A new 111 type iron pnictide superconductor LiFeP

A new iron pnictide LiFeP superconductor was found. The compound crystallizes into a Cu2Sb structure containing an FeP layer showing superconductivity with maximum Tc of 6K. This is the first 111 type iron pnictide superconductor containing no arsenic. The new superconductor is featured with itinerant behavior at normal state that could helpful to understand the novel superconducting mechanism of iron pnictide compounds.Comment: 3 figures + 1 tabl

Photon-meson transition form factors of light pseudoscalar mesons

The photon-meson transition form factors of light pseudoscalar mesons $\pi ^{0}$, $\eta$, and $\eta ^{\prime}$ are systematically calculated in a light-cone framework, which is applicable as a light-cone quark model at low $Q^{2}$ and is also physically in accordance with the light-cone pQCD approach at large $Q^{2}$. The calculated results agree with the available experimental data at high energy scale. We also predict the low $Q^{2}$ behaviors of the photon-meson transition form factors of $\pi ^{0}$, $\eta$ and $\eta ^{\prime }$, which are measurable in $e+A({Nucleus})\to e+A+M$ process via Primakoff effect at JLab and DESY.Comment: 22 Latex pages, 7 figures, Version to appear in PR

Fluid Flow Modeling of a Gas-induced Pulsating Flow Bubble Column

A three-dimensional (3D) Euler-Euler gas-liquid two-phase mathematical model was developed for simulating the local transient fluid flow in a gas-induced pulsating flow bubble column using computational fluid dynamic (CFD) method, with multiple size group (MUSIG) model implemented to predict the bubble size distribution. Model simulated results such as local transient axial liquid velocities and time-averaged liquid turbulent kinetic energy distributions were validated successfully by corresponding experimental measurements under varied operating conditions, i.e. pulsating amplitudes and frequencies. It was found that the liquid turbulent kinetic energy increased with the increase in pulsating amplitude and frequency, and a maximum value appeared at an axial position of Z = 0.4 m, centerline of the column. Furthermore, local transient fluid flow characters such as the gas holdups, gas velocity fields and liquid velocity fields, as well as bubble size distributions were predicted reasonably by the proposed model

Differences in thermal-acoustic perception in various office behaviors

Thermal-acoustic interaction has vital research value in the development of soundscape prediction models. Previous studies on thermal-acoustic interaction have been focused mainly on perceptual changes. However, the differences in office behaviors warrant attention. We conducted an experimental study to explore the effects of various office behaviors (such as resting, reading, writing, and typing) on the thermal-acoustic interactive perception. The results showed that (at near thermal neutral temperature) (1) sound types affected thermal evaluation, acoustic evaluation, and overall evaluation. The sound of water significantly reduced the score for thermal sensation. (2) Behavior types affected thermal sensation, acoustic comfort, and overall comfort. Reading contributed to significantly lower scores than other behaviors for the three indicators. This indicated that when reading, people are more demanding of the environment. (3) The interaction of sound types and behavior types affected overall annoyance. Therefore, we recommend adjusting the office environment effectively and establishing more effective soundscape prediction models

Electronic correlations and unusual superconducting response in the optical properties of the iron-chalcogenide FeTe0.55Se0.45

The in-plane complex optical properties of the iron-chalcogenide superconductor FeTe0.55Se0.45 have been determined above and below the critical temperature Tc = 14 K. At room temperature the conductivity is described by a weakly-interacting Fermi liquid; however, below 100 K the scattering rate develops a frequency dependence in the terahertz region, signaling the increasingly correlated nature of this material. We estimate the dc conductivity just above Tc to be sigma_dc ~ 3500 Ohm-1cm-1 and the superfluid density rho_s0 ~ 9 x 10^6 cm-2, which places this material close to the scaling line rho_s0/8 ~ 8.1 sigma_dc Tc for a BCS dirty-limit superconductor. Below Tc the optical conductivity reveals two gap features at Delta_1,2 ~ 2.5 and ~ 5.1 meV.Comment: Minor revisions, 5 pages, 4 figure

Topological quantum phase transition in an extended Kitaev spin model

We study the quantum phase transition between Abelian and non-Abelian phases in an extended Kitaev spin model on the honeycomb lattice, where the periodic boundary condition is applied by placing the lattice on a torus. Our analytical results show that this spin model exhibits a continuous quantum phase transition. Also, we reveal the relationship between bipartite entanglement and the ground-state energy. Our approach directly shows that both the entanglement and the ground-state energy can be used to characterize the topological quantum phase transition in the extended Kitaev spin model.Comment: 9 Pages, 4 figure

A systematic investigation of cycle number, temperature and electric field strength effects on Si anode

The authors would like to deeply appreciate the support from the NNSFC (11572118 and 11772122), the Hunan Provincial Science Fund for Distinguished Young Scholars (2015JJ1006), the Project of Innovation-driven Plan in Central South University of China (2015CX004), the State Key Laboratory of Powder Metallurgy, and the National Key Research and Development Program of China (2016YFB0700300)