Abstract：
:In this study, the effect of density on the velocity of an ultrasonic wave in wood is investigated. The aim of the present study was to analyze the influence of density on the longitudinal velocity of an ultrasonic wave, propagated in the longitudinal direction. Experiments were conducted on 5cm x 5cm x 5cm wood specimens selected from the following species: pinus caribea (Pinus caribea var. caribea), eucalyptus citriodora (Eucalyptus citriodora), eucalyptus grandis (Eucalyptus grandis), cupiúba (Goupia glabra) and jatobá (Hymenaea sp.). The relationship between density and velocity was analyzed in two different manners: between and within species. The results obtained between species indicated that ultrasonic velocity tends to increase with increasing density. The results obtained within species also showed an increasing trend in ultrasonic velocity as density increased, but the relationship was not as significant as it was for between species.
journal_name
Bioresour Technoljournal_title
Bioresource technologyauthors
de Oliveira FG,Sales Adoi
10.1016/j.biortech.2005.04.050subject
Has Abstractpub_date
2006-12-01 00:00:00pages
2443-6issue
18eissn
0960-8524issn
1873-2976pii
S0960-8524(05)00490-6journal_volume
97pub_type
杂志文章abstract：:In this study the biodegradation of polyurethane (PU) during the maturation stage of a commercial composting process was investigated. PU coupons were buried in the centre and at the surface of a 10 m high compost pile. Fungal communities colonising polyester PU coupons were compared with the native compost communitie...
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pub_type： 杂志文章
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更新日期：2011-11-01 00:00:00
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更新日期：2017-11-01 00:00:00
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pub_type： 杂志文章
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更新日期：2020-09-01 00:00:00
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journal_title：Bioresource technology
pub_type： 杂志文章
doi：10.1016/j.biortech.2005.10.023
更新日期：2006-12-01 00:00:00
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更新日期：2018-06-01 00:00:00
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journal_title：Bioresource technology
pub_type： 杂志文章,评审
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更新日期：2010-02-01 00:00:00
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更新日期：2020-12-28 00:00:00
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journal_title：Bioresource technology
pub_type： 杂志文章,评审
doi：10.1016/j.biortech.2011.12.050
更新日期：2012-07-01 00:00:00
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