Results 151 to 160 of about 414,493 (191)
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Intrinsic instability and nonuniformity of plastic deformation
International Journal of Plasticity, 1997In agreement with works of D. C. Drucker and Ming Li in the early 1990s, where it was concluded that plastic deformation is an intrinsically unstable process in initially homogeneous materials that obey a nonassociated flow rule, it is shown here that using the observed small non-normality, the predicted critical hardening modulus for the onset of ...
Li, Ming, Richmond, O.
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Control of intrinsic instability of superelastic deformation
International Journal of Plasticity, 2002zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Slutsker, Julia, Roytburd, Alexander L.
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Intrinsic nonaxisymmetric instabilities in galaxy rings
New Astronomy, 1997Abstract We have investigated numerically the stability and temporal evolution of two-dimensional self-gravitating galaxy rings with flat rotation curves. The initial equilibrium models are composed of a polytropic fluid characterized by various polytropic indices (n = 0.5, 1, 1.5, 3, and 5) and embedded in a rigid scale-free logarithmic potential ...
Dimitris M. Christodoulou +2 more
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Intrinsic instability of nanocrystalline metals
Acta Metallurgica et Materialia, 1992Abstract With a macroscopic analysis, similar to Raj [ Acta metall. 38, 1413 (1990)], premelting at higher order grain junctions, especially at four grain junctions, is discussed. The calculation is applied to nanocrystalline (nc) metals. It is found that nc-metals become unstable at the critical temperature T c . This temperature can be regarded
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Intrinsic instability and entropy stabilization of grain boundaries
Physical Review Letters, 1990A simple method is proposed to describe the thermodynamic properties of disordered grain boundaries in nanocrystalline metals and semiconductors. Based on a free-volume approach at negative pressure of the universal equation of state, the maximum free volume, thermal expansion coefficient, specific-heat capacity, and excess enthalpy, entropy, and free ...
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Intrinsic Instabilities in Homogeneously Broadened Lasers
Topical Meeting on Optical Bistability, 1983Experimental observation has shown that it is no simple matter to make a homogeneously broadened laser operate in a single longitudinal mode. However, elementary theoretical treatments of homogeneously broadening predict that such lasers can operate in only a single mode, because all of the atoms constituting the gain medium experience identical ...
Lloyd W. Hillman +3 more
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Nonlinear effects of the surface-helical instability in intrinsic or nearly intrinsic Ge
Soviet Physics Journal, 1985Results are presented of a numerical calculation of the threshold and nonlinear SHI characteristics in cylindrical germanium specimens. It is shown that in sufficiently thick intrinsic or nearly intrinsic specimens an explosive SHI excitation regime is possible.
G. F. Karavaev, N. L. Chuprikov
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Intrinsic Instabilities of Curved Premixed Flames
Europhysics Letters (EPL), 1993A study of instabilities occurring in downward-propagating curved premixed flames is undertaken, on the basis of a Michelson-Sivashinsky equation including gravity effects. Contrary to the qualitative idea of Zel'dovich et al. on flame stability (Combust. Sci.
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Intrinsic Thermal Instability of Methylammonium Lead Trihalide Perovskite
Advanced Energy Materials, 2015Organolead halide perovskites currently are the new front‐runners as light absorbers in hybrid solar cells, as they combine efficiencies passing already 20% with deposition temperatures below 100 °C and cheap solution‐based fabrication routes. Long‐term stability remains a major obstacle for application on an industrial scale.
Conings Bert +11 more
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Intrinsic Instabilities Of Heavy Metal Fluoride Glasses
Optical Engineering, 1985Heavy metal fluoride glasses (HMFG) are potentially useful as optical components in a wide range of devices. Their utilization has so far been delayed mainly because of insufficient material purity and inadequate processing conditions. However, as the result of numerous research efforts, these problems are gradually diminishing, and it now seems likely
A. J. Bruce +8 more
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