Literatura científica selecionada sobre o tema "Pr6111"
Crie uma referência precisa em APA, MLA, Chicago, Harvard, e outros estilos
Consulte a lista de atuais artigos, livros, teses, anais de congressos e outras fontes científicas relevantes para o tema "Pr6111".
Ao lado de cada fonte na lista de referências, há um botão "Adicionar à bibliografia". Clique e geraremos automaticamente a citação bibliográfica do trabalho escolhido no estilo de citação de que você precisa: APA, MLA, Harvard, Chicago, Vancouver, etc.
Você também pode baixar o texto completo da publicação científica em formato .pdf e ler o resumo do trabalho online se estiver presente nos metadados.
Artigos de revistas sobre o assunto "Pr6111"
1
Fu, Xiu Li, Hai Feng e Zhi Jian Peng. "Effect of Pr6O11 Doping on the Microstructural and Electrical Properties of ZnO-Pr6O11-Co3O4-Cr2O3-SnO2 Varistors". Key Engineering Materials 633 (novembro de 2014): 308–12. http://dx.doi.org/10.4028/www.scientific.net/kem.633.308.
Texto completo da fonteResumo:
ZnO-Pr6O11-Co3O4-Cr2O3-SnO2 varistors with different doping levels of Pr6O11 (0.25-2 mol%) were prepared at 1300 °C with conventional ceramic processing, and the effect of Pr6O11 doping on the microstructure and electrical properties of the varistor materials were investigated. The results indicated that the doped Pr6O11 basically existed at the boundary of ZnO grains in the varistor ceramics, and SnO2 might enter into the lattice of ZnO grains or precipitate in reaction with Pr6O11 into Pr2Sn2O7 at the gain boundaries particularly where there were three or more ZnO grains. The analysis of scanning electron microscopy further revealed that Pr6O11 doping would inhibit the growth of ZnO grains, resulting in decreasing ZnO grain size with increasing doping level of Pr6O11. The measured electric-field/current-density characteristics of the samples showed that the varistor voltage increased with increasing doping level of Pr6O11 when the doping level was no more than 1.5 mol%, and the nonlinear coefficient of the varistors increased with increasing doping level of Pr6O11 up to no more than 1.0 mol% in the varistors, respectively.
2
Feng, Hai, Zhi Jian Peng, Cheng Biao Wang, Zhi Qiang Fu e He Zhuo Miao. "ZnO-Pr6O11-Co3O4-TiO2-Based Ceramic Varistor Materials". Key Engineering Materials 434-435 (março de 2010): 389–92. http://dx.doi.org/10.4028/www.scientific.net/kem.434-435.389.
Texto completo da fonteResumo:
The preparation and characterization of ZnO-Pr6O11-Co3O4-TiO2 (ZPCT) based varistor materials with different doping levels of TiO2 and Pr6O11 were investigated. The results reveal that: (1) TiO2 is an important additive, acting as an inhibitor of ZnO grain growth. The doping of appropriate amount of TiO2 can significantly improve the nonlinear properties and decreases the leakage current of the varistors, achieving a relatively high nonlinear exponent and low leakage current with 1.0 mol% TiO2 doped. (2) The oxide of Pr6O11 microstructurally plays the role of inhibition in grain growth. The doping of appropriate amount of Pr6O11 can improve the nonlinear property, and decrease the leakage currents of the varistors, acquiring the optimum results with 1.5 mol% Pr6O11 doped.
3
Wang, Wanhua, Haixia Li, Ka-Young Park, Taehee Lee e Fanglin (Frank) Chen. "Improving the Performance for Direct Electrolysis of CO2 in Solid Oxide Electrolysis Cell with Sr1.9Fe1.5Mo0.5 O6 - δ Electrode Via Infiltration of Pr6O11 Nanoparticles". ECS Meeting Abstracts MA2022-02, n.º 47 (9 de outubro de 2022): 1778. http://dx.doi.org/10.1149/ma2022-02471778mtgabs.
Texto completo da fonteResumo:
High temperature direct CO2 electrolysis based on solid oxide electrolysis cell (CO2-SOEC) is a promising technology to convert carbon dioxide to carbon monoxide with a high current density and Faradaic efficiency. The exploration for suitable cathodes with desirable catalytic activity is a grand challenge for the development of CO2-SOEC. Sr2Fe1.5Mo0.5O6 - δ is often used as the cathode material for SOEC, but suffers from insufficient activity for CO2 reduction reaction (CO2RR). In this work, nanoscale Pr6O11 was infiltrated into the Sr1.9Fe1.5Mo0.5O6 - δ (SFM) electrode to promote the CO2RR performance in SOEC. The optimal loading of Pr6O11 is systematically investigated. At 800°C, the current density of the Pr6O11 infiltrated SFM cathode with a Pr6O11 loading of 13.4wt.% reaches 1.58 A/cm2 at 1.5V, which is 2.5 times higher than that of SFM cathode (0.63 A/cm2) at the same operating conditions. X-ray photoelectron spectroscopy characterization and temperature-programmed desorption of CO2 measurements indicate that the adsorption and desorption ability of CO2 of SFM cathode are improved by the infiltration of Pr6O11. Further, the polarization resistance of SFM cathode has significantly decreased with the infiltrated Pr6O11. These results demonstrate that the infiltration of Pr6O11 is a promising approach for increasing CO2RR activity. Acknowledgements Financial support from the U.S. Department of Energy (DE-EE0009427) and NASA EPSCoR (Grant # 80NSSC20M0233) is greatly appreciated.
