岩巷掘进配套装备及工艺技术

本文就岩巷快速掘进技术进行了具体的探究,从不同的角度对该项技术进行了探析。     

免充气塑料轮胎支撑结构对性能的影响

免充气塑料轮胎的支撑结构对轮胎性能有直接影响。本研究提出了一种具有连续支撑结构的免充气轮胎,利用ABAQUS软件,与两种现有免充气轮胎进行应力大小、接地性能以及刚度性能的对比。结果表明:连续支撑结构可改善免充气轮胎的应力,接地压力的分布均匀性;同时,连续支撑结构轮胎的纵向刚度、横向刚度均远好于同规格现有免充气轮胎和子午线轮胎;扭转刚度性能接近同规格子午线轮胎。通过分析可知,连续支撑结构轮胎在复杂工况路面有显著的优势,具有良好的发展前景。     

Supporting electrolyte interaction with the AACVD synthesized Rh thin film influences the OER activity

Electrocatalytic oxygen evolution reaction (OER) is one of the most promising candidates for the sustainable energy. This has led researchers to focus towards developing highly active electrocatalysts. Our work takes a wholistic approach to understanding the key factors that influence the OER process. We focused on preparing a metallic electrocatalyst and tested out its OER performance using two different supporting electrolytes. We also studied the effect of crystal planes of the electrocatalyst on the OER process using computational simulation (CS) methods. For this, rhodium (Rh) thin film (RhTF) electrocatalysts on indium tin oxide (RhTF_ITO) were fabricated for OER through aerosol assisted chemical vapor deposition (AACVD). The prepared electrodes showed excellent electrocatalytic activity for OER (for 10 mA/cm² η = 273 mV in 1.0 M KOH). The effect of the supporting electrolytes and the crystal planes of RhTF electrodes were analyzed using electroanalytical techniques and CS methods. Tafel slope (TS) analysis revealed that electron transfer kinetics was slower for the NaOH compared to the KOH. The scan rate (ν) analysis indicated that there is weak electrostatic interaction between the hydrated outer Helmholtz plane (OHP) of Na⁺ and K⁺ ions with the adsorbed OH_(ad) that impacts the OER process. With increasing ν the restructuring of the electrochemical double layer (EDL) increases resulting in similar OER performance for both the supporting electrolytes. The micro-kinetic analysis showed that the rate determining step (RDS) for NaOH and KOH required around 1.67 eV and 1.07 eV. The density functional theory (DFT) analysis revealed that these energy values are closest to the Rh (111) plane reaction pathway. Adsorption locator (AL) analysis further revealed that the hydrated cations could directly get adsorbed on the Rh crystal planes hindering the electron transfer (ET) in the OER process. The DFT analysis further revealed that the lowest energy pathway for the OER process is followed on the Rh (220) plane. These analyses demonstrated that it is possible to fine tune the OER using supporting electrolyte and electrocatalysts that can work synergistically for getting the optimal OER performance.     

城市雨水利用规划研究

利用雨水资源，可缓解城市供水紧张的状况，减少雨水工程投资及运行费用，控制水环境污染，防止地面沉降和海水倒灌。城市雨水利用规划的基本内容包括总体目标、规划原则、规划对策等，应建立城市雨水管网规划概念模型，并配套法律法规、技术规范等政策。     

端承桩承载力不会随时间而增长

强风化岩的力学指标不会随时间而增长，而淤泥层的固结，在端承桩条件下只能引起桩侧负摩擦而使桩的有效承载力略为下降。“解析法推算”所得桩极限荷载，只是预测试桩当时可能达到的极限荷载，而与“时间推移”无关。     

高层建筑结构设计实例

通过工程实践 ,详细讨论了高层建筑基础设计及框支梁构造设计 ,阐述了高层建筑地下室底板刚度的增强有利于减小房屋的不均匀沉降以及结构构造设计的重要性。     

浆喷桩在基坑开挖中的支护与防渗作用

泉州市石狮伍堡污水处理厂由于临近晋江入海口，地基以砂质土和淤泥质土为主，地下水丰富且受潮汐 影响较大。在污水积水池深达５．０ｍ的基坑开挖中，对基坑坑壁的支护与防渗要求较高，文中介绍浆喷搅拌桩对此问 题的解决，并论述其效果。     

热轧管深孔镗滚加工的走偏问题剖析与结构优化

为控制孔轴线的偏斜,提高孔轴线的直线度精度,降低废品率,剖析了深孔镗滚加工中刀具走偏的根本原因,提出了合理设置刀具参数、提高刀具装配精度和支承刚度、优化支承套结构等措施,从而改善了加工质量,获得了较为满意的结果。     

Ni-V负载酸改性焙烧高岭土的制备、表征及光催化性能

高岭土在773 K焙烧,经H2SO4溶液处理后作为载体,在不同n(Ni2+)∶n(V5+)溶液中浸渍制备了Ni-V负载酸改性焙烧高岭土样品,并利用X射线衍射(XRD)、傅里叶变换红外光谱(FTIR)、吡啶吸附FTIR(Py-FTIR)和紫外-可见光漫反射光谱(UV-Vis)对样品进行了表征。在高压汞灯下,以甲醇(CH3OH)常压转化制二甲醚(CH3OCH3)为模型反应,评价了Ni-V负载样品的光催化活性。结果表明,所制备催化剂对CH3OH的光催化转化有活性。当处理焙烧高岭土的酸溶液中H2SO4质量分数为40%、浸渍液n(Ni2+)∶n(V5+)=2∶8、样品焙烧温度为773 K时,催化剂样品对CH3OH转化反应活性最高,CH3OH转化率为30.5%,CH3OCH3选择性为76.2%。样品Ni-V的协同作用和表面酸性是促进CH3OH光催化转化制备CH3OCH3反应活性的重要影响因素。     

一种提高射频电缆焊接质量的工艺方法

射频连接器与射频电缆被广泛应用于军民品的通信设备中,其关键工序射频电缆芯线与射频连接器插针的连接常采用手钳式阻焊工具。由于射频电缆较细,手钳式阻焊工具在阻焊操作时,要求电装工双手不能抖动,否则易产生废品。通过对手钳式阻焊工具进行技术改进,重新设计了一种预压紧方式的阻焊装置,并通过试验确定了电阻焊接头的结构形式和尺寸,提高了手工阻焊成品率和生产效率,降低了对电装工的技能要求。