298 research outputs found
Moisture and Temperature Influence on Biocomposites-to-Timber Bonding
No full textCompatibility and durability are fundamental aspects to take into account when dealing with strengthening and repair of structural components in existing buildings. In particular, timber elements in floors and roofs, like beams and joists, can be improved in their load-bearing capacity by the use of composite (fiber-reinforced) materials. Applied as textiles or laminates, those materials can provide additional tensile strength without weight increase, and are easily applied in situ. Recently, an increasing interest towards the biocomposites (flax, hemp) opened new perspectives: the advantages in comparison with traditional FRPs includes the higher mechanical compatibility and sustainability, especially if glues suitable for wood (e.g., vinyl) are used as matrix, instead of epoxy resins. In the paper, the results of an experimental campaign carried out at the University of Padua, aimed at investigating the influence of humidity and temperature on the adhesion of composite materials (carbon or glass FRP) and biocomposites (flax) reinforcing spruce timber elements are presented. Epoxy resins were used as matrix for all composites; flax was also applied with vinyl glue and considering a protective treatment (alkaline-based). Effectiveness of bond at the interface timber-reinforcement was measured by pull-off tests, and analyzed at microstructural level by optical microscopy and infrared spectroscopy
Experimental Characterization of Timber Floors Strengthened by in-Plane Improvement Techniques
No full textThe rehabilitation of existing timber floors in seismic area should take into account the possibility to use both traditional and more modern materials and techniques. An extensive experimental program carried out at the University of Padova concerned full-scale wooden floors segments strengthened through the application of several solutions, belonging to the following three main categories: planks overlapping, diagonals, and nets.
In detail, the following techniques were considered: single and double planking with an orientation of ±45° having different thicknesses; steel, CFRP, SRP or wooden diagonals; natural fibre (hemp) composites applied as nets with resin or vinyl glue; wooden nets applied with hardwood pins and screws.
The study is aimed at characterizing the behaviour of strengthened floors for the selection of the most suitable solutions applicable in existing buildings, which are able to provide proper in-plane stiffness for seismic load distribution among bearing walls. The test set-up was designed and
realized on purpose to simulate the in-plane shear behaviour of timber floors. The experimental results and the comparison between unreinforced and strengthened floors under monotonic shear load are presented in the paper
Fermat-like equations that are not partition regular
No full textBy means of elementary conditions on coefficients, we isolate a large class of Fermat-like Diophantine equations that are not partition regular, the simplest examples being xn + ym = zk with k â n, m
Sentence comprehension and simulation of objects temporary, canonical and stable affordances
No full textTwo experiments investigate the effects of language comprehension on affordances. Participants read a sentence composed by either an observation or an action verb (Look at / Grasp) followed by an object name. They had to decide whether the visual object following the sentence was the same as the one mentioned in the sentence. Objects graspable with either a precision or a power grip were presented in an orientation affording action (canonical) or not. Action sentences were faster than observation sentences, and power grip objects were faster than precision grip objects. Moreover, faster RTs were obtained when orientation afforded action. Results indicate that the simulation activated during language comprehension leads to the formation of a “motor prototype” of the object. This motor prototype encodes information on temporary/canonical and stable affordances (e.g., orientation, size), which can be possibly referred to different cognitive and neural systems (dorsal, ventral systems)
Centralità e reticolarità metropolitana versus dispersione e contenimento del contagio nel Lazio
No full text
Impact of the global economic crisis on bank loans in agriculture in Italy and in Apulia (2010-2013)
No full textCentralità e reticolarità metropolitana versus dispersione e contenimento del contagio nel Lazio
No full textLatium is characterized by being a region centralized in and around Rome, for many aspects ranging from its political role, to the preponderant number of residents in the capital, to the mobility infrastructure networks (regional, but also national and international), to the high rate of services (administrative, tourist, health, study), to the plurality of economic activities. This concentration is also accompanied by a strong international tourist attraction that produces dynamism and, in times of pandemic, risks arising from global flows and connections. In this context, during the first wave of Covid-19, characterized by low infection rates, the dispersion of cases and low levels of pollution, thanks also to a good number of beds in the intensive care and infectious disease wards, there was no high level of vulnerability, unlike what happened after the summer season
Chromosomal aberration in a young drug-addicted subject and normalization when drug discontinued
No full textA young drug-addict was found to be affected by a chromosomal aberration. A FOLLOW-up study, at 24 30, and 39 mth after the drug had been discontinued, showed a progressive normalization. The amount of drug intake was relatively small, but the family study of the subject indicated the presence of one case of Down's syndrome and of pharmacological allergy
- …
