利用分形插值函数构造多小波尺度函数的一个新方法

S.Geronimo等利用分形插值函数构造出了L^2(R)上的平移和伸缩不变函数空间，但未给出构造多小波尺度函数和尺度系数矩阵的具体算法，本文给出利用分形插值函数计算尺度系数矩阵的新算法，并对尺度函数作二尺度相似变换，使其具有更高的逼近阶。     

三角Bezier曲线插值及其误差分析

Bezier曲线是计算机辅助几何设计中的一类重要曲线，以三次三角Bezier曲线为例，对三角Bezier曲线的性质进行了分析，并由此推出三次三角Bezier曲线比三次Bezier曲线更光滑。然后，由连续函数f在给定区间[a，b]上的分割△：a=t0〈t1〈…〈tn-1〈tn=b和函数值f（ti），导出了三次三角Bezier曲线插值算法，并对插值的整体误差和节点区间[ti，ti＋1]内的误差进行了分析估计；最后给出的应用实例验证了上述结论。     

二元正态分布函数(Coons曲面法)插值研究

根据Coons曲面生成原理，给出了二元正态(Gauss)分布的插值方法。对于二元正态分布密度函数，仅需给定插值区域边界上的值，即可插值出该区域上任意一点密度函数值；对于二元正态分布函数，仅需给定插值区域两边的双边界值，即可得到该区域上任意一点分布函数值。该方法无需知道也无需计算出Gauss分布函数的各项参数，便于应用，插值结果精确，绝对误差为O(10＾－9)，相对误差为O（10＾－11）。     

一种新的二元有理插值及其性质

构造了一种带参数的仅基于函数值的分子为双四次、分母为双二次的二元有理插值样条函数,插值函数具有简洁的显式表示。插值函数中含有4个参数,当这些参数满足一定条件时,插值曲面在插值区域上C1光滑。由于插值函数中含有参数,这样可以在插值数据不变的情况下通过对参数的选择进行插值曲面的局部修改。最后讨论了插值函数的一些性质。     

椭圆特征值问题的局部径向基函数差分法（英）

本文介绍椭圆特征值问题的局部径向基函数差分法．这种方法的主要思想是人为选取各插值节点所对应的影响区域，只考虑影响区域内插值点对该插值节点的影响，忽略影响区域外插值点的影响．这种局部化方法在损失一定计算精度的同时离散得到稀疏矩阵，从而使算法能应用于计算大规模插值节点科学计算．通过数值实验，研究了节点分部，插值点数以及形状参数对该特征值问题计算结果的影响，并选用三种径向基函数进行计算比较．数值结果和解析解非常吻合．     

基于LabVIEW的方向盘力角仪校准系统的设计

利用LabVIEW软件设计了一套方向盘力角仪校准系统，对转向力和转向角传感器的信号采集并数据处理、保存和打印，极大的提高了现有方向盘力角仪校准系统的自动化程度。针对以往方向盘力角仪的校准点是离散的，机动车检测站无法获取连续修正值的情况，引入了牛顿插值函数和三次样条插值函数对方向盘力角仪的校准结果进行插值计算，并绘制校准结果修正值曲线图，从而为客户提供了连续可靠的参考修正值。最后以转向力参数为例，对校准系统测试，结果表明该校准系统的测量结果准确可靠，满足量值溯源的要求，三次样条插值函数曲线的应用为客户提供了有效的参考修正值。     

一种有理插值曲线的保凸控制问题

在给定的插值数据条件下,利用一种带参数的有理插值方法,通过调整插值函数中的参数,给出了插值曲线的保凸方法和该方法得以实现的充分必要条件。这种条件是对参数的简单的线性的不等式约束,容易在计算机辅助几何设计中得到实际应用;而在理论上,它将一般插值理论上的“插值函数关于插值条件的唯一性”演化为“插值函数关于插值条件和参数的唯一性”。给出的数值例子说明了这种方法的有效性。     

