Navegação Livros - Capítulos por ano de publicação "2018"

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  • IPEN-DOC 25502

    BENTO, RODRIGO T. ; PILLIS, MARINA F. . Titanium dioxide films for photocatalytic degradation of methyl orange dye. In: YANG, DONGFANG (Ed.). Titanium Dioxide: material for a sustainable environment. London: IntechOpen, 2018. p. 211-225, cap. 11. DOI: 10.5772/intechopen.75528

    Abstract: The aim of this work was to characterize and evaluate the influence of the thickness on the photocatalytic efficiency of titanium dioxide thin films on the degradation of methyl orange dye under UV light irradiation. The films of 280 and 468 nm thick were deposited on borosilicate substrates at 400°C by the MOCVD technique using titanium isoproxide IV as precursor. XRD analyses showed the formation of anatase-TiO2 phase. Crosssectional FE-SEM images show that the films presented a dense columnar structure and grown perpendicularly to the substrate surface. The photocatalytic activity of the catalysts was studied using UV-vis spectrophotometry The TiO2 film with 468 nm of thickness presented higher photocatalytic activity exhibiting 69% of dye degradation. The increase of grain size and thickness of the films promoted an improvement of photocatalytic efficiency.

    Palavras-Chave: titanium oxides; films; chemical vapor deposition; photocatalysis

  • IPEN-DOC 24661

    OIDE, MARIANE Y.T.; SATANA, JULYANA ; WELLEN, RENATE; VALENZUELA-DIAZ, FRANCISCO; GUVEN, OLGUN; MOURA, ESPERIDIANA . The influence of clay reinforcement on the properties of recycled polymer foams. In: LI, BOWEN (Ed.); LI, JIAN (Ed.); IKHMAYIES, SHADIA (Ed.); ZHANG, MINGMING (Ed.); KALAY, YUNUS E. (Ed.); CARPENTER, JOHN S. (Ed.); HWANG, JIANN-YANG (Ed.); MONTEIRO, SERGIO N. (Ed.); FIRRAO, DONATO (Ed.); BROWN, ANDREW (Ed.); BAI, CHENGUANG (Ed.); PENG, ZHIWEI (Ed.); ESCOBEDO-DIAZ, JUAN P. (Ed.); GOSWAMI, RAMASIS (Ed.); KIM, JEONGGUK (Ed.). Characterization of Minerals, Metals, and Materials. TMS. Cham, CZ, Switzerland: Springer International Publishing AG, 2018. p. 703-712, (The Minerals, Metals & Materials Series). DOI: 10.1007/978-3-319-72484-3_75

    Abstract: Poly [(ethylene)-co-(vinyl acetate)] (EVA) is a thermoplastic copolymer composed of randomly distributed polyethylene and polyvinyl acetate sequences within the molecular chain. EVA combines toughness with excellent flexibility, impact and puncture resistance. Because of these properties, this material is largely used for foam production as padding in equipment for various sports and as a shock absorber in sport’s shoes. This work aims to study the influence of clay reinforcement on the performance of recycled polymer foams. The blend containing recycled HDPE (high density polyethylene) and recycled EVA (70/30 wt%, respectively) reinforced with 2 wt% of clays were prepared by melt extrusion, using a twin-screw extruder to obtain the composites. The composites and foaming agent were fed into a special single screw extruder for foaming. The samples of HDPE/EVA/Clay foams were characterized by tensile test, Field Emission Scanning Electron Microscopy (FE-SEM), Thermogravimetric Analysis (TG), Differential Scanning Calorimetry (DSC), X-ray Diffraction (XRD), density measurement and the correlation between the results was evaluated.

    Palavras-Chave: polyethylenes; polymerization; polyvinyls; clays; foams; nanocomposites

  • IPEN-DOC 24657

    ZAFALON, ANGELICA T. ; SANTOS, VINICIUS J. dos ; ESPOSITO, FERNANDA; LINCOPAN, NILTON; RANGARI, VIJAYA; LUGAO, ADEMAR B. ; PARRA, DUCLERC F. . Synthesis of polymeric hydrogel loaded with antibiotic drug for wound healing applications. In: LI, BOWEN (Ed.); LI, JIAN (Ed.); IKHMAYIES, SHADIA (Ed.); ZHANG, MINGMING (Ed.); KALAY, YUNUS E. (Ed.); CARPENTER, JOHN S. (Ed.); HWANG, JIANN-YANG (Ed.); MONTEIRO, SERGIO N. (Ed.); FIRRAO, DONATO (Ed.); BROWN, ANDREW (Ed.); BAI, CHENGUANG (Ed.); PENG, ZHIWEI (Ed.); ESCOBEDO-DIAZ, JUAN P. (Ed.); GOSWAMI, RAMASIS (Ed.); KIM, JEONGGUK (Ed.). Characterization of Minerals, Metals, and Materials. TMS. Cham, CZ, Switzerland: Springer International Publishing AG., 2018. p. 165-176, (The Minerals, Metals & Materials Series). DOI: 10.1007/978-3-319-72484-3_18

