Naresuan University Journal
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Design of experimental setup to study factors affecting hot spot temperature in disc type winding transformers
No full textMeasurement of residual stress shakedown in pressure/tensile armour wires of flexible pipes by neutron diffraction
No full textThe manufacture of unbonded flexible pipes (flowlines andrisers) involves wrapping steel wires to create pressure andtensile armour layers. The forming of armour wires fromvendor supply conditions to a helix shape on the pipe involvessignificant plastic straining and the wires that are wrapped ontothe pipe are not unloaded. Therefore the armour wires inflexible pipes are expected to contain significant residual stress(RS) as a result of the plastic straining and loading duringmanufacture and placement. This may lead to detrimentaleffects on the strength, durability and the service integrity ofthe pipe. It is postulated that the unfavorable RS introducedduring pipe manufacture reduces due to stress shakedownduring the factory acceptance test (FAT) where the pipe issubjected to a high internal pressure.This paper describes the first attempts to measure RS in thearmour wires in unbonded flexible pipes. The key developmentis the use of a neutron diffraction method which allows themeasurement of RS in-situ on the manufactured pipe throughthe whole wire sections. Pipe samples were prepared exposingthe relevant metal layer and the measurements were performedon pipe samples taken before and after performing thepressurized FAT. The effect of the FAT on the shakedown ofresidual stress in pressure armour wires is discussed. As shownby the measurements, the elastic strains and stresses in thepressure armour wires are much larger in the hoop direction ofthe pipe (i.e. along the length of the wire) than radial or axial tothe pipe. In pre-FAT pipe the hoop stresses are essentiallytensile on the extrados and compressive on the intrados. Theresults have shown that the FAT reduces the hoop strains andstresses to approximately 1/3 of their as manufactured level
Rapid Energy Transfer Enabling Control of Emission Polarization in Perylene-Bisimide Donor-Acceptor Triads
No full textMaterials showing rapid intramolecular energy transfer and polarization switching are of interest for both their fundamental photophysics and potential for use in real-world applications. Here, we report two donor–acceptor–donor triad dyes based on perylene-bisimide subunits, with the long axis of the donors arranged either parallel or perpendicular to that of the central acceptor. We observe rapid energy transfer
The deep fascia of the thigh forms an impenetrable barrier to fluid injected subcutaneously by autoinjectors.
No full textFluid injected from epinephrine auto-injectors into subcutaneous tissue is prevented from penetrating into the muscle by the deep fascia of the thigh. Intra-muscular injection will not occur during firing of an auto-injector if the needle tip is in the subcutaneous tissue
A Proposal for a Three Detector Short-Baseline Neutrino Oscillation Program in the Fermilab Booster Neutrino Beam
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