文理兼收专业数学教学方法的探讨

文章根据文理兼收专业的高等数学教学中存在的问题,从教学模式上进行了探讨,提出了注重数学思想的讲授,注重分层次教育、重点在课外,注重学生非智力因素的培养等措施。     

PMLSM驱动系统的数字控制系统的设计

针对永磁直线同步电动机(PMLSM)伺服控制系统的特点,提出一种永磁直线同步电动机驱动系统的闭环矢量控制系统实现方案,介绍了系统硬、软件结构.实验结果表明,该伺服系统具有自组织自学习能力强、快速跟踪、定位精确、鲁棒性强等特点.     

基于位置不确定性的多尺度空间方向关系相似性粗集模型

针对现有研究中没有考虑空间目标的不确定性对空间方向关系相似性的影响问题,借助粗集表达不确定性问题的优势,定义在空间方向关系锥形模型中空间方向关系的粗集表达方法,以此为基础提出基于空间对象位置不确定性的多尺度空间方向关系相似性的计算和粗集表达方法,使得多尺度空间方向关系相似性的取值在一个区间范围内变动,在多尺度空间方向关系相似性概念表达上更符合人类的认知逻辑.     

高平市灌溉现状及发展规划落实情况初探

结合高平市灌溉发展总体规划,介绍了高平市工程设施、工程效益、灌溉基础设施等灌溉现状,细致分析了高平市水源工程建设、灌排工程规划等灌溉发展情况.     

如何在工程竣工结算过程中控制工程造价

随着我国经济建设的发展,建筑企业的规模越来越大,工程结算又是决定工程造价最关键的一步,如何在这最关键的一步控制好工程造价.工程造价直接关系着建设单位和施工单位效益的问题,这就需要双方共同努力,所以文章就作者在这几年工作中总结的几点经验进行论述.     

Preliminary estimation of the organic carbon pool in China’s wetlands

Accurate estimation of wetland carbon pools is a prerequisite for wetland resource conservation and implementation of carbon sink enhancement plans.The inventory approach is a realistic method for estimating the organic carbon pool in China’s wetlands at the national scale.An updated data and inventory approach were used to estimate the amount of organic carbon stored in China’s wetlands.Primary results are as follows:(1) the organic carbon pool of China’s wetlands is between 5.39 and 7.25 Pg,accounting for 1.3%-3.5% of the global level;(2) the estimated values and percentages of the organic carbon contained in the soil,water and vegetation pools in China’s wetlands are 5.04-6.19 Pg and 85.4%-93.5%,0.22-0.56 Pg and 4.1%-7.7%,0.13-0.50 Pg and 2.4%-6.9%,respectively.The soil organic carbon pool of China’s wetlands is greater than our previous estimate of 3.67 Pg,but is lower than other previous estimates of 12.20 and 8-10 Pg.Based on the discussion and uncertainty analysis,some research areas worthy of future attention are presented.     

A method for distinguishing and linking turbulent entrainment mixing and collision-coalescence in stratocumulus clouds

This paper presents a method to distinguish and link inhomogeneous mixing with subsequent ascent and collision-coalescence. Three stratocumulus clouds analyzed were collected over the U.S. Department of Energy’s Atmospheric Radiation Measurement Southern Great Plains site during the March 2000 cloud Intensive Observation Period. The criteria are presented to distinguish the two processes. Inhomogeneous mixing with subsequent ascent is identified if cloud along an aircraft horizontal leg is non-drizzling and the relationship between cloud volume-mean radius and liquid water content is negative; in contrast, drizzling and positive relationship between the above two properties are the criteria for collision-coalescence. To link the two processes, threshold function, the possibility of occurrence of collision-coalescence, is employed; the big droplets generated during the inhomogeneous mixing with subsequent ascent increase the threshold function, initiates collision-coalescence and produces drizzle drops. To the authors’ knowledge, this is the first study on distinguishing and linking inhomogeneous mixing with subsequent ascent and collision-coalescence based on observational data.     

浅谈初步构建煤矿企业安全文化

构建煤矿企业安全文化对煤矿企业的安全生产具有积极意义,笔者对构建煤矿企业安全文化谈了自己的看法,并对今后煤矿企业安全文化建设进行了展望。     

认识素描——对于素描观念的再认识

素描所包含的不仅仅是一种技术.而是整个生命和意识对世界的一种看法和体验,并且可能是造型艺术的原动力和与之相伴的思维方式。解决素描问题应从它的认识入手。素描首先是一种艺术的语言状态。对素描的认识更多属于心理的范畴。对素描的认识论是先于一切方法的首要因素。