拱型波纹屋盖风荷载数值模拟研究

基于谐波叠加法的基本原理,结合快速傅立叶变换,利用MATLAB编写了拱型波纹屋盖多点互相关的脉动风速程序.程序运行结果表明,结构各点模拟脉动风速时程的功率谱密度函数与目标函数、风速时程的自相关函数与目标自相关函数较为一致;相邻两点之间距离越近,互相关性越强,反之,则越弱.该研究结果对进一步研究拱型波纹屋盖结构风致振动时域分析具有重要意义.     

浅析鲁迅小说创作的民族性建构

鲁迅小说是民族文学的瑰宝,它是中国的传统与现实激发出来的产物。探讨鲁迅小说的民族性建构,对于思考在当下“全球化”语境中如何使我们的文学创作具有生命力有着方法论上的意义。     

新集一矿推覆体夹片下150801工作面防水煤柱留设可行性研究

新集一矿150801工作面位于阜凤下夹片断层下,8煤顶板距离上覆下夹片断层46～88m,在局部地段,采动后的导水裂隙带有可能波及下夹片断层带,导致夹片断层带水及夹片灰岩水涌入矿坑,严重危及150801工作面的安全回采。通过对夹片灰岩的分布规律、赋水性、8煤顶板岩性特征的分析以及涌水量和最大导水裂隙带高度的计算,综合评价150801工作面防水岩柱留设的可靠性。     

煤巷锚索支护机理分析及其应用

结合高地应力、复合顶板等复杂地质条件,研究深井条件下煤巷锚索采用小孔径、施加高预应力的结构形式和施工工艺,工程实践表明,该技术是解决深井高应力软岩巷道、大断面交岔点等支护难题的有效途径。     

Playing surface and UK professional rugby union injury risk

Artificial rugby union playing surface installation is increasing. This prospective cohort study aimed to examine the effect of playing surface on match injury types within 157 players of two UK professional rugby union clubs playing 209 matches (96 on artificial surfaces and 113 on grass) over three seasons. There was no difference in overall injury risk between the two playing surfaces with injury incidence on artificial 80.2 (CI 69.9–91.7) and on grass 81.9 per 1000 match-hours (CI 72.2–92.5), with an incidence rate ratio (RR) of 0.98 (CI 0.82–1.17). There was a higher rate of concussion (RR 0.52, CI 0.34 – 0.78) and chest injuries on grass (RR 0.26 CI 0.07, 0.95), and a higher rate of thigh haematoma (RR 2.25, CI 1.05–4.82) foot injuries (RR 4.12, CI 1.10, 15.40) and injury to players being tackled (RR 1.46, CI 1.00, 2.15) on artificial. Whilst there was no higher injury risk for matches played on artificial versus natural grass surfaces, the higher incidence of concussion and chest injury on grass, and the higher rate of foot injuries on artificial surfaces may be related to tackle and footwear-to-surface interface factors.     

浅析屋顶花园的绿化设计

简述了屋顶花园的发展起因、功能作用、绿化设计与应用技术进行了简要地分析和研究,使屋顶的自然生态环境与城市总体生态环境融为一体,使城市生态文明与生活环境文化相融合的目的。     

采场顶板失稳机理的分析及控制

采煤工作面顶板状况直接关系煤矿的安全生产和经济效益。本文从影响顶板稳定的因素入手,分析了全部垮落炮采工作面的顶板失稳的机理,同时提出了有效控制措施。     

面对情感冷漠,语文如何作为

当下青少年中存在较为普遍的情感冷漠现象面对这种状况，本文从社会价值标准、学校思想教育和家庭教育三方面探索了情感冷漠症的根源，并试图从语文教师及语文教育与社会、家庭的联系中找到克服冷漠症的途径     

屋面防水几种施工类型及预算分析

结合实际工程,由屋面防水三种类型施工的优缺点、适用范围及预算造价分析可知,机砖水泥砂浆做屋面防水,在实际施工中是最经济、简便的防水做法．杜绝不合格材料进场,选择责任心强、素质高的施工队优,严格按图纸设计及有关要求规范施工,才能达到最佳效果．     

Green roofs for storm water management: a review

The rapid urbanization and industrialization involve an unsustainable use of natural systems,leading to various problems in cities.The urban hydrological system experiences fluctuating amount of surfac...