Thesis (D. Min.)--Harding University Graduate School of Religion, 2005. / "May 2005." Includes bibliographical references ( leaves 209-221).

Thesis (D. Min.)--Midwestern Baptist Theological Seminary, 2006. / Abstract. Includes bibliographical references (leaves 67-68).

Thesis (Ph. D.)--University of Missouri-Columbia, 2003. / Vita. Includes bibliographical references (leaves [395]-404). Also available on the Internet.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2017-12-01T21:10:54Z No. of bitstreams: 1 IgaraMeloDantas_DISSERT.pdf: 2079350 bytes, checksum: aeb0b4b5149d554ef039c9221d5519a4 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2017-12-05T00:21:36Z (GMT) No. of bitstreams: 1 IgaraMeloDantas_DISSERT.pdf: 2079350 bytes, checksum: aeb0b4b5149d554ef039c9221d5519a4 (MD5) / Made available in DSpace on 2017-12-05T00:21:36Z (GMT). No. of bitstreams: 1 IgaraMeloDantas_DISSERT.pdf: 2079350 bytes, checksum: aeb0b4b5149d554ef039c9221d5519a4 (MD5) Previous issue date: 2017-07-28 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / Esta disserta??o apresenta um estudo panor?mico acerca da oralidade no romance africano, particularmente, na obra Niketche: uma hist?ria de poligamia (2004), da mo?ambicana Paulina Chiziane, considerada a primeira escritora de seu pa?s a publicar neste g?nero. Investigamos a forma sob a qual o corpo da narra??o articula as tr?s categorias que desempenham um importante papel para a sensibilidade e a percep??o do oral no texto escrito: a voz, a letra e o gesto. Pela natureza do corpus escolhido, tal estudo adentrou discuss?es acerca do papel da mulher enquanto escritora, tecendo interpreta??es concernentes aos discursos ficcional, hist?rico e cultural sobre a mulher e associando o espa?o da cria??o art?stica a um terreno poss?vel de emergir novas formas de representa??o para o feminino. Os instrumentos que serviram de base para nossas reflex?es encontram-se ancorados nas postula??es da teoria liter?ria em torno da oralidade, como os escritos de Paul Zhumthor (2000) e Hampat?-B? (1980), al?m das teorias de cunho cultural e p?s-colonial de Homi k. Bhabha (2003) e Gayatry Spivak (2010). / This dissertation presents a panoramic study concerning the orality in African novel, particularly, in the book called Niketche: uma hist?ria de poligamia (2004), from Mozambican writer Paulina Chiziane, considered one of the first novelist from her country to publish in this genre. We investigated the form in which the narration embodies and articulates the three categories that features an important role to the sensitivity and the oral perception of the written text: the voice, the letter and the gesture. By the nature of the chosen corpus, such study permeated discussions about the role of the woman as a writer, weaving interpretations concerning the fictional, historic and cultural discourses about the women and associating the space of the artistic creation as a possible territory in which new forms of representation emerge concerning the feminine. The instruments that served as basis to our reflections are anchored in the postulates of the literary theory about the orality, such as the works of Paul Zumthor (2000) and Hampat?-B? (1980), as well as the cultural and post-colonial studies of Homi K. Bhabha (2003) and Gayatry Spivak (2010).