    Abstract: Polymeric hydrogels are natural or synthetic systems, which have gained interest due to their high biocompatibility with soft tissues. These types of hydrogels have been used for wound dressing as a drug delivery system. Here in this study the polymeric hydrogels based wound healing systems were prepared using poly (N-vinyl-2-pyrrolidone) (PVP), poly (ethylene glycol) (PEG), agar and neomycin drug followed by gamma irradiation to promote crosslinking and sterilization. The influence of irradiation process with 25 kGy dose was investigated. The gel fraction and maximum swelling were estimated using physicochemical methods and found about 95% gel fraction and 1100% swelling after 8 h of immersion. Neomycin released from hydrogel was carried out by Liquid Chromatography-Mass Spectrometry method and the drug concentration remained constant for 48 h. Hydrogel/neomycin exhibited antibacterial effects against Staphylococcus aureus. With these results, it can be inferred that hydrogel/neomycin is a suitable candidate for wound dressing.

    Palavras-Chave: hydrogels; polymers; antibiotics; drugs; wounds; neomycin; pvp; irradiation

  • IPEN-DOC 25883

    FUNGARO, DENISE A. ; IZIDORO, JULIANA C. ; GUILHEN, SABINE N. ; SILVA, KATIA C. ; WANG, SHAOBIN. Synthesis of nanocrystalline zeolite Na-A from coal fly ash and different aluminum sources: application for heavy metals removal. In: GRAY, MIRIAM (Ed.). Coal Fly Ash. Hauppauge, NY, USA: Nova Science Publishers, 2018. p. 1-33, cap. 4.

    Abstract: This chapter describes the synthesis process to obtain zeolite Na-A from coal fly ash via fusion with NaOH followed by hydrothermal reaction. Coal fly ash is a low cost source of both silica and alumina. The molar ratio of SiO2/Al2O3 for zeolite 4A formation was achieved by the addition of sodium aluminate solution or aluminum waste from tertiary industry as aluminum sources. The effects of temperature and time at the fusion step and the hydrothermal reaction time on crystalline products were investigated. The synthesized products were studied for their purity and yield as well as were characterized by different techniques such as Xray powder diffraction (XRD), scanning electron microscopy (SEM) and cation exchange capacity (CEC), among others. Analysis of the properties of the raw materials and the products demonstrates that the by-products can be used to produce a high purity zeolite A. The optimum conditions related to the synthesis was set and the samples were pure, highly crystalline and white. The synthesized zeolites were used for both the removal of Cd (II) and Zn (II) from aqueous solution. The results showed that coal fly ash and aluminum source can be transformed into zeolite A, which is considered as value-added material with adsorption properties.

    Palavras-Chave: synthesis; zeolites; nanocrystals; coal; fly ash

  • IPEN-DOC 25260

    CARVALHO FILHO, E.T.; MEDEIROS, J.T.N.; MARTINEZ, L.G. ; PINTO, V.C.. Study of error analysis and sources of uncertainty in the measurement of residual stresses by the X-Ray diffraction. In: SEEFELDT, MARC (Ed.). Residual Stresses. Millersville, PA, USA: Materials Research Forum LLC, 2018. p. 75-80, v. 6, (Materials Research Proceedings). DOI: 10.21741/9781945291890-13

    Abstract: The aim of this work is to analyze the sources of errors inherent to the residual stress measurement process by X-ray diffraction technique making an interlaboratory comparison to verify the reproducibility of the measurements. For this work were machined specimens with grinding finish, with polishing finish and to be a reference standard an iron powder was used To verify the deviations caused by the equipment, those specimens were positioned and with the same analysis condition, seven measurements were carried. To verify sample positioning errors, seven measurements were performed by positioning the sample at each measurement. To check geometry errors, measurements were repeated for the geometry Bragg Brentano and Parallel Beams. In order to verify the reproducibility of the method, the measurements were performed in two different laboratories and equipments. The results were statistically worked out and the quantification the type A errors that suggests that is a significant difference between the methods and orientation of grooves directions.

