阶段嗣后充填采场护壁矿稳定性研究

针对红岭铅锌矿采用阶段空场嗣后充填采矿法中的采空区护壁矿厚度合理取值问题，通过理论计算研究护壁矿应力和挠度变化规律，并利用FLAC3D数值模拟分析方法，对不同工况下护壁矿厚度的稳定性进行研究，最终确定最优护壁矿厚度。研究表明：1）根据压杆变形理论和极限挠度计算，护壁矿最大挠度随着厚度的增大而减小，且护壁矿最优厚度为3 m；2）根据模拟分析可得，护壁矿厚度应当超过3 m，才能更好地保证护壁矿的安全稳定；3）护壁矿z向应力曲线呈倒“U”型分布，最大应力集中在护壁矿两端，与理论应力分布相似。本文研究为相似矿山护壁矿厚度选择提供一定的理论依据和分析方法。     

复杂系统的计量性设计与评估

从产品的计量性概念出发,以用户的视角和愿望,提出了计量性的14个设计要素构成的指标体系及设计原则,用以指导产品的计量性设计;对于计量性设计的优劣,使用了相同的14个要素进行评估,并可用于比较不同的计量性设计的优劣。     

A Unique Etching-Doping Route to Fe/Mo Co-Doped Ni Oxyhydroxide Catalyst for Enhanced Oxygen Evolution Reaction

Fe-doped Ni (oxy)hydroxide shows intriguing activity toward oxygen evolution reaction (OER) in alkaline solution, yet it remains challenging to further boost its performance. In this work, a ferric/molybdate (Fe³⁺/MoO₄²⁻) co-doping strategy is reported to promote the OER activity of Ni oxyhydroxide. The reinforced Fe/Mo-doped Ni oxyhydroxide catalyst supported by nickel foam (p-NiFeMo/NF) is synthesized via a unique oxygen plasma etching-electrochemical doping route, in which precursor Ni(OH)₂ nanosheets are first etched by oxygen plasma to form defect-rich amorphous nanosheets, followed by electrochemical cycling to trigger simultaneously Fe³⁺/MoO₄²⁻ co-doping and phase transition. This p-NiFeMo/NF catalyst requires an overpotential of only 274 mV to reach 100 mA cm⁻² in alkaline media, exhibiting significantly enhanced OER activity compared to NiFe layered double hydroxide (LDH) catalyst and other analogs. Its activity does not fade even after 72 h uninterrupted operation. In situ Raman analysis reveals that the intercalation of MoO₄²⁻ is able to prevent the over-oxidation of NiOOH matrix from β to γ phase, thus keeping the Fe-doped NiOOH at the most active state.