雨量预报方法的评价     

傅骏  李传伟 《四川工程职业技术学院学报》2006,(4):38-41

本论文讨论雨量预报的方法准确性的评价问题。我们利用最小二乘法、体积模型、等级换算模型对数据进行处理,得出方法二比方法一的准确性略高。最后我们对得到的数据进行概率分析与方差检验,结果比较吻合。  相似文献   

对全国体育学院足球通用教材中"局部进攻战术分类"的探讨     

张孝平  高大山 《首都体育学院学报》2006,18(5):107-108

为了提高足球教学与训练的效果和足球教材建设。本文对现有教材的版本进行了研究，结合多年的教学训练经验，对“足球局部进攻战术分类”进行了探讨，分析了足球局部进攻战术有传切配合、二过一配合、交叉掩护配合和三人配合等方法。其中传切配合运用最多，二过一配合效果较好，三人配合形式多样，变化灵活。  相似文献   

非齐次等式约束线性回归模型回归系数的综合条件岭估计     

农秀丽  彭展声 《科技通报》2012,28(2):4-6,9

提出非齐次等式约束线性回归模型回归系数的一个新的有偏估计,即综合条件岭估计,讨论了综合条件岭估计的性质,在一定的条件下,综合条件岭估计的样本总方差、均方误差、均方误差矩阵均分别小于约束最小二乘估计的相应误差.在综合条件岭估计下,条件岭估计和条件根方估计为其特例,从而统一了条件岭估计和条件根方估计的理论.  相似文献   

新闻导语首因效应与核心因素     

刘祖斌 《柳州职业技术学院学报》2006,6(4):90-92

新闻导语是新闻文本的重要组成部分,它具有导引读者、引人注意的首因效应。新闻导语要力求简洁,突出重点,强调表现“部分要素导语”。选择和确立什么因素作为核心要素是新闻导语写作的关键。  相似文献   

三元函数极值的探索     

宿娟 《四川教育学院学报》2013,(11):116-118

函数极值的存在性及判别方法是微分的重要应用之一.文章就三元函数给出了判别极值的存在的一个必要条件和充分条件.  相似文献   

几种防晃电措施在化工企业电气系统中的应用     

郁娟 《南通职业大学学报》2013,27(1):101-104

电网的晃电对连续型管道化企业的正常生产危害极大。文章提出,针对不同情况,可采取分闸线圈线路、延时技术、UPS稳压设备、控制柜分批启动技术、电动机保护器、合理设置参数等措施,有效避免因晃电产生的跳闸停机,提高企业的经济效益。  相似文献   

新型储油罐测量方法的研究     

任潘龙 《兰州石化职业技术学院学报》2013,13(1):9-13

为解决旧式储油罐部分高度无法测量的问题,利用定积分法,对新式储油罐标定方法进行研究,并在一定误差范围内,对罐容表重新进行标定。  相似文献   

Factors affecting the effectiveness and use of Moodle: students' perception     

Vesna Damnjanovic  Ivana Mijatovic 《Interactive Learning Environments》2013,21(4):496-514

The purpose of this research paper is to identify the factors affecting the effectiveness of Moodle from the students' perspective. The research hypotheses derived from the suggested extended Seddon model have been empirically validated using the responses to a survey on e-learning usage among 255 users. We tested the model across higher education institutions in Serbia, Lithuania, and Bosnia and Herzegovina. These responses have been examined through partial-least squares. The obtained results strongly support 16 of the 23 research hypotheses for the proposed e-learning model. We defined eight factors (behavioral intention to use in the future, communicativeness, format, information quality, performance outcome, perceived usefulness, satisfaction and system quality) in the initial theoretical e-learning model. Unexpectedly, system and information quality did not influence satisfaction, while communicativeness had the highest significant impact on performance outcome. Satisfaction had a significant effect on behavior intention and accounted for 68.4% of the variance in this area. The findings offer an insight into those factors that are likely significant antecedents for planning and implementing a Moodle e-learning system to enhance student-learning effectiveness.  相似文献   

The Partial Credit Model and Generalized Partial Credit Model as Constrained Nominal Response Models,With Applications in Mplus     

Anne Corinne Huggins-Manley  James Algina 《Structural equation modeling》2013,20(2):308-318

The purpose of this article is to demonstrate constraining the nominal response model in Mplus software to calibrate data under the partial credit model (PCM) and generalized partial credit model (GPCM). Currently, many researchers are uncertain if the PCM and GPCM can be estimated within Mplus. Through model constraint commands in Mplus, we demonstrate that both models can be estimated in recent versions of this software. We present an example of this approach with data from 522 respondents on a subset of items from the Math Self-Efficacy Scale (Betz & Hackett, 1983). It is demonstrated that the presented model code is a viable way of estimating the models in Mplus.  相似文献   

多元函数在一元微积分中的一些应用     

郑平  赵洁  李碧琦 《甘肃高师学报》2013,18(2):117-118

举例说明了如何把多元函数的一些性质应用于解决一元微积分的问题中.如用多元函数的偏导解决一元隐函数的求导问题,用多元函数的拉格朗日乘数法来求一元函数的极值,用二重积分求平面图形的面积,三重积分求旋转体的体积等等.  相似文献