木素降解菌Phanerochaete chrysosprium营养条件对麦草木素降解选择性指数的影响

利用正交回归试验设计方法研究Phanerochaete　chrysosprium选择性降解麦草原料木素的营养条件，初步探讨了影响因素交互作用对白腐菌选择性指数的影响，提出优化条件。实验发现菌处理麦草原料洗脱液的A205吸收值与降解后木素失重线性相关(R＝0．9776)，可为白腐菌处理纤维原料效果的快速评估提供依据和方法。     

销-轴型热处理吊挂工装优化设计

基于对大件热处理销轴一轴型吊挂工装的均布载荷、两点载荷及最大载荷的受力分析,综合考虑了销轴的抗弯强度、抗剪应力和吊挂工艺头轴颈抗拉强度等影响因素的计算和选择,用计算机进行了参数的优化设计,最后得到了简明精确的技术参数设计公式,与生产经验取值相比较,节约了钢材,又便于实际生产中应用,具有较大的经济及社会效益.     

梅州客家方言粤语词的文献研究

采用文献研究的方法,以1964年、1995年两个版本的《汉语方言词汇》中的梅州客家方言粤语词为研究对象,从借用领域、借用方式、借词的语法结构等几个方面来探讨《汉语方言词汇》梅州客家方言粤语词的特点.     

Vakhnenko-Parkes方程的李对称及其精确解

运用李对称分析方法和广义对称方法,获得了Vakhnenko-Parkes方程的对称群.证明此方程的李代数的一维最优子代数有4个元素,在伴随表示作用下,证明了该最优系统的最优性.此外,运用动力系统理论,获得了该系统的分岔与精确解.     

兰州地区不同分辨率DEM提取地面坡度的转化方法

坡度提取时由于DEM本身特性,坡度不可能作为连续变量提取存储.现在传统的做法是按照需要将坡度分类,然后统计分析,找到不同分辨率的DEM提取坡度的转换方式.在不同分辨率提取坡度研究中,一般做法是采集大量数据,然后做归纳,得到需要的结论;如果先进行演绎推理,建立数学模型,不同分辨率坡谱转化将不依赖于某种具体地形.本文的方法是先按照地形的本身特性建立模型,然后用实际采集的数据进行检验,找到可行之处和不足之处,为以后的更进一步研究提供参考.     

Observational evidences for the speed of the gravity based on the Earth tide

We have found that the current practical Newtonian formula for the gravity tide of the Earth implies a hypothesis that gravity travels at the speed of light; furthermore, we have derived and solved the propagation equation of gravity using the observation data of Earth tides from Shiquanhe and Wushi, after correction of phase lag due to the anelasticity of the Earth, and found that the speeds of gravity are from 0.93 to 1.05 times the speed of light with a relative error of about 5%. This provides first set of strong evidences to show that the speed of gravity is the same as the speed of light.     

数学智能型教学方法初探

以探求智能教育为目的，以多元函数极值理论为基础，以探讨运用方向导数和全微分判定二元函数极值的教学实验为专题，对数学教学的智能型方法进行了初步的探索，旨在拓宽学生思路，培养学生的开拓创新意识。     

On convergence for trigonometric interpolation of analytic function

In this paper, we give a necessary and sufficient condition of sequence of nodes, such that, the error of trigonometric interpolation for analytic function converges to 0. Foundation item: Supported by the Science Foundation of SEC of China and Foundation of Wuhan University Biography: LIU Hua (1971-), male, PH. D candidate, Research interest is in complex analysis.     

程序树层次化结构统计模型及MOSES改进算法

为提高MOSES效率,提出了一种新的程序树层次化结构统计模型.该模型通过统计分析同类群,自动发现子树特征来指导优化.该模型不需要hBOA算法那样对变量集合进行建模,也不需要像MRTS算法那样遍历小规模的种群来发现潜在的有指导意义的子树.通过解决人工蚂蚁问题对算法进行了测试,结果表明改进后的MOSES算法更加高效.     

The tectonic uplift of the Hua Shan in the Cenozoic

Six granite samples were collected from six difference elevation locations at the Hua Shan in a main ridge of the Qinling Mountain. Apatite and zircon separated from these six samples were dated by the fission track technique. An assessment of the Cenozoic uplift or exhumation rate was obtained from the altitude difference of sampling samples dated by fission track, and from the difference of fission track dates of both apatite and zircon for a sample. The preliminary results suggest that the beginning of uplift of the Hua Shan was as early as 68.2 MaBP and the uplift rates for different periods are 0.02–0.19 mm/a (from the elevation difference) or 0.12–0.16 mm/a (from two mineral fission track dates). The average uplift rate is 0.12 mm/a (from the elevation difference) or 0.14 mm/a (from two mineral fission track dates). The uplift of the Hua Shan might accelerate since (17.8±2.0) MaBP, and the average uplift rate is about 0.19 mm/a.