نتایج جستجو برای: polyethylene terephthalate
تعداد نتایج: 33049 فیلتر نتایج به سال:
This paper reports the strength behaviour of concrete containing three types of recycled polyethylene terephthalate (PET) aggregate. Results are also analysed to determine the PET-aggregate’s effect on the relationship between the flexural and splitting tensile strengths and compressive strength and to know whether the relationships between compressive strength and other strength characteristic...
Recycling is one of the most efficient methods for environmental friendly waste management. Among municipal wastes, plastics are the most common material that can be easily recycled and polyethylene terephthalate (PET) is one of its major types. PET material is used in consumer goods packaging such as drinking bottles, toiletry containers, food packaging and many more. Usually, a recycling proc...
The kinetics of structural relaxation and crystallization of poly(ethylene terephthalate) (PET) is studied. It is demonstrated that the activation energy depends strongly on fictive temperature Tf . The dependence of the glass transition temperature Tg on the heating rate q + is investigated for samples that were previously cooled down at a rate q = 12.5 K/min. Angell et al [1] compare the ther...
Shape memory properties of PET (polyethylene-terephthalate) foams have been evaluated for two different foam densities. Samples were subjected to multiple memory-recovery cycles along three different directions to measure the effect of foam anisotropy on static mechanical and shape memory properties. The memory cycle was performed by uniaxial compression tests at room temperature. Despite these...
Introduction Polyester is a general name given to the fibers usually made from polyethylene terephthalate having ester functional group in their main chain and formed through the polycondensation reaction of a glycol (or diol) with a difunctional carboxylic acid (or diacid) (Edlund and Albertsson 2003). The presence of two functional groups of each reacting species results in the formation of a...
In this work we propose a photoacoustic model based on the Rosencwaig-Gersho theory to study dyed polymer samples. The model is similar to a two layer system and it is used to obtain the thermal di usivity and the optical absorption coeÆcient of one side dyed polymer foils. The tested sample was the polyethylene terephthalate dyed with disperse dye, the Blue Samarom HGS. The results showed that...
All of the present methods for calibration and monitoring of time-of-flight positron emission tomography (TOF-PET) scanner detectors utilize radioactive isotopes, such as 22Na or 68Ge, which are placed or rotate inside the scanner. In this article, we describe a novel method based on the cosmic rays application to the PET calibration and monitoring methods. The concept allows to overcome many o...
One of the most unexpected findings by functional neuroimaging has been the discovery of the brain's default network - a set of brain regions that is spontaneously active during passive moments. The default network's discovery was a fortunate accident that occurred due to the inclusion of rest control conditions in early PET and functional MRI studies. At first, the network was ignored. Later, ...
Parser Evaluation using Textual Entailments (PETE) is a shared task in the SemEval-2010 Evaluation Exercises on Semantic Evaluation. The task involves recognizing textual entailments based on syntactic information alone. PETE introduces a new parser evaluation scheme that is formalism independent, less prone to annotation error, and focused on semantically relevant distinctions.
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