The Experts below are selected from a list of 462 Experts worldwide ranked by ideXlab platform

Selma Elaine Mazzetto - One of the best experts on this subject based on the ideXlab platform.

  • Superparamagnetic nano-biocomposites for application as dielectric resonator antennas
    Materials Chemistry and Physics, 2017
    Co-Authors: André Leandro Da Silva, Lucas Renan Rocha Da Silva, Isabelle De Andrade Camargo, Deuber Lincon Da Silva Agostini, Derval Dos Santos Rosa, Diego Lomonaco Vasconcelos De Oliveira, Pierre Basílio Almeida Fechine, Juliano C. Denardin, Giuseppe Mele, Selma Elaine Mazzetto
    Abstract:

    Abstract There is a growing global interest for the development of green technologies that allow the use of products with less damage to environment, as well as for maximum and sustainable use of natural resources. The main aim of this study was to develop superparamagnetic nano-biocomposites for application as dielectric resonator antennas, from a combination of a cardanol-based thermoset plastic, chemically modified Sponge Gourd fibers (NaOH 10% and NaClO 1 wt%), and magnetite nanoparticles in different contents (1, 5, and 10 wt%). The magnetite particles exhibited nanometric size, high purity and crystallinity, and superparamagnetic character. All nano-biocomposites showed superparamagnetic behavior, excellent thermal stability, good biodegradation rates, and better mechanical strength for the material with magnetite 10 wt%. All dielectric resonator antennas showed satisfactory return loss and suitability for technological applications, especially for performance in broadband.

  • Cardanol-based thermoset plastic reinforced by Sponge Gourd fibers (Luffa cylindrica)
    Associação Brasileira de Polímeros, 2016
    Co-Authors: André Leandro Da Silva, Lucas Renan Rocha Da Silva, Isabelle De Andrade Camargo, Deuber Lincon Da Silva Agostini, Derval Dos Santos Rosa, Diego Lomonaco Vasconcelos De Oliveira, Pierre Basílio Almeida Fechine, Selma Elaine Mazzetto
    Abstract:

    Abstract A growing global trend for maximum use of natural resources through new processes and products has enhanced studies and exploration of renewable natural materials. In this study, cardanol, a component of the cashew nut shell liquid (CNSL), was used as a building block for the development of a thermosetting matrix, which was reinforced by raw and modified Sponge Gourd fibers (Luffa cylindrica). DSC and TG results showed that among biocomposites, the one reinforced by Sponge Gourd fibers treated with NaOH 10 wt% (BF10) had the highest thermal stability, besides the best performance in the Tensile testing, showing good incorporation, dispersion, and adhesion to polymer matrix, observed by SEM. After 80 days of simulated soil experiments, it has been discovered that the presence of treated fiber allowed better biodegradability behavior to biocomposites. The biobased thermoset plastic and biocomposites showed a good potential to several applications, such as manufacturing of articles for furniture and automotive industries, especially BF10

K G Satyanarayana - One of the best experts on this subject based on the ideXlab platform.

  • characterization of banana sugarcane bagasse and Sponge Gourd fibers of brazil
    Industrial Crops and Products, 2009
    Co-Authors: J L Guimaraes, Elisabete Frollini, C G Da Silva, Fernando Wypych, K G Satyanarayana
    Abstract:

    Abstract In recent times, increasing attention has been paid to the use of renewable resources particularly of plant origin keeping in view the ecological concerns, renewability and many governments passing laws for the use of such materials. On the other hand, despite abundant availability of lignocellulosic materials in Brazil, very few attempts have been made about their utilization, probably due to lack of sufficient structure/property data. Systematic studies to know their properties and morphology may bridge this gap while leading to value addition to these natural materials. Chemical composition, X-ray powder diffraction, and morphological studies and thermal behavior aspects in respect of banana, sugarcane bagasse Sponge Gourd fibers of Brazilian origin are presented. Chemical compositions of the three fibers are found to be different than those reported earlier. X-ray diffraction patterns of these three fibers exhibit mainly cellulose type I structure with the crystallinity indices of 39%, 48% and 50% respectively for these fibers. Morphological studies of the fibers revealed different sizes and arrangement of cells. Thermal stability of all the fibers is found to be around 200 °C. Decomposition of both cellulose and hemicelluloses in the fibers takes place at 300 °C and above, while the degradation of fibers takes place above 400 °C. These data may help finding new uses for these fibers.

Yubing Huang - One of the best experts on this subject based on the ideXlab platform.