李國威. / "2008年11月". / "2008 nian 11 yue". / Thesis (M.Phil.)--Chinese University of Hong Kong, 2008. / Includes bibliographical references (leaves 164-168). / Abstracts in Chinese and English. / Li Guowei. / 摘要 --- p.3 / Abstract --- p.3 / 導論 --- p.8 / Chapter 甲、 --- 寫作背景 --- p.8 / Chapter 乙、 --- 論旨細節 --- p.12 / Chapter 丙、 --- 論文佈局 --- p.19 / Chapter 甲部： --- 早期墨家的人性論 --- p.21 / Chapter 甲、 --- 要旨回顧 --- p.21 / Chapter 乙、 --- 理路鋪陳 --- p.21 / Chapter 一、 --- 墨家如無人性論所弓丨發的問題 --- p.22 / Chapter 二、 --- 「自利假說」如爲真所弓丨發的問題 --- p.23 / Chapter 三、 --- 「先前性向說」如爲真所弓丨發的問題 --- p.23 / Chapter 第一章： --- 墨家無人性論? --- p.26 / Chapter 甲、 --- 徐氏的觀點；「人性」的歧義 --- p.26 / Chapter 乙、 --- 蔡氏的觀點；「根據」的歧義 --- p.28 / Chapter 丙、 --- 萬氏的觀點；斷言的轉變 --- p.30 / Chapter 一、 --- 「人性」意義的釐清 --- p.31 / Chapter 二、 --- 萬氏斷言的漏洞 --- p.32 / Chapter 三、 --- 斷言內涵的轉變 --- p.34 / Chapter 四、 --- 人類道德性向的性質 --- p.35 / Chapter 五、 --- 道德性向的作用 --- p.39 / Chapter 六、 --- 道德性向的補充：道德客觀主義的傾向 --- p.40 / Chapter 七、 --- 其他性向的作用 --- p.46 / Chapter 八、 --- 反駁萬氏斷言的破壞性論果 --- p.47 / Chapter 九、 --- 德福一致的世界觀 --- p.48 / Chapter 十、 --- 各種性向在社會轉變中所可能扮演的角色 --- p.50 / Chapter 丁、 --- 結語：可塑性的限制及必要 --- p.51 / Chapter 第二章： --- 墨家認爲自利是人類主要的推動力來源? --- p.53 / Chapter 甲、 --- 「自利假說」的內涵 --- p.53 / Chapter 乙、 --- 「自利假說」的證據之一：早期墨家的政治理論 --- p.54 / Chapter 一、 --- 「自利假說」於此不能成立的表面理由 --- p.55 / Chapter 二、 --- 「以利訓義」的還原主義式退守方法及其限制 --- p.56 / Chapter 三、 --- 對於方氏第一道問題的回應 --- p.58 / Chapter 四、 --- 對於方氏第二道問題的回應 --- p.63 / Chapter 丙、 --- 「自利假說」的證據之二 ：「兼愛」「難而不可」的回應 --- p.64 / Chapter 一、 --- 「難而不可」的反駁之內容回顧及解說 --- p.64 / Chapter 二、 --- 「自利假說」在上述四項斷言中的位置 --- p.66 / Chapter 三、 --- 「難而不可」之論的核心 --- p.67 / Chapter 四、 --- 小結 --- p.70 / Chapter 丁、 --- 「自利假說」的證據之三：「託友論證」 --- p.72 / Chapter 一、 --- 「託友論證」的回顧 --- p.72 / Chapter 二、 --- 「託友論證」的要旨 --- p.73 / Chapter 三、 --- 「託友論證」的效力 --- p.74 / Chapter 四、 --- 「自利假說」以外的詮釋選項 --- p.75 / Chapter 戊、 --- 結語：「自利」在《墨子》中的地位 --- p.75 / Chapter 第三章： --- 墨子不相信人類共有一些先前的性向用以實踐「兼愛」？ --- p.77 / Chapter 甲、 --- 「先前性向說」的論據 --- p.77 / Chapter 一、 --- 反面證據 --- p.77 / Chapter 二、 --- 正面證據 --- p.78 / Chapter 乙、 --- 對於「先前性向說」的論據之反駁 --- p.78 / Chapter 一、 --- 「自利」這種先前性向的作用 --- p.78 / Chapter 二、 --- 先前已有的道德性向之作用 --- p.79 / Chapter 三、 --- 正面證據中最後兩點的比喻之解說 --- p.82 / Chapter 四、 --- 「親疏有序」的情感性向與「兼愛」的實踐 --- p.83 / Chapter 丙、 --- 「先前性向說」所構成的問題之癥結所在 --- p.84 / Chapter 一、 --- 基於心理狀態不同的行爲區分 --- p.85 / Chapter 二、 --- 兼愛」實踐的歸類及當中蘊含的問題 --- p.85 / Chapter 丁、 --- 各家對於「兼愛」的詮釋 --- p.86 / Chapter 戊、 --- 「先前性向說」所構成的破壞力 --- p.88 / Chapter 一、 --- 由自利性向所發動的「兼愛」所蘊含的問題 --- p.89 / Chapter 二、 --- 由道德性向所發動的「兼愛」所蕴含的問題 --- p.90 / Chapter 三、 --- 對於上述問題的可能回應及由此弓丨伸的後果 --- p.91 / Chapter 己、 --- 回應的第一步：「兼愛」的本義 --- p.92 / Chapter 一、 --- 「兼愛」的新詮釋 --- p.92 / Chapter 二、 --- 與新詮釋相左的文句所構成的問題 --- p.93 / Chapter 三、 --- 以上問題的回應 --- p.94 / Chapter 四、 --- 節約風¯‘ة與新詮釋之間的張力 --- p.95 / Chapter 五、 --- 「孝子」之義與「孝子」之事 --- p.97 / Chapter 六、 --- 「託友論證」與新詮釋之間的張力 --- p.101 / Chapter 七、 --- 「朋友」之義與「朋友」之事 --- p.101 / Chapter 八、 --- 家庭在「兼愛」的實踐當中所處的地位 --- p.103 / Chapter 九、 --- 與新詮釋相左的文句之新解：一種思考模式 --- p.104 / Chapter 十、 --- 「兼愛」與情感的關係 --- p.105 / Chapter 十一、 --- 「交相利」的意義 --- p.108 / Chapter 庚、 --- 回應的第二步：道德判斷、行爲與動機三者的關係 --- p.109 / Chapter 一、 --- 早期墨家所謂的道德欲求之性質 --- p.110 / Chapter 二、 --- 從倪氏思路發展下來的攻擊所要面對的兩難 --- p.111 / Chapter 三、 --- 對倪式攻擊所作的修補 --- p.113 / Chapter 四、 --- 可能回應之一：推翻上文的詮釋 --- p.114 / Chapter 五、 --- 可能回應之二：採取道德判斷的「非認知主義」 --- p.115 / Chapter 六、 --- 可能回應之三：承認「反休謨主義」 --- p.117 / Chapter 七、 --- 支持「反休謨主義」的理據 --- p.118 / Chapter 八、 --- 早期墨家對於道德判斷、行爲及動機關係的立場 --- p.119 / Chapter 辛、 --- 回應的第三步：關於工夫的觀點 --- p.120 / Chapter 一、 --- 餘下的兩點問題 --- p.121 / Chapter 二、 --- 對於第一點的回應：情感性向的調度 --- p.121 / Chapter 三、 --- 對於第二點的回應：「依法練習」的重要性 --- p.122 / Chapter 壬、 --- 結語：「一本」與「二本」 --- p.126 / Chapter 乙部： --- 早期墨家的工夫論 --- p.129 / Chapter 甲、 --- 「工夫」意義的限定 --- p.129 / Chapter 乙、 --- 背景淺介 --- p.130 / Chapter 第四章： --- 早期墨家所提倡之工夫的性質及內容 --- p.131 / Chapter 甲、 --- 外在型工夫的推動效力 --- p.131 / Chapter 一、 --- 傳統的觀點 --- p.131 / Chapter 二、 --- 支持外在型工夫具有推動效力的理由 --- p.132 / Chapter 乙、 --- 外在型工夫的道德價値 --- p.134 / Chapter 一、 --- 傳統的觀點 --- p.134 / Chapter 二、 --- 支持外在型工夫具有道德價値的理由 --- p.135 / Chapter 丙、 --- 早期墨家所建議的工夫之一 ：「賞罰毀譽」 --- p.138 / Chapter 一、 --- 「賞罰毀譽」在早期墨家工夫論中的位置及作用 --- p.140 / Chapter 二、 --- 節約風¯‘ة對「賞罰毀譽」所構成的問題 --- p.141 / Chapter 丁、 --- 早期墨家所建議的工夫之二 ：「¯‘ة同制度」 --- p.144 / Chapter 一、 --- 「¯‘ة同制度」的新詮釋 --- p.147 / Chapter 二、 --- 「集體學習」可能潛在的問題 --- p.149 / Chapter 三、 --- 「¯‘ة同制度」的具體操作 --- p.152 / Chapter 四、 --- 「¯‘ة同制度」對於人類性向的影響 --- p.153 / Chapter 五、 --- 人民在「¯‘ة同制度」中所起的作用 --- p.155 / Chapter 六、 --- 小結 --- p.156 / Chapter 戊、 --- 結語：終極「法儀」所可能弓丨伸的問題 --- p.157 / 結論 --- p.159 / Chapter 甲、 --- 人性論、工夫論及規範理論的關係 --- p.159 / Chapter 乙、 --- 「合理性」的意義 --- p.160 / Chapter 丙、 --- 早期墨家的人性論、工夫論及主要規範的槪要回顧 --- p.161 / Chapter 丁、 --- 三道假然句式的真確性 --- p.162 / 附錄 / 參考文獻目錄 --- p.164 / 外文著作之學者的中外文姓名對照表 --- p.167 / 鳴謝 --- p.168

Yong-mo Yu (1890-1981) was a supporter of religious pluralism in Korea, advocating for a syncretistic conception of God; and for interfaith spiritual renewal, during a period marked by the rejection of these concepts. A study of his work enriches our conception of the 20th century Korean Christianity. The main goal of my dissertation is to first analyze Yu's theological understanding of God and examine it in relation to the three East Asian major religious traditions as well as a Western ontological understanding of the ultimate reality; and second, through such analyses, to discuss the significance and challenges of Yu's pluralistic theology and spirituality. Yu's own definition of God as Opshi-gyeshin-Haneunim (God who exists as Non-Being) is an ontological understanding of the ultimate reality, which is very different from conservative Korean Protestantism's understanding of God. Yu's understanding of God is very similar to Robert C. Neville's understanding of God as the creator in that both of them define the ultimate reality as absolute Nothingness or Emptiness transcending both being and non-being. Yu's understanding of God was also based on the East Asian religious traditions which are Confucianism, Buddhism, and Taoism. Therefore, Yu defines Christian God as T'ai-chi and Wu-chi, nothingness, and Tao which are concepts that Yu borrows from the East Asian religions. Yu's concept of God as Opshi-gyeshin-Haneunim was formed and developed based on his own spiritual experiences, for example, his experience of spiritual union with God. At the same time, his theological reflection on the ultimate reality also had great effect on his spirituality. In the