An extension of the FastICA algorithm is proposed for the blind separation of both Q-proper and Q-improper quaternionvalued signals. This is achieved by maximising a negentropy-based cost function, and is implemented using the Newton method in the augmented quaternion statistics framework. It is shown that the use of augmented statistics and the associated widely linear modeling provide theoret...

Purpose : to study the correlation between acoustic and morphometric parameters of optic nerve (ON) anthropometric data in healthy young people. Material methods . The research involved 24 volunteers (48 eyes), including 9 men 15 women, average age was 25.0 ± 1.9 years. Anthropometry included measurements height, weight, body mass index (BMI). Ultrasound examination retrobulbar part ON measurem...

A rational design of economically cost-effective chemical libraries as well as successful data mining during a process of drug discovery employs a vast array of the molecular descriptors. Despite the huge importance of this area of the research there is still a need for the further development of the simple, intuitive, easily calculable, specific and size-invariant parameters of the molecular s...

Technology of round bars rolling on a three-high skew rolling mills allows rolling of standard materials such as steel and aluminum, as well as new materials, especially hard deformable materials. The paper presents the results of theoretical and experimental rolling process of aluminum bars with a diameter of 20 mm. As the stock round bars with a diameter of 25 mm made of aluminum grade 1050A ...

This paper (SPE 173892) was revised for publication from paper OTC 25335, first presented at the Offshore Technology Conference, Houston, 5–8 May 2014. Original manuscript received for review 20 June 2014. Revised manuscript received for review 27 October 2014. Paper peer approved 4 November 2014. Summary Steel catenary risers (SCRs) on a large-heave-motion vessel are susceptible to compression...

Three-dimensional (3D) root system architecture (RSA) is a predominant factor in anchorage failure trees. Only few studies have used 3D laser scanners to evaluate RSA, but they do not check the accuracy of measurements. can quickly obtain RSA data, data are collected as point cloud with large number points representing surfaces. The must be converted into set interconnected axes and segments co...

The formed-in-place pipe (FIPP) is a trenchless technology used for pipeline rehabilitation. It folded PVC that expands through thermoforming to fit tightly inside the host pipe. However, deficiencies during construction of FIPP liners such as insufficient inflation, misalignment and initial deformation will lead elliptical liner, which affects load-bearing performance liner makes it susceptibl...

The article shows the influence of technological system an automated lathe, in particular cam chucks, on accuracy machining bearing rings for production conditions. value deformation during machining, i.e., non-circularity ring a single row tapered roller 32017X outer diameter, was investigated. For study, samples were selected that processed under same conditions directly unit PJSC “SKF Ukrain...

The main motivation of using an acoustic vector-sensor in direction-of-arrival (DOA) estimation applications has been its unambiguous two-dimensional directivity, insensitivity to the range of sources, and independence of signal frequency. The main objection lies in its lack of geometry-redundancy and limited degree of freedom. Four thus emerged challenging tasks and the corresponding solutions...