Novel composite right/left-handed transmission line and its application to filter design
Cross-polarizaton characteristics in spin Hall effect of light
Two kinds of optical pulse compression approaches based on cross phase modulation
Multi-spectral and panchromatic image fusion based on HIS-wavelet transform and MOPSO algorithm
A novel simple fiber nonlinearity suppression method in fiber-optic transmission systems using an all optical phase pre-emphasis
In this paper we propose, simulate and experimentally verify a novel and simple optical phase pre-emphasis method, which is capable of mitigating fiber nonlinearity in dense wavelength division mult-DWDM optical translation systems. In our simple method, each transmitted wavelength is modulated by a phase modulator driven by a periodic parabolic electric driving signal. Both of the simulations and experimental results verify that the proposed method can effectively mitigate the fiber Kerr nonlinearity.
Pair coherent state evolutions through parametric frequency conversion and the realization of quantized vortex states
The theoretical study on abnormal experimental phenomenon of the elongated rod Nd:glass pulsed laser
According to the principle of laser and a large number of experimental data proved and also considering the influence of the ignored spontaneous emisson, we study the abnormal phenomenon that the Nd: glass rod which was longer than the optical pump cavity is optically amplified without pumping. The theoretical result is almost the same as experimental result.
The absorption spectrum study of the (4, 0) band in the b4Σ--a4Πi system of NO
The gain spectrum character under Raman scattering and parametric amplification
Simulation of photonic crystal fiber with three and four zero-dispersion wavelengths
Influence analysis of saturation effect of microchannel plate on dynamic range of streak cameras
The streak cameras which with an internal or external microchannel plate (MCP) image amplification has a significant enhancement on the detect signal threshold, but also induces the saturation effect of MCP to limit the dynamic range of streak camera. The saturation effect of MCP is described through the channel multiplier model of a discrete resistance capacitance dynode chain, explaining that the input output linear range of MCP which in both the two amplification method is depend on the charge restored in the channels the contribution of compensate effect which comes from the bias current is very limited, even using a low restistance MCP in the external method streak camera, so the streak cameras with an internal and external MCP image amplification should have equivalent dynamic range, low resistance MCP only function if a rapid sequence shots is required, and MCP gain was set up properly is critical for the dynamic range of streak camera.
Generation of photonic microwave based on the period-one oscillation of an optically injected semiconductor lasers and all-optical linewidth narrowing
Investigation of one-dimensional finite phononic crystal with exponential section
Calculations of radiation impedance of a rectangular plate with flexural vibration
Forced oscillations of gaseous bubbles in microtubules
Lyapunov-Schmidt reduction and singularity analysis of a high-dimensional relative-rotation nonlinear dynamical system
Research on the dynamics of indoor pedestrian evacuation via game
Study of periodic dispersive structures using splitfield FDTD method
Mechanism analysis of one-dimensional short groove quasicrystal structure drag-reduction
Tunable negative refraction properties of photonic crystals based on silicon columns arranged in magnetic liquids
Microstructure of spray-formed superalloy FGH4095
Spray-forming technology can produce billets with similar microstructure and higher productivity compared with the P/M process. The nickel based superalloy FGH4095 billet was produced by spray-forming with nitrogen as atomization gas. The pressure of the atomization gas and the temperature of the deposit zone were recorded. The compactness of the deposit was characterized by quantitative metallography and Archimedes method. The grain structure of γ substrate and the size and morphology of γ ' phase were observed. Results show that the density of the deposit produced by nitrogen spray forming reaches about 99% and little amount of pores with diameters about 1—2 μm could be detected in the deposit matrix. While, pores could be enclosed by HIP and near iso-thermal forging process; Nitrogen was existed as carbonitride with diameters less than 1 μm. The average grain size of the equiaxed grains in the interior of the deposit is about 20—40 μm, while the grains near the surface of the deposit are finer with average grain size about 13um; the primary γ' phase which has diameters about 0.3—0.5 μm possesses irregular block feature. The microstructure of the spray deposit is related to the temperature history of the alloy during the spray forming process.
The effects of different particle size Y2Ba4CuBiOy nanoparticles doped on the properties of single domain YBCO bulk superconductors by TSIG process
Analytical model of single event crosstalk in near space
The structural transition of water at quartz/water interfaces under shock compression in phase region of liquid
Plastic behavior of Zr51Ti5Ni10Cu25Al9 metallic glass under planar shock loading
Planar shock compression experiments are performed on a Zr-based bulk metallic glass (BMG), Zr51Ti5Ni10Cu25Al9 at peak shock stresses from 10 GPa to 27 GPa to investigate its plastic behavior under high pressure and high strain-rate. The particle velocity profiles measured at the free surface of the samples are analyzed to estimate longitudinal stresses of the Zr-based BMG in the shock loading process,and then shear stresses are obtained by comparing longitudinal stresses with a hydrostat. Though there is an obvious relaxation effect after elastic front, the Hugoniot elastic limit of the Zr-based BMG is found to increase with shock stress increasing. However, the shear stresses across the plastic shock front display stress hardening above the Hugoniot elastic limit followed by a stress relaxation (softening) to Hugoniot state, and the relaxation level also increases with shock stress increasing. The changes of shear stresses under planar shock compression are consistent with the results from molecular dynamic simulations, but obviously different from the pressure-shear impact experimental results or uniaxial stress impact experimental results.
