The Shenandoah concentrator

A 7 meter diameter, parabolic dish solar collector was designed and developed for first application at Shenandoah, Georgia. Key features and requirements for the collector are outlined. Performance test results for collector testing at Sandia Laboratories in Albuquerque are summarized. The key features, requirements and performance of the solar collector subassemblies/subsystems are discussed: mount and drives, reflector, receiver, and collector control unit. Problems experienced during collector testing in Albuquerque are identified and solutions described

Solar total energy project at Shenandoah, Georgia system design

The solar total energy system (STES) was to provide 50% of the total electrical and thermal energy requirements of the 25,000 sq ft Bleyle of America knitwear plant located at the Shenandoah Site. The system will provide 400 kilowatts electrical and 3 megawatts of thermal energy. The STES has a classical, cascaded total energy system configuration. It utilizes one hundred twenty (120), parabolic dish collectors, high temperature (750 F) trickle oil thermal energy storage and a steam turbine generator. The electrical load shaving system was designed for interconnected operation with the Georgia Power system and for operation in a stand alone mode

La inclusión del mLearning en la práctica pedagógica de los docentes de la Universidad APEC

Johanna Altagracia Poche Rosado (biografía). Es ingeniera de sistemas de información egresada de la Universidad APEC. Ha realizado dos maestrías: una en Educación y Nuevas Tecnologías (Universidad a Distancia de Madrid, UDIMA, España), y otra en Planificación y Gestión de la Educación (Universidad Católica de Santo Domingo, UCSD). Tiene también un diplomado de UNAPEC en docencia universitaria y un diplomado de la UCSD en educación artística. Es técnica docente nacional del Ministerio de Educación de la República Dominicana, directora del Grupo de Folklore de UNAPEC e investigadora del folklore dominicano y del área educativa. Es una artista multidisciplinaria: artesana, bailarina y coreógrafa.Este artículo recoge los resultados de una investigación realizada para ponderar el estado de situación en que se encuentra la inclusión del mLearning (el aprendizaje mediante equipos tecnológicos móviles inalámbricos) en la Universidad APEC. Como se sabe, para que estos equipos puedan ser aprovechados en el proceso de enseñanza-aprendizaje, los contextos o entornos en los que operen deben ser “pedagógicamente diseñados”, es decir, debe haber una correcta planeación y diseño estratégico de su uso en las actividades didácticas de la clase, pues solo así podrán ayudar a desarrollar habilidades cognitivas. En este sentido, para que se logre potenciar sus posibilidades para la enseñanza, los docentes están conscientes de que deben usar estrategias que impidan su potencial capacidad de distracción y desconcentración del estudiante. Si su uso está debidamente enmarcado en el programa pedagógico, estos instrumentos pueden facilitar procesos de aprendizaje “personalizados, espontáneos e informales”, así como propiciar el trabajo colaborativo y la interactividad. En UNAPEC existe una infraestructura tecnológica que hace posible la incorporación del mLearning. Un 91% de los profesores consultados contempla el uso de computadores portátiles en sus clases, asignaciones o tareas, mientras que un 63% contempla el uso, para los mismos fines, de teléfonos inteligentes. El uso de tabletas o iPads, de reproductores MP3 o MP4 y de iPods es contemplado, respectivamente, por un 63, 36 y 36% de los profesores. En cualquier caso, los docentes recomendaron a las distintas escuelas la estructuración de planes específicos, en conformidad con sus necesidades y peculiaridades, que contribuyan a intensificar la incorporación de esta nueva modalidad de aprovechamiento educativo de las tecnologías de la comunicación y la información

The passion over perpetua: a new approach to the Passio Perpetuae et Felicitatis

Although the Passio Santarum Perpetuae et Felicitatis has received much scholarly attention in the past twenty years, it has been used primarily as a source of information on the martyr Perpetua. Other aspects of the account, such as its Montanist theology and its unique portrayal of women have been largely ignored by scholars interested in tearing it apart for relavent information on Perpetua. The Passio contains three distinct portions, each produced by a member from the religious community of Carthage in the early third-century C.E. It therefore serves as a unique historical window into early Christian North Africa, displaying a community in many ways theologically distinct from its most well known member, the apologist Tertullian. The author of the narrative portion of the account as well as the self-written account of the martyr Saturus have been marginalized due to the enormous stature of Perpetua, the first female martyr to write an account of her own persecution. In many cases, these two male figures are ignored due to a perceived relationship with Tertullian, who is looked upon with derision for his patriarchal attitudes toward women and their role in religious life. It is the purpose of this thesis to demonstrate that the Passio promotes a view of Christianity that is distinct from the one espoused by Tertullian’s writing. It will also show that the Passio presents a consistent set of theological themes in all three of its parts and offers a more progressive understanding of women as they function in the church than the one offered by Tertullian

Analyzing User Comments On YouTube Coding Tutorial Videos

Video coding tutorials enable expert and novice programmers to visually observe real developers write, debug, and execute code. Previous research in this domain has focused on helping programmers find relevant content in coding tutorial videos as well as understanding the motivation and needs of content creators. In this thesis, we focus on the link connecting programmers creating coding videos with their audience. More specifically, we analyze user comments on YouTube coding tutorial videos. Our main objective is to help content creators to effectively understand the needs and concerns of their viewers, thus respond faster to these concerns and deliver higher-quality content. A dataset of 6000 comments sampled from 12 YouTube coding videos is used to conduct our analysis. Important user questions and concerns are then automatically classified and summarized. The results show that Support Vector Machines can detect useful viewers\u27 comments on coding videos with an average accuracy of 77%. The results also show that SumBasic, an extractive frequency-based summarization technique with redundancy control, can sufficiently capture the main concerns present in viewers\u27 comments

