105,927 research outputs found
Dual Gate LTPS TFT versus Oxide TFT
There is of increasing interest for dual gate, dual sweep driving for TFTs to have higher drain current. We studied the dual gate structure of a-IGZO TFT by dual sweep, exhibiting much higher drain currents and better threshold voltage and smaller subthreshold swing. In this work we studied the dual gate LTPS TFTs and found very different results. The increase in drain current of LTPS TFT is found but the threshold voltage and SS are similar to those of a single gate TFT
A Class of Randomized Primal-Dual Algorithms for Distributed Optimization
Based on a preconditioned version of the randomized block-coordinate
forward-backward algorithm recently proposed in [Combettes,Pesquet,2014],
several variants of block-coordinate primal-dual algorithms are designed in
order to solve a wide array of monotone inclusion problems. These methods rely
on a sweep of blocks of variables which are activated at each iteration
according to a random rule, and they allow stochastic errors in the evaluation
of the involved operators. Then, this framework is employed to derive
block-coordinate primal-dual proximal algorithms for solving composite convex
variational problems. The resulting algorithm implementations may be useful for
reducing computational complexity and memory requirements. Furthermore, we show
that the proposed approach can be used to develop novel asynchronous
distributed primal-dual algorithms in a multi-agent context
An analysis of the effects of secondary reflections on dual-frequency reflectometers
The error-producing mechanism involving secondary reflections in a dual-frequency, distance measuring reflectometer is examined analytically. Equations defining the phase, and hence distance, error are derived. The error-reducing potential of frequency-sweeping is demonstrated. It is shown that a single spurious return can be completely nullified by optimizing the sweep width
An Experimental Investigation of Dual-Injection Strategies on Diesel-Methane Dual-Fuel Low Temperature Combustion in a Single Cylinder Research Engine
The present manuscript discusses the performance and emission benefits due to two diesel injections in diesel-ignited methane dual fuel Low Temperature Combustion (LTC). A Single Cylinder Research Engine (SCRE) adapted for diesel-ignited methane dual fuelling was operated at 1500 rev/min and 5 bar BMEP with 1.5 bar intake manifold pressure. The first injection was fixed at 310 CAD. A 2nd injection sweep timing was performed to determine the best 2nd injection timing (as 375 CAD) at a fixed Percentage Energy Substitution (PES 75%). The motivation to use a second late injection ATDC was to oxidize Unburnt Hydrocarbons (HC) generated from the dual fuel combustion of first injection. Finally, an injection pressure sweep (550-1300 bar) helped achieve simultaneous reduction of HC (56%) and CO (43%) emissions accompanied with increased IFCE (10%) and combustion efficiency (12%) w.r.t. the baseline single injection (at 310 CAD) of dual fuel LTC
Oxygen permeation through oxygen ion oxide-noble metal dual phase composites
Oxygen permeation behaviour of three composites, yttria-stabilized zirconia-palladium, erbia-stabilized bismuth oxidenoble metal (silver, gold) was studied. Oxygen permeation measurements were performed under controlled oxygen pressure gradients at elevated temperatures. Air was supplied at one side of a dense sintered disk specimen, while helium was fed at the opposite side to sweep away the permeated oxygen. This research has demonstrated that in addition to the presence of percolative metal phase in the oxide matrix, a large ionic conductivity of the oxide phase and a high catalytic activity of the metal phase towards surface oxygen exchange are required for the dual phase composite to possess high oxygen permeability. The bismuth oxide-silver composite fulfils these requirements, hence showing the best oxygen permeability
A Dual-Engine for Early Analysis of Critical Systems
This paper presents a framework for modeling, simulating, and checking
properties of critical systems based on the Alloy language -- a declarative,
first-order, relational logic with a built-in transitive closure operator. The
paper introduces a new dual-analysis engine that is capable of providing both
counterexamples and proofs. Counterexamples are found fully automatically using
an SMT solver, which provides a better support for numerical expressions than
the existing Alloy Analyzer. Proofs, however, cannot always be found
automatically since the Alloy language is undecidable. Our engine offers an
economical approach by first trying to prove properties using a
fully-automatic, SMT-based analysis, and switches to an interactive theorem
prover only if the first attempt fails. This paper also reports on applying our
framework to Microsoft's COM standard and the mark-and-sweep garbage collection
algorithm.Comment: Workshop on Dependable Software for Critical Infrastructures (DSCI),
Berlin 201
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