劈裂注浆在加固污水管道软基中的应用

在沿海地区的市政地下工程中,应用劈裂注浆技术加固其软粘土地基,可以有效地消除软土地基不均匀沉降对地下结构的破坏。     

端扩锚筋碎石桩的设计应用

本文主要讨论软土地基液化问题与污水处理构筑物抗浮和承载力要求的解决方法 ,总结设计、施工、检测经验 ,以利相关工程参考借鉴     

单段一次通过加氢异构裂化装置首次开工

本文介绍了催化剂分层装填,把脱金属、加氢精制和加氢异构裂化集于一个反应器中进行的单段一次通过加氢异构裂化工艺的首次开工情况。以劣质的孤岛VGO为原料,生产出产率为9.14w％的石脑油、26.92w％的喷气燃料、17.23w％的柴油,实现了增产中间馏分油的目标;未转化尾油是优质的催化裂化和蒸汽裂解制取乙烯的原料,化学耗氢量为202m~3(标准状态)/m~3进料。     

共同沟内燃气泄漏扩散规律的数值仿真

在模型试验的基础上, 数值模拟了在带有燃气管道的共同沟中燃气泄漏后的浓度分布. 对比模型试验结果发现, 在气体泄漏点的一定范围内, 标准k-ε湍流计算模型能够模拟燃气的泄漏, 数值计算的燃气浓度能够满足工程精度要求.     

超声波功率和pH值对Y掺杂纳米Ni(OH)2结构与性能的影响

采用超声波沉淀法制备了Y掺杂纳米Ni(OH)2,研究了超声波功率和溶液pH值对材料结构、粒径及电化学性能的影响.结果表明,不同超声波功率制备的样品均为α和β混合相结构,其中α-Ni(OH)2的比例随功率增大先增加后减少,粒径随功率增大先减小后增大.溶液pH值对Ni(OH)2晶相形成起重要作用,较低的pH值有利于α-Ni...     

超声波沉淀法制备Y掺杂纳米多相Ni(OH)2及其性能研究

采用超声波沉淀法制备了不同摩尔比例Y掺杂氢氧化镍,对其粒度分布、结构及电化学性能进行了测试分析。XRD测试表明,样品均为α和β相混合结构的Ni(OH)2。激光粒度测试表明,样品均为纳米颗粒,且分布均匀,平均粒径在50~80 nm之间。分别将制备的样品以8%比例与工业用微米级球镍混合制成复合镍电极,电极的可逆性和充电效率均随Y掺杂比例增大先提高后下降,Y含量 1.17%时,其电极可逆性和充电效率达到最佳,放电比容量达到最大,0.1和0.5 C倍率下的比容量分别达到370和358 mAh/g,且具有较低充电电压和较高放电平台,该结果比目前市售镍氢电池比容量(230~250 mAh/g)高48%~60%。对加超声波和不加超声波制备的样品性能进行了比较     

Study on the preparation and electrochemical performance of rare earth doped nano-Ni（OH）2

Multiphase nano-Ni(OH)2 doped with Y or La was prepared by supersonic co-precipitation method. The crystal morphology, structure and particle size were characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD) and particle size distribution (PSD). The electrochemical performance of samples was investigated by electrochemical workstation and battery tested system. The results indicated that micro-morphology and grain size were changed with the changing of supersonic power, pH values and doping elements. The morphology of Y doped sample was from the flake-like to the needle-like with the increase of supersonic power; Particles were from quasi-spherical particles into needle-like with the increase of pH values; As the supersonic power increased, the proportion of α-Ni(OH)2 increased initially and then decreased. pH value was very important to the formation of crystalline phase. Lower pH value was beneficial to the formation of α-Ni(OH)2. However, the pH values had a slight effect on the reaction reversibility. Complex electrodes were prepared by mixing 8 wt.% nickel hydroxides with commercial micro-size spherical nickel. The discharge capacity of electrodes increased initially and then decreased with the increase of supersonic power. When the supersonic power was 60 W and the pH value was 9, the sample had the largest dis-charge capacity (358 mAh/g) at 0.5 C rate, which was 122.7 and 76 mAh/g higher than the spherical nickel electrode and La doped sample electrode, respectively.