Materials Literature
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The “exciton gas-plasma” transition (the Mott transition) in a Si 0.93 Ge 0.07 /Si thin quantum well is investigated using low-temperature photoluminescence. It is demonstrated that this transition is smooth and occurs in the concentration range from approximately 6 × 10 10 to 1.2 × 10 12 cm −2 . At a temperature of 2…
Recent studies have led to a rapid increase in our knowledge of auxospore structure in diatoms. However, these studies have been limited to centric and raphid pennate diatoms, and there is still very little information on the sexual reproduction in araphid pennate diatoms. Using LM and SEM, the fine structure of the a…
We show through modeling and experimentation that the Berreman effect, physically manifested and investigated on planar surfaces for more than four decades, can be readily realized and studied in three-dimensional nonplanar structures. The Berreman effect is also used as a nonlocal probe to evaluate topography and hom…
Abstract This paper presents the computational study of the metal‐organic (MO) CVD of titanium dioxide (TiO 2 ) films grown using titanium tetraisopropoxide (TTIP) as a precursor and nitrogen as a carrier gas. The TiO 2 films are deposited under atmospheric pressure. The effects of the precursor concentration, the sub…
This paper provides an analytical approach for calculating the critical temperature in a magnetic component above which thermal runaway takes place. Thermal runaway implies that there is no steady-state balance between the generation of heat due to core and winding losses and the removal of heat by convection and radi…
Gain and noise figure improvements are demonstrated in a shorter wavelength region of a double-pass EDFA using a macrobending approach. The EDF is wound in a small radius to suppress the amplified spontaneous emission at the longer wavelength in order to achieve a high amplification in the shorter wavelength. Gain enh…
Abstract This paper presents the first example of an antiferroelectric banana phase in a bent molecule with a low bend angle of about 60°.
Magnetic susceptibility of complex perovskite-like oxides Gd 2 SrFe 2 O 7 and Gd 2 SrAl 2 O 7 was studied. A sharp decrease in the magnetic characteristics of gadolinium ferrite as compared to gadolinium aluminate points to the presence of strong antiferromagnetic interactions between the iron ions.
Carbon arc and chemical vapor deposition are at present the most efficient methods for mass production of single-walled carbon nanotubes. However, laser ablation is renowned for high quality nanotubes with narrow diameter distributions and hence is also of great interest. The aim of this work was to compare both the c…
ZnO thin films were grown by atomic layer deposition method at extremely low temperature using a reactive diethylzinc as a zinc precursor. Optical properties, electrical properties and surface morphology were examined by photoluminescence, Hall effect and atomic force microscope. The study shows correlation between op…
Firstly, it is theoretically justified that the microstrip line metamaterials consisted of the composite right/left handed transmission line is of the left handed property. Then, the metamaterials possessing the characteristic of wide frequency band are constructed with the composite right/left handed transmission lin…
Abstract Reactive compatibilization of recycled low- or high-density polyethylenes (LDPE and HDPE, respectively) and ground tire rubber (GTR) via chemical interactions of pre-functionalized components in their blend interface has been carried out. Polyethylene component was functionalized with maleic anhydride (MAH);…
In this paper, we use a thermodynamic model based on superposition of bistable contributions to describe the magnetization curve of materials with a magneto-structural phase transformation. In order to describe the decreasing coercivity with increasing temperature, we extend the model to temperature-dependent distribu…
We report the synthesis and characterization of Fe-FeOxcore-shell nanowires by thermal conversion of the Fe nanowires from pulse electrodeposition in anodized aluminum oxide (AAO) nanotemplates under various conditions. Well-defined core-shell nanostructure of the Fe-FeOxnanowires was confirmed by TEM and correspondin…
The novel electronic properties of graphene, including a linear energy dispersion relation and purely two-dimensional structure, have led to intense research into possible applications of this material in nanoscale devices. In this paper, we review the unique electronic properties of graphene that give it the potentia…
Magnetic, micromagnetic, and texture properties of the martensitic thin films prepared by magnetron sputtering of Ni$_{49.5}$Mn$_{28}$Ga$_{22.5 }$target on MgO(100) wafer are studied as a function of film thickness. The films exhibit 220-fiber texture. Moreover, in contrast to thick films, a considerable in-plane text…
The structural change of La 9.33−2 x (SiO 4 ) 6 O 2−3 x with increasing x value was investigated by means of laboratory X‐ray powder diffraction (Cu K α 1 ). Crystal structures of the three types of specimens with x =0, 0.06, and 0.085 were refined by the Rietveld method, with the anisotropic displacement ( U ) parame…
The adsorption of carbon monoxide on a clean and hydroxylated rutile (110) surface has been investigated using a periodic approach at DFT/B3LYP level. The hydroxylated surface was modelled by considering both terminal and bridging OH groups. The variation of the electrophilicity of the Lewis acid site near these group…
Abstract Summary: Two peptides (FEFEFKFK and HHHHHHFEFEFKFK) have been synthesised and their phase diagrams mapped out as a function of concentration and temperature. Both peptides formed self‐supporting fibrillar hydrogels above a similar critical molar gelation concentration with a fibril diameter corresponding to t…
Abstract Summary: In this study, maleic anhydride (MA), and citric acid (CA) used as the processing additive and plasma treatment to improve the processing ability and mechanical strength of biodegradable starch/poly (vinyl alcohol) (PVA) blends were studied. The melt flow index (MFI) of starch/ glycerol/PVA (300g/60g…