4
Zhu, Jian Feng, Ji Qiang Gao, Fen Wang e Ping Chen. "Influence of Pr6O11 on the Characteristics and Microstructure of Zinc Varistors". Key Engineering Materials 368-372 (fevereiro de 2008): 500–502. http://dx.doi.org/10.4028/www.scientific.net/kem.368-372.500.
Texto completo da fonteResumo:
The influence of the amount of Pr6O11 additions on the microstructure and electrical properties of varistors ceramics in the ZnO-Bi2O3 system was investigated. Samples with a low level of Pr6O11 (0.1wt %) have high microstructural homogeneity, which enhances the nonlinear coefficient greatly, and decreases the leakage current without change of voltage ratio. When the Pr6O11 content reached 7wt%, the ZnO grain growth was restricted and the threshold voltage was improved from 275v/mm to 440v/mm. The additive of Pr6O11 changed the process of creating spinel phase, which came from the decomposition of pyrochlore phase. This type of small size phase has more dragging force on the ZnO crystal, which make the whole materials more uniform and compact.
5
Peng, Zhi Jian, Feng Jiang, Hai Feng e Xiu Li Fu. "Doping Effect of Alkali Ions on the Microstructural and Electrical Properties of ZnO-Pr6O11-Based Varistor Ceramics". Key Engineering Materials 544 (março de 2013): 213–18. http://dx.doi.org/10.4028/www.scientific.net/kem.544.213.
Texto completo da fonteResumo:
The microstructural and electrical properties of ZnO-Pr6O11-based ceramics fabricated with 97.5mol% ZnO + 0.5mol% Pr6O11 + 1.0mol% Co3O4 + 0.5mol% Cr2O3 + 0.5mol% MNO3 (M=Li, Na, K, or Rb) were investigated. Scanning electron microscopy analysis revealed that the doping of alkali ions would inhibit the growth of ZnO grains in the as-prepared ZnO-Pr6O11-based ceramics, in which the addition of K+ ion showed the strongest effect. Through the analysis of electric field vs current density characteristics, it was found that the doping of Li+ ion into ZnO-Pr6O11-based ceramics would change the varistor into ohmic resistor, but the addition of Na+, K+ or Rb+ ion could improve the nonlinearity of the varistors, in which the addition of K+ ion resulted in the strongest improving effect.
6
Bakhtiyarly, Ikhtiyarly B., Gulnar M. Fatullayeva e Orudg Sh Kerimli. "GLASS FORMATION IN TERNARY SYSTEM La2O3–As2S3–Pr6O11". IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENIY KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA 61, n.º 4-5 (17 de abril de 2018): 43. http://dx.doi.org/10.6060/tcct.20186104-05.5637.
Texto completo da fonteResumo:
Boundaries of glass formation in ternary system La2O3-As2S3-Pr6O11 were studied using methods of physical-chemical analysis (DTA, DTG, X-ray analysis, MSA). It was established that in glass formation region the range of concentration covers from As2S3-La2O3 15 mol%, but from As2S3-Pr6O11 it is 13 mol%. To our opinion the decrease in glass formation region of Pr6O11 comparing to La2O3 is related to crystalline structure of oxide, i.e. to the change in coordination number of lanthanides. Because properties of compounds of lanthanide are more sensitive to the change in coordination numbers relative to radii of ion. In the system the region of transparent glass formation is limited with the region of non-transparent one. The reason of non-transparency of a glass is the formation of primary centers of crystallization, which was confirmed by the results of X-ray analysis and SEM. Raman spectra of transparent glass containing(La2O3)0.07(As2S3)0.90(Pr6O11)0.03 were studied. Intensity of bands which characterize the bonds of As–S, La–O, Pr–O in Raman spectrum and shift of energy of waves in the big party are related to the strengthening of bonds and probably, appearance of new bonds in glasses. When heating glasses of the composition (La2O3)0.07(As2S3)0.90(Pr6O11)0.03 in inert atmosphere (He) at 224,61 °С it softens which is followed by endoeffects. Observed exoeffect at 315,80 °С satisfies crystallization of glass, but at 380,80 °С thermal decomposition begins. Samples in the region of glass formation are stable at 300 K to air, water and organic solvents. When heated, glasses are dissolved in chromic mixture. They decompose in mineral acids and alkalies.Forcitation:Bakhtiyarly I.B., Fatullayeva G.M., Kerimli O.Sh. Glass formation in ternary system La2O3–As2S3–Pr6O11. Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2018. V. 61. N 4-5. P. 43-48
7
Li, H. "Abstract PR611". Anesthesia & Analgesia 123 (setembro de 2016): 777–78. http://dx.doi.org/10.1213/01.ane.0000492990.38417.15.
Texto completo da fonte
8
Djellal, Nacira, Djamel eddine Mekki, Elena Navarro e Pilar Marin. "Influence of Pr6O11 addition on structural and magnetic properties of mechanically alloyed Fe65Co35 nanoparticles". Frattura ed Integrità Strutturale 16, n.º 60 (25 de março de 2022): 393–406. http://dx.doi.org/10.3221/igf-esis.60.27.
