To shed light on the role of suction in adhesion of microstructure with mushroom-shaped terminal elements, we compared pull-off forces measured at different retraction velocities on structured and smooth surfaces under different pressure conditions. The results obtained allow us to suggest that suction may contribute up to 10 per cent of the pull-off force measured on the structured surfaces at...

Many insect species reversibly adhere to surfaces by combining contact splitting (contact formation via fibrillar contact elements) and wet adhesion (supply of liquid secretion via pores in the insects' feet). Here, we fabricate insect-inspired fibrillar pads for wet adhesion containing continuous pore systems through which liquid is supplied to the contact interfaces. Synergistic interaction o...

the load transfer mechanisms of cable bolts differ from those for normal rebar bolts. the cable bolts used in mines are basically steel strands with different constructions depending on the number of wires or elements and the way they are laid. tendon bolts (rebar and cable) are normally evaluated for their strength and load transfer properties. the tendon strength can be evaluated by the tensi...

This paper describes the 'push-pull' or 'stimulo-deterrent diversionary' strategy in relation to current and potential examples from our own experiences. The push-pull effect is established by exploiting semiochemicals to repel insect pests from the crop ('push') and to attract them into trap crops ('pull'). The systems exemplified here have been developed for subsistence farming in Africa and ...

This paper presents the results of testing adhesion geopolymer coatings and varnishes with ceramic additives to concrete steel substrates. The measurement method used described in this article was pull-off method. test provides an easy way evaluate degree metal surfaces. device values for peel stress, which not only allows a quick determination coating substrate, but also makes it easier compar...

The maximum speed of synchronous circuits is generally constrained by the worst case propagation delay, which limits the system clock frequency. Various techniques exist to manage the circuit delay, trading off speed for other system resources. One such approach is to equalize the rise and fall delay times. The primary design parameter for equalizing these delay times is the ratio between the w...

This study investigates experimentally and analytically the interfacial bond strength of coloured SCC repair layers. Ten mixes with 5%, 10% 15% blue, green or red pigments were produced to examine their fresh properties. Subsequently, 60 specimens tested assess using pull-off push-out tests. The results confirm that reduce mechanical properties its concrete substrates, pigment reducing (by up 4...