锥基波形前刀面硬齿面插齿刀构形方法与构形理论的研究

在深入剖析现有硬齿面插齿刀构形方法利弊的基础上,论述了锥基波形前刀面硬齿面插齿刀的构形方法与构形理论及其优越性。研究表明:新构形方法插齿刀较现有插齿刀构形精度可提高一倍以上,刀具主剖面负前角绝对值可提高2～5倍,刀具抗崩刃能力和整体寿命大幅度提高,完全满足高精度硬齿面插齿加工的需要。

两桩承台拉压杆模型的构形方法及关键参数取值研究

研究了两桩承台在3种典型受力工况下的拉压杆模型设计方法,分别对应于桥墩处于轴压、小偏压和大偏压的情形。给出了不同工况下拉压杆模型的定量化几何构形;研究并确定了拉压杆模型中的节点几何形状和尺寸、混凝土有效强度等关键参数的取值方法;最后,通过实例计算演示了应用拉压杆模型进行承台验算的一般流程,结果表明本文方法具有较好的可操作性和适用性。

论许慎“文”、“字”和“六书”之两级构形方法

许慎对汉字的构形，做了两个级次的划分。“文”、“字”为第一个级次，“六书”是第二个级次。汉字构形方法的这两个级次的分类，既体现了对汉字产生与孳乳过程的描述，又体现了汉字构形的具体特点，对于我们正确理解传统的汉字学理论和构建当代汉字构形学均具有重要的意义。

椭圆轨道编队飞行的构形变化控制方法

本文首先推导了椭圆轨道编队的一些典型构形模态，指出椭圆轨道卫星编队的模态不同于圆轨道的构形模态，是极为丰富的。然后，基于T—H方程的解析解，推导了副星在沿航向常值推力作用下的椭圆轨道编队的构形变化控制方法。本文推导的构形变化控制方法，通过合理的选择控制量的作用时刻，可达到大量节约燃料的目的。最后，给出仿真算例。

新构形法硬齿面插齿刀的数学建模与仿真

在提出一种硬齿面插齿刀的新构形方法 (锥基波形刀面硬齿面插齿刀 )的基础上 ,对新构形方法插齿刀进行了数学分析 ,建立了新构形法硬齿面插齿刀切削刃的空间数学表达式 ,仿真实验表明 ,该构形方法的空间切削刃曲线更接近XOY面与渐开螺旋面相交的理论渐开线。

论异形字的文化考古价值

异形字具有丰厚的文化考古价值。异形字是历史的概念,可以考见不同时代的文化信息;异形字是地域的概念,可以考见不同地域人们对事物的不同认知的文化信息;异形字是汉字自身发展的见证,可以考见汉字构形方法演进的轨迹;异形字是社会生活的产物,可以考见政治、文化、社会习俗对其的影响。

Modeling constitutive relationship of 6013 aluminum alloy during hot plane strain compression based on Kriging method

Hot plane strain compression tests of 6013 aluminum alloy were conducted within the temperature range of 613?773 K and the strain rate range of 0.001?10 s?1. Based on the corrected experimental data with temperature compensation, Kriging method is selected to model the constitutive relationship among flow stress, temperature, strain rate and strain. The predictability and reliability of the constructed Kriging model are evaluated by statistical measures, comparative analysis and leave-one-out cross-validation (LOO-CV). The accuracy of Kriging model is validated by the R-value of 0.999 and the AARE of 0.478%. Meanwhile, its superiority has been demonstrated while comparing with the improved Arrhenius-type model. Furthermore, the generalization capability of Kriging model is identified by LOO-CV with 25 times of testing. It is indicated that Kriging method is competent to develop accurate model for describing the hot deformation behavior and predicting the flow stress even beyond the experimental conditions in hot compression tests.

二氧化碳热泵热水器研究及产品开发

二氧化碳热泵热水器采用载冷剂(如水或空气)周期性往复流动方法(即"往复式变温换热原理"),实现载冷剂和二氧化碳冷媒(即制冷剂)蒸发过程的变温匹配,得到的循环过程类似于劳伦兹循环过程,能够良好换热。基于构形方法开发一种具有多尺度结构、耐高压的二氧化碳换热器。

A General Study of the Number of Assembly Configurations for Multi-Circuit Planar Linkages

This paper presents a general approach for determining the configuration number for any linkage: A kinematic cham (KC) can be divided into some basic kinematic chains (BKCs) and driving joints; there are only 33 kinds of BKCs with υ =1-4 independent loop, containing only R (revolute) joints and their configuration numbers are given; the configuration number of a KC equals to the multiplication of the configuration numbers of BKCs contained in the KC.

