Estudio del campo magnético de un solenoide con experimento remoto y simulación

En este trabajo se describe una propuesta de ense&ntilde;anza basada en el concepto de aprendizaje colaborativo, que integra el uso de un experimento remoto y una simulaci&oacute;n, con los cuales se mide el campo magn&eacute;tico de un solenoide, y se lo calcula mediante la ley de Biot y Savart. El alumno puede comparar los resultados obtenidos a partir de estas herramientas cognitivas, con los que predice la ley de Ampere, y de esa forma comprender con mayor profundidad la funci&oacute;n que cumplen distintos modelos f&iacute;sicos que se usan para representar a un mismo sistema.El experimento remoto fue probado en dos talleres de capacitaci&oacute;n docente, y el dise&ntilde;o did&aacute;ctico fue validado con un grupo de alumnos que trabaj&oacute; con el mismo en forma voluntaria. La pro-puesta se pone a consideraci&oacute;n de otros colegas con la finalidad que la utilicen con sus alumnos, considerando a su vez que la misma puede ser perfeccionada en base a distintos aportes.</div

Advanced Orbiting Systems Test-Bedding and Protocol Verification

International Telemetering Conference Proceedings / October 30-November 02, 1989 / Town & Country Hotel & Convention Center, San Diego, CaliforniaThe Consultative Committee for Space Data Systems (CCSDS) is developing a set of communications protocols for Advanced Orbiting Systems (AOS). The National Aeronautics and Space Administration (NASA) and the European Space Agency (ESA) are cooperating in an effort to extensively validate these AOS protocols. This paper describes the techniques and facilities being used to perform this validation. Validation of the AOS protocols consists of (1) developing a formal specification of the protocols using a standard formal definition technique (FDT), (2) developing implementations of the protocols, and (3) remote testing of the implementations. From the FDT specifications, each agency is developing independent implementations which are consistent with the FDT specifications of the AOS protocols. Errors, omissions, or discrepancies detected during the development of the FDT specification and the implementation will be reported to the CCSDS and changes to the main specification will be suggested. The independent implementations will be extensively tested locally by the developing agency and then remotely tested through a cooperative test setup between the agencies. The implementations will interact to communicate between the agencies thus providing proof that the FDT specifications are sufficiently specific to be interpreted by everyone in the same way. Significant variations in the interpretations will result in feedback to the CCSDS and any needed changes to the main specification will be suggested. The AOS protocols are divided into four categories: Path, Space Link ARQ Protocol (SLAP), Space Link (SL), and Management. Each agency has agreed to be either the leader or support agency for each of the categories. NASA has agreed to be leader for the validation of the SLAP and SLS categories while ESA has agreed to lead in the validation of the Path and Management categories. Testbeds at the European Space Research and Technology Centre (ESTEC) in Noordwijk, Holland and at the MITRE Corporation in McLean, Virginia have been constructed for the development of FDT specifications and AOS protocol implementations. Communications facilities are being obtained which will connect these testbeds. This paper describes these testbeds, the AOS FDT specifications, the protocol implementations being developed, and the results expected from the tests performed.International Foundation for TelemeteringProceedings from the International Telemetering Conference are made available by the International Foundation for Telemetering and the University of Arizona Libraries. Visit http://www.telemetry.org/index.php/contact-us if you have questions about items in this collection

