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Transverse plane

About: Transverse plane is a research topic. Over the lifetime, 17069 publications have been published within this topic receiving 194059 citations. The topic is also known as: axial plane.


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Journal ArticleDOI
TL;DR: Structural evidence is presented that the disorder of the acetic acid of crystallization induces sizable distortion of the Mn(III) sites, giving rise to six different isomers, which leads to an improved simulation of electron paramagnetic resonance spectra and justifies the tunnel splitting distribution derived from the field sweep rate dependence of the hysteresis loops.
Abstract: The problem of the role of transverse fields in Mn12-acetate, a molecular nanomagnet, is still open. We present structural evidences that the disorder of the acetic acid of crystallization indices sizeable distortion of the Mn(III) sites, giving rise to six different isomers, four of them with symmetry lower than tetragonal. Using a ligand field approach the effect of the structure modifications on the second order transverse magnetic anisotropy, forbidden in tetragonal symmetry, has been evaluated. The order of magnitude of the quadratic transverse anisotropies well agree with the values derived by the analysis of the field sweep dependence of the hysteresis loops performed by Mertes et al. ( Phys. Rev. Lett 87, 227205 (2001)) and allows to better simulate the EPR spectra.

124 citations

Journal ArticleDOI
TL;DR: In this article, a surface load normal to a plane connecting the ends of the micro-cracks is used as an approximate representation of contact stresses during frictionless sliding. But the model applied here gives significantly later occurrence of a maximum overall shear stress than that found by using hydrostatic pressure, the present model does predict a maximum in all the cases analyzed.
Abstract: When voids are present in a ductile material subject to a shear dominated stress state under low stress triaxiality the voids collapse to micro-cracks, which subsequently rotate and elongate in the shear field. In the present plane strain analyses for cylindrical voids a surface load normal to a plane connecting the ends of the micro-crack is used as an approximate representation of contact stresses during frictionless sliding. In a previous study of the same problem the author applied hydrostatic pressure inside the nearly closed micro-crack to approximate contact conditions. The transverse surface loads used in the present analyses avoid the tendency to unrealistically elongate the voids. It is found that even though the model applied here gives significantly later occurrence of a maximum overall shear stress than that found by using hydrostatic pressure, the present model does predict a maximum in all the cases analyzed and thus illustrates the micro-mechanism leading to failure of the material by localization of plastic flow.

123 citations

Journal ArticleDOI
TL;DR: In this paper, a model is presented to investigate the driving of coronal turbulence in open field line regions, powered by low-frequency oscillatory field line motions at the coronal base.
Abstract: A model is presented to investigate the driving of coronal turbulence in open field line regions, powered by low-frequency oscillatory field line motions at the coronal base. The model incorporates the combined effects of wave propagation, reflection associated with gradients of Alfven speed, and low-frequency quasi-two-dimensional turbulence, which is treated using a one-point closure phenomenology appropriate to a transverse cascade in the reduced magnetohydrodynamic regime. Considering a sample of the corona and employing open boundary conditions, we use the model to investigate the dynamical efficiency of turbulent dissipation, which competes with propagation of fluctuations away from the coronal base. We examine the dependence of the heating efficiency on wave-forcing frequency, the sensitivity to parameters controlling the Alfven speed profile, the behavior of the model for varying the phenomenological correlation length of turbulence, including asymptotic limits of negligible or very intense nonlinearities, and the confinement of turbulent dissipation to the region near the coronal base. Each of these issues may be of importance in understanding the heating of the corona and the origin of the solar wind.

122 citations

Journal ArticleDOI
TL;DR: In this paper, the authors derived a relation for the ratio of transverse to stream-wise bed-load transport under the influence of gravity from a consideration of the dynamics of saltating grains.
Abstract: Bed-load particles tend to move downslope in response to gravity and downstream in response to fluid drag. The effect of gravity becomes particularly important when the downslope gravitational force has a component normal to the streamwise direction. Such phenomena as bank erosion, bed topography in river bends, sediment sorting, and stream braiding are strongly influenced by transverse bed-load transport under the influence of gravity. Here, the problem is analyzed from a consideration of the dynamics of saltating grains. Simultaneous solution of the streamwise and transverse equations of motion for a grain saltating on a transversely tilting bed of moderate slope allows a determination of mean particle trajectory. This mean trajectory, while predominately directed in the streamwise direction, includes a transverse downslope component as well. The results are used to determine a relation for the ratio of transverse to streamwise bed-load transport. This ratio increases with increasing transverse slope and decreases with increasing streamwise shear stress. The relation is compared with observations as well as existing relations obtained from simpler considerations.

121 citations

Journal ArticleDOI
TL;DR: In this paper, a study of stability properties of perturbations superimposed on an unstably stratified plane parallel flow with variable vertical shear was made, and two different types of instability which may take place in the flow were found: one is a thermal instability modified by a shear flow, and the other is an inertial instability modifying by a thermal stratification.
Abstract: A study is made of stability properties of perturbations superimposed on an unstably stratified plane parallel flow with variable vertical shear. Two different types of instability which may take place in the flow are found: one is a thermal instability modified by a shear flow, and the other is an inertial instability modified by a thermal stratification. Unstable perturbations of the thermal type are distinguished from those of the inertial type in terms of the Richardson number. The thermal instability is most favorable for development of a three-dimensional longitudinal perturbation whose wavelength in the direction parallel to the basic flow is much longer than that in the direction perpendicular to the basic flow. A preferred perturbation of the inertial instability, however, is of a two-dimensional transverse mode. Amplification of transverse perturbations of thermal origin is reduced by the influence of a shear flow regardless of the presence of variable shear in the basic flow. We conclude that a shear flow in general is responsible for the formation of longitudinal convection roll, and a variable shear slightly affects characteristics of thermal instability of a constant shear flow.

120 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20231,178
20222,308
2021385
2020597
2019709
2018654