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排序方式: 共有113条查询结果,搜索用时 31 毫秒
1.
Rasika Prabhu Rasmus Klitkou Grigori A. Medvedev James M. Caruthers 《Journal of Polymer Science.Polymer Physics》2013,51(8):687-697
The linear viscoelastic behavior in dynamic shear and tensile creep at temperatures from −30 to 70 °C is measured for an styrene–butadiene rubber (SBR) elastomer cured with dicumyl peroxide to crosslinking densities between 0 and 23.5 × 10−5 mol/cm3. The G′, G″, and tan δ isotherms are analyzed by time–temperature superposition (TTS), where the tan δ master curves are consistent with those of Mancke and Ferry. However, to achieve the TTS in the lightly crosslinked SBR systems, an anomalous vertical shift is required in the narrow temperature region from 10 to 30 °C. The vertical shift factor in this temperature region is not the standard from rubber elasticity. No anomalous behavior is detected in the equilibrium modulus, which is a linear function of temperature in accordance with the classical theory of rubber elasticity. In contrast to SBR, standard vertical shifts are required to effect TTS for uncrosslinked polybutadiene and an ethylene propylene diene monomer elastomer. © 2013 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys, 2013 相似文献
2.
3.
Grigori Muravskii 《Journal of sound and vibration》2009,319(1-2):476-490
In the paper, the notion of the hysteresis function introduced by the author is developed further and applied in some vibration problems for hysteretic materials. The stress–strain relation is built on the basis of well-known extended Masing's rules in which the scaled backbone curve used in the second rule is replaced by a more general function called the hysteresis function. This modification allows us to regulate the dependence of the damping ratio on the strain amplitude in the process of cycle deforming of a material with further extending to arbitrary deformation processes. The three cases of hysteretic systems are considered: the system with limited stress when strain increases without bound, the system with linear backbone curve, and the system with the backbone curve having increasing stiffness for increasing strain. For a number of dynamic examples, a comparison of different hysteresis functions is carried out. 相似文献
4.
Grigori I. Zhitomirski 《Semigroup Forum》2008,66(1):121-130
A representation of an inverse semigroup by means of partial open homeomorphisms of a topological T
0
-space is called topologically complete if the domains of these partial homeomorphisms form a base of the topology. It is
shown how to construct topologically complete representations on the base of a ternary relation satisfying some elementary
axioms. This result makes it possible to obtain a pseudo-elementary axiomatization for inverse semigroups that have faithful
topologically complete representations in T
1
,T
2
and T
3
-spaces. A topology is introduced on any antigroup; this topology is a concomitant of the algebraic structure and every topologically
complete representation is continuous with respect to this topology. 相似文献
5.
Pawiga Thaweephan Scott Meng Grigori Sigalov Hyun Koo Kim Sung Ho Choi Thein Kyu 《Journal of Polymer Science.Polymer Physics》2001,39(14):1605-1615
Miscibility phase behavior in blends of poly(bromostyrene) with polystyrene (PS) has been investigated by means of time‐resolved light scattering, optical microscopy, and DSC. Cloud point phase diagrams of blends of conventional PS with poly‐(2‐bromostyrene) (P2BrS), poly‐(3‐bromostyrene), and poly‐(4‐bromostyrene) of comparable molecular weights were established by light scattering. Of particular interest is the fact that ortho, meta, and para substitutions in the styrenic aromatic rings of poly(bromostyrene) show profound effects on the composition–temperature phase diagrams of their blends with PS, exhibiting a lower critical‐solution temperature (LCST), an upper critical solution temperature (UCST), and combined LCST/UCST diagrams, respectively. Poly‐(2‐chlorostyrene) exhibits an LCST behavior very close to that of the P2BrS blend, suggesting that these types of halogen atoms may be inconsequential to phase behavior. A similar study has been extended to a PS blend containing commercial brominated PS (66 mol % bromine substitution) to determine what location of bromine substitution is crucial for miscibility enhancement in the flame‐retardant brominated PS blends. © 2001 John Wiley & Sons, Inc. J Polym Sci Part B: Polym Phys 39: 1605–1615, 2001 相似文献
6.
For the eigenvalue problem—λΔu = q(x)u in IRd, with the weight function q changing sign, conditions are discussed for existence of eigenvalues with positive decaying eigenfunctions. 相似文献
7.
Daniel Berend Michael D. Boshernitzan Grigori Kolesnik 《Israel Journal of Mathematics》1995,92(1-3):125-147
Sequences defined by means of polynomials and highly differentiable quasiperiodic functions are considered. It is proved that
under some conditions such sequences must assume small values modulo 1, or even be dense modulo 1. Negative results, demonstrating
that some differentiablity conditions are necessary, are also obtained. 相似文献
8.
Grigori I. Zhitomirski 《Semigroup Forum》2002,66(1):121-130
A representation of an inverse semigroup by means of partial open homeomorphisms of a topological T0-space is called topologically complete if the domains of these partial homeomorphisms form a base of the topology. It is shown how to construct topologically complete representations on the base of a ternary relation satisfying some elementary axioms. This result makes it possible to obtain a pseudo-elementary axiomatization for inverse semigroups that have faithful topologically complete representations in T1, T2 and T3-spaces. A topology is introduced on any antigroup; this topology is a concomitant of the algebraic structure and every topologically complete representation is continuous with respect to this topology. 相似文献
9.
A nonparametric statistical model of small diffusion type is compared with its discretization by a stochastic Euler difference
scheme. It is shown that the discrete and continuous models are asymptotically equivalent in the sense of Le Cam's deficiency
distance for statistical experiments, when the discretization step decreases with the noise intensity ε.
Received: 12 April 1996 / Revised version: 29 October 1997 相似文献
10.