Measurements of the spiral arms (their pitch angle, number, shape, and the interarm separation) in the Milky Way have been published in the period from 1980 to early 2005, using different methods that yielded slightly or widely differing values, depending on hidden or unknown biases. A meta-analysis would be useful for searching for trends among these individual studies. First, we find a conver...

To realize a stable and efficient wireless power transfer (WPT) system that can be used in any environment, it is necessary to inspect the influence of environmental interference along transmission path WPT system. In this paper, attempts have been made reduce medium with dielectric conductive loss on using spiral resonators for resonator-coupled type (RC-WPT) An important element RC-WPT becaus...

The characteristics of cholesteric liquid crystals can be controlled by light irradiation if conformationally photo-active molecules are present. Recently, control of the selective reflection band (spiral pitch) in nemato-chiral mixtures was demonstrated when photosensitive molecules, namely nematic azoxy-based compounds, were used as the host material. In this report, the investigation of ligh...

In many biological systems, variability of the components can be expected to outrank statistical fluctuations in the shaping of self-organized patterns. In pioneering work in the late 1990s, it was hypothesized that a drift of cellular parameters (along a 'developmental path'), together with differences in cell properties ('desynchronization' of cells on the developmental path) can establish se...

Based on the study of dimensional characteristics reeds, a sprayer is proposed for treatment panicles reeds growing in elements irrigation system rice checks. The boom offered has an original shape, sprayers which are located along trajectory parabola, taking into account placement upper points across width channel and equipped with protective chamber device, made form Archimedes spiral pitch e...

Stable periodic orbits in spiral galactic models that form families of precessing ellipses can create density waves similar to those are observed real grand-design galaxies. We study the range parameter space for which amplitude perturbation, pattern speed, and pitch angle collaborate so as lead creation supported by their surrounding matter ordered motion. Quantitative estimates a correlation ...

Abstract: Pitch Control plays a significant role for a large wind turbine. This study investigates a novel robust hydraulic pitch control system of a large wind turbine. The novel hydraulic pitch control system is driven by a novel high efficiency and high response hydraulic servo system. The pitch controller, designed by two degree-of-freedom (2-DOF) motion control with feedback linearization,...

A wellbore surface is an irregular structure. The distribution of points on the measured based drilling diameter not uniform. Thus, conventional modeling method a point cloud cannot satisfy needs real-time measurement updating and display. This study proposes spiral profile for shaft reconstruction. Scattered data along are measured, inverse distance weighting cylindrical space algorithm with i...

According to the classical axisymmetric dynamo concept, differentially rotating galaxies which lack organized optical spiral patterns and density wave flows should still have spiral magnetic fields with a substantial radial component. To check this hypothesis we observed two flocculent spirals, NGC 3521 and NGC 5055, in the radio continuum (total power and polarization) at 10.55 GHz with a reso...