We construct an Alexander-type invariant for oriented doodles from a deformation of the Tits representation twin group and Chebyshev polynomials second kind. Like Alexander polynomial, our vanishes on unlinked with more than one component. also include values several doodles.

Ultrasound has revolutioned the care of women carring twins. First trimester evaluation is the best time to determine chorioniocity and amnioniocity in multiple gestations. First trimester diagnosis is based on the number of gestational sacs, amnions and yolk sacs. Growth rate in multiple multiple gestations during the fist and early second trimesters parallels the growth rate of singleton preg...

Detwinning is an important plastic deformation mechanism that can significantly affect the mechanical properties of twin-structured metals. Although many detwinning mechanisms have been proposed for pure metals, it unclear whether such a model valid nanocrystalline alloys because lack direct evidence. Here, atomicscale process AuAg alloy with average grain size ∼15 nm was investigated in situ. ...

The single-pass rolling test was carried out on AZ31 magnesium alloy sheet with a thickness of 1.3mm at room temperature and heated to 350°C different reduction rates. microstructure mechanical properties were contrastively analyzed, the nucleation process twinning dynamic recrystallization analyzed. results showed that twin main mechanism coordinate large deformation increase rate, grain bound...

Articles you may be interested in The study of the mechanical properties of Au films by nanoindentation techniques AIP Conf. High magnetic field annealing effect on visible photoluminescence enhancement of TiO2 nanotube arrays Appl. Magnetic and mechanical properties of rolled-up Au/Co/Au nanomembranes with multiple windings Direct observation of twin deformation in YBa2Cu3O7− x thin films by i...

Deformation twinning is necessary for achieving strain in plastically hard directions magnesium alloys under ambient conditions, but can also contribute to void formation and crack propagation that lead early failure. This especially true instances of twin transmission between grains, which result longer continuous boundaries higher volume fractions. Coarse grain boundary particles have the pot...