Effect of 4 GPa pressure treatment on the solid state transformation kinetics of T8 steel in heating process
The transformation temperatures and durations of solid state transformation in T8 steel before and after 4 GPa pressure treatment are measured using differential scanning calorimetry, and the transformation activation energy and Avrami exponent are also calculate. Then the effects of 4 GPa pressure treatment on solid state transformation kinetics in T8 Steel are investigated based on the kinetic parameters and the observation of microstructure. The results show that the solid state transformation in T8 steel shifts toward the low temperature region after 4 GPa pressure treatment. The high pressure treatment can reduce the phase transformation time and Avrami exponent and enhance the phase transformation activation energy, which is favorable for refining the grains but has little effect on the phase transformation mechanism.
Large partial band-gaps for Lamb waves in multiple phononic crystals thin plates
The effects of spinodal decomposition and nucleation on phase separation
First-principles calculations of optical and mechanical properties of LiBX2 (B= Ga, In; X= S, Se, Te)
First-principles study on the electronic structure and phase transition of α-, β- and γ-Si3N4
Junctionless low-voltage thin-film transistors based on indium-tin-oxide
Nonlinear Ramsey interference of Fermi superfluid gases in unitarity regime
The effects of Ti ion-irradiation on critical current and flux pinning in MgB2 thin film
High-quality MgB2 films are fabricated via hybrid physical-chemical vapor deposition (HPCVD) and irradiated by Ti ions. Compared with the unirradiated film, the Ti-irradiated MgB2 film shows a high critical current density (Jc) in magnetic field and also a high upper critical field (Hc2), while the superconducting transition temperature (Tc) does not decrease significantly. The Ti-irradiated film with a best fluence at 1× 1013/cm2 shows a high Jc of 1.72× 105 A/cm2 in 4 T perpendicular field at a temperature of 5 K and a moderately decreased Tc at 39.9 K.
Research on the electromagnetic properties of nano-fiber coating absorbent
Electrochemical method is used to fabricate nano-fiber coating absorbent. The effect of the fiber length on electromagnetic property is analyzed. Radar absorbing coating is prepared preferentially. The measurements show that nano-fiber coating absorbent has good absorbing properties.
Phenomenological analysis for dielectric dispersion of donor doped barium titanate based relaxor ferroelectric
Effect of oxygen content on giant dielectric constant and dielectric process in CaCu3Ti4O12
Preparation and performances of KNN-based lead-free transparent ceramics
Using conventional solid-phase sintering technique combined with a special atmosphere controlling technique, KNN-based lead-free transparent ceramics, xBa(Sc0.5Nb0.5)O3-(1-x) (K0.5N0.5)NbO3 (xBSN-(1-x) KNN), are prepared and investigated. Their microstructure, dielectric performance, ferroelectric performance and optical transparency are investigated. The results show that such ceramics are each with a pseudocubic-Perovskite structure, without any other impure phase. Their grain size is comparable to the light wavelength and the grains are highly condensed without evident crystal borders. For x=0.05, the d33 reaches up to 110 pC/N maximally and the 2Pr =25.4 μC/cm2. Moreover, such ceramics are each with an excellent transparency. Their optical transparency reaches about 54%, In the near-infrared wavelength 2500 nm, their optical transparency is near 83%. Such ceramics are a type of environment-friendly lead-free transparent ceramics which may be promising in replacing lead-based transparent ceramics.
Ultrafast carrier dynamics in CdTe/CdS Core/Shell quantum dots
Investigation of thermodynamic progress of silicon ablated by nanosecond uv repetitive pulse laser
Effect of annealing on crystalline property of poly-Si thin-film by Ge-induce crystallization
Preparation and structure of CuInS2 film by the direct current triode sputtering
Effects of pulsed magnetic field on Mn-doped ZnO diluted magnetic semiconductor prepared by hydrothermal method
In this study, zinc acetate, manganese acetate, ammonium hydroxide and ammonium chloride are used as the source materials to prepare crystalline Mn-doped ZnO diluted magnetic semiconductor by hydrothermal method under a 4 T pulsed magnetic field. The microstructures, morphologies and magnetic properties of the samples are characterized by X-ray diffraction, scanning electron microscope, transmission electron microscope, Raman scattering spectra, Photoluminescnce and vibrating sample magnetometer. The effect of pulsed magnetic field on the microstructure and magnetic property of the Mn-doped ZnO diluted magnetic semiconductor are discussed. The result indicates that all the samples are still of hexagonal wurtzite structure. The pulsed magnetic field promotes the crystal growth, and improves room temperature ferromagnetism. The saturation magnetization (0.028 emu/g) of the sample fabricated under 4 T pulsed magnetic field is more than two times that of the sample synthesized without pulsed magnetic field. The Curie temperature (Tc) of the Mn-doped ZnO increases 15 K through the pulsed magnetic field processing.
