by Yee-Lok Wong. / Thesis (Ph.D.)--Chinese University of Hong Kong, 1999. / Includes bibliographical references. / Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Mode of access: World Wide Web. / Abstracts in English and Chinese.

The interest in two-dimensional materials and materials physics has grown dramatically over the past decade. The family of two-dimensional materials, which includes graphene, transition metal dichalcogenides, phosphorene, hexagonal boron nitride, etc., can be fabricated into atomically thin films since the intralayer bonding arises from their strong covalent character, while the interlayer interaction is mediated by weak van der Waals forces. Among them, molybdenum disulfide (MoS₂) has attracted much interest for its potential applications in opto-electronic and valleytronics devices. Previously, much of the experimental studies have concentrated on optical and transport measurements while neglecting direct experimental determination of the electronic structure of MoS₂, which is crucial to the full understanding of its distinctive properties. In particular, like other atomically thin materials, the interactions with substrate impact the surface structure and morphology of MoS₂, and as a result, its structural and physical properties can be affected. In this dissertation, the electronic structure and surface structure of MoS₂ are directly investigated using angle-resolved photoemission spectroscopy and cathode lens microscopy. Local-probe angle-resolved photoemission spectroscopy measurements of monolayer, bilayer, trilayer, and bulk MoS₂ directly demonstrate the indirect-to-direct bandgap transition due to quantum confinement as the MoS₂ thickness is decreased from multilayer to monolayer. The evolution of the interlayer coupling in this transition is also investigated using density functional theory calculations. Also, the thickness-dependent surface roughness is characterized using selected-area low energy electron diffraction (LEED) and the surface structural relaxation is investigated using LEED I-V measurements combined with dynamical LEED calculations. Finally, bandgap engineering is demonstrated via tuning of the interlayer interactions in van der Waals interfaces by twisting the relative orientation in bilayer-MoS₂ and graphene-MoS₂-heterostructure systems.

MoS2, among many other transition metal dichalcogenides (TMDCs), holds great promise for future applications in nano-electronics, opto-electronics and mechanical devices due to its ultra-thin nature, flexibility, sizable band-gap, and unique spin-valley coupled physics. However, there are two main challenges that hinder careful study of this material. Firstly, it is hard to achieve Ohmic contacts to mono-layer MoS2, particularly at low temperatures (T) and low carrier densities. Secondly, materials' low quality and impurities introduced during the fabrication significantly limit the electron mobility of mono- and few-layer MoS2 to be substantially below theoretically predicted limits, which has hampered efforts to observe its novel quantum transport behaviours. Traditional low work function metals doesn't necessary provide good electron injection to thin MoS2 due to metal oxidation, Fermi level pinning, etc. To address the first challenge, we tried multiple contact schemes and found that mono-layer hexagonal boron nitride (h-BN) and cobalt (Co) provide robust Ohmic contact. The mono-layer spacer serves two advantageous purposes: it strongly interacts with the transition metal, reducing its work function by over 1 eV; and breaks the metal-TMDCs interaction to eliminate the interfacial states that cause Fermi level pinning. We measure a flat-band Schottky barrier of 16 meV, which makes thin tunnel barriers upon doping the channels, and thus achieve low-T contact resistance of 3 kohm.um at a carrier density of 5.3x10^12/cm^2. Similar to graphene, eliminating all potential sources of disorder and scattering is the key to achieving high performance in MoS2 devices. We developed a van der Waals heterostructure device platform where MoS2 layers are fully encapsulated within h-BN and electrically contacted in a multi-terminal geometry using gate-tunable graphene electrodes. The h-BN-encapsulation provides excellent protection from environmental factors, resulting in highly stable device performance, even at elevated temperatures. Both optical and electrical characterization confirms our high quality devices, including an ultra-clean interface, a record-high Hall mobility reaching 34,000 cm^2/Vs, and first observation of Shubnikov–de Haas oscillations. The development of Ohmic contact and fabrication of high quality devices are critical to MoS2 application and studying its intrinsic properties. Therefore, the progress made in this work will facilitate efforts to study novel physical phenomena of MoS2 that were not accessible before.

