高速重轨矫正圈用9Cr2MoRE钢的开发研究

通过添加不同含量的稀土元素,对比研究稀土含量对9Cr2Mo钢奥氏体晶粒度、相变点、抗拉强度及耐磨性的影响.研究结果表明,稀土元素可以有效细化9Cr2Mo钢的奥氏体晶粒,当稀土加入量为0.10%时,晶粒长大速率降低最明显.添加质量分数为0.1%的稀土后,9Cr2Mo钢的抗拉强度明显提高,塑性和延展性也有所改善.加入稀土元素后,9Cr2Mo钢在磨损过程中可以避免出现大块疲劳剥落现象,提高了耐磨性.     

Community-Based User Domain Model Collaborative Recommendation Algorithm

Collaborative Filtering (CF) is a commonly used technique in recommendation systems. It can promote items of interest to a target user from a large selection of available items. It is divided into two broad classes: memory-based algorithms and model-based algorithms. The latter requires some time to build a model but recommends online items quickly, while the former is time-consuming but does not require pre-building time. Considering the shortcomings of the two types of algorithms, we propose a novel Community-based User domain Collaborative Recommendation Algorithm (CUCRA). The idea comes from the fact that recommendations are usually made by users with similar preferences. The first step is to build a user-user social network based on users’ preference data. The second step is to find communities with similar user preferences using a community detective algorithm. Finally, items are recommended to users by applying collaborative filtering on communities. Because we recommend items to users in communities instead of to an entire social network, the method has perfect online performance. Applying this method to a collaborative tagging system, experimental results show that the recommendation accuracy of CUCRA is relatively good, and the online time-complexity reduces to O.n/.     

浅谈饭店顾客期望管理的策略

饭店业作为服务业是与顾客进行交互最多的行业之一。阐述了顾客期望理论,分析了饭店顾客期望的影响因素,并提出了饭店顾客期望的管理策略。     

李共形代数与共形模

探讨了李共形代数和形式分布李代数两者之间的关系.从而可由形式分布李代数(g,F)得到李共形代数Conf(g,F);反之,可由李共形代数A得到形式分布李代数(LleA,A).此外,通过对李共形代数A的共形模M作用,构造了相应李代数LieA的模V(M),为李共形代数的表示论在研究无限维李代数的表示论中的运用奠定了基础.同时对Vimsom共形代数在 [ ]上自由且秩为1的共形模进行了分类.     

Regularization strategy for the Cauchy problem of Laplace’s equation from the viewpoint of regularization theory

Within the framework of the regularization theory, a spectral regularization method is introduced and analyzed. The convergence estimate under an appropriate choice of regularization parameter is obtained. A numerical implementation is described. Numerical examples show that the proposed method is effective and stable.     

Mechanochemical synthesis and high-capacity performances of transition-metal borides as aqueous anode materials

Transition-metal borides MB0.5(M = Co,Mo,V) were synthesized by high-speed mechanical ball-milling of the corresponding elemental metals and boron,and investigated as aqueous anode materials.The as-synthesized borides can achieve an excellent discharge capacity,about twice that of their parent transition metals.The metal boride electrodes also exhibit polarizations about 100-300 mV lower than those of their parent metals.The galvanostatic discharge curve of CoB0.5 shows a single discharge voltage plateau as a result of simultaneous electro-oxidation of elemental cobalt and/or amorphous cobalt boride.Both MoB0.5 and VB0.5 show two well-defined voltage plateaus,corresponding to the electro-oxidation of the corresponding metal and boride.These results show that the coexisting transition metal and boride in the metal borides co-activate each other in the ball-milling process,thereby significantly enhancing their electrochemical performances.     

地质学专业英语词汇特点及构词研究

专门用途英语（ESP）学习及应用中,词汇的掌握是基础,也是要点和难点,起着举足轻重的作用。地质学专业英语是ESP中的一个重要分支,专业词汇量大、半专业词汇丰富、广泛使用派生词、复合词、缩略词并涉及众多相关学科。从词汇特点入手,对地质专业英语词汇进行构词法归类,进而找出行之有效的记忆方法,有利于广大地质学习者和工作者便捷的使用地质英语。     

高校管理人员工作倦怠感及其社会干预对策研究

目的探讨高校管理人员工作倦怠的成因并提出干预对策。方法采用工作倦怠量表和社会支持评估量表,对某省普通高校的管理人员共150名进行问卷调查。结果 1社会支持与工作倦怠各维度之间存在一定的相关性;2工作倦怠感中各维度在人口学特征上无显著性差异;3男性在主观支持上的分数显著低于女性(t=0.589,P0.05),青年在主观支持上的分数显著低于中年(t=-0.087,P0.05),中年在社会支持总分上的分数显著高于青年(t=0.682,P0.05),已婚在客观支持上的分数显著高于未婚(t=0.682,P0.05);4主观支持对情绪衰竭有显著的预测作用,解释率为6.4%,社会支持总分对工作态度有显著的预测作用,解释率为14.8%,客观支持对低成就感有显著的预测作用,解释率为19.5%。结论良好的社会支持为高校管理人员心理危机,提高管理人员自我的保健意识,均提供了重要的参考依据。     

三氮唑羧酸酯类席夫碱的合成及生物活性

从５－氨基－１Ｈ－１，２，４－三氮唑－３－羧酸出发，合成了７种５－氨基－１Ｈ－１，２，４－三氮唑－３－羧酸甲酯类席夫碱，对其产率，物理性持作了首次报道，采用ＵＶ，ＩＲ，＾１ＨＮＭＲ和元素分析等对化合物结构进行了初步表征，实验室生物活性测试表明此类化合物具有较好的生物活性。     

自蔓延高温合成及其复合材料新工艺的研究

由自蔓延高温合成技术制取的材料普遍具有孔隙率大的特点，而把ＳＨＳ工艺和熔融金属渗入技术结合可以制得致密度高的复合材料，复合材料性能测试结果表明，硬度提高了４４ＨＢ，相对耐磨性提高了８２％。