Paper Session I-B - Space-Based Communications

Current space lift launches on the Eastern and Western Range require extensive ground-based, real-time tracking, communications, and command/control systems. These systems are expensive to maintain and operate and cover only limited geographical areas. Future spaceports will require new technologies to provide greater launch and landing opportunities, support simultaneous missions, and offer enhanced decision support models and simulation capabilities. These ranges must also have lower costs and reduced complexity, while continuing to provide unsurpassed safety to the public, flight crew, personnel, vehicles, and facilities. Commercial and government space-based assets for tracking and communications offer many attractive possibilities to help achieve these goals. Figure 1 demonstrates the primary existing Eastern and Western Range instrumentation sites and a possible future space-based configuration

A model for the facilitation of intergenerational reconciliation during teenage pregnancy a Xhosa perspective

Teenage pregnancy is an international phenomenon with girls falling pregnant from as early as 14 years of age. In South Africa teenage pregnancies are also on the increase (Kaiser, 2000:18; Statistica SA, 2006:5;). Teenage pregnancy may have negative effects for the teenager in that it can force the teenager to drop out of school prematurely as well as shortening her educational career which might limit future career possibilities. It also predisposes both the mother and the child to health risks. Finally, teenage pregnancy also leads to family destabilisation. Within the Xhosa communities family destabilisation becomes even more severe as it is culturally and traditionally related. Traditionally, teenage pregnancy in the Xhosa communities is stigmatized. The family suffers from embarrassment and disappointment and the effects of these experiences can manifest in outrage on the part of the parents towards the pregnant teenager resulting in non-communication with her and ultimately rejection (Boult & Cunningham, 1991:36). This results in no or minimal support from the family (Nxumalo, 1997:16). The research design and method to achieve the objective of the study was a theory-generative design based on a qualitative, phenomenological, explorative, descriptive and contextual research approach utilizing the four steps of theory generation. During the step of concept analysis, which is the first step of the process of theory generation, data was collected by means of individual interviews with the pregnant Xhosa teenagers, parents and grandparents. The interviews were audio-taped and transcribed verbatim. The sample for the study was selected purposively to ensure indepth information

Spatiotemporal Path-Matching for Comparisons Between Ground- Based and Satellite Lidar Measurements

The spatiotemporal sampling differences between ground-based and satellite lidar data can contribute to significant errors for direct measurement comparisons. Improvement in sample correspondence is examined by the use of radiosonde wind velocity to vary the time average in ground-based lidar data to spatially match coincident satellite lidar measurements. Results are shown for the 26 February 2004 GLAS/ICESat overflight of a ground-based lidar stationed at NASA GSFC. Statistical analysis indicates that improvement in signal correlation is expected under certain conditions, even when a ground-based observation is mismatched in directional orientation to the satellite track

Space-Based Range Safety and Future Space Range Applications

The National Aeronautics and Space Administration (NASA) Space-Based Telemetry and Range Safety (STARS) study is a multiphase project to demonstrate the performance, flexibility and cost savings that can be realized by using space-based assets for the Range Safety [global positioning system (GPS) metric tracking data, flight termination command and range safety data relay] and Range User (telemetry) functions during vehicle launches and landings. Phase 1 included flight testing S-band Range Safety and Range User hardware in 2003 onboard a high-dynamic aircraft platform at Dryden Flight Research Center (Edwards, California, USA) using the NASA Tracking and Data Relay Satellite System (TDRSS) as the communications link. The current effort, Phase 2, includes hardware and packaging upgrades to the S-band Range Safety system and development of a high data rate Ku-band Range User system. The enhanced Phase 2 Range Safety Unit (RSU) provided real-time video for three days during the historic Global Flyer (Scaled Composites, Mojave, California, USA) flight in March, 2005. Additional Phase 2 testing will include a sounding rocket test of the Range Safety system and aircraft flight testing of both systems. Future testing will include a flight test on a launch vehicle platform. This paper discusses both Range Safety and Range User developments and testing with emphasis on the Range Safety system. The operational concept of a future space-based range is also discussed

Pedagogias trans/plurilíngues: Uma Multietnografia

Trans/plurilingual theory and pedagogies have been generating extensive attention within global English language teaching and teacher education. This article responds to the burgeoning area of trans/plurilingual pedagogies, outlining diverse pedagogical practices and perspectives from a group of English language educators at a large, cosmopolitan Canadian university. Considering recent assertions that there are onto-epistemological differences between multilingualism, plurilingualism, and translingualism, this article looks to demonstrate how (or even if) these differences manifest in the pedagogical practices of diverse faculty within the same language teaching and teacher education programs. Drawing on multiethnographic data, this article concludes with a discussion of the potential and limitations of critical pedagogies, the affordances of multiethnography as an accessible methodology for use by researchers and pedagogues, and a call for greater bi-directional knowledge flow between language researchers and classroom instructors.A teoria e as pedagogias trans/plurilíngues têm gerado uma atenção extensiva dentro do ensino global da língua inglesa e formação de professores. Este artigo responde à crescente área de pedagogias trans/plurilíngues, esboçando diversas práticas e perspectivas pedagógicas de um grupo de educadores de língua inglesa em uma grande e cosmopolita universidade canadense. Tomando como ponto de partida a afirmação recente de que existem diferenças epistemológicas entre multilinguismo, plurilinguismo e translinguismo, este artigo procura demonstrar como (ou mesmo se) essas diferenças se manifestam nas práticas pedagógicas de diversos docentes dentro de um mesmo programa de ensino de línguas e de formação de professores. Este artigo conclui com uma discussão sobre o potencial e as limitações das pedagogias "críticas", as possibilidades da multietnografia como uma metodologia acessível para uso por pesquisadores e pedagogos, e um apelo para um maior fluxo de conhecimento bidirecional entre pesquisadores de idiomas e instrutores de sala de aula

Gestión del Conocimiento: un modelo para los grupos de investigación del Instituto Nacional de Medicina Legal y Ciencias Forenses de Colombia.

