Atomistic simulation of primary microstructure formation in metals during crystallization from the melt.

Additive manufacturing of metallic parts by Selective Laser Melting (SLM) implies high temperature gradients and small volume of the melt bath. These conditions make the process scales close to those available for state-of-the-art massively parallel atomistic simulations. In the paper, the microscopic mechanisms responsible for the formation of primary microstructure during molten metal solidification are investigated using classical molecular dynamics (CMD).

Effect of laser-induced ultrasound treatment on material structure in laser surface treatment for selective laser melting applications.

A new mechanism for controlling the microstructure of products in manufacturing processes based on selective laser melting is proposed. The mechanism relies on generation of high-intensity ultrasonic waves in the melt pool by complex intensity-modulated laser irradiation. The experimental study and numerical modeling suggest that this control mechanism is technically feasible and can be effectively integrated into the design of modern selective laser melting machines.

Experimental Biointegration of a Titanium Implant in Delayed Mandibular Reconstruction.

: Mandibular reconstruction, after extensive resection of the mandible for the treatment of oral cancer, is a well-known procedure, however, relatively little is known about bone integration into the titanium implant after reconstruction with a temporary plastic implant. The main goal of this experimental study was to study the process of osseous integration into the titanium implant in an in vivo experiment following prior mandibular reconstruction with a temporary plastic implant. : Four ewes initially underwent a partial one-sided resection of the mandible, with the formation of an approximately 3 × 1 cm defect.

[Thermodynamic characteristics of the gating mechanisms of fast potassium channels of somatic membranes of snail neurons].

The fast potassium current conductance was treated as a system obeying n3 kinetics. The steady-state arrangement of the gating charges have been analyzed in terms of a Boltzmann distribution with two allowed configurations. Rate equations were obtained using the transition rate theory and assuming that each reaction was rate limited by only one energy barrier.

[Reactions of the directionally sensitive optical interneurons of insects to movement of a two-dimensional pattern].

The reactions to movements of two-dimensional patterns with the same average spatial period were compared in electrophysiological experiments. Directionally-sensitive neurons in connectives of dragonflies (fam. Libellulidae) were 1.