挡土墙填土曲线破裂面的地震主动土压力分析

在地震作用影响下，墙后填土处于极限平衡状态时，假定破裂面为一条通过墙趾的旋轮线。从墙后土楔中取出一微薄水平层，研究其在水平惯性力下的平衡，得到的地震土压力分布和土压力合力作用点位置均与实验结果相吻合。     

稀土混合物水溶液中囊泡的形成

依据柠檬酸的螯合作用和乙二醇的空间位阻效应，获得了稀土混合物囊泡。并利用ＩＣＰ、ＴＥＭ、ＦＳ等仪器对囊泡的性能进行了研究，最后对囊泡的形成机理进行了讨论。     

WTG420铁路罐车用钢的组织结构和力学性能分析

分析了ＷＴＧ４２０铁路罐车用钢的组织结构和力学性能。提出了冶炼与轧制的技术关键，其一，添加稀土元素改善钢中夹杂物；其二，采用控轧控冷使铁素体晶粒细化。     

Role of RE and Mg on Graphitization of Spheroidal Graphite Malleable Cast Iron

ＲｏｌｅｏｆＲＥａｎｄＭｇｏｎＧｒａｐｈｉｔｉｚａｔｉｏｎｏｆＳｐｈｅｒｏｉｄａｌＧｒａｐｈｉｔｅＭａｌｌｅａｂｌｅＣａｓｔＩｒｏｎ￥ＬｉｕＪｉｎ－Ｈａｉ（ＨｅｂｅｉＩｎｓｔｉｔｕｔｅｏｆＴｅｃｈｎｏｔｏｇｙ，Ｍｉａｎｊｉｎ３００１３０，Ｃｈｉｎａ）...     

含钇奥氏体基堆焊焊条堆焊层研究

针对高温、磨损、热疲劳工况下服役零件的失效，研制了一种含稀土元素钇的奥氏体基沉淀强化型堆焊焊条，并对堆焊层组织与性能进行了较系统的研究。     

Chemical States of Lanthanum in Carbonized La2O3-Mo Thermionic Cathode Materials

The chemical reaction between lanthanum oxide and molybdenum carbide was studied by thermodynamic calcu-lation, thermal analysis and in-situ X-ray Photoelectron Spectroscopy. The theoretical results show that at the environment allowing for the evaporation of lanthanum, such as in high vacuum, La2O3 in the La2O3-Mo materials can be reduced to metallic lanthanum by molybdenum carbide (Mo2C). To confirm the conclusion, many analysis methods such as XRD, SPS, and TG-DTA were taken. The experimental results show that the chemical state of lanthanum changes during heat-ing. It was proved, for the first time, that reacted metallic lanthanum appears at the surface of this kind of material at high temperature.     

铸型尼龙改性的研究进展

铸型尼龙产品广泛地用于各种机械零件，改性后的铸型尼龙，可克服其自身的缺点，满足工业应用的要求。文章就我国近年来在铸型尼龙改性研究方面的情况及不同的改性方法做了详细的介绍。     

La2O3对激光熔覆TiC/Ni基复合涂层的影响

利用CO2横流激光器在低碳钢基体表面熔覆含稀土氧化物La2O3的镍基TiC金属陶瓷复合层,研究了不同含量的La2O3对激光熔覆镍基金属陶瓷复合层组织及性能的影响。结果表明,加入适量的稀土氧化物La2O3可有效改善激光熔覆复合层的显微组织,减少复合层中的裂纹、孔洞、夹杂;加速复合层中TiC颗粒的溶解和改善TiC颗粒的形状变化,同时,熔覆复合层的耐磨性和耐蚀性明显提高。     

Influence of Lanthanum on Fluorescence Properties of Ag-BaO Thin Films

Ag-BaO thin films doped with lanthanum were prepared by vacuum deposition. Compared with the normal Ag-BaO thin film, there is almost no change with the shape and the peak site of the fluorescence spectrum; however, fluores-cence emission strength of the whole observation band(325 -600 nm)increases about 40%, and the increase of short wavelength range is more remarkable than that of long wavelength range, which we named “blue-stronger“ phenomenon. Analytic results show that, with the forming of intermetallic compounds between silver and lanthanum, the 4f-state energy levels lie just below the Fermi level within 5 eV. It is the energy exchange between the 4f energy levels and the conduction band that causes the increase effect of fluorescence emission, and it is the optical absorption cross section of 4f electron, which increases with the increase of energy of incidence photon, that gives rise to the “blue-stronger“ phenomenon.     

Tb掺杂对纳米TiO_2光催化活性的影响

以溶胶-凝胶法制备了纳米TiO2和掺杂Tb的TiO2(Tb-TiO2),用X射线衍射、示差扫描量热、热重分析、红外光谱和荧光光谱等技术对纳米TiO2和Tb-TiO2的结构进行了表征;考察了以纳米TiO2及Tb-TiO2为催化剂光催化氧化环己烷合成环己酮和环己醇的情况。表征结果表明,掺杂Tb后明显抑制了TiO2中锐钛矿相向金红石相的转变,提高了TiO2催化剂的热稳定性,晶格发生了膨胀现象,晶格膨胀可有效降低光生载流子的复合几率,减小晶粒尺寸,提高光催化活性;光催化氧化环己烷的实验结果表明,与TiO2催化剂相比,Tb-TiO2催化剂的环己烷转化率和环己酮、环己醇的选择性大幅度提高,表明Tb-TiO2催化剂的光催化活性和光催化效率提高。