No abstract

No abstract

Glass ceramics composed of Na2O–BaO–Bi2O3–Nb2O5–Al2O3–SiO2 (NBBN-AS) were modified by rare-earth doping and prepared via the melt-quenching process accompanied by controlled crystallization. High-resolution transmission electron microscopy displayed the glassy matrix closely encompassing the nanosized NaNbO3, Ba2NaNb5O15, BaAl2Si2O8, and AlNbO4 crystalline grains. With rare-earth doping, the NBBN-AS glass ceramics’ theoretical energy storage density can reach 22.48 J/cm3. This excellent energy storage property is credited with increasing breakdown strength, and numerical simulation was applied to reveal the intrinsic mechanism for increased breakdown strength by rare-earth doping. The charge–discharge results indicated a giant power density of 220 MW/cm3 as well as an ultrafast discharge speed of 11 ns. The results indicate that the glass ceramic can be used in advanced capacitor applications.

Potatoes contain nutrients such as vitamin C, vitamin B6, folic acid, potassium, iron, and magnesium (Ji et al., 2019). With an annual global output of approximately 400 million metric tons, potatoes have become one of the four major global food crops, according to the United Nations Food and Agriculture Organization. They are mainly processed into various products, including frozen or dehydrated potatoes, potato chips, and potato starch (Rady et al., 2015).

A model was developed to predict the impact damage depth of potato. The model consisted of a series of differential equations derived from the force equilibrium on a differential element, which, respectively, governs the relationships among the potato collision displacement and initial collision speed, natural angular frequency of undamped system, and damping ratio. For the collision displacement of potato impact with the rod, the study used the impact test rig and acceleration acquisition system to measure the corresponding values under different experimental conditions. Combined with the determinate experimental data, the mentioned parameters of the model were obtained. According to the model, the obtained maximum value of potato collision displacement was treated as the prediction value of damage depth. The results showed both the experimental values and prediction values of potato damage depth increased with the increment of initial height, and the difference between experimental values and prediction values was less than 8.8%. To evaluate the significant factor of impact damage depth of potato, this study selected the tuber temperature, initial height, tuber mass, and impact material as experiment factors in the orthogonal tests and the order of influencing factors was found to be as follows: initial height > tuber mass > tuber temperature > impact material.