In this study, the effects of heat treatment of aluminum alloy on the tube bending process were investigated in the rotary draw bending process. As two experimental and numerical simulation methods were used to determine the wall-thinning, ovality, and spring back for extruded, annealed, and aged AA6063 aluminum alloy tubes in different bending angles and bend radii. Numerical simulations were ...

The insect integument displays uniform posterior orientation of cuticular denticles or bristles formed by the epidermal cells. We want to understand how cell polarities become uniformly oriented in the plane of the epidermal sheet. Here we test whether directed cell migration disturbs the orientation of denticles. Burning a circular area of epidermal cells beneath the cuticle causes cells to mi...

In this article we present and test a model for large microring resonators based on implementation of the bidirectional Eigenmode Expansion Method for rigorous modelling of vectorial field propagation in the coupling region and using accurate solutions for the bend mode propagating in the ring.

We consider theoretically a system of exciton-polariton micropillars arranged in honeycomb lattice. The naturally present TE-TM splitting and an alternating Zeeman splitting, where the different sublattices experience opposite shifts Dirac points energy, giving rise to antichiral behavior. In strip geometry having zigzag edges, two pairs edge states exist propagate same direction (including at ...

A BIST (Built-In Self-Test) methodology that uses the circular BIST technique to perform a random test of sequential logic circuits is presented. The fault coverage obtained using this technique is supplemented by deterministic tests that are presented to the CUT (Circuit Under Test) by configuring the circular path as a partial scan chain. A CAD (Computer-Aided Design) tool for automating this...

F my house in Fairbanks, Alaska, I see Mt. McKinley 250 km to the southwest. One hundred fifty kilometers to the south is Mt. Hayes, and 200 km to the southeast is Mt. Hadjukovich. But in the winter it is often hard to know what these Alaska Range mountains really look like. They appear as mirages, distorted into towering images, squashed images, inverted images, or floating images (see Figs. 1...

In this paper we consider (hierarchical, Lagrange) reduced basis approximation and a posteriori error estimation for potential flows in affinely parametrized geometries. We review the essential ingredients: i) a Galerkin projection onto a lowdimensional space associated with a smooth “parametric manifold” in order to get a dimension reduction; ii) an efficient and effective greedy sampling meth...

In this paper, a numerical scheme for a generalized planar Ginzburg-Landau energy in a circular geometry is studied. A spectral-Galerkin method is utilized, and a stability analysis and an error estimate for the scheme are presented. It is shown that the scheme is unconditionally stable. We present numerical simulation results that have been obtained by using the scheme with various sets of bou...

The Escherichia coli melR gene encodes MelR protein which is a member of the AraC/XylS family of bacterial transcription activators. The function of MelR was investigated by making a targeted deletion in the melR gene of the Escherichia coli chromosome. MelR is a transcription activator essential for melibiose- dependent expression of the melAB operon which is needed for bacterial growth with m...