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Registro Completo |
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Biblioteca(s): |
Embrapa Acre; Embrapa Florestas. |
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Data corrente: |
16/04/2007 |
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Data da última atualização: |
28/07/2021 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
FIGUEIREDO, E. O.; SCOLFORO, J. R. S.; OLIVEIRA, A. D. de. |
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Afiliação: |
EVANDRO ORFANO FIGUEIREDO, CPAF-AC; José Roberto Soares Scolforo, Ufla; Antônio Donizette de Oliveira, Ufla. |
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Título: |
Seleção de modelos polinomiais para representar o perfil e volume do fuste de Tectona grandis L.f. |
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Ano de publicação: |
2006 |
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Fonte/Imprenta: |
Acta Amazonica, Manaus, v. 36, n. 4, p. 465-482, 2006. |
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ISSN: |
0044-5967 (impresso) |
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DOI: |
10.1590/S0044-59672006000400008. |
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Idioma: |
Português |
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Conteúdo: |
A precisão do volume de um povoamento florestal torna-se importante à medida que as empresas florestais integram verticalmente suas atividades e o resíduo da elaboração de um produto torna-se matéria-prima para outros. Os estudos realizados objetivaram avaliar a acurácia dos modelos polinomiais propostos por Schöepfer (1966), Hradetzky (1976) e Goulding & Murray (1976), na estimativa dos diâmetros e volumes ao longo do fuste de Tectona grandis L.f. de quatro povoamentos localizados na microrregião do Baixo Rio Acre e, ainda, testar a identidade do melhor modelo polinomial, avaliando-se a adequação de manter as áreas agrupadas ou segregálas em grupos menores ou individualmente. A base de dados foi constituída de 159 árvores cubadas rigorosamente. Na avaliação da acurácia dos modelos foram empregadas estatísticas de desvio médio, desvio padrão das diferenças, soma dos quadrados dos resíduos relativos e resíduos percentuais. O modelo Goulding & Murray (1976) gerou as melhores estimativas de diâmetros e volumes ao longo do fuste, seguido pelos modelos Hradetzky (1976) e Schöepfer (1966). O teste de identidade de modelo mostrou ser mais adequado realizar ajustes independentes para as áreas 1 e 4 e para o subgrupo 2 e 3. |
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Palavras-Chave: |
Acrelândia (AC); Acurácia; Amazônia Ocidental; Baixo rio Acre; Função de afilamento; Fuste; Medidas del árbol y del rodal; Modelo polinomial; Modelos matemáticos; Polynomial model; Rio Branco (AC); Tapering function; Teak; Volumetria. |
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Thesagro: |
Diâmetro; Estimativa; Modelo matemático; Planejamento florestal; População de planta; Teca; Tectona Grandis; Volume. |
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Thesaurus Nal: |
Mathematical models; Tree and stand measurements. |
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Categoria do assunto: |
--
K Ciência Florestal e Produtos de Origem Vegetal |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/112657/1/15194.pdf
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Marc: |
LEADER 02578naa a2200457 a 4500
001 1506318
005 2021-07-28
008 2006 bl uuuu u00u1 u #d
022 $a0044-5967 (impresso)
024 7 $a10.1590/S0044-59672006000400008.$2DOI
100 1 $aFIGUEIREDO, E. O.
245 $aSeleção de modelos polinomiais para representar o perfil e volume do fuste de Tectona grandis L.f.
260 $c2006
520 $aA precisão do volume de um povoamento florestal torna-se importante à medida que as empresas florestais integram verticalmente suas atividades e o resíduo da elaboração de um produto torna-se matéria-prima para outros. Os estudos realizados objetivaram avaliar a acurácia dos modelos polinomiais propostos por Schöepfer (1966), Hradetzky (1976) e Goulding & Murray (1976), na estimativa dos diâmetros e volumes ao longo do fuste de Tectona grandis L.f. de quatro povoamentos localizados na microrregião do Baixo Rio Acre e, ainda, testar a identidade do melhor modelo polinomial, avaliando-se a adequação de manter as áreas agrupadas ou segregálas em grupos menores ou individualmente. A base de dados foi constituída de 159 árvores cubadas rigorosamente. Na avaliação da acurácia dos modelos foram empregadas estatísticas de desvio médio, desvio padrão das diferenças, soma dos quadrados dos resíduos relativos e resíduos percentuais. O modelo Goulding & Murray (1976) gerou as melhores estimativas de diâmetros e volumes ao longo do fuste, seguido pelos modelos Hradetzky (1976) e Schöepfer (1966). O teste de identidade de modelo mostrou ser mais adequado realizar ajustes independentes para as áreas 1 e 4 e para o subgrupo 2 e 3.
