Light of the Soul

Liszi’s work creates visual signs derived from spherical forms of sacred geometry on photograms. Her camera-less images focus on Oneness – universe and us, based on the Light of the Soul. She works with her voice that creates ripples in water. Her experiments began with exploring the Bija mantras Aum, RaMaDaSa, and lastly SaTaNaMa that describes the eternal circle of life: birth, life, death, rebirth. Her experimentation led from mantra vibration in still water (life symbol) to light vibration (life symbol) as information carrier. The fundamental connection between water waves and light waves inspired extra stimulus in her experimental work. Quantity of water, shapes of bowls, colours of light, angles of light – are all various avenues of exploration. The sacred geometric angles and the variety of the wavelengths of electromagnetic vibrations created intimate, meditative space that gives birth to these unique photograms. Her initial experiments were with B&W positive papers then 5 × 4″ and 10 × 8″ B&W negative films. The orthochromatic negatives allowed her to work in safelight, which led to the creation of enlarged images mixed with other wavelengths. Thus, monochrome was reborn through colour.

Self-noise of NACA 0012 and NACA 0021 aerofoils at the onset of stall

The aerodynamic noise of a NACA 0012 and NACA 0021 aerofoil is measured and compared in order to determine whether there are differences in their noise signatures with a focus on the onset of stall. Measurements of the self-noise of each aerofoil are measured in an open-jet Anechoic Wind Tunnel at Reynolds numbers of 64,000 and 96,000, at geometric angles of attack from −5° through 40° at a resolution of 1°. Further measurements are taken at Re = 96,000 at geometric angles of attack from −5 through 16° at a resolution of 0.5°. Results show that while the noise generated far into the stall regime is quite similar for both aerofoils the change in noise level at the onset of stall is significantly different between the two aerofoils with the NACA 0021 exhibiting a much sharper increase in noise levels below a chord-based Strouhal number of Stc = 1.1. This behaviour is consistent with the changes in lift of these aerofoils as well as the rate of collapse of the suction peak of a NACA 0012 aerofoil under these flow conditions.

Influence of Cutting Parameters and Tool Geometric Angles on TC4 Titanium Alloy Chip Shape

To select reasonable cutting parameters, improve the processing surface quality, and extend the tool life, this paper uses four solid carbide end milling tools to process TC4 titanium alloy, and analyses the influence of the difference cutting parameters and the geometric angles to chip shape. The experiment results indicate that the degree of serrated chip shape is increased by increasing the feed rate under the condition of certain spindle speed. But the degree of serrated chip shape may be decreased by the adoption of small axial and radial depth, or bigger rake angle and smaller helix angle. Select larger rake angle, cutting edge is sharp, the metal deformation of cutting layer is small, which can reduce the friction force when chip flowing through the tool rake face, so that the cutting force and cutting temperature decreases accordingly.The greater the helix angle is, the worse the chip removal conditions is, and the degree of serrated chip becomes larger, the blade is more sharp, easily crack, and the tool life decreases. So relatively small helix angle is better. The choice of angles is interrelated with each other, the selection of some angle separately cannot get the desired reasonable value.