CO_2热泵热水器研究及产品开发

二氧化碳热泵热水器采用载冷剂(如水或空气)周期性往复流动方法(即"往复式变温换热原理"),实现载冷剂和CO2冷媒(即制冷剂)蒸发过程的变温匹配,得到的循环过程类似于劳伦兹循环过程,能够良好换热。基于构形方法开发一种具有多尺度结构、耐高压的二氧化碳换热器。

A New (2+1)-Dimensional KdV Equation and Its Localized Structures

A new （2＋1）-dimensional KdV equation is constructed by using Lax pair generating technique. Exact solutions of the new equation are studied by means of the singular manifold method. Bgcklund transformation in terms of the singular manifold is obtained. And localized structures are also investigated.

Bending stress of rolling element in elastic composite cylindrical roller bearing

A new structure design method of elastic composite cylindrical roller bearing is proposed, in which PTFE is embedded into a hollow cylindrical rolling element, according to the principle of creative combinations and through innovation research on cylindrical roller bearing structure. In order to systematically investigate the inner wall bending stress of the rolling element in elastic composite cylindrical roller bearing, finite element analysis on different elastic composite cylindrical rolling elements was conducted. The results show that, the bending stress of the elastic composite cylindrical rolling increases along with the increase of hollowness with the same filling material. The bending stress of the elastic composite cylindrical rolling element decreases along with the increase of the elasticity modulus of the material under the same physical dimension. Under the same load, on hollow cylindrical rolling element, the maximum bending tensile stress values of the elastic composite cylindrical rolling element after material filling at 0° and 180° are 8.2% and 9.5%, respectively, lower than those of the deep cavity hollow cylindrical rolling element. In addition, the maximum bending-compressive stress value at 90° is decreased by 6.1%.

Reconstructing bubble profiles from gas-liquid two-phase flow data using agglomerative hierarchical clustering method

The knowledge of bubble profiles in gas-liquid two-phase flows is crucial for analyzing the kinetic processes such as heat and mass transfer, and this knowledge is contained in field data obtained by surface-resolved computational fluid dynamics (CFD) simulations. To obtain this information, an efficient bubble profile reconstruction method based on an improved agglomerative hierarchical clustering (AHC) algorithm is proposed in this paper. The reconstruction method is featured by the implementations of a binary space division preprocessing, which aims to reduce the computational complexity, an adaptive linkage criterion, which guarantees the applicability of the AHC algorithm when dealing with datasets involving either non-uniform or distorted grids, and a stepwise execution strategy, which enables the separation of attached bubbles. To illustrate and verify this method, it was applied to dealing with 3 datasets, 2 of them with pre-specified spherical bubbles and the other obtained by a surface-resolved CFD simulation. Application results indicate that the proposed method is effective even when the data include some non-uniform and distortion.

Managing Accessibility- The Configurational Approach to the Inclusive Design of Urban Spaces

This paper concerns the theme of the universal accessibility to urban spaces, proposing the contribution of configurational approach to their inclusive design. Born in the first Nineties on the roots of the efforts and the studies for reducing material and architectural barriers for disabled people, such discipline extends its sphere and purposes so as to mitigate the effects of spatial exclusion of a wider and wider variety of human categories, up to virtually include any potential urban user. Several questions persuade that a merely functional approach, essentially based on the position of the located activities, cannot be said satisfying： only a configurational approach can account for the effects of the grid configuration on the actual accessibility of its spaces. Our research focuses on Italian urban settlements, which appear as ideal case studies, due to the typical consistency of their urban spaces, which, especially in the inner historical cores, are densely build, geometrically irregular and hence generally far from actually providing a universal material accessibility. Here the impedance of space is much more than a theoretical hypothesis and concrete interventions are generally requested to eliminate or reduce its barriers and to make space actually and safely usable. Rather than at indicating the technical solution of single urban problems, which of course are strongly different each other, the research aims at defining a method suitable for any local context. Such method, integrating into a reliable tool the configurational vision with the functional and interactional approach, will provide a hierarchy of urban spaces with reference to the necessity of their universal accessibility.

