New Giant Metre-Wave Radio Telescope (GMRT) observations of the five-component pulsar B1857−26 provide detailed insight into its pulse-sequence modulation phenomena for the first time. The outer conal components exhibit a 7.4-rotation period, longitude-stationary modulation. Several lines of evidence indicate a carousel circulation time P̂3 of about 147 stellar rotations, characteristic of a pat...

In this paper, we address the problem of terrain classification using a technically blind hexapod walking robot. The proposed approach is built on top of the existing method based on analysis of the feedback from the robot’s actuators and the desired trajectory. The formed method uses features for the Support Vector Machine classification method that assumes a regular time-invariant gait to con...

In this paper we are concerned with the analysis of special recursive algorithms for traversing the nodes of a planted plane tree (ordered tree ; planar tree) . Some by now classical results in this area are due to KNUTH [7], DE BRUIJN, KNUTH and RICE [1], FLAJOLET [2], FLAJOLET and ODLYZKO [3], FLAJOLET, RAOULT and VUILLEMIN [4], KEMP [6] and others and are summarized in the next few lines : T...

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Current operations of planetary rovers, especially the planning and execution of traverse operations, rely on human analysis and estimation of non-geometric hazards based on images captured by the rover. Despite the use of advanced path planning algorithms capable of avoiding obstacles, this limits daily traverse distances. This paper presents a system concept for planetary rovers capable of sa...