We report a time-resolved approach to probe the mechanical properties of thin films during drying and solidification based on surface wrinkling. The approach is demonstrated by measuring the modulus of a ternary system comprising an inorganic salt (aluminum chlorohydrate), a humectant (glycerol), and water across the glassy film formation pathway. The topography of mechanically induced wrinklin...

This paper talks about the self-oraganized index maintainance approach of database cracking. It provides fundamental knowledge as well as the description of a basic implementation of database cracking. Alongside multiple cracking algorithms, the implementation also contains the code of a cracking index. By combining these two features the implementation allows the execution of range queries on ...

Nowadays, additive manufacturing (AM) is a powerful way to make complex-shaped components for airspace engineering from nickel-based superalloys. So, while superalloys could easily be we L-DED in sheet-metal thicknesses, they suffered strain-age cracking and solidification during AM or the post-weld aging treatment. This attributed fact that besides limitation of ??- phase forming elements (Al ...

Laser drilling is a well-established process in aerospace industry. However quality and geometry of holes do not get under control in an absolute way. Moreover, drilling understanding is complicated due to the number of parameters and physical phenomena. Laser and matter have some own parameters which are not constant with temperature, and so could not be fitted. In this paper, we describe the ...

Striking differences in the solidification textures of a nickel based alloy owing to changes in laser scanning pattern during additive manufacturing are examined based on theory and experimental data. Understanding and controlling texture are important because it affects mechanical and chemical properties. Solidification texture depends on the local heat flow directions and competitive grain gr...

In this study, the relationship between solidification cracking and epitaxial growth behavior with high-speed laser surface melting of a directionally solidified 247LC superalloys was fundamentally metallurgically investigated, to develop successful welding procedure for next generation gas turbine blades. Under typical conditions (scan speed: 50 mm/s, heat input: 40 J/mm), severe phenomena occ...

Abstract We consider an optimal control problem for a single-spot pulsed laser welding problem. The distribution of thermal energy is described by quasilinear heat equation. Our emphasis on materials which tend to suffer from hot cracking when welded, such as aluminum alloys. A simple precursor the occurrence cracks velocity solidification front. therefore formulate whose objective contains ter...

With the rapid development of internet technologies, social networks, and other related areas, user authentication becomes more and more important to protect the data of the users. Password authentication is one of the widely used methods to achieve authentication for legal users and defense against intruders. There have been many password cracking methods developed during the past years, and p...

Presented work shows the results of DSC measurement for six Sn based solders. The alloys Sn96Ag4, Sn99Cu1, Sn97Cu3, Sn96.5Ag3Cu0.5, Sn95.5Ag3.8Cu0.7 and Sn63Pb37 were studied in the temperature range from room temperature up to 400◦C. The transformation temperatures for melting as well as for solidification were influenced by the composition and thermal history of the alloys. The thermal histor...