    Palavras-Chave: residual stresses; x-ray diffraction; measuring methods

  • IPEN-DOC 24660

    POVEDA, PATRICIA N.S. ; MOLARI, JULIANA A.; BRUNELLI, DEBORAH D.; SILVA, LEONARDO G.A. e . Study of different process additives applied to polypropylene. In: LI, BOWEN (Ed.); LI, JIAN (Ed.); IKHMAYIES, SHADIA (Ed.); ZHANG, MINGMING (Ed.); KALAY, YUNUS E. (Ed.); CARPENTER, JOHN S. (Ed.); HWANG, JIANN-YANG (Ed.); MONTEIRO, SERGIO N. (Ed.); FIRRAO, DONATO (Ed.); BROWN, ANDREW (Ed.); BAI, CHENGUANG (Ed.); PENG, ZHIWEI (Ed.); ESCOBEDO-DIAZ, JUAN P. (Ed.); GOSWAMI, RAMASIS (Ed.); KIM, JEONGGUK (Ed.). Characterization of Minerals, Metals, and Materials. TMS. Cham, CZ, Switzerland: Springer International Publishing AG, 2018. p. 661-667, (The Minerals, Metals & Materials Series). DOI: 10.1007/978-3-319-72484-3_70

    Abstract: There are several additives aimed on improving the processing characteristics as well as mechanical properties of the plastic materials. Being polypropylene is one of the main polymers used in the plastic processing industry due to its easy processability and application versatility, was chosen as the base resin for this study. Additives can aid the processing of polypropylene, either by promoting a better slip between the chains (lubricants), or by contributing to nucleation and crystallinity (nucleating). In this study, the raw materials copolymer polypropylene, lubricant (internal and external action), organic nucleating agent (metallic salt) and inorganic nucleating agent (metallic oxide) were considered. Mechanical tensile tests, Charpy impact and spiral flow to verify melt index were performed to characterize the samples with additives and standard (copolymer polypropylene). The interference of these additives with polymeric matrix was observed.

    Palavras-Chave: polypropylene; plastics; lubricants; additives; nucleation; crystallization

  • IPEN-DOC 25252

    FIORI, MARCIO A.; RIELLA, HUMBERTO G. ; KNOB, PAULO J.. Reatores nucleares de Geração III e de Geração IV. In: . Modal nuclear e a matriz energética global: contribuições e tendências do modal nuclear para a matriz energética global. Riga, Letônia: Novas Edições Acadêmicas, 2018. p. 61-74, cap. 4.

    Palavras-Chave: reactors; pwr type reactors; westinghouse standard reactor; risk analysis; nuclear fuels

  • IPEN-DOC 25250

    FIORI, MARCIO A.; RIELLA, HUMBERTO G. ; DURAZZO, MICHELANGELO . Reatores nucleares - breve introdução. In: . Modal nuclear e a matriz energética global: contribuições e tendências do modal nuclear para a matriz energética global. Riga, Letônia: Novas Edições Acadêmicas, 2018. p. 26-36, cap. 2.

    Palavras-Chave: reactors; nuclear power plants; fission; historical aspects

  • IPEN-DOC 25251

    FIORI, MARCIO A.; RIELLA, HUMBERTO G. ; KNOB, PAULO J.. Os reatores nucleares. In: . Modal nuclear e a matriz energética global: contribuições e tendências do modal nuclear para a matriz energética global. Riga, Letônia: Novas Edições Acadêmicas, 2018. p. 37-60, cap. 3.

    Palavras-Chave: reactors; nuclear power plants; fission; nuclear fuels; uranium; moderators; refrigeration

  • IPEN-DOC 24670

    MERGULHAO, MARCELLO V. ; PODESTA, CARLOS E. ; NEVES, MAURICIO D.M. das . Perspective of additive manufacturing selective laser melting in Co-Cr-Mo alloy in the consolidation of dental prosthesis. In: DOBRZAŃSKI, LESZEK A. (Ed.). Biomaterials in Regenerative Medicine. London, UK: IntechOpen, 2018. p. 161-185, cap. 6. DOI: 10.5772/intechopen.69720

    Abstract: This chapter seeks to compare the properties of samples manufactured by additive manufacturing (AM) by the selective laser melting (SLM) technology and compare with the precision casting (PC) processes using the Co-Cr-Mo (ASTM F75) alloy to manufacture of dental prosthesis. This AM process can be manufactured three-dimensional models by means of a laser beam that completely melts particles of powder deposited layer by layer. However, it is still relevant to know the properties of: performance, dimensional, mechanical and microstructural of this laser melting process and compare with a convencional process. The results of mechanical evaluation showed that the SLM technique provides superior mechanical properties compared to those obtained by the PC technique. It is possible to verify that the consolidation by SLM technique results in lower presence of porosity than PC technique. In addition, PC samples presented a gross dendritic microstructure of casting process. Microstructural analysis of SLM samples results in a characteristic morphology of layer manufacturing with ultrafine grains and a high chemical homogeneity. In this way, the development of the present study evidenced to improve the manufacture of customized components (copings) using the SLM technology.