采用不同插值函数的流体力学有限元数值波动研究

对一维定常对流扩散方程有限元解的波动问题进行汇总和分析,讨论产生有限元解波动的原因,介绍常用的处理解波动的基本原理和技术。采用不同插值函数进行有限元分析,并与解析解对比,重点讨论了指数型插值函数有限元解的波动和收敛性。研究结果表明提高插值函数连续性可以改善一维对流扩散方程有限元数值波动情况。与线性Lagrange插值函数相比,指数型插值函数可精确给出变量在单元内的分布,并能较好地控制数值波动现象。同时在较稀疏的网格条件下,指数型插值函数可取得问题较好的数值解。     

M-带正交插值小波的构造

考虑由M-带正交插值函数构造相应小波函数的矩阵扩充问题。利用插值特性,给出插值函数相应正交小波符号函数的显式构造公式。最后以算例说明该算法。     

舰船稳性计算中附体影响的一种处理方法

提出在静水力曲线、邦戎曲线以及船形稳度力臂插值曲线计算中对附体处理的一种新方法，即建立在三次样条插值函数积分基础上的附体体积分布法．该方法将附体按体积与体积中心等效的条件分布到船体型值点上，其中船体体积与体积中心采用三次样条插值函数积分法进行计算，以此来修正其对船舶静力计算结果的影响．按该方法对某船带附体的静水力曲线、船形稳度力臂插值曲线进行了计算，并对计算结果进行了分析，表明该方法在工程应用中可获得满意效果．     

Insertion of triangulated surfaces into a meccano tetrahedral discretization by means of mesh refinement and optimization procedures

In this paper, we present a new method for inserting several triangulated surfaces into an existing tetrahedral mesh generated by the meccano method. The result is a conformal mesh where each inserted surface is approximated by a set of faces of the final tetrahedral mesh. First, the tetrahedral mesh is refined around the inserted surfaces to capture their geometric features. Second, each immersed surface is approximated by a set of faces from the tetrahedral mesh. Third, following a novel approach, the nodes of the approximated surfaces are mapped to the corresponding immersed surface. Fourth, we untangle and smooth the mesh by optimizing a regularized shape distortion measure for tetrahedral elements in which we move all the nodes of the mesh, restricting the movement of the edge and surface nodes along the corresponding entity they belong to. The refining process allows approximating the immersed surface for any initial meccano tetrahedral mesh. Moreover, the proposed projection method avoids computational expensive geometric projections. Finally, the applied simultaneous untangling and smoothing process delivers a high‐quality mesh and ensures that the immersed surfaces are interpolated. Several examples are presented to assess the properties of the proposed method.     

The Research of Anti-Wear Properties of Organomolybdenum Compounds in the Engine Oils

A four-ball tester was used to evaluate the anti-wear performance of three kinds of organomolybdemun compounds in the engine oils, i. e., molybdenum dialkyldithiophosphate (MoDDP), molybdenum dialkyldithiocarbamate ( MoDTC), and sulphur and phosphorus freeorganomolybdeum (Molybdate). The results indicate that a low concentration of MoDDP doesn' t improve the anti-wear properties of the commercial engine oils, but a high concentration of MoDDP can obviously improve the anti-wear properties and the load-carrying capacity of the engine oils. MoDTC doesn' t improve the antiwear properties of the engine oils, but worsens the anti-wear properties of the oils. Signifi can timprove ment of frictional and wear characteristics is obtained with Molybdate added in the commercial engine oils and the formulated oils.     

Certification Institutions Expected to Update and Transfer Information on Present Standards

Standards are the basis for production enterprises to organize production, ex-factory inspection, trade (delivery) and technical exchanges, product certification, quality arbitration and supervision.……     

Flow calorimeter for enthalpy increment measurements on condensed gases

A flow calorimeter for enthalpy increment measurements on condensed gases is presented. A better knowledge of the properties of the liquefied natural gas is needed, and therefore a liquid loop has been designed for our flow calorimeter. The fluid loop in the calorimeter is designed in order to avoid the two-phase region, since two phases would give compositional disturbances in the measurements. The avoidance of the two-phase region is made possible by increasing the pressure of the test fluid after the measurement section, then heating the fluid at super-critical pressure past the critical point. Finally, the fluid is throttled to the low-pressure gas state at the inlet condition of the compressor that circulates the fluid. To perform the pressure increase, a new cryogenic pump has been designed. To evaluate the new equipment, measurements were taken on liquid ethane over the temperature range 146–256 K at pressure between 0.9 and 5.1 MPa.     

