Materials Literature
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Abstract Mesoporous silicas MCM-41 with larger and variable pore size were synthesized hydrothermally by using cetyltriethylammonium bromide (CTEAB) which has a larger hydrophilic head-group compared to cetyltrimethylammonium bromide (CTAB) as templating agent. Various factors such as surfactant and silica molar ratio…
Electroluminescence (EL) in an electrolyte-insulator-semiconductor system is used to study oxide layers in Si-SiO 2 -Si 3 N 4 and Si-SiO 2 structures prepared using various techniques. The EL spectra of all the structures contained the 2.7-eV emission band characteristic of the radiative relaxation of excited sililene…
The interaction of an Ar ion with a C 60 @C 240 @C 540 carbon onion and an Ar ion beam with a C 60 @C 240 @C 540 @C 960 carbon onion are studied by molecular dynamics. The energy threshold for the formation of a vacancy in a pentagon of the onion fullerene shell is examined in two temperature regimes (300 and 1000 K).…
The power flow across a closed surface containing moving media is considered using the Poynting theorem. Various components of this power are identified with known expressions. The effects of hysteresis are considered in a linearized form by assuming hypothetical relations between field vectors. These relations result…
When a sandwich structure is subjected to transverse loads, the face sheets carry bending moments as tensile and compressive stresses and the core carries transverse forces as shear stresses. The core is typically the weakest component of the structure and is the first to fail in shear. In this study the shear fatigue…
Abstract A tetranucleating macrocyclic ligand with four endogenous phenolic groups is obtained by the condensation of 3-aminomethyl-5-methylsalicylaldehyde in the presence of metal ion as two tetranuclear NiII complexes, [Ni4(L)(OH)(H2O)4](ClO4)3 (1) and [Ni4(L)(O)(dmf)4](ClO4)2 (2), and a dinuclear MnIII complex, [Mn…
The transient behavior of homeotropic-planar relaxation in surface stabilized cholesteric liquid crystals bounded by parallel substrates has been investigated both experimentally and numerically. By monitoring the evolution of transient transmittance, we observe that the homeotropic-planar relaxation after the electri…
Protein TT0402 from Thermus thermophilus HB8 exhibits about 30-35% sequence identity with proteins belonging to subgroup IV in the aminotransferase family of the fold-type I pyridoxal 5'-phosphate (PLP)-dependent enzymes. In this study, we determined the crystal structure of TT0402 at 2.3 A resolution (R(factor) = 19.…
iamonds, whether rough or cut (figure Gemological laboratories routinely evaluate the carat weight, color, clarity, and cut characteristics of faceted diamonds, and record them on a report that serves not only as a basis for the gem's value, but also as a record that can help in the later identification of a stone. Th…
Amorphous poly(ethylene terephthalate) (PET) can be stretched at low tension without causing any observable crystallization at temperatures above T g . This resultant increased length with no measurable change in orientation is called superdrawing. Superdrawing of hollow PET fibers in the circumferential direction is…
Yarn tension variation on the knitting needle is investigated using simulated knitting conditions with a newly developed test rig. Among the several conditions observed in the testing situation are needle gauge and yarn feeding angle to the knitting points affected by yarn tension variation. However, yarn feeding spee…
Abstract The study on the factors influencing sulfinatodehalogenation of perfluorohexyl chloride plus octene‐1 by using Na 2 S 2 O 4 /NaHCO 3 discovered that among the various solvents tested ( e.g . Me 2 SO, NMP, DMAc, CH 3 CN, CH 3 CN/H 2 O) at different temperatures, Me 2 SO was found to be the most suitable solven…
We have investigated the reason behind the enhancement of dielectric constant ( ε ), which occurred in CeO 2 directly grown on Si(111). ε of directly grown CeO 2 is enhanced to 52, which is twice as large as the reported value. From in-plane X-ray diffraction measurements and electron diffraction pattern observations…
Quantum mechanics is used to study the influence of the chemical composition on the elastic properties of austenitic stainless steels. Fe based alloys comprising approximately 15% Cr and 8% Ni are predicted to have the largest hardness among the usual austenitic steels, which, however, is associated with increased bri…
The effect of the time of shearing on the skin comfort of fabrics produced from Mediterranean wool is measured. These studies confirm that shearing time can affect fabric skin comfort. The observed changes in fabric skin comfort are in line with the observed differences in the percentage of coarse fiber ends in the pr…
Flexural strength and fracture toughness of molybdenum disilicide and its composites with 10 wt% TiB 2 and 10 wt% TiB 2 + 10 wt% SiC, synthesized by the hot‐pressing technique, were evaluated as a function of temperature, ranging from ambient temperature to 1600°C. Results show that the composites have higher strength…
Lead titanate (PbTiO 3 ) is difficult to sinter without additives, even when a spark‐plasma‐sintering technique is applied. The high tetragonality, c / a , of PbTiO 3 causes destructive strain after sintering. We found that a sintered body of PbTiO 3 could be obtained, when the PbO/TiO 2 value was <0.9. However, de…
For generations humans have been engineering pillars that have more than one function. The giant stone pillars of the 9th-century Cordoba Mosque in Andalusia, Spain, for example, provide both structural stability and aesthetic appeal. Now researchers in the US have built pillar structures at the nanometre scale that c…
The properties of wavelength-division multiplexed (WDM) narrowband filters used in tilted collimated light are described. The wavelength shift for s polarization in a low-index-spacer filter is larger than that for p polarization when the filter is tilted, but it is smaller in a high-index-spacer filter. Therefore the…
This paper presents the results of studies on a range of different catalyst substrates warmed by engine exhaust. Engine speeds were in the range 1200–3000 r/min. One substrate was non-washcoated, four were washcoated but non-reactive and four were washcoated and reactive. The temperature at four locations within the n…