The broadcast automatic dependent surveillance (ADS-B) system is a new-generation air traffic control designed to avoid the waste of resources in secondary radars. establishment spaceborne ADS-B provides broad prospect for ionospheric tomography. In this paper, external observation information ionosphere obtained by measuring Faraday rotation angle, that is, total electron content (TEC). Tomogr...

dermatofibrosarcoma protuberans is an uncommon malignant mesenchymal tumor of the dermis, which most commonly appears on the body and extremities. a preoperative diagnosis of dermatofibrosarcoma protuberans is extremely difficult, because it is a very rare entity and its appearance is often similar to that of benign breast lesion. here, we presented a case of breast dermatofibrosarcoma protuber...