A wearable interactive device that can synchronously detect and visualize pressure, stimuli will supplement easily identifiable in situ signals with conventional sensing that outputs only electronic signals. Currently, most interactive devices are composed of physically connected separate pressure sensors and display elements, which do not conform to the development of miniaturization and high integration. The realization of combining these two functions in one device with a simplified configuration is still only beginning to be explored. Inspired by the two-in-one response of the octopus, which can both sense and visualize stimuli, an integrated hybrid device based on ionic sensing and electrochromic display is proposed for interactive pressure perception. By efficiently reusing the electrodes and ionic gel, the device enables quantitative sensing and direct color changing in response to pressure. Benefiting from its excellent comprehensive performance, the applications are explored and verified, including the interactive perception of pressure information, hiding and display of visual information under pressure regulation, and repeated writing and erasing on flexible boards. Notably, multiple customized systems with improved design flexibility are implemented to provide remote monitoring and visual warning of behavioral states and physiological parameters. This study diversifies solutions to realize a direct link between pressure detection and visualization.

Many gas emission accidents have occurred in the Zhaozhuang coal mine in recent years, so an experiment and simulation study on Zhaozhuang coal adsorption of gas were conducted to explore the adsorption mechanism to allow for the prediction and prevention of gas accidents. The Zhaozhuang coal molecular model was constructed based on a proximate analysis, ultimate analysis, X-ray photoelectron spectroscopy (XPS), and solid-state 13 C nuclear magnetic resonance spectroscopy (NMR). Molecular mechanics (MM) and molecular dynamics (MD) were applied to optimize the chemical structure model of the coal molecule, and the periodic boundary condition was added via the relationship between energy and density. The adsorption behavior of methane in a single coal molecule was studied using the Grand Canonical Monte Carlo (GCMC) method. The experimental method was used to study the adsorption of gas from Zhaozhuang coal. The results show that the aromatic compounds mainly exist in the form of a benzene ring; the aliphatic structure mainly exists in the form of aliphatic side chains and cycloalkanes; oxygen atoms exist in the form of carbonyl group, ether group, and carboxyl group; and nitrogen atoms exist in the form of pyridine and pyrrole in the coal molecular structure. The final density of the Zhaozhuang coal molecular model is 1.15 g/cm 3 . The relative adsorption error of the Langmuir adsorption constant (a) is 3.303%, indicating that it is feasible to study the adsorption behavior of methane by constructing coal molecules. A saturated state is reached after absorbing eight methane molecules per coal molecule. The adsorption of methane by the oxygen functional group in the coal molecule is caused by both the adsorption position and the adsorption direction, where the carbonyl group has the greatest influence on adsorption of methane. The results of the simulated adsorption have a good predictive effect on the gas pressure, gas content, gas extraction, and gas disasters in the mining area.

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Articles you may be interested inSimulation of AlGaN/GaN high-electron-mobility transistor gauge factor based on two-dimensional electron gas density and electron mobilityThe intrinsic mechanisms of drain lag and current collapse in GaN-based high-electron-mobility transistors are studied by using two-dimensional numerical simulations. Simulated drain lag characteristics are in good agreement with reported experimental data. The dynamic pictures of trapping of hot electrons under drain-pulse voltages are discussed in detail. Hot-electron buffer-trapping effect plays an instrumental role in the current collapse mechanism. Polarization-induced interface charges have significant effect on the hot-electron buffer trapping and the current collapse can be weakened by increasing the interface charges. The trapped charges can accumulate at the drain-side gate edge, where the electric field significantly changes and gate-to-drain-voltage-dependent strain is induced, causing a notable current collapse. The simulation results show that the drain voltage range, beyond 5 V, is already in the field of the well-developed hot electron regime. The hot electrons can occupy a great number of traps at the drain-side gate edge leading to the current collapse at high drain bias ͑around 10 V͒, where the hot-electron trapping effect dominates. By considering quantum-well high-electron-mobility transistors, we find that better electron localization can reduce the current collapse.