The effect of glucose on the hydration kinetics of ordinary portland cement

In this study, the application of fresh-wood-wool without any pre-treatment to produce wood-wool cement boards (WWCB) is investigated. The aim of this study is to create a binder which is less affected by the inhibitory substances of the wood-wool, without reducing the flexural strength properties of the boards. Moreover, the carbon footprint of WWCB is addressed by not using any waterglass and partly replacing cement with limestone powder in the boards production. First, the hydration behavior of different binders is studied by means of an isothermal calorimeter, including e.g. different types of cement, addition of glucose as a retarder, reduced anhydrite content in OPC and the use of limestone powder as a partial cement replacement. Then, boards are produced with fresh wood-wool and a newly developed binder recipe that is resulted from the hydration behavior analysis. The results show that the retarding effect of glucose is highly dependent on the chemical composition of the cement. In general, high amounts of C3A and C3S in a binder are favorable. When available, glucose reacts first with C3A, hence, less glucose is available to retard the other cement compounds like C3S. In addition, when using the fresh wood-wool in boards, the strength of the produced boards is increased. Furthermore, the water absorption of the wood is significantly reduced (20%), since it is already physically and chemically bound within the wood-wool. This enables a lower water demand that results in a denser packing of the binder and a reduced ion migration, leading to a mechanical strength increase. Furthermore, without the use of waterglass and the incorporation of limestone powder (36%) as a partial cement replacement, the CO2 footprint of the developed board fulfills the stated requirements, while possessing a reduced CO2 footprint

The effect of glucose on the hydration kinetics of ordinary portland cement

In this study, the application of fresh-wood-wool without any pre-treatment to produce wood-wool cement boards (WWCB) is investigated. The aim of this study is to create a binder which is less affected by the inhibitory substances of the wood-wool, without reducing the flexural strength properties of the boards. Moreover, the carbon footprint of WWCB is addressed by not using any waterglass and partly replacing cement with limestone powder in the boards production. First, the hydration behavior of different binders is studied by means of an isothermal calorimeter, including e.g. different types of cement, addition of glucose as a retarder, reduced anhydrite content in OPC and the use of limestone powder as a partial cement replacement. Then, boards are produced with fresh wood-wool and a newly developed binder recipe that is resulted from the hydration behavior analysis. The results show that the retarding effect of glucose is highly dependent on the chemical composition of the cement. In general, high amounts of C3A and C3S in a binder are favorable. When available, glucose reacts first with C3A, hence, less glucose is available to retard the other cement compounds like C3S. In addition, when using the fresh wood-wool in boards, the strength of the produced boards is increased. Furthermore, the water absorption of the wood is significantly reduced (20%), since it is already physically and chemically bound within the wood-wool. This enables a lower water demand that results in a denser packing of the binder and a reduced ion migration, leading to a mechanical strength increase. Furthermore, without the use of waterglass and the incorporation of limestone powder (36%) as a partial cement replacement, the CO2 footprint of the developed board fulfills the stated requirements, while possessing a reduced CO2 footprint

A new design for luminescent solar concentrating PV roof tiles

In our paper we explore the opportunity of combining luminescent solar concentrating (LSC) materials and crystalline PV solar cells in a new design for a roof tile by design-driven research on the energy performance of various configurations of the LSC PV device and on the aesthetic appeal in a roof construction. We present the roof tile in a system and executed optical modeling of the solar roof tile by MonteCarlo/ray-tracing simulations by PVtrace. We determined the range of appropriate values for thickness and dye concentration for the conceptual design of roof tile LSCs. It can be concluded that thickness of PMMA sheet material could best be in the range of 4 to 6 mm and the concentration of BASF Lumogen Red dye in between 80 and 1000 ppm. Because of aesthetic considerations however various concentration values may be used. In follow-up activities include a.o. parameter studies for different BASF Lumogen dyes and a pilot setup for testing the prototypes outdoors in the Netherlands

A new design for luminescent solar concentrating PV roof tiles

In our paper we explore the opportunity of combining luminescent solar concentrating (LSC) materials and crystalline PV solar cells in a new design for a roof tile by design-driven research on the energy performance of various configurations of the LSC PV device and on the aesthetic appeal in a roof construction. We present the roof tile in a system and executed optical modeling of the solar roof tile by Monte-Carlo/ray-tracing simulations by PV trace. We determined the range of appropriate values for thickness and dye concentration for the conceptual design of roof tile LSCs. It can be concluded that thickness of PMMA sheet material could best be in the range of 4 to 6 mm and the concentration of BASF Lumogen Red dye in between 80 and 1000 ppm. Because of aesthetic considerations however various concentration values may be used. In follow-up activities include a.o. parameter studies for different BASF Lumogen dyes and a pilot setup for testing the prototypes outdoors in the Netherlands