same tenor, the pluralistic characteristics of Yu's theology and spirituality are the result of Yu's creative combination of his ontological understanding of the ultimate reality transcending various religious contexts and the East Asian spirituality focusing on spiritual discipline to develop the divine power given to human beings. Yu's creative integration of the ontological analysis of God and the East Asian spiritual tradition can provide a new perspective to Korean conservative Protestantism in understanding other religions, and suggest a new type Christian spirituality in plural Korean contexts. / 2017-01-12T00:00:00Z

Submitted by Rodrigo Martins Cruz (rodrigo.cruz@ufvjm.edu.br) on 2016-01-06T18:54:10Z No. of bitstreams: 2 license_rdf: 22974 bytes, checksum: 99c771d9f0b9c46790009b9874d49253 (MD5) mayara_rodrigues_lessa.pdf: 2887620 bytes, checksum: 65d145401884724e28b09bbc9441aa53 (MD5) / Approved for entry into archive by Rodrigo Martins Cruz (rodrigo.cruz@ufvjm.edu.br) on 2016-01-07T11:52:11Z (GMT) No. of bitstreams: 2 license_rdf: 22974 bytes, checksum: 99c771d9f0b9c46790009b9874d49253 (MD5) mayara_rodrigues_lessa.pdf: 2887620 bytes, checksum: 65d145401884724e28b09bbc9441aa53 (MD5) / Made available in DSpace on 2016-01-07T11:52:11Z (GMT). No. of bitstreams: 2 license_rdf: 22974 bytes, checksum: 99c771d9f0b9c46790009b9874d49253 (MD5) mayara_rodrigues_lessa.pdf: 2887620 bytes, checksum: 65d145401884724e28b09bbc9441aa53 (MD5) Previous issue date: 2014 / O caf? torrado e mo?do encontrado no mercado interno ? comercializado sob diferentes marcas, que trazem consigo uma heterogeneidade quanto ao aroma, sabor e at? o grau de torra??o. Esta diversidade de caracter?sticas est? associada a v?rios fatores, entre eles a origem dos gr?os de caf?. Considerando essas varia??es relatadas na literatura, o presente trabalho teve como objetivo realizar uma pesquisa da composi??o qu?mica e f?sico-qu?mica de caf?s comerciais em diferentes cidades da Regi?o Sudeste do Brasil. Cinquenta e oito pacotes de 250 gramas, de caf?s torrados e mo?dos acondicionados em embalagem do tipo almofada e/ou ? v?cuo foram adquiridos em diferentes cidades dos quatro Estados da Regi?o Sudeste do Brasil. Todos os produtos estavam dentro do prazo de validade e aproximadamente 58% das marcas apresentavam o selo de pureza da ABIC, enquanto 22% das marcas apresentavam o selo de qualidade da Associa??o Brasileira da Ind?stria de Caf?. As amostras foram levadas para o Laborat?rio de Tecnologia de Biomassas do Cerrado da Universidade Federal dos Vales do Jequitinhonha e Mucuri, onde foram realizadas as avalia??es de pH cujo resultado m?dio foi 5,95; acidez total titul?vel 15,03 ? 1,07(v/m)%; s?lidos sol?veis totais 1,15 ?Brix; ?ndice de colora??o com m?dia para os valores de L* de 28,87 ? 0,29, para os valores de a* de 8,99 ? 0,10 e para os valores de b* de 2,84 ? 0,21; os compostos fen?licos obtiveram uma m?dia de 4,1152 ? 0,4863 g.100g-1 e a m?dia dos flavonoides de 0,5042 ? 0,0291 g.100g-1. Os m?todos multivariados de an?lise, associados aos m?todos usando a espectroscopia na regi?o do infravermelho tem tido grandes avan?os com diversas aplica??es nas an?lises de alimentos. Com este intuito, utilizou-se a espectroscopia na regi?o do infravermelho para delinear os grupos funcionais mais representativos nas amostras de caf? analisadas com a inten??o de agrup?