Liwei, ZhouLiqiu, WeiNa, SongDesheng, Zhou...
19页查看更多>>摘要：Ionic wind actuators are widely used in temperature control, food drying, aircraft propulsion, combustion, air purification, and many other fields. The energy conversion efficiency of ion-wind actuator has been low for a long time. In this paper, a lumped parameter circuit model is established for the surface dielectric barrier discharge structure, and the energy conversion path in the discharge process is proposed for the first time. According to the circuit topology, part of the energy loss is calculated. Based on the mathematical calculations of the circuit model, we discovered the possibility of "negative capacitance effect" in the plasma area, and the experimental verified the correctness of the theoretical deduction and prediction. Meanwhile, the results show that the equivalent capacitance of the solid dielectric is equal to the bottom slope of Lissajous graph, and the negative capacitance effect can effectively reduce the proportion of solid dielectric loss and relaxed polarization loss. The negative capacitance effect improves the energy conversion efficiency of the ionic wind exciter, and the maximum increase ratio is about 47.8%. With the increase of voltage, the deviation between the calculated value of theoretical model and the measured value increases gradually, and finally stabilizes at about 41%.
原文链接:
NSTL
Elsevier
Garcia-Cervantes, H.Lopez-Becerra, A.Rodriguez-Gonzalez, R.Rodriguez-Vargas, I....
6页查看更多>>摘要：Bandgap engineering in graphene has become a fervent subject of research due to its relevance in technological applications. In this work, we proposed massive-massless graphene superlattices (MMGSLs) to tune the angle dependent transmission properties. We have considered breaking symmetry substrates to generate massive and massless regions. We report an angular dependence of the transmission gaps and minibands as a function of the angle of incidence of the Dirac electrons in MMGSLs. Our results show that the transmission gaps and minibands have a trigonometric angular dependence based on the secant in the entire transmission energy range. In addition, the transmission gaps and minibands are well-defined at normal incidence, in contrast to gated graphene superlattices. These findings indicate that MMGSLs could be a possibility for bandgap engineering in graphene.
原文链接:- NSTL
- Elsevier
Talla, A.Suliali, N. J.Goosen, W. E.Urgessa, Z. N....
10页查看更多>>摘要：Titanium dioxide (TiO2) nanotubes prepared on titanium metal substrate are thermally annealed at various temperatures in nitrogen, air, oxygen and vacuum. In all annealing atmospheres, except in vacuum, the anatase phase becomes less prominent than the rutile phase for annealing temperatures above 600 ?. The anatase phase is stable above 600 ? in vacuum but does not evolve significantly up to 900 C. The morphologies of the nanotubes tend to deteriorate with increased annealing temperature, particularly in nitrogen, air and oxygen atmospheres. However, the integrity of the nanotubes is maintained up to 900 ? in vacuum. The photoluminescence emissions suggest mainly the presence of oxygen vacancies and self-trapped excitons, with respective emission bands around 2.5 eV and 2.3 eV. The results show that the annealing temperature and atmosphere strongly influence the crystalline and optical properties of the TiO2 nanotubes.
原文链接:- NSTL
- Elsevier
Yadollahzadeh, S.Aghbolaghi, R.Parvizi, R.
7页查看更多>>摘要：This work considered a two-dimensional hybrid organic-inorganic perovskite thin film with various thicknesses within a sandwiched structure of P3HT: PC61BM and PEDOT: PSS (the top and bottom sides). The optical absorption based on the method of attenuated total reflection was calculated. Then, a detailed primeval study on the lossy mode resonance (LMR) behavior of perovskite thin film as a refractive index sensor was theoretically investigated by defining surrounding media with various refractive indices ranging from 1.33 to 1.44. Since one of the efficient ways to improve the performance of the LMR sensor is optimizing the thickness of the lossy layer, herein, both polarization absorption spectra were studied. The results revealed that the transverse magnetic (TM) mode experienced more loss variation with exhibiting higher red-shift versus rather than transverse electric (TE) mode. The highest sensitivity of 3400 refractive index unit (RIU-1) was achieved; with such high sensitivity to the surrounding environment variations, the proposed structure indicates a versatile prospect. We believe that the perovskite-based LMR sensor can play an influential role in signal detection in biochemical sensors.
原文链接:- NSTL
- Elsevier
Ghosh, LabanyaGangwar, Vinod K.Singh, MahimaKumar, Satya Vijay...
8页查看更多>>摘要：In this report, we have investigated the Density functional theory (DFT) calculation, temperature-dependent thermoelectric power and Raman spectroscopy of Bi1.9Dy0.1Te3 topological insulator (TI). In this system, discrepancy due to the rare earth ion Dy initiates a Red-shift in Raman active modes in the Bi2Te3 TI. Here, the lattice thermal conductivity (kappa(L)) was evaluated in the Umklapp scattering limit using the temperature dependency of the vibrational phonon modes and was used to evaluate the Figure of merit (ZT) of the system. It has been demonstrated that the estimated Power factor and ZT is very large, confirming the efficiency of Bi1.9Dy0.1Te3 for better thermoelectric and electronic applications. Such immense thermoelectric power value of the corresponding system was further supported by the DFT calculation.
原文链接:- NSTL
- Elsevier
Jeyaseeli, A. JarletLatha, M. M.
9页查看更多>>摘要：Spin deviation vs site number in an inhomogeneous (site dependent) antiferromagnet incorporating next nearest neighbour (NNN) and Dzyaloshinski-Moriya (D-M) interactions along with nearest neighbour and anisotropic interactions is investigated. In this context, a model Hamiltonian for 1D inhomogeneous antiferromagnetic spin system with site dependent inhomogenities is constructed. Glauber coherent state representation along with H-P representation is applied to derive the Heisenberg equation of motion. The dynamics in the continuum level is investigated using the Sine-Cosine (SC) function method and the results are analysed graphically.
原文链接:- NSTL
- Elsevier
Patel, K. D.Solanki, G. K.Pathak, V. M.Jha, Prafulla K....
7页查看更多>>摘要：The work compares the dependency of temperature on the out of plane and in-plane Raman modes of DVT grown crystalline WSe2 with that of Co and Ni incorporated samples. The structural validations were recognized from their X-Ray diffractograms. The alteration in the mode positions reliant on temperature led to the deduction of first-order temperature coefficients in the range of 10-3 cm-1/K. The observed shift originates from the threephonon anharmonic process. The optothermal method, where the laser holds the role of a heat source in instigating a shift in the modes has also been documented, thermal conductivity of the materials has been deduced from the same.
原文链接:- NSTL
- Elsevier
