Soliton-cnoidal interactional wave solutions for the reduced Maxwell-Bloch equations
A local energy-preserving scheme for Zakharov system
Energy states of the Hulthen plus Coulomb-like potential with position-dependent mass function in external magnetic fields
We need to solve a suitable exponential form of the position-dependent mass (PDM) Schrödinger equation with a charged particle placed in the Hulthen plus Coulomb-like potential field and under the actions of the external magnetic and Aharonov-Bohm (AB) flux fields. The bound state energies and their corresponding wave functions are calculated for the spatially-dependent mass distribution function of interest in physics. A few plots of some numerical results with respect to the energy are shown.
Arbitrated quantum signature scheme with continuous-variable squeezed vacuum states Hot!
We propose an arbitrated quantum signature (AQS) scheme with continuous variable (CV) squeezed vacuum states, which requires three parties, i.e., the signer Alice, the verifier Bob and the arbitrator Charlie trusted by Alice and Bob, and three phases consisting of the initial phase, the signature phase and the verification phase. We evaluate and compare the original state and the teleported state by using the fidelity and the beam splitter (BS) strategy. The security is ensured by the CV-based quantum key distribution (CV-QKD) and quantum teleportation of squeezed states. Security analyses show that the generated signature can be neither disavowed by the signer and the receiver nor counterfeited by anyone with the shared keys. Furthermore, the scheme can also detect other manners of potential attack although they may be successful. Also, the integrality and authenticity of the transmitted messages can be guaranteed. Compared to the signature scheme of CV-based coherent states, our scheme has better encoding efficiency and performance. It is a potential high-speed quantum signature scheme with high repetition rate and detection efficiency which can be achieved by using the standard off-the-shelf components when compared to the discrete-variable (DV) quantum signature scheme.
Detecting high-dimensional multipartite entanglement via some classes of measurements
Mutually unbiased bases, mutually unbiased measurements and general symmetric informationally complete measurements are three related concepts in quantum information theory. We investigate multipartite systems using these notions and present some criteria detecting entanglement of arbitrary high dimensional multi-qudit systems and multipartite systems of subsystems with different dimensions. It is proved that these criteria can detect the k-nonseparability (k is even) of multipartite qudit systems and arbitrary high dimensional multipartite systems of m subsystems with different dimensions. We show that they are more efficient and wider of application range than the previous ones. They provide experimental implementation in detecting entanglement without full quantum state tomography.
Destroying MTZ black holes with test particles
Current loss of magnetically insulated coaxial diode with cathode negative ion
Generalized Chaplygin equations for nonholonomic systems on time scales
Performance study of aluminum shielded room for ultra-low-field magnetic resonance imaging based on SQUID: Simulations and experiments
Optimizing the atom types of proteins through iterative knowledge-based potentials
Thin film dynamics in coating problems using Onsager principle
Capillary filling in closed-end nanotubes
Computational mechanistic investigation of radiation damage of adenine induced by hydroxyl radicals
Monitoring the formation of oil-water emulsions with a fast spatially resolved NMR spectroscopy method
In the present study, a fast chemical shift imaging (CSI) method has been used to dynamically monitor the formation of oil-water emulsions and the phase separation process of the emulsion phase from the excessive water or oil phase on the molecular level. With signals sampled from series of small voxels simultaneously within a few seconds, high-resolution one-dimensional (1D) 1H nuclear magnetic resonance (NMR) spectra from different spatial positions for inhomogeneous emulsion systems induced by susceptibility differences among components can be obtained independently. On the basis of integrals from these 1H NMR spectra, profiles obtained explicitly demonstrate the spatial and temporal variations of oil concentrations. Furthermore, the phase separation time and the length of the oil-water emulsion phase are determined. In addition, effects of oil types and proportions of the emulsifier on the emulsification states are also inspected. Experimental results indicate that 1D PHASICS (Partial Homogeneity Assisted Inhomogeneity Correction Spectroscopy) provides a helpful and promising alternative to research on dynamic processes or chemical reactions.