-las por similaridade atrav?s da estat?stica multivariada. Os resultados permitiram visualizar que poucos grupos foram formados utilizando as an?lises f?sico-qu?micas, para classificar as amostras. A An?lise das Componentes Principais foi capaz de acumular 61,98% de vari?ncia nas duas primeiras componentes e os grupos formados foram confirmados pela An?lise Hier?rquica por Agrupamento. Em rela??o aos espectros de infravermelho, as amostras foram mais agrupadas com a An?lise das Componentes Principais acumulando 41,76% da vari?ncia, os grupos das amostras foram confirmados pela An?lise Hier?rquica por Agrupamento. / Disserta??o (Mestrado) ? Programa de P?s-Gradua??o em Qu?mica, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 2014. / ABSTRACT The roast and ground coffee found in the domestic market is sold under different brands that carry with them a heterogeneity for aroma, flavor and even the degree of roasting. This diversity of characteristics is associated with several factors, including the origin of the coffee beans. Considering these variations reported in the literature, the present study aimed to perform a search of the chemical and physico-chemical composition of commercial coffees in different cities in Southeastern Brazil. Fifty-eight packages of 250 grams of roasted and ground coffee packaged in packaging the type pad and / or vacuum were acquired in different cities of the four states of southeastern Brazil. All products were within the validity period and approximately 58% of brands had the seal of purity of ABIC, while 22% of brands had the seal of the Brazilian Association of Coffee Industry Samples were taken for Laboratory Technology Biomass of the Cerrado, Federal University of the Jequitinhonha and Mucuri, which were conducted evaluations of pH where the average yield around 5.95; titratable acidity 15.03 ? 1.07 (v / m)%; total soluble solids 1.15 ? Brix; staining index and the average for the values ??of L * was 28.87 ? 0.29 for the a * values ??was 8.99 ? 0.10 and b * values ??were 2.84 ? 0.21 ; phenolic compounds were obtained an average of 4.1152 ? 0.4863 g.100g-1 and the average of flavonoids was 0.5042 ? 0.0291 g.100g-1. The multivariate analysis methods, associated with methods using spectroscopy in the infrared region has taken great strides with several applications in food analysis. For this purpose, we used spectroscopy in the infrared region to delineate the most representative functional groups in coffee samples analyzed with the intention of grouping them by similarity using multivariate statistics. The results allowed us to visualize that few groups were formed using the physicochemical analyzes to classify the samples. The Principal Component Analysis was able to accumulate 61.98% of variance in the first two components and the groups formed were confirmed by Hierarchical Cluster Analysis. Regarding the infrared spectra of the samples were further grouped with the Principal Component Analysis accumulating 41.76% of the variance, the groups of samples were confirmed by Hierarchical Cluster Analysis.

