摘要：Non-pillar mining technology with automatically formed roadway is a new mining method without coal pillar reservation and roadway *** stability control of automatically formed roadway is the key to the successful application of the new *** order to realize the stability control of the roadway surrounding rock,the mechanical model of the roof and rib support structure is established,and the influence mechanism of the automatically formed roadway parameters on the compound force is *** this basis,the roof and rib support structure technology of confined lightweight concrete is proposed,and its mechanical tests under different eccentricity are carried *** results show that the bearing capacity of confined lightweight concrete specimens is basically the same as that of ordinary confined concrete *** bearing capacity of confined lightweight concrete specimens under different eccentricities is 1.95 times higher than those of U-shaped steel *** comparing the test results with the theoretical calculated results of the confined concrete,the calculation method of the bearing capacity for the confined lightweight concrete structure is *** design method of confined lightweight concrete support structure is established,and is successfully applied in the extra-large mine,Ningtiaota Coal Mine,China.

摘要：研究并测试了一种能够在水平至竖直壁面上移动的振动驱动爬壁机器人样机,可开发用于铁质壁面结构视检等高危工作.设计了一种具有非对称刚度的弹性底板,以转子振动电机-弹簧作为致动器,基于库仑干摩擦模型,建立了振动驱动爬壁机器人的动力学模型.通过数值仿真研究了机器人的爬壁运动特性,分析了致动器激振频率、壁面倾角和永磁铁吸引力对机器人平均速度的影响规律.对振动驱动爬壁机器人样机进行了壁面运动实验验证.结果表明,通过合理配置永磁铁吸引力和致动器激振频率能够有效提高该机器人的平均速度,并在30°壁面和90°壁面上分别实现了10.6 mm/s和16.7 mm/s的平均爬壁速度,通过调控激振频率可实现前进与后退运动的切换.

摘要：Exciton(or spin)statistics is a physical principle based on the statistics of spin *** electroluminescence,injected electrons and holes have randomized spin states,and usually form singlet or triplet excitons in the ratio of 1:*** statistics determines that the upper limit of internal quantum efficiency is 25%in fluorescent devices,since only singlet exciton can decay ***,both experimental and theoretical evidence indicate that the actual efficiency can exceed the exciton statistics limit of 25%by utilizing materials with special electronic structure and optimized device *** results bring light to break through the exciton statistics limit and develop new-generation fluorescent materials with low cost and high ***,the exciton statistics,which has attracted great attention in the past decade,is being rejuvenated due to the discovery of some fluorescent materials with abnormally high *** view of their significance in theoretical research of organic semiconductors and developing new-generation OLED materials,such materials are widely investigated in both academic institutions and *** key issues still require further clarification for this kind of materials,such as the molecular design ***,we review the progress of the materials with efficiency exceeding the exciton statistics limit,and the routes to improve exciton utilization *** the end,we present an innovative pathway to fully harvest the excitons in fluorescent devices,namely,"hot exciton"model and relevant fluorescence material with hybridized local and charge-transfer(HLCT)excited state.

摘要：针对船舶固定式压力水雾灭火系统失效的问题进行分析,并提出针对性的整改措施。根据固定式压力水雾灭火系统的组成和工作原理,通过对常见缺陷进行研究、分析,找出具体的问题,针对不同的缺陷及其产生的原因,提出解决方案和整改措施。分析结果表明,由于缺乏维护保养、设计缺陷、建造遗留等原因,该系统通常存在较多的缺陷。结合检验工作实际,通过梳理日常检验工作中遇到的问题,对船舶固定式压力水雾灭火系统常见缺陷进行分析,并给出整改方法和措施,以供船舶检验、船舶管理和船舶修理参考。

摘要：近年来,民用建筑行业BIM技术得到迅速发展,将其应用于有色冶金矿山设计工作势在必行,改变以往人工计算、应用AutoCAD插件出图的现状。为实现排土场参数化设计,结合排土场设计经验和计算机语言,基于Civil 3D部件编辑器(SAC)研究了参数化设计流程;针对排土场横断面形式,创建了多级边坡部件参数化模型,实现了快速建模、三维模型到二维图纸的转换以及排土场库容精确计算。基于SAC的排土场三维参数化设计技术促进了设计效率和精度的提升,总结形成了参数化设计技术在排土场设计过程中的应用流程,为类似项目提供参考。

