Simulation of marine controlled-source electromagnetic response in horizontally layered transversely isotropic formation by using improved transmission line method
Parametric excitation and stability of crystalline undulator radiation
Optical transfer function of coherent field imaging based on deviation of receptors
Experimental study on coherent beam combination of fiber amplifiers using adaptive power-in-the-bucket cost function Hot!
Beam combination (BC) of fiber amplifiers based on master-oscillator-power-amplifier configuration is an outstanding way to generate high power and high beam quality laser output, where the tip/tilt aberrations among beamlets are considered as a serious influence factor to BC effects. In this paper, a new tip/tilt control method based on adaptive power-in-the-bucket (PIB) cost function is proposed to solve the problem of restricted tip/tilt correcting value in current BC systems. Experimental setup of coherent BC of two-channel 2 W fiber amplifier array is established. Home-made piezoelectric-ring fiber-optic phase-modulator and adaptive fiber-optics collimator are employed to correct piston-and tip/tilt-type aberrations, respectively. The feasibility of proposed tip/tilt control method using adaptive-PIB is demonstrated and nice effect of coherent BC is achieved.
Investigation on coherence characteristics of Gauss-Schell model beam propagating in atmospheric turbulence
Full-field detection of polarization state based on multiplexing digital holography
Electromagnetically induced grating based on the coherent population trapping
Study of CO2 spectroscopic parameters at high temperature near 2.0 μm
Study of cascaded raman scattering laser in silica microsphere pumped by 976 nm laser
Influences of correlated colored-noises on logistic model for tree growth
Theoretical and visualization study of laserinduced surface acoustic wave on annular stator
Optical single sideband modulation with continuously tunable optical carrier-to-sideband ratio by employing a dual-parallel Mach-Zehnder modulator
Study on the emission spectrum of AlO radical B2∑+–X2∑+ transition using laser-induced breakdown spectroscopy
Based on laser-induced breakdown spectroscopy, a short pulse laser is used to excite Al2O3 (content of 99%) ceramic to produce ceramic plasma. The plasma emission spectrum is collected, and 33 spectral lines of AlO radical B2∑+–X2∑+ transition are obtained. The time-resolved AlO radical spectrum and its relationship with laser pulse energy are investigated. The results show that the emission spectrum of AlO radical appears later and lasts longer than those of Al atom and Al ion. With the increase of the laser pulse energy, the spectral intensity of AlO radical decreases and the time when the maximum spectral intensity appears moves backward. Finally, the ceramic plasma produced in air is compared with that produced in Ar environment. The results prove that the formation of AlO radical spectrum has an important relationship with O2 in air.
Research on bionic underwater acoustic communication technology based on differential Pattern time delay shift coding and dolphin whistles
Orthogonal multicarrier M-ary cycle shift keying spread spectrum underwater acoustic communication
A rapid inversion scheme for seabed single parameter using time-domain impulse response
Numerical study of collision process between two equal diameter liquid micro-droplets using a modified smoothed particle hydrodynamics method
Study on continuous vortices induced by sub-microsecond pulsed surface dielectric barrier discharge plasma
Influence of gas bubbles in valve-less micropump chamber on periodic driving pressure
Diffusion of order reconstruction induced by –1/2 wedge disclination in a thin hybrid nematic liquid-crystal cell
Based on the Landau-de Gennes theory, the diffusion of order reconstruction induced by –1/2 wedge disclination in a thin hybrid cell is investigated by the relaxation iterative method. The core structure, the biaxial structure, and the diffusion of order reconstruction as the cell thickness decreases, are explored. The defect structure and the range of order reconstruction do not change when the cell thickness is larger than 15ξ. As the thickness decreases from 15ξ, the defect range broadens along the substrate direction, and the biaxial region as well as the range of order reconstruction also enlarges. When the thickness further decreases to below the critical value of 10ξ, the biaxial region and the order reconstruction range merge into an entire cell, where the planar orientation is abruptly converted into the perpendicular one across the biaxial wall. The results obtained in this paper are important for further studying the regulating effect of topological defect on submicron colloidal particles in nematics.
Thermal conductivity of carbon nanotube cable type composite Hot!
For single-wall carbon nanotubes filled with gold nanowires, a kind of carbon nanotube cable type composite material, its thermal conductivity is simulated by non-equilibrium molecular dynamics method. The Tersoff potential is employed for C-C bonding interactions, the Lennard-Jones potential for C-Au interactions and the embedded atom method potential for Au-Au interactions. It turns out that the electronic thermal conductivity (ETC) of gold nanowire is much lower than that of the composite with the same size, so the ETC of metal nanowire could be ignored. The carbon atoms tend to vibrate along the axial direction of the tube because of the interaction between gold and carbon atoms. Furthermore, the umklapp scatterings among phonons are reduced and the phonon mean free path is increased. Therefore, the thermal conductivity of the composite is 20%–45% higher than the bare carbon nanotubes in a temperature range of 100–500 K, but the growth rate decreases with the rise of temperature. The thermal conductivity of the composite rises with the increasing of length but in a sharper rate, and decreases with the increasing of diameter in the same rate, which is similar to the bare carbon nanotubes.
