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Готові списки джерел за темами / Coefficient of Sound

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Добірка наукової літератури з теми "Coefficient of Sound"

Автор: Grafiati

Опубліковано: 3 червня 2025

Оновлено: 31 липня 2025

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Статті в журналах з теми "Coefficient of Sound"

1

Kato, Taro, Takuya Kitamura, Fumiya Maehara, et al. "Calculation of 1/f Fluctuation from Sound Signal and Comfort Evaluation." Applied Sciences 12, no. 19 (2022): 9425. http://dx.doi.org/10.3390/app12199425.

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Providing a comfortable sound for users is an important factor for high-value products. Therefore, many studies have investigated pleasant sound levels for developing and manufacturing new products. Notably, sounds containing 1/f fluctuations provide a relaxing effect in humans. There are many studies on the influence of sound signals, including 1/f fluctuations; however, the verification of fluctuations, including sound signals, has not been performed. In this study on fluctuation, the discrete Fourier transform was used to directly calculate the time of the sound signal. We evaluated the dur

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2

Defrianto, Defrianto, Muhammad Ahlunnazah, Saktioto Saktioto, and Nuraina Fika Lubis. "Acoustic Absorption Coefficient of Oil Palm Midrib Composite." Jurnal Fisika Flux: Jurnal Ilmiah Fisika FMIPA Universitas Lambung Mangkurat 22, no. 1 (2025): 84. https://doi.org/10.20527/flux.v22i1.20339.

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Composite from oil palm midrib waste is one of the natural fiber materials that can reduce noise. Its material sample composite with gypsum was placed inside an impedance tube, which fitted with the mass of palm midrib mill, i.e., 0.1 kg, 0.15 kg, and 0.2 kg. Next, sound absorption coefficients were measured based on the two farthest ranges of the sound-receiving microphone, i.e., range A, which was 45 cm from the sample, and range B, which was 55 cm from the sample. Sound source frequencies were used, i.e., 125 Hz, 250 Hz, 500 Hz, 1000 Hz, and 2000 Hz. This research found that the link betwee

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3

Szamel, Grzegorz, and Elijah Flenner. "Microscopic analysis of sound attenuation in low-temperature amorphous solids reveals quantitative importance of non-affine effects." Journal of Chemical Physics 156, no. 14 (2022): 144502. http://dx.doi.org/10.1063/5.0085199.

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Sound attenuation in low-temperature amorphous solids originates from their disordered structure. However, its detailed mechanism is still being debated. Here, we analyze sound attenuation starting directly from the microscopic equations of motion. We derive an exact expression for the zero-temperature sound damping coefficient. We verify that the sound damping coefficients calculated from our expression agree very well with results from independent simulations of sound attenuation. Small wavevector analysis of our expression shows that sound attenuation is primarily determined by the non-affi

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4

Laukaitis, Antanas, and Vytautas Lasauskas. "AKYTOJO BETONO GARSO ABSORBCIJOS TYRIMAI/POROUS CONCRETE SOUND ABSORPTION INVESTIGATION." JOURNAL OF CIVIL ENGINEERING AND MANAGEMENT 2, no. 8 (1996): 67–72. http://dx.doi.org/10.3846/13921525.1996.10590174.

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Low-density porous concrete can be used as a sound absorbing material. This paper generalizes porous concrete sound absorption investigations. Porous concrete relative wave resistance modulus is longer than air wave resistance W=1 and that is why this material can be ascribed to materials with a high resistance to air flows, i.e. materials with a satisfactory sound absorption. Various thickness porous concrete sample sound absorption coefficients can be calculated according to equations (1), (2), (3), when wave parameter values are determinated (Table 1). Normal sound absorption coefficient me

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5

Sakamoto, Shuichi, Kodai Sato, and Gaku Muroi. "Improvement of Sound-Absorbing Wool Material by Laminating Permeable Nonwoven Fabric Sheet and Nonpermeable Membrane." Technologies 12, no. 10 (2024): 195. http://dx.doi.org/10.3390/technologies12100195.

