Evading Lyth bound in models of quintessential inflation

Quintessential inflation refers to an attempt to unify inflation and late-time cosmic acceleration using a single scalar field. In this letter we consider two different classes of quintessential inflation, one of which is based upon a Lagrangian with non-canonical kinetic term $k^2(\phi)\partial^\mu \phi \partial_\mu \phi$ and a steep exponential potential while the second class uses the concept of steep brane world inflation. We show that in both cases the Lyth bound can be evaded, despite the large tensor-to-scalar ratio of perturbations. The post-inflationary dynamics is consistent with nucleosynthesis constraint in these cases.Comment: 6 Latex pages, no figures, reference updated and typos corrected, To appear in PL

An application supporting personal and team documentation of students’ design and prototyping processes in FabLab education context

Abstract. Documentation is common practice in an integral part of a modern digital fabrication process while designing a prototype in Fab Lab. DIY and Maker communities are trying to share their documentation through the Fab Lab global networks. Sometimes, the users follow different ways to make their documentation, which has no straightforward interpretation for other users or communities. For designing a complex and original prototype, the users of FabLab often eradicate the challenging phases and forget to document the essential parts of the solutions that occur during the design process. Documentation tools figure out the best possible writing technique(s) that can be shared with the global fab Lab researchers. In designing the prototype, mobility becomes a factor for making the documentation tools more comfortable to the Fab Lab users as well as future researchers. Additionally, the time taken during the documentation process increases during the post-development phase of the prototype. In this work, we have introduced a new and upgraded version of the existing tool called “Protobooth Oulu app”, and expanded different features for documenting while doing the prototype designing technique for consuming less time and ensuring better mobility. This tool also presents and performs the existing guidelines for the Fab Lab Oulu users for creating, managing, and updating personal or team works. Connectivity between an instructor and a team will add useful features for developing the digital fabrication process(s) regarding the documentation practices in Fab Lab Oulu. Different types of scaling and ongoing project feedback are considered the best approach for making the documentation unique and distinguished from other works. Additionally, we also discussed new admin tools for fetching the different scaling data for future data visualization. Post-development in prototype designing research will ensure the advantage of generating and visualizing the data for predicting the analytical result. In this thesis, we also discussed the admin tools and its features for making rational decisions as to the uniqueness of the prototype designs

Women’s empowerment and the commercialisation of African agriculture.

This brief presents a summary of key issues in research on women’s empowerment, drawn from an APRA working paper commissioned to support the design of APRA’s research on pathways to agricultural commercialisation in Africa. In the context of African agriculture, as women move along different pathways of commercialisation, the source of their disempowerment may shift from local to more global actors and factors, and the means of empowerment towards more collective and political processes. Researching the effectiveness of different pathways of agricultural commercialisation to empowering women and girls, therefore, requires an approach which explores the relationships between global and local, shifting dynamics as women move into and up global value chains, and changing gender relations in a specific local context