Display system software for the integration of an ADAGE 3000 programmable display generator into the solid modeling package C.A.D. software

A software system that integrates an ADAGE 3000 Programmable Display Generator into a C.A.D. software package known as the Solid Modeling Program is described. The Solid Modeling Program (SMP) is an interactive program that is used to model complex solid object through the composition of primitive geomeentities. In addition, SMP provides extensive facilities for model editing and display. The ADAGE 3000 Programmable Display Generator (PDG) is a color, raster scan, programmable display generator with a 32-bit bit-slice, bipolar microprocessor (BPS). The modularity of the system architecture and the width and speed of the system bus allow for additional co-processors in the system. These co-processors combine to provide efficient operations on and rendering of graphics entities. The resulting software system takes advantage of the graphics capabilities of the PDG in the operation of SMP by distributing its processing modules between the host and the PDG. Initially, the target host computer was a PRIME 850, which was later substituted with a VAX-11/785. Two versions of the software system were developed, a phase 1 and a phase 2. In phase 1, the ADAGE 3000 is used as a frame buffer. In phase II, SMP was functionally partitioned and some of its functions were implemented in the ADAGE 3000 by means of ADAGE's SOLID 3000 software package

A fast acting electrical servo for the actuation of full span, Fowler-type wing flaps in DLC applications: A detail design study

The philosophy and detail design of an electro-mechanical actuator for Fowler-type wing flaps which have a response time constant of 0.025 seconds are described. A conventional electrical servomotor with a power rating twice the maximum power delivered to the load is employed along with adaptive, gain-scheduled feedback and various logic circuits, including one to remove electrical excitation from the motor during extended periods when no motion of the flap is desired

Systems development of a stall/spin research facility using remotely controlled/augmented aircraft models. Volume 1: Systems overview

A ground based, general purpose, real time, digital control system simulator (CSS) is specified, developed, and integrated with the existing instrumentation van of the testing facility. This CSS is built around a PDP-11/55, and its operational software was developed to meet the dual goal of providing the immediate capability to represent the F-18 drop model control laws and the flexibility for expansion to represent more complex control laws typical of control configured vehicles. Overviews of the two CSS's developed are reviewed as well as the overall system after their integration with the existing facility. Also the latest version of the F-18 drop model control laws (REV D) is described and the changes needed for its incorporation in the digital and analog CSS's are discussed

Bioinspired snapping-claw apparatus to study hydrodynamic cavitation effects on the corrosion of metallic samples

A creative low-cost and compact mechanical device that mimics the rapid closure of the pistol shrimp claw was used to conduct electrochemical experiments, in order to study the effects of hydrodynamic cavitation on the corrosion of aluminum and steel samples. Current-time curves show significant changes associated with local variations in dissolved O2 concentration, cavitation-induced erosion and changes in the nature of the surface corrosion products

Restructurable Controls

Restructurable control system theory, robust reconfiguration for high reliability and survivability for advanced aircraft, restructurable controls problem definition and research, experimentation, system identification methods applied to aircraft, a self-repairing digital flight control system, and state-of-the-art theory application are addressed

Flujos de mineralización en el embalse tropical Río Grande II(Antioquia, Colombia)

Se emplearon dos sistemas de cinco trampas de sedimentos colocados en la zona de la presa del embalse de Río grande II (6·32,62' N, 75·27,27' W). Se tomaron muestras cada diez días entre abril de 2003 y julio del mismo año, con el fin de determinar cuál era la velocidad de la mineralización del material particulado y si ésta variaba en relación con los cambios en la altura de mezcla. Se presentó una tendencia en la que el amonio fluctuó con la altura de la capa de mezcla y con la temperatura del agua. Se evidenció que con el aumento en la altura de la capa de mezcla disminuía la mineralización del amonio y la profundidad a la que ocurre no variaba, manteniéndose la mayor descomposición de la materia orgánica sobre la segunda trampa. Para los nitratos, el consumo superó la liberación con el aumento de la temperatura del agua y de la altura de mezcla. El flujo de mineralización del fósforo presentó un valor negativo durante la investigación, lo que se asoció a una tasa de consumo permanente en el sistema. Además, el fósforo mostró una tendencia a disminuir su concentración con la profundidad, lo que no se ha reportado para un embalse tropical térmicamente estable.Two systems of five sediment traps were placed in the area of the dam of the Río Grande II reservoir (6·32,62' N, 75·27,27' W). Every ten days from April 2003 to July 2003 samples were taken with the purpose of determine the speed of mineralization of the particulate material and if it changes in relation to the mixing height. There was a tendency in which the ammonium fluctuated in relation to the height in the mixing layer and the temperature of the water. It was evidenced that with the increase in the height of the mixing layer the ammonium mineralization diminished; whereas the depth of mineralization didn't vary and the highest decomposition still occurred in the second trap. For nitrates, with the increase in temperature and the mixing height its consumption was higher than its liberation. Phosphorus mineralization flux showed a negative value during the investigation; it was associated to a rate of permanent consumption in the system. Phosphorus also showed a tendency to diminish its concentration with depth; this behavior has not been registered for a thermically stable tropical reservoir

The Bak-Sneppen Model on Scale-Free Networks

We investigate by numerical simulations and analytical calculations the Bak-Sneppen model for biological evolution in scale-free networks. By using large scale numerical simulations, we study the avalanche size distribution and the activity time behavior at nodes with different connectivities. We argue the absence of a critical barrier and its associated critical behavior for infinite size systems. These findings are supported by a single site mean-field analytic treatment of the model.Comment: 5 pages and 3 eps figures. Final version appeared in Europhys. Let

Perdas de solos em Sistemas Agroflorestais com Bracatinga (Mimosa scabrella), sob diferentes manejos e declividades.

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