中西方古典园林的差异、原因及本质探析

园林是人类理想中的天堂,不同的自然环境和自然观孕育了不同的园林理想和现实的园林形式.中国古典园林追求天人合一,强调自然与精神的和谐,西方古典园林则追求秩序与几何美,强调对自然的控制与征服.本文阐述了中西方古典园林的表征差异,分析了造成差异的主要原因,指出其本质原因在于自然环境的不同.     

用警示教育确保廉政

4月6日,省水利厅在省防汛抗旱保障中心四楼会议室召开了厅机关和附属单位党员干部廉政警示教育会议,会议由厅党乡组成员、纪检组长徐春太主持。会议首先传达了中纪委《坚决查处严重违反制度的行为,     

Novel technology on preparation of double-layered pellets for sulfur and arsenic-bearing gold concentrates

Double-layered pellet （DLP） roasting is a novel pretreatment method for sulfur and arsenic-bearing gold concentrates. In this process, preparation of DLPs is a fundamental step which is required to produce DLPs with favorable mechanical strength and thermal stability. Studies were carried out to investigate the affecting factors and conditions on the preparation and properties of DLPs. The results show that moisture content has significant influence on DLPs preparation. With the increase of moisture content in the range of no more than 9.8%, drop resistance and compressive strength of green DLPs are raised and the pelletizing dynamics is improved accordingly. The optimum conditions are determined as moisture content of 9.8%, coating time of 14-16 min, drying temperature 〈80 ℃and drying gas velocity 〈1.2 m/s. When DLPs prepared under these conditions are roasted at 600 ℃ for 1 h, favorable removal and solidifying rates can be obtained, in which the removal rates of arsenic and sulfur are 94.38% and 82.55%, and the solidifying rates of arsenic and sulfur reach 99.62% and 99.79%, respectively. These results promise industrial application of DLP roasting.     

Effect of dolomite on reduction swelling property of iron ore pellets

The effect of various dosages of dolomites on the reduction swelling property of iron ore pellets was studied. Experimental results show that the reduction swelling index(RSI) decreases from 13.35% to 4.0%, while the porosity of roasted pellets increases from 35% to 40% with increasing the dolomite dosage from 0 to 10.5%. Meanwhile, the content of magnesium ferrite with high melting temperature, as well as the stability of magnetite(Fe3 O4) in the roasted pellets, increases with increasing the magnesium oxide(MgO) content from dolomite. The reasons for the decrease of RSI rely on the absence of crystal transformation from Fe2 O3 to Fe3 O4, the increased porosity of roasted pellet, and the suppression of phase transition of 2CaO·SiO2 resulted from the incorporation of magnesium into calcium silicate.     

SCM435钢的相变模型

利用热模拟仪对SCM435钢进行了连续冷却转变曲线(CCT曲线)的测定,并用显微镜观察及统计其室温组织.利用Or-igin软件对实验数据进行处理,根据SCM435不同冷速下的相变及相变转变量,进行铁素体、珠光体、贝氏体、马氏体相变模型的回归.并精确地建立了相变点温度-冷却速率关系模型及相变量-冷却速率关系模型,回归计算得到该钢种的最优模型系数.最后对比了SCM435钢的实验值和回归曲线,结果表明计算值与实验值吻合较好,证明所建立模型的合理性及数据处理方法的可行性,因此可以根据回归结果对实际生产中的真实冷却速率做出实时反应,便于对生产进行更加准确地控制.     

发动机气道CFD分析流程自动化研究

在成熟的发动机气道CFD分析流程的基础上,基于CFD分析软件Star-ccm+和Java编程语言,提出并探索了发动机气道CFD分析流程自动化的解决方案,并开发出了简单的气道CFD自动化分析平台,可在一定程度上提高气道CFD分析的效率.该方案对其他CFD分析问题的流程自动化也具有借鉴意义.     

附加湍流器强化陶瓷膜微滤过程的研究

通过在管式陶瓷膜内设置不同结构形式的湍流器，试验和比较了不同主体流速和膜滤压差等工艺条件下的膜滤速率及能耗，分析了湍流器所产生的强化膜滤过程的效果以及试验条件下的一般规律。     

行星齿轮减速器总成失效分析

某运载车辆在行驶了约6000km后一套行星齿轮减速器总成失效.根据齿轮的硬度、化学成分、金相组织以及断口分析结果,综合行星齿轮减速器的工作原理,最终确定外齿圈为肇事件.行星齿轮减速器外齿圈淬火区不完整导致齿面局部硬度偏低,致使外齿圈齿面发生疲劳磨损是导致此次故障的根本原因,行星齿轮心部硬度偏高也促进了轮齿的断裂.     

虚拟制造环境下VE型分配泵的研发

介绍了虚拟制造技术及其分类，探讨了以设计为中心的虚拟制造技术在汽车零部件研发中的实践．利用该技术，以柴油发动机VE型分配泵为研究对象，重点分析了传动部件易断裂问题，研究内容涉及产品全生命周期的各个阶段，包括虚拟样机设计、虚拟样机运动学动力学仿真、虚拟装配、有限元分析和零件虚拟加工仿真等，并对研究结果进行了实验验证．结合企业实际，给出了解决方案．