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Acoustical signals of free-ranging Presbytis entellus were analyzed with the aid of sonagrams. Tape-recordings were from two ecologicallydifferent habitats in North India, the Kumaon Hills on the southern slope of the Himalayas and the plains habitat of Rajasthan. The acoustical quality and the spectrographic structure of the signals are described and their communicative functions within the social context discussed. We found significant differences in the acoustical repertoire of the langurs of the two habitats both in the tone quality and the spectrographical structure of single signals serving the same functions in both regions and in functional deviations of identically or similarly structured vocalizations. Some of these differences appear to be phylogenetic adaptations to the different environmental conditions of the habitats or to be related to special types of social organization in the two separate langur populations.

This paper presents the application of a novel projection-based safety system for ensuring hard safety in human-robot collaboration. We adapted the proposed sensor system to incorporate the joint positions and velocities of a collaborative robot, thus offering the opportunity to establish minimal and well-shaped safety spaces around the robot at any time. In this contribution we explain in detail main challenges and their solutions for generating and monitoring such safety spaces. Furthermore, we build up a future collaborative workplace to demonstrate the practicability of the system under operational conditions

Clinching continuous fibre reinforced thermoplastic composites and metals is challenging due to the low ductility of the composite material. Therefore, a number of novel clinching technologies has been developed specifically for these material combinations. A systematic overview of these advanced clinching methods is given in the present paper. With a focus on process design, three selected clinching methods suitable for different joining tasks are described in detail. The clinching processes including equipment and tools, observed process phenomena and the resultant material structure are compared. Process phenomena during joining are explained in general and compared using computed tomography and micrograph images for each process. In addition the load bearing behaviour and the corresponding failure mechanisms are investigated by means of single-lap shear tests. Finally, the new joining technologies are discussed regarding application relevant criteria.

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