In this study an initial assessment of the composition – microstructure – property relationships in binary and ternary Ti – based systems are made possible using LENSTM technology. Laser Engineering Net Shaping (LENSTM), a rapid prototyping, directed laser deposition methodology of additive manufacturing (AM) was used to create bulk homogenous specimens that are compositionally graded. Compositionally graded specimens were made possible by incorporating elemental blends of powder during the LENSTM process. While there have been numerous studies assessing the influence of common elements (e.g., V, Mo, Al, and Cr) on the resulting microstructure in titanium alloys, other elements have been neglected. A systematic study of the Ti – Fe – Al ternary system based upon varying compositions of the eutectoid former, Fe with Al to stabilize the a and b phases respectively has also been neglected. This research effort focuses on exploiting the LENSTM process by rapidly assessing the composition – microstructure – property relationships in a combinatorial approach for the Ti – W, Ti – Fe, and Ti – Fe – Al systems. Compositionally graded specimens of Ti – xW (0<x<40wt.%(14.79at.%)), Ti – xFe (0<x<35wt.%(36.37at.%)), and Ti – xFe – yAl (0<x<40wt.%(36.37at.%)), y=5,10, 15wt.%) have been heat treated to also assess the influence of thermal history on microstructural features such as phase composition and volume fraction. Lastly, a Ti – xMo (0<x<40wt.%(24.96at.%)) compositionally graded specimen was deposited to re-assess the Mo-equivalency nature of W, as well as assess the role of phase separation in microstructural evolution at temperatures above and below the invariant point (~695°C) of the Ti – W binary system.

Made available in DSpace on 2014-06-11T19:22:15Z (GMT). No. of bitstreams: 0 Previous issue date: 2011-07-27Bitstream added on 2014-06-13T19:48:25Z : No. of bitstreams: 1 ferrarineto_j_me_botfca.pdf: 394206 bytes, checksum: 6b64f3f5824ba5c1c97d98a5556b8a6a (MD5) / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) / Áreas que vem sendo cultivadas com pastagens por vários anos podem apresentar deficiências nutricionais e a população de bactérias fixadoras do nitrogênio atmosférico pode estar reduzida. O molibdênio é um micronutriente que faz parte da enzima nitrogenase, a qual é responsável pela fixação simbiótica do nitrogênio nas leguminosas, e está presente nos bacteróides nodulares. Com base nisso, o presente trabalho teve por objetivo avaliar o efeito da aplicação de molibdênio e inoculante, na cultura do amendoim em semeadura direta sobre palhada de forrageiras. Foram conduzidos quatro experimentos, dois no ano agrícola 2008/09 e dois no ano agícola 2009/10, onde a cultura do amendoim foi semeada, respectivamente, sobre as palhadas da Brachiaria brizantha, Brachiaria ruziziensis, Brachiaria brizantha e Brachiaria decumbens no delineamento de blocos casualizados, em esquema de parcelas subdivididas, com quatro repetições. As parcelas dos experimentos foram constituídas por dois tratamentos, com e sem aplicação de inoculante (1- inoculação artificial com estirpe específica de bactéria Bradyrhizobium spp. para a cultura do amendoim e 2- sem inoculação artificial) e as subparcelas dos experimentos do ano agrícola 2008/09 por três doses de molibdênio (27,5, 55, 110g ha-1) aplicadas via tratamento de sementes, na forma de molibdato de amônio e a testemunha. As subparcelas dos experimentos do ano agrícola 2009/10 constituíram-se de três doses de molibdênio (50, 100, 200g ha-1) aplicadas via foliar, na forma de molibdato de amônio e a testemunha. Foram avaliados o estado nutricional das plantas, a nodulação (número e matéria seca de nódulos por planta), a atividade da enzima nitrogenase pelo método da redução do acetileno, a atividade específica da nitrogenase, os componentes da produção... / The areas that have been cultivated with pasture for several years may have nutritional deficiencies and the population of atmospheric nitrogen fixing bacteria may be reduced. Molybdenum, a nutrient that is part of the nitrogenase enzyme, is responsible for symbiotic nitrogen fixation in legumes and is present in bacteria from the nodules. This study aimed at evaluating the effect of molybdenum and inoculant application, in peanut crop sown on a straw of forages. Four experiments were carried out, two in 2008/09 crop year and two in 2009/10 crop year, where peanut crop was directly sown, respectively, on the straws of Brachiaria brizantha, Brachiaria ruziziensis, Brachiaria brizantha and Brachiaria decumbens in the design of randomized blocks in a split-plot with four replications. The plots comprised two treatments, with and without inoculant application (1 - artificial inoculation with specific