Abstract: Personal air transportation on short distances, so-called Urban Air Mobility (UAM), is a trend in modern aviation that raises new challenges as flying in urban areas at low altitudes induces ...

Have you ever heard the phrase “think before you click”? Far too many bad things can happen by simply clicking a link. You could lose money to an online scam, get your identity stolen, or let ...

短链接相比我们的长链接更加的安全：可以保护企业内部资源，保护落地域名等。 短链接对于用户来说用户体验更好，短小 ...

Learn how to join two crochet threads in an ultra safe way using the enhanced flat knot. This quick Crochet School short shows a strong, clean method that keeps your yarn secure and smooth, perfect ...