Design of Nonwoven Carpets to Upgrade Sound Isolation Features in Automobiles

With the increases of the expected properties of textile products, better and advanced new designs are being created. Textiles used in vehicles are increasing, and the current performance of the expectations bar is determined by automobile manufacturers. While meeting the expectations of users in the vehicle mechanically, but also disturbing the user during operation of the mechanical properties of this ratio should be minimized. This study was intended to minimize sound transmission of nonwoven textile components, which are used in cars as silencer parts. For that purpose, four different models were developed in this study. First model consists of three designs for baggage carpets. Second model has six designs for floor coverings. Third model comprises two designs inner dash felt and finally fourth model includes two designs of hood liners. The acoustical absorption coefficients and transmission loss of these carpets were tested and evaluated in the frequency range of 16-6300 Hz. The measurements demonstrated that nonwoven layer is a very significant and effective part of a carpet due to its contribution in the sound isolation. With this study, it has been determined which layer has better performance on sound absorption and transmission loss among different carpet types. A combination of heavy layer and nonwoven layer carpets is found to be benefit for noise and sound insulation.

The Onion and the Mandrake: Plants in Yezidi Folk Beliefs

The non-dogmatic character of the Yezidi religion presupposes the presence of a heavy layer of so-called “primitive” religious elements, including plant worship. This paper focuses on plants having obvious sacred connotations in Yezidi beliefs, both on the level of the cult and marginal folk beliefs. There is no explicit tree cult in the Yezidism, or dendrolatry, despite the existence of a cultic complex connected with the so-called Dārā mirāzā or “The trees of Desire”. Still, there are representatives of the flora world that bear obvious cultic attribution, the most important of which are the onion and the mandrake. The mandrake has mystical fame and reverence not only among the Yezidis, but also among many other peoples of the region. This panacea for all diseases, widely used in folk medicine, is also considered an important element of the materia magica, primarily due to its aphrodisiac qualities. This paper will provide a comparative analysis of plant worship among the Yezidis and several other traditions of the Caucaso-Iranian region.