Error estimation in the approximation of the solution of nonlinear fuzzy Fredholm integral equations

Using a fixed point technique, the sequence of successive approximations and a recent quadrature formula for fuzzy-number-valued functions, it is constructed a numerical method for the solution of nonlinear fuzzy Fredholm integral equations. Moreover, the error estimate of the method and a criterion to stop the corresponding algorithm are given.     

ZG30Cr06A热物性参数的测定及在铸造CAE中的应用

应用射线吸收、激光脉冲等方法测定了新型合金ZG30Cr06A的热物性参数,并应用MAGMAsofl和ABAQUS等X2AE软件对该材质柱窝零件铸造工艺进行了优化设计以及应力分布分析.CAE模拟分析结果与生产实际吻合.     

A Study of Saccharomyces cerevisiae Cell Wall Glucans

Much research has been carried out over the years examining cell wall glucans from Saccharomyces cerevisiae and this study further examines aspects of the binding of (1r?4)‐α‐D‐glucan in the yeast cell wall, using a number of isolation techniques as well as monoclonal antibodies able to recognize a mixed (1r?4)‐α‐D‐glucan/(1r?6)‐β‐D‐glucan. Extraction of purified glucan, from S. cerevisiae cell wall, with 0.1N HCl, at 80°C for 6 h, released into the solution (1r?4)‐α‐D‐glucan and (1r?6)‐β‐D‐glucan as the major polysaccharides, along with an insoluble pellet highly enriched in (1r?3)‐β‐D‐glucan. The released (1r?4)‐α‐D‐glucan was composed of a high molecular size >100 kDa fraction (7.2% w/w) and a medium 5–50 kDa polysaccharide (10.2% w/w), with the (1r?4)‐α‐D‐glucan covalently bound to the (1r?6)‐β‐D‐glucan. The average molar ratio of the α:β glucan was 47: 53 in this mixed polysaccharide. The structure of this polysaccharide was different from the structure of plant starch or animal glycogen as monoclonal antibodies specific to yeast (1r?4)‐α‐D‐glucan/(1r?6)‐β‐D‐glucan did not recognize the plant starch or animal glycogen standards.     

粮库用30点温度巡测仪的研制

介绍一种体积小，成本低，操作简便，经济实用的粮库用30点温度巡测仪，并详细地阐述了该仪器的工作原理及制作，校正等操作性较强的经验和方法。     

Weighted Error Estimates for Finite Element Solutions of Variational Inequalities

In this note the studies begun in Blum and Suttmeier (1999) on adaptive finite element discretisations for nonlinear problems described by variational inequalities are continued. Similar to the concept proposed, e.g., in Becker and Rannacher (1996) for variational equalities, weighted a posteriori estimates for controlling arbitrary functionals of the discretisation error are constructed by using a duality argument. Numerical results for the obstacle problem demonstrate the derived error bounds to be reliable and, used for an adaptive grid refinement strategy, to produce economical meshes. Received September 6, 1999; revised February 8, 2000     

Robust Multigrid Methods for Nearly Incompressible Elasticity

We consider multigrid methods for problems in linear elasticity which are robust with respect to the Poisson ratio. Therefore, we consider mixed approximations involving the displacement vector and the pressure, where the pressure is approximated by discontinuous functions. Then, the pressure can be eliminated by static condensation. The method is based on a saddle point smoother which was introduced for the Stokes problem and which is transferred to the elasticity system. The performance and the robustness of the multigrid method are demonstrated on several examples with different discretizations in 2D and 3D. Furthermore, we compare the multigrid method for the saddle point formulation and for the condensed positive definite system. Received February 5, 1999; revised October 5, 1999     

应用MDS图的逻辑电路级设计--篮球30秒定时计时器的设计

介绍了用方法直观方便、规范和有章可循的MDS图方法设计小型数字系统“篮球30秒定时计时器”的具体过程。     

甲基四氢苯酐对促进剂DMP—30变色原因及其合成工艺改进的研究

以红外光谱这一表征手段探析了促进剂ＤＭＰ—３０使环氧树脂固化剂甲基四氢苯酐［ＭｅＴＨＰＡ（ＨＫ０２１）］变色的原因，通过合成工艺改进，制得了性能较为优良的ＭｅＴＨＰＡ（ＨＫ０２３８）。     

Monopolistic competition, increasing returns, agglomeration, and transport costs

This paper presents a model where production concentrated in one place is compared with dispersed production. Concentrated production can attain a higher level of productivity but must incur transport costs. Dispersed production, on the other hand, has a lower productivity level but need no transportation. In order to avoid unnecessary complications, output per capita is used as an objective function. Transport cost is measured in units of output and will therefore affect the objective function directly. The model uses a linkage approach where a final output is produced under constant returns to scale. This production has increasing returns to the number of differentiated inputs. The differentiated intermediate inputs are produced subject to increasing returns to scale in a framework of Chamberlinian monopolistic competition. The size of the market determines the number of intermediate inputs that the local economy can accommodate. In this way the model formalises Adam Smith's theorem on the division of labour being limited by the extent of the market. The paper examines how the break-even point between the two ways of organising production is affected by (i) changes in transport cost and market density and (ii) shifts in technology for producers of intermediaries and the final output. Received: December 1999/Accepted: January 2001