滑坡涌浪作用下弧形闸门动力响应数值分析

库岸滑坡是一种常见的地质灾害,滑坡体入库后诱发的涌浪可能会严重威胁库区内闸门结构稳定性。针对弧形钢闸门在滑坡涌浪作用下的动力响应问题,以某深孔弧形工作闸门为例,通过自编有限元程序模拟滑坡涌浪过程,将计算出的涌浪动水压力转化为闸门的节点荷载,基于动力时程法得到闸门动力响应,并结合闸门静力计算结果进行对比分析。结果表明,在滑坡涌浪作用下,主梁后翼缘和竖梁后翼缘的应力响应最大,闸门各个构件中支臂的位移响应最大;相比于正常蓄水位时的滑坡涌浪,死水位时的滑坡涌浪对闸门结构应力和位移响应的影响更大。     

ICS-XF4悬浮式电子皮带秤在斗轮堆取料机上的应用

文章介绍了ICS-L-XF4型悬浮式电子皮带秤的工作原理、结构和主要特点,同时介绍该产品在煤码头管理处斗轮堆取料机上的应用.     

连续退火炉余热回收技术应用与节能方案

冷轧带钢连续退火炉机组排烟温度高、耗能大是普遍存在的问题。为了提供一些退火炉节能降耗技术方面的参考方案,以宝钢四冷轧为分析对象,对冷轧带钢连续退火炉的几种余热回收方式进行了比较,并讨论了各种余热回收形式的优缺点,认为“过热水回收技术”是比较便捷的余热回收方式,并通过分析一个热平衡测试实例,找出余热回收以外的几种在退火炉本体可以实施的节能方法。     

钨丝增强锆基非晶合金复合材料动态变形特征研究

利用分离式霍普金森压杆(SHPB)装置,对体积分数为60%和80%的钨丝增强锆基非晶合金复合材料进行了动态压缩实验,采用 X 射线衍射仪(XRD)和扫描电子显微镜(SEM)研究了复合材料的原始组织以及动态变形特征和断口形貌。结果表明:在动态压缩载荷作用下,W 丝/Zr 基非晶复合材料没有明显的屈服现象即发生断裂;试样的动态压缩强度随着钨丝体积分数的增加而增加,体现了钨丝增强体对复合材料显著的强化作用;试样发生剪切断裂和纵向劈裂,在变形过程中钨丝发生劈裂并有屈曲失稳和翘起,非晶基体表现为软化后的脉状花样和脊状形貌,钨丝体积分数的不同,复合材料呈现出不同的断口特征。     

散装办工作到位 落实政策不留死角

德州散装办在贯彻国务院七部局令过程中不留死角，认真检查建设行政部门管理以外的工程，使推散工作再上新台阶。德州散装办认真贯彻《国务院对进一步加快发展散装水泥意见的批复》和省政府文件，坚持以法推散，实行规范化管理，经过几年的努力，德州市建筑市场用散基本走向正规化，散装水泥使用量不断增加。     

Three-Dimensional Simulation of Plasma Jet and Particle Groups in Plasma Spraying

The temperature field, velocity field, as well as species distribution in three-dimensional space are successfully calculated by establishing three-dimensional geometry model and solving plasma jet-substrate interaction equations, optimized particle trajecory models, as well as particle-particle heat transfer equations in three-dimensionalal space. Under typical working conditions, the flying trajectories and distribution of ZrO2 ceramic particles and Ni metal particles are also simulated. Results show that, the plasma jet becomes wider near the substrate, and the stochastic trajectory model is preferable to simulate the turbulent diffusion effect of particles. In addition, Ni metal particles penetrate relatively more deeply than ZrO2 ceramic particles due to larger density.     

基于RGB分量统计的可变区域彩色图像分割算法*

为了能够对彩色图像进行高效的分割,提出了一种可变区域的图像分割算法,利用基于图像全局RGB分量统计信息的活动轮廓模型进行曲线演化,并使用水平集表示轮廓。通过改变和缩小分割区域的策略,将分割过程分为多个阶段进行。在灰度图像的分割算法的基础上,将可变区域策略拓展到彩色图像。实验结果表明,图像中多连通区域的物体能够被准确且快速地分割出来。与现有模型相比,可以自动地完成工作而无须人工干预,并且算法快速方面有明显的改进。     

Influence of coexisting substances on the photodegradation behaviors of 17α-ethinylestradiol (EE2) in the UV/H2O2 process

The batch photodegradation reactor was used to investigate the influence of the common coexisting substances in wastewater,such as H +,anions(HCO3-,C1-and NO3-)and organic compounds(methanol and bisphenol A),on the photodegradation behaviors of EE2 in the UV/H2O2 process.The results indicated that the addition of coexisting substances can influence the photodegradation behaviors of EE2 and it also follows the first-order kinetics.The acidic(pH 2-4)and alkaline(pH 10-12)medium benefit the photodegradation of EE2,but the photodegradation rale constant of EE2 keeps almost constant in the pH value of 4-10.The addition of anions,such as HCO3-,Cl-and NO3-,can inhibit the photodegradation of EE2,and the rate constant has a negative linear relationship with the concentration of the anions.However,the reduction degrees vary with the anions kinds,and the inhibition effect of the three anions is in the order of HCO3-＞ NO3-＞ C1-.Addition of 5 mg/L methanol and bisphenol A can reduce the photodegradation rate constant of EE2by 84.31％ and 72％,respectively.By comparison,the retardant effect of methanol is much more evident.In the studied concentrations range,the photodegradation rate constant of EE2 is the unary quadratic function of the organic compounds concentrations.