Protection-against-water-attack determined difference between strengths of backbone hydrogen bonds in kinesin's neck zipper region
Diffusional inhomogeneity in cell cultures
Noise decomposition algorithm and propagation mechanism in feed-forward gene transcriptional regulatory loop
Theoretical analysis of suppressing Dick effect in Ramsey-CPT atomic clock by interleaving lock
State-to-state dynamics of F(2P)+HO(2Π) →O(3P)+HF(1∑+) reaction on 13A" potential energy surface
Excited state intramolecular proton transfer mechanism of o-hydroxynaphthyl phenanthroimidazole
By utilizing the density functional theory (DFT) and the time-dependent density functional theory (TDDFT), the excited state intramolecular proton transfer (ESIPT) mechanism of o-hydroxynaphthyl phenanthroimidazole (HNPI) is studied in detail. Upon photo is excited, the intramolecular hydrogen bond is obviously enhanced in the S1 state, which thus promotes the ESIPT process. Hydrogen bond is shown to be strengthened via comparing the molecular structures and the infrared vibration spectra of the S0 and S1 states. Through analyzing the frontier molecular orbitals, we can conclude that the excitation is a type of the intramolecular charge transfer excitation, which also indicates the trend of proton transfer in S1 state. The vertical excitation based on TDDFT calculation can effectively repeat the absorption and fluorescence spectra of the experiment. However, the fluorescence spectrum of normal structure, which is similar to the spectrum of isomer structure is not detected in the experiment. It can be concluded that the fluorescence measured in the experiment is attributed to both structures. In addition, by analyzing the potential energy curves (PECs) calculated by the B3LYP functional method, it can be derived that since the molecule to cross the potential barrier in the S1 state is smaller than in the S0 state and the reverse proton transfer process in the S1 state is more difficult than in the S0 state, the ESIPT occurs in the S1 state.
Comparisons of electrical and optical properties between graphene and silicene-A review
Temporal interference driven by an oscillating electric field in photodetachment of H- ion
Temperature dependence of line parameters of 12C16O2 near 2.004 μm studied by tunable diode laser spectroscopy
The absorption spectrum of carbon dioxide at 2.004 μm has been recorded at sample temperatures between 218.0 K and room temperature, by using a high-resolution tunable diode laser absorption spectrometer (TDLAS) combined with a temperature controlled cryogenically cooled absorption cell. The self-, N2-, and air-broadening coefficients for nine transitions of 12C16O2 belonging to the 20012 ← 00001 band in the 4987 cm-1-4998 cm-1 region have been measured at different temperatures. From these measurements, we have further determined the temperature dependence exponents of the pressure-broadening coefficients. To the best of our knowledge, the temperature dependence parameters of the collisional broadening coefficients are reported experimentally for the first time for these nine transitions. The measured halfwidth coefficients and the air temperature dependence exponents of these transitions are compared with the available values reported in the literature and HITRAN 2012 database. Agreements and discrepancies are also discussed.
Responsive mechanism and molecular design of di-2-picolylamine-based two-photon fluorescent probes for zinc ions
Exploring the methane combustion reaction: A theoretical contribution
This paper represents an attempt to extend the mechanisms of reactions and kinetics of a methane combustion reaction. Three saddle points (SPs) are identified in the reaction CH4+O(3P) → OH +CH3 using the complete active space selfconsistent field and the multireference configuration interaction methods with a proper active space. Our calculations give a fairly accurate description of the regions around the twin first-order SPs (3A' and 3A") along the direction of O(3P) attacking a near-collinear H-CH3. One second-order SP2nd (3E) between the above twin SPs is the result of the C3v symmetry Jahn-Teller coupling within the branching space. Further kinetic calculations are performed with the canonical unified statistical theory method with the temperature ranging from 298 K to 1000 K. The rate constants are also reported. The present work reveals the reaction mechanism of hydrogen-abstraction by the O(3P) from methane, and develops a better understanding for the role of SPs. In addition, a comparison of the reactions of O(3P) with methane through different channels allows a molecule-level discussion of the reactivity and mechanism of the title reaction.