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Thin sound-absorbing materials are particularly desired in space-constrained applications, such as in the automotive industry. In this study, we theoretically analyzed the structure of relatively thin glass wool or polyester wool laminated with a nonpermeable polyethylene membrane and a permeable nonwoven fabric sheet. We also measured and compared the sound-absorption coefficients of these samples between experimental and theoretical values. The sound-absorption coefficient was derived using the transfer matrix method. The Rayleigh model was applied to describe the acoustic behavior of glass

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6

Jayamani, Elammaran, Pushparaj Ezhumalai, Sinin Hamdan, and M. Rezaur Rahman. "Investigation on Sound Absorption Coefficients of Betel Nut Fiber Reinforced Polymer Matrix Composites." Applied Mechanics and Materials 465-466 (December 2013): 901–5. http://dx.doi.org/10.4028/www.scientific.net/amm.465-466.901.

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This research investigates the sound absorption coefficients of betel nut fibers (Areca Fibers) reinforced with thermoplastic (Polypropylene) and thermoset (Unsaturated polyester) matrix composites with different fiber loadings and frequencies. In this research we used 5%, 10%, 15%, and 20% of betel nut fibers in the polymer matrix and the test frequencies are from 400 Hz to 1800 Hz. There are two standardized methods used for measuring the normal incidence sound absorption coefficient of composites namely, standing wave method (ISO 10534-1) and two fixed microphone method (ISO 10534-2). From

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7

Tomiku, Reiji, Noriko Okamoto, Toru Otsuru, Shun Iwamoto, and Shoma Suzuki. "Finite element sound field analysis on measurement of absorption coefficient in a reverberation room -Relationships between inclination of walls and measurement results-." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 1 (2021): 5571–77. http://dx.doi.org/10.3397/in-2021-3158.

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The absorption coefficients in a reverberation room are most representative measure for evaluating absorption performance of architectural materials. However, it is well known that measurement results of the coefficient vary according to a room shape of the measurement and area of the specimen. Numerical analyses based on wave acoustics are effective tools to investigate these factors on absorption coefficient measurement in reverberation room. In this study, sound fields for the measurement of absorption coefficient in reverberation room are analyzed by time domain finite element method (TDFE

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8

IM, Seung Uk, Cheong Ah Lee, Changsoo Kim, and Dong-guk Paeng. "A study on the prediction model of water column sound absorption coefficients considering the characteristics of the East Sea of South Korea." Journal of the Acoustical Society of America 154, no. 4_supplement (2023): A134. http://dx.doi.org/10.1121/10.0023032.

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East Sea of Korea has the deepest water depth among Korean seas, and the water column changes are distinct in space and time, resulting in a wide range of water column sound absorption coefficients. In this study, we calculate and analysis the spatiotemporal variation of water column sound absorption coefficient in the East Sea of Korea, which has unique oceanographic characteristics. Using extensive CTD data from the Korea Oceanographic Data Centre (KODC) from 1991 to 2021, we calculate the sound absorption coefficient using the widely applied Francois–Garrison model and reveal the unique abs

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9

Kang, Chun-Won, Kazuharu Hashitsume, and Eun-Suk Jang. "Investigation of the sound-absorbing performances of pure coffee grounds." BioResources 18, no. 2 (2023): 3308–18. http://dx.doi.org/10.15376/biores.18.2.3308-3318.

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Various natural sound-absorbing materials such as rice by-products, coir fiber, date palm fiber, peanut husks, hardwood cross-sections, and forest by-products have been introduced to replace petroleum-based sound-absorbing materials in previous studies, and their sound-absorbing performance was significant. This study investigated the sound-absorbing performance of pure coffee grounds as an eco-friendly sound-absorbing material. After inserting coffee grounds into cylindrical holders with lengths of 20, 30, and 40 mm, the density of the coffee grounds was adjusted from 0.2 to 0.5 g/cm3. Then,

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10

Satoh, Takamasa, Shuichi Sakamoto, Shunsuke Unai, et al. "Sound-absorption coefficient of a pin-holder structure for sound waves incident in the direction perpendicular to the cylinder's axis." Noise Control Engineering Journal 70, no. 2 (2022): 136–49. http://dx.doi.org/10.3397/1/377012.

