Temperature Dependence of Conformational Properties of Short Polyelectrolytes from Simulations at a Single Temperature

1994 ◽  
Vol 98 (39) ◽  
pp. 9845-9849 ◽  
Author(s):  
J. Chahine ◽  
M. A. Guimaraes ◽  
F. R. Cavichiolli
Keyword(s):  
Temperature Dependence ◽  
Single Temperature ◽  
Conformational Properties

Conformational Properties of Nickel(II) Octaethylporphyrin in Solution. 1. Resonance Excitation Profiles and Temperature Dependence of Structure-Sensitive Raman Lines

1996 ◽  
Vol 100 (33) ◽  
pp. 14184-14191 ◽  
Author(s):  
Walter Jentzen ◽  
Esko Unger ◽  
Gerasimos Karvounis ◽  
John A. Shelnutt ◽  
Wolfgang Dreybrodt ◽  
...  
Keyword(s):  
Temperature Dependence ◽  
Resonance Excitation ◽  
Structure Sensitive ◽  
Conformational Properties

scholarly journals Modelling the effect of temperature on the probabilistic stress–life fatigue diagram of glass fibre–polymer composites loaded in tension along the fibre direction

2017 ◽  
Vol 52 (2) ◽  
pp. 207-224 ◽  
Author(s):  
Laurent Cormier ◽  
Simon Joncas
Keyword(s):  
Fatigue Life ◽  
Temperature Dependence ◽  
Polymer Composites ◽  
Static Strength ◽  
Fatigue Performance ◽  
Effect Of Temperature ◽  
Model Parameters ◽  
Fibre Direction ◽  
Single Temperature ◽  
Different Temperatures

Predicting the fatigue performance of composites has proven to be a challenge both conceptually, due to the inherent complexity of the phenomenon, and practically, because of the resource-intensive process of fatigue testing. Moreover, mechanical behaviour of polymer matrix composites exhibits a complicated temperature dependence, making the prediction of fatigue performance under different temperatures even more complex and resource intensive. The objective of this paper is to provide a method for the prediction of fatigue life of glass–polymer composites loaded in the fibre direction at various temperatures with minimal experimental efforts. This is achieved by using a static strength degradation approach to fatigue modelling, where only two parameters (including static strength) are temperature dependent, in conjunction with relationships for these two fatigue model parameters temperature dependence. The method relies on fatigue data at a single temperature and simple static tests at different temperatures to predict the effects of temperature on the material’s fatigue behaviour. The model is validated on experimental data for two unidirectional and one woven glass–epoxy composites and is found to accurately predict the effect of temperature on fatigue life of composites. A method to obtain probabilistic stress-life [Formula: see text] fatigue diagrams including temperature effects is also presented.

Temperature dependence of tryptophan and tyrosine luminescence in poly(vinyl alcohol) films

1981 ◽  
Vol 34 (7) ◽  
pp. 1367 ◽  
Author(s):  
R Sakurovs ◽  
KP Ghiggino
Keyword(s):  
Triplet State ◽  
Temperature Dependence ◽  
Vinyl Alcohol ◽  
Kinetic Scheme ◽  
Activation Energies ◽  
Poly Vinyl Alcohol ◽  
Luminescent Probes ◽  
Single Temperature ◽  
Distinct Temperature

The temperature dependence of the fluorescence and phosphorescence from tyrosine and tryptophan in poly(vinyl alcohol) films has been studied over the temperature range 90-295 K. A kinetic scheme is proposed which allows the calculation of activation energies for excited singlet and triplet state deactivation processes. A single temperature-dependent radiationless process from the singlet state is observed for tyrosine and tryptophan, with activation energies of 5.2�0.4 and 7.1�0.6 kJ mol-1 respectively. However, two distinct temperature transitions have been detected for triplet-state relaxation at 180 and 255 K. The role of polymer phase transitions in determining excited state relaxation pathways of embedded luminescent probes is discussed.

Temperature Dependence of the Critical Electron Dose for Fatty Acid Monolayers

1982 ◽  
Vol 40 ◽  
pp. 78-79
Author(s):  
Kenneth H. Downing ◽  
Robert M. Glaeser
Keyword(s):  
Electron Beam ◽  
Fatty Acid ◽  
Inelastic Scattering ◽  
Temperature Dependence ◽  
Structural Damage ◽  
Direct Result ◽  
Second Step ◽  
Strong Temperature Dependence ◽  
Electron Dose ◽  
Covalent Bonds

The structural damage of molecules irradiated by electrons is generally considered to occur in two steps. The direct result of inelastic scattering events is the disruption of covalent bonds. Following changes in bond structure, movement of the constituent atoms produces permanent distortions of the molecules. Since at least the second step should show a strong temperature dependence, it was to be expected that cooling a specimen should extend its lifetime in the electron beam. This result has been found in a large number of experiments, but the degree to which cooling the specimen enhances its resistance to radiation damage has been found to vary widely with specimen types.

Temperature Dependence of Magnetic Domains and Wall Structures

1972 ◽  
Vol 30 ◽  
pp. 496-497
Author(s):  
Sonoko Tsukahara ◽  
Tadami Taoka ◽  
Hisao Nishizawa
Keyword(s):  
Temperature Dependence ◽  
Domain Walls ◽  
Magnetic Domain ◽  
Iron Film ◽  
Objective Lens ◽  
Lorentz Microscopy ◽  
Domain Structures ◽  
Wall Structures ◽  
Crystal Films ◽  
Metallurgical Structure

The high voltage Lorentz microscopy was successfully used to observe changes with temperature; of domain structures and metallurgical structures in an iron film set on the hot stage combined with a goniometer. The microscope used was the JEM-1000 EM which was operated with the objective lens current cut off to eliminate the magnetic field in the specimen position. Single crystal films with an (001) plane were prepared by the epitaxial growth of evaporated iron on a cleaved (001) plane of a rocksalt substrate. They had a uniform thickness from 1000 to 7000 Å.The figure shows the temperature dependence of magnetic domain structure with its corresponding deflection pattern and metallurgical structure observed in a 4500 Å iron film. In general, with increase of temperature, the straight domain walls decrease in their width (at 400°C), curve in an iregular shape (600°C) and then vanish (790°C). The ripple structures with cross-tie walls are observed below the Curie temperature.

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