影响加工中心加工精度的因素

加工中心是高效自动化设备，为了充分利用机床的高效率、高精度、高自动化等特点，所以要考虑和了解影响加工中心加工精度的因素。     

稀释磁性半导体Sn1-xMnxO2的室温铁磁性

采用固相反应法，制备了不同成分的稀释磁性半导体Sn_1-xMn_xO ₂(x=002，004，006)．利用x射线衍射和傅里叶变换红外光谱法证明 了锰均匀地掺杂到二氧化锡中．在室温下研究了掺锰二氧化锡基稀释半导体的磁性，发现它具有明显的铁磁性 ，同时对磁性的强弱与锰的含量和烧结温度的关系作了研究． 关键词： 稀释磁性半导体 掺杂 烧结 铁磁性 1-xMn_x O₂')" href="#">Sn_1-xMn_x O₂     

The Experiment and Design of Confocal Laser Scanner for Biochip

In this article ,we chiefly discuss optical part and photoelectrical part, and analyze the result data to make out the relationship between pinhole and special resolution and the influence of PMT on the result data.     

An Iterative Procedure for Evaluating Digraph Competitions

A competition which is based on the results of (partial) pairwise comparisons can be modelled by means of a directed graph. Given initial weights on the nodes in such digraph competitions, we view the measurement of the importance (i.e., the cardinal ranking) of the nodes as an allocation problem where we redistribute the initial weights on the basis of insights from cooperative game theory. After describing the resulting procedure of redistributing the initial weights, an iterative process is described that repeats this procedure: at each step the allocation obtained in the previous step determines the new input weights. Existence and uniqueness of the limit is established for arbitrary digraphs. Applications to the evaluation of, e.g., sport competitions and paired comparison experiments are discussed.     

A Variational Approach to Multiple Layers¶of the Bistable Equation in Long Tubes

Multiple-layer solutions of the balanced bistable equation in infinite tubes are constructed via a variational method. I start with a characterization of Palais-Smale sequences which easily gives some global minima in the desired function classes as single layers. Assuming these minima are isolated as critical points, I paste them together to serve as an approximate multiple-layer solution. If there were no exact solutions near the approximate one, the negative gradient flow of the energy functional would significantly lower the energy. On the other hand, if the minima are kept far from each other, the energy of a function near the approximate solution is not much less than that of the approximate solution. This contradiction proves the existence of a solution. (Accepted January 11, 1996)     

A well-posed shooting method for transferable DAE's

Summary Consider a TPBVP for transferable nonlinear DAE's. In general the shooting equation has a singular Jacobian. A multiple shooting method which has a nonsingular Jacobian and also produces consistent initial values for the integration is presented. The estimation of the condition of the Jacobian shows the well-posedness of the method. Some illustrative examples are given     

Structure and Catalytic Behaviour of Saponite and Its Cross-Linking Product

Synthetic saponites have been intercalated with hydroxyl aluminium oligomers and characterized with several techniques. The basal 001 peak of the pillared saponite (PS) is 1. 8 nm. The amount of the aluminium in the tctrahedral sheet is correlative with cross-linking density. The sheet-to-pillar linkage mode may be Si-O-AlpⅥ. The acid sites in pillared saponite may locate either at surface of clay or at that of pillar. The cumene conversion is relative to accessible acid sites on the surface of PS. The pillar density in the PS has an effect on the pore structure which is correlative with shape selectivity during the reaction between ethanol and ammonia.     

ON THE EMPTY CONVEX PARTITION OF A FINITE SET IN THE PLANE

The authors discuss the partition of a finite set of points in the plane into empty convex polygons, and improve some upper bound and lower bound in the related enumeration problems.     

基态和激发态氧振动光谱的量子力学计算

利用分子势能函数的Murrell-Sorbie和PG函数形式,将时域有限差分法应用基态和激发态氧分子的振动能级的量子力学计算,计算结果令人满意.