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In this study, the sound-absorption coefficients of a pin-holder structure consisting of a group of cylinders were estimated and compared with the experimental values for the case where sound waves are incident in the direction perpendicular to the cylinder's axis. To estimate the sound-absorption coefficient, the gap in the pinholder structure is divided into elements and approximated as being between two parallel planes, taking the exact shape of the divided elements into account. The characteristic impedance and propagation constant of the approximated clearances were calculated and treated

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Дисертації з теми "Coefficient of Sound"

1

Pinçon, Hervé. "Investigation of a medium with a negative coefficient of nonlinearity." Thesis, Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/18380.

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2

Jenkin, Lance. "Application of cepstral techniques to the automated determination of the sound power absorption coefficient." Master's thesis, University of Cape Town, 2012. http://hdl.handle.net/11427/16913.

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Includes bibliographical references.<br>This thesis builds on research by Bolton and Gold, who developed the theory of using cepstral analysis to determine the absorption coefficient of elastic porous materials. Jongens, in his Masters thesis, applied this technique to determine the absorption coefficient of asphalt samples mounted in a sample holder at the end of a tube. Jongens and others identified numerous factors that introduced uncertainties into the measurement. These uncertainties fall into two main categories. The first deals with the influences that the links of the measurement chain

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3

Vissamraju, Krishnasudha. "Measurement of absorption coefficient of road surfaces using impedance tube method." Auburn, Ala., 2005. http://repo.lib.auburn.edu/2005%20Summer/master's/VISSAMRAJU_KRISHNASUDHA_59.pdf.

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4

SHTREPI, LOUENA. "Measurement traceability of sound scattering coefficient of diffusive surfaces used in room acoustics and virtual acoustical environments." Doctoral thesis, Politecnico di Torino, 2015. http://hdl.handle.net/11583/2608163.

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The best concert halls take benefit not only from the basic room shape but also from the corrugations of the walls. These diffusive surfaces are responsible for energy mixing, energy extraction from geometrical paths, for filling gaps and increasing reflections density in the impulse response. Hence, performance spaces are characterized by a complex sound field, due to the presence of absorptive and diffusive surfaces. The acoustic properties of these surfaces are characterized based on laboratory standardized measurements. Despite this, no sufficiently satisfactory databases exist. Thus, acou

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5

Onen, Onursal. "Development Of An Effective Single Layer Micro-perforated Sound Absorber." Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/3/12610064/index.pdf.

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Micro-perforated sound absorbers with sub-millimeter size holes can provide high absorption coefficients. Various types of micro-perforated absorbers are now available in literature for different applications. This thesis presents results of work on the development of an effective single layer micro-perforated sound absorber from the commercial composite material Parabeam with micro diameter holes drilled on one side. Parabeam is used as a structural material made from a fabric woven out of a E-glass yarn and consists of two decklayers bonded together by vertical piles in a sandwich structure

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6

Ducret, Fabrice. "Studies of sound generation and propagation in flow ducts." Licentiate thesis, Stockholm : Royal Institute of Technology, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4049.

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7

Aslan, Gokhan. "Cepstral Deconvolution Method For Measurement Of Absorption And Scattering Coefficients Of Materials." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/3/12608021/index.pdf.

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Several methods are developed to measure absorption and scattering coefficients of materials. In this study, a new method based on cepstral deconvolution technique is proposed. A reverberation room method standardized recently by ISO (ISO 17497-1) is taken as the reference for measurements. Several measurements were conducted in a physically scaled reverberation room and results are evaluated according to these two methods, namely, the method given in the standard and cepstral deconvolution method. Two methods differ from each other in the estimation of specular parts of room impulse responses

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8

Meng, Han. "Acoustic properties of novel multifunctional sandwich structures and porous absorbing materials." Thesis, Lyon, 2018. http://www.theses.fr/2018LYSEC008/document.