strain of Bradyrhizobium spp. for peanut crop and 2 - without artificial inoculation) and the subplots of the experiments carried out in the 2008/09 crop year in three molybdenum rates (27,5, 55 e 110 g ha-1) applied in the form of ammonium molybdate by seeds treatment and a control. The subplots of the experiments carried out in the 2009/10 crop year comprised three molybdenum rates (50, 100 e 200 g ha-1) applied as ammonium molybdate by foliar spraying and a control. The nutritional status of plants, nodulation (number and mass of dry matter of the nodules per plant), the activity of nitrogenase enzyme by acetylene reduction method, the specific activity of nitrogenase, yield components and the yield of pods and grains were evaluated. The data of each experiment were subjected to analysis of variance following the split plot model. To compare the average of inoculation, the method of comparison of unprotected average... (Complete abstract click electronic access below)

Made available in DSpace on 2014-06-11T19:22:16Z (GMT). No. of bitstreams: 0 Previous issue date: 2010-06-05Bitstream added on 2014-06-13T19:27:22Z : No. of bitstreams: 1 sanches_ma_me_botfca.pdf: 460550 bytes, checksum: fe3b4cb9a9c2d9fca60c1131f495770c (MD5) / Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) / A nutri o mineral do feijoeiro com macro e micronutrientes fundamental para a sobreviv ncia, desenvolvimento afetando diretamente a produtividade. Os micronutrientes por sua vez s o essenciais em pequenas quantidades, sendo sua corre o complexa, para que os n veis necess rios s plantas sejam atendidos. Dentre esses micronutrientes, o Zn um nutriente escasso em solos brasileiros, bem como o Mo que possui vital import ncia, pois melhora o aproveitamento de N2 pelas bact rias do g nero Rhizobium, as quais promovem simbiose com as plantas. Estes micronutrientes foram estudados pelo fato de ambos poderem contribuir para o incremento da produtividade do feijoeiro. Devido a esse fato, para que se consiga aumentar a produtividade, em alguns casos, necess ria uma aduba o complementar. Apesar de existirem v rios m todos de fertiliza o, devido a particularidades, eles nem sempre se mostram eficientes. Com isso, o objetivo do presente estudo foi avaliar os componentes de produ o, teor e acumula o de nutrientes nos gr os do feijoeiro Cultivar IAC – Alvorada, em dois tipos de solo, sob diferentes formas de aplica o l quida desses micronutrientes (Zn e Mo). Os experimentos foram conduzidos em t nel pl stico, no Departamento de Recursos Naturais/Ci ncia do Solo da FCA/UNESP Campus de Botucatu/SP. Os solos utilizados foram Latossolo Vermelho Escuro distr fico textura m dia (Led) e Latossolo Roxo distr fico textura argilosa (LR). Os vasos utilizados no experimento foram de 15 dm3 de terra seca ao ar passada em peneira de 4 mm. Os tratamentos foram compostos quanto forma de aplica o sendo: pulverizado junto semente, pulverizado junto ao adubo NPK na semeadura e pulverizado na superfície do solo. E quanto à adição de Zn e Mo foram: com Mo, com Zn e com Mo + Zn (juntos); foram também utilizadas três testemunhas: duas relativas, sendo a primeira... / The mineral nutrition of beans with macro and micronutrients is indispensable to survival, development and affects directly productivity. Micronutrients in turn are needed in small quantities, being difficult its correction, to the levels required by plants are supplied. Amongst theses micronutrients, Zn is a sparse nutrient in Brazilian soils, on the other hand Mo has a vital importance, because improve the utilization of N2 by bacteria of genus Rhizobium, which promote symbiosis with plants. Theses micronutrients were studied because both can affect to increase common beans productivity. Because of this, to improve productivity is almost always required an additional fertilizer. Although there are a lot of fertilization methods, for some particularities, they do not always demonstrate efficient. For that reason, the purpose of this study was to evaluate production components, content and nutrients accumulation in the grain of common beans cv “IAC – Alvorada”, in two kinds of soil, into different methods of liquid application of theses micronutrients (Zn and Mo). The research was carried out in a greenhouse of Natural Resources Department/Soil Sciences, FCA/UNESP, Botucatu/SP, the used soils were Red Latosol medium texture and a Red Latosol clayey texture. The pots used on that research were 15dm3 of dry land to air passed through sieve of 4 mm. The treatments were consisted of application methods: sprayed on seeds, sprayed on fertilizer NPK at sowing and sprayed on the soil surface. And consisted of Zn and Mo addition were: with Mo, Zn and Mo + Zn (together); three more controls: two relatives controls with Zn mixed with NPK and leaf fertilization with Mo and one more called absolute control, without Zn and Mo addition. It consisted of twelve treatments with four replications; the experimental design was completely randomized blocks. It was concluded that methods of micronutrient... (Complete abstract click electronic access below)

