Bondability of RTV silicon rubber

Glow discharge method for producing a bondable Room Temperature Vulcanizing (RTV) silicone is described. Mechanical and chemical properties of silicone specimens are described. Theory concerning the relationship between surface characteristics and bondability is examined with respect to the polymer specimen

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

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

Recovering Beam Search Approach for the Multi-Skill Project Scheduling Problem

International audienc

Space Pioneers and where they are now

A description of the Pioneer project, its history and achievements is given. Major discoveries concerning near and interplanetary space, the planets, and various comets are outlined. Anticipated future observations are considered. A list of Pioneer project launches, 1986 statuses, and project firsts is given

Indicação de espécies florestais para implantação de prática silvipastoril "bosquetes de proteção", para a região dos campos gerais, Paraná.

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Control of a charging station for electric vehicles

A weighted average current control applied to a three-phase inductor-capacitor-inductor grid-connected battery charger for electric vehicles is presented in this paper. The proposed controller is based on a combination of the partial currents of the system (inverter and grid currents), which are feedback into the control loop. Therefore, by using this approach a reduction of the system order is achieved. The proposed controller allows a bidirectional control of the converter currents, thus allowing both, a controlled charge of the battery and the injection of the current with low distortion in the grid. Further, the implemented controller does not needs to measure the inverter currents. The control strategy is validated with simulation results. © Published under licence by IOP Publishing Ltd

Introdução do componente florestal como fator de desenvolvimento da agricultura familiar no nordeste gaúcho.

bitstream/CNPF-2009-09/39417/1/com_tec139.pd

Effects of High Heeled Gait on Knee Joint Mechanics

Numerous women wear high heeled shoes, whether it be a professional attire, part of an outfit for a ballroom gala, or just casual day to day wear. Often, the high heel of choice in these situations is the stiletto. These shoes adversely affect natural gait and have the potential to alter joint mechanics in the knee during gait. PURPOSE: This study is designed to analyze the impacts of wearing high heels, and if it puts the user at a higher risk of a degenerative condition with repeated use. We hypothesized that all of our dependent variables would see a significant increase when wearing high heels. METHODS: For the scope of this project, we narrowed our analysis to the knee joint and ground reaction force loading rate. We designed this study using a Cortex motion capture system along with force plates to conduct a series of experiments. Six college aged women with experience walking in high heels and no injury or condition that would adversely affect normal gait were selected to participate in motion analysis experiments. There are 4 trials conducted in total, which include walking, and performing a lateral stepping motion to simulate dancing, each under barefoot and high heeled conditions. The variables we set out to analyze include knee compressive force, flexion moment, varus and valgus moments, ground loading rate, and EMG peak activity for muscles including medial and lateral gastrocnemius, vastus lateralis, and biceps femoris. All force data was normalized by body weight to compare across participants. RESULTS: After processing the data and performing a statistical analysis using a paired T-test with significance of α \u3c 0.05, we found the variables with a significant difference between barefoot and high heels is the knee compressive force during gait (P = 0.001) and loading rate from the ground reaction force (P = 0.009). CONCLUSION: This indicates that wearing high heels can significantly increase knee joint loading