07MnNiCrMoVDR钢焊接力学性能分析

07MnNiCrMoVDR钢是一种调质型低合金高强度低温用钢。现已广泛应用于低温工作的容器、管道等结构中。本文通过对07MnNiCrMoVDR钢的可焊性进行分析,制定了钢板对接的焊接工艺,并在焊接过程中采取了质量控制措施,对厚度为38mm的钢板实施了对接。焊后对焊接接头进行力学性能试验,并得到了相应的力学性能参数和焊接是否满足使用要求的结论。     

Elastic Principal Graphs and Manifolds and their Practical Applications

Principal manifolds serve as useful tool for many practical applications. These manifolds are defined as lines or surfaces passing through “the middle” of data distribution. We propose an algorithm for fast construction of grid approximations of principal manifolds with given topology. It is based on analogy of principal manifold and elastic membrane. First advantage of this method is a form of the functional to be minimized which becomes quadratic at the step of the vertices position refinement. This makes the algorithm very effective, especially for parallel implementations. Another advantage is that the same algorithmic kernel is applied to construct principal manifolds of different dimensions and topologies. We demonstrate how flexibility of the approach allows numerous adaptive strategies like principal graph constructing, etc. The algorithm is implemented as a C++ package elmap and as a part of stand-alone data visualization tool VidaExpert, available on the web. We describe the approach and provide several examples of its application with speed performance characteristics.     

大型球罐再次组焊可行性分析

根据2010年世博会选址需要,有2台大型球罐需进行切割分拆,然后搬迁至新厂址进行再次组焊.为了保证此次球罐再次安装组焊的可靠性,对已经使用了10余a的球罐母材和焊接接头按照相关国家标准进行了严格的检测评定,并对球罐钢板母材和热影响区进行了冷裂纹、再热裂纹敏感性综合评估,为球罐切割和焊接组装的工艺制定提供了技术支持.     

Robust Spherical Parameterization of Triangular Meshes

Parameterization of 3D mesh data is important for many graphics and mesh processing applications, in particular for texture mapping, remeshing and morphing. Closed, manifold, genus-0 meshes are topologically equivalent to a sphere, hence this is the natural parameter domain for them. Parameterizing a 3D triangle mesh onto the 3D sphere means assigning a 3D position on the unit sphere to each of the mesh vertices, such that the spherical triangles induced by the mesh connectivity do not overlap. This is called a spherical triangulation. In this paper we formulate a set of necessary and sufficient conditions on the spherical angles of the spherical triangles for them to form a spherical triangulation. We formulate and solve an optimization procedure to produce spherical triangulations which reflect the geometric properties of a given 3D mesh in various ways.     

2007版公路工程新定额江苏地区造价水平测算

通过选用苏中地区一级路和二级路各一条分别按照92定额及07新定额进行预算的编制，对定额消耗量及造价结果等方面进行比较分析，测算出08新定额各分项的定额水平调整比例，从而为造价人员在采用新定额编制预算文件时积累经验。     

07LS06C采煤机记忆割煤的应用研究

阐述了JOY公司生产的07LS06C采煤机记忆割煤工作原理,介绍了该型号采煤机记忆割煤所需的准备工作,通过对07LS06C型采煤机记忆割煤在神东锦界煤矿31105综采工作面的应用情况,分析了该煤机记忆割煤的优点和不足,指出应在记忆割煤的基础上对煤机进一步改进。     

温度对低温钢07MnNiCrMoVDR接头拉伸性能的影响

通过低温拉伸试验和断口形貌观察分析温度对07MnNiCrMoVDR钢焊接接头的拉伸性能的影响。结果表明,随着试验温度的降低(0~-40℃),07MnNiCrMoVDR钢焊接接头的屈服强度和抗拉强度升高,延伸率和断面收缩率下降;宏观断口形貌和微观断口形貌分析都表明07MnNiCrMoVDR钢焊接接头的拉伸性能随着温度的降低而降低。     

储罐用07MnNiVR钢焊接接头力学性能试验

为了将07MnNiVR钢板用于建造大型储罐,根据确定的焊接工艺和焊接工艺参数,研究了焊接接头的拉伸性能、系列冲击性能、无塑性转变温度和断裂韧度等,各项力学性能表明,焊接接头可满足大型储罐的设计要求并且保证其安全运行。     

压力容器用07MnNiMoDR钢板的低温冲击韧性研究

利用金相显微镜和扫描电镜分析了07MnNiMoDR钢板的基体组织和冲击断口形貌,研究了影响钢板板厚1/2位置冲击韧性的根本原因。板厚1/2位置的变形不足导致心部组织粗大,同时有大颗粒碳化物伴生于粗晶粒的晶界,碳化物的存在是影响冲击韧性的根本原因。通过优化轧制和热处理工艺,钢板冲击功值稳定在240 J以上。