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Aircraft recognition generally depends on learning the external appearance of the aircraft, both friendly and hostile, most likely to be encountered. Techniques used to teach this information have included scale models, printed silhouette charts, slide projectors, computer aided instruction and even specially-printed playing cards.
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The silhouette value is a measure of how similar an object is to its own cluster (cohesion) compared to other clusters (separation). The silhouette ranges from −1 to +1, where a high value indicates that the object is well matched to its own cluster and poorly matched to neighboring clusters.
A traditional silhouette portrait of the late 18th century. A silhouette (English: / ˌ s ɪ l u ˈ ɛ t /, [1] French:) is the image of a person, animal, object or scene represented as a solid shape of a single colour, usually black, with its edges matching the outline of the subject. The interior of a silhouette is featureless, and the ...
Historical one-handed versions have blades varying from 45 to 80 cm (18 to 31 in) in length. The weight of an average sword of 70 cm (28 in) blade-length would weigh about 700 to 900 g (1.5 to 2.0 lb). [20] There are also larger two-handed versions used by ancient and medieval armies and for training by many styles of Chinese martial arts.
The blades of these swords are narrower and longer than the typical Viking sword, marking the transition to the knightly sword of the High Middle Ages. This type exhibits a broad, flat blade, 80 centimetres (2.6 ft) long on average. A very wide and shallow fuller runs down each side of the blade, fading just before the point (which is rounded).
This proved convenient for the shuriken user as the weapons could be strung on a string or dowel in the belt for transport, and the hole also had aerodynamic and weighting effects that aided the flight of the blade. [8] There are a wide variety of forms of hira-shuriken, and they are now usually identified by the number of points the blades ...
QBlade is especially adequate for teaching, as it provides a ’hands-on’ feeling for Horizontal-axis wind turbine (HAWT) rotor design and shows all the fundamental relationships between blade twist, blade chord, section airfoil performance, turbine control, power and load curves in an easy and intuitive way. QBlade also includes post ...