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    Wyświetlanie 1-7 z 7
    Tytuł:
    Dielectric properties of papaya seeds from 75 kHz to 5 MHz
    Autorzy:
    Berbert, P.A.
    Soares, K.J.
    Moura, E.E.
    Berbert-Molina, M.A.
    Oliveira, M.T.R.
    Martinazzo, A.P.
    Powiązania:
    https://bibliotekanauki.pl/articles/2082500.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    Carica papaya L.
    dielectric loss factor
    moisture content
    relative permittivity
    seed bulk density
    Opis:
    The object of this work was to study the dielectric properties of papaya seeds of the Golden cultivar and seeds of two papaya hybrids, Tainung and Calimosa, in the frequency range from 75 kHz to 5 MHz at four levels of bulk density, and with moisture contents ranging from 6 to 23% wet basis. The relative permittivity and the loss factor of the seeds were measured using a precision LCR meter, and their relationship with the variable frequency of the oscillating electric field, the seed moisture content and bulk density, and the cultivar/hybrid type were established. Relative permittivity for each value of the moisture content was reduced regularly as the frequency increased. Abrupt changes in the slopes of the curves demonstrating the relationship between the relative permittivity and the loss factor, and the moisture content were considered an indication of changes in the water sorption mechanisms occurring within the seed. The relationship between the relative permittivity and the loss factor, and bulk density was represented by linear functions with positive slopes. The effect of the cultivar or hybrid types on the relative permittivity and the loss factor revealed that seeds of the Golden cultivar and the Tainung hybrid exhibited similar relative permittivity values in the whole frequency range studied, in contrast to seeds of the Calimosa hybrid.
    Źródło:
    International Agrophysics; 2019, 33, 2; 185-192
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tubing decontamination during the leak test of iodine-125 seeds
    Autorzy:
    Moura, J. A.
    Moura, E. S.
    Sprenger, F. E.
    Nagatomi, H. R.
    Zeituni, C. A.
    Feher, A.
    Manzoli, J. E.
    Souza, C. D.
    Rostelato, M. E.
    Powiązania:
    https://bibliotekanauki.pl/articles/148765.pdf
    Data publikacji:
    2010
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    brachytherapy
    iodine seeds
    leak test
    sealed radioactive sources
    Opis:
    Leak tests were made to detect any leakage of radioactive material from inside the iodine-125 seeds applied in brachytherapy. These seeds are used in prostate cancer treatment. In the quality control routine, during seed production, leak tests are performed according to the International Standard Organization – radiation protection – sealed radioactive sources – ISO-9978 standard, and require liquid transfer between recipients. Any leakage causes contamination of the liquid and tubes. The aim of this study is the establishment of decontamination routines for tubes, allowing their repeated use, in the automated assay process.
    Źródło:
    Nukleonika; 2010, 55, 3; 409-413
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Development and production of radioactive sources used for cancer treatment in Brazil
    Autorzy:
    Rostelato, M. E. C. M.
    Rela, P. R.
    Zeituni, C. A.
    Feher, A.
    Manzoli, J. E.
    Moura, J. A.
    Moura, E. S.
    Silva, C. P. G.
    Powiązania:
    https://bibliotekanauki.pl/articles/148305.pdf
    Data publikacji:
    2008
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    radioactive sources production
    iodine-125 seeds
    iridium-192 wires
    brachytherapy
    cancer treatment
    Opis:
    The number of cancer patients in Brazil is increasing and part of the patients are submitted to brachytherapy treatment using iridium-192 wire and iodine-125 radioactive seeds. The Nuclear Energy Research Institute established a programme to produce iridium-192 wire and iodine-125 radioactive seeds. With the purpose of settling a laboratory for iridium-192 sources production, a wire activation method was developed and a hot cell for the wire manipulation, quality assurance and packaging was built. The iodine-125 seeds consist of a welded titanium capsule containing iodine-125 adsorbed onto a silver rod. Concerning the setup of the local production, the following activities were carried out: superficial treatment of the silver rod, development of a process to absorb the iodine in the silver rod, welding methodology to seal the seeds, leakage and contamination test and source activity measurement.
