双孔平行梁式传感器设计的理论分析与实验研究

利用弹性力学有限元法对双孔平行梁式传感器的敏感元件进行应力应变分析，找出了应力应变的分布规律，在此基础上设计出一个量程为150N的传感器，并建造了一个小型实验台。提出了实验研究方案，研究了敏感元件工作点的应力和变形，实验验证了传感器输出与力的作用点无关的特性。理论分析与实验结果比较，得到的结论是有限元法的计算结果与实验吻合，材料力学的计算结果误差较大，双孔平行梁式传感器设计计算应采用弹性力学有限元法。     

Postbuckling of shear-deformable flat and curved panels under combined loading conditions

The static postbuckling of flat and doubly-curved shallow panels under the combined action of a system of uniaxial/biaxial compressive edge loads and a lateral pressure field is investigated, and the effects of transverse shear, initial geometric imperfections and tangential edge constraints upon load carrying capacity of curved panels are emphasized. Comparisons of the classical and shear deformable theories are made and issues related to the sensitivity to the snap-through behaviour are discussed. A variety of loading systems and panel geometries are considered in the numerical illustrations and pertinent conclusions related to the postbuckling response are outlined.     

扩展型制造物料清单视图构建及其演绎机制

为有效地满足生产中数据一致性、无冗余等需求,提出了一种新的扩展型制造物料清单视图,用以统一管理工艺部门和制造部门涉及的信息。在给出的物料清单视图定义的基础上,从结构、关联信息、属性三方面研究了扩展型制造物料清单视图的构建,并在关联信息类型划分的基础上将该视图划分为生产准备扩展型制造物料清单子视图和生产执行扩展型制造物料清单子视图,简要地阐述了两类视图的维护。从结构、关联信息、属性三方面研究了设计物料清单视图向生产准备扩展型制造物料清单子视图的演绎机制。最后,给出了在某工厂的应用实例。     

Procedural Synthesis using Vortex Particle Method for Fluid Simulation

We propose a fast and effective technique to improve sub‐grid visual details of the grid based fluid simulation. Our method procedurally synthesizes the flow fields coming from the incompressible Navier‐Stokes solver and the vorticity fields generated by vortex particle method for sub‐grid turbulence. We are able to efficiently animate smoke which is highly turbulent and swirling with small scale details. Since this technique does not solve the linear system in high‐resolution grids, it can perform fluid simulation more rapidly. We can easily estimate the influence of turbulent and swirling effect to the fluid flow.     

河北省风力发电的现状及前景

分析了河北风力发电发展的现状,指出了其中存在的问题和解决措施,并对河北风电发展的前景作出展望。     

PMS-500 可吸入颗粒物采样器的研制和性能测试

研制了用于环境中可吸入颗粒物(PM10)采样的 PMS-500 采样器.采样器运行流量为560 m3/h,采用变频技术控制流量稳定,用聚丙烯纤维滤材作为PM10的收集介质.设计了一种矩形喷嘴撞击器作为PM10切割器,撞击器的收集介质为容尘量较大的聚氨酯泡沫.对采样器的性能测试结果为切割器的切割粒径为9.9 μm,捕集效率曲线的几何标准偏差为1.4;采样期间流量波动在±2%之内;双层滤材对0.2 μm气溶胶的收集效率不小于99%.采样器可方便地拆分为三部分,机动性较好.本采样器与市售大流量PM10采样器的采样效率相当,其性能可以满足环保行业对PM10采样的要求.     

Constructing a Multivalued Representation for View Synthesis

A fundamental problem in computer vision and graphics is that of arbitrary view synthesis for static 3-D scenes, whereby a user-specified viewpoint of the given scene may be created directly from a representation. We propose a novel compact representation for this purpose called the multivalued representation (MVR). Starting with an image sequence captured by a moving camera undergoing either unknown planar translation or orbital motion, a MVR is derived for each preselected reference frame, and may then be used to synthesize arbitrary views of the scene. The representation itself is comprised of multiple depth and intensity levels in which the k-th level consists of points occluded by exactly k surfaces. To build a MVR with respect to a particular reference frame, dense depth maps are first computed for all the neighboring frames of the reference frame. The depth maps are then combined together into a single map, where points are organized by occlusions rather than by coherent affine motions. This grouping facilitates an automatic process to determine the number of levels and helps to reduce the artifacts caused by occlusions in the scene. An iterative multiframe algorithm is presented for dense depth estimation that both handles low-contrast regions and produces piecewise smooth depth maps. Reconstructed views as well as arbitrary flyarounds of real scenes are presented to demonstrate the effectiveness of the approach.     

2200m^3高炉水渣处理系统技术改造

安钢2200m3高炉水渣处理系统采用热INBA法,由于设计、施工缺陷,高炉投产后,水渣粒化效果很差,严重影响高炉正常生产.经过长时间的观察与研究,对该系统进行了技术改造,取得了较好的效果.     

一种无损恢复的多级别的可视密码方案*

针对传统可视密码方案存在像素扩展且只能恢复一幅秘密图像的问题,提出无像素扩展的多秘密可视密码方案。基于随机栅格理论和异或运算对多个级别的秘密图像进行分存,对各个级别的分存图像进行异或即可依次恢复所有级别的秘密图像。可以实现二值秘密图像的无损恢复,并可扩展到灰度图像和彩色图像。图像传输引入纠错编码机制,提高方案的可靠性。实验结果表明分存图像没有像素扩展,恢复图像与原秘密图像相比无失真且能满足安全性要求。