Refrigerators Enter a New Era of Health Preservation Frestech initiates the establishment of China's first standard for household sterilization refrigerators

On November 30, 2007, the China Association for Standardization (CAS) held a press conference at Beijing Diaoyutai State Guest House. Leaders from the China Household Electric Appliance Research Institute, the China Household Electric Appliance Association, and the China Consumers' Association attended and made speeches.……     

A study of centrifugal cast high boron high speed steel

In the present study a high‐boron high speed steel (HSS) roll material was designed. Many expensive alloy elements have been substituted by cheap boron alloy, and high‐boron high speed steel roll has been manufactured by centrifugal casting method. The microstructures, mechanical properties and wear resistance of centrifugal casting high‐boron high speed steel roll have been investigated by optical microscopy (OM), scanning electron microscopy (SEM), and X‐ray diffraction (XRD) analysis, hardness test, impact test and wear test. The results indicated that the solidification microstructures of high‐boron high speed steel roll consisted of M₂(B,C), (W,Mo)₂(B,C), M₃(B,C), M₂₃(B,C)₆ type borocarbides and martensite, a small amount of retained austenite. Borocarbides were continuously distributed over the grain boundary. After quenching from 1050 °C, local broken network appeared in partial borocarbides, and fine secondary borocarbide precipitated from the matrix. After tempering from 525 °C, the amount of precipitated borocarbide increased significantly. After heat treatment, the hardness of high‐boron high speed steel roll excelled 60 HRC, and its impact toughness excelled 8.0 J/cm². The single groove steel rolling amount of high‐boron high speed steel rolls increases by 500% than that of bainite cast iron roll, when the rolls are used in K₁ mill housing of bar mill.     

Optimum-Simulation von Ernteprozessen

Zusammenfassung Bei der Gestaltung von Ernteprozessen — beispielsweise des Prozesses Mähdrusch, Körnertransport und -abnahme — als transportverbundene Fließarbeitsverfahren mit mindestens zwei verschiedenen Arbeitsmitteln gibt es einen großen Optimierungsspielraum. Solche Prozesse sind mehrstufige Bedienungsprozesse mit gemischter Anordnung der Bedienungseinrichtungen. Außerdem besitzen sie stark ausgeprägte räumliche Aspekte. Es wird vor allem gezeigt, welche Merkmale solcher Prozesse in Simulationsmodellen abgebildet sein müssen, welche Zielgrößen in Abhängigkeit von welchen Einflußgrößen unter Berücksichtigung welcher Prozeßbedingungen ermittelt werden sollten und wie der Bewertungsprozeß zur Ermittlung der gewünschten Informationen gestaltet werden muß.     

Certification Becomes Important for the I Quality; and Safety Supervision of the Chinese Liquor Sector

The end of 2007, over 200 unit products of more than 80 Chinese firms have passed the quality grade certification for liquor products. These products involve distilled spirits, beer, wine, yellow wine, fruit syrup wine and others, and cover over 80% of the national top-branded liquor products.……     

Deposition and Coating Properties on CVD Tungsten

Surface characterization and microstructure studies are performed on chemical vapor deposited (CVD) tungsten coating. There is about 2 μm thickness diffusion layer of tungsten in the molybdenum substrate. The thermal shock test shows tungsten coating has good adhesion with molybdenum substrate, but the elements of oxygen and carbon in the tungsten coating have the bad affection to the adhesion. The result of high-temperature diffusion experiment is the diffusion rate from molybdenum substrate to tungsten coating is faster.