effective (pH of 6.64 and alkalinity of 617.5 mg/L CaCO3). Electroporation using an electrochemical batch reactor is effective in breaking cells membranes, which simplifies anaerobic digestion process and methane production. The parameters found effective for completely breaking the algae cell are: detention time of 1 more or less 0.5 minutes, and minimum voltage and current of 65 Volts/285 ml and 3.9 Amps/285 ml, respectivel

A Publish-Subscribe Implementation of Network Management

MEng thesisAs modern networks become highly integrated, heterogeneous, and experience exponential growth, the task of network management becomes increasingly unmanageable for network administrators and designers. The Knowledge Plane (KP) is designed to support a self-managing network, given the organizational constraints of network management, as well as to create synergy and exploit commonality among network applications. In this thesis, to build an Information Plane that is suitable to the requirements of the KP, we propose a publish/subscribe system that provides a clear and systematic framework for resolving tussles in the network. To evaluate the effectiveness of this design, we configured a network of PlanetLab nodes and conducted experiments involving a variety of file sizes and source-destination pairs. The results suggest that the system's performance is not only comparable to existing file transfer services, but that the system also introduces several performance gains that are unattainable with current network architectures

A publish-subscribe implementation of network management

Thesis: M. Eng., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2013.This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.Cataloged from student-submitted PDF version of thesis.Includes bibliographical references (pages 75-77).As modern networks become highly integrated, heterogeneous, and experience exponential growth, the task of network management becomes increasingly unmanageable for network administrators and designers. The Knowledge Plane (KP) is designed to support a self-managing network, given the organizational constraints of network management, as well as to create synergy and exploit commonality among network applications. In this thesis, to build an Information Plane that is suitable to the requirements of the KP, we propose a publish/subscribe system that provides a clear and systematic framework for resolving tussles in the network. To evaluate the eectiveness of this design, we configured a network of PlanetLab nodes and conducted experiments involving a variety of le sizes and source-destination pairs. The results suggest that the system's performance is not only comparable to existing le transfer services, but that the system also introduces several performance gains that are unattainable with current network architectures.by Jorge D. Simosa.M. Eng

Efecto de combinaciones de humus de lombriz roja (Eisenia fetida L.) y fertilizante químico en el rendimiento de tres cultivares de pimentón (Capsicum annuum L.)

El experimento se realizó en un suelo franco arenoso, pH 6,0 y M.O: 1,38% en la localidad de Aguas Claras, estado Monagas para evaluar el efecto de las combinaciones de humus y el fertilizante químico:14 - 14 -14 - 14/3 en las proporciones, 100-0, 75-25, 50-50, 25-75 y 0-100 respectivamente, en los cultivares Enter-Price, Júpiter y Martha sobre el rendimiento de frutos. Se utilizo el diseño estadístico de bloques completos al azar en arreglo factorial (5×3) con quince tratamientos y tres repticiones. Las parcelas fueron de tres surcos de seis metros de longitud separados a 0,80 m y la distancia entre plantas de 0,40 m. El transplante se efectuó a los 42 días. Las combinaciones se aplicaron siete días después del transplante. Se realizaron cinco cosechas, iniciándose 62 días después del transplante. Las diferencias entre las medias se determino a través de la prueba de rangos múltiples de Duncan (a = 0,05). Se concluye que el cv. Martha produjo las plantas más altas (64,2 cm) en la dosis de 0% - 100% . Los cultivares Júpiter (13,429 t/ha) y Martha (13,102 t/ha) produjeron los mejores rendimientos de frutos. Las dosis 0% - 100% (14,783 t/ha), 25% - 75% (14,037 t/ha) y 50% - 50% (13,752 t/ha) produjeron los mejores rendimientos de frutos sin diferencias entre ellas