提高大学生课堂昕课兴趣的探讨与实践

课堂教学由教师和学生组成,教师与学生默契配合是调动学生学习积极性的重要因素。丰富的教学内容,生动活泼的讲课节律,活跃的课堂气氛,科学的考试方法等,均影响着学生的听课兴趣。     

隐语研究的认知语用学视角

前人对隐语进行了大量的、多学科的研究,但是从对隐语的研究总况和现代语言学研究的发展趋势来看,从认知语用学角度对隐语进行的研究将是崭新的视角,这一研究新视角的引入不仅是必要的,也是可行的。本文首先对隐语进行简单的说明,再对认知语用学研究视角的必要性和可行性分别进行分析和说明。     

Detecting parameter shift in garch models

This paper applies recent theories of testing for parameter constancy to the conditional variance in a GARCH model. The supremum Lagrange multiplier test for conditional Gaussian GARCH models and its robustified variants are discussed. The asymptotic null distribution of the test statistics are derived from the weak convergence of the scores, and the critical values from the hitting probability of squared Bessel process.

Monte Carlo studies on the finite sample size and power performance of the supremum LM tests are conducted. Applications of these tests to S&P 500 indicate that the hypothesis of stable conditional variance parameters can be rejected.     

Z_P群中N维广义正方体上的哈密顿回路

设Z_P={1,2,…,P-1,0},在模P的加法运算下,Z_P是一个群。Z_P上定义n维广义正方体,其顶点集为{(x_1,x_2,…,x_n):x_i∈Z_P.i=1,2,…,n},两个顶点x和y之间有一条棱,当且仅当sum from i=1 to n丨x_i-y_i丨=1 mod(P)。在这个定义下,本文证明了对任意P≥2和n≥2,Z_P中n维广义正方体上存在一个经过所有顶点的哈密顿回路。文中给出了一些例子作为应用。     

汽轮发电机组轴系磁阻尼器抑振方案优选计算分析

采用有限元与轴承及磁阻尼器动特性线性简化模型建立大型汽轮机转子系统不平衡振动响应计算模型;选择典型不平衡状态,采用多种磁阻尼器布置方案对BBC公司汽轮发电机组轴系振动的抑振效果进行分析对比优选,结果表明在中压转子段采用大阻尼参数磁阻尼器抑振效果最佳。     

电子信息专业词典的研究与应用

介绍了一种电子信息专业词典。该词典在0FFICE的ACCESS软件平台上设计开发,成为一种专业术语的数据库系统。该系统具有编辑和查询两大功能,录入了上万条电子信息专业词汇。利用系统的编辑功能,还可以对词汇动态更新,弥补了一般专业词典更新缓慢的缺陷。词典结合教学内容对词条的专业解释,使词典成为某种意义上的电子专业百科书,有助于拓展学生的专业知识和教学工作。     

一个数据流查询系统的设计与实现

就目前大多数数据流查询处理过程中可能出现的一些问题，根据数据流处理的特点和要求，提出了新的查询处理结构，实现了数据共享及多流多查询环境下查询的处理．     

块Jacobi迭代阵的收敛性

研究大型线性方程组迭代解法中分块ＪＡＣＯＢＩ迭代阵的收敛性。采用块矩阵分析方法和谱半径降维估计法得到块Ｊａｃｏｂｉ迭代阵收敛的实用充分条件。     

On estimating census undercount in small areas

"Net undercount rates in the U.S. decennial census have been steadily declining over the last several censuses. Differential undercounts among race groups and geographic areas, however, appear to persist. In the following, we examine and compare several methodologies for providing small area estimates of census coverage by constructing artificial populations. Measures of performance are also introduced to assess the various small area estimates. Synthetic estimation in combination with regression modelling provide the best results over the methods considered. Sampling error effects are also simulated. The results form the basis for determining coverage evaluation survey small area estimates of the 1900 decennial census."     

Institutional Voids,Economic Adversity and Inter‐firm Cooperation in an Emerging Market: The Mediating Role of Government R&D Support

This paper examines the mediating mechanism of the relationship between institutional voids (IVs) and inter‐firm cooperation and the moderating role of economic adversity in the context of small and medium‐sized enterprises (SMEs) based in emerging markets. The hypotheses are tested using time‐lagged survey data from 214 SMEs in Ghana. The findings provide support for the hypotheses by showing that: (1) IVs positively influence the use of government research and development (R&D) support; (2) the use of government R&D support mediates the relationship between IVs and inter‐firm cooperation; and (3) economic adversity positively moderates the relationship between IVs and the use of government R&D support. The findings contribute to understanding the role of IVs in inter‐firm cooperation. The wider implications for theory and practice are examined.