Orientadora: Profa. Dra. Paula Homem de Mello / Dissertação (mestrado) - Universidade Federal do ABC, Programa de Pós-Graduação em Ciência & Tecnologia - Química, 2014. / Métodos computacionais foram empregados para avaliar os efeitos da substituição de átomos de molibdênio por cobalto, ou níquel, em catalisadores de sulfeto de molibdênio, utilizados nos processos de hidrodessulfurização. O estudo foi feito utilizando duas diferentes abordagens. O método de Monte Carlo para determinar as estrutura mais prováveis envolvidas no processo de adsorção de tiofeno e sulfeto de dimetila, enquanto métodos baseados na teoria do funcional da densidade foram utilizados para otimizar as estruturas obtidas por Monte Carlo e determinar as energias de adsorção. A validação dos clusters utilizados foi feita pela avaliação das distâncias das ligações entre os átomos, principalmente dos átomos localizados nas bordas e encontrado como cluster mínimo a ser utilizado nas simulações o Mo16S32. Foi, em seguida, estudada a adsorção de tiofeno, e a possibilidade de transferência de carga foi avaliada a partir das cargas atômicas, juntamente com os orbitais HOMO-LUMO. Essas propriedades permitiram mostrar que a substituição de átomos de molibdênio por átomos de cobalto, resultam em maior transferência de carga do adsorbato ocorrendo ampliação dos sítios ácidos. / Computational methods were used to evaluate the effect of substitution of atoms of molybdenum by cobalt or nickel in the molybdenum sulfide catalyst used in hydrodesulfurization process. The study was conducted using two different approaches. Monte Carlo method was employed to determine the most probable structures involved in the thiophene and dimethyl sulfide adsorption process. Density functional theory-based methods were used to optimize the structures obtained by Monte Carlo and determine the adsorption energies. Validation of clusters employed in this study was performed by evaluating the bond distances between atoms, particularly atoms from the edges. The results presented herein demonstrate that Mo16S32 cluster can be used to represent the catalyst. Atomic charges analysis and frontier molecular orbitals were employed to evaluate the acidity of the different sites. These properties showed also that the replacement of molibidenium atoms by cobalt atoms results in increasing charge transfer and promotes new acidic sites.

Orientador: Dirceu Maximino Fernandes / Banca: Hélio Grassi Filho / Banca: Edison Ulisses Ramos Junior / Resumo: A nutri„…o mineral do feijoeiro com macro e micronutrientes  fundamental para a sobreviv‡ncia, desenvolvimento afetando diretamente a produtividade. Os micronutrientes por sua vez s…o essenciais em pequenas quantidades, sendo sua corre„…o complexa, para que os nŠveis necessŒrios †s plantas sejam atendidos. Dentre esses micronutrientes, o Zn  um nutriente escasso em solos brasileiros, bem como o Mo que possui vital import“ncia, pois melhora o aproveitamento de N2 pelas bactrias do g‡nero Rhizobium, as quais promovem simbiose com as plantas. Estes micronutrientes foram estudados pelo fato de ambos poderem contribuir para o incremento da produtividade do feijoeiro. Devido a esse fato, para que se consiga aumentar a produtividade, em alguns casos,  necessŒria uma aduba„…o complementar. Apesar de existirem vŒrios mtodos de fertiliza„…o, devido a particularidades, eles nem sempre se mostram eficientes. Com isso, o objetivo do presente estudo foi avaliar os componentes de produ„…o, teor e acumula„…o de nutrientes nos gr…os do feijoeiro Cultivar IAC - Alvorada, em dois tipos de solo, sob diferentes formas de aplica„…o lŠquida desses micronutrientes (Zn e Mo). Os experimentos foram conduzidos em t‘nel plŒstico, no Departamento de Recursos Naturais/Ci‡ncia do Solo da FCA/UNESP Campus de Botucatu/SP. Os solos utilizados foram Latossolo Vermelho Escuro distrfico textura mdia (Led) e Latossolo Roxo distrfico textura argilosa (LR). Os vasos utilizados no experimento foram de 15 dm3 de terra seca ao ar passada em peneira de 4 mm. Os tratamentos foram compostos quanto † forma de aplica„…o sendo: pulverizado junto † semente, pulverizado junto ao adubo NPK na semeadura e pulverizado na superfície do solo. E quanto à adição de Zn e Mo foram: com Mo, com Zn e com Mo + Zn (juntos); foram também utilizadas três testemunhas: duas relativas, sendo a primeira... (resumo