Thermally activated flux creep velocity in Hg0.69Pb0.31Ba2Ca2Cu3O8+δ

1997 ◽  
Vol 282-287 ◽  
pp. 2367-2368 ◽  
Author(s):  
C.C. Lam ◽  
X. Jin ◽  
K.C. Hung ◽  
H.M. Shao
Keyword(s):  
Flux Creep ◽  
Thermally Activated ◽  
Activated Flux ◽  
Creep Velocity

Boundary-value problems in the kinetic theory of gases. Part 2. Thermal creep

1971 ◽  
Vol 45 (4) ◽  
pp. 759-768 ◽  
Author(s):  
M. M. R. Williams
Keyword(s):  
Thermal Conductivity ◽  
Heat Flux ◽  
Temperature Gradient ◽  
Kinetic Theory ◽  
Effective Thermal Conductivity ◽  
Half Space ◽  
Thermal Creep ◽  
Kinetic Theory Of Gases ◽  
Boundary Wall ◽  
Creep Velocity

The effect of a temperature gradient in a gas inclined at an angle to a boundary wall has been investigated. For an infinite half-space of gas it is found that, in addition to the conventional temperature slip problem, the component of the temperature gradient parallel to the wall induces a net mass flow known as thermal creep. We show that the temperature slip and thermal creep effects can be decoupled and treated quite separately.Expressions are obtained for the creep velocity and heat flux, both far from and at the boundary; it is noted that thermal creep tends to reduce the effective thermal conductivity of the medium.

Temporally-ordered CDW creep in pure and doped NbSe3

2002 ◽  
Vol 12 (9) ◽  
pp. 315-315
Author(s):  
K. Cicak ◽  
K. O'Neill ◽  
R. E. Thorne
Keyword(s):  
Charge Density ◽  
Charge Density Wave ◽  
Driving Force ◽  
Functional Form ◽  
Collective Motion ◽  
Density Wave ◽  
Velocity Versus ◽  
Initial Work ◽  
Functional Forms ◽  
Creep Velocity

Below T=40 K, charge-density wave (CDW) transport in NbSe3 is characterized by two well-defined driving force thresholds ET and ET*. Between these thresholds the CDW moves extremely slowly with creep-like temperature and driving force dependencies. At the same time, the CDW exhibits coherent oscillations with a frequency proportional to the CDW current and having very narrow spectral widths, suggesting that the collective motion is temporally ordered. We have extended our initial work to doped crystals containing isoelectronic (Ta) and nonisoelectronic (Ti) impurities, and to crystals of different thicknesses. These experiments show that the qualitative features are extremely robust, and that the functional form of the creep velocity versus driving force and temperature is consistent across all samples for currents ranging over five orders of magnitude. The temperature dependence is consistent with processes having an energy comparable to the CDW gap, but the field and impurity dependencies are inconsistent with all predicted functional forms for creep in CDWs and related systems, and with our earlier picture of amplitude collapse at each impurity. We compare our results to measurements of creep-like behavior in other CDW and SDW systems, and discuss possible mechanisms.

scholarly journals Creep-Velocity Bounds and Glacier-Flow Problems

1967 ◽  
Vol 6 (46) ◽  
pp. 479-488 ◽  
Author(s):  
Andrew C. Palmer
Keyword(s):  
Cross Sections ◽  
Upper And Lower Bounds ◽  
Steady Creep ◽  
Mean Velocity ◽  
Flow Problems ◽  
The Mean ◽  
Hand Calculation ◽  
Glacier Flow ◽  
Rate Relation ◽  
Creep Velocity

Abstract A general result due to Martin can be used to find upper and lower bounds on velocities in steady-creep problems. This method can be applied to glacier flow if ice can be assumed to satisfy a powerlaw stress–strain-rate relation. Bounds on the mean velocity over the glacier cross-section and on the mean velocity on the surface are determined for a particular example (a uniform parabolic channel, with powerlaw exponent 3) and they are shown to bound quite closely the exact solutions due to Nye. Bounds can be found rapidly by hand calculation. The method can be applied to real glacier cross-sections measured in the field.

