Materials Literature
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Solar cells with different silicon nanostructures have been fabricated on quartz wafers. A correlation between their photovoltaic properties and the conductivity was clearly found. The best results are achieved for amorphous silicon based nanostructures.
본 연구에서는 마이크로 시험편에 대하여 하중제어 인장-인장의 피로시험이 가능한 피로시험기를 개발하였다. 전자기식 액추에이터를 이용하였으며, 이 시험기를 이용하여 인장시험 뿐만 아니라 넓은 주파수 영역에서의 피로시험이 가능하다. 또한 피로시험중에도 고해상도로 마이크로 시험편의 되풀이 변형률을 측정할 수 있는 간섭변위계를 사용하였다. 피로시험기와 변위계는 안정적이고 그 응답속도도 매우 빨라서, 피로시험중에도 연속적으로 변위를 측정할 수 있다.
Methods of X-ray diffraction (XRD) and nuclear magnetic resonance (NMR) were used to investigate the effect of milling on the properties of the hydrogen-stabilized compound ZrTi 2 H 3.9 with the structure of the metallic sublattice of the C15 type. It has been found that the milling leads to a phase separation in the…
Hybrid Model Predictive Control (HMPC) framework is used to design a vehicular Adaptive Cruise Control (ACC) system. Modified Particle Swarm Optimization (MPSO) algorithm, combining standard Particle Swarm Optimization (PSO) with multi-objective optimization method, is used in the process of the receding horizon optim…
Damping of the polar vibrations determines the real limits of negative dielectric permittivity (DP) region as shown in this work. We obtain the simple quantitative criterion for the negative DP existence in the single oscillatory approximation model. We introduce this criterion as inequality between the damping consta…
In this study we exploited the classic Murray's synthesis for generating a hydrophilic CdSe quantum dot system in a single step procedure, with the aim of directly obtaining a material responding to the characteristic of polarity required in many end applications. 6-phosphonohexanoic acid was used as both ligand for g…
A comparative study of radiative recombination and tunnel migration in ensembles of P-doped Si nanocrystals embedded in wide-band dielectric matrix is performed. We have found the migration process to be strongly suppressed at donor concentration exceeding some critical value. At the same time, the radiative recombina…
Abstract Summary: The formation of four filament forming proteins was studied mainly by light scattering as a function of the scattering angle. Besides the molar mass Mw and the radius of gyration Rg the contour length L, was determined. The corresponding structure parameters are compared with those of the Aβ‐amyloid.…
Power transformers in their normal lifetime span often encounter unbalanced loads or even DC bias currents that shift the normal operational point of the unit. The influence of a delta connected winding on the magnetizing current waveform of a power transformer will be presented here in more detail. The behavior of an…
The interaction of hydrodynamic-wave and thermocapillary perturbations in a locally heated water film flowing down a vertical plate has been experimentally studied using a high-speed IR imager. It is established that, in the presence of fairly high heat fluxes, artificial disturbances can significantly influence the f…
Aluminium anodically oxidised in sulphuric acid electrolyte was pigmented by an electrolytic colouring process with the use of alternating and periodic reverse current. The applied pigmentation electrolytes were based on nickel. The study reports on resistance against humidity of a selective Ni–Al2O3 layer. The sample…
High power millimeter wave and terahertz sources are used in DNP/NMR spectroscopy to greatly enhance the NMR signal. A key issue is the efficient coupling of the source power to the sample. We present HFSS calculations showing that the MIT 250 GHz DNP/NMR system provides a B1value of 13 μT/W1/2. The simulation shows t…
Overviewed are new experimental methods for investigating the processes of phase formation during SHS. The first experiments using penetrating synchrotron radiation and energy dispersive detectors for different classes of complex inorganic materials were carried out in ESRF (Grenoble, France), LURE (Orsay, France) and…
In general higher packaging densities, thinner substrates and lighter products can be achieved using flexible printed circuit boards (FPCB) compared to traditional thicker fiber-reinforced printed circuit boards. Polyimide (PI) is popular substrate material in FPCBs due to its excellent properties. Liquid crystal poly…
A generalized macroscopic representation of electrical steels used in transformer manufacturing industry is developed. The proposed representation is specifically formulated for integration in the finite element method. Usage of the specific technique enables the accurate evaluation of electromagnetic field distributi…
Electrical machine standards were dominated by the manufacturers until API 541 RP was created in 1972. Up until the mid 1960's, manufacturers constantly re-designed the electrical parts of the machine without user assistance. Critical motors servicing large pipeline pumps were specified with little or no features. All…
We report on the computational analysis of a triangular core-multishell nanowire light emitting diode with three joint InxGa1-xN active layers. The different crystal orientations of these layers lead to different polarization induced internal fields and transition energies. The simulation approach accounts for these e…
We prepare optrodes of fiber optic plastic with sol-gel technique. Suitable concentration of carbone nanotubes (CNTs), phenol red, bromophenol blue and cresol red, design optrodes with fiber optic plastic. The surface charge of silica and the refractive index, which play an important roll on the fiber, modifies the co…
Lead-fluoride nano-glassceramics doped with ytterbium and erbium have been developed and synthesized. The influence of heating on the green up-conversion luminescence of erbium has been experimentally investigated. Nano-glassceramics are promising candidates for temperature sensors.
Catastrophic equipment failures continue to occur today due to ferroresonance. Ferroresonance is a nonlinear oscillatory phenomenon that occurs in capacitively coupled transformers or reactors under certain conditions. In this paper a harmonic balance method is used to determine periodic solution to the nonlinear ODE…