Materials Literature
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Conventional antireflection coating by thin films of quarter-wavelength thickness is limited by material selections and these films’ refractive indices. The optimal design by non-quarter-wavelength thickness is presented in this study. A multilayer thin-film model is developed by the admittance loci to show that the t…
The electrical properties of Ca 0.33 CoO 2 epitaxial films are investigated as the Ca 2+ -arrangement is transformed. Despite identical Ca-content, annealing the film caused the Ca-arrangement to change from a √3 a × √3 a hexagonal type to a 2 a × √3 a orthorhombic type, which was confirmed by X-ray diffraction and sc…
Red upconversion (UC) emission at 626 nm is obtained from a LiNbO(3) crystal codoped with Er(3+) and Eu(3+) under 800 nm femtosecond laser excitation. Energy transfer from ((2)H(11/2,),(4) S(3/2)) levels of Er(3+), which are excited by excited state absorption, to (5)D(1) of Eu(3+) followed by rapidly relaxing to (5)D…
Thiolated dimeric tetramethylrhodamine (TAMRA) was synthesized in a straightforward procedure utilizing commercially available 5(6)-succinimidyl TAMRA and cystamine hydrochloride. The thiol-containing TAMRA dimer displayed distinct spectral properties in reduced and oxidized forms; covalent dimer formation produced gr…
Pd-cluster-functionalized carbon nanotubes (CNTs) have been shown experimentally to be effective hydrogen sensors. Semiconducting CNTs exhibit much higher sensitivity than ensemble (mixed) ones. Using the nonequilibrium Green's function method combined with the density-functional theory, we simulate and contrast the (…
Webbings are used in parachute assemblies as reinforcing units for the strength they provide. The strength of these seams is an important characteristic which has a substantial influence on the mechanical property of the parachute assemblies. It is well established that factors such as fabric width, folding length of…
Purpose The purpose of this paper is to investigate microwave reflection, transmission, and complex permittivity of p-toluene-2-sulfonic acid doped conducting polypyrrole coated nylon-lycra textiles in the 1-18 GHz frequency with a view to potential applications in the interaction of electromagnetic radiation with suc…
Based on the hyperbolic dispersion relation for a strongly anisotropic medium, we propose a kind of pyramid-shaped hyperlenses (PSHLs) consisting of multilayer of planar silver and dielectric films for three-dimensional (3D) subdiffraction imaging at optical wavelengths. Numerical simulations by using the finite diffe…
The structuring effects of the core and sheath on the tensile properties of core-spun yarns need to be systemized in order to meet potential application requirements. In this study, the core— sheath structuring effect was modeled theoretically, using a spring and damper as mechanical elements. Core-spun yarns with hig…
The 1 × 1 rib knitted fabric is mostly used for collar, cuff, waistband, etc. of outerwear knitted garments and it is also very popular nowadays for using as preforms of knitted composite structures. A geometrical model to predict the dimensional properties of conventionally knitted 1 × 1 rib fabric is created and giv…
The synthesis of CdTe nanocrystals capped with thiolated methoxypolyethylene glycols can be performed both in water and in toluene. The evolving nanocrystals are compatible with a variety of different solvents. A phase transfer of nanocrystals initially prepared in toluene to water and subsequently to chloroform occur…
Horizontally and vertically aligned helical polyacetylenes (H-PAs) are synthesized by using orientation-controlled chiral nematic liquid crystals (N*-LCs) consisting of vertical orientation inducers, chiral dopants and parent N-LC. The chemically graspable pictures of horizontal and vertical N*-LCs and the correspondi…
Here, we report some new iron arsenide superconductors of REFeAsO 1−δ (RE = Ho, Y, Dy and Tb) that were successfully synthesized by a high-pressure synthesis method with a special rapid quenching process, with the onset superconducting critical temperatures at 50.3, 46.5, 52.2 and 48.5 K for RE = Ho, Y, Dy and Tb, res…
Bulk samples of TbFeAsO 0.9 F 0.1 ( T c on = 50 K) were measured by point contact Andreev reflection spectroscopy. The spectra show unambiguous evidence for multiple gap-like features plus the presence of high-bias shoulders. By measuring the spectra as a function of temperature with both gold and superconducting niob…
This paper reports the variability of mechanical properties of banana fibers with respect to diameter, testing speed and gauge length. We report interesting findings on banana fibers. Tenacity of the fibers significantly improved for the fibers with lower linear density. An increase in speed resulted in improvement of…
We report a simple approach for the direct and nondestructive assembly of multi-sheeted single-walled carbon nanotube book-like macrostructures (buckybooks) with good control of the nanotube diameter, the sheet packing density, and the book thickness during the floating catalytic growth process. The promise of such bu…
The appearance of mixed crystals of organic compounds is frequently discussed in recent literature and it can cause difficulties in the downstream process of drug purification. The chiral malic acid system is an example of a system of enantiomers that exhibits partial solid solutions in a large composition range. Meas…
In our previous paper, we synthesized poly-3-hydroxybutyrate [P(3HB)] by using the water-organic-solvent two-phase reaction system (TPRS), in which ( R )-3-hydroxybutyrylCoA [( R )-3HBCoA] was continuously supplied to PHA synthase by the ester exchange reaction between CoA and thiophenol in thiophenyl ( R )-3HB [( R )…
We report heat capacity measurements of the pnictide materials SmFeAsO 1- x F x , NdFeAsO, LaFeAsO 1- x F x and LiFeAs. For SmFeAsO 1- x F x , with x close to 0.1, we use 3 He measurements to demonstrate a transfer of entropy from the peak at T N to a previously unidentified ∼2 K feature, which grows with increasing d…
The crystal and magnetic structures of the spinel compounds ${\text{ZnCr}}_{2}{\text{S}}_{4}$ and ${\text{ZnCr}}_{2}{\text{Se}}_{4}$ were investigated by high-resolution powder synchrotron and neutron diffraction. ${\text{ZnCr}}_{2}{\text{Se}}_{4}$ exhibits a first-order phase transition at ${T}_{N}=21\text{ }\text{K}…