EFFECT OF AERATOR ON HYDRAULIC DRAG ACTING ON A CHUTE

The formulae used to calculate the friction in the non-uniform flow chute were examined with the experimental data. and the results show that the accuracy of the formula is enough for engineering applications. A comparison between the results of friction respectively from the uniform flow assumption and the non-uniform flow approximation indicates that the former is an order of magnitude larger than the latter in the case of steep chute. The hydr~3ulic drag on a steep chute with aerators was measured on the hydraulic model directly and the coefficient of the aerator effect on the drag was obtained. The variation patterns of the wall shear just down stream of the aerators were investigated and the mechanism of the increase in the drag by aerator were analyzed qualitatively with the measured water depths just downstream the aerators.     

浅谈谨慎性原则在会计核算中的运用

谨慎性原则是企业会计核算中一项重要原则,运用十分广泛。在企业经营活动中存在大量不确定性因素的情况下,谨慎性原则既有其合理的一面,同时也存在其固有的局限性。合理应用谨慎性原则,有利于企业作出正确的经营决策,有利于保护所有者的利益,有利于提升企业的市场竞争力。在实际运用中存在谨慎性原则应用不当的现象,应采取必要措施趋利避害,使会计信息更具客观性。     

译者个性审美差异与翻译风格研究

不同的审美经历和个性成就了不同的译者,译者自身的个性气质形成了译者的翻译风格,特别对其选材产生深远的影响。研究译者翻译风格就必须了解译者风格与其自身个性气质的关系,并深刻认识到个性审美差异对译者翻译风格的形成起着至关重要的作用。     

Indicators for assessing changing landscape character of cultural landscapes in Flanders (Belgium)

The increasing pace and scale of landscape change initiated a renewed interest in cultural and heritage values of the landscape. Efforts are made in inventorying, monitoring, and evaluating landscapes, needed for developing management and conservation plans, and also new concepts emerged. Landscape character became a new paradigm, as well as time depth and landscape change trajectory or path. Also, the use of landscape indicators for describing character and assessing changes has been widely tested. In Flanders, the rich landscape diversity is degrading rapidly due to extreme urban pressure and severe fragmentation by transport infrastructures. In this study a series of spatial data layers was used to describe and map the transformation of landscape character. Historical topographical maps and orthophotomaps from different periods were used to define landscape character types, which were mapped as polygons in a GIS. Map overlaying allowed analyzing the time depth and landscape constancy. The landscape character types were used as patches for the spatial and structural analysis and defining indicators of character change. A selection of class and landscape-based landscape metrics were used as such indicators, as well as the openness of the landscape. This selection was based upon the presumed relationship between the indicator and perceivable (visual) properties relating to landscape character. The landscape indicators express change very differently and several indicators are necessary to assess changes in the landscape character.     

论汉字形义联想识字教学法

该文从分析当前汉字识字教学现状入手,指出了不能准确说明常用字的主要义项、易锚字屡校屡错、别字屡见不鲜的原因,阐述了利用汉字形、音、义的联系和规律进行形义联想识字教学的具体意义和可行性,提出了实验建议。     

论商业秘密的法律性质

商业秘密可分为组织机构信息、财务信息、人事信息、经营信息、技术信息。在法律属性上,它是一个特殊的知识产权。其权利人享有对商业秘密的实际专有权,商业秘密的构成要件是:秘密性、保密性、价值性、实践性。     

天津滨海新区综合配套改革的时代特征和总体设想

天津滨海新区综合配套改革的根本任务,是充分发挥市场配置资源的作用,着力在转变政府职能和构建和谐社会两个方面努力,探索建立贯彻科学发展观的体制和机制,主要是以经济体制改革为重点,对社会、政府等各项体制进行综合配套改革。本文分析了天津滨海新区综合配套改革的时代特征和总体设想。     

液压动态仿真技术在抽水蓄能电站的应用探索

液压系统是抽水蓄能电站的一种重要动力设备,为了充分掌握其工作原理及工作过程,通过对深圳抽水蓄能电站尾水闸门液压系统进行动态仿真研究,从图形化建模实现系统仿真,模拟液压系统动态过程,实现故障分析和预控等应用需求;液压动态仿真系统也是学习和掌握液压设备的一套实用化辅助工具.     

长距离输水管道水力计算公式的选用

就长距离输水管道的材质、管道口径和衬里等管道特性因素,结合各设计规范的推荐公式进行了对比分析,并根据各水力计算公式的适用范围及限制条件,指出不同管道特性条件可能对水力计算结果造成的影响,建议在大口径长距离输水管道设计中采用对三个紊流区域均适用的柯列勃洛克公式替代海澄威廉公式,以期得到较为安全合理的设计成果。     

基于Weibull模型的混凝土冻融损伤寿命预测及应用

对北方严寒和寒冷地区水工混凝土结构而言,其抗冻性能是混凝土耐久性最具代表性的指标,也是影响工程实体服役寿命的关键因素。为了能够准确预测既有混凝土构筑物的使用寿命,本文以冻融损伤理论为基础,采用棱柱体试件进行了混凝土快速冻融物理模型试验,建立了基于Weibull模型和混凝土快速冻融试验的混凝土冻融损伤模型。基于该模型提出一种迭代逼近的混凝土寿命预测方法,通过室内试验和实际工程案例进行验证。结果表明：通过所建立损伤模型得到的冻融损伤预测值和试验实测值基本吻合,提出的寿命预测方法得到的预测数据较为可靠。