十堰市某滑坡风险分析评价

对十堰市某滑坡及其影响范围进行调查,查清滑坡变形特征和危害情况,采用定量评价方法,开展稳定性、危险性、承灾体易损性分析评价,在此基础上,进行滑坡风险分析评价,计算得到该滑坡最大财产损失为61.292万元/年,最大人口风险为1.599人/年,风险等级为极高风险,建议采取加强监测、搬迁避让或适当工程治理等方法进行风险管控,以达到防灾减灾的目的。对今后开展单体滑坡风险分析评价有一定的借鉴意义。     

WSe2/rGO hybrid structure: A stable and efficient catalyst for hydrogen evolution reaction

The number of exposed active sites in a catalyst plays a key role in determining its catalytic performance. However, the aggregation effect in nanostructured catalysts causes much less reactive sites exposed. In this paper, we report a novel structure of WSe₂/rGO with highly exposed WSe₂ active edge sites by uniformly imbedding the rGO between each WSe₂ nanosheets. With the introduction of rGO, the electron transport property of the WSe₂/rGO hybrid structure has also been enhanced. The structure and composition of the samples were investigated by the X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy and transmission electron microscopy. Our electrochemical characterizations confirm that the WSe₂/rGO hybrid structure exhibits enhanced electrochemical catalytic performance with a Tafel slop of 85 mV/dec for HER, much smaller than that of the pure WSe₂.     

Robust Tracking Control with Preview Action for Uncertain Discrete-time Systems

International Journal of Control, Automation and Systems - This paper discusses the robust preview control problem for uncertain discrete-time systems, where future reference and disturbance...     

气化灰基腻子粉的制备与性能研究

为实现气化灰综合利用和降低腻子粉制备成本，研究了利用气化灰替代水泥制备腻子粉的技术可行性。以气化灰和 42.5水泥为主要原料，配以少量的羟丙基甲基纤维素和可分散性乳胶粉，制备气化灰基腻子粉，实验考察原料配方变化对腻子粉的性能影响。研究结果表明：利用气化灰替代水泥制品制备腻子粉具有可行性。其中，气化灰替代 50%水泥时，腻子粉的粘结强度为 0.82 Mpa，各项性能均优于建筑外墙用腻子粉标准 JG/T 157—2009要求。在相同条件下，气化灰替代不超过 70%的水泥时，腻子粉的粘结强度及其他指标均满足建筑外墙用腻子粉标准 JG/T 157—2009要求。     

Polytetrafluoroethylene-intercalated MXene membranes with good photothermal performance for enhanced laser ignition

Photothermal effect has been widely used in many areas such as cancer therapy, photothermal energy harvesting, and laser ignition. However, exploring reliable and efficient free-standing energy converter for enhancing the photothermal performance is still a challenge. Herein, free-standing membrane based on two-dimensional MXene (Ti₃C₂) nanosheets and polytetrafluoroethylene (PTFE) was fabricated and characterized by X-ray diffraction, scanning electron microscopy and differential scanning calorimetry, which demonstrated a drastic temperature rise by laser irradiation and was further used as energy converter for enhancing the photothermal performance of laser ignition. Furthermore, the initiating power of the laser initiator can be largely reduced by adding a thin layer of MXene/PTFE membrane above the B/KNO₃ cylinder. This work can give great promise for MXene-based membranes as the laser energy converter for reducing the initiating energy and promote the development of laser initiators with low initiating energy.     

Effects of ionic radius on phase evolution in Ln-Al co-doped Ca1-xLnxZrTi2-xAlxO7 (Ln = La,Nd, Gd,Ho, Yb) solid solutions

Zirconolite ceramic has been considered as a promising matrix to dispose high-level radioactive waste due to its excellent performance in immobilizing radionuclides. In this work, a series of zirconate solid solutions with stoichiometric Ca_1-xLn_xZrTi_2-xAl_xO₇ (Ln = La, Nd, Gd, Ho, Yb; x?=?0.1–1) were systematically studied to investigate the radius effect on their phase evolution. Powder X-ray diffraction (XRD) and scanning electron microscopy with energy dispersive X-Ray spectrometry (SEM-EDX) were used to characterize the products. XRD and SEM results show that complete solid solutions of Ln and Al in zirconolite phase for Ca_1-xLn_xZrTi_2-xAl_xO₇ cannot found. In the Ca_1-xLa_xZrTi_2-xAl_xO₇ ceramics, single zirconolite phase cannot form, instead of multiple phases, such as zirconolite-2M, zirconia, perovskite and LaTi₂Al₉O₁₉. In the Nd-Al co-doping ceramics, nearly single zirconolite-2M and zirconolite-3O were found at x?≤?0.6 and 0.8?≤?x?≤?0.9, respectively. The miscibility gap between zirconolite-2M and 3O was found at x?=?0.7. Single zirconolite-2M formed in the Gd-Al, Ho-Al and Yb-Al co-doped ceramics can only be detected in a compositional range of 0.1?≤?x?≤?0.8. Higher incorporation contents in these three series can form an additional phase cubic zirconia which is usually a ceramic waste form for radionuclides. Based on the XRD data, lattice parameters of zirconolite-2M and zirconolite-3O were calculated by Pawley refinement method. The evolution of lattice parameters of zirconolite-2M shows great difference between different lanthanide ions, indicating different substitution mechanisms in the Ln-Al co-doped zirconolite-2M.