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La mise en oeuvre de matériaux acoustiques est une méthode efficace et très utilisée pour réduire le bruit le long de sa propagation. Les propriétés acoustiques de nouvelles structures sandwich multifonctionnelles et de matériaux absorbants poreux sont étudiées dans la thèse. Les principales contributions de la thèse sont les suivantes: Les panneaux sandwich ont généralement d'excellentes propriétés mécaniques et un bon indice de perte en transmission sonore (STL), mais aucune capacité d'absorption acoustique. De nouvelles structures sandwich multifonctionnelles sont développées en intégrant d

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9

Jongens, Adrian Wynand Doride. "Application of cepstrum techniques and a guard tube to the measurement of the normal incident sound power absorption coefficient of road surfaces in-situ." Master's thesis, University of Cape Town, 1993. http://hdl.handle.net/11427/9639.

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Includes bibliographical references.<br>The work described in this thesis was directed towards studying signal processing techniques that could best be incorporated in an apparatus that was to measure the plane wave sound power absorption coefficient of road surfaces in-situ. Road traffic noise has been identified as the greatest noise pollutant in the industrialised world with the tyre/road interaction being the major source of noise for traffic speeds in excess of 50 km/hr. Open pore bitumen asphalt material has been found to present a sound absorbing surface that is able to contribute to th

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10

Джур, Ярослав Володимирович. "Акустична модернізація конференц-залу". Bachelor's thesis, КПІ ім. Ігоря Сікорського, 2021. https://ela.kpi.ua/handle/123456789/43159.

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Об’єктом дослідження в даній роботі є методи розрахунку акустичних параметрів конференц-залів. Метою дослідження роботи є проектування та модернізація акустичних умов конференц-залів та захист приміщень від шумів. Актуальність дослідження заключається у високому попиті на багатоцільові зали з хорошими акустичними параметри серед бізнесу та освіти. Методом дослідження є теоретичне проектування залу та покращення його акустичних параметрів за допомогою опрацювання та аналізу літури по архітектурній акустиці. Предметом дослідження є методи та засоби покращення акустичних характеристик приміще

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Книги з теми "Coefficient of Sound"

1

Plumb, G. D. Optimum methods for the measurement of the absorption coefficients of materials. Research Department, Engineering Division, British Broadcasting Corporation, 1992.

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2

Wayman, James L. Effect of sealants of the sound adsorption coefficients of acoustical friable insulating materials: By James L. Wayman and Mary K. Lory. NavalPostgraduate School, 1985.

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3

Standard test method for sound absorption and sound absorption coefficients by the reverberation room method: Designation C 423-02a. ASTM International, 2003.

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4

Rez, Peter. Ground Transportation: Ships. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780198802297.003.0012.

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The drag on ships comes from movement through the water. There is a part that is analogous to the parasitic drag in aircraft, and a part that comes from creating the bow and stern waves—in some ways similar to the compressibility drag in aircraft that approach the speed of sound. Given that the density of water is more than 800 times that of air, speeds through the water are slower. Drag coefficients are specified differently for ships than for cars, trucks and airplanes. The relevant area is the total wetted area, and not the frontal projected area. Ships can be very efficient—the very powerf

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Частини книг з теми "Coefficient of Sound"

1

Hamilton, Mark F., Yurii A. Ilinskii, and Evgenia A. Zabolotskaya. "Dispersion." In Nonlinear Acoustics. Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-58963-8_5.