  • age stage two sex life tables of bactrocera cucurbitae coquillett diptera tephritidae with a discussion on the problem of applying female age specific life tables to insect populations
    Insect Science, 2012
    Co-Authors: Yubing Huang
    Abstract:

    Age-stage, two-sex life tables of the melon fly, Bactrocera cucurbitae (Coquil- lett) (Diptera: Tephritidae), reared on cucumber (Cucumis sativus L.), Sponge Gourd (Luffa cylindrica Roem) and a carrot medium (mashed Daucus carota L. mixed with sucrose and yeast hydrolysate) were constructed under laboratory conditions at 25 ± 1 ◦ C, 65% ± 0.5% relative humidity, and a photoperiod 12 : 12h (L : D). The intrinsic rates of increase of B. cucurbitae were 0.1446, 0.1412 and 0.0688 days on cucumber, Sponge Gourd, and car- rotmedium,respectively.Thehighestnetreproductionratewas172offspringperflyreared on Sponge Gourd. The mean generation times of B. cucurbitae ranged from 34 days reared on cucumber to 56 days reared on carrot medium. The life history raw data was analyzed using the traditional female age-specific life table and compared to results obtained using the age-stage, two-sex life table. When the age-specific female life table is applied to an age-stage-structured two-sex population, survival and fecundity curves will be improperly manipulated due to an inability to include variation in preadult development time. We discussed different interpretations of the relationship between the net reproductive rate and the intrinsic rate of increase to clarify possible misunderstanding in the literature.

  • assessing the application of the jackknife and bootstrap techniques to the estimation of the variability of the net reproductive rate and gross reproductive rate a case study in bactrocera cucurbitae coquillett diptera tephritidae
    農林學報, 2012
    Co-Authors: Yubing Huang
    Abstract:

    In the study of life tables, scientists usually begin with a single cohort and record survival, development, and fecundity until the death of all individuals. Because it is extremely timeconsuming, the replication of life table studies is generally impractical. To estimate the variability of life table statistics, jackknife and bootstrap techniques are usually used. However, the biological meaning of these statistical procedures is not yet fully understood. In this paper, we assessed the use of the jackknife and the bootstrap in estimating the variability of the net reproductive rate and gross reproductive rate. Life table data for the melon fly, Bactrocera cucurbitae (Diptera: Tephritidae) reared on cucumber, Sponge Gourd, and carrot medium were used as examples. Our results show that the jackknife is inadequate for the estimation of the variability of both the net reproductive rate and gross reproductive rate and may overestimate the variability.

André Leandro Da Silva - One of the best experts on this subject based on the ideXlab platform.

  • Superparamagnetic nano-biocomposites for application as dielectric resonator antennas
    Materials Chemistry and Physics, 2017
    Co-Authors: André Leandro Da Silva, Lucas Renan Rocha Da Silva, Isabelle De Andrade Camargo, Deuber Lincon Da Silva Agostini, Derval Dos Santos Rosa, Diego Lomonaco Vasconcelos De Oliveira, Pierre Basílio Almeida Fechine, Juliano C. Denardin, Giuseppe Mele, Selma Elaine Mazzetto
    Abstract:

    Abstract There is a growing global interest for the development of green technologies that allow the use of products with less damage to environment, as well as for maximum and sustainable use of natural resources. The main aim of this study was to develop superparamagnetic nano-biocomposites for application as dielectric resonator antennas, from a combination of a cardanol-based thermoset plastic, chemically modified Sponge Gourd fibers (NaOH 10% and NaClO 1 wt%), and magnetite nanoparticles in different contents (1, 5, and 10 wt%). The magnetite particles exhibited nanometric size, high purity and crystallinity, and superparamagnetic character. All nano-biocomposites showed superparamagnetic behavior, excellent thermal stability, good biodegradation rates, and better mechanical strength for the material with magnetite 10 wt%. All dielectric resonator antennas showed satisfactory return loss and suitability for technological applications, especially for performance in broadband.

  • Cardanol-based thermoset plastic reinforced by Sponge Gourd fibers (Luffa cylindrica)
    Associação Brasileira de Polímeros, 2016
    Co-Authors: André Leandro Da Silva, Lucas Renan Rocha Da Silva, Isabelle De Andrade Camargo, Deuber Lincon Da Silva Agostini, Derval Dos Santos Rosa, Diego Lomonaco Vasconcelos De Oliveira, Pierre Basílio Almeida Fechine, Selma Elaine Mazzetto
    Abstract:

    Abstract A growing global trend for maximum use of natural resources through new processes and products has enhanced studies and exploration of renewable natural materials. In this study, cardanol, a component of the cashew nut shell liquid (CNSL), was used as a building block for the development of a thermosetting matrix, which was reinforced by raw and modified Sponge Gourd fibers (Luffa cylindrica). DSC and TG results showed that among biocomposites, the one reinforced by Sponge Gourd fibers treated with NaOH 10 wt% (BF10) had the highest thermal stability, besides the best performance in the Tensile testing, showing good incorporation, dispersion, and adhesion to polymer matrix, observed by SEM. After 80 days of simulated soil experiments, it has been discovered that the presence of treated fiber allowed better biodegradability behavior to biocomposites. The biobased thermoset plastic and biocomposites showed a good potential to several applications, such as manufacturing of articles for furniture and automotive industries, especially BF10

Satyanarayana K. G. - One of the best experts on this subject based on the ideXlab platform.

