Application of precise integration in waveguide discontinuities with anisotropic dielectric
Multiband and broadband metamterial absorbers
Line focusing characteristics of axicon illuminated by non-diffracting Bessel beam
Experimental study on polarization-independent reflector structure based on magneto-optical crystal and two mirrors
Study on the characteristics of cosh-Gaussian vortex beams in the far field
Investigation of the ultrafast phase evolution of the ejected material generated during femtosecond laser ablation of aluminum by the coherent light illuminated schlieren apparatus
Eye gaze tracking based on dark pupil image
The accurate localization of iris center is difficult since the outer boundary of iris is often occluded significantly by the eyelids. In order to solve this problem, an infrared light source un-coaxial with the camera is used to produce dark pupil image for pupil center estimation. Firstly, the 3D position of the center of cornea curvature, which is used as translational movement information of eyeball, is computed using two cameras and the coordinates of two cornea reflections on the cameras' imaging planes. Then, the relative displacement of pupil center from the projection of the cornea curvature center on 2D image is extracted, describing the rotational movement of the eyeball. Finally, the feature vector is mapped into coordinates of gazing point on the screen using artificial neural network. As for the eye region detection problem, two wide-view webcams are used, and adaptive boosting+active appearance model algorithm is adopted to limit the region of interest within a small area. The result of our experiment shows that the average root-mean-square error is 0.62° in horizontal direction and 1.05° in vertical direction, which demonstrates the effectiveness of our solution in eye gaze tracking.
Ridgelet transform research based on the coordinate representation
Phonon effect on the quantum phase of a radiation field interacting with a tunneling-coupled quantum-dot molecule
Modified effective bandwidths of adaptive optical control systems for compensation in Kolmogorov turbulence
Tunable two-dimensional photonic crystal cavity all-optical switching infiltrated with liquid-crystal
Non-imaging secondary (NIS) for axial symmetrical two-stage optical concentrator
Experimental investigation of two-dimensional multi-point defect phononic crystals with square lattice
Low-frequency band gaps in phononic crystals with composite locally resonant structures
Study of resonance sound response for bubble cluster in ultrasonic field
Vibration of the bubble in bubbly liquids
Experimental investigations on coherent combination of high-power and high-intensity air-modulated speakers
Vibro-acoustic characteristics of shear deformable stiffened laminated panels in mean flow
Constructal entransy dissipation rate minimization of a disc on micro and nanoscales
Movement of a droplet on a structured substrate: A dissipative particle dynamics simulation study
Experimental study on the capillary flow in tubes of different shapes under microgravity condition
Constructal entransy dissipation rate minimization the problem of constracting “disc-point” cooling channels
The use of T-matrix method for determining coagulation rate of colloidal particles in light scattering measurement
Total ionizing dose effect on 0.18 μm narrow-channel NMOS transistors
Fracture behavior of TiN coating under nanoindentation and nanoscratch test
Crystallization behavior and thermal stability of Al-Ni-RE metallic glasses
Effect of magnetic field on growth of intermetallic compound layers in Fe-Fe50wt.%Si diffusion couple
First-priciples study on Mn-doped LiZnAs, a new diluted magnetic semiconductor
The electronic structures, half-metallic and optical properties, as well as formation energy of pure LiZnAs, Mn-doped LiZnAs and Mn-doped LiZnAs with excess and deficient of Li are geometrically optimized and calculated by using the first principle density functional theory based on the full potential linearized augumented plane wave method. Results show that in the systems of Li(Zn0.875Mn0.125)As, Li1.1(Zn0.875Mn0.125) As and Li0.9(Zn0.875Mn0.125)As a 100% spin injectors is revealed, and the materials exhibit half metallic. The half metallic materials with excess and deficient of Li are more stable than Mn-doped LiZnAs. Excess of Li could improve the Curie temperature and conductivity of the material, and cause the formation energy of the system decrease. So the separation of spin and charge injection mechanisms may be achieved in LiZnAs semiconductor, and the magnetic and electrical properties of diluted magnetic semiconductor may be regulated respectively by Mn doping and Li stoichiometry. In addition, the dielectric function and the complex refractive index function in the low-energy region are found to be influenced by the stoichiometry of Li.