The effects of precipitant on the defect structures and properties of ZnO varistor ceramics
Experimental study of the spatial discontinuity of dynamic damage evolution
Electron-LO phonon scattering in Ga1-xInxNyAs1-y/GaAs quantum well
Thermodynamic study on two-step desorption of oxides on InAs(001) surface
Magnetic properties of multiferroic material DyMnO3 in orthorhombic structure
Properties in vanadium dioxide thin film synthesized from V2O5 annealed in H2/Ar ambience
The effect of additional permanent magnet magnetizing methods on magnetic field distribution and the levitation force of single domain GdBCO bulk superconductor
Effects of high magnetic field on the microstructure and magnetic properties of Fe80Ni20 thin films with different thickness values
Micromagnetic analysis of the effect of the easy axis orientation on demagnetization process in Nd2Fe14B/α-Fe bilayers
Transmission and application of electron spin wave function in alternating ferromagnetic and nonmagnetic layers
Molecular dynamics simulation of low-energy hydrogen atoms bombarding tungsten (001) surface at different angles and their depth distribution
Numerical simulation of coupled arc in double electrode tungsten inert gas welding
Uni-traveling-carrier double heterojunction phototransistor photodetector
SPICE simulation of organic resistive memory with structure of ITO/polymethylmethacrylate/Al
The study of conserved quantities and symmetries for two-dimensional isotropic harmonic charged oscillator moving in homogeneous magnetic field
The first order approximate Lie symmetries and approximate conserved quantities of the weak nonlinear coupled two-dimensional system
Properties of entanglement in one-dimensional Ising model with a tilted magnetic field
Entanglement properties of two atoms interacting with weak coherent states trapped in two distant cavities connected by an optical fiber
Chaos analysis of the rational Bézier biquadratic surface in the unit area
Mechanism of bursting oscillations in non-smooth generalized Chua’s circuit with two time scales
Complex Turing patterns in two-layer non-linearly coupling reaction diffusion systems
Effect of ion channel random blocking on the spatiotemporal dynamics of neuronal network
Characteristics of time-delay complex Lorenz chaotic system and its self-synchronization of time delay
A weighted scale-free network model with high clustering and its synchronizability
All optical quartz-enhanced photoacoustic spectroscopy
Data inversion technique for single Fabry-Perot etalon-based dual-frequency Doppler lidar
Optical detection sensitivity of area light source in optical read-out IR imaging
Performance evolution process of machined surface of monocrystalline silicon micro/nanostructures
Shielding property calculation of B4C/Al composites for spent fuel transportation and storge
Study of nuclear stopping in Au+Au collisions at alternating gradient synchrotron energies by the ultra-relativistic quantum molecular dynamic model
Establishment of persistent fission chains in a super prompt critical system
Theoretical study of adsorption of propanethiol on Au(111) surface at different coverages
Molecular structure and electronic spectrum of 2, 2’, 5, 5’-tetrachlorobiphenyl under the extenal electric field
Polychlorinated biphenyls (PCBs) are persistent organic pollutant, and 2, 2’, 5, 5’-tetrachlorobiphenyl is generally used as a model molecule of PCBs in some studies. PCB52 molecule is degraded under external electric fields. The molecular structure of PCB ground state is optimized by density functional theory (B3LYP) method with 6-311+g(d) basis sets. The effects of electric fields ranging from-0.04 a.u. to 0.04 a.u. are investigated on structural parameters, total energy, dipole moment and charges distribution. The transition wavelengths, oscillator strengths and excitation energies of the first six excited states under external electric fields are calculated by the time dependent density functional theory method. The result shows that the bond lengths of 1C–21Cl and 14C–20Cl increase with external electric field increasing. The dihedral angle of two benzene rings of PCB52 molecule increases under the electric fields, and the PCB52 molecule reduces toxicity. PCB52 molecule energy gaps decrease, leading to the fact that the molecule is susceptible to excitation to an excited state and reductive dechlorination reaction. As the increase of the applied electric field, the excitation energies rapidly decrease, absorption wavelengths are red-shifted toward longer wavelength and oscillator strength is no longer zero, which indicates that the PCB52 molecule is easily excited and dissociated.
Precise measurements of rotational constants of the pure long range state of ultracold cesium molecules Hot!
The high resolution spectrum of ultracold Cs2 pure long range 0g- state is experimentally measured using modulated trap loss spectroscopic technology. Based on Double photoassociation spectroscopic technique, precise frequency difference reference signals are constructed to accurately calibrate the resonant frequency intervals of the ro-vibrational levels, thus obtaining the relationship between the frequency interval of rotational level and the rotational quantum number. The experimental data are fitted by the non-rigid rotational model, and the molecular rotational constants corresponding to different vibrational levels in the ultracold Cs2 pure long range 0g- state are acquired. The experimental results demonstrate a linear decrease of the rotational constant with the increase of vibrational quantum number, and the linear decreasing rate is -0.41m MHz±0.01 MHz.
Research on proton-impact excitation process of hydrogen atom in Debye plasma
A study of dynamic properties of exchange reaction H(D)+SH/SD by quasi-classical trajectory method
Modeling and experimental study of the mechanism of electrification from aero-engine jet
Nonlinear Ramsey interference with Gaussian pulse
Absolute measurement of pulsed radiation imaging
Variations of implosion asymmetry with hohlraum length and time in indirect-drive inertial confinement fusion
The classification of winter regional extreme low temperature events in China and their corresponding relationship to climatic indices extreme anomaly
Physical process and characteristics for rapid charging events at international space station
Theory of ELF/VLF wave directional radiation by modulated heating of ionosphere
Research of small space debris impact induced discharge