高速铁路无砟轨道板智能精调器的控制算法

针对高速铁路客运专线无砟轨道板的自动化精调问题,提出一种新型智能精调器.首先对整个智能精调系统进行了概括性的介绍;然后对其控制算法进行了详细说明,通过构建轨道板精调的数学模型,推导用于定位控制的冗余方程,构建了理论基础,并选取Trust-Region Dogleg优化算法进行仿真求解.仿真表明,此算法能够保证所有几何参数的可辨识性,且迭代过程具备较好的鲁棒性.考虑实际实际精调操作误差,选取多组水平的测量噪声进行参数辨识,分析了不同水平的测量噪声对辨识误差均方根的影响,在较大的测量噪声影响下,各点定位精度依然能够满足要求.该算法经过了多次现场试验,均取得了良好的应用效果.     

植物数量性状基因座（QTL）的作图与克隆

从QTL定位方法以及QTL精细定位和克隆等方面对植物数量性状遗传进行了综述。     

精细化工实验课程教学改革

阐述了精细化工专业实验的内容设置、教学方式改革及其考核方式。提出了专业实验内容应配合精细化工发展现状,专业实验的教学应突出培养学生的综合素质;考核方式的改革则客观检查了学生需要改进之处,有利于学生积极进行自我完善。     

提高精细化工工艺学教学质量的探讨

精细化工工艺学是一门重要的化工专业课程,为了让学生能更好地将理论和实际联系起来,结合自身的教学经验,对课程内容的安排、课件制作、课堂教学方法和节奏等方面进行了分析和探讨,并从学习方法和心理方面讨论了如何提高学生自主学习的兴趣和能力。     

思维导图在外籍生计算机文化课的应用研究

课堂教学中,教师和学生的核心活动是思维.不同国籍学生的思维习惯和文化基础是不同的,这种差异导致计算机文化课的教学较难.长期以来在对外教学领域以计算机文化为主题的研究非常罕见.教学过程大都延续国内学生教学模式,不适应对外教学工作.由中心主题开始表达发散性思维的工具"思维导图"运用在外籍生计算机文化教学中,有利于沟通不同国籍学生的思维习惯,可有效缓解外籍学习者因文化基础差异而产生的焦虑,并赋予更多的自主权,提高对计算机文化理解能力.以外国学生计算机文化基础课的思维导图为研究对象,探讨了思维导图在对外教学中的应用情况.教学实践表明,思维导图的课堂教学可以有效地促进师生互动,激发课堂的思维活动,提高课堂教学质量.     

滨海细砂路基沉陷机理

为了揭示滨海细砂路基沉陷机理,在实地调研和文献调研的基础上,通过路基湿度状态分析、重复动三轴试验和固结变形试验,研究基于淤塞效应的滨海细砂路基累积沉降量.研究结果表明:滨海细砂路基沉陷主要由细砂渗流—迁移—淤塞现象引发的细砂路基动力变形、固结变形以及砂土流失三部分组成;施工期间,高雨强条件下降雨入渗水流引发细砂迁移—淤塞现象,使得砂芯长时间处于高含水率状态;运行期间,淤塞且过湿的砂芯在重载交通和土压力长期作用下出现过量的动力变形和少量固结变形,从而引发细砂路基沉陷现象.     

Fine mapping of the red plant gene R1 in upland cotton(Gossypium hirsutum)

Sub 16 is a substitution line with G. hirsutum cv. TM-1 genetic background except that the 16th chromosome (Chr. 16) is replaced by the corresponding homozygous chromosome of G. barbadense cv. 3-79, and T586 is a G. hirsutum multiple gene marker line with 8 dominant mutation genes. The R ₁ gene for anthocyanin pigmentation was tagged in Chr. 16 in T586. The objective of this research was to screen SSR markers tightly linked with R ₁ by using the F₂ segregating population containing 1259 plants derived from the cross of Sub 16 and T586 and the backbone genetic linkage map from G. hirsutum×G. barbadense BC₁ newly updated by our laboratory. Genetic analysis suggested that the segregation ratio of red plants in the F₂ population fit Mendelian 1:2:1 inheritance, confirming that the red plant trait was controlled by an incomplete dominance gene. Preliminary mapping of R ₁ was conducted using 237 randomLy selected F₂ individuals and JoinMap v3.0 software. Then, a fine map of R1 was constructed using the F₂ segregating population containing 1259 plants, and R ₁ was located between NAU4956 and NAU6752, with only 0.49 cM to the nearest maker loci (NAU6752). These results provided a foundation for map-based cloning of R ₁ and further development of cotton cultivars with red fibers by transgenic technology. Supported by National Natural Science Foundation of China (Grant No. 30730067) and Programme of Introducing Talents of Discipline to Universities (Grant No. B08025)     

全局分析中非线性有限秩算子的局部线性化

运用广义逆理论和局部精细点已得出Banach空间中非线性映射的局部线性化定理,将此结果进行推广,考虑全局分析中,即Ck?Banach流形之间非线性有限秩算子的局部线性化问题.     

试论高等美术教育国际化与本土化的和谐发展

学科综合是21世纪高等教育的发展趋势。目前我国高等美术教育,一方面由于缺乏国际化教育理念,造成学科单一文理失衡;另一方面缺乏本土化观念,使西化覆盖本土造成中西文化失衡,这些都与当代高等美术教育的发展趋势不匹配。因此,应以学科综合的国际化教育趋势为出发点,尽快实现国际化与本土化的和谐发展。     

Reduction of 1-3 mm iron ore by H2 in a fluidized bed

The reduction of 1-3 mm fine powder of iron ore by H₂ was conducted in a lab-fabricated kg class high temperature fluidized bed. The results show that the differential pressure in the fluidized bed, which has small fluctuation with time, increases with the increase of gas flowing velocity. The utilization ratio of gas decreases when the reaction lasts longer time indicating that the reaction is faster at the beginning of reduction and becomes slower in the latter process. The higher the reaction temperature is, the higher the utilization ratio of gas is, but the difference of utilization ratio among the different temperatures becomes smaller with time. The utilization ratio of gas and the metallization ratio can reach 9% and 84% respectively at 750℃ for 20 min, which shows the reduction reaction by H₂ is very fast. The increase of metallization ratio with gas velocity performs quite good linearity, which shows that a higher velocity of reducing gas can be used to improve the productivity of the reactor when H₂ is used as reducing gas. With the increase of charge height, the metallization ratio decreases, but the utilization ratio of gas increases. The reaction temperature can be reduced to 700-750℃ from 800-850℃ when H₂ is used as reducing gas.