OLIVEIRA JÚNIOR, F. C. Estudo da estrutura local dos sítios de ferro em ligas Fe-Cr-Mo por espectroscopia mössbauer e difração de raios-X. 2011. 83 f. Dissertação (Mestrado em Ciência de Materiais) – Centro de Tecnologia, Universidade Federal do Ceará, Fortaleza, 2011. / Submitted by Marlene Sousa (mmarlene@ufc.br) on 2016-03-31T14:44:22Z No. of bitstreams: 1 2011_dis_fcoliveirajunior.pdf: 8710692 bytes, checksum: 7e676537adcfd9c77870a3b50950cc93 (MD5) / Approved for entry into archive by Marlene Sousa(mmarlene@ufc.br) on 2016-03-31T18:25:01Z (GMT) No. of bitstreams: 1 2011_dis_fcoliveirajunior.pdf: 8710692 bytes, checksum: 7e676537adcfd9c77870a3b50950cc93 (MD5) / Made available in DSpace on 2016-03-31T18:25:01Z (GMT). No. of bitstreams: 1 2011_dis_fcoliveirajunior.pdf: 8710692 bytes, checksum: 7e676537adcfd9c77870a3b50950cc93 (MD5) Previous issue date: 2011-06-27 / Fe-Cr-Mo alloys are widely used in the manufacture of piping for the petrochemical industry in oil transport and refining processes due to a combination of properties such as hardness, toughness, creep resistance and corrosion resistance at high temperatures. Nowadays the Fe-9Cr-1Mo alloy is the most common alloy in use. However, in some refineries with higher acidity levels, strong corrosion processes have been observed, specially in processes related to naphthenic acid corrosion. An increasing in the Molybdenum content has been pointed out as a possible solution to this problem, since the addition of this alloying element results in a better corrosion resistance. In this context, Fe-9Cr-XMo alloys with three different Molydbenum contents (X = 5, 7, 9 wt%) have been developed at LACAM - Laboratório de Caracterização de Materiais at the Universidade Federal do Ceará. The characterization of these alloys, as well as the precipitates that appear on them due to heat treatment and studies of their corrosion resistance were made through various techniques. Specifically in this work, Transmission Mössbauer Spectroscopy and X-Ray Diffraction were used in order to achieve a better understanding of the structure changes of the alloys when they are subjected to different service conditions in the temperature range from 450°C to 650°C. The results led to the conclusion that the distribuition of the alloy elements in the matrix is influenced by the molibdenum content, the temperature and the treatment time. The precipitates present in the ASTM A213 grade T91, used for comparation with E1, E2 and E3 alloys, have been extracted and characterized as well. The presence of this precipitates changes the distribuition of the alloy elements in the matrix. The analysis of the influence of the impurity elements in the structure of the alloys was investigated by a model of first and second neighbors. The changes in the magnetic hyperfine field is proportional to the number of impurity atoms in the neighborhood of the iron sites. The distribuition of the alloy elements in the matrix is direct related to the distribution of the magnetic hyperfine field. The probabilities associated to the values of hiperfine field allow for a better understanding of the structure of the alloys. / Ligas Fe-Cr-Mo são amplamente utilizadas na fabricação de tubulações para a indústria petroquímica nos processos de transporte e refino do petróleo devido a uma combinação de propriedades como dureza, tenacidade e resistência à fluência e à corrosão em altas temperaturas. Atualmente, a liga Fe-9Cr-1Mo é a mais comumente utilizada. Contudo, em refinarias de petróleo que apresentam altos índices de acidez, tem-se observado, de maneira acentuada, processos de corrosão nessas ligas, principalmente processos relacionados à acidez naftênica. Um aumento no teor de molibdênio da liga tem sido apontado como uma possível solução para este problema, visto que a adição desse elemento na liga resulta em uma melhor resistência à corrosão. Nesse contexto, foram desenvolvidas no LACAM - Laboratório de Caracterização de Materiais da UFC, ligas Fe-9Cr-XMo com três diferentes percentuais em peso de molibdênio (X = 5, 7, 9 wt%). A caracterização dessas ligas, bem como dos precipitados que nelas surgem devido aos tratamentos térmicos, e o estudo da sua resistência à corrosão serão feitos através de várias técnicas. Neste trabalho, especificamente, foi utilizada a Espectroscopia Mössbauer e a Difração de Raios-x para uma melhor compreensão das mudanças na estrutura das ligas quando submetidas às diferentes condições de serviço dentro da faixa de temperatura de 450ºC a 650ºC. Os resultados obtidos permitem concluir que a distribuição dos elementos de liga na matriz é influenciada pelo teor de molibdênio, pela temperatura e o pelo tempo de tratamento. Também foram extraídos e caracterizados os precipitados da liga comercial ASTM A213 da classe T91 utilizada para efeito de comparação com as ligas E1, E2 e E3. A presença destes precipitados altera a distribuição dos elementos de liga na matriz. A análise da influência da concentração dos elementos de impureza na estrutura das ligas estudadas foi investigada através de um modelo de primeiros e segundos vizinhos. O valor do campo magnético hiperfino varia proporcionalmente ao número de vizinhos de impureza nos sítios de ferro. A distribuição de elementos de liga na matriz está diretamente relacionada à distribuição de campo magnético hiperfino. As probabilidades associadas aos valores de campo hiperfino permitiram uma melhor compreensão da estrutura das ligas.

