{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,13]],"date-time":"2026-04-13T05:08:09Z","timestamp":1776056889187,"version":"3.50.1"},"reference-count":9,"publisher":"CSIRO Publishing","issue":"1","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2004,4,8]]},"abstract":"<jats:p>. The standard formula used to estimate the radiation extinction coefficient, kb (m\u20131), of solid porous natural fuel beds is examined and tested against laboratory experiments with isotropic beds of pine needles in the range of packing ratio, \u03b2, of 0.01\u20130.02. To measure kb in the tests, a setup using a parallel beam of white light radiation was constructed. The error of the standard formula is observed to be smaller than 10%. Similar tests were performed for a non-isotropic bed of pine needles with \u03b2 \u2248 0.02, in which the maximum angle of inclination of the needles was limited to 30\u00b0, for two directions of incidence of radiation: horizontal and vertical. For each one of these two cases, original estimation formulae for kb are proposed alternative to the standard one. In these cases it is concluded that, while the standard formula may be in error by up to 20%, the new formulae have errors around 5% or smaller.<\/jats:p>","DOI":"10.1071\/wf03009","type":"journal-article","created":{"date-parts":[[2004,4,8]],"date-time":"2004-04-08T02:35:51Z","timestamp":1081391751000},"page":"65-71","source":"Crossref","is-referenced-by-count":12,"title":["Estimation of the radiation extinction coefficient of natural fuel beds"],"prefix":"10.1071","volume":"13","author":[{"given":"Gilberto C.","family":"Vaz","sequence":"first","affiliation":[{"name":"ADepartment of Mechanical Engineering, ISEC\u2013Polytechnic Institute of Coimbra, Rua Pedro Nunes\u2013Quinta da Nora, 3030-199 Coimbra, Portugal."}]},{"given":"Jorge C. S.","family":"Andr\u00e9","sequence":"additional","affiliation":[{"name":"BDepartment of Mechanical Engineering, Faculty of Sciences and Technology, University of Coimbra, P\u00f3lo II, Pinhal de Marrocos, 3030-201 Coimbra, Portugal."},{"name":"CCorresponding author. Telephone: +351 239 790 728\/732; fax: +351 239 790 771; email: jorge.andre@dem.uc.pt"}]},{"given":"Domingos X.","family":"Viegas","sequence":"additional","affiliation":[{"name":"BDepartment of Mechanical Engineering, Faculty of Sciences and Technology, University of Coimbra, P\u00f3lo II, Pinhal de Marrocos, 3030-201 Coimbra, Portugal."}]}],"member":"67","published-online":{"date-parts":[[2004,4,8]]},"reference":[{"key":"2025112621132924300_R1"},{"key":"2025112621132924300_R2"},{"key":"2025112621132924300_R3","unstructured":"Andr\u00e9     JCS              1996      A theory on the propagation of surface forest fire fronts.   PhD thesis, Mechanical Engineering Department         University of Coimbra   Portugal      [In Portuguese]"},{"key":"2025112621132924300_R4","unstructured":"Butler     BW              1993      Experimental measurements of radiant heat fluxes from simulated wildfire flames.   Proceedings of the 12th Conference on Fire and Forest Meteorology             104   111             Society of American Foresters    Bethesda, MD"},{"key":"2025112621132924300_R5"},{"key":"2025112621132924300_R6"},{"key":"2025112621132924300_R7","unstructured":"Fang     JB              1969      An investigation of the effect of controlled wind on the rate of fire spread.   Ph.D. Thesis         Chemical Engineering Department, University of New Brunswick   Canada"},{"key":"2025112621132924300_R8"},{"key":"2025112621132924300_R9"}],"container-title":["International Journal of Wildland Fire"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/connectsci.au\/wf\/article-pdf\/13\/1\/65\/156494\/wf03009.pdf","content-type":"application\/pdf","content-version":"vor","intended-application":"syndication"},{"URL":"https:\/\/connectsci.au\/wf\/article-pdf\/13\/1\/65\/156494\/wf03009.pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,11,27]],"date-time":"2025-11-27T02:13:34Z","timestamp":1764209614000},"score":1,"resource":{"primary":{"URL":"https:\/\/connectsci.au\/wf\/article\/13\/1\/65\/22646\/Estimation-of-the-radiation-extinction-coefficient"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2004,4,8]]},"references-count":9,"journal-issue":{"issue":"1","published-print":{"date-parts":[[2004,4,8]]}},"URL":"https:\/\/doi.org\/10.1071\/wf03009","relation":{},"ISSN":["1049-8001","1448-5516"],"issn-type":[{"value":"1049-8001","type":"print"},{"value":"1448-5516","type":"electronic"}],"subject":[],"published":{"date-parts":[[2004,4,8]]}}}