Texto completo da fonteResumo:
This work focuses on the synthesize of nanostructured (Fe65Co35)100-x (Pr6O11)x (x = 0, 5) powders using high energy ball milling. The influence of Pr6O11 on structural, morphological and magnetic properties of Fe65Co35 nanoparticles were carried out by X-ray diffraction (XRD), scanning electron microscopy (SEM) with a dispersive energy analyzer (EDS), vibratory sample magnetometer (VSM) and differential scanning calorimetry (DSC). Results show that the praseodymium oxide addition increased the decrement rate of the crystallite size with milling time of about 27 % and decreased the increment rate of the internal micro-strain of 50 %. Moreover, because of its high grain fragmentation tendency, Pr6O11 increases the hardness and brittleness of Fe-Co powders. Moreover, it minimized the cold welding between Fe-Co ductile particles leading to a significant decrease in the average particle size (~1µm). The magnetic measurements conducted at room temperature show that the saturation magnetisation (Ms) and the coercivity (Hc) increased with milling time in both compositions. A low Ms and high Hc values were detected in (Fe65Co35)95 (Pr6O11)5 nanoparticles. The results demonstrated a soft ferromagnetic nature in all of the synthesized nanoparticles with Ms in the range 207 – 216 emu/g and Hc is found to be 113 Oe.
9
Hung, Nguyen The, Nguyen Dinh Quang e Slavko Bernik. "Electrical and microstructural characteristics of ZnO–Bi2O3-based varistors doped with rare-earth oxides". Journal of Materials Research 16, n.º 10 (outubro de 2001): 2817–23. http://dx.doi.org/10.1557/jmr.2001.0388.
Texto completo da fonteResumo:
ZnO-based varistor samples with a relatively high Sb2O3 to Bi2O3 ratio of 5 were fired at 1200 °C and found to have a high threshold voltage (VT) of 280 V/mm and a low energy-absorption capacity of 50 J/cm3. The introduction of rare-earth oxides (REO) increased the energy-absorption capacity of Pr6O11- and Nd2O3-doped samples to 110 J/cm3 while their threshold voltage (VT) remained slightly above 300 V/mm. Doping with Pr6O11 and Nd2O3 altered the formation of the spinel phase and significantly changed its particle size and distribution which, as a result, had a positive effect on the energy-absorption capacity of the REO-doped samples. Doping with small amounts of Pr6O11 and Nd2O3 appears to be promising for the preparation of ZnO-based varistors with a high breakdown voltage and a high energy absorption capacity.
10
Feng, Hai, Zhi Jian Peng, Zhi Qiang Fu, Wen Yue, Xiang Yu, Cheng Biao Wang, Long Hao Qi e He Zhuo Miao. "Optimization of Sintering Temperature and Doping Level of Cr2O3 in ZnO-Pr6O11-Based Varistor Ceramics". Advanced Materials Research 177 (dezembro de 2010): 382–85. http://dx.doi.org/10.4028/www.scientific.net/amr.177.382.
Texto completo da fonteResumo:
The electrical properties of ZnO-Pr6O11-based varistors, which composed of (98.5-x)mol% ZnO +0.5mol% Pr6O11 +1.0mol% Co3O4 +xmol% Cr2O3 (x=0.0, 0.25, 0.5, 1.0, 2.0), were investigated as a function of sintering temperature in the range of 1250-1400°C for 2 h. At the same sintering temperature, the nonlinear exponents increased with the increase of Cr2O3 doping amount no more than 0.5mol%, but decreased with more Cr2O3 doped. With the same doping level of Cr2O3, the samples' varistor voltage decreased with the sintering temperature increased; and the samples' nonlinear exponents increased first with the sintering temperature increased to 1300 °C, but decreased when the temperature increased further. Conclusively, the electrical properties of ZnO-Pr6O11-Co3O4- Cr2O3 varistors were strongly affected by the sintering temperature and the doping level of Cr2O3, and the samples, doped with 0.5 mol% Cr2O3 and sintered at 1300 °C, exhibited the optimum nonlinear performance.
Teses / dissertações sobre o assunto "Pr6111"
1
King, Richard Jay. "Immediate passage : the narrative of Joel H. Brown, with a critical essay on form and style in the sea voyage narrative". Thesis, St Andrews, 2008. http://hdl.handle.net/10023/550.
Texto completo da fonte
2
Irion, Herve Stangler. "Cerâmica varistora à base de SnO2 dopada com Pr6O11". UNIVERSIDADE ESTADUAL DE PONTA GROSSA, 2006. http://tede2.uepg.br/jspui/handle/prefix/1391.