completo, clicar acesso eletrônico abaixo) / Abstract: The mineral nutrition of beans with macro and micronutrients is indispensable to survival, development and affects directly productivity. Micronutrients in turn are needed in small quantities, being difficult its correction, to the levels required by plants are supplied. Amongst theses micronutrients, Zn is a sparse nutrient in Brazilian soils, on the other hand Mo has a vital importance, because improve the utilization of N2 by bacteria of genus Rhizobium, which promote symbiosis with plants. Theses micronutrients were studied because both can affect to increase common beans productivity. Because of this, to improve productivity is almost always required an additional fertilizer. Although there are a lot of fertilization methods, for some particularities, they do not always demonstrate efficient. For that reason, the purpose of this study was to evaluate production components, content and nutrients accumulation in the grain of common beans cv "IAC - Alvorada", in two kinds of soil, into different methods of liquid application of theses micronutrients (Zn and Mo). The research was carried out in a greenhouse of Natural Resources Department/Soil Sciences, FCA/UNESP, Botucatu/SP, the used soils were Red Latosol medium texture and a Red Latosol clayey texture. The pots used on that research were 15dm3 of dry land to air passed through sieve of 4 mm. The treatments were consisted of application methods: sprayed on seeds, sprayed on fertilizer NPK at sowing and sprayed on the soil surface. And consisted of Zn and Mo addition were: with Mo, Zn and Mo + Zn (together); three more controls: two relatives controls with Zn mixed with NPK and leaf fertilization with Mo and one more called absolute control, without Zn and Mo addition. It consisted of twelve treatments with four replications; the experimental design was completely randomized blocks. It was concluded that methods of micronutrient... (Complete abstract click electronic access below) / Mestre

Este trabalho consiste na síntese e na caracterização de complexos inéditos de gálio, índio, cobalto, cobre e molibdênio.Baseando-se na potencial aplicação na terapia dos complexos de gálio e índio, dois novos complexos, um de gálio e um de índio, foram sintetizados utilizando como ligante o ânion monovalente da 2,3-dihidroxipiridina e um de gálio foi sintetizado utilizando como ligante o mono ânion da 2-hidroxipiridina-N-óxido. Um ligante macrocíclico derivado do cyclam foi sintetizado. Posteriormente, foi preparado um complexo de cobre e um de cobalto com o macrociclo, visando a potencial aplicação de complexos desse tipo na medicina nuclear. Cinco complexos de molibdênio foram sintetizados, sendo dois utilizando ligantes hidrazonas e três com ligantes ditiocarbazatos, visando sua potencial aplicação na terapia da doença de Chagas. Os compostos foram caracterizados por espectroscopia de absorção na região do infravermelho, análise elementar (C, H, N e S), espectroscopia de ressonância magnética nuclear (1H e no caso do ligante macrociclo 13C), espectrometria de massas (MS-ESI) e difração de raios X.Após completa caracterização, os complexos de gálio e índio tiveram sua atividade antitumoral in vitro avaliada em linhagens de células derivadas de tumores e, como estudo pioneiro, os complexos também tiveram sua atividade tripanocida avaliada, assim como os complexos de molibdênio. / This work consists on the synthesis and characterization of novel complexes of gallium, indium, cobalt, copper and molybdenum.Based on the potential therapeutic application of gallium and indium complexes, two new complexes with the monovalent anion of 2,3-dihydroxypyridine were synthesized, one of gallium and one of indium. In addition, one gallium complex was prepared with the mono anion of 2-hydroxypyridine N-oxide as ligand. A cyclam derivative macrocycle ligand was synthesized. Subsequently, a copper and a cobalt complex were synthesized with the new macrocycle, aiming their potential application in nuclear medicine. Five molybdenum complexes were synthesized, two with hydrazones and three with dithiocarbazates as ligands, focusing their potential application in Chagas disease therapy. The compounds were characterized by infrared absorption spectroscopy, elemental analysis (C, H, N and O), nuclear magnetic resonance (1H and, in the case of the macrocycle ligand, 13C), mass spectrometry (ESI-MS), and single crystal X-ray diffraction. After complete characterization, the complexes of gallium and indium had their in vitro antitumor activity assessed front tumor-derived cell lines and as a first study the complexes were also evaluated regarding their trypanocidal activity, as well as the molybdenum complexes.

