JDZ48C-A真空贴标机标签盒前后运动的运动规律设计

运动规律的设计，直接影响凸轮机构的运行精度。通过对凸轮机构运动规律的优选设计，提高机构的工作可靠性和工作精度。     

网络环境下应建立高校图书馆服务标准评价体系

建立高校图书馆服务标准评价体系，把服务的重心放在对知识的整合和信息资源新模式建设上，服务标准评价体系随着馆藏质量与检索质量评价标准等量变化而变化，并在馆藏资源和网上资源间找到最佳结合点，体现高校图书馆服务标准发展的主体方向。     

Short communication Approximate merging of multiple Bézier segments

This paper deals with the approximate merging problem of multiple adjacent Bezier curves with different degrees by a single Bezier curve, which is a frequently seen problem in modeling. The unified matrix representation for precise merging is presented and the approximate merging curve is further derived based on matrix operation. Continuity at the endpoints of curves is also discussed in the merging process. Examples show that the method in this paper achieves satisfying merging results.     

注塑件局部形状与充模时间和充满时温度场的关系

运用比例，分析了１／８球面用于过渡时与周边几何约束之间的关系，并在此基础上提出了过渡曲面设计的新方法．上述设计注塑过程的工程分析表明：反映局部形状的过渡曲面与充模时间、充满型腔时刻温度场之间存在显著的联系，优美的外部造型对应着较短的充模时间和较均匀的温度场．这意味着对注塑件，优美外部造型与精良内在品质之间存在一种潜在的和谐．     

Isomorphisms of fiber spaces over Teichmüller spaces

We will be mainly concerned with some important fiber spaces over Teichmüller spaces, including the Bers fiber space and Teichmüller curve, establishing an isomorphism theorem between “punctured” Teichmüller curves and determining the biholomorphic isomorphisms of these fiber spaces.     

构造一类偏微分方程组通解的机械化方法及力学方程的自动推理

用微分代数的观点，把标准型算法和矩阵多元多项式的带余除法相结合，获得构造一类微分方程组的通解的新方法，并在标准型算法的基础上给出了力学方程的推理的机械化方法。     

Self-optimizing Diffusion Quantum Monte Carlo Calculation: the Potential Energy Curve of C_2

11NTRODUCTIONDiffusionquantumMonteCarlo(DMC)isoneofthesimplestofthevariousMonteCarlotechniquesavailabletosolvetheSchrodingerequation,forarecentre-viewofDMC(seeRef[1i).Foravarietyofsmallatomsandmolecules,DMChasbeenshowntobecapableofprovidinganestimateoftheground-state(nonrelativistic)energywithanaccuracycomparabletogoodqualityClcalculations,evenwhenarelativelysimpletrialwavefunctionisemployed.However,todate,thereareseveralobstaclesinaDMCcalculation:(1)BeforetheDMCcomputation,thepar…     

几种脊椎动物红细胞血型的比较研究

采用两种方法对脊椎动物各纲的代表动物小白鼠、家兔、家鸽、蟾蜍、鲫鱼的红细胞血型进行了研究 .方法一 :采用人类抗A、抗B标准血清与上述动物的红细胞进行反应 ,结果均未出现凝集现象 ,表明 :这几种动物的红细胞膜上 ,没有与人类抗A、抗B标准血清起反应的A凝集原和B凝集原 .方法二 :采用同种动物的血清与同种动物不同个体的红细胞进行反应 ,结果 :上述几种动物的红细胞与同种内不同个体的血清均不发生凝集反应 .     

The bias of k-step M-estimators

It is well-known that k-step M-estimators can yield a high efficiency without losing the breakdown point of the initial estimator. In this note we derive their bias curves. In the location framework the bias increases only slightly with k, but in the scale case the bias curves change considerably.     

不变性在线性代数中应用两例

本文介绍数学中“不变性”思想，讨论了线性代数中某种条件下秩数不变、特征多项式、特征值不变；对称性、半正定、正定性不变；以及度量性不变．以初等变换为首要方法，解决线性代数中一类重要问题．阐述了矩阵或线性方程组线性变换的本质