Texto completo da fonteResumo:
Made available in DSpace on 2017-07-21T20:42:31Z (GMT). No. of bitstreams: 1
Herve Stangler Irion.pdf: 4493069 bytes, checksum: 2fe9398c9c2006313a4b148ad265c9dd (MD5)
Previous issue date: 2006-03-30In this work it was investigated the influence the in influence of the doping Pr6O11 in the electrical conductivity and in the microstructural properties in the basic ternary system (98,95 – x)%Sn02 1,0% Co0 0,05%Ta205. The used concentration of the doping Pr6011 had varied in 0,05%, 0.5% in mol, remaining constant the concentrations for the Co0 and Ta205. The processing applied was the conventional method of mixture of oxides in ambient atmosphere. The samples had been conformed in 50 MPa and sintered in 1350°C for 2 hours. After the sintering the densification of ceramics was verified with a value of 93,63% for the system with 0,1% in mol of Pr6011. The study of the electrical properties for the varistor system Sn02.Co0.Ta205 Pr6011 was carried out in continuous current in the ambient temperature and in function of the temperature. It was observed that the variation in the concentration of Pr6011 modifies the electrical behavior of the ceramics. The electrical parameters found are of [alfa]= 8,0, Er= 319 volts/cm and Vb= 0,66 volts/barrier for basic ternary system and [alfa]= 17,0 Er= 853 volts/cm and Vb= 1,15 volts/barrier with the addition of 0,10% in mol of Pr6011. The system with 0,05% mol 0.1% in mol Pr6011 presents the same value of the non linearity coefficient of the system with 0,1% in mol, however, with lower values of rupture tension and barrier tension (Er= 708 volts/cm and Vb= 0,98 volts/barrier). To concentration above of 0,1% in mol of Pr6011, the increase of the concentration of this doping, starts to be deleterious to the varistor characteristics. This effects is due to the increase in the concentration of the stannate of praseodymium phase (Pr2Sn207). This crystalline phase with the cassiterita phase (Sn02)was characterized by DRX and EDS and quantified by the refinement of Rietveld.
Neste trabalho investigou-se a influência do dopante Pr6O11 na condutividade elétrica e nas propriedades microestruturais no sistema ternário básico (98,95-x)%SnO2.1,0%CoO.0,05%Ta2O5. As concentrações utilizadas do dopante Pr6O11 variaram em 0,05%, 0,1%, 0,3% e 0,5% em mol, mantendo-se constante as concentrações para o CoO e Ta2O5 . O processamento empregado foi o método convencional de mistura dos óxidos. As amostras foram conformadas a 50 MPa e, sinterizadas a 1350ºC por 2 horas em atmosfera ambiente. Após a sinterização verificou-se densificação das cerâmicas, com valor de 93,63% para o sistema com 0,1% em mol de Pr6O11. O estudo das propriedades elétricas para o sistema varistor SnO2.CoO.Ta2O5 Pr6O11 foi realizado em corrente contínua a temperatura ambiente e, em função da temperatura. Observou-se que a variação na concentração de Pr6O11 altera o comportamento elétrico das cerâmicas. Os parâmetros elétricos encontrados são de [alfa] = 8,0, Er= 319 volts/cm e Vb= 0,66 volts/barreira para o sistema ternário básico e, [alfa] = 17,0, Er= 853 volts/cm e Vb = 1,15 volts/barreira com a adição de 0,10% em mol de Pr6O11. O sistema com 0,05% em mol de Pr6O11 apresenta o mesmo valor do coeficiente de não linearidade do sistema com 0,1 % em mol, entretanto, com valores menores de tensão de ruptura e tensão de barreira (Er= 708 volts/cm e Vb= 0,98 volts/barreira). Para concentrações acima de 0,1% em mol de Pr6O11, o aumento da concentração desse dopante, passa a ser deletério para as características varistoras. Esse efeito é devido ao aumento na concentração da fase cristalina estanato de praseodímio (Pr2Sn2O7). Essa fase cristalina, juntamente com a fase cassiterita (SnO2), foi caracterizada por DRX e por EDS e, quantificadas pelo refinamento de Rietveld.
3
Zinatloo-Ajabshir, S., e M. Salavati-Niasari. "Facile Solvent-Less Preparation, Characterization and Investigation of Photocatalytic Properties of Pr6O11 Nanostructures". Thesis, Sumy State University, 2015. http://essuir.sumdu.edu.ua/handle/123456789/42498.
Texto completo da fonteResumo:
Pr6O11 nanostructures were synthesized through a facile solvent-less method. Nanostructures were prepared by heat treatment in air, using [Pr L(NO3)2]NO3 (L bis-(salicyladehyde)-1,4-butadiimine Schiff base ligand), as new precursor, which was obtained by a solvent-free solid–solid reaction from praseodymium nitrate and Schiff base ligand. The as-obtained nanostructures were characterized by X-ray diffraction
(XRD), scanning electron microscopy (SEM) and ultraviolet–visible (UV–vis)spectroscopy. The obtained results demonstrated that utilizing of this precursor is suitable choice for preparation of Pr6O11 nanostructures with very uniform sphere-like morphology. The photocatalyst activity of as-obtained Pr6O11 was also examined by degradation of 2-naphthol as organic contaminant under ultraviolet light irradiation.
4
Olegario, Renata Cristina. "ESTUDO DOS SISTEMAS CeO2(1-x) :Pr6O11(x); CeO2(1-x):Fe2O3(x) E CeO2(0,95-x): Pr6O11(0,05):Fe2O3(x) PARA APLICAÇÃO COMO PIGMENTOS INORGÂNICOS DE BAIXA TOXICIDADE". UNIVERSIDADE ESTADUAL DE PONTA GROSSA, 2012. http://tede2.uepg.br/jspui/handle/prefix/2098.
