Catalogue Search | MBRL
Are you sure you want to remove the book from the shelf?
{{itemTitle}}
4,444
result(s) for
"Sound Experiments."
Sort by:
Investigating sound
Explains the properties of sound with experiments and investigations that explore how the energy form is affected by material density, pitch, and distance.
Book
The Psychophysical Ear
In the middle of the nineteenth century, German and Austrian concertgoers began to hear new rhythms and harmonies as non-Western musical ensembles began to make their way to European cities and classical music introduced new compositional trends. At the same time, leading physicists, physiologists, and psychologists were preoccupied with understanding the sensory perception of sound from a psychophysical perspective, seeking a direct and measurable relationship between physical stimulation and physical sensation. These scientists incorporated specific sounds into their experiments--the musical sounds listened to by upper middle class, liberal Germans and Austrians. In The Psychophysical Ear, Alexandra Hui examines this formative historical moment, when the worlds of natural science and music coalesced around the psychophysics of sound sensation, and new musical aesthetics were interwoven with new conceptions of sound and hearing. Hui, a historian and a classically trained musician, describes the network of scientists, musicians, music critics, musicologists, and composers involved in this redefinition of listening. She identifies a source of tension for the psychophysicists: the seeming irreconcilability between the idealist, universalizing goals of their science and the increasingly undeniable historical and cultural contingency of musical aesthetics. The convergence of the respective projects of the psychophysical study of sound sensation and the aesthetics of music was, however, fleeting. By the beginning of the twentieth century, with the professionalization of such fields as experimental psychology and ethnomusicology and the proliferation of new and different kinds of music, the aesthetic dimension of psychophysics began to disappear.
eBook
Experimenting with sound science projects
\"Learn about sound waves, sound and music, the properties of sound and more\"-- Provided by publisher.
Book
An optimal design of the internal space in a micro-speaker module
The development of display and battery technologies has led to the miniaturization of smart devices. However, the acoustic performance of micro speakers using less than 1–2 cm3 of space has been limited. Internal space management for modules with limited internal volumes is a critical factor in the acoustic performance of mobile devices. Previous studies have mostly focused on improving the performance of a micro speaker itself. This study has sought to identify the characteristics of resonant space by performing an anechoic chamber experiment using the Taguchi method and by using the finite element analysis of a micro-speaker module. As a result, an optimum internal space was designed based on the effects of the structural characteristics of the interior of the microspeaker module on the acoustic performance. In particular, focus was placed on the rise in sound pressure at low frequencies and on the flatness of the sound pressure at high frequencies related to the size and shape of the internal space.
Journal Article
Sound
\"In this book, young readers will learn about sound, and discover fun experiments to test their knowledge.\"-- Provided by publisher.
Book
Experimental study on sound radiation time-frequency characteristics of double cylindrical shell based on EMD
Purpose - Laying the acoustic decoupling material on the surface of underwater structures is an effective noise reduction technology. The underwater sound radiation experiment of finite stiffened double cylindrical shell with separate-sound and decoupled tile is carried out with the aim of finding out the most effective laying condition.Design methodology approach - The segmentation power function interpolation method and vertex extreme value envelope continuation method are introduced into basic theory of empirical mode decomposition (EMD). The original measured sound pressure signals are decomposed to intrinsic mode function (IMF) group through EMD, and the high-frequency components are filtered out. Because the mechanical noise of submarine is mainly at low frequency, the IMFs in low frequency are researched through power spectrum analysis. The noise reduction effects of different separate-sound and decoupled tile laying conditions are compared.Findings - The sound pressure signal components' amplitudes, periods and phases are obtained through EMD. The test data show that the double cylindrical shell entirely covered with separate-sound and decoupled tile is the most effective laying condition in noise reduction.Originality value - With reference to the case study, this is believed to be the first application of the EMD in sound radiation time-frequency characteristics of double cylindrical shell. The evaluation of separate-sound and decoupled tile laying conditions is of great importance in engineering applications.
Journal Article
Reciprocal sound transmission measurement of mean current and temperature variations in the central part (Aki-nada) of the Seto Inland Sea, Japan
A 30 km-range reciprocal sound transmission experiment was carried out on the line connecting Honshu and Shikoku (the first and fourth biggest main Japanese islands, respectively) in the central part (Aki-nada) of the Seto Inland Sea, Japan, during March–May 2010 to measure the mean current and temperature variations over the sea. The range-averaged current along the sound transmission line was estimated to have a mean and standard deviation of (3.8–4.4) ± (1.7–1.8) cm/s after converting the travel time difference data into currents, including a fortnightly tidal variation in the range of ±30 cm/s. The positive mean current implies slow water movement from the west to east through Aki-nada. The range-averaged speed of sound was estimated by converting from the mean travel time or one-way travel time into the speed of sound, and further converted into temperature for fixed values of salinity and depth, according to the standard speed of sound formula. Besides the precise measurement (to an accuracy of 0.01°C) of semidiurnal and diurnal tidal variations and seasonal warming, the temperature data showed periodic variations with periods of 7.0 and 21.1 days that had never been observed in Aki-nada before. This study suggests that reciprocal sound transmission is a powerful technique for the long-term accurate measurement of mean current and temperature variations in coastal and inland seas.
Journal Article
Extraction and Quantitation of Phytosterols from Edible Brown Seaweeds: Optimization, Validation, and Application
Brown seaweeds are known as important marine food sources, from which phytosterols have been recognized as functional food components with multiple health-beneficial effects. However, studies on phytosterol extraction and quantitation from edible brown seaweeds are limited. In the present work, extraction methods for seaweed phytosterols were compared and optimized by one-factor-at-one-time method and response surface methodology. Moreover, the quantitation method of total sterols and major sterol components, including fucosterol, saringosterol, and ostreasterol, was established and validated using 1H NMR. Furthermore, the developed extraction and determination methods were applied to investigate three common edible seaweeds from Japan (Hijiki, Wakame, and Kombu). As a result, the finally optimized conditions were ultrasound-assisted extraction with CHCl3-MeOH 2:3 for 15 min followed by saponification with 1.65 mL of 1.85 M KOH for 14.5 h. Based on the developed methods, phytosterols in three seaweeds were compared, and Hijiki showed an abundant total sterol amount (2.601 ± 0.171 mg/g DW), significantly higher than Wakame (1.845 ± 0.137 mg/g DW) and Kombu (1.171 ± 0.243 mg/g DW). Notably, the composition of the sterol components varied in different seaweeds. These findings might help the nutritional investigation and functional food development concerning phytosterols from seaweeds.
Journal Article