The paramagnetic complex bis(oxazolinylphenyl)amine–Fe(III)Cl2 is investigated by means of solid-state proton NMR at 18.8 T (800 MHz) using magic-angle spinning at 65 kHz. Spin echoes that are excited and refocused by combs of rotor-synchronized pulses in the manner of ‘Delays Alternating with Nutation for Tailored Excitation’ (DANTE) allow one to characterize different chemical environments th...

The geometry of a conventional two-bladed Savonius rotor was used in this study based on report available the literature. A two-dimensional model consisting two buckets and an overlap ratio 0.1 prepared. unsteady Reynolds averaged Navier-Stokes (URANS) equations eddy-viscosity turbulence SST k-ω were employed order to solve fluid motion numerically. Instantaneous velocities pressures calculated...

The segment control of active twist rotor is investigated to evaluate the effectiveness in power reduction. A numerical model for predicting isolated and loads steady level flights deployed validated. parametric sweep amplitude phase angle uniform single-harmonic conducted demonstrate mechanism optimal schedules layouts reduction while considering saturation limits are obtained using an optimiz...

An aircraft engine’s performance depends largely on the compressors’ aerodynamic design, which aims to achieve higher stage pressure, efficiency, and an acceptable stall margin. Existing design methods require substantial prior knowledge different optimization algorithms determine 2D 3D features of blades, in policy needs be more readily systematized. With development artificial intelligence (A...

In order to harness the kinetic energy of marine currents, we propose a novel ocean-current turbine with a horizontal axis. The turbine can be moored to the seabed and function similarly to kites in a water flow. To operate such turbines in a marine current, the resulting rotor torque needs to be canceled. Therefore, the proposed turbine is designed with a float at its top and a counterweight a...

Despite the limitations set by FINA regulations, execution technique in breaststroke swimming is being improved thanks to more and more advanced analyses of the efficiency of the swimmer's movements. The aim of this study was to detect the parameters of the time structure of the cycle correlated with the maximal swimming speed at the of 50 meters distance, in order to focus to specific technica...