Texto completo da fonteResumo:
Made available in DSpace on 2017-07-24T19:38:06Z (GMT). No. of bitstreams: 1
Renata Olegario.pdf: 5279781 bytes, checksum: 47c1e5b7166f5caec9a3a371cfe659e3 (MD5)
Previous issue date: 2012-03-02Conselho Nacional de Desenvolvimento Científico e Tecnológico
This study focused on the Cerium oxide (CeO2) based pigmenting systems, doped with Praseodymium oxide (Pr6O11) and hematite (Fe2O3 – iron oxide) synthesized through the solid state reaction (OM – oxide mixture) and the Pechini method. Simultaneously, CeO2-Pr6O11-Fe2O3 ternary system pigments were synthesized through OM, with the addition of mineralizers. The samples synthesized through OM were wet homogeneized, in isopropyl alcohol, in a horizontal ball mill for 18 hours and dried in oven at 110 C, then thermally treated at 1300 ºC for 3 hours. In samples synthesized through the Pechini method, the process started from the synthesis of the polymeric resin, formed by the citric acid reaction, glycol ethyl, water and the desired oxide salts, kept in thermal blanket at 150 C, under constant agitation for 2 hours, following two thermal treatments at 300 C for 2 hours, and then one at 900 C for 3 hours. After the thermal treatment the pigmenting systems were characterized through XRD, UV-Vis reflectance spectroscopy, scanning electronic microscopy, Raman spectroscopy and thermal analysis, determining the phases present, the colorimetric parameters, band gap values, micro-structural agglomerations and thermal and chemical stability to glass enamel. Single phase pigments were obtained in the binary system CeO2-Pr6O11, with addition of up to 10% Pr6O11 synthesized through OM and up to 3% Pr6O11 synthesized through the Pechini method, whereas the binary system CeO2-Fe2O3, presented single phase only in OM synthesis, with concentrations up to 2% of Fe2O3. More intense shades were obtained in pigments with addition of up to 5% mol praseodymium oxide in the CeO2-Pr6O11 system, and with up to 3% mol iron oxide in the CeO2-Fe2O3 system. The ternary system CeO2-Pr6O11-Fe2O3 presented secondary phase PrFeo3, remaining this phase even with the addition of mineralizers. The pigments applied to low temperature frits (LTF) and windscreen glass (WSG) showed chemically and thermally resistant at 800 C, free of surface defects on the ceramic plates, presenting better dispersion and color homogeneity.
A presente pesquisa estudou os sistemas pigmentantes à base de óxido de cério (CeO2) dopados com óxido de praseodímio (Pr6O11) e hematita (Fe2O3 - óxido de ferro), sintetizados pelo método de reação de estado sólido (mistura de óxidos - MO) e pelo método Pechini. Paralelamente foram sintetizados pelo método MO, pigmentos do sistema ternário CeO2-Pr6O11-Fe2O3 com adição de mineralizadores. As amostras sintetizadas por MO foram homogeneizadas a úmido, em álcool isopropílico, em um moinho de bolas horizontal por 18 horas e secas em estufa a 110 C, e tratadas termicamente a 1300 C por 3 horas. Nas amostras sintetizadas pelo método Pechini partiu-se da síntese da resina polimérica, formada pela reação de ácido cítrico, etileno glicol, água e os sais contendo os íons metálicos dos óxidos pretendidos, mantida em manta térmica a 150 C, sob agitação constante, por 2 horas, sendo tratadas termicamente duas vezes a 300 C por 2 horas, e, na sequência, a 900 C por 3 horas. Após tratamento térmico os sistemas pigmentantes foram caracterizados por difração de raios X, espectroscopia de reflectância na região do UV-Vis, microscopia eletrônica de varredura, espectroscopia Raman e análise térmica, sendo determinadas as fases presentes, os parâmetros colorimétricos, valores de band gap, aglomerações micro estruturais e a estabilidade térmica e química frente à esmaltação vítrea. Pigmentos de fase única foram obtidos no sistema binário CeO2-Pr6O11, com adição de até 10% de Pr6O11 sintetizado por MO e com até 3% de Pr6O11 sintetizado por Pechini; já no sistema binário CeO2-Fe2O3, fase única somente em sínteses por MO, com concentrações até 2% de Fe2O3. Tonalidades mais intensas foram obtidas nos pigmentos com adição de até 5% mol de óxido de praseodímio no sistema CeO2-Pr6O11, e com adição de até 3% mol de óxido de ferro no sistema CeO2-Fe2O3. O sistema ternário CeO2-Pr6O11-Fe2O3 apresentou fase secundária PrFeO3, persistindo esta fase mesmo com adição de mineralizadores. Os pigmentos aplicados em frita de baixa temperatura (FBT) e vidro de pára-brisa (VPB) se mostraram resistentes química e termicamente a 800 ºC, sem presença de defeitos superficiais nas placas cerâmicas, apresentando melhor dispersão e homogeneidade da cor.
5
Casali, Graziela Pereira. "Pigmentos cerâmicos nanométricos a base de CeO2 dopado com Pr6O11, NiO e CoO". Universidade Federal de São Carlos, 2005. https://repositorio.ufscar.br/handle/ufscar/6362.
Texto completo da fonteResumo:
Made available in DSpace on 2016-06-02T20:35:08Z (GMT). No. of bitstreams: 1
TeseGPC.pdf: 5610493 bytes, checksum: 3cf52d4bb8017a76750282c2d68151d1 (MD5)
Previous issue date: 2005-09-30Universidade Federal de Minas Gerais
In the last few years, the study of ceramic materials has increased very fast, mainly studies related to advanced ceramics. The several applications of these materials as ceramic pigments in nanometric scale justify more and more the need for a better understanding of the influence of the dopant addition on the final properties. In this present work, it was studied structural and morphological properties of ceramic pigments based on CeO2 doped with different molar percentages of praseodymium, nickel and cobalt. These properties were also analyzed under the influence of oxidizer (O2) and inert (N2) atmospheres applying different calcination temperatures. The goal of this work was to obtain nanosized ceramic pigments with. The chemical route adopted to obtain materials was the polymeric precursor method. It was obtained stable nanosized pigments, being observed the predominance of the dark red, brown and gray colors for systems doped with praseodymium, nickel and cobalt, respectively.