    Palavras-Chave: dentistry; prostheses; teeth; additives; lasers; melting; cobalt alloys; chromium alloys; molybdenum alloys; medical supplies; casting

  • IPEN-DOC 25874

    SANTOS, SOFIA N. dos; BERNARDES, EMERSON S. ; SANTOS-OLIVEIRA, RALPH. Nanoradiopharmaceuticals in current molecular medicine. In: BARHOUM, AHMED (Ed.); MAKHLOUF, ABDEL S.H. (Ed.). Fundamentals of Nanoparticles. Amsterdam, Netherlands: Elsevier, 2018. p. 553-569, cap. 18. DOI: 10.1016/B978-0-323-51255-8.00018-5

    Palavras-Chave: radiopharmaceuticals; nanotechnology; molecules; nuclear medicine; nanoparticles; radioisotopes

  • IPEN-DOC 25254

    FIORI, MARCIO A.; RIELLA, HUMBERTO G. ; KNOB, PAULO J.. Modal nuclear e a matriz energética na América do Sul. In: . Modal nuclear e a matriz energética global: contribuições e tendências do modal nuclear para a matriz energética global. Riga, Letônia: Novas Edições Acadêmicas, 2018. p. 163-207, cap. 6.

    Palavras-Chave: reactors; reactor technology; nuclear power plants; nuclear energy; power supplies; electric power; south america

  • IPEN-DOC 24659

    MESQUITA, ANDERSON dos S. ; SILVA, LEONARDO G. de A. e ; MIRANDA, LEILA F. de. Mechanical, thermal and electrical properties of polymer (Ethylene Terephthalate—PET) filled with carbon black. In: LI, BOWEN (Ed.); LI, JIAN (Ed.); IKHMAYIES, SHADIA (Ed.); ZHANG, MINGMING (Ed.); KALAY, YUNUS E. (Ed.); CARPENTER, JOHN S. (Ed.); HWANG, JIANN-YANG (Ed.); MONTEIRO, SERGIO N. (Ed.); FIRRAO, DONATO (Ed.); BROWN, ANDREW (Ed.); BAI, CHENGUANG (Ed.); PENG, ZHIWEI (Ed.); ESCOBEDO-DIAZ, JUAN P. (Ed.); GOSWAMI, RAMASIS (Ed.); KIM, JEONGGUK (Ed.). Characterization of Minerals, Metals, and Materials. TMS. Cham, CZ, Switzerland: Springer International Publishing AG, 2018. p. 605-614, (The Minerals, Metals & Materials Series). DOI: 10.1007/978-3-319-72484-3_64

    Abstract: This work seeks to understand if PET compounds with carbon black can be uses to replace polypropylene and polystyrene for anti-static packaging materials. PET compounds were fabricated containing 10.0; 11.0; 12.0 and 15.0 weight % of carbon black with a particle size 325 mesh. We determined the thermomechanical properties (Dynamic Mechanical Analysis—DMA, Tensile Properties, Fracture Toughness, and Hardness) and Electrical properties of the compounds. In conclusion the results show the compound based on PET filled with 15.0% carbon black might be used in the handling, transportation and storage of electronic components because their mechanical properties, thermal and resistivity are satisfactory for this purpose.

    Palavras-Chave: polymers; ethylene; polyethylene terephthalate; carbon black; thermal conductivity

  • IPEN-DOC 25253

    FIORI, MARCIO A.; RIELLA, HUMBERTO G. ; KNOB, PAULO J.. A matriz energética dos principais países usuários do modal nuclear. In: . Modal nuclear e a matriz energética global: contribuições e tendências do modal nuclear para a matriz energética global. Riga, Letônia: Novas Edições Acadêmicas, 2018. p. 75-162, cap. 5.

    Palavras-Chave: reactors; reactor technology; nuclear power plants; nuclear energy; power supplies; electric power; france; china; usa; russian federation; japan; republic of korea

  • IPEN-DOC 25520

    COLEMAN, CHRISTOPHER E.; MARKELOV, VLADIMIR A.; ROTH, MARIA; MAKAREVICIUS, VIDAS; HE, ZHANG; CHAKRAVARTTY, JAYANTA K.; ALVAREZ-HOLSTON, ANNA-MARIA; ALI, LIAQAT; RAMANATHAN, LALGUDI ; INOZEMTSEV, VICTOR. Is spent nuclear fuel immune from delayed hydride cracking during dry storage? An IAEA coordinated research project. In: COMSTOCK, ROBERT J. (Ed.); MOTTA, ARTHUR T. (Ed.). Zirconium in the Nuclear Industry: 18th International Symposium. West Conshohocken, PA: ASTM International, 2018. p. 1224-1251, (Selected Technical Papers, STP1597). DOI: 10.1520/STP159720160048

