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Open access

Attila TÓTH and L’ubica FERIANCOVÁ

Abstract

The contemporary Urban Agriculture (UA) is represented by a range of diverse farming typologies taking place in the urban environment. Nowadays, there is an unconventional form of UA called squat farming. The research object of this paper is represented by the case study of Can Masdeu which stands for a squatted and cultivated land at the northern city border of Barcelona. The goal of our Short Term Scientific Mission carried out in the Barcelona Metropolitan Region was to define and study diverse typologies of UA at different levels and scales. One of these types is represented by the ongoing phenomenon of squat farming. Concerning this form, there are two main research questions: 1) How are landscape and urban structures influenced and formed by the activity of land cultivation? and 2) How is the social dimension of squat farming structured – who are the users, what is their motivation, aim and vision? To answer the first research question, we applied spatial and perceptual analyses, and concerning the second research question, the users have been interviewed within discussions and questionnaires. The results include characteristics of spatial and social dimensions of squat farming described on the case study of Can Masdeu.

Open access

J. Svidró, A. Diószegi, L. Tóth and J.T. Svidró

Abstract

Depending on the preparation and the applied materials, moulds and cores can be of high rigidity or can be flexible. Although, chemically bonded moulding materials have relatively good flexibility, their high temperature behaviour determines the dimensional accuracy, the stresses in the castings and can induce several casting defects, such as rattail, veining, etc. The phenomenon is based on two major effects: the thermal expansion of the unbonded foundry sands and the deformation of the sand mixtures. The main objective of the present work was to study the relationship between these two effects, and to improve the knowledge related to the thermo-mechanical interactions between the casting and the mould. Dilatometric analysis of unbonded sand samples were performed and compared to the results of hot distortion tests of moulding mixture specimens. The results showed, that the thermal expansion of foundry sand largely influences the hot distortion behaviour, but depending on the type of binder used.