Effect of oxygen on stability performance of the IZO junctionless thin film transistors
Study of the high hydrogen storage capacity on 2D Li+BC3 complex
Enhanced flux pinning in MOD-YBCO films with co-doping of BaCeO3 and Y2O3 nanoparitcles
Enhancing the critical-current density of YBCO films is essential to gain a deeper understanding of the vortex pinning mechanisms and enable commercial applications of high-temperature superconductivity. Combined BaCeO3 and Y2O3 nanoparticles have been achieved to be co-doped in YBa2Cu3O7-x (YBCO) films by metalorganic deposition using trifluoroacetates (TFA-MOD). The formation of integrated nanoparticles increases the critical current density (Jc) of Y2O3/BaCeO3 doped-YBCO films while keeping the critical transition temperature (Tc) close to that in the pure YBCO films. YBCO film containing BaCeO3 and Y2O3 showed Tc value of 91 K and Jc value of 5 MA/cm2 at self-field (0 T, 77 K). The strongly enhanced flux pinning over a wide range of magnetic field may be attributed to the combined BaCeO3 and Y2O3 created by optimized TFA-MOD conditions.
The research of the perpendicular magnetic anisotropy in CoFeB/AlOx/Ta and AlOx/CoFeB/Ta structures
The perpendicular magnetic anisotropy (PMA) of the CoFeB/AlOx/Ta structure and the AlOx/CoFeB/Ta structure with different thicknesses of both CoFeB and AlOx is studied. Magnetization curves show that the CoFeB/AlOx/Ta structure has a clear perpendicular magnetic easy axis while the AlOx/CoFeB/Ta structure does not. The cause of the asymmetrical phenomenon in the symmetric structures is analyzed. Dependence of the perpendicular coercivities on the thicknesses of CoFeB and AlOx shows that both of them can affect the strength of the PMA originating from the interfacial interaction. This work will be meaningful for the fabrication of the AlOx-based perpendicular magnetic tunnel junctions.
Raman spectra of monoand bi-layer graphenes with ion-induced defects-and its dispersive frequency on the excitation energy
Luminescent properties and energy transfer in Ca4Y6 (SiO4)6F2: Ce3+, Mn2+ phosphor
Growth and characterization of the Mg0.57Zn0.43O alloy film
We report the growth of single cubic phase Mg0.57Zn0.43O (MZO) alloy film through the method of metal organic chemical vapor deposition (MOCVD) and the relation between the quality and thermal stability of the alloy film after heat treatment. From X-ray measurement, we found that the quality of cubic MZO film was significantly influenced by the heating temperature. At 500-850℃, the crystallization and surface morphology of the alloy film were improved obviously as the temperature increased. Also, the blue shift of absorption cut-off edge, broadened band gap and maintained single cubic structure were found with increasing temperature. However, up to 950℃, mixed phases were formed in cubic MZO alloy film. For the photoresponse measurement of the MSM unit devices synthesized by the cubic MZO alloy film under 15 V bias, we found that the response peak of devices was around 260 nm, rejection ratio of UV/Vis was about 4 orders of magnitude, saturated responsibility was 3.8 mA/W and the value of dark current was about 5 pA.
The effect of pressure on thermal decomposition of solid nitromethane via MD simulation
Numerical optimization study of PIC/PSO for RBWO
Theoretical research and experimental verification for ocean surface wind vector retrieval from airborne C-band fully polarimetric SAR
Improving the mobility of the amorphous silicon TFT with the new stratified structure by PECVD
Logarithmic minus peak second derivative time based depth prediction
Influence of Al doping on stability of Mg1-xTix and their hydrides
Based on the density functional theory, influences of Al doping on stability and electronic structure of MgxTi1-x alloys and their hydrides were investigated. By calculating the formation energies of Mg-Ti-Al system, it is found that the best effect was obtained when the Ti-Al ratio was fixed at 1: 1, where the metal alloy was most stable, and was helpful to reversibly hydrogenate. Moreover, the partial substitution of Al for Ti atoms decreased the stability of the hydrides and improved the hydrogen storage properties. The analyses of the density of states, electron density and bond length showed that the improved properties of MgxTi1-x alloys and their hydrides with Al doping are due to the decrease in the number of bonding electrons and the weakening of Mg-H and Ti-H interactions in doped systems.
