Materials Literature
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In this study, it was modified a tensile Hopkinson bar with which it can be carried out tests up to a predetermined strain. During dynamic test using a Hopkinson bar, the final strain reached by the specimen was controlled by a stopping elongation system; this system include a snap ring to attenuate the effects of the…
Abstract Aliphatic‐aromatic hyperbranched polyesters of reasonable degrees of branching ( DB 's) but of relatively low molar masses were prepared from 3,5‐bis(bromomethyl)benzoic acid ( 2a ). 2a was synthesized by radical bromination of 3,5‐dimethylbenzoic acid. The polymerization of 2a and that of the potassium salt…
Raman scattering, X-ray photoemission spectroscopy (XPS), Fourier transform photocurrent spectroscopy (FTPS), Rutherford backscattering (RBS) and electron paramagnetic resonance (EPR) method have been used for characterization of diamond layers deposited by microwave plasma enhanced chemical vapor deposition (MWPECVD)…
The polarization-dependent transmission of light through an electrically controllable in-line-type polarizer that is made from polymer-dispersed liquid-crystal spliced optical fibers is discussed experimentally and theoretically. This in-line-type optical splicing method has the advantage of low transmission loss when…
This study reports a hitherto undescribed endophytic diatom that forms dense unialgal colonies in the mucilage that fills the internodes of a red alga, Coelarthrum opuntia. The diatom is very similar to Gyrosigma tenuissimum, in that the valve outline is delicate and linear, although it has a central raphe with extern…
Ni-Zn(-Co) ferrite films of 0.5-0.6 /spl mu/m in thickness were deposited on glass substrates by the spin-sprayed ferrite plating at as low as 90/spl deg/C applying external magnetic field of 50 Oe. Under no bias field, while the film without Co substitution (Ni/sub 0.21/Zn/sub 0.27/Fe/sub 2.52/O/sub 4/) exhibited a r…
Abstract The hydrothermal reactivity of a Mg-vermiculite from Santa Olalla (Spain) was studied experimentally at 150 and 300ºC, 75 and 100 bars, respectively, in (Na,K,Ca,Mg) chloride and sulphate solutions (liquid/solid ratio = 10). The formation of mixed-layer clays is demonstrated by FT-IR spectroscopy, X-ray diffr…
The diffusion behavior of water through epoxy coatings with micaceous iron oxide (MIO) at different pigment volume concentration (PVC) was studied by EIS techniques. Experimental results showed that, in the initial diffusion period, the diffusion processes of water through epoxy coatings immersed in 0.5 M sodium chlor…
Prismatic shear and round notched tensile specimens with different geometries for variation of triaxiality were subjected to high strain rate loading in a Split-Hopkinson-Pressure-Bar device and in a high strain rate tensile machine, respectively. In finite element simulations with only a deformation model (Johnson-Co…
There is much speculation about the origin of fatigue in ferroelectric thin films that have been grown by sol-gel on various substrates. One of the most important substrates for growing thin film ferroelectric materials is native SiO2. After the deposition of suitable electrode, most common are Ti-Pt, a thin film of a…
The conductivity σ, Hall coefficient R , and thermoelectric power α 0 of p -Ag 2 Te were studied in the temperature range of 300–550 K. Inconsistency between the signs of R and α 0 was observed at 420–550 K. These results are interpreted within the two-phase model with spherical constant energy surfaces. It is establi…
-+ The composition a nd properties o f a series of sheath/core composite polypropylene fibres nonwovens with different phase ch ange mate ri al (PCM) contents in the core have been studi ed usin g SEM. DSC a nd temperature sensors. It is observed that th e PCM content in the fibre . sheath/core ratio and th e conte nt…
This paper gives an overview of recent advances in applying magnetoelastic thin films in inductive high-frequency devices. Single and multilayer films were fabricated and optimized with respect to application in stress-sensitive inductors, which are operated at high frequencies. These films require high magnetic perme…
The weathering of lutites in aridic or near‐aridic environments leading to soil horizons is not well known. Lutites are a common soil parent rock composed of silt and clay, that may be massive or may have their sedimentary origin marked by layers of alternating color or granulometry, or by fissility along planes. Luti…
Abstract Ultraviolet (UV) polymerizable discotic liquid‐crystalline (DLC) molecules (2,3,6,7,10,11‐hexakis(4′‐acryloy‐ m ‐alkyloxybenzoyoxy)triphenylene [HAHBT‐ m , where m was the number of methylene units, and here m = 6 (HAHBT‐6)]) were assembled to form a negative retardation film with an oblique optical axis on a…
Ir/Al2O3, Ir-Ru/Al2O3 and Ru/Al2O3, catalysts with total metal contents of 30% were prepared using the methods of incipient wetness and incipient coimpregnation wetness and were tested in a 2N microthruster. Their performances were then compared with that of the Shell 405 commercial catalyst (30% Ir/Al2O3). Tests were…
Refractive indices of the nanocrystalline Y 3 Al 5 O 12 ceramic and a garnet single crystal of the same composition have been measured. In the visible and near IR range (0.4–1.064 μm), the prism method was used; in the medium IR range (2–6.2 μm), the interference method with the use of thin plates was applied. The ref…
Abstract Compatibility of PVC with liquid alkyltin alkylthioglycolate stabilizers was studied by thermal methods, including isothermal calorimetry of mixing, DSC, DMA, and dielectric relaxation. The enthalpy of mixing of PVC with the series of alkyltin alkyl thioglycolates was measured over the entire concentration ra…
In a 15‐mol%‐CaO‐stabilized zirconia (CSZ) specimen, the grain boundaries at the surface region exhibited a lower electrical resistance than those at the inner region. However, when up to 1.5 mol% Al 2 O 3 was added, the grain boundaries at the surface showed a higher resistance. These results were explained in terms…
This paper describes the re sults of a st udy of a bl ack coating produced on aluminium AA2219 alloy using a process that involves creation of a hard ceramic oxide layer on the surface of the alloy by plasma electrolytic oxidation (PEO) known as the ‘KERONITE “ ’ process. Coating microstructure has been examined and t…