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

Comparative analysis of 3D printers based on FDM and SLA technologies

This article describes the process of intellectualization of the fiber-optic sensor (FOS) system. The block diagram of the intelligent system is shown. The modeling of the flowchart of FOS intellectualization in the LabVIEW program is shown

Comparative analysis of 3D printers based on FDM and SLA technologies

This article describes the process of intellectualization of the fiber-optic sensor (FOS) system. The block diagram of the intelligent system is shown. The modeling of the flowchart of FOS intellectualization in the LabVIEW program is shown

Merhume

Celal Nuri'nin Ati/İleri'de tefrika edilen Merhume adlı roman

Gizli el

Reşat Nuri'nin Dersaadet'te yayımlanan Gizli El adlı romanının ilk ve son tefrikalarıTelif hakları nedeniyle romanın tam metni verilememiştir

Оценка производственной технологичности конструкции в жизненном цикле изделия

On the basis of technical and economic analysis of the properties of relations between design and technological solutions, a method for the integral assessment of production manufacturability by combining individual manufacturability coefficients at different stages of the product life cycle is suggested. Separate coefficients take into account the influence degree of various constituent stages on the labor intensity of production and maintenance, repair and disposal of the product structure. Design and technological solutions in design systems imply the use of properties such as reflexivity, symmetry and transitivity. As a result, it is proposed to understand the properties set of the product design that determine its adaptability to achieve optimal costs in production and disposal for specified quality indicators and work conditions. A list of manufacturability coefficients of manufacturing a product design has been determined, including coefficients of purchase, repeatability of details and connections, material hardness, borrowing, typing, precision, roughness, mass. An examination of the effectiveness assessment the use tools, equipment and other objects of the technological environment at the stages design and technological production preparation is formalized. The examination includes an analysis of the frequency and duration of the meeting of structural parts elements and the tools state at the stages of their manufacture, operation and disposal.На основе технико-экономического анализа свойств отношений конструкторско-технологических решений предложен метод интегральной оценки производственной технологичности путем объединения отдельных коэффициентов технологичности на различных этапах жизненного цикла изделия. Отдельные коэффициенты учитывают степень влияния различных составляющих этапов на трудоемкость производства и обслуживания, ремонта и утилизации конструкции изделия. Конструкторско-технологические решения в системах проектирования предполагают использование таких свойств, как рефлексивность, симметричность и транзитивность. В результате предложено под производственной технологичностью понимать совокупность свойств конструкции изделия, определяющих ее приспособленность к достижению оптимальных затрат при производстве и утилизации для заданных показателей качества и условий выполнения работ. Определен перечень коэффициентов технологичности изготовления конструкции изделия, включающий коэффициенты покупаемости, повторяемости деталей и соединений, твердости материала, заимствования, типизации, точности, шероховатости, массы. Формализована экспертиза оценки эффективности применения инструментов, средств оснащения и других объектов технологической среды на стадиях конструкторской и технологической подготовки производства. Экспертиза включает анализ частоты и продолжительности встречи конструктивных элементов деталей и состояния инструментов на этапах их изготовления, эксплуатации и утилизации