650 $aMathematical models
650 $aTree and stand measurements
650 $aDiâmetro
650 $aEstimativa
650 $aModelo matemático
650 $aPlanejamento florestal
650 $aPopulação de planta
650 $aTeca
650 $aTectona Grandis
650 $aVolume
653 $aAcrelândia (AC)
653 $aAcurácia
653 $aAmazônia Ocidental
653 $aBaixo rio Acre
653 $aFunção de afilamento
653 $aFuste
653 $aMedidas del árbol y del rodal
653 $aModelo polinomial
653 $aModelos matemáticos
653 $aPolynomial model
653 $aRio Branco (AC)
653 $aTapering function
653 $aTeak
653 $aVolumetria
700 1 $aSCOLFORO, J. R. S.
700 1 $aOLIVEIRA, A. D. de
773 $tActa Amazonica, Manaus$gv. 36, n. 4, p. 465-482, 2006.
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Registro original: |
Embrapa Acre (CPAF-AC) |
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Registro Completo
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Biblioteca(s): |
Embrapa Pecuária Sudeste. |
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Data corrente: |
10/11/2010 |
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Data da última atualização: |
19/07/2011 |
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Tipo da produção científica: |
Resumo em Anais de Congresso |
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Autoria: |
CARAPELLI, R.; GUERRA, M. B. B.; MIRANDA, K. dos A. de; PEREIRA FILHO, E. R.; NOGUEIRA, A. R. de A. |
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Afiliação: |
RODOLFO CARAPELLI, UFSCar/SÃO CARLOS, SP; MARCELO BRAGA BUENO GUERRA, UFSCar/SÃO CARLOS, SP; KELBER DOS ANJOS DE MIRANDA, UFSCar/SÃO CARLOS, SP; EDENIR RODRIGUES PEREIRA FILHO, UFSCar/SÃO CARLOS, SP; ANA RITA DE ARAUJO NOGUEIRA, CPPSE. |
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Título: |
Potentialities of hydride generation atomic absorption spectrometry (HGAAS) in the fast sequential determination of AS, BI and SB. |
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Ano de publicação: |
2010 |
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Fonte/Imprenta: |
In: RIO SYMPOSIUM ON ATOMIC SPECTROMETRY, 11., 2010, Mar del Prata: Horiba, 2010. |
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Páginas: |
p. 169 |
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Idioma: |
Português |
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Conteúdo: |
In this study, a sensitive hydride generation method was combined with fast sequential flame atomic absorption spectrometry (FS-FAAS) for the sequential determination of As, Bi and Sb in water samples. A Doehlert design was performed to identify a compromise condition to determine sequentially the three elements. The best condition was reached using NaBH40.8 % mv-1as the reducing agent. Another four variables were also tested: HCI concentration as the carrier solution (2 to 10 mol L-1), KI concentration as the pre-reductor solution (1 to 7 % mv-1), employment of ascorbic acid (0 to 6 % mv-1) as auxiliary pre-reductor, and integration time (3 replicates of 0.5 to 2 s). All these evaluated conditions were not significant at the investigated levels. Therefore, the optimized parameters were: HCI 6 mol L-1 in order to avoid interferences from the matrix, KI 1 % mv-1 without ascorbic acid to reduce reagent consumption and waste generation, finally, because of the lower delay time (20s) of the measurements, integration time of 1 s with 5 replicates was employed to precision improvement. That delay time was chosen as the minimum time to signal stabilization after the entire signal profile examination. The linear ranges were from 0.5 to 1 0 ~g L-1 of As, Bi and Sb. The accuracy of the proposed method was checked using two Certified Reference Materials (CRM) related with trace metals in water, HPS-TMDW and NIST 1643e. The results obtained for both CRM were in agreement with the certified value, with the following recoveries: As (average of 76%), Bi (average of 104%), Sb (average of 89 %).The proposed method has several advantages for routine analysis of As, Bi and Sb in water such as: good sensitivity (LaD: 0.132mg L- 1for As, 0.088mg L-1for Bi and 0.110mg L-1for Sb; n=10), high analytical throughput (270 determinations per hour), and low reagent consumption when compared with single elements determinations. MenosIn this study, a sensitive hydride generation method was combined with fast sequential flame atomic absorption spectrometry (FS-FAAS) for the sequential determination of As, Bi and Sb in water samples. A Doehlert design was performed to identify a compromise condition to determine sequentially the three elements. The best condition was reached using NaBH40.8 % mv-1as the reducing agent. Another four variables were also tested: HCI concentration as the carrier solution (2 to 10 mol L-1), KI concentration as the pre-reductor solution (1 to 7 % mv-1), employment of ascorbic acid (0 to 6 % mv-1) as auxiliary pre-reductor, and integration time (3 replicates of 0.5 to 2 s). All these evaluated conditions were not significant at the investigated levels. Therefore, the optimized parameters were: HCI 6 mol L-1 in order to avoid interferences from the matrix, KI 1 % mv-1 without ascorbic acid to reduce reagent consumption and waste generation, finally, because of the lower delay time (20s) of the measurements, integration time of 1 s with 5 replicates was employed to precision improvement. That delay time was chosen as the minimum time to signal stabilization after the entire signal profile examination. The linear ranges were from 0.5 to 1 0 ~g L-1 of As, Bi and Sb. The accuracy of the proposed method was checked using two Certified Reference Materials (CRM) related with trace metals in water, HPS-TMDW and NIST 1643e. The results obtained for both CRM were in agreement with the certif... Mostrar Tudo |
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Palavras-Chave: |
Atomic absorption; BS, BI, SB; Spectrometry (HAAGS). |
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Categoria do assunto: |
W Química e Física |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/37794/1/PROCI-2010.00197.pdf
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Marc: |
LEADER 02611nam a2200205 a 4500
001 1866644
005 2011-07-19
008 2010 bl uuuu u00u1 u #d
100 1 $aCARAPELLI, R.
245 $aPotentialities of hydride generation atomic absorption spectrometry (HGAAS) in the fast sequential determination of AS, BI and SB.
260 $aIn: RIO SYMPOSIUM ON ATOMIC SPECTROMETRY, 11., 2010, Mar del Prata: Horiba$c2010
300 $ap. 169
520 $aIn this study, a sensitive hydride generation method was combined with fast sequential flame atomic absorption spectrometry (FS-FAAS) for the sequential determination of As, Bi and Sb in water samples. A Doehlert design was performed to identify a compromise condition to determine sequentially the three elements. The best condition was reached using NaBH40.8 % mv-1as the reducing agent. Another four variables were also tested: HCI concentration as the carrier solution (2 to 10 mol L-1), KI concentration as the pre-reductor solution (1 to 7 % mv-1), employment of ascorbic acid (0 to 6 % mv-1) as auxiliary pre-reductor, and integration time (3 replicates of 0.5 to 2 s). All these evaluated conditions were not significant at the investigated levels. Therefore, the optimized parameters were: HCI 6 mol L-1 in order to avoid interferences from the matrix, KI 1 % mv-1 without ascorbic acid to reduce reagent consumption and waste generation, finally, because of the lower delay time (20s) of the measurements, integration time of 1 s with 5 replicates was employed to precision improvement. That delay time was chosen as the minimum time to signal stabilization after the entire signal profile examination. The linear ranges were from 0.5 to 1 0 ~g L-1 of As, Bi and Sb. The accuracy of the proposed method was checked using two Certified Reference Materials (CRM) related with trace metals in water, HPS-TMDW and NIST 1643e. The results obtained for both CRM were in agreement with the certified value, with the following recoveries: As (average of 76%), Bi (average of 104%), Sb (average of 89 %).The proposed method has several advantages for routine analysis of As, Bi and Sb in water such as: good sensitivity (LaD: 0.132mg L- 1for As, 0.088mg L-1for Bi and 0.110mg L-1for Sb; n=10), high analytical throughput (270 determinations per hour), and low reagent consumption when compared with single elements determinations.
653 $aAtomic absorption
653 $aBS, BI, SB
653 $aSpectrometry (HAAGS)
700 1 $aGUERRA, M. B. B.
700 1 $aMIRANDA, K. dos A. de
700 1 $aPEREIRA FILHO, E. R.
700 1 $aNOGUEIRA, A. R. de A.
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Embrapa Pecuária Sudeste (CPPSE) |
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