多位优化原则下旅游管理专业实习基地建设探索——以华商学院旅游管理系为例

旅游管理专业实习基地的建设在实践教学体系中发挥着关键性的作用。本文结合华商学院旅游管理系迎评工作,对旅游管理专业实习基地建设的指导思想、规划方向、原则和实施等方面进行研究,以期更好地促进实践教学质量的提高。

“煤-水”双资源型矿井开采技术方法与工程应用

由于我国东、西部地区煤-水资源呈逆向分布,为解决煤炭资源安全绿色开发、水资源供给、生态环保之间的尖锐矛盾和冲突,实现煤矿区水害防治、水资源保护利用、生态环境改善的多赢目标,在阐述"煤-水"双资源型矿井开采概念与内涵的基础上,提出了根据矿井主采煤层的具体充水水文地质条件优化开采方法和参数工艺、多位一体优化结合、井下洁污水分流分排、水文地质条件人工干预、充填开采等"煤-水"双资源型矿井开采的技术和方法。以蔚县矿区兴源矿为工程背景,提出了松散含水层下薄基岩区房式保水开采方案,建立了煤房"固支梁"力学模型,提出了基于让压理论的煤柱设计方法,修正了屈服煤柱上覆载荷计算公式。结果表明:主关键层的存在和稳定扩大压力拱的形成是屈服煤柱设计的关键,且屈服煤柱具有足够的强度支撑扩大压力拱下方的覆岩重量;采5留4、采5留5、采6留5等方案具有可靠的安全系数。

Multi-objective optimization of active steering system with force and displacement coupled control

A novel active steering system with force and displacement coupled control(the novel AFS system) was introduced,which has functions of both the active steering and electric power steering.Based on the model of the novel AFS system and the vehicle three-degree of freedom system,the concept and quantitative formulas of the novel AFS system steering performance were proposed.The steering road feel and steering portability were set as the optimizing targets with the steering stability and steering portability as the constraint conditions.According to the features of constrained optimization of multi-variable function,a multi-variable genetic algorithm for the system parameter optimization was designed.The simulation results show that based on parametric optimization of the multi-objective genetic algorithm,the novel AFS system can improve the steering road feel,steering portability and steering stability,thus the optimization method can provide a theoretical basis for the design and optimization of the novel AFS system.