Zobrazeno 1 - 10
of 10 456
pro vyhledávání: '"Absorption coefficient"'
Publikováno v:
Scientific Reports, Vol 14, Iss 1, Pp 1-15 (2024)
Abstract Lead-free double perovskite halides are attracting considerable interest in the optoelectronics sector due to their remarkable electronic, optical, and transport properties. These materials are not only stable and easy to synthesize but also
Externí odkaz:
https://doaj.org/article/828684070e2940798e7b6cb1467d3fad
Publikováno v:
Vestnik MGSU, Vol 19, Iss 9, Pp 1521-1529 (2024)
Introduction. Sound-absorbing systems are widely used in construction, reconstruction, repair of industrial and civil facilities, as well as in mechanical engineering. The most affordable and widely used systems are those using porous materials. The
Externí odkaz:
https://doaj.org/article/754d3a116e5842628abe82e7bf3316c4
Publikováno v:
Science and Engineering of Composite Materials, Vol 31, Iss 1, Pp 159-64 (2024)
The acoustic performance of metal hollow sphere (MHS) A356 aluminum matrix composites has a significant impact on their application, making it worthy of in-depth investigation. To investigate the acoustic performance and mechanism of MHS A356 aluminu
Externí odkaz:
https://doaj.org/article/955aa712201c4b2789af4c0e41536789
Autor:
Amani Rached
Publikováno v:
Arab Journal of Basic and Applied Sciences, Vol 31, Iss 1, Pp 429-439 (2024)
One of the pivotal characteristics of quantum wells (QW) designed for applications in filters or modulators is its absorption coefficient. This study investigates the combined influence of doping and active layer thickness on the absorption coefficie
Externí odkaz:
https://doaj.org/article/f3621d2be9b3403f936cc6ab3f2dea12
Publikováno v:
Modelling, Vol 5, Iss 3, Pp 969-989 (2024)
Effective sound absorption is crucial in environments like schools and hospitals. This study evaluates open-pore polyurethane foam and perforated onyx panels, which attenuate noise via distinct mechanisms: porous materials convert sound energy to hea
Externí odkaz:
https://doaj.org/article/862ae357a31640789d0a41a591e8aad8
Publikováno v:
Лесной журнал, Iss 4, Pp 37-48 (2024)
The ecological condition of urban plantations is an urgent problem of our time. The condition of plantations and soils characterizes the ecological and sanitary condition of the environment. In the structure of the cities, urban and forest parks are
Externí odkaz:
https://doaj.org/article/225bc4292b324d83ad0f6bf2c3c3729b
Publikováno v:
Scientific Reports, Vol 14, Iss 1, Pp 1-10 (2024)
Abstract The application of terahertz time-domain spectroscopy (THz-TDS) in the quantitative analysis of major minerals in Bayan Obo magnetite ore was explored. The positive correlation between the optical parameters of the original ore and its iron
Externí odkaz:
https://doaj.org/article/cbd973fd6c6b459bbb8ef711e4093a93
Publikováno v:
Engineering Reports, Vol 6, Iss 11, Pp n/a-n/a (2024)
Abstract The interest of this article is to obtain the underwater broadband sound absorption characteristics by filling three layers of bubbles in Polydimethylsiloxane polymer (PDMS). In this underwater ultra‐thin metamaterial, three‐layer bubble
Externí odkaz:
https://doaj.org/article/d073eab5edda407982d0281d99d6203c
Publikováno v:
Фізика і хімія твердого тіла, Vol 25, Iss 2, Pp 235-244 (2024)
The influence of confined phonons on the coefficient of interband absorption of polarized light as a function of its frequency has been investigated. A comparison was made between the obtained results and those obtained considering polarized phonons
Externí odkaz:
https://doaj.org/article/ee19eeb60bc54af1ac3c50451c8e5ef5
Autor:
Nikolay Kanev
Publikováno v:
Acoustics, Vol 6, Iss 2, Pp 509-522 (2024)
Different types of resonators are used to create acoustic metamaterials and metasurfaces. Recent studies focused on the use of multiple resonators of the dipole, quadrupole, octupole, and even hexadecapole types. This paper considers the theory of an
Externí odkaz:
https://doaj.org/article/f174217d3fcf415fbb91574ca986e1fa