13,364 research outputs found
Thermo-mechanical analysis of carbon nanotube based functionally graded Timoshenko beam
This analytical work deals with prediction of the stresses developed in a Functionally Graded Timoshenko Beam that has been reinforced with Carbon Nanotubes (CNTs), which is subjected to thermal and mechanical loads. High temperatures have been applied to the upper and lower surfaces of the beam with a certain temperature difference between the two layers for the formation of a temperature gradient. The physical properties of the constituent elements of the beam material vary with temperature and further a variation in temperature leads to development of stresses in a beam. The constituent materials are alumina as the ceramic material, as well as the matrix material, of the functionally graded beam and single walled CNTs as the reinforcement material. Further the physical properties of the beam would vary along the thickness direction according to the volume fraction of the constituents of the beam. In this analysis the volumetric fraction varies according to power law. Temperature-dependent and temperature-independent material properties were obtained layer wise by dividing the entire thickness of the beam into ten layers. Thermal stresses were obtained using temperature-dependent and temperature-independent material properties for each layer for different slenderness ratios and compared
Probing new physics in decays by using angular asymmetries
We present the fully general, model independent study of a few rare
semileptonic decays that get dominant contributions from -annihilation
and -exchange diagrams, in particular ,
where . We consider the most general Lagrangian for the decay,
and define three angular asymmetries in the Gottfried-Jackson frame, which are
sensitive to new physics. We show how these angular asymmetries can be easily
extracted from the distribution of events in the Dalitz plot for decays. Especially a non-zero forward-backward asymmetry within
the frame would give the very first hint of possible new physics. These
observations are also true for related decay modes, such as and . Moreover, these asymmetry signatures
are not affected by either - or - mixings.
Then, this implies that both and as well as their CP conjugate modes can all be considered
together in our search for signature of new physics. Hence, it would be of
great importance to look for and study these decays in the laboratory, LHCb and
Belle II in particular.Comment: 5 pages, 2 figure
Effect of both Z and Z'-mediated flavor-changing neutral currents on the baryonic rare decay decays into
We study the effect of both Z and Z'-mediated flavor-changing neutral
currents (FCNCs) on the rare
decay. We find the branching ratio is reasonably enhanced from its standard
model value due to the effect of both Z and Z'-mediated FCNCs, and gives the
possibility of new physics beyond the standard model. The contribution of
Z'-boson depends upon the precise value of the mass of Z' boson.Comment: 14 page
- …