Sample thickness dependence of the exciton polariton absorption coefficient in Cu2O

Utilization of biomass for green products is still progressing in the effort to provide alternative clean technology. This paper presents the utilization of natural waste fibers from paddy as acoustic material. Samples of sound absorbing material from paddy waste fibers were fabricated. The effect of the fiber density, that is, the fiber weight and the sample thickness, and also the air gap on the sound absorption coefficient is investigated through experiment. The paddy fibers are found to have good acoustic performance with normal incidence absorption coefficient greater than 0.5 from 1 kHz and can reach the average value of 0.8 above 2.5 kHz. This result is comparable against that of the commercial synthetic glass wool. Attachment of a single layer of polyester fabric is shown to further increase the absorption coefficient.

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Sample Thickness Dependence of Minority Carrier Lifetimes Measured Using an ac Photovoltaic Method

Japanese Journal of Applied Physics ◽

10.1143/jjap.26.2033 ◽

1987 ◽

Vol 26 (Part 1, No. 12) ◽

pp. 2033-2036 ◽

Cited By ~ 4

Author(s):

Noriaki Honma ◽

Chusuke Munakata

Keyword(s):

Minority Carrier ◽

Sample Thickness ◽

Thickness Dependence ◽

Carrier Lifetimes ◽

Minority Carrier Lifetimes

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Stress Buildup in Ultraviolet-Cured Coatings: Sample Thickness Dependence

Macromolecules ◽

10.1021/ma001816n ◽

2001 ◽

Vol 34 (9) ◽

pp. 2865-2869 ◽

Cited By ~ 7

Author(s):

Andrei A. Stolov ◽

Tao Xie ◽

Jacques Penelle ◽

Shaw L. Hsu

Keyword(s):

Sample Thickness ◽

Thickness Dependence ◽

Stress Buildup

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IR Emission Spectroscopy of Molten Salts and other Liquids Using Thick Samples as Reference

Applied Spectroscopy ◽

10.1366/0003702834633920 ◽

1983 ◽

Vol 37 (2) ◽

pp. 182-187 ◽

Cited By ~ 28

Author(s):

J. Hvistendahl ◽

E. Rytter ◽

H. A. Øye

Keyword(s):

Theoretical Analysis ◽

Absorption Coefficient ◽

Emission Spectroscopy ◽

Molten Salts ◽

Sample Thickness ◽

Thin Sample ◽

Thick Sample ◽

Sample Property ◽

Ir Emission ◽

The Ideal

The IR emittance of liquids relative to a blackbody is dependent on the reflectivity at the surface of the sample. This dependency leads to distortions in the bandshapes except when the absorption coefficient or the sample thickness is very low. The use of an opaque (i.e. very thick) sample as a reference eliminates the distortions in the bandshapes. A new emittance ε* = (emission of a thin sample)/(emission of an opaque sample) has been introduced. A theoretical analysis as well as experimental work on chloroaluminate melts demonstrate that the emittance ε* gives a better representation of the ideal sample property of interest, i.e., the internal transmittance of the sample, than the usual emittance with a blackbody as a reference.

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Koefisien Serap Bunyi Papan Partikel Dari Bahan Serbuk Kayu Kelapa

Jurnal MIPA ◽

10.35799/jm.2.1.2013.961 ◽

2013 ◽

Vol 2 (1) ◽

pp. 56

Author(s):

Thamrin Suhaemi ◽

Seni H. J. Tongkukut ◽

As'ari .

Keyword(s):

Absorption Coefficient ◽

Sound Absorption ◽

Base Material ◽

Sample Thickness ◽

Sound Absorption Coefficient ◽

Wood Dust ◽

Particle Board ◽

Absorption Coefficients ◽

Board Thickness

Telah dilakukan penelitian untuk mengetahui karakteristik koefisien serap bunyi papan partikel dari bahan dasar serbuk kayu kelapa. Papan partikel dibuat dengan mencampur serbuk kayu kelapa dengan tepung kanji, dicetak, dan dikeringkan. Sampel berbentuk silinder, dibuat sebanyak 4 buah dengan tebal : (1,15 cm), (1,95 cm), (2,95 cm) dan (4,05 cm). Nilai koefisien serap bunyi sampel diukur menggunakan alat ukur koefisien serap bunyi. Hasil penelitian menunjukkan, ketebalan sampel mempengaruhi nilai koefisien serap bunyi (α) yaitu pada frekuensi 600 Hz. Koefisien serap bunyi (α) semakin menurun dengan bertambahnya ketebalan papan partikel (sampel penyerap).The research had been doing to know characteristic sound absorption coefficient of particle board which made from base material coconut wood dust. The particle board made by mix of coconut wood dust with cornstarch then pressed and dried. The particle board as a sample is cylinder with diameter 8,5 cm. The thick of four samples are 1,15 cm, 1,95 cm, 2,95 cm, and 4,15 cm. The sound absorption coefficient have measured by sound absorption coefficient instruments. The result is sample thickness has influence to sound absorption coefficient values such as at 600 Hz frequencies. Sound absorption coefficients is decreasing to the increasing of the particle board thickness (absorber sample).

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