摘要：To overcome the drawbacks of the conventional foam technology used for dust suppression,including large pressure loss,high water pressure and low driving pressure,a new pneumatic foaming system is *** an original design of foaming agent mixing device is proposed,and its performance is investigated and evaluated under different pressure *** results show that the maximum absorption amount increases by 2.9-6.7 times at a pressure compensation of 0.04-0.2 MPa compared with no pressure *** pressure loss and pressure fluctuation both reduce significantly with increasing pressure *** critical outlet pressure increases by30.4-240%.Field application indicates that the proposed mixing device ensures the reliable addition of foaming agent used for foam dust *** effect of foam on dust suppression is remarkable,and the economic cost of foam is ***,there is reason to believe that the new mixing device will greatly promote foam technology to be widely used for suppressing dust in underground coal mines.

摘要：To study the flow characteristics of three-phase foam in gob area,different perfusion experiments in coal mine gob were designed and put forward in the *** the observation of flow range,flow characteristics of three phase foam were analyzed with different flow ***,unsteady seepage process of three-phase foam was simulated with CFD *** on experiment and numerical simulation results,flow characteristics of three-phase foam and its major influence factors are discussed,and the optimal arrangement distribution of mine fire control drills is also *** results show that the flow range and stacking height of three-phase foam in gob are significantly influenced by *** vertical stacking height and horizontal diffusion distance of three-phase foam are also directly related to the flow volume of foam perfusion,the larger flow single hole perfusion volume,the higher stacking height and the longer diffusion distance could be obtained.

摘要：In order to improve the utilization rate of foam,an arc jet nozzle was designed for precise dust *** theoretical analysis,the different demands of foam were compared amongst arc jets,flat jets and full cone jets when the dust source was covered identically by *** is proved that foam consumption was least when an arc jet was *** production capability of an arc jet nozzle under different conditions was investigated through *** results show that with the gas liquid ratio(GLR)increasing,the spray state of an arc jet nozzle presents successively water jet,foam jet and *** a reasonable working condition range of foam production and a fixed GLR,foam production quantity increases at first,and then decreases with the increase of liquid supply *** the inner diameter of the nozzle is 14 mm,the best GLR is 30 and the optimum liquid supply quantity is0.375 m^3/*** results of field experiments show that the total dust and respirable dust suppression efficiency of arc jet nozzles is 85.8%and 82.6%respectively,which are 1.39 and 1.37 times higher than the full cone nozzles and 1.20 and 1.19 times higher than the fiat nozzles.

摘要：为合理改善既有校园复合功能空间普遍存在的舒适性差、空间活力低的问题,使用后评估方法为建筑空间的绿色改造设计提供了新的思路和工具。以沈阳建筑大学为例,选取长廊复合功能空间为研究对象。从主观感受层面,运用语义分析法(Semantic Differentia, SD)法与统计学方法,进行数据收集,并计算影响因子的满意度均值与权重;从客观指标层面,通过物理指标监测,获取温湿度、亮度、A声压级等数据,并依据国家规范计算达标率,从而遴选出影响空间感受的3个重要因素:空间感知、物理指标、自然环境,以此进行复合空间的绿色性能改造设计,优化了能源利用效率,提高了空间舒适度。采用调查问卷、诊断式访谈、仿真模拟等方式对改造设计方案进行预评价,论证了改造方案的有效性与合理性。旨在通过“使用-设计”互馈的方式,对高校复合功能空间的高效利用提供参考。

摘要：For further understanding of self-heating of coal,we tested the reactions of seven different ranks of coal under inert *** the test,50-gram of coal sample ranged from 0.18 mm to 0.38 mm was put into a special designed copper reaction vessel and let pure nitrogen to flow into the coal sample from the bottom at a rate of 100 mL/*** programmed temperature enclosure was run at a programmed rate of 0.8 °C/*** concentration of the carbon oxides and the coal temperature were *** results show that the coal reactions under inert atmosphere can generate CO and *** reactions under inert atmosphere are affected by coal ranks,initial pore structure of coal and sulfur *** low ranks of coal,the productions of carbon oxides are *** coal temperature is lower than the surrounding temperature throughout the reactions under inert atmosphere,but it rises quickly and reaches a crossing point temperature in the later stage under dry-air *** on the analysis,it indicates the self-reaction of initial active groups exists in the self-heating of coal besides the reactions in the two parallel reactions *** combustion of coal is due to both the oxidation heat accumulation and the chain reaction.A new reaction model of self-heating of coal was proposed.