Node influence calculation mechanism based on Bayesian and semiring algebraic model in social networks
In social networks, many applications and spreading depend on the nodes with high influence to do viral marketing, which indicates that nodes' influence should be measured in a comprehensive and reasonable way. The appearance of fake fans results in change of network topology and brings new challenge to topology-based traditional methods. This paper incorporates both the network topology and interactions among nodes into our new distribution mechanism of node influence calculation in social networks. Considering the similarity of node behaviors in time domain and several key factors, this paper presents by a discounted Bayesian model for direct influence between nodes at first. Then a semi-ring-based aggregation implements for indirect influence and the composite influence are obtained by the combination of both direct and indirect influences. Simulation shows that this mechanism not only performs well against fake fans attack and restrains the fluctuation of nodes' influence, but also spreads to more nodes when we choose several nodes with high influence under our method to be source nodes.
Stability and bifurcation of epidemic spreading on adaptive network
Adaptive network is characterized by feedback loop between states of nodes and topology of the network. In this paper, for adaptive epidemic spreading model, epidemic spreading dynamics is studied by using a nonlinear differential dynamic system. The local stability and bifurcation behavior of the equilibrium in this network model are investigated and all kinds of bifurcation point formula are obtained by analyzing its corresponding characteristic equation of Jacobian matrix of the nonlinear system. It is shown that, when the epidemic threshold is less than epidemic persistence threshold R00c, the disease always dies out and the disease-free equilibrium is asymptotically locally stable. If R0c0<1, a backward bifurcation leading to bistability possibly occurs, and there are possibly three equilibria: a stable disease-free equilibrium, a larger stable endemic equilibrium, and a smaller unstable endemic equilibrium. If R0>1, the disease is uniformly persistent and only one endemic equilibrium is asymptotically locally stable. It is also found that the system has saddle-node bifurcation, transcritical bifurcation, and Hopf bifurcation. Numerical simulations are given to verify the results of theoretical analysis.
An algorithm of equivalent curcuit of FDTD and its application to designing metamaterial structure
Simulation of the projectile dynamics in granular media
Nonlinear intermodulation waves of large-scale shallow water equations
The dynamics of quantum correlation between two atoms in a damping Jaynes-Cummings model
Self-trapping and periodic modulation of beam propagation in semiconductor photorefractive medium
Quantum key distribution system based on combined modulation
The model design and performance analysis of quantum signaling switch
Quantum correlation for a central two-qubit system coupled to Ising chain
Error bases, group algebra and quantum codes
Landau damping and frequency-shift of monopole mode in an elongated-rubidium Bose-Einstein condensate
Self-trapping and periodic modulation of Fermi gases in optical lattices
Synchronization of chaotic systems with variable coefficients
Chaotic control of the Buck converter based on improving the correlation
Non-inductive modular circuit of dislocated synchronization of fractional-order Chua's system and its application
In this paper, from the stability theory of fractional-order chaotic system, a kind of dislocated projective synchronization for fractional-order Chua's system is successfully completed through a nonlinear controller. Meanwhile, the fractional-order unit circuit is designed, according to the series-parallel structure of resistor-capacitor and the approximate linear transfer function expression for the complex frequency domain. Thus, non-inductive modular circuit of dislocated projective synchronization of fractional-order Chua's system is realized. The circuit simulation results prove the feasibility of the scheme. Furthermore, the method can be applied in secure communication through the improved chaotic masking. The information signal can be concealed and recovered. Numerical simulation results show the effectiveness of the proposed method.
Study on partial discharge signal detection by coupled Duffing oscillators
A HSPICE model of carbon nanotube field effect transistor
In order to apply carbon nanotube field effect transistor (CNTFET) to circuit simulation, maintaining an acceptable accuracy while minimizing computation time is a major problem. To establish a simple and high accuracy CNTFET model in HSPICE, based on the semi-classical model of CNTFET, the relationship between self-consistent electric potential and carrier density is analyzed, linear approximation is used for curve fitting, and explicit expression of self-consistent electric potential is deduced, so that the iterative solution of an integral equation is avoided. Then the CNTFET model in HSPICE is built. Simulation demonstrates that the proposed model can maintain high accuracy, and the logic functions can be realized in corresponding logic gates built with the proposed model, while the computation time is significantly reduced.
