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Registro Completo |
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Biblioteca(s): |
Embrapa Florestas. |
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Data corrente: |
06/06/1995 |
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Data da última atualização: |
04/05/2009 |
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Autoria: |
SOUZA, A. L. de. |
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Título: |
Comparação de tipos de amostragens, com parcelas circulares de area fixa e variável, em povamentos de Eucalyptus grandis de origem híbrida, cultivados na Região de Bom Despacho, Minas Gerais. |
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Ano de publicação: |
1981 |
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Fonte/Imprenta: |
1981. |
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Páginas: |
97 f. |
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Idioma: |
Português |
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Notas: |
Tese (Magister Scientiae) - Curso de Pós-Graduação em Ciência Florestal, Universidade Federal de Viçosa, Viçosa. |
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Conteúdo: |
Doze parcelas circulares concentricas, para tamanhos de 100 a 1000m2, a intervalos de 100m2, e 30 pontos de estacao, inventariados com os seguintes fatores de area basal, k=9/16, 1, 25/16, 2, 34/16, 49,16 e 4, do Relascopio de Espelho de Bitterlich, foram casualmente selecionados em mapas de 3 areas de 2ha de Eucalyptus grandis, com 5,2 anos de idade. Essas areas foram escolhidas em 3 talhoes de +-50ha, representativos dos plantios dessa especie na regiao de Bom Despacho, e amostradas 100%, constituindo a populacao-base, de 6ha, deste estudo. As estimativas do volume/ha e do numero de arvores/ha, por classe de DAP, foram submetidas as analises de variancia, precisao e exatidao. Verificou-se que o melhor tamanho de parcela circular foi o de 500 ou de 600m2, eque o fator k=1 foi o que melhor representou a populacao, em termos de estrutura e densidade, fornecendo valores medios estimados/ha mais precisos e exatos, nas diferentes classes de DAP. Com base nas analises estabelecidas, calculou-se a eficiencia relativa dos dois tipos. |
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Thesagro: |
Amostragem; Eucalyptus Grandis; Parcela; Povoamento Florestal. |
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Thesaurus Nal: |
sampling. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01759nam a2200193 a 4500
001 1304378
005 2009-05-04
008 1981 bl uuuu m 00u1 u #d
100 1 $aSOUZA, A. L. de
245 $aComparação de tipos de amostragens, com parcelas circulares de area fixa e variável, em povamentos de Eucalyptus grandis de origem híbrida, cultivados na Região de Bom Despacho, Minas Gerais.
260 $a1981.$c1981
300 $a97 f.
500 $aTese (Magister Scientiae) - Curso de Pós-Graduação em Ciência Florestal, Universidade Federal de Viçosa, Viçosa.
520 $aDoze parcelas circulares concentricas, para tamanhos de 100 a 1000m2, a intervalos de 100m2, e 30 pontos de estacao, inventariados com os seguintes fatores de area basal, k=9/16, 1, 25/16, 2, 34/16, 49,16 e 4, do Relascopio de Espelho de Bitterlich, foram casualmente selecionados em mapas de 3 areas de 2ha de Eucalyptus grandis, com 5,2 anos de idade. Essas areas foram escolhidas em 3 talhoes de +-50ha, representativos dos plantios dessa especie na regiao de Bom Despacho, e amostradas 100%, constituindo a populacao-base, de 6ha, deste estudo. As estimativas do volume/ha e do numero de arvores/ha, por classe de DAP, foram submetidas as analises de variancia, precisao e exatidao. Verificou-se que o melhor tamanho de parcela circular foi o de 500 ou de 600m2, eque o fator k=1 foi o que melhor representou a populacao, em termos de estrutura e densidade, fornecendo valores medios estimados/ha mais precisos e exatos, nas diferentes classes de DAP. Com base nas analises estabelecidas, calculou-se a eficiencia relativa dos dois tipos.
650 $asampling
650 $aAmostragem
650 $aEucalyptus Grandis
650 $aParcela
650 $aPovoamento Florestal
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Registro original: |
Embrapa Florestas (CNPF) |
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Registro Completo
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Biblioteca(s): |
Embrapa Instrumentação. |
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Data corrente: |
10/11/2023 |
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Data da última atualização: |
15/01/2024 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
CONCEIÇÃO, L. R. B. da; CUNHA. H. O. da; LEITE, A. M. B.; BABU, R. S.; RAJA, S.; OLIVEIRA, C. R. de; BARROS, A. L. F. de. |
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Afiliação: |
Centro Federal de Educação Tecnológica Celso Suckow da Fonseca; Centro Federal de Educação Tecnológica Celso Suckow da Fonseca; Centro Federal de Educação Tecnológica Celso Suckow da Fonseca; Centro Federal de Educação Tecnológica Celso Suckow da Fonseca; Federal University of São Carlos (UFSCar); CAUE RIBEIRO DE OLIVEIRA, CNPDIA; Centro Federal de Educação Tecnológica Celso Suckow da Fonseca. |
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Título: |
Evaluation of Solar Conversion Efficiency in Dye-sensitized Solar Cells Using Natural Dyes Extracted from Alpinia purpurata and Alstroemeria Flower Petals as Novel Photosensitizers. |
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Ano de publicação: |
2023 |
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Fonte/Imprenta: |
Colorants, v. 2, 2023. |
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Páginas: |
618 - 631 |
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DOI: |
https://doi.org/10.3390/colorants2040032 |
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Idioma: |
Inglês |
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Conteúdo: |