Nos últimos anos, o estudo de materiais cerâmicos vem evoluindo muito rapidamente, principalmente os estudos relacionados com cerâmicas avançadas. As diversas aplicações envolvendo estes materiais, tal como pigmentos cerâmicos com partículas nanométricas, justificam cada vez mais a necessidade de uma melhor compreensão da influência da adição de dopantes nas propriedades finais. No presente trabalho propõe-se analisar e estudar as propriedades estruturais e morfológicas de pigmentos cerâmicos a base de CeO2 dopado com diferentes porcentagens molares de praseodímio, níquel e cobalto. Estas propriedades, também foram analisadas sob a influência da adição de atmosfera oxidante (O2) e inerte (N2) nas diferentes temperaturas de calcinação. Um dos principais objetivos foi o de obter pigmentos cerâmicos com tamanho de partícula nanométrica. O processo químico adotado para a obtenção dos pós foi o método dos precursores poliméricos. Foram obtidos pigmentos nanométricos estáveis, observando-se a predominância das cores vermelho marrom e cinza escuro para os sistemas de céria dopados com praseodímio, níquel e cobalto, respectivamente.
6
De, Rancourt Yoann. "Dispersion de charges d'oxydes de terres rares, Er2O3 et Pr6O11, dans une matrice polymère". Thesis, Montpellier 2, 2013. http://www.theses.fr/2013MON20202.
Texto completo da fonteResumo:
Ce travail de thèse porte sur l'incorporation de charges minérales d'oxyde d'erbium, Er2O3, et d'oxyde de praséodyme, Pr6O11, dans une matrice polymère de type élastomère, ceci dans le cadre d'un projet industriel de remplacement du plomb dans des équipements de radioprotection. L'objet de cette thèse était d'améliorer la dispersion des charges au sein de la matrice par le biais de procédés de traitements chimiques de ces particules. Divers types de fonctionnalisations de surface ont été employés afin de compatibiliser celles-ci avec une matrice organique, notamment par greffage de composés de type acides phosphoniques. Plusieurs acides phosphoniques ont ainsi pu être utilisés avec succès pour la fonctionnalisation des deux types de charges. La caractérisation de ces différentes fonctionnalisations représente une part importante de ce projet. Des techniques d'analyse innovantes, aussi bien directes qu'indirectes ont été employées dans ce but, à savoir de la Py-GC/MS pour la détection des composés ancrés à la surface des charges, de la fluorescence X et de la spectroscopie infrarouge dans un objectif de quantification, mais aussi des études cinétiques de sédimentation des charges dans un milieu liquide organique. Finalement, des composites ont pu être obtenus par mélange des charges, traitées et non traitées, avec une matrice polyuréthane. Des essais de traction ont permis de montrer clairement une amélioration des propriétés mécaniques de certains des composites, grâce à la fonctionnalisation des charges par les acides phosphoniquesThis thesis focuses on the incorporation of mineral fillers of erbium oxide, Er2O3, and praseodymium oxide, Pr6O11, in an elastomeric polymer matrix, in the context of an industrial project to replace the lead in radiation protection equipment. The actual purpose of this thesis was to improve the dispersion of the fillers in the matrix through chemical treatment processes of these particles. Various types of surface functionalization were used to compatibilize them with an organic matrix, in particular by grafting compounds such as phosphonic acids. Hence, several phosphonic acids have been successfully used for the functionalization of both types of fillers. The characterization of these functionalizations is an important part of this project. Innovative analysis techniques, both direct and indirect have been used for this purpose, namely Py-GC/MS to detect the chemical compounds anchored to the surface of the fillers, X-ray fluorescence and FTIR spectroscopy with a quantification target, but also a study of sedimentation kinetics of the fillers in an organic medium. Finally, composites were obtained by mixing the fillers, untreated and treated, with a polyurethane matrix. Tensile tests have clearly shown an improvement of mechanical properties for some of the composites, due to the functionalization of the fillers by phosphonic acids
7
Beynon, Richard Jonathon. "'Ugly Lovely' : being a work of creative writing with accompanying critical commentary". Thesis, University of Sussex, 2013. http://sro.sussex.ac.uk/id/eprint/47227/.
