[en] The synthesis and crystal structure of the rare earth borogermanate EuGeBO_5 are reported. It is synthesized by high-temperature solid-state reaction and crystallizes in the monoclinic space group P2_1/c (no. 14) with the unit cell parameters a=4.8860(5), b=7.5229(8), c=9.9587(10) Aa, and β=91.709(3) . Its crystal structure features a polyanion-type layer (GeBO_5)"3"- constructed by BO_4 and GeO_4 tetrahedra connected alternatingly. Eu"3"+ ions are located in cavities and are coordinated by eight O atoms. Various structures of the related compounds REMM'O_5 (RE=rare earth metal; M=Si, Ge, and Sn; M'=B, Al, and Ga) are also discussed.

[en] The operation and monitoring (OM) interface is the digital medium between nuclear power system and operators. The cognitive load of OM interface has an important effect on the operation errors made by operator during OM task between operator and computer. The cognitive load model of OM interface is constructed for analysing the composition and influencing factors of OM interface cognitive load. And to study the coping strategies and methods for cognitive load of nuclear power system. An experiment method based on eye movement is proposed to measure the cognitive load of OM interface. Experiment case is carried out with 20 subjects and typical OM interface of a nuclear power system simulator. The OM interface is optimized based on the experiment results. And the results comparison between the original OM interface and the optimized OM interface shows that the cognitive load model and proposed method is valuable contributions in reducing the cognitive load and improving the interaction efficiency of OM tasks.

[en] The relations between the electrical characteristics of BaSn_1-xSb_xO₃ perovskite system and the contents of BaO, Sb₂O₃ and silicate sintering agent were studied by X-ray diffraction analysis and Moessbauer spectroscopy. It was found that the electrical conductivity is related to the substitution of Sb⁵⁺ for Sn⁴⁺, the content of sintering agent and the phase constituents in samples. BaSnO₃, Ba₃Sn₂O₇, Ba₂SnO₄ and SnO₂ phases might appear in different fractions when the contents of BaO change from 0.5 mole to 3.5 mole. In low antimony percentage condition, pentavalent Sb⁵⁺ ions inserted in Sn⁴⁺ sites and formed the donor center. In high antimony percentage (x≥0.20) condition, the existence of an insulating phase (BaSb₂O₆) was confirmed. (orig.)

[en] Objective: To evaluate the clinical efficacy of selective salpingography (SSG) and fallopian tube recanalization (FTR) in diagnosing and treating fallopian tubal infertility. Methods: SSG was performed in 459 patients and a total of 895 fallopian tubes were proved to be completely or incompletely occluded. Under fluoroscopic guidance, a catheter was managed to be placed in the tubal ostium, then a catheter and guide wire system was used to clear the proximal tube. The cumulative pregnancy rate within eighteen months after the treatment was calculated, and the postoperative tubal patency degree was compared with the preoperative one. Results: After FTR complete patency was achieved in 572 tubes(63.9%). For complete occluded tubes the postoperative patent rate was 80.3%(53/66), while it was 96.7% (802/829) for incomplete occluded tubes. During the follow-up period of 18 months, the pregnancy was confirmed in 43.9% patients(93/212), among which ectopic pregnancy was seen in 2.1% patients (2/93). The median procedure-conception interval was 8.2 months. The pregnancy rate was 51.3% (58/113) in patients with basically patent bilateral fallopian tubes, and it was 35.4% (35/99) in patients with incomplete patent fallopian tubes. Conclusion: The results clearly indicate that SSG together with FTR is a safe and effective method for the treatment of female infertility caused by proximal blockage or incomplete occlusion of the fallopian tubes. (authors)

[en] Partial substitution of Co with Fe in LiNi_0.8Co_0.15Al_0.05O₂ is carried out via ball-milling followed by a two-step solid reaction. The LiNi_0.8Co_0.15-yFe_yAl_0.05O₂ (0 ≤ y ≤ 0.15) samples exhibit significantly improved cyclic stability compared to pristine LiNi_0.8Co_0.15Al_0.05O₂, although the specific capacity decreases with increasing of the Fe content. In particular, the LiNi_0.8Co_0.075Fe_0.075Al_0.05O₂ material exhibits high capacity retention of 88.4% at 1 C after 350 cycles, relative to that of 55.7% for the pristine LiNi_0.8Co_0.15Al_0.05O₂. This phenomenon is more obvious at high rate and elevated temperature. The electrochemical impedance spectra and X-ray photoelectron spectra analysis demonstrate that less solid electrolyte interface film is formed on LiNi_0.8Co_0.075Fe_0.075Al_0.05O₂ than LiNi_0.8Co_0.15Al_0.05O₂. The significantly improved cyclability is mainly attributed to the effect of the FeO₆ octahedron on the edge-shared NiO₆ octahedra via enhanced electron localization. As a result, the tendency to generate reactive oxygen species at the interface could be reduced, leading to suppression of the oxidation of the electrolyte.

