Materials Literature
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Este estudo avaliou o efeito do jateamento de Al2O3 na resistência de união de uma liga de ouro e uma de cobalto-cromo a uma cerâmica, após serem submetidos ao ensaio de flexão de três pontos (ISO 9693). As hipóteses foram que o tipo de liga produza valores de resistência de união semelhantes e o jateamento de Al2O3 m…
Geckos are remarkable little creatures, clinging to almost any dry surface, and Alyssa Stark, from the University of Akron, USA, explains that they appear to be equally happy scampering through tropical rainforest canopies as they are in urban settings. ‘A lot of work is done on geckos that looks at the very small adh…
Este estudo teve o propósito de investigar a correlação entre as propriedades microdureza superficial e resistência à compressão de compósitos indiretos. Confeccionaram-se 25 cilindros de 5 marcas comerciais de compósitos (n=5) de dimensões 13 X 4 mm. Signum (Heraeus Kulzer), Solidex (Shofu Inc.), Resilab (Wilcos), Ad…
Abstract The aim of this study was to develop Au-Pt-Pd-Si alloys with metal-resin bonding properties optimized for dental restorations. The amount of silicon added ranged from 0.00-0.54 wt.%. The Au-Pt-Pd-Si alloys were manufactured using an arc melting furnace. They were homogenized at 800°C in air and cold rolled to…
Large-area GaN -based blue light-emitting diodes (LEDs) on sapphire substrates with an omnidirectional nanostructure consisted of Ag nanoparticles and TiO2/SiO2 Bragg reflector were fabricated. For the LEDs without the omnidirectional nanostructure, the spectra of the P- and S-polarization light are lightly different…
(Y 2 O 3 + TiC)/Ti-4.5Si composites have been in-situ synthesized using arc-melting technology. Y 2 O 3 and TiC particles grow in near-equiaxed and dendritic shapes, which are distributed uniformly in Ti-4.5Si matrix including the network Ti + Ti 5 Si 3 eutectic cells. From hardness and compressive tests at room tempe…
Abstract The properties of barium hafnate titanate are possibly better than those of barium zirconium titanate. In general nanoscale materials possess unique electrical, magnetic, and optical properties. Barium hafnate titanate powders were prepared via sol-gel processing at different sol concentrations. X-ray diffrac…
\n O emprego das estruturas de membrana é cada dia mais frequente em edificações de relevância civil e arquitetônica, em especial para a cobertura de grandes vãos. Sua aplicabilidade, contudo, vai além da construção civil, sendo igualmente importante nas indústrias das engenharias mecânica, naval, oceânica, aeroespaci…
The density functional theory (DFT) has been used to solve the SchrÄodinger equation. The computer programmes have been developed which give a real advantage for solving large matrices in DFT that seem impossible to write by hand. The Amsterdam density functional (ADF) and DMol3 of Accelerys have been used to calculat…
The low -\\beta magnet systems are located in the LHC insertion regions around the four interaction points. They are the key elements in the beams focusing/defocusing process and will allow proton collisions at a luminosity of up to 10**34/cm**2s. Large radiation dose deposited at the proximity of the beam collisions…
Abstract The high temperature stability of γ-Al2O3 films deposited using filtered cathodic arc and plasma assisted chemical vapor deposition on Ti0.33Al0.67N coated WC–Co cutting inserts is investigated. X-ray diffractometry reveals that filtered cathodic arc deposited films transform partially into the thermodynamica…
We have examined theoretically the electronic band structure and Fermi surface of tetragonal low-temperature superconductor Bi2Pd. Our main results are that (i) the Pd 4d and Bi 6p states determine the main peculiarities of the multiple-sheets FS topology, thus for this material the complicated superconducting gap str…
Abstract : Ceramics and semiconductors are an integral part of today s energy devices. This research addresses conductive heat transfer issues in such materials using a combination of classical and quantum mechanical atomistic simulations. For any kind of thermal system, thermal stress and thermal conduction cannot be…
This chapter contains sections titled: Introduction Foldamers: the Background Molecular Recognition Homoduplex Organogels Vesicles Supramolecular Liquid Crystals Macrocycles Catalysis Macromolecular Self-Assembly Conclusion and Perspectives Acknowledgments References Comment 1 Comment 2 Introduction Macrocyclic Compou…
We investigated the in-plane resistivity anisotropy for underdoped Ba(Fe$_{1-x}$Co$_x$)$_2$As$_2$ single crystals with improved quality. We demonstrate that the anisotropy in resistivity in the magnetostructural ordered phase arises from the anisotropy in the residual component which increases in proportion to the Co…
This chapter contains sections titled: Nanoparticles Particles and the environment Nanoparticles in soil Nanoparticles in water Nanoparticles in air Nanoparticles in medicine Nanotoxicology Nanotoxicology in humans and experimental animals Complications with nanotoxicological studies Molecular mechanisms of nanopartic…
DC745U is a silicone elastomer used in several weapon systems. DC745U is manufactured by Dow Corning and its formulation is proprietary. Risk changes without notification to the customer. {sup 1}H and {sup 29}Si{l_brace}{sup 1}H{r_brace} NMR have previously determined that DC745U contains {approx} 98.5% dimethyl silox…
The rigorous approach to the description of the kinetic evolution of a many-particle system composed of a trace hard sphere and an environment of finitely many hard spheres is developed. We prove that the evolution of states of a trace hard sphere in an environment can be described within the framework of the marginal…
In this paper, the dipole-induced band offset described in Fig. The proper figure is presented here with the band offset describing an increase in the effective work function drawn at the appropriate direction. This correction does not affect any other parts of the paper. (b) D FIG. 4. (Color online) (b) Schematic ban…
This chapter contains sections titled: Diffusion Coefficient Dissolution and Particle Growth Nucleation References