Effects of the spin line temperature profile and melt index of poly(propylene) on melt-electrospinning

2008 ◽  
Vol 49 (2) ◽  
pp. 391-396 ◽  
Author(s):  
C.S. Kong ◽  
K.J. Jo ◽  
N.K. Jo ◽  
H.S. Kim
Keyword(s):  
Temperature Profile ◽  
Melt Index ◽  
Melt Electrospinning ◽  
Poly Propylene ◽  
Line Temperature

Blisk Life Prediction for Twin-Shaft Turbo Engines by Using a Two-Dimensional Thermal Off-Design Model

2010 ◽  
Author(s):  
Ying Chen ◽  
Ashok Koul ◽  
Jun Zhao
Keyword(s):  
Temperature Distribution ◽  
Temperature Profile ◽  
Gas Turbines ◽  
Life Prediction ◽  
Life Cycle Management ◽  
Two Dimensional ◽  
System A ◽  
Crack Initiation Life ◽  
Semi Empirical ◽  
Line Temperature

Understanding the off-design engine behavior is very important for the life cycle management of gas turbines because overhaul interval must be predicted accurately to minimize engine down time and maintenance costs. An off-design thermodynamic model has been developed for twin-shaft engines to obtain mean-line temperature distribution to be used in a prognostics system. A semi-empirical projecting approach was adopted to compute the two-dimensional temperature distribution for the gas path components. This temperature profile was then fed into the structural analysis and damage modeling modules of the prognostics system to predict the fracture critical location and crack initiation life of an A 250 integrally cast bladed disc (blisk). Comparison of the twin shaft model with GasTurb results showed that the model predicts the temperature profile within +/− 8K. The life prediction results from the prognostics system also match closely with the field data.

The analysis of “Gels” in polymer films

1989 ◽  
Vol 47 ◽  
pp. 362-363
Author(s):  
G. M. Brown ◽  
D. F. Brown ◽  
J. H. Butler
Keyword(s):  
Molecular Weight ◽  
Film Industry ◽  
Local Stress ◽  
Melt Index ◽  
Polyethylene Films ◽  
Crosslinked Polymer ◽  
Polymeric Gels ◽  
Mineral Particles ◽  
Polymeric Species ◽  
Special Concern

The term “gel”, in the jargon of the plastics film industry, may refer to any inclusion that produces a visible artifact in a polymeric film. Although they can occur in any plastic product, gels are a principle concern in films where they detract from the cosmetic appearance of the product and may compromise its mechanical strength by acting as local stress concentrators. Many film gels are small spheres or ellipsoids less than one millimeter in diameter whereas other gels are fusiform-shaped and may reach several centimeters in length. The actual composition of gel inclusions may vary from miscellaneous inorganics (i.e. glass and mineral particles) and processing additives to heavily oxidized, charred or crosslinked polymer. The most commonly observed gels contain polymer differing from the bulk of the sample in its melt viscosity, density or molecular weight.Polymeric gels are a special concern in polyethylene films. Over the years and with the examination of a variety of these samples three predominant polymeric species have been observed: density gels which have different crystallinity than the film; melt-index gels in which the molecular weight is different than the film and crosslinked gels which are comprised of crosslinked polyethylene.

Molecular dynamics of poly(propylene) glycol in nanometer confinements

2000 ◽  
Vol 10 (PR7) ◽  
pp. Pr7-271-Pr7-274 ◽  
Author(s):  
A. Schönhals ◽  
H. Goering ◽  
K.-W. Brzezinka ◽  
Ch. Schick
Keyword(s):  
Molecular Dynamics ◽  
Propylene Glycol ◽  
Poly Propylene

ON-LINE TEMPERATURE MEASUREMENT IN A PLASMA REACTOR FOR FULLERENE SYNTHESIS

2003 ◽  
Vol 7 (1) ◽  
pp. 43-49 ◽  
Author(s):  
S. Abanades ◽  
J. M. Badie ◽  
Gilles Flamant ◽  
L. Fulcheri ◽  
J. Gonzales-Aguilar ◽  
...  
Keyword(s):  
Temperature Measurement ◽  
Plasma Reactor ◽  
On Line ◽  
Line Temperature

Control Algorithms for Inductors Movement in Induction Heated Calenders

2012 ◽  
Vol 17 (4) ◽  
pp. 51-57
Author(s):  
Andrzej Frązyk ◽  
Piotr Urbanek ◽  
Jacek Kucharski
Keyword(s):  
Temperature Profile ◽  
Induction Heating ◽  
Control Algorithms ◽  
Uniform Temperature ◽  
Cylinder Axis ◽  
Steel Cylinder ◽  
Modern Technologies ◽  
Temperature Amplitude

Abstract Fixed, placed at regular distances inductors for induction heating of a rotating steel cylinder do not provide sufficiently uniform temperature profile along cylinder axis required by modern technologies,. The article examines the influence of inductors movement along the cylinder axis on the reduction of pick-to- pick temperature amplitude.

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