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The possible uses of Madagascar rosewood
The Rosewood name includes different wood species, of the Dalbergia type, growing in the tropics, particularly in Brazil, India, America and Madagascar known by the botanical name dalbergia greveana in the latter country. Palisander which is indeed a very heavy wood, weighs kg for a volume of 1m3. Its mass, in addition to its durability and its softness, gives it the value of a fine wood. It is for this reason that in other areas, such as in marriage terms, palisander is also a sign of strength, stability and consistency: a 65th wedding anniversary is symbolised by palisander! Its great qualities both mechanical and aesthetic have made it a highly sought after wood since the eighteenth century, in particular for making high-quality furniture and musical instruments the French bassoon is made out of Brazilian rosewood, the body and the fret boards of many guitars, some clarinets, the pegs and button of the violin, viola, cello, bass, xylophone and marimba blades as well. It is also a wood often used for making sculptures as, despite its strength, it is fairly easy to carve. The "black" pieces of high quality chess sets and are often made of palisander. Other qualities are also specific to palisander.
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Spaced retrieval , also known as expanded retrieval , is a learning technique, which requires users to rehearse information to be learned at different and increasing spaced intervals of time Benigas, J. Errorless learning and spaced retrieval: How do these methods fare in healthy and clinical populations? Journal of Clinical and Experimental Neuropsychology, 33 4 , At the end of every trial period there is a test phase. Landauer and Bjork first studied this technique of learning in The study required participants to learn names from flash cards. Prior to learning participants were placed into five different rehearsal types: uniform short, uniform moderate, uniform long, expanding, and contracting. Uniform trials involve a number of trials between each test stage, but the trial numbers are fixed e. Expanding involves starting with trials and tests close together, and as they progress the person would have more time between each trial and test e. The effectiveness of the rehearsal types was measured by seeing how accurately participants responded during a test phase.