102,489 research outputs found
Thermo-mechanical compatibility of CFRP versus steel reinforcement for concrete at high temperature
No full textOptimization of the design of concrete structures has become a driver for the use of nonconventional reinforcing materials. One example of this is the emerging use of non-corrosive, highstrength, and lightweight carbon fibre reinforced polymer (CFRP) prestressing tendons. It is widely known that the bond between FRP reinforcing tendons and concrete deteriorates at elevated temperature due to a combination of factors. Lateral thermal expansion of FRP reinforcing tendons at elevated temperature has been shown to have consequences for the bond performance of these systems. This paper presents the results of an experimental study carried out to assess the occurrence of heat-induced longitudinal splitting cracks in concrete specimens reinforced with CFRP or steel prestressing tendons. A novel testing methodology, namely a Heat-Transfer Rate Inducing System (H-TRIS), is used to subject specimens to thermal loading which replicates that experienced by equivalent specimens in a standard fire resistance test. A comparison between CFRP and steel tendons is made, and the occurrence of longitudinal splitting cracks is evaluated in terms of the time to occurrence and thermal gradient within the concrete. Results are compared against an available analytical model.</p
Robustness and electrical reliability of AZO/Ag/AZO thin film after bending stress
No full textThe increasing interest in thin flexible and bendable devices has led to a strong demand for mechanically robust and electrically reliable transparent electrodes. Indium doped Tin Oxide (ITO) and Aluminium doped Zinc Oxide (AZO) are among the most employed transparent conductive oxides (TCO) and their reliability on flexible substrates have thus received a great attention. However, a high flexibility is usually achieved at very low thickness, which, unfortunately, compromises the electrical conductivity. Here we report the effects of mechanical bending cycles on the electrical and optical properties of ultra thin AZO/Ag/AZO multilayers (45 nm/10 nm/45 nm) and, for comparison, of AZO and ITO single layers whose thickness was, in both cases, 100 nm and 700 nm, deposited at room-temperature on flexible polyethylene naphthalate (PEN) plastic substrates. The electrical stability of the films after several cycles of bending were evaluated by monitoring the relative variation of the electrical resistance with respect to the as prepared sample; the structural damage induced by bending was detected by Scanning Electron Microscopy (SEM). We observed an excellent electrical stability and high flexibility in the AZO/Ag/AZO sample even after 100 cycles, whereas for the single AZO and ITO films the resistivity rapidly increases. The experimental results and numerical simulations provide clear evidences of the key role played by the ductile Ag interlayer that provides improved robustness under mechanical strain
Nero d'Avola. Nota II - Evoluzione dei processi biochimici nel corso dello sviluppo e della maturazione dell’uva
No full textTMJ AND POSTURAL DISORDERS: IMPROVEMENT AFTER USE OF A MICROCHIP
No full textAim. Many patients with TMJ problems have made numerous visits from one physician to another; some
have even been hospitalized by a neurologist and many patients never get correctly diagnosed. Several
studies have identified impairments in postural control in patients with temporomandibular disorders.
There are several methods to alleviate TMD, and some studies have suggested that it is possible to control
the stomatognathic system and the musculoskeletal system through the “foot support”. The aim of the
present study was to evaluate the variation produced by microchip in foot plantar in temporomandibular
and postural disorders
Nero d’Avola- Nota II. Evoluzione dei processi biochimici nel corso della maturazione dell’uva
No full textInfluence of the 12C(α,γ)16O reaction rate on the evolution of a 15MO star. Nuclear Physics A688(2001)249
No full textTemperature dependence of electronic states in (TaSe4)(2)I - Reply
No full textWe reject the assertion of Claessen et al., confirm the validity of our data, and discuss possible causes for the disagreement.LSELPRXEcole polytech fed lausanne,iga,ch-1015 lausanne,switzerland. univ wisconsin,dept phys,madison,wi 53706. Terrasi, A, ECOLE POLYTECH FED LAUSANNE,INST PHYS APPL,CH-1015 LAUSANNE,SWITZERLAND.ISI Document Delivery No.: YH16
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