摘要：为了调节电网的稳定性,抽水蓄能电站需要频繁启停和变换工况运行,导致水泵水轮机容易进入S特性区,机组振动增加,并网失败。本文以模型水泵水轮机为研究对象,采用熵产理论详细分析了S特性区不同工况下的能量损失规律,明确了熵产率分布与内部流动结构的关系。结果表明:S特性区内近飞逸工况总熵产最大,约为设计工况的5.1倍,脉动熵产占据的比例接近80%,随着流量的减小,转轮熵产占比逐渐降低,活动导叶和尾水管的熵产占比增加。小流量工况转轮进口靠近下环位置首先出现了明显的漩涡,导致了活动导叶出口和转轮进口的高熵产区,随着流量进一步减小,漩涡逐渐向上冠转移,并且切向速度增大,在转轮进口形成挡水环,阻碍水流进入转轮,在无叶区内出现了环状分布的高熵产区。反水泵工况,水流在低压边与逆时针旋转的叶片撞击,导致水流很难进入叶片内部,形成了大尺度的回流涡结构;双列叶栅内充满大量涡结构,导致活动导叶吸力面的熵产率增大,并且向固定导叶传播。

摘要：朋辈互助教育是一种新型教育模式,它突破了传统的一元教育主体限制,组建一个理念认同、目标一致、信息共享、技能互助的利益共同体。在大学生创新创业教育中利用朋辈互助教育,可以在革新教学理念、优化教学设计、重塑教学平台和改革课程评价等方面形成共振效应,推进了大学生创新创业教育适应创新型人才培养的质量。

摘要：针对预应力衬砌张拉过程中易出现应力集中而导致张拉裂缝的现象,通过开展洞外地面足尺模型试验,提出了分级分步张拉顺序和质量控制指标。首先根据钢绞线摩阻测试计算出摩擦系数,随后应用上述张拉顺序和质量控制方法进行自动张拉,并采用磁通量传感器和混凝土应变计分别对钢绞线和内衬混凝土的应力变化开展实测。现场张拉试验结果表明:①钢绞线沿程预应力损失约16.3%,采用的双层钢绞线在实践中可保证较高的有效预应力;②对锚具槽进行分级分步张拉,可使内衬混凝土获得较均匀的封闭环向压应力环,平均压应力达-10.9 MPa;③提出的3项控制指标可进行量化管理,结合自动张拉技术可有效地保证张拉质量。

摘要：以北京某明代古城墙烧结粘土砖为研究对象,采用回弹法、超声法等无损检测方法对北京明代青砖进行力学性能测试,同时进行单轴抗压强度试验。在此基础上,采用线性函数式和幂函数分别将回弹值(Rebound Number)和超声脉冲速度(Ultrasonic Pulse Velocity)与强度试验结果进行拟合;同时,采用超声-回弹综合法(SonReb)结合线性拟合、非线性拟合和响应面分析法(Response Surface Methodology)建立了试块的强度预测模型,并对不同模型精度进行了对比分析。结果表明:采用综合法预测北京城墙砖单轴抗压强度具有更高的可靠性,其预测精度较使用单一的检测方法更为精确。研究结果可为快速无损获取古青砖强度指标提供依据和参考。

摘要：济宁市医药大厦位于闹市区,周边分布密集建筑群,紧邻城市主干道,且道路两侧敷设有丰富的地下管线,周边环境极复杂。大厦为框架-剪力墙结构,内部设有多部电梯及步行梯,结构复杂,管线密集。通过严密勘察周边地形、有效的预处理和精准的设计,采用定向倾倒的方式对大厦进行了拆除爆破。并根据大厦自身结构特点,创新地采用了预留北侧裙楼并封闭其门窗孔洞,以其自身结构阻挡飞石,形成自体防护方式。起爆后,大厦按预定方向倾倒,周边设施无一损毁,爆破有害效应,特别是飞石得到了有效控制,取得了圆满成功。