Morphological and ultrastructural changes in rat ovarian tissues after cryopreservation

Objective: The aim of the study was to observe and compare the effects of cryopreservation and thawing meth- ods on rat ovarian tissues. Methods: Twenty 5-6 weeks old SPF-SD female rats were randomly divided into two groups, with ten rats in each group. Freshly isolated ovaries saved as a control (group 1: fresh ovaries) in formalin-fixed or vitrified immediately after dissection (group 2: vitrified ovaries). Ovaries in vitrified group were processed into thin slices then cryo- preserved, stored in liquid nitrogen for 21 days, rapidly thawed and grossly examined. All of the collected ovaries underwent hematoxylin and eosin-stained paraffin serial sections and observed the microscopic evaluation in vitrified ovaries. Results: Grossly the vitrified ovaries turned pale color and the size was same as before freeze. The vitrified ovarian tissue had normal anatomical structures of cortex and medulla under the microscope and had no difference with the fresh control ovarian tis- sue. The number and distribution of the follicles were similar with the fresh ovarian tissue, but had smaller size and the gap between oocyte and the surrounding granulosa cells was increased. Few ooctyes were in irregular appearance however the morphology of follicular cells did not give a different appearance as compared to the fresh control ovarian tissue. Conclusion: Cryopreservation of ovarian tissues by vitrification method has some detrimental effect on the morphology of follicles but does not induce negative impact on the number, density and survival of the primordial ovarian follicles. However the whole follicle anatomical structures also had no significant changes.

Analytical-Numerical Modeling Approach for Calculation of the Structural Distortions after Welding and Thermal Straightening

The analytic-numerical hybrid model for calculating welding distortions in large welded structures is presented. Objective of the analytical model is the calculation of the plastic strains and their distribution after welding and thermal straightening process. The consideration of the essential physical relations is put into discussion. Afterwards the obtained plastic strains by the analytical calculation are loaded on an elastic FE-model of the structure and the distortions of the whole structure are predicted. The consideration of welding and thermal straightening scenarios and the assembling stages is done by taking into account the intermediate variation of the strain state at every processing step. The model is intended to be used for solving industrial tasks, i.e. intending acceptable precision and calculation time as well as low simulation costs. The application of the model is demonstrated on structures with many welds and straightening spots.

An Approach to Representing Heterogeneous Non-Uniform Rational B-Spline Objects

The representation method of heterogeneous material information is one of the key technologies of heterogeneous object modeling, but almost all the existing methods cannot represent non-uniform rational B-spline （NURBS） entity. According to the characteristics of NURBS, a novel data structure, named NURBS material data structure, is proposed, in which the geometrical coordinates, weights and material coordinates of NURBS heterogene- ous objects can be represented simultaneously. Based on this data structure, both direct representation method and inverse construction method of heterogeneous NURBS objects are introduced. In the direct representation method, three forms of NURBS heterogeneous objects are introduced by giving the geometry and material information of con- trol points, among which the homogeneous coordinates form is employed for its brevity and easy programming. In the inverse construction method, continuous heterogeneous curves and surfaces can he obtained by interpolating discrete points and curves with specified material information. Some examples are given to show the effectiveness of the pro- posed methods.

变异图形的探索与运用

在现代平面设计中(广告设计、包装设计、标志设计、书籍装祯设计等),设计师们除了运用写实图形、变形图形来表达自己的设计意图外,还常常运用变异图形这一比较特殊的构形手法来表达自己独具匠心的设计意图。变异图形由于其反传统的思维方法、超常规的构形方式。

Construction of A Kind of Wavelets

A method to construct wavelets on invariant sets is given, which can he used to construct nontensor-type multiwavelets，

BP-PSO-based intelligent case retrieval method for high-rise structural form selection

Modern architectures are developing in the direction of tall buildings and complex structures,and the theoretical analysis and the design experience have seriously lagged behind the construction of super high-rise structures.Structural form selection,especially the case based reasoning (CBR) based structural form selection,is a promising tool for the construction of high-rise structures.In view of the limit of cognitive ability of domain experts,a BP (back propagation)-PSO (particle swarm optimization)-based intelligence case retrieval method for high-rise structural form selection is proposed.The CBR-based case retrieval method and the construction of the BP-PSO neutral network are introduced.And then the BP-PSO-based case retrieval method is validated by some engineering cases.The results of training and prediction indicate that the proposed method has good ability to retrieve the cases of high-rise structures.