单层柱面正交异型网壳的动力特性研究

结构的动力特征值是抗震设计的主要依据。本研究应用有限元方法,对支承于刚性边梁的柱面正交网壳的动力特性进行分析,计算了不同边界条件下结构的自振频率及振形。通过对动力特性的分析,得出了一些对柱面正交异型网壳抗震设计有用的结论。     

杨树速生丰度林施肥方案初探

通过对奈曼八仙筒林场采用不同施肥时间、施肥量、施肥方式及间作等因素对杨树速生丰产林林木生长量影响的试验，利用正交设计分析，选择最佳施肥方案。     

概念格理论与方法研究

概念格作为一种研究概念内涵与外延的有效工具,在规则提取与数据分析方面有着广泛的应用。讨论了概念格的构造、约简与规则提取,以及模糊概念格的相关内容,并对各种建格算法、约简算法加以论述,分析其与粗糙集的关系,最后提出了未来概念格的相关研究方向。     

Parallel Operating the 13-Bit Lattice Gas Automata Model

The parallel operation mechanism of 13 Bit lattice gas automata model, which can quickly compute and include more sites, is presented. Via coding and computing for particles of sites by bit, the parallel computing is achieved by transfering the particles propagation and collision into its backup and reloading. This mechanism can simulate correctly and validly some fluid motion with complex geometry boundary, such as flow through coke porous media. [WT5HZ]     

Windows环境下字体的点阵技术

Windows环境下提供了大量的矢量字库,具有字体非常丰富、添加新的字库比较容易等特点．但在实际应用中,难点是如何能把矢量字变成点阵字来显示．文中通过DELPHI编程,实现了这一转换,并在广告牌上的显示得到了应用．利用将显示汉字指令放在工控机中,上位机通过输出的点阵二进制数来控制广告牌上的显示汉字．并给出了实例．     

Three-dimensional modelling of wood fracture in mode I, perpendicular to the grain direction at fibre level

A coupled experimental and numerical modelling approach was used to investigate the mechanism of softwood fracture at the fibre level. First, a three-dimensional mixed lattice-continuum fracture model was developed to investigate the mechanism of wood fracture, taking into account the porosity of its structure and its heterogeneities at the fibre level. The critical volumes in the specimen where crack propagation was more probable were modelled by a lattice that could show the alternation of earlywood and latewood fibres, and the other regions were considered as the continuum medium. The proposed model was used to investigate the mode I fracture of a small softwood sample in RL orientation. Secondly, a method was developed for microscopic observation of the crack trajectory and investigating the mechanism of initiation and propagation of cracks. This approach was used for microscopic investigation of the fracture behaviour of spruce specimens in mode I and RL orientation. The results of the numerical study were compared with the experimental results. The prepeak and postpeak behaviour of the obtained stress-displacement curve and also the crack opening trajectory in cross-section and longitudinal section in the model and experiments were in good agreement. Both the model and the microscopic observation showed that in mode I fracture and RL orientation, the main trajectory of the crack propagates in the earlywood ring.     

概念格理论与方法研究

概念格作为一种研究概念内涵与外延的有效工具,在规则提取与数据分析方面有着广泛的应用。讨论了概念格的构造、约简与规则提取,以及模糊概念格的相关内容,并对各种建格算法、约简算法加以论述,分析其与粗糙集的关系,最后提出了未来概念格的相关研究方向。     

关于有限布尔代数的原子的性质

本文研究了有限布尔代数的原子问题，给出了关于有限布尔代数的原子的一些性质。     

简单离子晶体离子半径比的计算

介绍了关于简单离子晶体中离子半径比的计算方法,给出了一个适用于各种类型简单离子晶体的一般公式,具有简便直观,易掌握之优点.     

基于单形格子设计的马铃薯微型薯繁育基质配方研究

试验采用盆栽法,用混料试验设计中{3,3}单形格子设计,建立繁育马铃薯微型薯高产优质的基质配比模型,根据试验马铃薯的单株块茎重、单株块茎数、单块茎重、合格薯率、大中薯率,分析优化菌渣、河沙、珍珠岩3种基质的配比。研究表明,高产稳产优质的马铃薯微型薯繁育基质配比为45.60%∶30.02%∶24.38%。