基于格子Boltzmann的采空区顶板冒落冲击波仿真方法

提出了基于格子Boltzmann的地下采空区顶板冒落的仿真模型(WD2G9模型)。将采空区顶板冒落的过程抽象为全重力活塞推进过程,结合D2Q9模型和D2G9模型将活塞推进所产生的压缩冲击波,在格子Boltzmann的离散网格上同样进行离散,随着时间的演化进行波动。在仿真过程中可以可视地观看冲击波的波动以及空气粒子的演化过程,观测空气速度、压力的变化情况。该方法为采空区顶板冒落灾害的预测和预防提供了新的途径。     

格构预应力锚杆在山区公路边坡滑坡治理中的应用

在对某山区公路边坡滑坡体的工程地质特征、成因及稳定性进行深入分析的基础上,提出采用格构预应力锚杆进行滑坡治理的方案,并对预应力锚杆的设计进行探讨。结果表明,利用格构预应力锚杆治理方案加固后的滑坡体的安全系数为1．59,符合规范要求,验证了方案的合理性。     

赋值格为险象识别格的一种非经典逻辑系统K#(Ⅰ)

建立了险象识别格的概念，并引进次大元，次小元，心脏，外壳，Boole型子格等相关概念，讨论其基本性质并给出若干例子，从而为进一步研究险象识别逻辑做好了准备．     

关于剩余格蕴涵代数中的准素滤子

在剩余格蕴涵代数中,提出准素滤子的概念.讨论了准素滤子与素滤子之间的关系和准素滤子与其格蕴涵同态像之间的关系.最后,得到了在格H蕴涵代数中,准素滤子和素滤子等价的结论.     

Numerical simulation of wind flow fields around buildings using the lattice Boltzmann method

This paper presents the simulation results of the wind environment around a single high-rise building and that around two tall buildings in tandem arrangement by using the lattice Boltzmann method with an aim to understand the ventilation issues around high-rise buildings in an urban environment. We analyzed the velocity distribution around the buildings and performed numericl simulations to reveal the formation and evolution law of the complex vortex system around the high-rise buildings. Numerical simulation results manifest a periodicity phenamenon in the process of the vortex evolution. For the case of two high-rise buildings, wind velocity in the space between the two buildings is very small, which is nearly a silent regime. Wind velocity above the front building is relatively larger and the maximum wind velocity is approximately 2.5 times the incoming wind velocity. The numerical results can be used in layout planning of high-rise residential buildings to create better environment for ventilation purpose in an urban area.     

带蕴涵算子的N元格蕴涵代数不等式的解

在格蕴涵代数中研究了带蕴涵算子的N元格蕴涵代数不等式,得到其有解的充分必要条件,同时还在b是L交既约元的情况下,找出该不等式的所有极大解,进而给出其具体解集.     

基于Lorenz混沌优化和时空混沌优化的图像分割

阈值分割是图像分割中的一种常用且有效的方法,其关键问题是搜索到最佳分割阈值.文中基于混沌优化理论,利用Lorenz混沌系统对图像进行了阈值分割,同时提出了一种基于耦合映象格子的时空混沌优化算法,并且将其应用于图像分割实验.实验表明,与Lorenz混沌优化算法相比,时空混沌优化算法用于阈值寻优能够给出更加理想的分割结果.     

恒定磁场下一维格子的两粒子关联研究

研究了稳恒均匀磁场情况赫伯德势作用的一维有限晶格粒子关联问题，求出能量和波函数的精确解，在此基础上求出磁化强度。计算表明：（1）处于外磁场中的一维格子系统，其能级没有赝三重态，只有赝单态。（2）系统的能量和磁化强度主要取决于外磁场，其次才是关联总动量Q。当η≤1时，无论Q为何值，系统能量和磁化强度均随外磁场增大而非线性减小。而η≥1，系统能量和磁化强度均随外磁场增而线性减小。     

A δ-function-like peak in the specific heat of two-dimensional vortex lattice: Monte Carlo study

A repulsive vortex-vortex interaction model was used to numerically study the melting transition of the two-dimensional vortex system with Monte Carlo method. Then a δ-function-like peak in the specific heat was observed and the internal energy showed a sharp drop at the melting temperature, which indicated that there exists a first-order melting transition at finite temperatures. The Lindemann criterion was also investigated and valid, but different from previous simulation results. Project supported by the Science and Technology Ministry of China (No. NKBRST-G19990646) and Zhejiang Provincial Natural Science Foundation (No. 199031)     

若干重要逻辑蕴涵算子的性质与比较

对十个重要逻辑蕴涵算子的性质进行了较全面的比较研究，得到了若干基二结果，它们在各逻辑系统的比较研究中有一定参考价值。