旋压技术在皮带轮中的应用

旋压是一门新的塑性加工技术,主要用于生产薄壁回转体零件。这里介绍了几种皮带轮的旋压加工工艺过程。实践证明,经旋压加工的皮带轮无论在精度、强度,还是传动、轻巧度方面,都比其他生产方式产品要好。     

ICF实验中散射光角分布测量的数据分析系统

简要阐述了一个用旋转椭球镜和照相底片一次曝光获得激光惯性约束聚变实验中的散射光角分布信息的实验方法,介绍了其实验数据的分析处理方法并给出误差分析。     

Tracing the emerging energy transitions in the Global North and the Global South

During recent centuries, in the Global North, every energy crisis has been overcome, sooner or later, with a transition that has led to an increase in the average per capita energy consumption. Currently, due to the environmental and social impacts of the dominant high-consumption and fossil-fuels based energy model, we are seeing some initiatives that pursue a transition towards a democratic, low-carbon and low-energy consumption level energy system. This work analyses some of the socio-cultural, technological, economic and political factors that are leading to different multi-scale transitions towards low-energy societies around the world. It examines several different cases of transition and proposals from the Global South and Global North. Furthermore, given the limitations of the local or partial nature of these case studies, we also analyse their national energy contexts taking into account the hidden energy flows. These data integrate the total energy needed to provide the goods and services consumed by citizens and indicate the sectors that should be targeted to bring about genuine change, which sometimes differ from the transition paths signposted by national governments. The specific lessons extracted from the case studies in this research may contribute to a social learning process, promoting democratic and sustainable energy models in different regions of the world: peak oil could be an opportunity; energy needs to be equitable, not only renewable; there should be more sincerity and transparency in public energy data communication; energy should be controlled in a public or cooperative way; citizens should take control of their own investments in the energy sector; energy should be a right, not a commodity; community based consumption could reduce energy consumption; and sustainable urban development should be applied in cities and towns, where energy consumers could also become producers.     

新型翻转展示架设计研究

设计制作一种用以衣物展示和存放的翻转展示架,实现衣物的立体翻转效果。该装置利用重力、弹簧的弹性变形储能等形式,设置滑轮连接滑架在导轨上运动,并在两条滑架交叉的＂X＂处实现滑架的水平旋转,从而实现悬挂衣物等物品的翻转,方便使用者观看。装置形式新颖,材料易得,具有广阔的市场前景。     

离心铸造工艺制备WC颗粒增强钢基回转体零件研究

通过改进现有悬臂式离心铸造机,成功制备了外径200 mm、内径140 mm、长150 mm的碳化钨颗粒增强钢基回转体复合材料.分析了增强颗粒在离心铸造中的受力情况,推出液态金属中的颗粒在离心力场下的运动规律.采用光学显微镜、扫描电镜和X射线衍射,分析了复合层中碳化鸽颗粒的分布规律,以及复合层的物相组成.结果表明,碳化钨颗粒体积分数在复合层中由内向外逐渐增加,其表层碳化钨颗粒复合层厚度约5 mm,颗粒与基材结合良好,没有夹杂、裂纹等缺陷;颗粒与颗粒之间无缠结团聚现象;颗粒周围部分溶解,复合层中存在Fe,W3 C相,颗粒与基材间形成冶金结合.     

旋转螺旋溜槽在矿山的工业应用

旋转螺旋溜槽是我国研制后种综合了螺旋溜槽、摇床、离心选矿机３种设备特点的新型高铲选矿设备。本文主要阐述旋转溜槽在几个矿山工业中的应用的效果。     

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薄壁旋转壳是一类在油气储运设备中广泛出现的结构，如储罐及其弹性罐顶，柔性波纹管和薄壁管道等，针对这类结构往簇具有承受复杂的非国对称载荷的特点，文章基于Sanders非线性薄壳理论，对油气储运设备中的一类旋转壳结构的非轴对称几何非线性特性进行了分析，利用旋转壳的几何轴对称性，用截锥单元对其进行了有限元离散，而后将所有物理量，包括非线性耦合项，均沿环向展开成Fourier级数的形式，并借鉴Ball的思想，引入：伪载荷”的概念，通过适当的三角恒等式将 非线性耦合项处理成“伪载荷”，由此建立起一种形式简单，易于实施的迭代格式，文末的两个算例模拟了储罐及其顶盖在风载和地震载荷作用下的力学特性。     

计算机控制卷绕式镀膜机悬臂调整机构

介绍了卷绕式镀膜机工作时悬臂位置调整的两种方法。着重分析了用计算机自动控制悬臂位置调整的方法及步骤。     

非等温旋转曲面温度场的在线监测

精密加工过程中旋转曲面温度在线监测的方法有:红外测温仪测温、CCD热像仪测温、红外传送信号的接触测量、温敏电容及涡流损耗测温.采用斯忒鄱-玻尔兹曼定律的红外测温选用红外传感头实现.基于红外CCD的红外焦平面热像仪以电子扫描代替光机扫描.红外传送信号的接触测量通过红外通讯传递热电偶的温度信号.利用温敏电容对温度敏感的特性,由电容变化可测量旋转曲面附近的温度.利用金属材料在交变磁场中因磁滞效应和涡流效应会引起的功率损耗,能测量出其所处温度场的温度.同时比较了这些方法的利弊,分析了它们的精度影响因素.     

平衡二叉树

介绍平衡树插入新结点失去平衡后,进行旋转调整使之成为新的平衡二叉树的四种情况.