Materials Literature
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In this paper, the properties of carbide ceramics (SiC, and B 4 C) from aqueous gelcasting and pressure-less sintering were studied systematically. The optimized sintering process was achieved via a series of experiments with effective control of grain size and microstructure for developing high performance ceramics.…
Ultra-high performance concrete (UHPC) is a new generation of concrete developed through microstructure enhancement techniques for cementitious materials. UHPC exhibits extremely high compressive and flexural strengths exceeding 180 and 30 MPa, respectively, and remarkable durability compared to normal concretes. The…
This study aimed to evaluate borate:amine:copper derivatives in wood for fungal decay protection as well as the permanence of copper and boron in wood. Each of four derivatives of borate: amine:copper prevented fungal decay in wood. Disodium tetraborate decahydrate (borax):amine:copper derivatives with 0.61-0.63% rete…
The application of a multistage drug-delivery system comprising biodegradable nanoporous silicon particles that allow for a site-specific delivery of different imaging or therapeutic nanoparticles is presented by Mauro Ferrari and co-workers on page H278. The image shows a silicon particle that releases a therapeutic…
Ethnopharmacological \nevidence supporting the inhibitory effect of appetite and weight loss Hoodia gordonii (Apocynaceae) native to Africa and \nsold worldwide for the treatment of obesity. However, such effects have been demonstrated only by its active ingredient, the \nglycoside P57. There are no studies related to…
Field effect transistor with TiO 2 nanotube channel was fabricated by dielectrophoresis. Although TiO 2 nanotube channel is not formed at 10 MHz of the dielectrophoresis, the channel is formed at 100 kHz. It is suggested that migration distance is not enough at 10MHz. The drain current-drain voltage characteristics of…
Periodic tent-like post patterns on a-plane sapphire substrates were fabricated using a two-step etching process. They were denoted as a-plane dot pattern sapphire substrate (ADPSS). Compared with the GaN-based light-emitting diode (LED) grown on a-plane sapphire without any pattern (AFlat), the ADPSS-LED has higher o…
Abstract Experimental evidence of regularly coiled carbon nanotubes have been reported in 1994. They are predicted to have excellent electro‐magnetic properties, although their structure, formation mechanism and theoretical aspects are still subjects of scientific discussions. We propose model of hexagonal, helically…
Structuring of optical surfaces with surface-relief diffractive optical elements is an enabling technology for achieving considerable spatially varying changes in light propagation direction and wavefront curvature. This way, Bragg effects, angular and spectral selectivity and nearly 100% diffraction efficiency usuall…
Experimentally, the evolution of several mechanic properties (hardness, density, Young’s modulus, fracture toughness) is observed in nuclear glasses under irradiation. In this work, classical molecular dynamics calculations are performed to better understand fracture mechanisms in simplified nuclear glasses at atomist…
Residual stress and strain states, produced during cold drawing, play a key role in hydrogen embrittlement (HE) of prestressing steel wires, because of hydrogen accumulation in certain places of the material is affected by stress and strains fields. Taking into account that the drawing straining path directly affects…
Crystallization, a separation and purification process, is commonly used to produce a wide range of materials in various industries, and it usually begins with heterogeneous nucleation on a foreign surface in industrial practice and most other circumstances. Recent studies show that amorphous polymeric substrates are…
ZrW 2 O 8 /Cu composite powders were prepared by the electroless plating method. The phase transformation and the thermal expansion properties of the composite powders with different coating thicknesses were investigated. Differential scanning calorimetry and high-temperature X-ray diffraction analyses revealed that t…
In GaN-based light-emitting diodes (LEDs), using gold-based metals to serve as electrodes, light absorption is a problem that severely restricts the light extraction in LEDs. This study demonstrates the GaN-based LEDs with high reflectivity metals (Ag/Pt) onto an n-type GaN surface and transparent contact layer (indiu…
This Study purposed to review on the strength of geopolymer mortar and the change in liquidity depending on the mixing ratio of alkali-activator in developing the geopolymer mortar using bottom ash as binder. Alkali-activator was used through mixing 9M-Sodium hydroxide (SH) and 3 kinds of Sodium sillicate(SS) and its…
Y 2 O 3 , Er 2 O 3 and Nd 2 O 3 doped polycrystalline silicon nitride ceramics were prepared by hot press sintering method at 1850°C and 30 MPa pressure. 1 wt.% of each rare earth oxides (REO) were sintered with 3 wt.% MgO, 9 wt.% AlN and 87 wt.% α-Si 3 N 4 .The optical, mechanical and tribological properties of REO d…
In this paper we address a theoretical calculation of the electronic spectra of an Si-Ge atomic chain that is arranged in a Fibonacci quasi-periodic sequence, by using a semi-empirical quantum method based on the Hückel extended model. We apply the Fibonacci substitutional sequences in the atomic building blocks A(Si)…
Using the Otto geometry, prism coupling of microwave radiation to a metamaterial surface that supports a bound transverse-electric-polarized surface mode is demonstrated. The dispersion of this surface mode is characterized experimentally for incident radiation beyond the critical angle of the prism, and its resonant…
Reactive plasma spraying (RPS) has been considered as a promising technology for in-situ formation of aluminum nitride (AlN) thermally sprayed coatings. To fabricate thick A lN coatings in RPS process, controlling and improving the in-flight nitriding reaction of Al particles is required. In this study, it was possibl…
New ballistic protection systems based on alternative materials have been recently developed. One of the industry’s objectives is to develop lighter and stronger defensive systems, which allow higher mobility and safety for both vehicles and humans. This work studies the behavior of an aerospace protection against a p…