Materials Literature
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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…
Air-jet textured, textured-twisted and textured-pli ed yarns have been made from apparel -grade polyester flat yarns and compared with commercial cotton a nd spun polyeste r sewing threads for prope rti es a nd seam efficiency. The uniformity characteri stics of air-jet textured sewin g threads are far superior to tho…
A direct expression system for the solubilized catalytic domains of NADPH-cytochrome P-450 reductase (sCPR) from rat (RsCPR) and porcine (PsCPR) in Escherichia coli cells was constructed using the expression plasmid pCWori(+). PsCPR was minimally expressed, whereas RsCPR was highly expressed. Replacement of the nucleo…
We investigated the correlation between surface conductivity and surface band profiles of hydrogenated single crystal diamond (type IIa and IIb) by a combination of total photoelectron yield spectroscopy and I–V measurements. Electron and exciton contributions in the photoyield spectra are clearly separated and their…
A new method of applying a dynamic load directly to a tensile specimen was developed. By combining the new method with the testing method based on a sensing block [1-5], we improved the testing method to obtain the entire tensile stress-strain curves for a wide range of strain rates on the order of 10 -3 ∼10 3 s -1 ,…
Abstract A series of cellulose‐phenol‐formaldehyde (LCPF) and cellulose‐urea‐formaldehyde (CUF) resins were produced using banana waste. Detailed structure and quantitative information was provided by FT‐IR and mass spectroscopy. The main interests were the ability to use banana waste as a source of cellulose in the c…
We synthesized the block copolymer of poly(norbornene-dicarboxcylic acid) and poly(norbornene) at room temperature, using ring opening metathesis polymerization. We then templated the CoFe/sub 2/O/sub 4/ nanoparticles within the polymer matrix, utilizing the self-assembled nature of the block copolymer. We used transm…
Complex impedance analysis at cryogenic temperatures has revealed that the bulk and grain boundary properties of BaTiO 3 polycrystals are very sensitive to the oxygen partial pressure during sintering. Polycrystals sintered at P O2 as low as 10 −15 atm were already electrically heterogeneous. The activation energy of…
Abstract The degree of molecular alignment averaged over meso‐length scale areas within thermotropic liquid crystalline polymer (LCP) fibers has been intensely studied over recent years. In this work, the degree of molecular orientation is found from spatially‐resolved electron diffraction of areas as small as 100 nm…