Texto completo da fonteResumo:
The title of the creative work is ‘Ugly Lovely'. The 20,000 word critical discussion of the creative piece has no title, other than that it offers a critical consideration of the relationship between the literary composition and contemporary or traditional achievements in the genre. The creative work concerns a taxi driver named Don, living in the south Wales port of Swansea. He finds his life and culture unsatisfying, but is unable, because of his own lack of will and energy, to leave. His passengers, some of whose lives have an orbit beyond the small-ish Welsh city, bring his sense of dissatisfaction into focus. The work follows a sequence of episodes during which the driver meets and reflects on the remarks and actions of subsequent passengers, and considers his own family and life. Structurally, the work takes the form of a story-cycle concerning or emanating from Don or from the passengers in his taxi. The passenger narratives sometimes present complete stories or self-contained episodes, sometimes broken or partial narratives. All episodes stand in relief against the other fractured narrative running through the work, the driver's self-reflection and re-evaluation of the family life and up-bringing. Thus: 1) Taxi stories – involve the characters who step in and out of the taxi. These stories centre upon a cast of characters who enter the driver's working world, but also present to reader the a secondary cast of characters introduced by the passengers, through the stories they tell. The role and status of the driver shifts as the work progresses. At the close of the work, though the driver's future, like the futures of his town and nation, remains unassigned, he approaches it with a firmer sense of purpose (if not direction). 2) Connected family narratives - gradually present fragments from the history and lives of the main figures in the driver's family. Through these frequently conflicting and contesting narratives, the work delivers a number of perspectives on the history of the town in which the family lived and through which the taxi stories now move. These separate narratives are arranged out of linear sequence, in an order which has greater correspondence to their emotional importance, and in response to triggers set within the various passenger narratives. The contesting nature of the family stories raises questions in the reader's mind about which narratives are privileged, and which reliable. As the work progresses, the realisation comes that none of the narratives is privileged, that all may be unreliable and all contest for dominance and primacy in the driver's mind. The critical element In providing a ‘critical consideration of the relationship between the literary composition and contemporary or traditional achievements in the genre', this commentary will present I. a general introduction to the creative work, II. discussion of the narrative form and organisation of the work, comprising: a. consideration of the ways that the work is shaped by modernist concerns and structures, particularly those of the modernist ‘city novel', b. consideration of the way that the work is structured to present a collection of linked and inter-related narratives, broadly referred to as a short-story sequence III. discussion of the extent to which the work can be placed within the canon of Welsh writing in English; in particular: a. the ways in which the work constitutes a recognisable piece of Welsh writing in English and the extent to which it treats the concerns of one of the national literatures b. the ways in which the work makes considered and constructive use of its setting in Swansea.
8
Worley, Christiana. "Rising Star". Thesis, St Andrews, 2007. http://hdl.handle.net/10023/321.
Texto completo da fonte
9
Radcliffe, Mark. "What happens to bruised or damaged nurses?" Thesis, University of Sussex, 2014. http://sro.sussex.ac.uk/id/eprint/51407/.
Texto completo da fonteResumo:
This project is largely creative in nature offering the first half of a now published novel entitled Stranger Than Kindness and a textual and critical analysis of that novel that explores the experience of traumatized or ‘bruised' nurses. The novel, half set in 1989 and half set in 2013, follows the clinical and personal traumatization of two nurses and their tentative steps towards restoration. It reveals a backdrop of a sometimes subtle institutionalized brutality and a culture that lends itself to the individual collection or absorption of difficulty. It uses gentle magical realism to counterpoint the gritty backdrop of the pre-community care asylum of the 1980s and the neoliberal, free market setting of the modern world of healthcare in the second half of the book. It's dénouement is a celebration of whimsy in the face of hard industrialized science. The novel reveals the capacity of the nurse to collect emotional residue, trauma or bruising and be both changed and hurt by the experience of care to the point of being damaged. It essentially resorts to poetics to explore the ‘felt' world of the nurse or carer. In tone and in theme the book is a novel of the emotions. Valuing an emotional literacy over medical rationalism, it seeks to gently reclaim the idea that caring for others is a pursuit or enactment of embodied wisdom rather than just the exercising of scientific knowledge. The critical discussion uses the text of the novel to make three observations in relation to the research question. The first is that the question is political. It is strikingly unaddressed in policy responses to ‘The Francis Report' (2013) and perhaps in terms of mainstream research it is unaskable because it addresses the felt world. In the same way that the novel explores a hierarchy of values in the caring profession, the ensuing critical discussion reveals a hierarchy of knowledge. The second observation is that it is our tacit understanding of what reason is and how we make sense of the world we have constructed that helps make questions about bruised or damaged nurses somehow beyond convention. Iain McGilchrist's The Master And His Emissary (2009) offers a way of making sense of that by exploring the contemporary imbalance between the logical and linear thinking of the left hemisphere and the integrative and imaginative right hemisphere. We have come to prize the measurable over the experiential or contextual and reflective to such an extent that we organize the world accordingly. The third observation, which emerges from the first two and the novel, is the suggestion that nursing is assuming an ill-fitting Cartesian epistemology that cannot do justice to its breadth or holistic need. I suggest that a philosophy that took clearer account of the body, the senses and the felt world would more comfortably accommodate and legislate for the needs of the nurse and the profession of nursing. An embodied realism (Lakoff and Johnson, 1999) that emerges from Damasio (2000, 2012) and Merleau-Ponty (2005) offers the potential to restore a more balanced and less reductionist philosophy that might enable a fuller and more person-centred response to the nursing crises. A further more general observation the thesis makes is that fiction can inform social science and offers a way in which it can do that. Thus it finds itself in a tradition of narrative inquiry (Clandinin and Connelly, 2000). However, it also notices the potential paradox in valuing art as a sociological resource: something that offers us knowledge, meaning and even moral review while turning to cognitive neuroscience to legitimize that methodology.
10
Eckstein, Sue. "Homage or damage - the scope and limitation of autobiographical fiction". Thesis, University of Sussex, 2011. http://sro.sussex.ac.uk/id/eprint/7583/.