    Źródło:
    Nukleonika; 2008, 53, suppl. 2; 99-103
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mechanical and thermal properties of commercial multilayer flexible plastic packaging materials irradiated with electron beam
    Autorzy:
    Oliveira, V. M.
    Nogueira, B. R.
    Ortiz, A. V.
    Moura, E. A. B.
    Powiązania:
    https://bibliotekanauki.pl/articles/146772.pdf
    Data publikacji:
    2008
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    electron-beam radiation
    multilayer packaging materials
    mechanical properties
    thermal properties
    Opis:
    The effects of electron-beam irradiation on mechanical and thermal properties were studied for two commercial multilayer structures of flexible food packaging. Both the laminated poly(ethylene terephthalate) (PET)/ low-density polyethylene (LDPE) and the coextruded LDPE/polyamide(PA)/LDPE structures were irradiated up to 120 kGy using a 1.5 MeV electron beam accelerator, at room temperature in the presence of air. Mechanical properties showed significant changes (p < 0.05), specially in sealability that was severely affected. Changes in mechanical properties were discussed in relation to the eight day and the six month period after irradiation. In addition, the DSC analysis six months after treatment showed that the fusion enthalpy of the PET/LDPE structure components increase for the LDPE from 10 kGy and decrease for the PET up to 120 kGy (p < 0.05). On the other hand, the LDPE/PA6/ LDPE presented increase in the LDPE and PA up to 120 kGy, except for LDPE at 10 and 15 kGy and PA at 5 kGy doses (p < 0.05). The effects of irradiation were less severe for the LDPE/PA6/LDPE than for the PET/LDPE. The electron-beam irradiation did not show advantageous results that could be of interest for commercial applications for the film industry, but brings important information about the packaging behavior for food producers who may decide to use irradiation as a form of cold pasteurization of their packed products.
    Źródło:
    Nukleonika; 2008, 53, suppl. 2; 141-144
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Leakage test evaluation used for qualification of iodine-125 seeds sealing
    Autorzy:
    Feher, A.
    Rostelato, M. E. C. M.
    Zeituni, C. A.
    Calvo, W. A. P.
    Somessari, S. L.
    Moura, J. A.
    Moura, E. S.
    Souza, C. D.
    Rela, P. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/147662.pdf
    Data publikacji:
    2011
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    leakage test
    iodine-125 seeds
    prostate cancer
    brachytherapy
    titanium tube
    standard ISO-9978
    Opis:
    Brachytherapy is one of the possible treatments with ionizing radiation available for prostate cancer, in which small seeds containing iodine-125 radioisotope are implanted directly into the prostate. The seed consists of a sealed titanium tube containing a central silver wire with adsorbed iodine-125. The tube sealing is made with titanium at the ends, using plasma arc-welding (PAW) or laser process. This sealing must be leakage-resistant and free of cracks, therefore avoiding iodine-125 to deposit in the silver wire to escape and spread into the human body. To ensure that this problem is not occurring, rigorous leakage tests in accordance with the standard ISO-9978 should be applied. The aim of this study is to determine, implement and evaluate the leakage test to be used in the iodine-125 seeds production, in order to qualify the sealing procedure. The standard ISO-9978 presents a list of tests to be carried out according to the type of source. The preferential methods for brachytherapy sources are soaking and helium. To assess the seeds leakage, the method of immersion test at room temperature was applied. The seeds are considered leakage-free if the detected activity does not exceed 185 Bq (5 nCi). An iodine standard was prepared and its value determined in a sodium iodide detector. A liquid scintillation counter was calibrated with the standard for seed leakage tests. Forty-eight seeds were plasma arc-welded for these tests.
    Źródło:
    Nukleonika; 2011, 56, 4; 375-379
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A study about the measurement method of the homogeneity of radioactivity along an iridium-192 wire used in brachytherapy
    Autorzy:
    Costa, O. L.
