Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
In this paper we use the pseudofermion dynamical theory (PDT) to study the singular spectral features due to one-electron removal within the one-dimensional Hubbard model. The PDT reveals that in the whole ( k , ω)-plane such features are of the power-law type and correspond to well defined lines of three types: charg…
In the last three years, the possibility of light generation and/or amplification in silicon, based on Raman emission, has achieved significant results. However, limitations inherent to the physics of silicon have been pointed out, too. In this letter, an approach based on Raman scattering in porous silicon is investi…
Abstract The effect of poly(vinyl alcohol)(PVA) fine particles as the nucleating agent on the crystallization behavior of bacterial poly(3‐hydroxybutyrate)(PHB) was studied using differential scanning calorimetry measurements and polarized light microscope observation. The results were compared with the effect of PVA…
We have developed a simple method to design antisolvent-addition crystallization by using a numerical simulation. To design the reasonable conditions, e.g. the profile of antisolvent addition, seed loading, and minimum time cycle, a numerical simulation was applied using kinetic parameters obtained from experiments. R…
The direct conversion of benzene to phenol over Fe−ZSM-5 zeolite is investigated using quantum mechanical/molecular mechanical (QM/MM) calculations on a large model consisting of 683 SiO 2 units (2084 atoms). The active-site model for benzene hydroxylation involves a mononuclear iron-oxo species (Fe III O) located at…
Multiferroic bilayers composed of a magnetite (Fe3O4) and a BaTiO3 layer show nonlinear current-voltage characteristics in current perpendicular to plane configuration. The magnetoresistance of the bilayers is strongly bias dependent and can be switched from negative at low bias to positive at large bias. It is shown…
Pyrochlore type systems with generic formula (Bi1.5Zn0.5)(Nb0.5M1.5)O7 (M=Ti, Sn, Zr, and Ce) have been synthesized to investigate the influence of M on the dielectric properties. It was found that the incorporation of Sn or Ce resulted in a reasonably reduced dielectric constant. The incorporation of Zr and Ce has le…
Electrical conduction mechanisms and dielectric properties of thermally evaporated N-(p-dimethylaminobenzylidene)-p-nitroaniline thin films, El-Nahass, M M, Zeyada, H M, El-Samanoudy, M M, El-Menyawy, E M
A special mechanism of dislocation nucleation in deformed nanocrystalline materials (NCMs) is suggested and theoretically described. The mechanism represents nonlocal homogeneous nucleation of a nanoscale loop of “noncrystallographic” partial dislocation whose Burgers vector magnitude continuously grows during the nuc…
The effects of different amounts of segregated Ga (substitutional) on an Al grain boundary have been investigated by using a first-principles pseudopotential method. The segregated Ga is found to draw charge from the surrounding Al due to the electronegativity difference between Ga and Al, leading to a charge density…
The effect of ethanol extraction on plasma-polymerized allylamine (PPAA) films was investigated by measuring their thickness change using surface plasmon resonance (SPR) spectroscopy and optical waveguide spectroscopy (OWS). It was found that much of the freshly deposited PPAA films is lost upon ethanol treatment. The…
Nanoparticles of Ni 0.2 Zn 0.6 Cu 0.2 Fe 2 O 4 were prepared by the standard co-precipitation method. The formation of nanocrystalline mixed spinel phase has been confirmed by x-ray diffractograms. The sizes of the nanoparticles were estimated in the range 7–30 nm, which was confirmed by transmission electron microsco…
We report fast, simultaneous charge sensing and transport measurements of gate-defined carbon nanotube quantum dots. Aluminum radio-frequency (rf) single electron transistors capacitively coupled to the nanotube dot provide single-electron charge sensing on microsecond timescales. Simultaneously, rf reflectometry allo…
Arc channels tend to shrink mainly due to the fact that the plasma conductivity naturally increases with its temperature. In this letter, we report a method of generating a large area homogeneous arc plasma at atmospheric pressure. The plasma generator consists of an 80mm diameter graphite anode chamber and an 18mm di…
The existing experimental evidence suggests that exposure of a composite material to an electromagnetic field leads to changes in the material's strength and resistance to delamination. In this work, the mechanical response of transversely isotropic graphite/epoxy composite plates in the presence of an electromagnetic…
A numerical model to study the fatigue crack retardation in a self-healing material (White et al., 2001, Nature, 409, pp. 794–797) is presented. The approach relies on a combination of cohesive modeling for fatigue crack propagation and a contact algorithm to enforce crack closure due to an artificial wedge in the wak…
ADVERTISEMENT RETURN TO ISSUEPREVAddition/CorrectionORIGINAL ARTICLEThis notice is a correctionStability of the Gyroid Phase in Diblock Copolymers at Strong Segregation. Volume 39, Number 7, March, 14, 2006, pp 2449−2451.Eric W. Cochran, Carlos J. Garcia-Cervera, and Glenn H. FredricksonCite this: Macromolecules 2006,…
The crystal structure of 4-aminopyridinium tetrachlorobismuthate(III), [4-NH 2 PyH ][BiCl 4 ], has been determined at 100 and 260 K by the x-ray diffraction method as monoclinic space group, P 2 1 / c and C 2/ c , respectively. Differential scanning calorimetry and dilatometry reveal one perfectly reversible discontin…
The stability of the trapped electron mode is studied in conditions characteristic of internal transport barriers, namely steep density and temperature gradients. An analytic model allows a unified treatment of all collisionality regimes, from the dissipative limit to the weakly collisional regime (when the velocity s…
The new hydrated cesium borate Cs 2 B 7 O 9 (OH) 5 containing the first example of an isolated heptaborate anion was synthesized by the reaction of H 3 BO 3 with Cs 2 CO 3 at 170 °C. Its crystal structure was determined from single-crystal X-ray diffraction data and further characterized by FT-IR and DTA-TG. It crysta…