Higher order harmonics suppression in extreme ultraviolet and soft x-ray
Sub-external cavity effect and elimination method in laser self-mixing interference wave plate measurement system
Double-rod metasurface for mid-infrared polarization conversion
Quantum state transfer via a hybrid solid-optomechanical interface
Absorption linewidth inversion with wavelength modulation spectroscopy
Spectral redshift of high-order harmonics by adding a weak pulse in the falling part of the trapezoidal laser pulse
We investigate the spectral redshift of high-order harmonics of the H2+ (D2+) molecule by numerically solving the non-Born-Oppenheimer time-dependent Schrödinger equation (TDSE). The results show that the spectral redshift of high-order harmonics can be observed by adding a weak pulse in the falling part of the trapezoidal laser pulses. Comparing with the H2+ molecule, the shift of high-order harmonic generation (HHG) spectrum for the D2+ molecule is more obvious. We employ the spatial distribution in HHG and time-frequency analysis to illustrate the physical mechanism of the spectral redshift of high-order harmonics.
Influence of intra-cavity loss on transmission characteristics of fiber Bragg grating Fabry-Perot cavity
A theoretical model of the fiber Bragg grating Fabry-Perot (FBG-FP) transmission spectrum considering loss of FBG and intra-cavity fiber is presented. Several types of FBG-FPs are inscribed experimentally, and their spectra are measured. The results confirm that weak intra-cavity loss is enhanced at the resonance transmission peak, that is, loss of transmission peaks is observably larger than other wavelengths. For FBG-FPs with multi resonance peaks, when the resonance peak wavelength is closer to the Bragg wavelength, the more significant loss effect of resonance transmission peak is exhibited. The measured spectra are fitted with the presented theoretical model. The fitted coefficient of determinations are near 1, which proves the validity of the theoretical model. This study can be applied to measure FBG loss more accurately, without a reference light. It can play an important role in FBG and FBG-FP writing process optimization and application parameter optimization.
Fabrication of mixed perovskite organic cation thin films via controllable cation exchange
Multiple off-axis acoustic vortices generated by dual coaxial vortex beams
Influence of mode conversions in the skull on transcranial focused ultrasound and temperature fields utilizing the wave field separation method: A numerical study
Transcranial focused ultrasound is a booming noninvasive therapy for brain stimuli. The Kelvin-Voigt equations are employed to calculate the sound field created by focusing a 256-element planar phased array through a monkey skull with the time-reversal method. Mode conversions between compressional and shear waves exist in the skull. Therefore, the wave field separation method is introduced to calculate the contributions of the two waves to the acoustic intensity and the heat source, respectively. The Pennes equation is used to depict the temperature field induced by ultrasound. Five computational models with the same incident angle of 0° and different distances from the focus for the skull and three computational models at different incident angles and the same distance from the focus for the skull are studied. Numerical results indicate that for all computational models, the acoustic intensity at the focus with mode conversions is 12.05% less than that without mode conversions on average. For the temperature rise, this percentage is 12.02%. Besides, an underestimation of both the acoustic intensity and the temperature rise in the skull tends to occur if mode conversions are ignored. However, if the incident angle exceeds 30°, the rules of the over-and under-estimation may be reversed. Moreover, shear waves contribute 20.54% of the acoustic intensity and 20.74% of the temperature rise in the skull on average for all computational models. The percentage of the temperature rise in the skull from shear waves declines with the increase of the duration of the ultrasound.
Numerical study on discharge characteristics influenced by secondary electron emission in capacitive RF argon glow discharges by fluid modeling
Electric field in two-dimensional complex plasma crystal: Simulated lattices
Schamel equation in an inhomogeneous magnetized sheared flow plasma with q-nonextensive trapped electrons
Dust charging and levitating in a sheath of plasma containing energetic particles
A fast emittance measurement unit for high intensity DC beam
Rayleigh-Taylor instability at spherical interfaces of incompressible fluids
Analytical studies on the evolution processes of rarefied deuterium plasma shell Z-pinch by PIC and MHD simulations
Effect of actuating frequency on plasma assisted detonation initiation
Structural, magnetic properties, and electronic structure of hexagonal FeCoSn compound
The structural, magnetic properties, and electronic structures of hexagonal FeCoSn compounds with as-annealed bulk and ribbon states were investigated by x-ray powder diffraction (XRD), differential scanning calorimetry (DSC), transmission electron microscope (TEM), scanning electron microscope (SEM), magnetic measurements, and first-principles calculations. Results indicate that both states of FeCoSn show an Ni2In-type hexagonal structure with a small amount of FeCo-rich secondary phase. The Curie temperatures are located at 257 K and 229 K, respectively. The corresponding magnetizations are 2.57 μB/f.u. and 2.94 μB/f.u. at 5 K with a field of 50 kOe (1 Oe=79.5775 A·m-1). The orbital hybridizations between 3d elements are analyzed from the distribution of density of states (DOS), showing that Fe atoms carry the main magnetic moments and determine the electronic structure around Fermi level. A peak of DOS at Fermi level accounts for the presence of the FeCo-rich secondary phase. The Ni2In-type hexagonal FeCoSn compound can be used during the isostructural alloying for tuning phase transitions.
