[en] The effect factors on reductive stripping of high content plutonium with hydroxylamine nitrate (HAN) from 30%TBP/OK were studied in this paper. The results show that prolonging the contact time, reducing HNO₃ concentration and increasing the temperature all are favorable to reductive stripping of Pu(Ⅳ). Although increasing the HAN concentration is also in favor of reductive stripping of Pu(Ⅳ), it's not visible for increasing percentage of reductive stripping Pu when the HAN concentration is more than 0.4 mol/L. Increasing the hydrazine concentration is also in favor of reductive stripping of Pu(Ⅳ), but the percentage of reductive stripping Pu is reduced with increasing of the hydrazine concentration when the hydrazine concentration is more than 0.2 mol/L. The effect of nitrate ion concentration on reductive stripping of Pu(Ⅳ) is greatly and the percentage of reductive stripping reduces with the increasing of concentration of plutonium. The process of reductive stripping for high content plutonium is affected significantly by the distribution of plutonium between liquid and organic. (authors)

[en] We investigate bidirectional teleportation that works in a fair and efficient manner. Two explicit protocols are proposed to realize bidirectional teleportation with a controller. One is a symmetric protocol for two-qubit states. The other is an asymmetric protocol for single- and two-qubit states. We then devise a universal protocol for arbitrary n ₁- and n ₂-qubit states via a (2n ₁ + 2n ₂ + 1)-qubit entangled state, where n ₁ ≤ n ₂. The receiver only needs to perform the single-qubit recovery operation, which is derived by a general expression. Moreover, a (2n ₁ + 1)-bit classical communication cost can be saved within the controller’s broadcast channel by the use of network coding technology. (paper)

[en] A uranium tailings dam in northern China was selected as the research object to collect uranium tailings samples in tailings dams, aquifer sand samples and water barrier clay samples. The isotherm adsorption law of U on soil samples and the leaching process of U under rainfall conditions were studied to obtain U adsorption and migration parameters in key strata and the release rule of source terms. Using FEFLOW6.2 software to establish a three-dimensional model of groundwater in the uranium tailings evaluation area, simulating U migration behavior and concentration distribution. The results show that the adsorption of U on sand and clay conforms to the linear isothermal adsorption model, the distribution coefficients k_d are 20.41 L/kg and 45.92 L/kg respectively. The equilibrium concentrations of U under acid rain leaching and deionized water leaching conditions during the experiment period were 0.83 mg/L and 0.79 mg/L, respectively. And the leaching rates were 46.07% and 20.92%, respectively. The simulation results show that after 30 years of migration, the maximum concentration of U in groundwater will reach 0.595 mg/L and the peak concentration migration distance is 36.44 m. After 50 years of migration, the maximum concentration of U in groundwater will reach 0.440 mg/L and the peak concentration migration distance is 42.93 m. (authors)

[en] Graphene oxide (GO) performs excellent adsorption property in removing organic pollutant out of the aqueous solution. GO adopted in this research was synthesized by using an improved Hummers approach. With the adoption of X-ray diffraction (XRD), Fourier transform infrared spectrometer (FTIR) and X-ray photoelectron spectroscopy (XPS), the samples were characterized. The mechanism of removing nonylphenol ethoxylates (NPEO₁₀) in the wastewater by GO was investigated through XPS and molecular simulations. The GO model was constructed on the basis of XPS outcomes and typical molecular formula of GO (C₁₀O₁(OH)₁(COOH)_0.5). The XPS results indicate that the GO surface is significantly within the coverage of NPEO₁₀. From MD simulations, it was shown that NPEO₁₀ molecules adsorbed at GO surface through oxygen-containing functional group, and the polar interactions between the ethoxylate group and oxygen-containing functional group on the GO surface were the primary factors during the process of adsorption. The negative interaction energy existing between NPEO₁₀ and GO model suggests that the GO-water-NPEO₁₀ system becomes more stable after adsorption.