La caracterización geológica del área de Amos Andrés, localizada en la Alta Cordillera, en el borde fronterizo de las regiones de Coquimbo y Valparaiso de Chile, y la Provincia de San Juan de Argentina, ha permitido distinguir la existencia de dos sistemas porfídicos de Cu-Mo (-Au): Amos y Andrés, los que se encuentran separados temporal y espacialmente por el Complejo de Diatrema Chilón. Las rocas que conforman el sistema porfídico Andrés son cortadas por las tobas brechosas del complejo de diatrema, mientras que estas últimas son intruidas por rocas porfídicas de Amos. En Andrés, dataciones U-Pb en circones indican para la intrusión intermineral más temprana reconocida hasta ahora en el área de estudio (Pórfido Diorítico Andrés), una edad de 7,7 ± 0,1 Ma para su emplazamiento; y para la intrusión tardío mineral (Pórfido Granodiorítico Andrés), una edad de 8,8 ± 0,1 Ma para su cristalización. En Amos, la cristalización del Pórfido Cuarzo Monzonítico Amos, pulso porfídico temprano mineral de este sistema, entregó una edad de 6,2 ± 0,4 Ma. La edad obtenida para el Pórfido Granodiorítico Andrés difiere del esquema geológico presentado, debido a que es más antigua que la edad de intrusiones porfídicas más tempranas. Sin embargo, este pórfido granodiorítico es sin duda tardío mineral ya que presenta efectos de alteración propilítica, ausencia de vetillas de cuarzo, xenolitos de rocas con alteración potásica y vetillas de cuarzo confinadas, y escasos contenidos de cobre respecto a las rocas que le rodean. Estas evidencias indican que debió haberse emplazado con posterioridad al Pórfido Diorítico Andrés, y previo a la formación del Complejo de Diatrema Chilón, es decir, alrededor de los 7 Ma. Por consiguiente, se sugiere que la edad obtenida representaría la presencia de circones heredados en el magma de esta intrusión, los que podrían derivar de los pórfidos dacíticos de la Unidad Tambillos, que afloran en los alrededores y que tienen edades similares a la obtenida para este pórfido. La mineralización de cobre, molibdeno y oro, se hospeda tanto en las intrusiones porfídicas tempranas e interminerales de ambos sistemas porfídicos, como en las rocas volcánicas de la Formación Los Pelambres-Juncal que los hospedan. Una edad 40Ar/39Ar de isocrona inversa en biotita secundaria de andesitas porfíricas del área de Andrés, con fuerte mineralización de calcopirita-magnetita, entregó una edad de 8,1 ± 0,1 Ma para el evento de alteración potásica. Esta edad, más antigua que la del Pórfido Diorítico Andrés, reflejaría un evento de alteración potásica relacionada a intrusiones porfídicas temprano-mineral aún no encontradas. De hecho, xenolitos subredondeados de rocas volcánicas con fuertes efectos de alteración potásica y vetillas de cuarzo tempranas truncadas en sus bordes, aparecen en los márgenes del Pórfido Diorítico Andrés, indicando, que estos efectos de alteración corresponden a eventos anteriores a su emplazamiento. Por consiguiente, se puede señalar que el sistema magmático-hidrotermal de Amos Andrés se habría desarrollado, al menos, entre los 8,2 y 5,8 Ma, es decir, durante el Mioceno Superior, siendo claramente más joven que otros centros porfídicos agrupados en clusters ubicados tanto al sur, “San Felipe”, como al norte, “Teatinos”, los que se formaron entre los 15 y 9 Ma. Es posible que las etapas inter a tardío mineral del Sistema Porfídico Andrés, así como las del Sistema Porfídico Amos, se hayan desarrollado en el marco de una tectónica regional fuertemente compresiva con altas tasas de alzamiento y denudación, lo que se refleja en las texturas porfídicas de alto contraste granulométrico indicando rápido enfriamiento epizonal, en el desarrollo de moderado telescoping con la sobreimposición progresiva de eventos de alteración y mineralización, y en la formación del Complejo de Diatrema Chilón. En el área de Amos Andrés, alrededor de los 32°S, esta tectónica compresiva, probablemente relacionada con la subducción de la Dorsal de Juan Fernández, se habría producido después de los 7,6 Ma y se habría propagado hacía el sur, para luego afectar, entre los 6 y 3 Ma, el desarrollo de los mega sistemas porfídicos de Río Blanco-Los Bronces y El Teniente.