Light trapping and optical absorption enhancement in vertical semiconductor Si/SiO2 nanowire arrays
Theoretical study on electronic structure and thermoelectric properties of PbSxTe1-x (x=0.25, 0.5, and 0.75) solid solution
Thermal conductivity of carbon nanotube superlattices: Comparative study with defective carbon nanotubes
Effect of isotope doping on phonon thermal conductivity of silicene nanoribbons: A molecular dynamics study
Thermoelectric properties of two-dimensional hexagonal indium-VA
Electronic structures and optical properties of HfO2-TiO2 alloys studied by first-principles GGA+ U approach
Intersubband optical absorption of electrons in double parabolic quantum wells of AlxGa1-xAs/AlyGa1-yAs
Characteristic modification by inserted metal layer and interface graphene layer in ZnO-based resistive switching structures
Observation of nonconservation characteristics of radio frequency noise mechanism of 40-nm n-MOSFET
Highly stable two-dimensional graphene oxide: Electronic properties of its periodic structure and optical properties of its nanostructures
A transparent electromagnetic-shielding film based on one-dimensional metal-dielectric periodic structures
Magnetocaloric effect in the layered organic-inorganic hybrid (CH3NH3)2CuCl4 Hot!
We present a study of magnetocaloric effect of the quasi-two-dimensional (2D) ferromagnet (CH3NH3)2CuCl4 in ab plane (easy-plane). From the measurements of magnetic field dependence of magnetization at various temperatures, we have discovered a large magnetic entropy change associated with the ferromagnetic-paramagnetic transition. The heat capacity measurements reveal an abnormal adiabatic change below the Curie temperature Tc~8.9 K, which is caused by the nature of quasi-2D layered crystal structure. These results suggest that perovskite organic-inorganic hybrids with a layered structure are suitable candidates as working substances in magnetic refrigeration technology.
First-principles study of polarization and piezoelectricity behavior in tetragonal PbTiO3-based superlattices
Using first-principles calculation, the contribution of A-site and B-site atoms to polarization and piezoelectricity d33 in the tetragonal PbTiO3/KNbO3 and PbTiO3/LaAlO3 superlattices is investigated in this paper. It is shown that PbTiO3/KNbO3 superlattice has larger polarization and d33 than PbTiO3/LaAlO3 superlattice, because there is stronger charge transfer between A(B)-site atoms and oxygen atom in PbTiO3/KNbO3 superlattice. In PbTiO3/KNbO3 superlattice, B-site atoms (Ti, Nb) make larger contribution to the total polarization and d33 than the A-site atoms (Pb, K) because of the strong covalent interactions between the transition metal (Ti, Nb) and the oxygen atoms, while piezoelectricity in PbTiO3/LaAlO3 superlattice mainly ascribes to piezoelectric contribution of Pb atom and Ti atom in PbTiO3 component. Furthermore, by calculating the proportion of the piezoelectric contribution from PbTiO3 component in superlattices, we find there is different response of strain to piezoelectric contribution from PbTiO3 component in two superlattices but still with a value larger than 50%. In PbTiO3/KNbO3 superlattice, the c-axis strain reduces the proportion, especially under tensile condition. Meanwhile in PbTiO3/LaAlO3 superlattice, PbTiO3 plays a leading role to the total d33, especially under compressive condition, and the proportion decreases as the tensile strain increases.