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AbstractDispersion introduces asynchronism in the nonlinear interaction of frequency components in a wave, which reduces the efficiency of energy transfer between harmonics. Two examples of weak dispersion are considered, one due to relaxation, for which an analytical solution for a step shock is available, and another due to thermoviscous boundary layers in ducts. Strong dispersion is considered for propagation of sound in nonplanar waveguide modes, with a nonlinear Schrödinger equation presented for narrowband pulses. Also considered is propagation in bubbly liquids, with a nonlinear evoluti

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2

Bogojević, Nebojša, Branko Radičević, Aleksandar Vranić, and Snežana Ćirić Kostić. "Coefficient of Sound Absorption of Polyamide PA12 Samples Manufactured by Selective Laser Sintering." In Springer Proceedings in Physics. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-54136-1_15.

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3

Gautam, Chitra, Naveen Garg, A. Devi, and Gaurav Purohiit. "Prediction of Sound Absorption Coefficient of Acoustical Materials Using Artificial Neural Network Model." In Handbook of Vibroacoustics, Noise and Harshness. Springer Nature Singapore, 2024. https://doi.org/10.1007/978-981-97-8100-3_53.

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4

Gautam, C., N. Garg, A. Devi, and G. Purohit. "Prediction of Sound Absorption Coefficient of Acoustical Materials Using Artificial Neural Network Model." In Handbook of Vibroacoustics, Noise and Harshness. Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-99-4638-9_53-1.

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5

Inamdar, D. M., P. S. Kachare, and S. Y. Salunkhe. "Analysis of Sound Absorption and Damping Coefficient for Different Configurations of Aluminum Metal Foam." In Techno-Societal 2018. Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-16962-6_96.

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6

Khunarsa, Peerapol, Chidchanok Lursinsap, and Thanapant Raicharoen. "Impulsive Environment Sound Detection by Neural Classification of Spectrogram and Mel-Frequency Coefficient Images." In Lecture Notes in Electrical Engineering. Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-12990-2_38.

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Carstensen, Edwin L., and David R. Bacon. "Biomedical Applications." In Nonlinear Acoustics. Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-58963-8_15.

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AbstractThis chapter discusses the acoustical properties of tissues and the impact of nonlinear propagation effects in medical ultrasound. Aspects of this discussion include characteristics of medical equipment as measured in water, the relationship of measurements in water to the levels in tissues, and the implications of these fields for biological effects. Expressions are provided for estimating the shock formation distance in sound beams, and the effective absorption coefficient for ultrasound containing shocks. Also discussed are heating associated with the formation of shocks, biomedical

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Ryu, SolJi, BokSeong Choe, JeonKook Lee, and YongBok Lee. "Correlation Between Friction Coefficient and Sound Characteristics for Cage Instability of Cryogenic Deep Groove Ball Bearings." In Proceedings of the 9th IFToMM International Conference on Rotor Dynamics. Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-06590-8_159.

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9

Strauch, D. "AlN: elastic coefficients, sound velocities." In New Data and Updates for IV-IV, III-V, II-VI and I-VII Compounds, their Mixed Crystals and Diluted Magnetic Semiconductors. Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-14148-5_64.

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Sueur, Jérôme. "Mel-Frequency Cepstral and Linear Predictive Coefficients." In Sound Analysis and Synthesis with R. Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-77647-7_12.

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Тези доповідей конференцій з теми "Coefficient of Sound"

1

Zhu, Congyun, Zheng Wu, Guofang Ding, Lei Yuan, and Zhoubo Ding. "The research of sound absorption coefficient in automobile cabs based on time delay." In 10th International Conference on Mechanical Engineering, Materials, and Automation Technology (MMEAT 2024), edited by Yunhui Liu and Zili Li. SPIE, 2024. http://dx.doi.org/10.1117/12.3046893.

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2

Zhang, Wenxuan, Zhenwei Bian, Qiaoli Zhang, and Fuchen Liu. "Coherence coefficient and interference structure of the convergence zone with broadband sound source." In International Conference on Image, Signal Processing, and Pattern Recognition (ISPP 2025), edited by Haiquan Zhao and Xinhua Tang. SPIE, 2025. https://doi.org/10.1117/12.3070920.