Texto completo da fonteResumo:
The thesis comprises a novel – Interpreters and a critical commentary. Interpreters The novel explores the notion of identity, the interpretation of the past, the secrets and lies inherent in families, the parent/child relationship and the collective and personal guilt of a generation who grew up in Nazi Germany. It is a work of fiction that has grown out of memory and imagination, informed by original research, family memoirs, and oral history. Interpreters tells the story of Julia Rosenthal, a successful anthropologist, who returns to the suburban estate of her 1970s childhood. During her journey, both actual and emotional, the unspoken tensions that permeated her seemingly conventional family life come flooding back. Trying to make sense of the secrets and half truths, she is forced to question how she has raised her own daughter – with an openness and honesty that Susanna has just rejected in a very public betrayal of trust. Meanwhile her brother, Max, is happy to forge an alternative path through life, leaving the past undisturbed. In a different place and time, another woman is engaged in a painful dialogue with an unidentified listener, struggling to tell the story of her early years in wartime Germany and gradually revealing the secrets she has carried through the century. Critical commentary Autobiographical fiction as a genre can be laden with moral and ethical issues, and I have made their examination the centrepiece of my critical commentary. I have focused on the contractual understanding of the relationship between the author, reader and those written about, the issue of who “owns” memory, and issues relating to a writer's responsibility – and the limits of that responsibility – to their sources. I have examined the tension between “truth” and “fiction” and whether this is something that is particularly problematic in the writing and reading of autobiographical fiction. I have also considered what happens to the writer and the reader when the rules are broken by fake memoir, particularly fake memoir related to recent history and, most particularly, to the Second World War and its aftermath. My reflections on my own novel and its genesis are complemented throughout by discussions of other, mostly twentieth century, authors' and critics' works.
Livros sobre o assunto "Pr6111"
1
Council, British, ed. William Golding. 2a ed. Tavistock, U.K: Northcote House/British Council, 2006.
Encontre o texto completo da fonte
2
Theatre, Chichester Festival, Headlong Theatre e Royal Court Theatre, eds. Enron. London: Methuen Drama, 2009.
Encontre o texto completo da fonte
3
Hugh, MacDiarmid. The raucle tongue: Hitherto uncollected prose. Manchester [England]: Carcanet, 1996.
Encontre o texto completo da fonte
4
Edward, Mendelson, ed. Selected poems. New York: Vintage International, 2007.
Encontre o texto completo da fonte
5
Edward, Mendelson, ed. Collected poems. New York: Vintage International, Vintage Books, 1991.
Encontre o texto completo da fonte
6
1945-, McCarthy Patrick A., e Tiessen Paul, eds. Joyce/Lowry: Critical perspectives. Lexington, Ky: University Press of Kentucky, 1997.
Encontre o texto completo da fonte
7
Luxe. Salt Publishing, 2013.
Encontre o texto completo da fonte
8
Fix Up. Methuen Publishing, 2005.
Encontre o texto completo da fonte
9
Us. Faber & Faber, Incorporated, 2018.
Encontre o texto completo da fonte
10
Disclaimer. HarperCollins Publishers, 2015.
Encontre o texto completo da fonteCapítulos de livros sobre o assunto "Pr6111"
1
Ibrahim Ghoneim, Amina. "Applications of Nano-Ferrites in Medicine". In Applications of Ferrites [Working Title]. IntechOpen, 2024. http://dx.doi.org/10.5772/intechopen.1003615.
Texto completo da fonteResumo:
Nano-ferrites are elegant and smart nanoparticles. Biomedical implementations of nano-ferrites include cell signaling, hyperthermia, magnetic resonance imaging (MRI), nanorobots, drug delivery, anti-cancer function, anti-fungi, anti-bacteria, biosensors, brain stimulation, wound healing, etc. Nano-ferrites showed anticancer features towards various types of cancer cells, such as breast cancer. They have been used for drug delivery as well as drug release. Magnetic hyperthermia is a successful approach in cancer treatment, where nano-ferrites have been used under the influence of external magnetic fields. Nano-ferrites are used as magnetic resonance imaging (MRI) contrast agents. Furthermore, nano-ferrites have been involved in the magnetic nanorobots and biosensors industries. Superparamagnetic nanocrystals including manganese nano-ferrites have been utilized in the activation of thermos-sensitive transient receptor potential vanilloid 1 (TRPV1) channels to attain further brain stimulation. The chemo-genetic modulation of targeted neural circuits using superparamagnetic nano-ferrite particles provides a novel strategy for brain stimulation so as to investigate brain functions and neurological diseases. Moreover, they have antibacterial and antifungal activity against several types of bacteria and fungi, such as E. coli and Candida albicans. Pr6O11/Fe2O3/GO@PCL film nanocomposites have been used in skin wound healing treatment; thence, these smart new nanocomposites could be utilized in the advancement of wound healing applications.
Trabalhos de conferências sobre o assunto "Pr6111"
1
Patterson, Adam V., Jagdish Jaiswal, Kendall Carlin, Maria R. Abbattista, Christopher P. Guise, Shevan Silva, Ho Lee et al. "Abstract B278: PR610: A novel hypoxia-selective tyrosine kinase inhibitor in phase I clinical trial." In Abstracts: AACR-NCI-EORTC International Conference: Molecular Targets and Cancer Therapeutics--Oct 19-23, 2013; Boston, MA. American Association for Cancer Research, 2013. http://dx.doi.org/10.1158/1535-7163.targ-13-b278.
Texto completo da fonte