    Calvo, W. A. P.
    Zeituni, C. A.
    Rostelato, M. E. C. M.
    Moura, J. A.
    Feher, A.
    Souza, C. D.
    Somessari, S. L.
    Powiązania:
    https://bibliotekanauki.pl/articles/148238.pdf
    Data publikacji:
    2014
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    iridium-192
    iridium wire
    low dose rate brachytherapy
    quality control
    cancer treatment
    radioactive sources production
    Opis:
    The Nuclear and Energy Research Institute has produced, since 1998, iridium-192 wires used in low dose rate brachytherapy. In the paper the authors studied the influence of wire profile on the homogeneity distribution of radioactivity of iridium-192 along the wire. The authors propose the improvements in the quality control procedure that will provide more accurate measurement data and suggest changes in control devices.
    Źródło:
    Nukleonika; 2014, 59, 1; 37-39
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of problems and solutions for urban freight transport in Brazilian cities
    Analiza problemów miejskiego transportu towarowego i rozwiązań stosowanych w brazylijskich miastach
    Autorzy:
    de Oliveira, Leise Kelli
    de Oliveira Leite Nascimento, Carla
    Tavares Muzzi Sousa, Luísa
    Costa e Silva, Thaiza Gabrielle
    Goes Pinto, Paulo Henrique
    Moura Pereira, Renata
    Pugas Farias, Lais
    Magalhães Oliveira, Renata Lúcia
    Ferreira, Suellem C.
    Rodrigues de Jesus, Mylena Cristine
    Alves Martins de Souza, Lara
    Powiązania:
    https://bibliotekanauki.pl/articles/1385671.pdf
    Data publikacji:
    2020-07-31
    Wydawca:
    Polskie Wydawnictwo Ekonomiczne
    Tematy:
    urban transport
    freight transport
    retailer
    transport miejski
    transport towarowy
    detalista
    Opis:
    This paper analyzes problems and solutions of urban freight transport in six cities of different sizes and economic profile in the State of Minas Gerais, Brazil. The data were collected in commercial establishments and analyzed through descriptive statistics and using the method of successive intervals. The results obtained reflect the retailers' point of view and indicate that the problems and solutions are different in each city considered in this paper. The availability of unloading zones is the main problem in Betim, Belo Horizonte, Contagem and Itabira. The off-peak delivery is viewed as a solution in Divinópolis, Betim and Itabira. Therefore, with no possibility to determine a single remedy as a broad national solution to urban freight transport, it is instead necessary to investigate the realities of each city so that the policymakers could implement local solutions that reduce the externalities of urban freight transport.
    W artykule przeanalizowano problemy miejskiego transportu towarowego i związane z tym rozwiązania stosowane w sześciu brazylijskich miastach różnej wielkości i o różnym profilu ekonomicznym, zlokalizowanych w stanie Minas Gerais. Dane do badań zbierano w placówkach handlowych i analizowano za pomocą statystyk opisowych oraz metodą kolejnych interwałów. Uzyskane wyniki odzwierciedlają punkt widzenia detalistów i wskazują, że problemy poszczególnych miast nie są jednakowe, podobnie jak potencjalne rozwiązania. Dostępność stref rozładunku jest głównym problemem w miastach Betim, Belo Horizonte, Contagem i Itabira. Natomiast dostawy poza godzinami szczytu są postrzegane jako rozwiązanie w Divinópolis, Betim i Itabira. Nie ma możliwości określenia jednego środka zaradczego jako szerokiego krajowego rozwiązania dla miejskiego transportu towarowego. Zamiast tego konieczne jest zbadanie realiów każdego miasta, aby decydenci mogli wdrożyć lokalne rozwiązania, które złagodzą efekty zewnętrzne miejskiego transportu towarowego.
    Źródło:
    Gospodarka Materiałowa i Logistyka; 2020, 7; 37-44
    1231-2037
    Pojawia się w:
    Gospodarka Materiałowa i Logistyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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