High-Density Recording Characteristics of Obliquely Oriented Particulate Magnetic Tapes by Removal of Disoriented Surface Layer
In order to achieve high recording densities, wide bandwidth and high output, a magnetic tape should have a high Bs, perpendicular orientation, a smooth surface, good head contact, and a small longitudinal component. By using a "LIPS" orienting process which produces media with a longitudinally oriented inside layer and a perpendicular oriented surface layer, we have fabricated obliquely oriented magnetic films based on acicular metal particles; of these, tape oriented at 45° had the widest-bandwidth characteristics. But a significant improvement in output was not obtained because of the existence of disoriented particles in the surface layer, resulting from calendering treatment. We tried to remove this surface layer using polishing sheets. An obliquely oriented (45°) tape exhibited an improvement in short-wavelength output (by 10 dB at 0.3 ¿m) after the thickness of the disoriented layer was reduced by 0.12 ¿m.
A Particulate Medium Oriented Longitudinally Inside and Perpendicularly at Surface
This report takes another look at the VAST (Vertical magnetic orientation-AC demagnetization-Smoothing period-sequential Train) technique used to fabricate double-layer particulate media oriented longitudinally inside and perpendicularly at the surface from CrO2 particles and nitrocellulose with a urethane binder. Infrared irradiation was performed to evaporate the solvent instead of natural evaporation to improve the viscosity of the surface perpendicular oriented layer, and to ensure a controlled thin, uniform thickness surface layer.
Ancient Greek Athletics
The earliest Olympic games began more than twenty-five-hundred years ago. What were they like, how were they organised, who participated? Were ancient sports a means of preparing youth for warfare? In this lavishly illustrated book, a world expert on ancient Greek athletics provides the first comprehensive introduction to the subject, vividly describing ancient sporting events and games and exploring their impact on art, literature, and politics. Using a wide array of ancient sources, written and visual, and including recent archaeological discoveries, Stephen Miller reconstructs ancient Greek athletic festivals and the details of specific athletic events. He also explores broader themes, including the role of women in ancient athletics, the place of amateurism, and the relationship between athletic events and social and political life. Published in the year the modern Olympic Games return to Athens, this book will be a source of information and enjoyment for anyone interested in the history of athletics and the origins of the world's most famous sporting event.