Materials Literature
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The power density of a gearbox is an important consideration for many applications and is especially important for gearboxes used on aircraft. One approach to improving power density of gearing is to improve the steel properties by design of the alloy. The alloy tested in this work was designed to be case-carburized w…
With the mass production of fullerenes currently underway, and the mass production of carbon nanotubes soon to follow, only a few studies have examined the biological consequences of manmade nanoparticle exposure in the mammalian system. This study examines carbon nanoparticle (CNP) exposure in both in vitro (murine B…
The double layer capacitance of an activated carbon nanofiber (ACNF) with a 100∼200 nm fiber-diameter, prepared by the polymer blend spinning technique, was investigated using 1-ethyl-3-methylimidazolium tetrafluoroborate (EMImBF4) as the electrolyte. The conventional activated carbon fiber (ACF) with the fiber-diamet…
When microwave emitted from a point source is focused on a target by using a left-handed metamaterial (LHM) flat lens, microwave backscattered from the target will be refocused by the LHM lens in the vicinity of the point source. Numerical simulations with two-dimensional (2D) finite-difference time-domain (FDTD) meth…
In this work, we report a method of preparing porous metal oxide macrobeads using a cation-exchange resin with sulfonic acid groups as templates and aqueous solutions of metal salts as precursors. The metal–resin complexes formed on the pore surface of resins were firstly transformed into metal hydroxide precipitates…
Reduced activation ferritic/martensitic steels (RAFs) are recognized as the primary candidate structural materials for fusion blanket systems. F82H is the RAF which has been developed and studied in Japan, and F82H-IEA heat, one of the world’s first 5 ton heats of RAF, was provided and evaluated in various countries a…
In Mg alloys, twins have been known to be an important deformation mechanism. However, their roles on deformation mechanisms have not been well understood. In this work, we performed tensile test of rolled sheets of AZ31 Mg alloys at room temperature. A number of large surface reliefs were observed in a region near a…
The magnetite nanoparticles were synthesized through a process including dissolution of Fe(OH)2 and precipitation of an oxidized phase under ultrasonic irradiation in an aqueous solution. It was found that the ultrasonic irradiation accelerated the formation of magnetite. The crystallinity and magnetic properties of t…
Submitted by Marcio Luis Ferreira Nascimento (mlfn@ufba.br) on 2010-11-10T19:51:40Z No. of bitstreams: 1 DiffusionProcessesVitreousSilica-PCG48-Nascimento.pdf: 666742 bytes, checksum: 343c85ff48b00fb7276bce3077246e52 (MD5)
An all‐solid‐state electrochromic device (ECD) was designed for electronic variable emissivity (VE) control. In this paper, a low weight (5g/m2) electrochromic thermal control device, the EclipseVEECD™, is detailed as a viable thermal control system for spacecraft outer surface temperatures. Discussion includes the te…
Within the family of nanomaterials, carbon nanotubes (CNTs) have emerged as a new efficient scaffold for studying molecular interactions at interfaces. Poor dispersability of CNTs in any solvent presents a considerable drawback for the development of novel functional composite structures. Previous studies have demonst…
Solution annealed austenitic stainless steels, essentially of type AISI 304(L) and AISI 316(L), were originally considered not susceptible to cracking by SCC in the reducing environment of PWRs primary water. However, Constant Extension Rate Tests (CERTs), performed on heavily cold worked austenitic stainless steels s…
Preface Metallurgical Factors affecting Localised Corrosion of Low-C 13CrNiMo Martensitic Stainless Steels Copper Distributions in Al-Alloys Corrosion of Silver in Aqueous Chloride Solutions and Applications to the Corrosion of Ancient Silver Coins An Electrochemical Investigation of the Corrosion Behaviour of Titaniu…
The synthesis of new benzothiazole push-pull systems as candidates for NLO-phores is described. Spectral (UV/VIS and solvatochromic) and theoretical studies (electronic properties based on semiempirical AM1 and PM3 methods) of the prepared compounds were carried out. The structure and physico-chemical parameters affec…
Amyloid-like model peptides, modified on the N-terminus with an alkyl tail and on the C-terminus with a PEG chain, yielded fibres that were susceptible to triggered disassembly by removal of the alkyl chain, which affected the hydrophobic-hydrophilic balance.
Zinc runoff rates from 11 zinc-based construction materials with and without surface treatments or coatings are presented and discussed in terms of patina formation, seawater deposition, wetting conditions, and changes in corrosion resistance. As opposed to earlier reports, current runoff rates have been assessed in a…
The addition of heteroaromatic lithium reagents 2 to a THF solution of perfluorocyclopentene (1) provided preferentially the corresponding monosubstituted products 5, while the addition of 1 to 2 effectively gave the 1,2-disubstituted products 6 in good to excellent yields. The reaction of 1 with sodiomalonate 3 or ph…
Wet-chemical techniques for the synthesis of complex oxide materials have advanced significantly; however, achieving finely dispersed nanoparticles with sizes less than 10 nm still remains challenging, especially for the perovskite family of compounds. On the other hand, a fungus-mediated synthesis technique has recen…
Phase segregation between polymer and gelling silica has been utilized to introduce a controlled second level of porosity into mesoporous silica particles produced by evaporation-induced self-assembly (EISA) in aerosol droplets. During EISA within droplets, solvent evaporation leads to surfactant self-assembly, which…
Chemical modification of the trinuclear [Mo3(μ3-S)(μ2-S2)3Br6]2− cluster, at either the outer bromine or the disulfide ligands, allows the facile preparation of the dianions [Mo3(μ3-S)(μ2-S2)3(tdas)3]2− ([1]2−) (tdas = 1,2,5-thiadiazole-3,4-dithiol), [Mo3(μ3-S)(μ2-SSe)3Br6]2− ([2]2−) and [Mo3(μ3-S)(μ2-S2)3Cl6]2− ([3]2…