重力加速度的分布

从重力场中的高斯定理出发 ,讨论地球表面、地球内部和地面上空重力加速度的分布     

Effects of Rare Earth and Hot Pressing Sintering Temperature on the Transverse Rupture Strength of Fe-based Diamond Composites

Effects of sintering temperature in hot pressing, t yp es, states and amounts of rare earth as well as TiH 2 on the transverse rupture strength (TRS) of Fe-based composites are studied by means of orthogonal test and variance analysis in this paper. It is found that sintering temperature has a significant effect on the TRS of Fe-based diamond composites. The optimal sin tering temperature is 780～860 ℃. On the contrary, the effects of RE additi v es on values of TRS of the diamond composites have on di...     

稀土高效多元素增长剂在鲜食油菜上的应用效果初报

为了探讨稀土元素对油菜生长的影响 ,选用稀土高效多元素增长剂—植乐 ,在皖油 9号油菜上进行了喷施和拌种处理 ,并以清水为对照。结果表明 ,油菜应用稀土元素后 ,根粗、根长、须根数、叶绿素含量、Vc含量都较对照明显提高 ,方差分析达显著或极显著差异水平 ;油菜鲜重增产 36 %以上。稀土元素对油菜有明显的增产效果。     

艺工结合的教学模式对人才素质结构的影响

从艺术与科学发展的过程、人类自然情况、作品或项目在形式上内容上的统一等方面，论述了艺术与科学对创新人才培养的影响。这对提高教学质量，满足人才市场的需求有着现实的意义。     

纳米La3+/TiO2光性能的研究

采用溶胶-凝胶法制备出了不同La3+掺杂量、不同煅烧温度的La3+/TiO2的光催化剂,并对所制得的光催化剂进行了SEM、XRD、FT-IR表征;以亚甲基蓝为目标降解物进行光催化活性研究.结果表明,所得粉体为锐钛矿相纳米TiO2,且La3+掺杂后,纳米TiO2特征衍射峰宽化,强度降低,说明稀土La3+的掺杂能细化晶粒,稀土离子掺杂也有利于抑制高温时的TiO2晶型由锐钛矿向金红石型的转变;以亚甲基蓝为目标降解物的光催化实验表明,在500℃煅烧,含量0.5%La3+/TiO2的催化剂,加入2mL助催化剂,提供了光催化基元反应的中间介质羟基自由基,使基元反应中的活化能降低,反应更易进行,在三基色节能灯照射3.0h,降解率可77.56%,时间短见效快.     

甘肃省体育旅游企业经营状况的研究

运用问卷调查、逻辑分析和比较等方法对甘肃省体育旅游企业的经营状况进行了研究,认为：国有企业存在员工数量超编、专业人才不足、管理人员过多、全员的文化素质偏低、干群关系紧张等突出问题;股份制及私有制企业管理层的组织能力、决策能力优于公有制企业．同时,公有制企业的经济效益水平与旅游业整体向前发展的趋势相比是在下降,而股份制及私有制企业的经济效益仍有潜力可挖．另外,企业对树立自己的形象、提高知名度缺乏自主性和独立性,过多地依赖地方对整体旅游形象的提高,企业的主产品使用年限平均在7a以上,对主产品与效益及可持续发展的重要性认识不够深刻．     

Geochemical character and material source of sediments in the eastern Philippine Sea

Based upon analyses of grain-size, rare earth element （REE） compositions, elemental occurrence phases of REE, and U-series isotopic dating, the sediment characteristics and material sources of the study area were examined for the recently formed deep-sea clays in the eastern Philippine Sea. The analytical results are summarized as follows. （1） Low accumulation rate, poor sorting and roundness, and high contents of grains coarser than fine silt indicate relatively low sediment input, with localized material source without long distance transport. （2） The REE Contents are relatively high. Shale-normalized patterns of REE indicate weak enrichment in heavy REE （HREE）, Ce-passive anomaly, and Eu-positive anomaly. （3） Elemental occurrence phases of REE between the sediments with and without crust are similar. REE mainly concentrate in residual phase and then in ferromanganese oxide phase. The light REE （LREE） enrichment, Ce-positive anomaly, and Eu-posiUve anomaly occur in re-sidual phase. Ferromanganese oxide phase shows the characteristics of relatively high HREE content and Ce-passive anomaly. （4） There are differences in each above mentioned aspect between the sedi- ments with and without ferromanganese crust. （5） Synthesizing the above characteristics and source discriminant analysis, the study sediments are deduced to mainly result from the alteration of local and nearby volcanic materials. Continental materials transported by wind and/or river （ocean） flows also have minor contributions.     

The Necessity of Teaching Oral Skills in the Classroom

Today teaching oral communicative skills has gradually become an acknowledged approach in China.As English teachers,we should create a spoken English learning environment and encourage students to practice more.This paper advances the necessity of oral skills teaching in the classroom.While teaching,we should be aware of the cultural differences between the east and the west and find appropriate methods to engage learners in appropriate conversations.Then we can achieve the final purpose of teaching the target language.     

湿化作用对粘土斜心墙坝应力变形影响

在坝体粗粒料湿化变形室内试验研究成果的基础上,结合粘土斜心墙坝蓄水变形及实际运行中存在的问题,进行了有限元仿真计算.分析结果表明,在蓄水湿化变形后,坝体的最大沉降区域向心墙上游侧偏移,上游侧坝体围压显著降低,坝体上游侧应力水平增大.这与大坝变形规律较吻合,由此可知,文中所示方法是可行的,研究成果具有一定的工程参考价值.     

工学交替培养模式下学生实习实训管理分析——以天津职业大学酒店管理专业为例

在国家高职示范校建设中。工学交替已成为加强学生应用能力培养的重要模式。但与此同时,很多学生实习实训管理问题也凸显出来。天津职业大学酒店管理专业以学生实习实训管理问题为例,提出职业岗位需求的动态性、市场准入的不规范性、学生面对需求的不适应性以及校企沟通的不通畅性等方面的问题,并对进一步改进学生实习实训管理,提出了柔性教学管理,健全实训管理制度以及转变学生实习观念等三项具体措施。