43,849 research outputs found
Miniature vibration isolator Patent
Miniature vibration isolator utilizing elastic tubing materia
Modelling and measurement accuracy enhancement of flue gas flow using neural networks
This paper discusses the modeling of the flue gas flow in industrial ducts and stacks using artificial neural networks (ANN's). Based upon the individual velocity and other operating conditions, an ANN model has been developed for the measurement of the volume flow rate. The model has been validated by the experiment using a case-study power plant. The results have shown that the model can largely compensate for the nonrepresentativeness of a sampling location and, as a result, the measurement accuracy of the flue gas flow can be significantly improved
Platform-basin transitions and their role in Alpine-style collision systems : a comparative approach
CB acknowledges financial support from Optimus (Aberdeen) ltd. Petroceltic International plc are thanked for providing access to the subsurface data used in this study and for permission to publish images used here. Schlumberger are thanked for providing use of Petrel software under their academic agreement with the University of Aberdeen. RWHB thanks the organisers of the 12th Emile Argand Conference on Alpine Geological Studies for the invitation and financial support to participate in the Montgenevre workshop. Reviewers Enrico Tavarnelli, Thierry Dumont and editors Christian Sue and Stefan Schmid are all thanked for their comments that have significantly improved this contribution.Peer reviewedPublisher PD
Hoop/column antenna deployment mechanism overview
The hoop/column antenna program is directed toward the development of a cost effective, large area, self deploying reflector antenna system. Large surface area antenna systems are required in future space missions involving improved land communications, Earth resources observation, and the study of intergalactic energy sources. The hoop/column antenna is a concept where a large antenna system can be packaged within the Space Transportation System (Shuttle) payload bay, launched into Earth orbit where it is released either for deployment as an Earth observation or communications antenna, or boosted into deep space as an intergalactic energy probe. Various mechanisms and support structures are described that are required to deploy the hoop, which is used to support the antenna reflective surface, and the column that is used to position the antenna feeds and the reflector. It also describes a proof-of-concept model (15 meters in diameter) that is currently being ground tested to determine the adequacy of the deployment mechanisms
Spin Dependent Tunneling in FM|semiconductor|FM structures
Here we show that ordinary band structure codes can be used to understand the
mechanisms of coherent spin-injection at interfaces between ferromagnets and
semiconductors. This approach allows the screening of different material
combinations for properties useful for obtaining high tunneling
magnetoresistance (TMR). We used the Vienna Ab-initio Simulation Code (VASP) to
calculate the wave function character of each band in periodic epitaxial
Fe(100)|GaAs(100) and Fe(100)|ZnSe(100) structures. It is shown that Fe wave
functions of different symmetry near Fermi energy decay differently in the GaAs
and ZnSe.Comment: Accepted for publication in MMM'05 Proceedings. 7 pages, 5 figure
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