排序方式: 共有14条查询结果,搜索用时 15 毫秒
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介绍了一种新型马氏体耐热钢 ZG1Cr10MoVNbN 的焊接工艺。通过分析 ZG1Cr10MoVNbN 材质铸钢的焊接特性,并通过工艺评定验证,确定了合理的焊接工艺,满足了焊缝的常温及高温力学性能。 相似文献
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德国建造规划的技术框架 总被引:2,自引:0,他引:2
本文基于建造规划的课题研究,以建造规划中的重要符号——建造窗口为核心,系统总结了建造规划的技术框架,并进而详细剖析了其主要技术特点。 相似文献
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Adsorption and reduction of nitrate in water on hydrotalcite-supported Pd-Cu catalyst 总被引:2,自引:0,他引:2
The hydrotalcite-supported Pd-Cu catalysts were successfully prepared by the impregnation or coprecipitation method, and their adsorption and catalytic reduction activity for nitrate in water were evaluated. The catalysts were characterized by X-ray diffraction (XRD) and surface area (BET) analysis. The results demonstrated that hydrotalcite-supported Pd-Cu catalysts could significantly adsorb nitrate ions, and then, effectively catalytically reduce them. The excellent adsorption ability for nitrate resulted from the regenerated layer structure of calcined hydrotalcite catalyst in nitrate aqueous solution. Nitrate was forced into the interlayer space and adsorbed on the external surface. The adsorption kinetics and the adsorption isotherm could be well described by pseudo-second-order model and the Langmuir model, respectively. The comparison of catalytic reduction with the adsorption for nitrate indicated that catalytic hydrogenation activity for nitrate increased with increasing adsorption capacity; nitrate reduction on hydrotalcite-supported Pd-Cu catalysts was a consecutive and dynamic adsorption and catalytic hydrogenation process. In addition, the catalyst obtained by coprecipitation method, with intact regeneration of hydrotalcite structure and a high dispersion of active metals, hold higher adsorption and catalytic activity than that prepared by co-impregnation method. 相似文献
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本文分析并指出了《架空送电线路杆塔结构设计技术规定》(DL/T5154-2002)中关于计算输电塔风振系数条文中存在的问题,引进了基于输电塔气弹模型风洞试验数据得到的输电塔顺风向1阶广义风荷载谱模型,并对其进行了地貌和振型修正。详细推导了基于修正的输电塔1阶广义风荷载谱计算其风振系数的方法,采用该方法计算了某大跨越输电塔的风振系数,并且与基于准定常理论采用Daven-port谱和规范方法计算得到的风振系数进行比较,所得结论具有重要的参考价值,可以直接为输电线路工程设计提供借鉴。 相似文献
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爆炸容器动态径向变形非接触测量技术 总被引:1,自引:0,他引:1
基于激光多普勒效应的动态测量技术具有精度高、信噪比高、动态响应快、线性好、量程范围大和非接触等优点.为获得爆炸容器径向变形参数,设计非接触激光多普勒纵向位移测量系统.采用外差式光路结构,实现被测目标运动方向的辨别,提高抗干扰能力;利用高斯光束理论和束腰特性优化光路结构,使高斯光束束腰聚焦在爆炸容器被测表面上,实现最小聚焦光斑,提高光信号的强度和信噪比;根据爆炸容器径向变形的特点,研究相应的数字滤波和频谱分析方法,实现高速变化位移的动态测量.系统的位移测量范围为-30 mm~+30 mm,速度变化范围为-10 m/s~+20 m/s,测量距离为4.5 m.爆炸容器在内部爆炸载荷作用下的径向变形测试结果表明测试系统性能是可靠的. 相似文献
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塑料包装袋保鲜果蔬的研究 总被引:6,自引:0,他引:6
本文对果蔬的生理特征、保鲜机理和保鲜技术进行了比较系统的研究。结果表明,适宜的塑料包装袋可以延缓果蔬衰老、减少失重率、延长果蔬贮藏期、维持良好的贮藏质量和降低果蔬的变质率。 相似文献