Effect of electromigration on interfacial reaction in Ni/Sn3.0Ag0.5Cu/Au/Pd/Ni-P flip chip solder joints
A big cluster model of the PER-TIM interval timer in drosophila cytoplasm for the circadian clock
Research on sodium incorporation methods of growing Cu(In-Ga)Se2 thin film by low-temperature deposition
Sodium is proved to be able to improve the performance of Cu(In,Ga)Se2 solar cell grown on flexible polyimide substrate by a low-temperature deposition. Different sodium incorporation methods affect the film in different ways. Comparing the deposition of a NaF precursor with post deposition NaF treatment, different mechanisms can be found. In NaF precursor approach, Na is available during the Cu(In,Ga)Se2 growth and acts as a surfactant at the grain boundary which adds up an energy barrier for adatom to across. Thus, a small grain size as well as double-peak reflection pattern can be observed and the formation probability of donor defects is reduced. In post deposition NaF treatment, incorporation of NaF does not affect the growth and microstructure but passivates donor defects in the Cu(In,Ga)Se2 film. Moreover, according to the experimental results, external energy assistance is necessary during NaF incorporation through post deposition treatment. It is verified that Na incorporation is able to improve the properties of the film effectively when substrate temperature reaches above 350 ℃. Finally, the conversion efficiency of flexible Cu(In,Ga)Se2 thin film solar cell on polyimide substrate is achieved to be 10.4% by optimizing the sodium incorporation.
Evaluating complex network functional robustness by node efficiency
High-oder symplectic FDTD scheme for solving time-dependent Schrödinger equation
Using three-order symplectic integrators and fourth-order collocated spatial differences, a high-order symplectic finite-difference time-domain (SFDTD(3, 4)) scheme is proposed to solve the time-dependent Schrödinger equation. First, high-order symplectic framework for discretizing the Schrödinger equation is described. The numerical stability and dispersion analyses are provided for the FDTD(2, 2), FDTD(2, 4) and SFDTD(3, 4) schemes. The results are demonstrated in terms of theoretical analyses and numerical simulations. The spatial high-order collocated difference reduces the stability that can be improved by the high-order symplectic integrators. The SFDTD(3, 4) scheme and FDTD(2, 4) approach show better numerical dispersion than the traditional FDTD(2, 2) method. The simulation results of a two-dimensional quantum well and harmonic oscillator strongly confirm the advantages of the SFDTD(3, 4) scheme over the traditional FDTD(2, 2) method and other high-order approaches. The explicit SFDTD(3, 4) scheme, which is high-order-accurate and energy-conserving, is well suited for long-term simulation.
A finite volume algorithm for solving nonlinear standing waves in acoustic resonators
Eliminate spiral wave and spatiotemporal chaos by using short-term cardiac memory
Fractional differentiability of the non-smooth heat curve
Piecewise fractional Brownian motion for modeling sea clutter
Chaotic impulse synchronization of opto-electronic feedback
Anti-control and circuit implementation of discrete-time systems under limited regional conditions
Heart rate variability analysis based on modified Poincaré plot
Chaotic characteristics analysis and prediction model study on wind power time series
Rational solutions and spatial solitons for the (2+1)-dimensional nonlinear Schrödinger equation with distributed coefficients
The nonlinear Schrödinger equation is one of the most important nonlinear models with widely applications in physics. Based on a similarity transformation, the (2+1)-dimensional nonlinear Schrödinger equation with distributed coefficients is transformed into a traceable nonlinear Schrödinger equation, and then two types of rational solutions and several spatial solitons are derived.
Opinion formation on the social networks with geographic structure
Analysis on topological properties of Beijing urban public transit based on complex network theory
Method of identifying the relative position between standing wave of laser light and substrate in atom lithography
Structural modeling of 128× 128 InSb focal plane array detector
Scintillating properties of Ce3+-doped high density oxide glasses
The study of dielectronic recombination (DR) rate coefficient for ground state of Ne-like isoelectronic sequence ions
First-principles study on the electronic and optical property of C-Zn co-doped anatase TiO2
Multiple ionization effect of Ta induced by heavy ions
The M X-ray spectra of Ta induced by H+, He2+, Ar11+ and Xe20+ are measured in Heavy Ion Research Facility in Lanzhou. The intensities of Mγ (M3N5) and Nαβ (M4,5N6,7), i.e. Iγ and Iαβ, are also derived from the spectra. It is found that the intensity ratio of Iγ/Iαβ increases with the increase of projectile atomic number. The results show that the M3-subshell fluorescence yield ω3 of Ta target is greatly enhanced, owing to multiple ionization effect in collision with heavy ions.