摘要：锂靶是^(7)Li(p,n)^(7)Be型硼中子俘获治疗装置中的关键部件。为设计一种可绕中心轴旋转的半轮胎状曲面结构的复合材料Li靶,采用蒙特卡罗工具包TOPAS模拟2.5 MeV、20 mA质子束入射不同径轴比的曲面锂靶对出射中子角分布、能谱和通量的影响,采用ANSYS模拟了该靶的稳态温度分布。模拟结果表明:半轮胎状曲面结构的设计使得出射中子束更加集中,当径轴比为1.5时,出射角为0°~45°的中子数为相同情况平面靶的2.59倍,大于90°的中子数仅为相同情况平面靶的0.29倍。该曲面结构和褶皱水道设计使其散热性能也更优,对于50 kW的入射质子束,锂层稳态最高温度仅100℃,满足其散热要求。该新型曲面中子靶相比于传统平面靶极大地提升了出射中子的前向性和散热性能,在硼中子俘获治疗领域具有良好的应用前景。

摘要：进一步的理解煤自我加热被调查煤的不同等级的交叉的点温度(CPT ) 获得。测试为煤用一个自我设计的试验性的系统被执行自我加热。50 g (???

摘要：合院原型作为中国本土建筑类型的典型代表之一,在当代高密度城市背景下发展成新的建筑形式过程中,面临功能空间再分配、私密与开放空间秩序转换以及与自然环境融合的需求。通过案例精读挖掘传统合院的内在形式逻辑,从空间结构、组织秩序、虚实关系三个方面归纳出合院原型营建信息的三种图式,即“九宫”宇宙图式、层级嵌套图式、“阴阳”相生图式,结合具有代表性的合院实践案例进行解析。从形式生成视角,探寻合院原型拓扑再现、分形加密、竖向叠落三种操作性的重构设计策略。

摘要：针对制造企业内车辆物流水平低、效率低、成本高等问题,考虑多车型、多品种货物以及车辆排队等待、车辆数量受限等因素,建立以总物流完成时间、总行驶里程、总物流成本为目标的车辆配置与路径协同优化模型。针对问题特征,提出一种混合离散麻雀搜索算法进行求解。在算法中,设计基于Tent混沌序列的反向学习初始化策略,以提高种群的多样性;针对不同麻雀种群,设计离散化策略以适应问题的离散特征;结合车型与路径特征,构造多种局部搜索策略,以提高算法的局部搜索能力;引入模拟退火Metropolis准则,并设计多目标解的保留策略,以避免算法陷入局部最优。通过对某水泥企业的实际车辆物流案例分析,验证所提策略的有效性以及所提算法的优越性。所得物流方案可以有效降低11%的物流成本,提高19.8%的物流效率,并减少29.1%的车辆行驶里程。

摘要：研究四种自然冷源引入方案对满载货物自然冷源和机械制冷双向切换库贮藏环境的影响,为双向库自然冷源制冷系统的设计提供参考。采用计算流体力学方法,对自然冷源四种引入引出方案分别建立模型,研究不同方案下货物区温度场和速度场的分布特点。不同方案时冷库内流场特点相差很大。其中,采用上进下出方案时货物区温度标准差最小,库内温度保持在合理范围,货物中间层和底层平均流速相对较高且均匀,分别为0.38 m/s和0.78 m/s,能够很好的保证换热效果。结论:自然冷源引入引出方式对双向库货物贮藏环境影响很大,设计时应注重考虑不同方式对库内空气流动性的影响。本文中上进下出方案相对更佳,能够为货物提供一个良好的贮藏环境。