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Commercial fluorine production is conducted from KF.2HF melts at 85C in Monel cells that are subject to corrosion. Here we report studies of passivation and depassivation of the Monel in relation to that of Ni, its principal (65 wt % ) constituent, by means of cyclic voltammetry and recording of open-circuit potential-relaxation transients. The latter exhibit arrests at characteristic Flade-type potentials and lead to information on the kinetics of passive film breakdown. The role of diffusion processes in such breakdown and film dissolution is evaluated using the rotating disc electrode technique which enables comparisons to be made with the passivation behaviour of the separate main components of Monel, viz. Ni and Cu. 相似文献
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Membrane catalytic reactor (MCR) combing catalytic reaction with membrane separating process has exhibited a promising pathway to improve reaction conversion and selectivity for its selective permeating products online or controlling the addition of key reactants. In this work, three types of supported membranes (i.e. silica inorganic membrane, polyimide-silica and polyimide-titania hybrid membranes) and copper catalyst supported on MgO–SiO2 composite substrate modified by KF were prepared, were used as MCRs materials and catalyst, respectively, for the direct synthesis of dimethyl carbonate (DMC) from carbon dioxide and methanol. The influences of operating conditions on the conversion of methanol and the selectivity to DMC were discussed. The results show that hybrid membranes have excellent thermal and hydrophilic properties and that water vapor diffusing through them obeyed surface flow mechanism. The reaction behaviors of MCR are higher than those of CCR with the conversion of methanol improved remarkably and the selectivity to DMC increase a few under proper reaction conditions. The catalytic reaction performances are controlled mainly by the characters of catalyst, and the incorporation of MCRs has not changed the reaction mechanism, which played the primary roles as the concentration distributors in the catalytic reaction system. 相似文献
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For the missile with passive seeker,the improvement of passive ranger’s precision is one of the key issues in development of the defense penetrate strategy. On the offensive warheads,the infrared imaging device was used to measure the line-of-sight angle information of the blocker,and then using the algorithm of Kalman Filter under polar coordinates,the distance from the blocker to the warheads was obtained. The simulation result under polar coordinates was compared with that of Cartesian coordinate. The validity of the method was analyzed,and the schemes of improvement were brought out. 相似文献
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A control-based full state observer scheme is explored for video target tracking application, and is enhanced with a lowpass
filter for improving the tracking precision, thus forming an Enhanced Full State Observer (EFSO). The whole design is based
on the given lab-generated video sequence with motion of an articulate target. To evaluate the EFSO’s stochastic noise tolerance,
a Kalman Filter (KF) is intentionally employed in tracking the same target with the given Gaussian white noises. The comparison
results indicate that, for system noises of certain statistics, the proposed EFSO has its own noise resistance capacity that
is superior to that of KF and is more advantageous for implementation. 相似文献