Las Organizaciones han venido introduciendo en sus prácticas, cada vez con mayor frecuencia, modelos que les permitan ser más competitivos, más eficientes y eficaces, como respuesta al cambio constante de sus entornos internos y externos. Para esto, se han valido históricamente de herramientas de la Administración y la Gerencia, más específicamente de la Gestión. Las corrientes que han permeado más intensamente estos modelos, son las procedentes de la Gestión del Talento Humano, la Gestión de la Calidad y más recientemente la Gestión por Competencias. Cada uno de estos modelos centra su interés particular en un aspecto específico; las personas, los procesos, el saber hacer las cosas entre otras. Sin embargo, todas adolecen de un componente fundamental para lograr no sólo administrarlos adecuadamente, sino adicionalmente evolucionar hacia la innovación y el crecimiento permanente: la socialización del conocimiento. Esta es una realidad que afecta de manera muy drástica la investigación, el desarrollo y la innovación en el Instituto Nacional de Medicina Legal y Ciencias Forenses (INMLyCF).Magister en EducaciónMaestrí

Análisis con ATP de la respuesta dinámica del motor de inducción a los SAGs de voltaje

Se presenta un análisis que usa el EMTP/ATP para indagar acerca de la respuesta dinámica de motores de inducción ante un transitorio de voltaje tipo SAG. La respuesta de la máquina se relaciona con la magnitud del SAG y su duración. Los SAG representados incluyen SAG monofásicos y trifásicos, así como SAG secuenciales, debido a operaciones de re-cierres. El funcionamiento del motor se evalúa con respecto a la configuración de las protecciones en una máquina de inducción típica. Se demuestra que la configuración de las protecciones se puede ajustar para mejorar el funcionamiento del motor ante SAG de voltaje sin poner en riesgo la seguridad del motor

RELEASE OF 'BEJUCO-90 DÍAS' AND 'ARBUSTO' VELVETBEAN CULTIVARS

RELEASE OF 'BEJUCO-90 DÍAS' AND 'ARBUSTO' VELVETBEAN CULTIVAR

Adecuación tecnológica de la máquina de inyección de plástico del laboratorio de mecánica, de la Universidad Tecnológica de Pereira

Este proyecto muestra la adecuación tecnológica de la máquina de inyección de plástico del laboratorio de mecánica de la Universidad Tecnológica de Pereira. Como parte inicial del trabajo realizado se muestran los diferentes diseños de hardware electrónico de tal manera que la adecuación realizada trabaje en conjunto y de manera paralela a los dispositivos eléctricos ya instalados. Dentro de los dispositivos instalados se cuenta con software de Supervisión, Control y Adquisición de Datos (Supervisory Control And Data Acquisition) SCADA el cual interactúa con la máquina a través de una comunicación serial con un controlador lógico programable S7-200 Siemens este dispositivo es el intermediario entre el SCADA y las diferentes variables del proceso de modelado de plástico. El sistema SCADA Registra las temperaturas del tubo de plastificación, permite ajustar el Set Point de temperatura requeridos, tiempos asociados al proceso de plastificación, además permite seleccionar el modo de operación de la máquina entre manual y automático, también se puede ajustar el número de ciclos en el modo de operación automática.This project shows the technological adequacy of plastic injection machine, of the mechanics laboratory in the Technological University of Pereira. As initial part of this work, shows the different designs of electronic hardware so that the adequacy carried out work as a whole and in parallel with the electric and electronic devices already installed. inside the new installed devices, is provided with a control software and supervision called SCADA, which interacts with the machine through a direct communication with a programmable logical controller S7200; this device is the intermediary between the SCADA and the different variables associated with the process of molded of plastic pieces. The SCADA system recorded the temperatures of the plasticizing tube; allows you to adjust the temperature set points required; times associated with the process of plasticizing; also allows you to select the command of operation of the machine between manual and automatic, as final quality you can adjust the number of repetitions cyclical in the automatic operating mode

Characterization of Knots and Links Arising From Site-specific Recombination on Twist Knots

We develop a model characterizing all possible knots and links arising from recombination starting with a twist knot substrate, extending previous work of Buck and Flapan. We show that all knot or link products fall into three well-understood families of knots and links, and prove that given a positive integer $n$, the number of product knots and links with minimal crossing number equal to $n$ grows proportionally to $n^5$. In the (common) case of twist knot substrates whose products have minimal crossing number one more than the substrate, we prove that the types of products are tightly prescribed. Finally, we give two simple examples to illustrate how this model can help determine previously uncharacterized experimental data.Comment: 32 pages, 7 tables, 27 figures, revised: figures re-arranged, and minor corrections. To appear in Journal of Physics