Anisotropy driven ultrafast nanocluster burrowing

We explore the occurrence of low-energy and low-temperature transient cluster burrowing leading to intact cluster inclusions. In particular, the anomalously fast (ballistic) Pt nanocluster implantation into Al and Ti substrates has been found by molecular dynamics simulations using a tight-binding many-body potential with the 1-5 eV/atom low impact energy. Similar behavior has also been found for many other cluster/substrate couples such as Cu/Al and Ni/Ti, Co/Ti, etc. In particular, in Ni/Ti at already $\sim 0.5$ eV/atom impact energy burrowing takes place. At this few eV/atom low impact energy regime instead of the expected stopping at the surface we find the propagation of the cluster through a thin Al slab as thick as $\sim 50$ $\hbox{\AA}$ with a nearly constant speed ($\propto 1$ eV/atom). Hence the cluster moves far beyond the range of the impact energy which suggests that the mechanism of cluster burrowing can not be explained simply by collisional cascade effects. In the couples with reversed succession (e.g. Ti/Pt, Al/Pt) no burrowing has been found, the clusters remain on the surface (the asymmetry of burrowing). We argue that cluster penetration occurs at few eV/atom impact energy when the cluster/substrate interaction is size-mismatched and mass anisotropic atomically.Comment: 9 pages, 5 figures. submitted to Phys. Rev. B, preprint: http://www.mfa.kfki.hu/~sule/papers/cluster.pd

Regulation of the burning parameters for energetic materials based on ammonium nitrate and metal nanopowders and nonmetals

The results of study for the influence of metallic and nonmetallic nanopowders on the combustion parameters of mixed energetic materials based on ammonium nitrate are presented and compared with materials, containing micropowders of metals. The catalytic activity rank of the powders is plotted showing their effect on the combustion characteristics of mixed energetic materials

Unification of Design Decisions on the Basis of Average Distribution of Probabilities and Introduction of Isolated Areas for Elements of Products Described by Structured Multiple Modules

Analytical approach to the design of technological complexes and preparation of production, taking into account self-organization of database structures and control procedures, is considered; the classification and coding of functional technological modules during their unification, which are the basis for modern methods of digital production preparation, are proposed

Using of 3d-modelling and rapid protoryping technologies during the design of constructions of block-module surface cuttings

The results of the development of constructions of block-modular surface cuttings based on the results of 3D-modeling and rapid prototyping application are introduced

Stiffness of threaded connections in modular boring tools

Modeling of precision treaded connections in SolidWorks. Experiments were carried out to reduce the backlash in threaded connections of boring tools