Materials Literature
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Exciton binding energies in InGaAsP/InP quantum well with different contents of In are calculated through variational method in the effective mass approximation. The variation of exciton binding energy as a function of well width, In content, and applied external electric field is studied. It is shown that the exciton…
The determinants of resonant frequency temperature coefficient (τf) have been analyzed by the approximate treatment of Clausius-Mossotti equation. It is suggested that the value of τf can be adjusted by changing the contribution proportion of ionic polarization or electronic polarization for the dielectric constant. R…
Based on the tight-binding model, the electronic state and band of zigzag graphene nanoribbons are given analytically by a new method. The results show that there are only two kinds electronic states, i.e., the standing wave state and edge state. For the standing wave state, the wave function is sine function and the…
After several decade developments the critical dimension of an integrated circuit will reach its limit value in the next 10-15 years, and the substitute materials been to be researched. Graphene has beed considered the most likely candidate, however, pristine graphene does not have a bandgap, a property that is essent…
The high-strain dynamic behavior of NiTi shape memory alloy has significant applications in several fields such as military af- fairs, aerospace. In order to investigate the transformation behavior in NiTi alloy, induced by dynamic mechanics, the shock-loading experiments are performed using a single stage gas gun at…
Based on Maxwell's curl equations, the electric component and the magnetic component in magnetoelectric metamaterial plate are equivalent to the surface electric current and the surface magnetic current respectively. By calculating the total electric field and the total magnetic field in a magnetoelectric metamaterial…
In this paper, the structural properties of TiAl3 intermetallics are investigated by the plane-wave pseudopotential density functional theory method. The calculated results are consistent with experimental and other theoretical ones. Through the quasi-harmonic Debye model we calculate the thermodynamic properties and…
In this paper, the Dy3+-doped borosilicate glasses are fabricated by high-temperature melting method. The excitation and emission spectra of the glasses are measured to discuss their spectroscopic properties. The effects of the glass composition and the Dy3+ doping concentration on the emission spectrum and the lumine…
A strategy is presented to acquire active terahertz (THz) metamaterial by incorporating negative differential resistance carbon nanotubes. Furthermore, we propose a method of extracting active metamaterial effective parameters. This new method can effectively solve the problems of signs and multi-branches, while the t…
The study deals with the effect of the SPS parameters and LiF doping on the mechanical and optical properties polycrystalline magnesium aluminate spinel (PMAS) with emphasis on the grain size of the final product. Sintering at 1300°C of undoped powder yielded fully dense submicrometer (0.4–0.6 lm) samples with elevate…
The single isolate vacancy in diamond exists in three charged states, neutral, negative and positive; and many complicated defects such as di-vacancies, impurities-vacancy complexes could also be formed in diamond. In this paper, we investigate the optical properties of the irradiation-induced neutral vacancy in diamo…
Due to high-power fi ber lasers and fi ber-coupled thin disk lasers, the application fi elds of high-power lasers continue to expand, especially for laser processing in automobile, aircraft, and train industries. Based on current applications, laser applications for nuclear technology also show promise because nuclear…
Time delay estimation (TDE) is a well-known technique to investigate poloidal flows in fusion plasmas. The present work is an extension of the earlier works of A. Bencze and S. Zoletnik 2005 and B. T´al et al. 2011. From the prospective of the comparison of theory and experiment it seem to be important to estimate the…
Molecular dynamics simulations of polyethylene/silver-nanoparticle composites are implemented to calculate the structures, electrical, thermal and mechanical properties, thereby investigating their relationships with the nanoparticle dimension and simulation temperature. The results show that polyethylene/silver-nanop…
The influence of polymer environment on the luminescent properties of barium zirconate nanocrystals has been studied by cathodoluminescence (CL) spectroscopy. It was found that a polystyrene (PS) shell around the BaZrO 3 nanocrystals significantly modifies the CL spectra. This phenomenon can be explained by interactio…
Piezoelectrets are made from cellular polypropylene(pp)foam sheets by using a pressed-gas expansion followed by corona charging process. The elastic modulus, piezoelectricity and the acoustic response of such fabricated films are investigated. The results show that the Youngs modulus in the thickness direction is more…
In this paper, we simulate and experimentally validate a polarization-independent transmission absorption metamaterial absorber based on electromagnetic resonance. The metamaterial absorber can absorb the high-frequency electromagnetic wave, and the low-frequency wave can transmit through the absorber. The tested resu…
The structural and electronic properties of β-SiC/(15, 0) carbon nanotube (CNT) and β-SiC/(16, 0)CNT core-shell structure are studied by using first-principles method based on the density functional theory. The results show that the two heterostructures are metallic. Their metallic properties are contributed by the at…
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Using a long-distance microscope imaging system and a lock-in phase integrate technique, optical measurements demonstrate that the evolutional behaviors of a phospholipid-shelled micro-bubble, a kind of ultrasound contrast agent, under two ultrasound frequencies and different pressures. Dozens of frames of an oscillat…