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Evaporated naked silver nanoparticles (Ag-NPs) were embedded in the isolated layer of PTB7-based organic field-effect transistors (OFETs), where their electric bistability behavior was successfully activated by photo-irradiation. These devices showed no obvious memory behavior in the dark; while under weak photo-irradiation (0.015 mW cm), memory windows of 12.5-35 V have been achieved. Different operation modes have been designed to exhibit the memory behavior and to explore the origin of the formation of a stable charge state. The immobilized photo-generated electrons supplied an additional photo-generated electric field, which confined the trapped charge in the charge storage media after the gate voltage and photo-irradiation being removed. The photo-irradiation created more charges at the interface, and the presence of Ag-NPs allowed effective charge storage of the majority carriers, which increased the drain current and lowered the gate-operating voltage. This method is a novel approach to light-activated electric bistability based charge storage.

This paper uses cabbage as raw material to ferment kimchi through lactic acid bacteria inoculation. Using sensory score, total acid, pH and nitrite content as indicators, the main factors affecting the fermentation of lactic acid bacteria inoculated kimchi were investigated. The optimum technological conditions for inoculating fermentation of Kimchi lactic acid bacteria were determined by experiments. The lactic acid bacteria grow rapidly during the fermentation process and produce lactic acid, which lowers the pH value of the kimchi. The protein in the kimchi is decomposed into free amino acids, and the calcium ions are combined into inorganic salts, which have high nutritional value.