Multiple broadband magnetoelectric response in Terfenol-D/PZT structure
Optimizing effective phase modulation in coupled double quantum well Mach-Zehnder modulators
Optically induced abnormal terahertz absorption in black silicon
Investigation of europium(Ⅲ)-doped ZnS for immunoassay
Magnetic field aligned orderly arrangement of Fe3O4 nanoparticles in CS/PVA/Fe3O4 membranes Hot!
The CS/PVA/Fe3O4 nanocomposite membranes with chainlike arrangement of Fe3O4 nanoparticles are prepared by a magnetic-field-assisted solution casting method. The aim of this work is to investigate the relationship between the microstructure of the magnetic anisotropic CS/PVA/Fe3O4 membrane and the evolved macroscopic physicochemical property. With the same doping content, the relative crystallinity of CS/PVA/Fe3O4-M is lower than that of CS/PVA/Fe3O4. The Fourier transform infrared spectroscopy (FT-TR) measurements indicate that there is no chemical bonding between polymer molecule and Fe3O4 nanoparticle. The Fe3O4 nanoparticles in CS/PVA/Fe3O4 and CS/PVA/Fe3O4-M are wrapped by the chains of CS/PVA, which is also confirmed by scanning electron microscopy (SEM) and x-ray diffraction (XRD) analysis. The saturation magnetization value of CS/PVA/Fe3O4-M obviously increases compared with that of non-magnetic aligned membrane, meanwhile the transmittance decreases in the UV-visible region. The o-Ps lifetime distribution provides information about the free-volume nanoholes present in the amorphous region. It is suggested that the microstructure of CS/PVA/Fe3O4 membrane can be modified in its curing process under a magnetic field, which could affect the magnetic properties and the transmittance of nanocomposite membrane. In brief, a full understanding of the relationship between the microstructure and the macroscopic property of CS/PVA/Fe3O4 nanocomposite plays a vital role in exploring and designing the novel multifunctional materials.
Suppression of electron and hole overflow in GaN-based near-ultraviolet laser diodes
Robust stability characterizations of active metamaterials with non-Foster loads
Observation of oscillations in the transport for atomic layer MoS2
Influences of substrate temperature on microstructure and corrosion behavior of APS Ni50Ti25Al25 inter-metallic coating
A low-outgassing-rate carbon fiber array cathode
Enhanced radiation-induced narrow channel effects in 0.13-μm PDSOI nMOSFETs with shallow trench isolation
Effects of proton irradiation at different incident angles on InAlAs/InGaAs InP-based HEMTs
Influence of anisotropy on the electrical conductivity and diffusion coefficient of dry K-feldspar: Implications of the mechanism of conduction
The electrical conductivities of single-crystal K-feldspar along three different crystallographic directions are investigated by the Solartron-1260 Impedance/Gain-phase analyzer at 873 K-1223 K and 1.0 GPa-3.0 GPa in a frequency range of 10-1 Hz-106 Hz. The measured electrical conductivity along the ⊥ axis direction decreases with increasing pressure, and the activation energy and activation volume of charge carriers are determined to be 1.04 ±0.06 eV and 2.51 ±0.19 cm3/mole, respectively. The electrical conductivity of K-feldspar is highly anisotropic, and its value along the ⊥ axis is approximately three times higher than that along the ⊥ axis. At 2.0 GPa, the diffusion coefficient of ionic potassium is obtained from the electrical conductivity data using the Nernst-Einstein equation. The measured electrical conductivity and calculated diffusion coefficient of potassium suggest that the main conduction mechanism is of ionic conduction, therefore the dominant charge carrier is transferred between normal lattice potassium positions and adjacent interstitial sites along the thermally activated electric field.
Quantitative and sensitive detection of prohibited fish drugs by surface-enhanced Raman scattering
Rapid and simple detections of two kinds of prohibited fish drugs, crystal violet (CV) and malachite green (MG), were accomplished by surface-enhanced Raman scattering (SERS). Based on the optimized Au/cicada wing, the detectable concentration of CV/MG can reach 10-7 M, and the linear logarithmic quantitative relationship curves between logI and logC allows for the determination of the unknown concentration of CV/MG solution. The detection of these two analytes in real environment was also achieved, demonstrating the application potential of SERS in the fast screening of the prohibited fish drugs, which is of great benefit for food safety and environmental monitoring.
Generation of optimal persistent formations for heterogeneous multi-agent systems with a leader constraint