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3

Kalifa, Mohamed, Andrew Starr, and Muhammad Khan. "Analyzing Frictional Noise for Wear Monitoring under Dry and Lubrication Condition: Experimental Modelling with Pin-on-Disc Tribometer." In The 12th International Conference on Fracture Fatigue and Wear. Trans Tech Publications Ltd, 2025. https://doi.org/10.4028/p-4mmtt5.

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In industrial settings, the use of frictional noise to improve wear monitoring is highly promising. It enables the identification of changes in friction and wear conditions, the assessment of different phases of wear, and the examination of the impact of wear on machine performance. By analysing acoustic signatures, it is conceivable to continuously monitor the wear characteristics and surface conditions. This helps in predicting wear and detecting aberrant wear regimes in real-time. The data demonstrate that in dry conditions, the aluminum disc has higher coefficients of friction relative to

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4

Khrystoslavenko, Olga, and Raimondas Grubliauskas. "THEORETICAL PREDICTIONS OF SOUND SCATTERING COEFFICIENT AND SOUND DIFFUSION COEFFICIENT FROM QUADRATIC RESIDUE DIFFUSERS." In 22-oji jaunųjų mokslininkų konferencijos „Mokslas – Lietuvos ateitis“ teminė konferencija APLINKOS APSAUGOS INŽINERIJA. Vilnius Gediminas Technical University, 2020. http://dx.doi.org/10.3846/aainz.2019.007.

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Quadratic residue diffuser (QRD) is a device that distributes the acoustic energy of intense reflections by its spatial and temporal dispersion. The quadratic residue diffuser consists of a series of wells of different depths and the same width. Optimal diffusion is very important for perceiving musical sound and eliminating unwanted acoustic effects e.g. echoes. For the purpose to determine the optimal diffusion, Schroeder used mathematical number sequences allowing to diffuse the sound in a semicircular pattern from the devices. In this paper, the presented quadratic residue diffuser modelin

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Bilova, Monika. "IN�SITU�MEASUREMENT�OF�SOUND�ABSORPTION�COEFFICIENT." In SGEM2012 12th International Multidisciplinary Scientific GeoConference and EXPO. Stef92 Technology, 2012. http://dx.doi.org/10.5593/sgem2012/s20.v5070.

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Sachakamol, Punnamee, and Liming Dai. "Parametric Influence on the Sound Absorption Coefficient of Porous Asphalt." In ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-11477.

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This research intends to develop a method for predicting the sound absorption coefficient of various porous highway pavement materials. Since many of the existing prediction models for acoustic properties and traffic noise still have limitations and problems with accuracy, sound absorption coefficients are measured with the impedance tube method to verify numerical values obtained from the model. Results obtained from the experiment and numerical simulations are compared and presented to reveal the effect and influence of the control parameters.

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7

Zhao, Yuli, Laith Neima Egab, Weishan Chen, Haiqiao Wei, and Xu Wang. "Development of 45° Incident Angle Sound Absorption Coefficient Test Device for Design of Vehicle Interior Trim Sound Package." In ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-36103.

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This paper presents a new type of test device, which is the 45-degree incident angle sound absorption coefficient (SAC) test device. A V-shaped acoustic wave-guide with the two branches forming a 45 degree angle from the horizontal direction was designed to measure the sound absorption coefficient of installed trim materials. The device was also designed for the subjective evaluation and objective psychoacoustic metric target setting of a sound source. The 45-degree incident angle sound absorption coefficient test device can also be applied to the design of the vehicle interior trim materials

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8

Hong, K. L., and S. T. Raveendra. "Computation of Sound Transmission Loss and Absorption Coefficient of Multi-Layer Systems." In ASME 2001 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/imece2001/nca-23516.

