According to the principle of acoustic black hole effect, a badminton racket design method embedded one-dimensional structure was proposed. Based on finite element simulation analysis, broadband vibration attenuation characteristics were studied. The results show that this can not only ensure light quality system, but also achieve good reduction effect. In absence damping, small truncation make...

Tumor organoids have great potential as a 3D in vitro system to model cancer. In this work, we studied how the structure of hydrogels based on gelatin with methacryloyl groups (GeIMA) can affect their usage tumor organoids. To end, different levels methacrylation and cellulose nanocrystals (NCC) or reduced graphene oxide (rGO) were prepared used encapsulate human colon carcinoma cells (RKO). Me...

introduction: the aim of this study was to evaluate the amount of dentine removed after canal preparation using stainless steel (ss) hand instruments or rotary profile instruments. materials and methods: thirty-six extracted human teeth with root canal curvatures less than 30º were embedded in clear polyester resin. the roots were cut horizontally at apical 2, 4 and 7 mm. dentin thickness was m...

English main-clause wh-questions form complementiser phrases with wh-words preposed to spec-C position. This is because English wh-words, as verb-complements originally, are strong enough to trigger wh-movement and auxiliary inversion. Persian EFL learners encounter an over-differentiation problem regarding the acquisition of auxiliary inversion rule in English standard questions. Once they hav...