Helicopter Fuselage Drag ─ Combined Computational Fluid Dynamics and Experimental Studies

In this paper, wind tunnel experiments are combined with Computational Fluid Dynamics (CFD) aiming to analyze the aerodynamics of realistic fuselage con¦gurations. A development model of the ANSAT aircraft and an early model of the AKTAI light helicopter were employed. Both models were tested at the subsonic wind tunnel of KNRTU-KAI for a range of Reynolds numbers and pitch and yaw angles. The force balance measurements were complemented by particle image velocimetry (PIV) investigations for the cases where the experimental force measurements showed substantial unsteadiness. The CFD results were found to be in fair agreement with the test data and revealed some §ow separation at the rear of the fuselages. Once con¦dence on the CFD method was established, further modi¦cations were introduced to the ANSAT-like fuselage model to demonstrate drag reduction via small shape changes

An Experience in Collecting Requirements for Mobile, Energy Efficient Applications from End Customers in the Bank Sector

Several development processes recommend strongly user participation and involvement in requirement acqui- sition. However, there are very few studies detailing the empirical results of direct user involvement in large industrial software development products. In this paper we report the outcomes of a novel approach taken by the Software House of one of major Russian banks (Ak Bars Bank) on how to improve the development process by directly involving end customers in the requirement elicitation phase of mobile, energy efficient ap- plications. We observe that such involvement in a form of a workshop has led to improvement of requirements collection and higher levels of user satisfactio

Modernization of the russian law: A review of the laws on enforcement proceedings

Modernization of Russian law covers many spheres including enforcement proceedings. The existing legislation on the enforcement proceedings, which has been reformed for last 15 years, serves as basis of modernization. The scientific doctrine and system of enforcement proceedings in Russia have gradually been developed; it includes such fundamental documents as the Constitution of the Russian Federation, international treaties, both substantive and procedural law of the Russian Federation in the area of enforcement proceedings and also court decisions. Furthermore, the importance of the European Court of Human Rights in relation to enforcement proceedings increases in Russia

Laser annealing of metal nanoparticles implanted in dielectrics

The interaction of excimer laser pulses with silica consisting ion-synthesized copper nanoparticles is studied. Using optical reflectance of composite layers it is established that at the initial stage laser annealing leads to the fragmentation of the nanoparticles to smaller ones. After continuous irradiation by several pulses, the nanoparticles become larger due to the heating of the surrounding glass. The laser treatment for a longer time (more than several tens pulses) results in the dissociation of nanoparticles into small clusters and individual atoms. The mechanisms responsible for the modification of the composite material under high power laser radiation are discussed. © 2011 Copyright Society of Photo-Optical Instrumentation Engineers (SPIE)