    Abstract: Delayed hydride cracking (DHC) has been responsible for cracking in zirconium alloy pressure tubes and fuel cladding and is a concern for spent fuel storage. For cracking to start, sufficient hydrogen must be present for hydride to form at a flaw tip and the local tensile stress must be sufficiently large to crack the hydride (a crack will not extend if the threshold in the stress intensity factor, KIH, is not exceeded. A high-temperature limit exists when the yield stress of the cladding alloy becomes too low to crack the hydride. In this paper we describe measurements of KIH and the crack growth rate, V, in unirradiated Zircaloy-4 fuel cladding containing approximately 130 ppm hydrogen in the cold-worked stress–relieved condition representing pressurized water reactors (PWRs) and pressurized heavy-water (PHWR) reactors. Four methods are used to evaluate KIH. The test specimen and fixture used in these methods was the pin-loading tension configuration. The test temperature ranged from 227 to 315 C. The mean value of KIH below 280 C had little temperature dependence; it was about 5.5 MPaHm in the PWR cladding and slightly higher at 7 MPaHm in the PHWR material. At higher test temperatures, KIH increased dramatically to more than 12 MPaHm, whereas the crack growth rate declined toward zero. This behavior suggests that unirradiated Zircaloy-4 fuel cladding is immune from DHC above about 320 C; this temperature may be increased to 360 C by irradiation. The implications for spent fuel storage are that during early storage when the temperatures are high, any flaw will not extend by DHC, whereas at low temperatures, after many years of storage, flaws would have to be very large, approaching through wall, before being extended by DHC. To date, spent nuclear fuel is not known to have failed by DHC during storage, confirming the inference.

    Palavras-Chave: zircaloy 4; cladding; dry storage; temperature dependence; immunity; hydrides; cracking

  • IPEN-DOC 24658

    OLIANI, WASHINGTON L. ; PARRA, DUCLERC F. ; RANGARI, VIJAYA K.; LINCOPAN, NILTON; LUGAO, ADEMAR B. . Irradiation influence on the properties of HMS-Polypropylene Clay/AgNPs nanocomposites. In: LI, BOWEN (Ed.); LI, JIAN (Ed.); IKHMAYIES, SHADIA (Ed.); ZHANG, MINGMING (Ed.); KALAY, YUNUS E. (Ed.); CARPENTER, JOHN S. (Ed.); HWANG, JIANN-YANG (Ed.); MONTEIRO, SERGIO N. (Ed.); FIRRAO, DONATO (Ed.); BROWN, ANDREW (Ed.); BAI, CHENGUANG (Ed.); PENG, ZHIWEI (Ed.); ESCOBEDO-DIAZ, JUAN P. (Ed.); GOSWAMI, RAMASIS (Ed.); KIM, JEONGGUK (Ed.). Characterization of Minerals, Metals, and Materials. TMS. Cham, CZ, Switzerland: Springer International Publishing AG, 2018. p. 583-595, (The Minerals, Metals & Materials Series). DOI: 10.1007/978-3-319-72484-3_62

    Abstract: Due to its versatility and low cost, polypropylene (PP) is one of the most widely used polymers in the world, consequently in research and development of new products. The polypropylene modified was prepared by gamma irradiation in acetylene at 12.5 kGy dose, technical polymer also known as high-melt-strength-polypropylene (HMSPP). It was mixed with montmorillonite (MMT) clay and silver nanoparticles (AgNPs) for bactericide activity. HMS-Polypropylene-clay -silver nanocomposites were manufactured using twin-screw extruders. Those materials were prepared by a melt mixing process via twin screw extrusion with a wide range of processing conditions. The polypropylene nanocomposites (PPNC) surfaces were exposed to gamma-radiation (60Co) source in presence of nitrogen as inert atmosphere at 1; 3; 5; 10; 20 and 50 kGy doses for modified the surfaces in order to enhance biocide activity. The samples surfaces were characterized by Differential Scanning Calorimetry (DSC), X-ray Diffraction (XRD), Thermogravimetric Analysis (TGA), Scanning Electron Microscopy (SEM), Energy Dispersive Spectroscopy (EDX) and evaluated by determination of bactericide effects. The results indicate the formation of structures predominantly intercalated of HMSPP nanocomposite. Contact tests for antibacterial activity of the hybrid polymer were applied against Escherichia coli (Gram-negative) and Staphylococcus aureus (Gram-positive) bacteria. The irradiations on the samples surfaces were insufficient to promote activity on contact biocide tests.

