铁路起重机实际最大起重量的确定

铁路起重机在实际使用中,有时因条件限制无法从起重特性图表中查出其相对应的最大起重量,这对确保安全施工是极为不利的。本文按照确定性计算的原则,通过抗倾覆稳定性校核公式反求法,对这类实际工况最大起重量的确定进行了分析和计算,结果与吊装施工的实际情况很接近。     

有机酯类合成润滑油水解安定性的研究

研究了抗磨剂、抗氧剂和防腐剂对酯类油水解安定性的影响,发现有机胺类化合物能提高酯类油的水解安定性。     

二次曝光全息照相干涉仪及其在冲击波观测中的应用

本文简要阐述了全息照相术的原理及会聚冲击波的特点,在此基础上,设计了一种二次曝光全息照相干涉系统,使用该系统对圆柱形冲击波会聚过程的不稳定性进行了观测,得到了清晰的干涉图像,给出了几个重要结论。     

预裂爆破技术在边坡保护中的应用

结合工程实例, 阐述了运用预裂爆破技术保护边坡的爆破参数的确定及施工工艺。     

卵形结构“护壁合一”大型泵站逆作法在软土地区的应用

本文主要介绍在天津开发区软土地区建造大型泵站工程深基坑开挖设计的实践,供从事此项工作的技术人员参考。     

软土地区复合土钉墙支护的灾害研究

介绍超载和施工质量对复合土钉墙支护结构稳定性的影响及应对灾害的控制方法。     

188Re(Sn)-HEDP药盒的质量和稳定性研究

建立了^188Re(Sn)-HEDP药盒主要成分HEDP(1-hydroxy ethylidene diphosphonic acid)和氯化亚锡含量的分析方法。以标记率、HEDP和氯化亚锡的含量、无菌和内毒素检查为测试项目,按照中国药典对^188Re(Sn)-HEDP药盒进行了影响因素试验(强光、高温和高湿度)和低温保存有效期试验等稳定性研究。     

Effect of mineralizers for preparing ZrO2 support on the supported Ni catalyst for steam-CO2 bi-reforming of methane

Supported Ni catalysts on ZrO₂ towards steam-CO₂ bi-reforming (SCBR) of methane for the production of synthesis gas were synthesized by the hydrothermal process with different mineralizers followed by l-arginine ligand-assisted incipient wetness impregnation (HT-LA-IWI) method. The effect of type and amount of mineralizers for preparing ZrO₂ supports on the nature of supports and supported Ni catalysts, as well as on the catalytic properties and structure–performance relationship were investigated. Results show that the catalytic performance is strongly dependent on the morphology and textural of ZrO₂ support notably affected by the type and amount of mineralizer. The supported Ni catalyst on the ZrO₂ prepared by using sodium acetate (molar ratio of sodium acetate/zirconium, N_SAc/Zr = 0.5) as mineralizer (Ni/ZrO₂ (SAc0.5)) shows much higher catalytic activity than the one on ZrO₂ prepared by using sodium carbonate (molar ratio of sodium carbonate/zirconium, N_SC/Zr = 0.5) as a mineralizer (Ni/ZrO₂ (SC0.5)), ascribed to higher Ni dispersion and smaller average crystallite size of Ni. With respect to both activity and stability, the sodium acetate can be selected as a suitable mineralizer for the preparation of excellent ZrO₂ support. Furthermore, the increasing N_SAc/Zr from 0.5 to 2.0 leads to an increase in surface area but a decrease in pore diameter and pore volume, which endows the Ni/ZrO₂ (SAc2.0) catalyst with much larger average crystallite size of Ni but much worse Ni dispersion than Ni/ZrO₂ (SAc0.5). As a result, Ni/ZrO₂ (SAc2.0) shows much lower catalytic activity than Ni/ZrO₂ (SAc0.5). Moreover, the Ni/ZrO₂ (SAc2.0) catalyst shows worse Ni sintering resistance than Ni/ZrO₂ (SAc0.5) owing to its weaker NiZrO₂ interaction confirmed by H₂-TPR results, which endows it with lower catalytic stability although it has higher coke deposition resistance.     

飞机座舱气动式压力调节系统稳定性仿真研究

建立某型飞机座舱气动式压力调节系统工作在恒压调节区时的数学模型,并进行系统的稳定性和动态性能的仿真试验研究。结果表明：所提出的压力调节系统的稳定性和动态性能较好。分别分析气密座舱体积和控制腔体积对系统稳定性和动态性能的影响。研究结果为深入了解飞机座舱气动式压力调节系统的工作原理、工作过程、稳定性和动态性能提供了参考。