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Abstract Sound transmission and absorption of multi-layer sound absorbents are discussed in this manuscript. A new matrix formulation based on four pole parameters is utilized to derive the transmission loss and absorption coefficient of the absorbents. A transfer matrix relating pressure to acoustic velocity provides the required information to calculate the transmission loss and absorption coefficient. The multi-layer sound absorbents considered are structural panels, elastic porous linings and air-gaps. No limitations are imposed on the number of layers. Some realistic configurations of a m

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9

Astrauskas, Tomas, and Raimondas Grubliauskas. "Modelling of Incident Wave Sound Absorption Coefficient of Paper Sludge Panels." In 11th International Conference “Environmental Engineering”. VGTU Technika, 2020. http://dx.doi.org/10.3846/enviro.2020.820.

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Paper sludge is the water treatment waste, which produced during paper production. Paper sludge (PS) waste utilization is the common problem in the EU and internationally. According to authors Frías et al. paper sludge is the main waste in the paper processing factories, the percentage reach 35% of product volume. According to the waste management directive No. 2008/98/EC, paper sludge waste should not be utilised in landfills. Such legislation generates the motivation of this study. This study deals with paper sludge as sound absorbing material. In this paper panels made of paper sludge is st

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KHRYSTOSLAVENKO, Olga, and Raimondas GRUBLIAUSKAS. "Experimental research of scattering coefficient of triangle diffuser made with charcoal." In 12th International Conference “Environmental Engineering”. VILNIUS TECH, 2023. http://dx.doi.org/10.3846/enviro.2023.861.

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The acoustic diffuser is the device that distributes the acoustic energy of intense reflections through their spatial and temporal dispersion. The device for reduction of unvented acoustic effects and improves indoor sound quality. Triangle diffusers are made of wood plates and covered with charcoal elements. The high sound reflection co-efficient of charcoal is in the production of diffusers. Charcoal is an ecologically friendly and natural material. The result of studies of the triangle diffusers made of charcoal showed high values of the sound scattering coefficient, with a maximum value (o

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Звіти організацій з теми "Coefficient of Sound"

1

Wei, Fulu, Ce Wang, Xiangxi Tian, Shuo Li, and Jie Shan. Investigation of Durability and Performance of High Friction Surface Treatment. Purdue University, 2021. http://dx.doi.org/10.5703/1288284317281.

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The Indiana Department of Transportation (INDOT) completed a total of 25 high friction surface treatment (HFST) projects across the state in 2018. This research study attempted to investigate the durability and performance of HFST in terms of its HFST-pavement system integrity and surface friction performance. Laboratory tests were conducted to determine the physical and mechanical properties of epoxy-bauxite mortar. Field inspections were carried out to identify site conditions and common early HFST distresses. Cyclic loading test and finite element method (FEM) analysis were performed to eva

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2

Jones, David, Roy Cook, John Sovell, et al. Natural resource condition assessment: Lincoln Boyhood National Memorial. National Park Service, 2024. http://dx.doi.org/10.36967/2301822.

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Анотація:

The National Park Service (NPS) Natural Resource Condition Assessment (NRCA) Program administered by the NPS Water Resources Division evaluates current conditions for important natural resources and resource indicators using primarily existing information and data. NRCAs also report on trends in resource condition, when possible, identify critical data gaps, and characterize a general level of confidence for study findings. This NRCA complements previous scientific endeavors, is multi-disciplinary in scope, employs a hierarchical indicator framework, identifies and develops reference condition

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3

Ocampo-Gaviria, José Antonio, Roberto Steiner Sampedro, Mauricio Villamizar Villegas, et al. Report of the Board of Directors to the Congress of Colombia - March 2023. Banco de la República de Colombia, 2023. http://dx.doi.org/10.32468/inf-jun-dir-con-rep-eng.03-2023.

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Анотація:

Banco de la República is celebrating its 100th anniversary in 2023. This is a very significant anniversary and one that provides an opportunity to highlight the contribution the Bank has made to the country’s development. Its track record as guarantor of monetary stability has established it as the one independent state institution that generates the greatest confidence among Colombians due to its transparency, management capabilities, and effective compliance with the central banking and cultural responsibilities entrusted to it by the Constitution and the Law. On a date as important as this,

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