Evaluating the Impacts of Metals on Aquatic Birds in Lake Chapala, and the Use of Stable Isotopes for Predicting the Attwater’s Prairie-Chicken Diet

The largest tropical lake in Mexico, Lake Chapala, is a major fishery and a recipient of many contaminants (industrial and agricultural) via the Lerma River. The objectives were to evaluate concentrations of mercury (Hg), aluminum (Al), barium (Ba), copper (Cu), manganese (Mn), strontium (Sr), vanadium (V), and zinc (Zn) in fish and wildlife of Lake Chapala. I also used stable isotopes carbon (δ¹³C) and nitrogen (δ¹⁵N) to determine trophic differences between the 3 collected fish species. I collected water, sediment, fish, and feather samples and measured these samples for Hg and other metals. Mercury concentrations in water were higher compared to other lakes around the world, but not as high as those determined from the Jose Antonio Alzate reservoir in Mexico. Sediment Hg concentrations were similar to those reported by other studies from Lake Chapala. Also, the Hg concentrations measured in fish were similar to those from other studies. Feather samples collected had a wide range of δD values; therefore using these values were not useful for predicting significant relationships between areas of feather growth and areas of Hg acquisition. Concentrations of other metals in water, sediments, and fish were also similar to those reported in previous studies. An Attwater’s prairie-chicken (APC) study was conducted to determine the diet of wild APC populations once released from captivity with the use of stable isotope analysis of δ¹³C and δ¹⁵N. I also compared historic and contemporary APC feather δ¹³C and δ¹⁵N values to one another. I collected vegetation, insect, fecal, and blood samples from APCs on the Attwater Prairie Chicken National Wildlife Refuge (APCNWR). The stable isotope analysis revealed the mixing model produces different results dependent on the number of diet sources used. When analyzing δ¹³C and δ¹⁵N from blood, the main diet source is C₃ vegetation (forbs) when 3, 4, and 5 diet sources are used. Historic feather’s δ¹³C and δ¹⁵N values showed that spiders (3 and 4 diet sources) and rice (5 diet sources) contributed the most to APC diet. Contemporary feather δ¹³C and δ¹⁵N values determined insects (3 sources), forbs (3 sources), and C₄ vegetation (grasses; 5 sources) contributed the most

Synthesis and Characterization of Linear and Star -Branched Poly(gamma-Stearyl-L-Glutamate).

The synthesis and characterization of linear and star branched poly($\gamma$-stearyl-L-glutamate) (PSLG) is reported. A new synthesis for N-carboxyanhydride (NCA) monomers was developed by employing bis(trichloromethyl)carbonate (triphosgene) to functionalize the corresponding $\alpha$-amino acid. Multi-functional primary amino initiators (central units) were synthesized to enable the production of three, four, six and nine arm star polymers by reaction of the central units with the desired NCA. Linear PSLG was produced by either sodium methoxide initiation or benzyl amine initiation of $\gamma$-stearyl-L-glutamate-N-carboxyanhydride (SLGNCA). The highest molecular weight polymers were produced from methoxide initiation. Other molecular weights can be produced from the same ratio of methoxide to monomer by varying the initial concentration of the monomer in the reaction. The polymers were characterized by \sp1H and \sp{13}C nuclear magnetic resonance (NMR), infrared spectroscopy (IR), differential scanning calorimetry (DSC), gel permeation chromatography (GPC), dynamic and static laser light scattering (DLS and SLS), and to a lesser extent by light microscopy. Also, molecular models of both the linear and the star polymers were produced using SYBYL. DSC analysis reveals two endothermic transitions; the lower temperature transition corresponding to the melting of the side chains and the second transition corresponding to a liquid crystalline phase transition of the melted polymer. SLS yielded weight average molecular weight, radius of gyration, and 2nd virial coefficient. From these data and corresponding DLS measurements, other PSLG dimensions were calculated such as the diameter, the hydrodynamic radius, and the length. A Mark-Houwink plot was constructed from the linear PSLG data. The lower functionality PSLG star polymers exhibit negative values for the 2nd virial coefficient when measured in tetrahydrofuran (THF) which is indicative of aggregation. DLS supported this interpretation of the virial coefficient. DSC thermograms also indicate a phase transition at about 68\sp\circC for the high molecular weight stars. GPC analysis of linear PSLG yielded a GPC calibration curve as well an indication of their polydispersity

Diplomado de profundización cisco (Diseño e implementación de soluciones integradas LAN/WAN).

La prueba de habilidades prácticas CCNA constituye una estrategia eficaz para verificar la pertinecia y el nivel de aprehensión de los temas desarrollados durante el curso, mediante la resolución de las situaciones problema planteadas se puede demostrar el nivel de conocimiento acerca de las redes y su configuración, otro aspecto importante que se aborda en el curso es la implementación de los simuladores, en este caso, la herramienta packet tracer, que es una de las mejores herramientas para la simulación de redes y su respectiva implementaciónThe CCNA practical skills test is an effective strategy to verify the relevance and level of apprehension of the topics developed during the course, by solving the problem situations raised, the level of knowledge about networks and their configuration can be demonstrated, Another important aspect addressed in the course is the implementation of the simulators, in this case, the packet tracer tool, which is one of the best tools for simulating networks and their respective implementatio