  • Sponge Gourd (Luffa Cylindrica) Reinforced Polyester Composites: Preparation and Properties
    'Defence Scientific Information and Documentation Centre', 2014
    Co-Authors: Tanobe, Valcineide O.a., Flores-sahagun, Thais H.s., Amico, Sandro C., Muniz, Graciela I.b., Satyanarayana K. G.
    Abstract:

    Increasing environmental concern along with the drive to find substitutes for synthetic fibers and value added applications for low cost and renewable plant fibers have led to the development of composites based on biomaterials. One of the drawbacks encountered in such exercise is the lack of adhesion between the incorporated plant fibers and synthetic polymeric matrices. Such drawback can be reduced by appropriate treatment of fibers. This paper describes the chemical treatments used on Sponge Gourd (Luffa cylindrica) fibers of Brazil to prepare their composites with polyester resin. Production of short fiber-polymer composite as well as mat-polyester composites is presented here. Characterization of the composites in respect of evaluation of density, water absorption, thermalstability, tensile properties and impact strength were made and the results are discussed. Observed impact strengthand tensile properties are discussed based on the fractographic studies of the composites.Defence Science Journal, Vol. 64, No. 3, May 2014, pp. 273-280, DOI:http://dx.doi.org/ 10.14429/dsj.64.732

  • Characterization of banana, sugarcane bagasse and Sponge Gourd fibers of Brazil
    ELSEVIER SCIENCE BV, 2009
    Co-Authors: Guimaraes J. L., C G Da Silva, Frollini E., Wypych F., Satyanarayana K. G.
    Abstract:

    In recent times, increasing attention has been paid to the use of renewable resources particularly of plant origin keeping in view the ecological concerns, renewability and many governments passing laws for the use of such materials. On the other hand, despite abundant availability of lignocellulosic materials in Brazil, very few attempts have been made about their utilization, probably due to lack of sufficient structure/property data. Systematic studies to know their properties and morphology may bridge this gap while leading to value addition to these natural materials. Chemical composition, X-ray powder diffraction, and morphological studies and thermal behavior aspects in respect of banana, sugarcane bagasse Sponge Gourd fibers of Brazilian origin are presented. Chemical compositions of the three fibers are found to be different than those reported earlier. X-ray diffraction patterns of these three fibers exhibit mainly cellulose type I structure with the crystallinity indices of 39%, 48% and 50% respectively for these fibers. Morphological studies of the fibers revealed different sizes and arrangement of cells. Thermal stability of all the fibers is found to be around 200 degrees C. Decomposition of both cellulose and hemicelluloses in the fibers takes place at 300 degrees C and above, while the degradation of fibers takes place above 400 degrees C. These data may help finding new uses for these fibers. (C) 2009 Elsevier B.V. All rights reserved

  • Characterization of banana, sugarcane bagasse and Sponge Gourd fibers of Brazil
    ELSEVIER SCIENCE BV, 2009
    Co-Authors: Guimaraes J. L., C G Da Silva, Frollini E., Wypych F., Satyanarayana K. G.
    Abstract:

    In recent times, increasing attention has been paid to the use of renewable resources particularly of plant origin keeping in view the ecological concerns, renewability and many governments passing laws for the use of such materials. On the other hand, despite abundant availability of lignocellulosic materials in Brazil, very few attempts have been made about their utilization, probably due to lack of sufficient structure/property data. Systematic studies to know their properties and morphology may bridge this gap while leading to value addition to these natural materials. Chemical composition, X-ray powder diffraction, and morphological studies and thermal behavior aspects in respect of banana, sugarcane bagasse Sponge Gourd fibers of Brazilian origin are presented. Chemical compositions of the three fibers are found to be different than those reported earlier. X-ray diffraction patterns of these three fibers exhibit mainly cellulose type I structure with the crystallinity indices of 39%, 48% and 50% respectively for these fibers. Morphological studies of the fibers revealed different sizes and arrangement of cells. Thermal stability of all the fibers is found to be around 200 degrees C. Decomposition of both cellulose and hemicelluloses in the fibers takes place at 300 degrees C and above, while the degradation of fibers takes place above 400 degrees C. These data may help finding new uses for these fibers. (C) 2009 Elsevier B.V. All rights reserved.National Council for Scientific and Technological Development (CNPq)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Funding Agencies-Coordination of Improvement of Higher Education Personnel (CAPES)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Funding for Studies and Projects (FINEP)Financiadora de Estudos e Projetos (FINEP