Materials Literature
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The influences of aluminum doping, oxygen pressure, and substrate temperature on the transparent conductive properties of ZnO:Al (AZO) films grown by pulsed laser deposition (PLD) were investigated using scanning electron microscope, atomic force microscope, X-ray diffraction, Hall effect measurements, and optical tra…
In order to study the characteristics of the films deposited by pulsed plasma thruster plume and assess contamination arising from the exhaust plume, the compositions of the pulsed plasma thruster plume are studied by means of mass spectrum analysis, the structural properties of the films deposited at different angles…
Using radio-frequency plasma enhanced chemical vapor deposition, based on the influences of discharge power on structural and photoelectric properties of μc-SiGe:H thin films, RF power profiling technique is developed during the deposition of μc-SiGe:H intrinsic layer. The optimized μc-SiGe:H intrinsic layer not only…
Based on the gaussian-type distributions of bond energy and coordination number for barium titanate systematic ferroelectrics doping with a certain quantity of dopants, the bond energy and coordination number fluctuation model is used to derive the relationship between peak of dielectric constant and testing frequency…
The dielectric loss of the CaCu3Ti4O12 ceramic is high, and the mechanism of the loss is not clear, which restricts its application. The CaCu3Ti4O12 ceramic samples are synthesised by solid state reaction method and coprecipitation method. The electronic relaxation of deep bulk traps at the depletion layer edge, carri…
钨氧化物纳米线在高灵敏度低功耗气体传感器中极具应用潜力, 且通过掺杂改性可进一步显著改善其敏感性能. 本文以WCl6为钨源, NH4VO3为掺杂剂, 采用溶剂热法合成了钒掺杂的W18O49纳米线. 利用扫描电镜、透射电镜、X射线衍射、X射线光电子能谱仪表征了纳米线的微结构, 并利用静态气敏性能测试系统评价了掺杂纳米线的NO2敏感性能. 研究结果表明: 五价钒离子受主掺杂进入氧化钨晶格结构, 抑制了纳米线沿轴向的生长并导致了纳米线束的二次集聚; 室温下, 钒掺杂W18O49纳米线接触NO2气体后表现出反常的p型响应特性; 随工作温度逐渐升高至约110 ℃时, 发生从p型到n型的电导特性转变; 该掺杂纳米线气敏元件对浓度低至80 pp…
n-type porous silicons are prepared by the electrochemical corrosion method, on which tungsten oxide thin films with different thickness values are sputtered using DC reactive magnetron sputtering. The structures of ordered porous silicons and tungsten oxide thin films are characterized using field emission scanning e…
In this work, we present a new design of a tunable nanofocusing lens using a circular grating of linear-variant depths and nonlinear-variant widths. Constructive interference of cylindrical surface plasmon launched by the subwavelength metallic structure forms a subdiffraction-limited focus, the focal length can be ad…
Secondary quantized self-consistent Dirac – Hartree – Fock approach has been used to \nconsider electronic properties of monolayer graphene stipulated by spin-polarized states. \nThe advantage of such an approach compared with recently used pseudo-relativistic massless Dirac approach is its ability to explain fine exp…
One of the models for the carbon nanotube array with parallel grids is proposed. The actual electric field at the top of the carbon nanotubes and the field enhancement factor are calculated analytically with the image charge method and floated sphere model. The effects of the geometrical parameters of the device and t…
The thermal effects induced by high-power diode pumping in the Nd:YVO4 slab laser crystal are numerically modeled. Using three-dimensional (3D) finite volume method, an accurate numerical solution based on heat transfer equation is achieved. The transient temperature distribution curves and the steady state 3D tempera…
The phenomenology of a LiFeAs superconductor can be explained in the framework of four-band s+-wave Eliashberg theory. We have examined the experimental data available in the literature and we have found that it is possible to reproduce the experimental critical temperature, the gap values and the upper critical magne…
Applying statistical thermodynamic models for chain configurations in combination with linkage analysis, molar mass distribution and small angle X-ray scattering data allow the unambiguous structural elucidation of branched fructans. The radius of gyration of fructans can be accurately predicted by applying a random f…
Molecular dynamics simulations are performed to study the diffusion behavior of low-energy hydrogen atoms in bcc tungsten (001). The simulation results show that when the energy of vertically incident hydrogen atoms is in a range of 0–20.0 eV, their retention probability increases rapidly; in the whole incident energy…
The numerical simulation of Friction Stir Welding processes involves the coupling of a solid mechanics approach under large strains and large strain rates and heat transfer. The eulerian formalism leads to specially efficient finite element simulations of the matter flow under steady conditions. But with such a formul…
The group of "221" compounds crystallizing in the Mo 2 FeB 2 structure type comprises more than 400 members known so far. The onset of magnetic moments and their ordering can be studied in the actinide representatives by tuning the 5f-ligand hybridization strength, including detailed investigations of the non-Fermi li…
This paper presents a compact wideband rat-race hybrid composed of composite right/left-handed transmission lines (CRLH-TLs). Using CRLH-TLs with phase delays of −90 degrees and a right-handed transmission line (RH-TL) with 90 degrees at a design frequency, a relative bandwidth of about 36 % can be obtained at the des…
The cutting patterning is an essential part of the engineering process in textile architecture. In the past it was very costly and time-intensive if the waste of material was to be minimized. Nowadays we have fast or even automatic patterning tools where those problems are solved efficiently as we are willing to show…
With the density of function with pesudopotentional and plane-wave method, we study the strain effect on band structure of multi-layered BN film. It is found that the band gap of BN film decreases linearly with the increase of tensile strain, and the slope of the band gap-strain curve is independent of the BN stacking…
The line focusing characteristics of axicon illuminated by non-diffracting Bessel beam was analyzed in terms of Hankel theory and diffraction integral theory, and a new kind of method to generate periodic bottle beam was put forward, i.e. Talbot effect bottle beam was generated by axicon illuminated by non-diffracting…