Open-source resilience: a connected commons-based proposition for urban transformation

In this paper we propose the concept of ‘open-source resilience’ as a promising path towards urban transformation and greater resilience. This proposition is investigated through the process of co-designing a digital platform, providing tools for actors engaging with resilience through urban commoning processes. Such tools will have the role of sustaining commoning projects and scaling them (up and wide) by facilitating processes of knowledge-sharing and networking. To illustrate the approach, we present outcomes and observations from an initial stage of the co-design process, which resulted in a first digital prototype

Influence of parameters of welding regime on metallographic structure of materials from a joint welded in corner in „T” form

To achieve metal constructions with high importance, it can be used different steels, but steel OL 52.4k has a very wide use due to technological properties and mechanical they present. Metallographic structure of materials of a welded joint is influenced by conditions that occur in the process of welding. In the researches there have been studied the influence of parameters of welding regime on the system of metallographic structure of materials from a welded joint in corner in “T” form. There was taken into account welding process MAG using three welding regimes and using steel plates from OL 52.4k steel with a thickness of 10 / mm

Co-producing commons-based resilience: lessons from R-Urban

The co-production of resilience in European urban neighbourhoods is explored based on the experiences from a case study. Within the current ‘resilience imperative’, co-production processes involving multiple stakeholders can be a key factor for increasing cities’ resilience. Co-produced resilience processes are more successful when embedded in collaborative forms of governance such as those associated with urban commons and when fulfilling needed roles with a community. Through the application of the R-Urban approach in a neighbourhood of Colombes (near Paris), the co-production of a commons-based resilience strategy is described. This involved a group of designers as initiators and a number of citizen as stakeholders of a network of civic hubs. The specific strategies involving a participatory setting, collective governance aspects and circular economies are analysed in the light of co-production theories and practices. Internal and external challenges are identified within the implementation process. The nature of conflicts and negotiations in this co-production approach are discussed, and the role of the architects/designers as agents within the process is investigated. Reflections from this example are provided on the limits and promises of this approach and the lessons learned from R-Urban for collaborative civic resilience

Analysis of metallographic structure and hardness of aluminum alloy 3L59 from the structure of vulcanization equipment

The use of aluminum and special alloys of aluminum in the construction of large installations as is the case of vulcanization equipment, cause a substantial reduction in their weight, while increasing the useful capacity used in the joint process. Metallic structure of vulcanization equipment is made of aluminum alloy 3L59, and after a period of use it was found a deterioration of the quality of joints caused by the modification of the properties of the metallic structure from 3L59. The modification of the properties of the metallic structure is determined by the presence of heat in the vulcanization process and in this regard it has been made an analyze of modifications of metallographic structure and hardness which occur in aluminum alloy 3L59

The optimization of welding regime parameters at shielded metal arc welding (SMAW) by mathematical modeling

The realized researches followed the determining of mathematical models that allow the optimization of the welding process in order to obtain welded joints with certain values of the mechanical characteristics. Thus, there were established mathematical models of dependence of mechanical characteristics of welded joints (Rm, Rp02, Z, A, KCV 20°C) of each parameter of welding regime (Iw, Uw), and also, mathematical models that offer cumulative dependence of mechanical characteristics of both parameters of welding regime.The researches have been carried out using steel E 36-4 as base material and as filler material basic electrodes, type E7018 and the applied welding procedure was the process: shielded metal arc welding (SMAW)

Analysis of metallographic structure and hardness of aluminum alloy 3L59 from the structure of vulcanization equipment

The use of aluminum and special alloys of aluminum in the construction of large installations as is the case of vulcanization equipment, cause a substantial reduction in their weight, while increasing the useful capacity used in the joint process. Metallic structure of vulcanization equipment is made of aluminum alloy 3L59, and after a period of use it was found a deterioration of the quality of joints caused by the modification of the properties of the metallic structure from 3L59. The modification of the properties of the metallic structure is determined by the presence of heat in the vulcanization process and in this regard it has been made an analyze of modifications of metallographic structure and hardness which occur in aluminum alloy 3L59

Biomechanically tunable nano-silica/p-hema structural hydrogels for bone scaffolding

Innovative tissue engineering biomimetic hydrogels based on hydrophilic polymers have been investigated for their physical and mechanical properties. 5% to 25% by volume loading PHEMA-nanosilica glassy hybrid samples were equilibrated at 37◦C in aqueous physiological isotonic and hypotonic saline solutions (0.15 and 0.05 M NaCl) simulating two limiting possible compositions of physiological extracellular fluids. The glassy and hydrated hybrid materials were characterized by both dynamo-mechanical properties and equilibrium absorptions in the two physiological-like aqueous solutions. The mechanical and morphological modifications occurring in the samples have been described. The 5% volume nanosilica loading hybrid nanocomposite composition showed mechanical characteristics in the dry and hydrated states that were comparable to those of cortical bone and articular cartilage, respectively, and then chosen for further sorption kinetics characterization. Sorption and swelling kinetics were monitored up to equilibrium. Changes in water activities and osmotic pressures in the water-hybrid systems equilibrated at the two limiting solute molarities of the physiological solutions have been related to the observed anomalous sorption modes using the Flory-Huggins interaction parameter approach. The bulk modulus of the dry and glassy PHEMA-5% nanosilica hybrid at 37◦C has been observed to be comparable with the values of the osmotic pressures generated from the sorption of isotonic and hypotonic solutions. The anomalous sorption modes and swelling rates are coherent with the difference between osmotic swelling pressures and hybrid glassy nano-composite bulk modulus: the lower the differences the higher the swelling rate and equilibrium solution uptakes. Bone tissue engineering benefits of the use of tuneable biomimetic scaffold biomaterials that can be “designed” to act as biocompatible and biomechanically active hybrid interfaces are discussed