    Palavras-Chave: nanocomposites; polypropylene; irradiation; gamma radiation; silver; clays; germicides; montmorillonite

  • IPEN-DOC 24664

    SANTANA, JULYANA ; SEIXAS, MARCUS V. de S. ; RANGARI, VIJAY; VALENZUELA-DIAZ, FRANCISCO; WIEBECK, HELIO; MOURA, ESPERIDIANA . Influence of electron-beam irradiation on the properties of LDPE/EDPM blend foams. In: LI, BOWEN (Ed.); LI, JIAN (Ed.); IKHMAYIES, SHADIA (Ed.); ZHANG, MINGMING (Ed.); KALAY, YUNUS E. (Ed.); CARPENTER, JOHN S. (Ed.); HWANG, JIANN-YANG (Ed.); MONTEIRO, SERGIO N. (Ed.); FIRRAO, DONATO (Ed.); BROWN, ANDREW (Ed.); BAI, CHENGUANG (Ed.); PENG, ZHIWEI (Ed.); ESCOBEDO-DIAZ, JUAN P. (Ed.); GOSWAMI, RAMASIS (Ed.); KIM, JEONGGUK (Ed.). Characterization of Minerals, Metals, and Materials. TMS. Cham, CZ, Switzerland: Springer International Publishing AG, 2018. p. 547-555, (The Minerals, Metals & Materials Series). DOI: 10.1007/978-3-319-72484-3_58

    Abstract: Closed-cell polyethylene (PE) foams have been extensively used in many applications such as packaging, transportation, sports, construction, and agriculture because of their variety of properties including light weight, chemical resistance, thermal and electrical insulation. The objective of this study is to evaluate the influence of electron-beam irradiation on the properties of LDPE/EPDM blend foams. The LDPE/EPDM blend (80/20 wt%) were prepared by melt extrusion, using a twin-screw extruder machine. The foam structure of LDPE/EPDM blends was obtained by melt extrusion process, using a special single screw for foaming with 1.5 wt% of foaming agent as blowing agent. The foam samples were irradiated by electron-beam at radiation dose of 25, 50, 75 and 100 kGy and submitted to heating in an oven at 100 °C. The specimen tests samples of irradiated and non-irradiated foams were submitted to mechanical tests, DSC, TG analysis and density measurement.

    Palavras-Chave: polyethylenes; ethylene propylene diene polymers; density; irradiation; tensile properties

  • IPEN-DOC 25879

    IZIDORO, JULIANA ; FUNGARO, DENISE ; CAMPELLO, FELIPE ; GUILHEN, SABINE . Immobilization agents study of toxic elements in coal ash. In: CASARES, J. (Ed.); PASSERINI, G. (Ed.); PERILLO, G. (Ed.). Environmental Impact IV. Southampton, UK: WIT Press, 2018. p. 387-395, v. 215, (WIT Transactions on Ecology and the Environment). DOI: 10.2495/EID180351

    Abstract: Metal leaching from coal fly ashes into the environment is of a much concern. A series of batch tests were performed to investigate the potential leaching of metals from fly ash modified with organosilane (OS) and quaternary ammonium surfactant (SF). The fly ash was collected at the Figueira Thermal Power Plant, located in the city of Figueira, State of Paraná. Firstly, the influence of ash mass/water volume ratio on the concentration of the elements in the leachates from untreated fly ash was evaluated. Subsequently, the capacities of immobilization of toxic elements by the different immobilizing agents were determined by measuring the pH and conductivity of the leachates from the treated fly ash. A significant reduction in the concentration of the elements was observed for all the leachate samples obtained from the ashes treated with OS. The concentrations were reduced by 89%, 77%, 42% and 11% for Cr, Mo, As and Se, respectively. When SF was used for the ash treatment, the concentration reduction in the leachates was found to be above 60% for all elements. These results show that both the OS and SF can be used as immobilizing agents for the retention of toxic elements presented in coal ashes.

    Palavras-Chave: coal; fly ash; metals; toxic materials; leaching; surfactants; silanes

  • IPEN-DOC 25887

    CORREA, F. ; SORDI, G. ; LEVY, D.S. . Evolução da filosofia do sistema de limitação de dose e a questão das substituições “superseded”. In: NEVES, LUIS (Coord.). Proteção contra radiações na comunidade dos países de língua portuguesa. Coimbra, Portugal: Imprensa da Universidade de Coimbra, 2018. p. 351-361, DOI: 10.14195/978-989-26-1602-5

    Abstract: O grande avanço da era nuclear mostrou que a filosofia do sistema de limitação de dose proposta pela Comissão Internacional de Proteção Radiológica em 1958 e os Limites Anuais Máximos Permissíveis (LAMP), careciam de mudanças, assim, com a atualização das recomendações surgiu uma nova filosofia, ainda vigente, denominada de Limites Anuais Máximos Admissíveis (LAMA) para que possamos estuda-los separadamente, analisando cuidadosamente como surgiram estas filosofias e como foram evoluindo até as suas últimas publicações. 352 Uma vez que cada nova publicação substituía a anterior, e a ICRP e o Organismo Internacional de Energia atômica (IAEA) firmaram o acordo pelo qual este último adotaria a filosofia proposta pela Comissão, houve a possibilidade que algumas destas informações, algumas valiosas, possam ter se perdido no decorrer da substituição da publicação e ou da edição da norma do IAEA na adoção da filosofia. Estas informações são discutidas e estudadas em profundidade e o seu valor real mostrado, levantando a possibilidade de reintroduzi-las nas futuras publicações.

