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Abstract The small-deformation theory of elastic-plastic response, due to Prandtl and Reuss, is the basis of most analytical treatments of elastic-plastic behavior. This model is examined from a modern perspective. The shifter concept is combined with the convected coordinate formalism to cast the theory in a manner that ensures its invariance under a change of frame, in contrast to conventional expositions of the small-deformation theories of elasticity and elasto-plastic response
In this letter we illustrate three methods of using nonlinear devices as sensors. We show that the sensory features of these devices is a result of sensitive dependence on parameters which we show is equivalent to sensitive dependence on initial conditions. As a result, we conjecture that sensitive dependence on initial conditions is nature’s sensory device in cases where remarkable feats of sensory perception are seen.
No abstract is provided for this article.
Inspired by human vision, we propose a new periphery-fovea multi-resolution driving model that predicts vehicle speed from dash camera videos. The peripheral vision module of the model processes the full video frames in low resolution with large receptive fields. Its foveal vision module selects sub-regions and uses high-resolution input from those regions to improve its driving performance. We train the fovea selection module with supervision from driver gaze. We show that adding high-resolution input from predicted human driver gaze locations significantly improves the driving accuracy of the model. Our periphery-fovea multi-resolution model outperforms a uni-resolution periphery-only model that has the same amount of floating-point operations. More importantly, we demonstrate that our driving model achieves a significantly higher performance gain in pedestrian-involved critical situations than in other non-critical situations. Our code is publicly available at https://github.com/pascalxia/periphery_fovea_driving.
Electroluminescence from a nanowire array-based light emitting diode is reported. The junction consists of a p-type GaN thin film grown by metal organic chemical vapor deposition (MOCVD) and a vertical n-type ZnO nanowire array grown epitaxially from the thin film through a simple low temperature solution method. The fabricated devices exhibit diode like current voltage behavior. Electroluminescence is visible to the human eye at a forward bias of 10 V and spectroscopy reveals that emission is dominated by acceptor to band transitions in the p-GaN thin film. It is suggested that the vertical nanowire architecture of the device leads to waveguided emission from the thin film through the nanowire array.
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
Abstract DAMAGE-PREDICTOR, the computer code with the capability of simultaneously estimating the concentrations of radiolysis species, the electrochemical corrosion potential (ECP), and the crack growth rate of a reference crack in sensitized Type 304 stainless steels, was used to evaluate the responses of Dresden-2 and Duane Arnold boiling water reactors (BWRs) to hydrogen water chemistry (HWC) with the application of general catalysis (increasing the exchange current density) and general inhibition (decreasing the exchange current density). HWC simulations for these two BWRs were carried out for feedwater hydrogen concentrations of 0.0, 0.5, and 1.0 ppm and for exchange current density multipliers of 10−4 (general inhibition) and 104 (general catalysis). Species concentrations (H2, O2, H2O2, etc.), electrochemical corrosion potential (ECP), and crack growth rate were predicted for the entire heat transport circuits (HTCs) of the two reactors. It is predicted that both techniques arc able to greatly improve the effectiveness of HWC for protecting the entire heat transport circuits of Dresden-2 and Duane Arnold. However, while operated under normal water chemistry, both reactors are predicted to become more susceptible to IGSCC because of the elevated ECP resulting from general catalysis. We emphasize, however, that this conclusion is tentative because the increase in the exchange current density values for general catalysis have not been experimentally determined.
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
