Trust,choice, and self-preservation: a computational approach

Cognition, Technology & Work - Trust tends to be described through the lens of a rational choice of a trustor driven by the trustworthiness of a trustee. This, however, does not exhaust...     

The use of Fuzzy rule-based systems in the design process of the metallic products on example of microstructure evolution prediction

Journal of Intelligent Manufacturing - The challenge on the contemporary market of consumer goods is a quick response to customer needs. It entails time restrictions, which a semi-finished...     

Modeling and evaluating beat gestures for social robots

Multimedia Tools and Applications - Natural gestures are a desirable feature for a humanoid robot, as they are presumed to elicit a more comfortable interaction in people. With this aim in mind, we...     

The Scavenging Effect of Different Rare-Earth Elements in the Low-Purity Zr50Cu40Al10 Alloy

Metallurgical and Materials Transactions A - Glass-forming alloys are very sensitive to oxygen contaminations. Here, the oxygen-scavenging effect of five rare-earth elements (REEs) was studied when...     

Optimal design of vibration-isolation systems by means of a numerical simulation

Journal of Mechanical Science and Technology - In this paper the computational methodology for evaluating vibro-isolation properties of the vibration reduction systems is discussed. The proposed...     

Tone-Based Contention Resolution for Multi-hop Wireless Sensor Networks

Wireless Personal Communications - Medium access control protocols with common active period (AP MACs) are frequently used in wireless sensor networks (WSNs) with medium-load traffic requirements....     

Application of RES methods for computation of hydrodynamic flows by an example of a 2D flow past a circular cylinder for Re = 5-200

An effective method of simulation of multidimensional hydrodynamic problems for small Mach numbers is described. The method is based on utilization of FFT (fast Fourier transform) for solving the Poisson equation on a rectangular grid in domains with complicated geometry (particularly multi-linked). Simulation was performed with zero numerical viscosity. The speed of calculation of the Poisson equation is 1-2 orders of magnitude higher compared to that of the calculation based on standard iteration techniques. Systematic simulations of a 2D flow past a cylinder in the channel with permeable and impermeable boundaries were performed. The critical values of the Re number of the onset of vortex movement (Re₀) and loss of stability of steady (Re₁) and two-dimensional movement (Re₂) are estimated with high accuracy for the two cases mentioned.     

The determination of the elastic properties of an anisotropic polycrystalline graphite using neutron diffraction and ultrasonic measurements

The elastic properties of an extruded graphite (GR-280) used in nuclear industry have been examined. The lattice preferred orientation was determined by time-of-flight neutron diffraction that revealed weak texture with a texture index of less than 1.2. The bulk elastic properties of polycrystalline graphite with such a texture have been calculated using various averaging methods and compared with the properties obtained from the measurements of the longitudinal sound velocities, performed using special equipment at different hydrostatic pressures up to 150 MPa. The static elastic modulus of the GR-280 graphite as well as the diffraction elastic modulus was measured in situ by high resolution neutron diffraction by observing the shift of the (0 0 2) Bragg reflection under uniaxial loads up to 20 MPa. The static elastic moduli of two pyrolytic graphites have also been measured for comparison. It was shown that the anisotropy of the elastic properties of reactor graphite GR-280 is due to the crystallographic texture formed during the extrusion process, but the internal pores and microcracks are not closed even at a pressure of 150 MPa and they greatly influence the exact values of the bulk elastic moduli of graphite.     

Fuelling of aircraft radial piston engines by ES95 and 100LL gasoline

The cost of maintaining aeroplanes is still considerable. It concerns especially operation cost where fuel is a substantial part. At the moment the special 100LL gasoline is used to fuel aircraft piston engines. It is about 20% more expensive than ES95 gasoline featuring comparable properties.The article shows the results of test-bed research conducted on the radial piston aircraft engine fuelled by aircraft 100LL gasoline and automotive ES95 gasoline. The object of research was ASz-62IR engine by WSK PZL-Kalisz that was equipped with an experimental fuel injection system. Power, fuel consumption, head temperatures and indicated pressure in cylinders were analysed in the selected typical operating points. The testing was carried out in steady state. It was proved that it is possible to exchange fuels with no engine power loss and merely an insignificant increase of fuel consumption but with significant increase of IMEP cycle-to-cycle variation.