    Palavras-Chave: annual limit of intake; data compilation; equivalent radiation doses; information systems; international convention on nuclear safety; nuclear data collections; personnel dosimetry; radiation protection; recommendations

  • IPEN-DOC 25248

    PIERETTI, EURICO F. ; RODAS, ANDREA C.D.; ANTUNES, RENATO A.; NEVES, MAURICIO D.M. . Evaluation of the biotribological behavior and cytotoxicity of laser-textured ISO 5832-1 stainless steel for use in orthopedic implants. In: JOHNSON, DAVID (Ed.). Tribology, Lubricants and Additives. London: IntechOpen, 2018. p. 65-76, cap. 4. DOI: 10.5772/intechopen.73140

    Abstract: This chapter evaluated the influence of laser texturing process on the tribological behavior of the ISO 5832-1 austenitic stainless steel (SS). The friction coefficient and wear were determined using ball-cratering wear tests. The laser texturing process was carried out with a nanosecond optical fiber ytterbium laser at four different pulse frequencies. Cytotoxicity tests were carried out to determine if laser texturing affects the biomaterial biocompatibility. For comparison reasons, pristine surfaces were also evaluated. The results indicated that the wear volume and friction coefficient were reduced after laser texturing. The samples were considered noncytotoxic according to the biocompatibility tests as the laser texturing process did not decrease cell’s viability.

    Palavras-Chave: antimitotic drugs; toxicity; stainless steels; tribology; lasers; texture; implants

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A pesquisa apresentará melhor resultado selecionando um dos filtros disponíveis em Navegar

Os filtros disponíveis em Navegar tais como: Coleções, Ano de publicação, Títulos, Assuntos, Autores, Revista, Tipo de publicação são autoexplicativos. O filtro, Autores IPEN apresenta uma relação com os autores vinculados ao IPEN; o ID Autor IPEN diz respeito ao número único de identificação de cada autor constante no RD e sob o qual estão agrupados todos os seus trabalhos independente das variáveis do seu nome; Tipo de acesso diz respeito à acessibilidade do documento, isto é , sujeito as leis de direitos autorais, ID RT apresenta a relação dos relatórios técnicos, restritos para consulta das comunidades indicadas.

A opção Busca avançada utiliza os conectores da lógica boleana, é o melhor recurso para combinar chaves de busca e obter documentos relevantes à sua pesquisa, utilize os filtros apresentados na caixa de seleção para refinar o resultado de busca. Pode-se adicionar vários filtros a uma mesma busca.

Exemplo:

Buscar os artigos apresentados em um evento internacional de 2015, sobre loss of coolant, do autor Maprelian.

Autor: Maprelian

Título: loss of coolant

Tipo de publicação: Texto completo de evento

Ano de publicação: 2015

Para indexação dos documentos é utilizado o Thesaurus do INIS, especializado na área nuclear e utilizado em todos os países membros da International Atomic Energy Agency – IAEA , por esse motivo, utilize os termos de busca de assunto em inglês; isto não exclui a busca livre por palavras, apenas o resultado pode não ser tão relevante ou pertinente.

95% do RD apresenta o texto completo do documento com livre acesso, para aqueles que apresentam o significa que e o documento está sujeito as leis de direitos autorais, solicita-se nesses casos contatar a Biblioteca do IPEN, bibl@ipen.br .

Ao efetuar a busca por um autor o RD apresentará uma relação de todos os trabalhos depositados no RD. No lado direito da tela são apresentados os coautores com o número de trabalhos produzidos em conjunto bem como os assuntos abordados e os respectivos anos de publicação agrupados.

O RD disponibiliza um quadro estatístico de produtividade, onde é possível visualizar o número dos trabalhos agrupados por tipo de coleção, a medida que estão sendo depositados no RD.

Na página inicial nas referências são sinalizados todos os autores IPEN, ao clicar nesse símbolo será aberta uma nova página correspondente à aquele autor – trata-se da página do pesquisador.

Na página do pesquisador, é possível verificar, as variações do nome, a relação de todos os trabalhos com texto completo bem como um quadro resumo numérico; há links para o Currículo Lattes e o Google Acadêmico ( quando esse for informado).

ATENÇÃO!

