The results of the conducted studies allow us to conclude that an increase in number micelles per unit volume grouting solution will lead its sedimentation stability. desired effect can be achieved by increasing concentrations surfactants mixing fluid or introducing electrolyte. Since presence sites with adsorbed surfactant additive on surface dispersed phase particles significantly changes con...

The objective was to establish imaginative education in analytical skills the history subject at Veintitrés de Octubre Educational Unit of Montecristi canton, Manabí province, Ecuador. To achieve this purpose, a mixed methodological approach applied. First, exploratory research allowed application surveys teachers and students for data collection. Among main findings found, deficient classes ev...

In this study, the surfaces of 316L stainless steel, which is frequently preferred in biomedical applications, were modified with silver nanoparticles (Ag NPs) to improve their antibacterial and anticorrosive properties. Firstly, Ag NPs synthesized using a completely green plant-mediated ultrasound-assisted synthesis method characterized. Next, coated onto surface airbrush spray technique. The ...

Can sat be solved in “moderately exponential” time, i.e., in time p(|F |) 2 for some polynomial p and some constant c < 1, where F is a CNF formula of size |F | over n variables? This challenging question is far from being resolved. In this paper, we relate the question of moderately exponential complexity of sat to the question of moderately exponential complexity of problems defined by existe...

Majority of practical caching algorithms, in particular those used in the World Wide Web applications, are based on the so-called Least-Recently-Used (LRU) cache replacement heuristic whose desirable attributes include low complexity, quick adaptability and high cache hit (low fault) probability. Recent studies have developed asymptotic characterization of the LRU fault probability for the gene...

Several cryptographic schemes and applications are based on functions that are both reasonably efficient to compute and moderately hard to invert, including client puzzles for Denial-of-Service protection, password protection via salted hashes, or recent proof-of-work blockchain systems. Despite their wide use, a definition of this concept has not yet been distilled and formalized explicitly. I...