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This paper aims to discuss, analyze and compare members of a group of actuators with adjustable stiffness, namely: AwAS, AwAS-II and CompACT variable stiffness actuator (VSA) developed at Italian Institute of Technology (IIT).

These actuators are among series type of VSAs where one main motor is dedicated for link positioning and a secondary motor, in series with the first one, regulates the output link stiffness. Regulating the stiffness in this group of actuators is based on the lever concept. Initially, springs were moved along the lever to tune the stiffness while in the later versions stiffness was regulated through relocating pivot point along the lever.

This paper discusses how different mechanisms have been employed in realization of the lever concept in these actuators and what are the advantages and disadvantages of each realization.

Today’s robots are not supposed to be solid, isolated and rigid anymore but rather adaptive, cooperative and compliant entities in our daily life. The new attitudes demand for novel technologies substantially different from those developed for industrial domains both at the hardware and the software levels. This work presents latest three state-of-the-art actuators, developed at IIT, which are great answers to the needs of tomorrow’s robot.

These novel actuators are really ready for commercial exploitation, as they are compact and reliable. The main novelty is based on employing concept of lever mechanism for stiffness regulation. They have been designed and manufactured in a very professional and optimized way.

This chapter explains how SYRIZA managed to build international support up to the January 2015 election with very limited resources, and against mainstream coverage, by relying essentially on grassroots movements and social media. It also shows how, approaching to power, SYRIZA's political, but also communication strategy, became more institutionalised and relied less on grassroots campaigning. Methodologically, our research is based on the following research techniques: First, interviews with activists and members of the party as well as observations inside its social media team. Second, the study of online content and data from 2006 to 2015. Overall, this chapter shows that SYRIZA's campaign on the Internet relied mainly on alternative media activists who acquired a specific savoir faire and developed international networks during the intense antiausterity social movement that took place in Greece between 2010 and 2013. The campaign was also supported by young experts from the private sector that contributed on a voluntary basis. Nevertheless, its success was mainly due to the European political context and the opportunities it offered to the radical Left, rather than the communication strategy, which in any case suffered from a lack of means and from a somewhat chaotic (non) organisation.