[en] A AlAs/GaAs/AlAs/AlGaAs double-barrier superlattice grown on GaAs substrate by MEB has been studied by combining double-crystal X-ray diffraction and synchrotron radiation. This combination provides a comprehensive structural analysis. During simulation by X-ray dynamical diffraction theory, we find the intensity of satellite peaks which situated near-by the modulated wave point of one layer are very sensitive to the variation of the layer's structural parameters. According to these, the accurate layer thickness can be get with an error less than 0.1 nm. The modulated phenomenon is investigated by X-ray kinematical diffraction theory

[en] La_0.7Ca_0.3MnO₃:xZn_0.95Co_0.05O (x = 0.0, 0.05, 0.1, 0.15 mol) composites are prepared by a sol-gel process. X-ray diffraction and energy diffraction spectroscopy reveal that there is no evidence of a reaction between the La_0.7Ca_0.3MnO₃ (LCMO) and Zn_0.95 Co_0.05 O (ZCO). Magnetization M, Curie temperature TC and metal-insulator transition temperatures T_p are observed to decrease with increasing ZCO content. Compared with x = 0.0, a great enhancement in the magnetoresistance (MR) is observed at around T_C for x = 0.05, 0.10, 0.15. Based on the tunneling MR and percolation models, this great change of MR is well explained. (condensed matter: electronic structure, electrical, magnetic, and optical properties)

[en] Transient electronics has attracted interest as an emerging technology to solve electronic-waste problem, due to its physically vanishing ability in solution. Here in this work, we demonstrate a flexible and degradable transient resistive switching (RS) memory device with simple structure of Cu/sodium alginate (SA)/ITO. The device presents excellent RS characteristics as well as high flexibility, including low operating voltage (< 1.5 V) and multilevel RS behavior. No performance degradation occurs after bending the device 50 times. Moreover, our device can be absolutely dissolved in deionized water. The proposed SA-based transient memory device has great potential for the development of green and security memory devices. (paper)

[en] Semiconductor based photocatalytic water splitting as a most bright method to solve the energy crisis has been widely studied in the past decade. Among them, MXene has become the focus of current research as a new, effective and inexpensive promoter-free catalyst. Herein, a novel 1D/2D photocatalyst of TiO₂/Ti₃C₂ is successfully prepared by electrostatic self-assembly technique. The maximum H₂ production rate of TiO₂/Ti₃C₂ nanocomposites is up to 6.979 mmol h⁻¹ g⁻¹, which is 3.8 times that of pure TiO₂ nanofibers (NFs). This improvement in photocatalytic H₂ production of TiO₂/Ti₃C₂ is originated from the heterogenous interface between TiO₂ NFs and Ti₃C₂ nanosheets. It brings higher photocatalytic efficiency and maintains its cycle H₂ production capacity. There is almost no decrease in photocatalytic H₂ production efficiency after 5 cycles. It is believed that this study can offer an innovative pathway to design high performance and low-cost photocatalytic materials composed of MXene co-catalyst for efficient water splitting H₂ production over semiconductors.

[en] Highlights: • The electrochemical performance of NCM811 at high voltage and high temperature were improved. • LiFePO₄/C coating layer can reduce the impact of H₂O and CO₂ in the air on NCM811. • LiFePO₄/C coating layer was beneficial for the migration of Li⁺ and inhibit electrolyte decomposition. • LiFePO₄/C coating can suppress the changes in the macro-volume of NCM811. -- Abstract: LiFePO₄/C (LFP/C)-coated LiNi_0.8Co_0.1Mn_0.1(NCM811) was prepared by a simple ball milling method (400 rpm for 4 h), and the influence of different coating amounts of LFP/C on the electrochemical performance of NCM811 was studied in detail. When the LFP/C coating amount was 1 wt%, the material maintained good electrochemical cycling stability and rate performance. The capacity retention of NCM811 @ 1LFP/C after 300 cycles was 61.6% at 25 ℃, which was significantly better than the corresponding value of 48.63% of NCM811. Simultaneously, the high temperature (55 ℃) and high pressure (2.8–4.5 V) cycling stability performance of NCM811 @ 1LFP/C was also better than for uncoated materials. The EIS results showed that the 1LFP/C modification effectively reduced R_SEI (from 46.37 to 32.13 Ω) and Rct (from 155.9 to 113.5 Ω), which was beneficial for the interface charge transfer of electrons and Li⁺ ions, consistent with the CV analysis. The XRD, XPS, and FESEM results indicated that the coating layer suppressed the changes in the NCM811 particle macro-volume and reduced the side reactions, improving the electrochemical performance of Nickel-rich layered materials.