Kinematic Consistency Research Articles

Kinematic consistency of the magnetic excitations in 'easy-plane' ferromagnets

Extending to easy-plane ferromagnets the approach developed in a previous paper (Balucani et al., 1979), the kinematic inconsistencies of the Hartree-Fock temperature-dependent magnon energies are removed. To restore this consistency at the lowest order in the anisotropy a second-order theory is worked out and the leading terms in the self-energy are taken into account.

Kinematic consistency in anisotropic ferromagnets

The kinematic inconsistencies for the Hartree-Fock magnon energy renormalisation in a ferromagnet with uniaxial anisotropy are shown to be eliminated by taking into account additional anisotropy terms present in the second-order self-energy.

Relativistic corrections in the theory of expanding synchrotron sources

view Abstract Citations (5) References (11) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Relativistic corrections in the theory of expanding synchrotron sources. Salvati, M. Abstract Two spherically symmetric models for relativistically expanding radio sources were examined: the filled-center canonical model and a shell model with constant absolute thickness. Analytical expressions are obtained for characteristic dynamical and electrodynamical quantities with no restriction on surface velocity, and the errors ensuing from a classical analysis of a given data set are estimated. Available data on the low-frequency variables CTA 102, 3C 454.3, and BL Lac are discussed in order to distinguish between the filled-center and shell models, discern evidence for or against Compton-limited source fueling, and evaluate the kinematical and dynamical consistency of the models. Comparison with the data shows that these low-frequency variables severely strain even the shell model, which is more favorable than the canonical model. Publication: The Astrophysical Journal Pub Date: October 1979 DOI: 10.1086/157360 Bibcode: 1979ApJ...233...11S Keywords: Radio Sources (Astronomy); Relativistic Theory; Stellar Models; Synchrotron Radiation; Variable Stars; Compton Effect; Correction; Quantum Electrodynamics; Radio Astronomy; Relativistic Effects; Relativity; Shell Theory; Astrophysics; Radio Sources:Expansion; Radio Sources:Relativity; Radio Sources:Synchrotron Radiation; Radio Sources:Variations full text sources ADS |

A tomographic comparison of the temporomandibular joint in the hypo- and hyperdivergent patient

Introduction: The notion that chewing cycle shape and cycle dynamics differ between subjects with and without malocclusion is largely based on qualitative studies that combined various types of malocclusion. The purpose of this prospective study was to determine whether chewing cycle kinematics of untreated young adults with deepbite malocclusion differ from those with normal occlusion. Methods: Twenty-three deepbite subjects (>50% overbite) and 24 controls with normal occlusion chewed gum (right side only) while their jaw movements were recorded at 100 Hz by using an optoelectric jaw tracking system. Results: Differences in cycle duration between deepbite and control subjects were small and not significant (P >.05). The deepbite subjects showed significantly (P <.05) less maximum inferior excursion (7.7 vs 9.0 mm) and significantly greater maximum posterior excursion (5.1 vs 4.0 mm) than subjects with normal occlusion. In addition, the deepbite subjects had significantly smaller maximum vertical velocities than subjects with normal occlusion (49.2 vs 60.8 mm per second). Deepbite subjects also showed significantly (P <.05) less cycle-to-cycle variability in maximum velocities and excursions to the balancing side but significantly (P <.05) greater variability in cycle duration and maximum posterior excursions. Conclusions: A deepbite malocclusion alters the shape of chewing cycles and the consistency of chewing cycle kinematics.

Selfconsistently renormalized spin-wave approximation for some two-dimensional magnetic systems

Some temperature-dependent properties of two-dimensional magnetic hamiltonians with uniaxial anisotropy are studied on the basis of the selfconsistently renormalized (SCR) spin-wave approximation. Due to the importance of anisotropy in two- dimensional systems, particular attention is paid to the kinematical consistency of the theory by considering multiple scattering due to anisotropy. In particular the properties of FeCl2, a layer ferromagnet with large single-ion and exchange anisotropy, and K2NiF4, a layer antiferromagnet with small anisotropy have been studied. In both cases good agreement with experiments is found for temperature renormalization of small k spin-wave energies. Improved results with respect to spin-wave theory are obtained for the order parameter. The large k dependence in the temperature renormalization of spin-wave energies is predicted for antiferromagnets with medium and small anisotropy.

On one-dimensional finite-strain beam theory: The plane problem

The paper formulates a one-dimensional large-strain beam theory for plane deformations of plane beams, with rigorous consistency of dynamics and kinematics via application of the principle of virtual work. This formulation is complemented by considerations on how to obtain constitutive equations, and applied to the problem of buckling of circular rings, including the effects of axial normal strain and transverse shearing strain.