[en] In this paper, we reveal that the enhanced transmission through a perforated metal film can be further boosted up by a V-shaped nanoslit, which consists of two connected oblique slits. The maximum transmission at resonance can be enhanced significantly by 71.5% in comparison with the corresponding vertical slit with the same exit width. The value and position of transmission resonance peak strongly depend on the apex angle of the V-shaped slit. The optimum apex angle, at which the transmission is maximal, is sensitive to the slit width. Such phenomena can be well explained by a concrete picture in which the incident wave drives free electrons on the slit walls. Moreover, we also simply analyze the splitting of the transmission peak in the symmetry broken V-shaped slit, originating from the resonances of different parts of the V-shaped slit. We expect that our findings will be used to design the nanoscale light sources based on the metal nanoslit structures

[en] Neutron capture on ${}^{16}$O may serve as a neutron poison in certain nucleosynthesis scenarios. We revisit this reaction at energy ranges of astrophysical interest, employing a novel theoretical approach that self-consistently treats capture through bound and resonant levels. Our covariant density functional theory is based on a relativistic mean field (RMF) theory with contributions from resonant orbitals included via the analytical continuation of the coupling constant (ACCC), and pairing correlations included via the resonant Bardeen-Cooper-Schrieffer (BCS) technique. We employ this RMF + ACCC + BCS approach to extract bound states, resonant states, and pairing correlations in ${}^{17}$O in a self-consistent microscopic way. We calculate ${}^{16}$O(n,γ)${}^{17}$O direct capture cross sections resulting from neutron E1 transitions from scattering states to bound states, resonant cross sections from a Breit-Wigner formalism, and Maxwellian-averaged cross sections and thermonuclear reaction rates for astrophysical applications. We use different effective interactions to determine the viability of our approach to determine the ${}^{17}$O level structure and corresponding reaction rates. Comparisons to measurements and database values are given.

[en] A series of amorphous and single-crystalline LaAlO₃ (LAO) thin films are fabricated by laser molecular-beam epitaxy technique on Si substrates under various conditions of deposition. The structure stability of the LAO films annealed in high temperature and various ambients is studied by x-ray diffraction as well as high-resolution transmission electron microscopy. The results show that the epitaxial LAO films have very good stability, and the structures of amorphous LAO thin films depend strongly on the conditions of deposition and post-annealing. The results reveal that the formation of LAO composition during the deposition is very important for the structure stability of LAO thin films. (authors)

[en] A field effect transistor (FET) has been fabricated that employs n-type SrTiO_3-δ as the source and drain, p-type Si as the semiconducting channel and SiO₂ as the gate insulator. A typical drain-source current-voltage characteristic is observed. The transconductance is 4 x 10^-6 A V^-1 at a drain-source voltage of 1 V. The ON/OFF ratios are 74 and 35 at gate voltages of 6 V and 12 V under a drain-source voltage of 0.8 V, respectively. The field effect mobility at room temperature is 47 cm² V^-1 s^-1 at a gate voltage of 1 V. The results demonstrate that it is possible to realize functional FETs based on the structure with perovskite oxide thin films and a conventional Si semiconductor.

[en] Highlights: • Coarse grained WC-Co cemented carbides were fabricated with different Co content. • The WC-Co composite powder was prepared through chemical coating method. • The microstructure and properties of WC-Co cemented carbides were improved. • The performance of cemented carbide related to the equilibrium growth of WC grain. Coarse grained WC-Co cemented carbides with Co content varying from 3 wt% to 12 wt% were fabricated from composite powder. The composite powder was prepared through chemical coating method that cobalt encased on the surface of WC particles. Effect of Co content on microstructure of the WC-Co cemented carbide was investigated by XRD, SEM and TEM. The experimental results indicate that the nanostructured cobalt coating exhibits spherical shape with a particle size ranging from 200 to 400 nm, and the WC-Co composite powder represents unique feature of WC particle encased by cobalt. With increasing Co content from 3 wt% to 12 wt%, the gradual increase of WC grain size from 5.23 μm to 6.67 μm, fracture toughness from 24.66 MPa m^1/2 to 28.83 MPa m^1/2 and transverse rupture strength from 2367.05 MPa to 2849.22 MPa of the WC-Co cemented carbides were resulted. The enhanced overall performance was attributed mainly to the equilibrium shape of WC caused by the well-encasing of cobalt on WC grain. This may give insights on the application of other coarse grained WC-based cemented carbides fabricated by chemically coated composite powder.

[en] BaNb_0.3Ti_0.7O₃/Si p-n junction combining the functional properties of oxide and Si electronics was fabricated by laser molecular-beam epitaxy, and the multifunctional properties of rectification, ferroelectricity and photoelectricity were experimentally studied. The good rectifying I-V characteristics, nanosecond ultrafast photoelectric effect, and ferroelectric property due to the interface enhancement were observed experimentally. The mechanisms of ferroelectric behavior and photoelectric process are discussed briefly