Computing soil creep velocity using dendrochronology

2016 ◽  
Vol 75 (4) ◽  
pp. 1761-1768 ◽  
Author(s):  
Mohammad Amjad Sabir ◽  
Muhammad Umar ◽  
Muhammad Farooq ◽  
Faridullah Faridullah
Keyword(s):  
Soil Creep ◽  
Creep Velocity

Radiation Effect on the Viscosity of the Simple B2O3 Glasses

1997 ◽  
Vol 504 ◽  
Author(s):  
A. Barbu ◽  
G. Jaskierowicz
Keyword(s):  
Heavy Ions ◽  
Radiation Effect ◽  
Glass Fibers ◽  
Heavy Ion ◽  
High Energy ◽  
High Energy Electron ◽  
Very High Energy ◽  
Radiation Induced ◽  
Very High ◽  
Creep Velocity

ABSTRACTThe creep velocity of B203 glass fibers under irradiation with 2.5 MeV electrons at low flux ( around 5 1013 e-cm−2s−1) has been studied versus temperature. As under very high energy heavy ions irradiation (1.6 GeV argon), the viscosity is drastically reduced below 300°C. An important difference between the two kinds of irradiation is the occurrence of a compaction phenomenon at the beginning of electron irradiation experiments. The results can be understood by assuming two totally different mechanisms: a relaxation driven by melting of the glass along the path of the ions for very high energy heavy ion irradiations and a relaxation driven by individual radiation induced points defects for high energy electron irradiations.

Dimensional crossover characterized by distribution of magnetic domain wall creep velocity

2015 ◽  
Vol 8 (7) ◽  
pp. 073004
Author(s):  
Takuya Taniguchi ◽  
Kab-Jin Kim ◽  
Takayuki Tono ◽  
Sanghoon Kim ◽  
Takahiro Moriyama ◽  
...  
Keyword(s):  
Domain Wall ◽  
Magnetic Domain ◽  
Dimensional Crossover ◽  
Magnetic Domain Wall ◽  
Creep Velocity

An Empirical Constitutive Correlation for Regular Jugged Discontinuity of Rock Surfaces

2013 ◽  
Vol 5 (2) ◽  
pp. 258-268 ◽  
Author(s):  
Bin Yang ◽  
Sihao Mo ◽  
Ping Wu ◽  
Chaoqing He
Keyword(s):  
Deformation Property ◽  
Creep Property ◽  
Shear Stresses ◽  
Test Results ◽  
Creep Tests ◽  
Shear Creep ◽  
Burger Model ◽  
Structural Plane ◽  
Creep Velocity

AbstractThis paper presents a physical investigation and mathematical analysis on mechanical behavior of the regular jugged discontinuity. In particular, we focus on the creep property of structural plane with various slope angles under different normal stress through shear creep tests of structural plane under shear stresses. According to the test results, the shear creep property of structural plane was described and the creep velocity and long-term strength of the structural plane during shear creep were also investigated. An empirical formula is finally established to evaluate shear strength of discontinuity and a modified Burger model was proposed to represent the shear deformation property during creep.

Influence of Wheel/Rail Contact Geometry on Large Amplitude Wheelset Equations of Motion

1981 ◽  
Vol 103 (3) ◽  
pp. 211-218 ◽  
Author(s):  
T. D. Burton
Keyword(s):  
Large Amplitude ◽  
Equations Of Motion ◽  
Vertical Motion ◽  
Contact Geometry ◽  
Constraint Forces ◽  
Velocity Models ◽  
Lateral Creep ◽  
Nonlinear Equations Of Motion ◽  
Normal Constraint ◽  
Creep Velocity

The nonlinear equations of motion and velocities of creep of a simply restrained wheelset on tangent track are derived for the case of large amplitude motion including flange contact. The nonlinearities considered are those arising from the wheel/rail contact geometry. It is shown that during flange contact the lateral creep velocity may differ by as much as 30-40 percent when compared to that calculated using the usual creep velocity models. Furthermore, the use of the equations of rolling and vertical motion as a means of defining the wheel/rail normal constraint forces results in the inclusion in the dynamic model of several effects not usually included. The equations of motion which result for the lateral translation and yaw of the wheelset contain substantially different loadings than those used in most models. The attendant effect on wheelset stability may be significant.

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