Browse 163,500+ swirl letters pics stock illustrations and vector graphics available royalty-free, or start a new search to explore more great stock images and vector art.

Choose from 420,290 Flow Background stock illustrations from iStock. Find high-quality royalty-free vector images that you won't find anywhere else.

Light blue is a dreamy, happy color that's perfect for summer. Wear the shade on its own or incorporate it into one of these 20 chic designs.

In this study, a deep sea sound vector field model is established under high-frequency approximation conditions based on ray theory and the Euler formula, focusing on the characteristics of the deep ...

The vector parabolic equation (VPE) method has proven to be a powerful numerical technique for high-fidelity propagation modeling in long guiding structures such as tunnels. However, applying VPE to ...