bstract: Herein, we evaluate the conversion efficiency of dye-sensitized solar cells (DSSCs) photosensitized using two different natural dyes extracted from Alpinia purpurata and Alstroemeria flower petals. The appreciable absorption capacity of the extracts in the visible light region was examined through absorption spectroscopy. The functional groups of the corresponding pigments were identified through Fourier transform spectroscopy (FTIR) technique thus indicating the presence of cyanidin 3-glycosides and piperine in the flowers of Alstroemeria and Alpinia purpurata. The extracted dyes were immobilized on TiO2 on transparent conducting FTO glass, which were used as photoanode. The dye-coated TiO2 photoanode, pt photocathode and iodide/triiodide redox electrolyte assembled into a cell module was illuminated by a light source intensity 100 mW/cm2 to measure the photovoltaic conversion efficiency of DSSCs. The TiO2 anode and Pt counter electrode surface roughness and morphological studies were evaluated using atomic force microscope (AFM) and field emission scanning electron microscopy (FESEM), respectively. Through the photoelectric characterizations, it was promising to verify that the solar conversion efficiency was calculated with the photovoltaic cell sensitized by Alstroemeria and Alpinia purpurata. This was achieved with a yield (η) of 1.74% and 0.65%, with an open-circuit voltage (Voc) of 0.39 and 0.53 V, short-circuit current density (Jsc) of 2.04 and 0.49 mA/cm2 , fill factor (FF) of 0.35 and 0.40, and Pmax of 0.280 and 0.100 mW/cm2 respectively. The results are promising and demonstrate the importance of the search for new natural dyes to be used in organic solar cells for the development of devices that generate electricity in a sustainable way. Menosbstract: Herein, we evaluate the conversion efficiency of dye-sensitized solar cells (DSSCs) photosensitized using two different natural dyes extracted from Alpinia purpurata and Alstroemeria flower petals. The appreciable absorption capacity of the extracts in the visible light region was examined through absorption spectroscopy. The functional groups of the corresponding pigments were identified through Fourier transform spectroscopy (FTIR) technique thus indicating the presence of cyanidin 3-glycosides and piperine in the flowers of Alstroemeria and Alpinia purpurata. The extracted dyes were immobilized on TiO2 on transparent conducting FTO glass, which were used as photoanode. The dye-coated TiO2 photoanode, pt photocathode and iodide/triiodide redox electrolyte assembled into a cell module was illuminated by a light source intensity 100 mW/cm2 to measure the photovoltaic conversion efficiency of DSSCs. The TiO2 anode and Pt counter electrode surface roughness and morphological studies were evaluated using atomic force microscope (AFM) and field emission scanning electron microscopy (FESEM), respectively. Through the photoelectric characterizations, it was promising to verify that the solar conversion efficiency was calculated with the photovoltaic cell sensitized by Alstroemeria and Alpinia purpurata. This was achieved with a yield (η) of 1.74% and 0.65%, with an open-circuit voltage (Voc) of 0.39 and 0.53 V, short-circuit current density (Jsc) of 2.04 and 0.49 mA/... Mostrar Tudo |
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Palavras-Chave: |
Dye-sensitized solar cells; Photosensitizers; Photovoltaics; Renewable energy. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/doc/1158222/1/P-Evaluation-of-Solar-Conversion-Efficiency-in-Dye-sensitized-Solar.pdf
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Marc: |
LEADER 02669naa a2200265 a 4500
001 2158222
005 2024-01-15
008 2023 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.3390/colorants2040032$2DOI
100 1 $aCONCEIÇÃO, L. R. B. da
245 $aEvaluation of Solar Conversion Efficiency in Dye-sensitized Solar Cells Using Natural Dyes Extracted from Alpinia purpurata and Alstroemeria Flower Petals as Novel Photosensitizers.$h[electronic resource]
260 $c2023
300 $a618 - 631
520 $abstract: Herein, we evaluate the conversion efficiency of dye-sensitized solar cells (DSSCs) photosensitized using two different natural dyes extracted from Alpinia purpurata and Alstroemeria flower petals. The appreciable absorption capacity of the extracts in the visible light region was examined through absorption spectroscopy. The functional groups of the corresponding pigments were identified through Fourier transform spectroscopy (FTIR) technique thus indicating the presence of cyanidin 3-glycosides and piperine in the flowers of Alstroemeria and Alpinia purpurata. The extracted dyes were immobilized on TiO2 on transparent conducting FTO glass, which were used as photoanode. The dye-coated TiO2 photoanode, pt photocathode and iodide/triiodide redox electrolyte assembled into a cell module was illuminated by a light source intensity 100 mW/cm2 to measure the photovoltaic conversion efficiency of DSSCs. The TiO2 anode and Pt counter electrode surface roughness and morphological studies were evaluated using atomic force microscope (AFM) and field emission scanning electron microscopy (FESEM), respectively. Through the photoelectric characterizations, it was promising to verify that the solar conversion efficiency was calculated with the photovoltaic cell sensitized by Alstroemeria and Alpinia purpurata. This was achieved with a yield (η) of 1.74% and 0.65%, with an open-circuit voltage (Voc) of 0.39 and 0.53 V, short-circuit current density (Jsc) of 2.04 and 0.49 mA/cm2 , fill factor (FF) of 0.35 and 0.40, and Pmax of 0.280 and 0.100 mW/cm2 respectively. The results are promising and demonstrate the importance of the search for new natural dyes to be used in organic solar cells for the development of devices that generate electricity in a sustainable way.
653 $aDye-sensitized solar cells
653 $aPhotosensitizers
653 $aPhotovoltaics
653 $aRenewable energy
700 1 $aCUNHA. H. O. da
700 1 $aLEITE, A. M. B.
700 1 $aBABU, R. S.
700 1 $aRAJA, S.
700 1 $aOLIVEIRA, C. R. de
700 1 $aBARROS, A. L. F. de
773 $tColorants$gv. 2, 2023.
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Embrapa Instrumentação (CNPDIA) |
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