A new species of Chapelieria was discovered during a recent field trip to the Masoala National Park in eastern Madagascar, and is described here as Chapelieriamagna Kainul., sp. nov. This species is readily distinguishable from previously described species of the genus by its quadrangular shoots, triangular-calyptrate stipules, sessile leaves, pubescent styles, and ridged fruits. It also differ...

In this paper, we consider the texture coding of quadrangular cells which compose active meshes. Active mesh algorithms which have been developed for region based video coding mainly use interpolation techniques to quantize the cell texture. Here, we propose a new quantiztion scheme which associates image warping and an adaptive JPEG scheme. Our approach leads to an interesting trade-off betwee...

The protympanum, a final common pathway between the tympanic cavity and external environment, is gaining relevance due to the ease and completeness of visualization with angled endoscopes. Two primary conformations are described, quadrangular and triangular, and new anatomic structures such as the protiniculum, subtensor recess, and protympanic spine are defined. Surgical relevance of the proty...

Quadrilateral meshes partition algorithm based on cloud data is proposed in the paper. Quadrangular meshes are generated by means of dynamic edges extending according to the types of the nodes. The strategies are set forth on detecting collisions, optimization process, edges process, the second optimization. The new algorithm improves the quality of meshes and increases the efficiency of the al...

Parotocinclus planicauda, a new species from a tributary of the Doce River drainage in Minas Gerais State, Brazil, is distinguished from all other species of the genus by the presence of a caudal peduncle almost quadrangular in cross section; the anterior position of the adipose fin, close to the dorsal fin insertion; and very small orbits. A key to the Parotocinclus species of eastern Brazilia...

Pose estimation is an important operation for many robotic tasks such as camera calibration and landmark tracking. In this paper, we propose a new algorithm of pose estimation based on the volume measurement of tetrahedra composed of feature-point triplets extracted from an arba’trmy quadrangular target and the lenscenter of the vision system. This method has been tested using synthetic and rea...