Calibration of velocity map imaging system and photodissociation dynamics of 1, 4-C4H8BrCl
Depletion of atmospheric ozone layers is more and more serious. Alkyl halides dissociate under the solar UV radiation with the product of free halogen atoms, which greatly damages the ozone layer and is the main culprit for the depletion of ozone layers. In this paper, methyl iodide is chosen as a calibration system of velocity map imaging. Velocity map images of iodine atom I (2P3/2) at different focus voltages are obtained in the dissociation of methyl iodine under an UV radiation of ～266 nm by techniques of velocity map imaging and REMPI (Resonance Enhanced Multiphoton Ionization). The magnification factor N of velocity map imaging system is measured to be 1.13. Photodissociation dynamics of 1, 4-C4H8BrCl under an UV radiation of ～234 nm is investigated on this velocity map imaging system. The speed and angular distributions of the fragments Br(2P3/2) and Br* (2P1/2) atoms in the dissociation are obtained and analyzed. Experimental results suggest that the dissociation of 1, 4-C4H8BrCl to both Br(2P3/2) and Br* (2P1/2) atoms under an UV radiation of ～234 nm happens promptly along the C-Br bond via repulsive surfaces after excitation. The anisotropy coefficient β values are obtained from angular distributions of imaging of the fragments Br (2P3/2) and Br* (2P1/2) atoms, by which the ratio between perpendicular transition and parallel transition for those two dissociation channels are calculated. In addition, photodissociation mechanisms of CH2BrCl, 1, 2-C2H4BrCl, 1, 3-C3H6BrCl and 1, 4-C4H8BrCl at an UV radiation of ～234 nm are compared, and the dependences of dissociation mechanisms of dihalogen alkyl compounds on size of the alkyl radical are obtained.
Coherence effect of high excited state atoms
The magnetic and quantum transport properties of sandwich-structured Tan(B3N3H6)n+1 clusters
A U-shape plasma antenna based on excitation of 5—20 kHz alternating current power supply
Atmospheric pressure streamer and glow-discharge generated alternately by pin-to-plane dielectric barrier discharge in air
Calculation of two-temperature transport coefficients of helium plasma
Effect of cooling rate on layering ICF cryogenic ice characterized by backlit shadowgraphy
Implosion characteristics of conical wirearray Z pinches on "Qiangguang1" facility
Implosion and radiation characteristics of conical wire array in different regimes of implosion are investigated at the 1 MA Qiangguang-1 facility by X-ray self-emission diagnostics. Experimental results show that the shape of precursor plasma is also conical. The initial implosion takes place near the cathode by a stronger Lorenz force, forming a triangle-like structure that produces harder X ray. The current crossing the bubble in the front of the wire array near the anode persists in persist ablating, thereby leading to a zippered stagnation. The initial implosion of a bubble near the cathode is followed by the implosion zippering upwards as the zipper implosion speed is 2.59× 107 cm/s. The results shows that the conical array has a broader X-ray power pulse than cylinderical wire array due to the zippered stagnation and zippered implosion of the array. The study of implosion characteristics of specialized axis symmetric wire array Z-pinch-like conical wire array can provide a valuable test bed for understanding the regime of implosion as well as theoretical model and magneto-hydrodynamic (MHD) codes, both of which primarily develop for the modeling of cylindrical wire array Z pinches.
Mode transition of inductively coupled plasma in interlayer chamber
Experimental sduty of current distribution in wirearray Zpinch plasma
Experimental and theoretical studies on gas discharge and plasma oscillation at atmospheric pressure
The gas discharge and plasma oscillation between the electrodes of high-voltage alternating current arc generator are studied, and the nanosecond pulsed phenomenon in the gas discharge process is observed at atmospheric pressure. Electron accumulation phenomenon under the action of alternating electric field is described by using a δ function. Based on the equation of electron fluid motion and Maxwell equations, the discharge voltage between the electrodes is depicted theortically. Theoretical and experimental results are consistent with each other basically, and the electron density is estimated to be 1.3× 1012/m3.
A mechanism analysis of the interdecadal precipitation change in Northwestern China for the last 30 years of twentieth century
Processing of GPS/LEO radio occultation recorded in open-loop mode
Predictability-based extended-range ensemble prediction method and numerical experiments
Raytracing of extreamely low frequency waves radiated from ionospheric artificial modulation at low latitude