Homoclinic orbits analysis of T chaotic system with periodic parametric perturbation
Temperature-insensitive magnetic-field measurement using all-fiber Sagnac interferometers
Thermally controlled terahertz metamaterial modulator based on phase transition of VO2 thin film
Measurement of atmospheric CO2 vertical column density using weighting function modified differential optical absorption spectroscopy
Effects of high pressure annealing technique on the structure, morphology and electric properties of 0.65PMN-0.35PT thin films
Thin films of 0.65PMN-0.35PT PMN=Pb (Mg1/3Nb2/3)O3 and PT=PbTiO3 with a thickness about 250 nm were prepared on LaNiO3/SiO2/Si substrates by radio frequency magnetron sputtering. The films were annealed using high pressure annealing (HPA) technique in oxygen atmosphere. Effect of HPA on the crystal structure, morphology and electrical properties of the films was studied. XRD patterns of the films indicated that PMN-PT films treated by HPA in oxygen atmosphere (annealing temperature 400℃) showed a pure perovskite phase, with highly (100) preferred orientation. The strong and sharp diffraction peak showed the better crystallization of PMN-PT thin films after HPA. SEM observations showed that a rod or bubble morphology was present on the films surface. Ferroelectric properties tests showed that the PMN-PT film annealed in oxygen atmosphere at a pressure of 4 MPa, and annealing time of 4 h had good ferroelectric properties, in which the remanent polarization (Pr) could reach 10.544 uC/cm2. The shape of electric hysteresis was better, but the leakage current was too large, which may be due to the microstructure of the films. Meanwhile, the dielectric tests indicated that PMN-PT thin films could show very good dielectric properties, and the dielectric constant (εr) could reach 913, and dielectric loss (tgδ) was very small, only 0.065.
A probable explanation on nuclear shape phase transition SU(3)–U(5)–SU(3) of the yrast-band structure in 182Os nucleus by potential energy surface
A model for rp-process within the (p,γ)-(γ,p) equilibrium approximation and its application
Many of the stable nuclei at the neutron-deficient side of the beta-stability valley cannot be synthesized in the neutron-capture processes. The origin of the so-called p-nuclei has been a long standing question in the nuclear astrophysics. The rapid-proton capture process (rp-process) proposed in the 1980s was one of the possible mechanisms to be responsible for some light p-nuclei. In this work, a model for rapid-proton capture process (rp-process), within the (p,γ)-(γ,p) equilibrium approximation, is established. In the framework of this model, the influence of astrophysical conditions (i.e., proton number density, temperature, and proton irradiation time) on the rp-abundance pattern is investigated. In addition, the recent-measured mass data of neutron-deficient atomic nuclei by using the storage ring mass spectrometry at IMP, Lanzhou, are employed in our calculation. It is found that the abundance at A=41 is increased by two orders of magnitude when using the new by determined mass of 41Ti, while the uncertainty of the computed abundance is reduced by almost two orders of magnitude.
Study on the sensitivity of laser-pumped cesium atomic magnetometer
Site-preference of Mo/Ta/W alloying additions in NixAl1-x(x=0.25,0.5,0.75)
The equivalent diameter of conical nozzle in Hagena scaling laws
Study of plasmonic nanolaser based on the deep subwavelength scale
Numerical studies on intense laser-generated relativistic high-energy electrons via a thin cone target
An experimental attempt to produce Thomson scattering with soft X-ray lasers
Experimental study on asymmetrical period-one discharge in dielectric barrier discharge in helium at atmospheric pressure
Wavefield propagation characteristics in fracture-induced TTI double-porosity medium
The direction of symmetry axis of parallel fracture set in fractured hydrocarbon reservoir affects the transmission of seismic waves markedly, so a medium named fracture-induced TTI (tilted transverse isotropy) double-porosity medium is studied here to discuss the effect of different dip and azimuth angles of a fracture system. Based on the theories of fracture-induced HTI (horizental transverse isotropy) double-porosity medium, the softness and dispersion matrixes of fracture-induced TTI double-porosity medium are derived with the application of Bond transform, and finally, single-order velocity-stress equations are obtained. Furthermore, numerical simulations in xoz plane of 2.5 dimensional vector wavefield are carried out by the method of high-order staggered-grid finite-difference under perfect matched layer (PML) boundary conditions. The results show that the dipand azimuth angles of fractures have great impacts on seismic wave propagation, since the angles can cause the phenomena of shear wave splitting and, in the two-layer model of fracture-induced TTI double-porosity, converted shear wave splitting and shear wave sub-splitting. All of these increase the complexity of seismic wavefield and will lay a foundation of further studies on seismic wave propagation in actual earth layers.
A theory of 3-4-5-wave resonance and conservation for ocean surface waves
Warming and drying climate over Loess plateau area in China and its effect on land surface energy exchange
Spatiotemporal evolution of the droughts and floods over China
Timing equation in X-ray pulsar autonomous navigation
Pulsar signal detection based on S-transform