ESTE TEXTO "AJUDA" ESTÁ SUJEITO A ATUALIZAÇÕES CONSTANTES, A MEDIDA QUE NOVAS FUNCIONALIDADES E RECURSOS DE BUSCA FOREM SENDO DESENVOLVIDOS PELAS EQUIPES DA BIBLIOTECA E DA INFORMÁTICA.

O gerenciamento do Repositório está a cargo da Biblioteca do IPEN. Constam neste RI, até o presente momento 20.950 itens que tanto podem ser artigos de periódicos ou de eventos nacionais e internacionais, dissertações e teses, livros, capítulo de livros e relatórios técnicos. Para participar do RI-IPEN é necessário que pelo menos um dos autores tenha vínculo acadêmico ou funcional com o Instituto. Nesta primeira etapa de funcionamento do RI, a coleta das publicações é realizada periodicamente pela equipe da Biblioteca do IPEN, extraindo os dados das bases internacionais tais como a Web of Science, Scopus, INIS, SciElo além de verificar o Currículo Lattes. O RI-IPEN apresenta também um aspecto inovador no seu funcionamento. Por meio de metadados específicos ele está vinculado ao sistema de gerenciamento das atividades do Plano Diretor anual do IPEN (SIGEPI). Com o objetivo de fornecer dados numéricos para a elaboração dos indicadores da Produção Cientifica Institucional, disponibiliza uma tabela estatística registrando em tempo real a inserção de novos itens. Foi criado um metadado que contém um número único para cada integrante da comunidade científica do IPEN. Esse metadado se transformou em um filtro que ao ser acionado apresenta todos os trabalhos de um determinado autor independente das variáveis na forma de citação do seu nome.

A elaboração do projeto do RI do IPEN foi iniciado em novembro de 2013, colocado em operação interna em julho de 2014 e disponibilizado na Internet em junho de 2015. Utiliza o software livre Dspace, desenvolvido pelo Massachusetts Institute of Technology (MIT). Para descrição dos metadados adota o padrão Dublin Core. É compatível com o Protocolo de Arquivos Abertos (OAI) permitindo interoperabilidade com repositórios de âmbito nacional e internacional.

1. Portaria IPEN-CNEN/SP nº 387, que estabeleceu os princípios que nortearam a criação do RDI, clique aqui.


2. A experiência do Instituto de Pesquisas Energéticas e Nucleares (IPEN-CNEN/SP) na criação de um Repositório Digital Institucional – RDI, clique aqui.

O Repositório Digital do IPEN é um equipamento institucional de acesso aberto, criado com o objetivo de reunir, preservar, disponibilizar e conferir maior visibilidade à Produção Científica publicada pelo Instituto, desde sua criação em 1956.

Operando, inicialmente como uma base de dados referencial o Repositório foi disponibilizado na atual plataforma, em junho de 2015. No Repositório está disponível o acesso ao conteúdo digital de artigos de periódicos, eventos, nacionais e internacionais, livros, capítulos, dissertações, teses e relatórios técnicos.

A elaboração do projeto do RI do IPEN foi iniciado em novembro de 2013, colocado em operação interna em julho de 2014 e disponibilizado na Internet em junho de 2015. Utiliza o software livre Dspace, desenvolvido pelo Massachusetts Institute of Technology (MIT). Para descrição dos metadados adota o padrão Dublin Core. É compatível com o Protocolo de Arquivos Abertos (OAI) permitindo interoperabilidade com repositórios de âmbito nacional e internacional.

O gerenciamento do Repositório está a cargo da Biblioteca do IPEN. Constam neste RI, até o presente momento 20.950 itens que tanto podem ser artigos de periódicos ou de eventos nacionais e internacionais, dissertações e teses, livros, capítulo de livros e relatórios técnicos. Para participar do RI-IPEN é necessário que pelo menos um dos autores tenha vínculo acadêmico ou funcional com o Instituto. Nesta primeira etapa de funcionamento do RI, a coleta das publicações é realizada periodicamente pela equipe da Biblioteca do IPEN, extraindo os dados das bases internacionais tais como a Web of Science, Scopus, INIS, SciElo além de verificar o Currículo Lattes. O RI-IPEN apresenta também um aspecto inovador no seu funcionamento. Por meio de metadados específicos ele está vinculado ao sistema de gerenciamento das atividades do Plano Diretor anual do IPEN (SIGEPI). Com o objetivo de fornecer dados numéricos para a elaboração dos indicadores da Produção Cientifica Institucional, disponibiliza uma tabela estatística registrando em tempo real a inserção de novos itens. Foi criado um metadado que contém um número único para cada integrante da comunidade científica do IPEN. Esse metadado se transformou em um filtro que ao ser acionado apresenta todos os trabalhos de um determinado autor independente das variáveis na forma de citação do seu nome.