Measuring the speed of sound propagation in metals is easy and fast, and is not only for the laboratory. With the use of a smartphone, ruler, rosin, and vice we can measure speeds for steel, brass, aluminium, and plastic. Values differ by a few percent from the tabulated values. Following determination of the density of the material, it is also possible to determine the Young's modulus of elasticity. This method presents an opportunity for students to take physics into their own hands.
Příspěvek Jany Frankové je ohlédnutím za mezinárodní mezioborovou konferencí, která se uskutečnila v Paříži ve dnech 30. listopadu až 2. prosince 2017., Jana Franková., Rubrika: Konference, and Cizojazyčné resumé není.
Studie Marcuse Zagorskiho je věnována dílu hudebního skladatele Karlheinze Stockhausena. Autor se však na něj zaměřuje z netradičního pohledu, protože zkoumá problematiku a způsob poslechu Stockhausenovy hudby., Karlheinz Stockhausen’s theory of listening reflected essential tenets of his creative practice and aesthetic inclinations. He outlined an admirably tolerant and accepting approach to listening and encouraged different listeners to generate different formal models to describe the same music. His method of listening thereby challenged the perceptual reconstruction of known, pre-existing forms that was so important to listening in the preceding 150 years, and this complemented his compositional challenge to another established aesthetic category – that of the closed musical work. By revealing this aesthetic background, this article shows the significance of Stockhausen’s thinking about listening., Marcus Zagorski., Rubrika: Studie, and České resumé na s. 201, anglický abstrakt na s. 193.
Příspěvek Jana Kouby představuje autorovo zastavení nad jeho knihou "Slovník statočeských hymnografů". Věnuje se zde otázce pojmů hymnografie a hymnologie, německým hymnografům a dalším tématům., The article summarises all of the problems with the existing editions of Leoš Janáček’s organ compositions. The indisputable originality of the composer’s musical language, highlighted by his peculiar, inimitable notation and the nearly illegible handwriting that resulted when his hand could not keep up with his thoughts, did not always lead to comprehension of the composer’s intentions. These circumstances also emboldened the efforts of publishers to make the notation of his compositions more intelligible and often to “improve” his works in the best sense of the word. It is the author’s assertion that in spite of the existence of a Complete Critical Edition of the Works of Leoš Janáček and of many other printed editions, we shall still have to wait for an edition of Janáček’s organ works that will correct all of the errors in the musical text and will approach a return to the composer’s notation., Jan Kouba., Rubrika: Informatorium, and Anglický abstrakt na s. 223.