CoordenaÃÃo de AperfeiÃoamento de Pessoal de NÃvel Superior / Este trabalho teve como objetivo avaliar as caracterÃsticas operacionais (geometria da solda e diluiÃÃo) e metalÃrgicas (microestrutura, composiÃÃo quÃmica, microdureza e resistÃncia à corrosÃo) de revestimentos compostos pela mistura das ligas de nÃquel Inconel 625 e Hastelloy C-276 depositadas simultaneamente pelo processo MIG/MAG duplo arame sobre chapas de aÃo ASTM 516 Gr 60. Inicialmente foi realizado um estudo preliminar para conhecer os parÃmetros iniciais de soldagem e os limites operacionais do processo. Em seguida, foram realizados ensaios em simples deposiÃÃo atravÃs da aplicaÃÃo do MÃtodo Taguchi com intuito de selecionar os melhores parÃmetros de cada fator de controle avaliado em um nÃmero reduzido de experimentos. Posteriormente, foram realizados revestimentos iniciais a partir dos parÃmetros selecionados. Em seguida foram realizados revestimentos definitivos nos quais foram feitas anÃlises das caracterÃsticas geomÃtricas e diluiÃÃo, alÃm de uma caracterizaÃÃo metalÃrgica com uso de microscopia Ãtica, microscopia eletrÃnica de varredura e anÃlise de composiÃÃo quÃmica. Ainda foram realizadas anÃlises do perfil de microdureza dos revestimentos, bem como anÃlise de resistÃncia à corrosÃo. Os resultados mostraram que os nÃveis de diluiÃÃo global mÃnimos alcanÃados nos ensaios definitivos foram de aproximadamente 22%. A microestrutura dos revestimentos soldados com a mistura das ligas Inconel 625 e Hastelloy C-276 foi constituÃda de uma maneira geral por uma matriz gama com precipitaÃÃo de fases secundÃrias ricas em niÃbio, molibdÃnio e titÃnio. A anÃlise de composiÃÃo quÃmica revelou que o percentual de Fe na solda à crescente com o aumento da diluiÃÃo. O aumento de Mo, W e reduÃÃo do Fe no metal de solda contribuiu para a formaÃÃo de fases secundÃrias. Em relaÃÃo à microdureza, nÃo houve diferenÃas significativas entre o primeiro e o Ãltimo cordÃo de solda e os valores obtidos foram adequados para revestimento. Jà para a resistÃncia à corrosÃo, algumas amostras atingiram temperatura crÃtica de pite (TCP) de 80ÂC e houve uma relaÃÃo entre os fatores de controle os principais elementos de liga presentes nos revestimentos. / The aim of this work was to evaluate the operational (weld geometry and dilution) and metallurgical characteristcs (microstructure, chemical composition, microhardness and corrosion resistance) of Inconel 625 and Hastelloy C-276 nickel-based alloys weld overlay deposited simultaneously by GMAW Double Wire process on steel plate ASTM 516 Gr 60. Initially a previous study was carried out in order to know the early welding parameters and the operational limits of process. Next, single passes welding trials was conducted by applying Taguchi method aiming to select the best parameters of each control factor studied in a reduced numbers of experiments. After, weld overlays were made based on selected parameters. Next, the definitive weld overlays were deposited on steel plates and thus were analysed the geometric features, dilution and metallurgical characterization using optical microscopy and scanning electron microscopy, also a chemical composition analysis was carried out. The profile of microhardness were also performed, as well as analysis of corrosion resistance. The results showed that the minimal global dilution levels measured on definitive weld overlays were 22% approximately. The microstructure of the weld overlays deposited by mixing Inconel 625 and Hastelloy C-276 was constituted generally by a gamma matrix and secondaries phases enriched in niobium, molybdenum and titanium. The chemical composition analysis revealed that the the percentage of Fe on weld increases when dilution levels rises. The increase in Mo, W and reduction in Fe content on the weld metal contributed to the formation of secondaries phases. Regarding the microhardness, no significative differences between first and last weld bead and the microhardness values obtained were appropriate for weld overlays. For corrosion resistance, some of the samples supported Critical Pitting Temperature (CPT) of 80 ÂC and there were a relation between the controled factors and principals alloy elements presents in the weld overlays.