MoO_3/HZSM-5催化剂上重芳烃加氢脱烷基反应

采用等体积浸渍法制备了不同负载量的MoO3/HZSM-5催化剂,考察了MoO3/HZSM-5催化剂上MoO3负载量和工艺条件对重芳烃(C9+)加氢脱烷基反应的影响;并用X射线衍射、吡啶吸附红外光谱、氨程序升温脱附等技术对催化剂进行了表征。实验结果表明,重芳烃在MoO3/HZSM-5催化剂上的反应性能与HZSM-5分子筛上MoO3的分散状态、催化剂的酸性和酸量及工艺条件有关;当MoO3/HZSM-5催化剂中MoO3的负载量(质量分数)接近15%时,MoO3在HZSM-5分子筛表面呈单层分散。采用15%MoO3/HZSM-5催化剂,在550℃、3.0MPa、重时空速3.62h-1及V(H2)∶V(C9+)=800的反应条件下,重芳烃转化率达55.94%,苯、甲苯、二甲苯(BTX)收率大于50%,BTX总选择性达90%以上。     

单体支柱工作面支护密度设计

单体液压支柱支护的回采工作面 ,应按照支柱与顶板相互作用的机理 ,根据具体的工作面顶板压力及支柱承载能力 ,计算合理的支护密度。合理支护密度即以最少的支柱来保证回采工作面顶板处于良好的状态。     

催化剂浸渍干燥设备的计算流体力学模拟

对用于非固定床的负载型催化剂而言,粒度分布、强度、球形度等质量指标对催化反应过程有重大影响。干燥在炼油催化剂生产中是关键处理工艺之一,对催化剂产品的粒度分布、强度和球形度等指标有重大影响。为了提高催化剂的质量,开发了一种浸渍干燥器。根据工艺要求,建立了一个浸渍干燥器三维几何模型,并应用欧拉-欧拉双流体模型,进行了两相计算流体力学(CFD)模拟计算。通过干燥器内流场和气固两相分布的信息,获得了较优的浸渍干燥器进料管长度,为催化剂浸渍干燥器的设计与放大提供可靠指导。     

岸坡上桩基码头设计方案的分析比较

本文结合实际工程对码头桩基和岸坡相互作用的计算表明，桩基的受力和位移与其离岸的远近、倾斜方向有密切的关系；为抵御岸坡的水平位移，在后平台增设斜顶桩对改善桩基的受力条件和减少码头位移有较为显著的作用。     

Solid oxide solutions as catalysts —A comparison with supported Pt

The hydroformylation of olefins with the water soluble complex HRh(CO) [P(m-C₆H₄SO₃Na)₃]₃ (1) is dependent on the solubility of the olefins in the aqueous phase. In contrast, when the aqueous solution of1 is immobilized on a high surface area silica support the effects of the size of the olefins diminish. The immobilized catalyst1 on silica shows significant water loss but not rhodium leaching. It is proposed that the hydrophilic support holds the water soluble phosphines by hydrogen bonding of the hydrated sodium-sulphonate groups to the surface.     

无源微波遥感用于地震预报的实验研究

对无源微波遥感用于地震预报在理论研究的基础上对不同岩性不同结构的岩石试件进行了加载实验，测量了岩石试件的微波辐射随载荷的变化．实验得出：岩石试件的微波辐射能量随岩石应力状态变化而显著变化；而且，不同的波段变化的幅度不同；同一波段不同极化方式的波随应力变化的变化量也不同；微波辐射能量的变化能够被卫星微波遥感探测器探测到．实验还发现，岩石试件临破裂前出现明显的微波辐射异常．     

Highly Stable and Active Flexible Electrocatalysts Derived from Lotus Fibers

The stability and activity of electrocatalysts are fundamental in energy-related applications (e.g., hydrogen generation and energy storage). Electrocatalysts degrade over time when the active centers are not strongly anchored to the support. However, if the active centers are too strongly anchored, the activity of the electrocatalysts decreases due to reduced accessibility to reactants. Herein, a strategy is presented to balance the stability and activity of different active materials using a natural and flexible support material that can be woven and carbonized. Lotus fibers, which have surface hydroxyl and phenolic groups, high mechanical strength, and a mesoscale porosity post-pyrolysis, are used to load diverse functional metal-containing materials such as metal–organic frameworks, 2D materials, metal sulfide nanoparticles, metal ions, and high-entropy alloys. After pyrolysis, the electrocatalysts display flexibility, high catalytic performance, and long-term stability, outperforming commercial benchmarks (e.g., Pt/C) in specific scenarios for water splitting, liquid batteries, and flexible electronics.     

High Precision,Electrochemical Detection of Reversible Binding of Recombinant Proteins on Wide Bandgap GaN Electrodes Functionalized with Biomembrane Models

We report a novel hybrid charge sensor realized by the deposition of phospholipid monolayers on highly doped n‐GaN electrodes. To detect the binding of recombinant proteins with histidine‐tags, lipid vesicles containing chelator lipids were deposited on GaN electrodes pre‐coated with octadecyltrimethoxysilane monolayers. Owing to its optical transparency, GaN allows the confirmation of the fluidity of supported membranes by fluorescence recovery after photo‐bleaching (FRAP). The electrolyte‐(organic) insulator‐semiconductor (EIS) setup enables one to transduce variations in the surface charge density ΔQ into a change in the interface capacitance ΔC _p and, thus, the flat‐band potential ΔU _FB. The obtained results demonstrate that the membrane‐based charge sensor can reach a high sensitivity to detect reversible changes in the surface charge density on the membranes by the formation of chelator complexes, docking of eGFP with histidine tags, and cancellation by EDTA. The achievable resolution of ΔQ ≥ 0.1 μC/cm² is better than that obtained for membrane‐functionalized p‐GaAs, 0.9 μC/cm², and for ITO coated with a polymer supported lipid monolayer, 2.2 μC/cm². Moreover, we examined the potential application of optically active InGaN/GaN quantum dot structures, for the detection of changes in the surface potential from the photoluminescence signals measured at room temperature.