O Tecnécio-99m (99mTc), gerado a partir do decaimento do Molibdênio-99 (99Mo), é o radionuclídeo mais conveniente para a execução de procedimentos de diagnósticos médicos, devido à sua emissão gama bem característica e de fácil detecção. O método utilizado para produzir 99Mo é através da fissão do 235U incorporado nos chamados alvos de irradiação. Duas rotas estão sendo desenvolvidas para a produção do 99Mo por fissão para o Reator Multipropósito Brasileiro (RMB), ambas utilizando urânio de baixo enriquecimento (LEU): 1) A primeira a dissolução básica, que é baseada na tecnologia de alvos de dispersão UAlx-Al. 2) A segunda emprega a dissolução ácida de alvos de folhas finas de urânio metálico. A principal vantagem dos alvos de folha fina de urânio metálico sobre os alvos de dispersão UAlx-Al é a alta densidade do urânio metálico. Com o intuito de compreender e otimizar o processo de fabricação de alvos de folhas finas foi realizado um estudo da fusão do urânio metálico, laminação de folhas finas, caracterização microestrutural e montagem dos alvos, definindo assim, os procedimentos específicos para a produção desse tipo de alvo com as características dos alvos fabricados internacionalmente. Os resultados obtidos mostraram que o processo de fabricação dos lingotes e de lâminas de urânio metálico por meio de laminação a quente possibilitaram a obtenção de lâminas com espessura entre 250 e 300 &mu;m. O processo de laminação a frio possibilitou a obtenção de folhas finas com espessura de &plusmn;125 &mu;m que atende à especificação internacional. O uso de óxido de alumínio como material para prevenir caldeamento do tablete de urânio mostrou-se eficiente, substituindo com vantagens o uso de óxido de ítrio. A microestrutura após o tratamento térmico apresentou grãos equiaxiais pequenos, e a realização de um resfriamento rápido de 5 minutos após o tratamento térmico foi suficiente para se eliminar a textura da folha fina de urânio metálico. O processo de montagem das folhas finas no alvo tubular foi realizado por pré-conformação da folha fina, facilitando a montagem. O processo de consolidação do alvo foi realizado por expansão por tração e a folga após a consolidação (\"gap de ar\") mostrou-satisfatória. As dimensões finais dos alvos tubulares atenderam à especificação internacional. / Technetium-99m (99mTc) is generated from the decay of Molybdenum-99 (99Mo). This element is the most convenient radionuclide for application in medical diagnostic procedures, once that its gamma emission is well known and of easily detected. The method used to produce 99Mo is through fission of the 235U embedded in so-called irradiation targets. Two routes are being developed for the production of 99Mo per fission to the Brazilian Multipurpose Reactor (RMB), both using low enriched uranium (LEU): 1) The first basic dissolution, which is based on the technology of dispersion targets UAlx-Al. 2) The second employs the acidic dissolution of thin sheet targets of metallic uranium. The main advantage of uranium metal foil targets on the UAlx-Al dispersion targets is the high density of metallic uranium. In order to understand and optimize the process of manufacturing thin sheet targets, about the fusion of metallic uranium, thin sheet lamination, microstructural characterization and assembly of the target was carried out. Therefore the specific procedures for the production of this type of target with the characteristics of the targets manufactured internationally could be defined. The results showed that the process of manufacturing ingots and sheets of metallic uranium by hot rolling allows obtaining sheets with thickness between 250 and 300 &mu;m. The cold rolling process allows obtaining thin sheets with a thickness of &plusmn; 125 &mu;m which are in accordance with the international specification. The use of aluminum oxide as a material to prevent uranium tablet firing proved to be efficient, replacing with advantage the use of yttrium oxide. The microstructure after the heat treatment showed small equiaxial grains. A fast cooling of 5 minutes after the heat treatment was enough to eliminate the texture of the thin sheet of metallic uranium. The process of assembling the thin sheets in the tubular target was performed by preforming the thin sheet, facilitating the assembly. The process of consolidating the target was performed by tensile expansion and the clearance after consolidation (\"air gap\") was satisfactory. The final dimensions of the tubular targets have met the international specification.