“灯芯效应”下珊瑚骨料混凝土氯离子传输行为

研究了“灯芯效应”下珊瑚骨料混凝土在Mg²⁺、SO₄^2-共同作用下Cl^-的传输规律，建立了“灯芯效应”下珊瑚骨料混凝土Cl^-传输模型.结果表明：Cl^-沿半浸泡混凝土高度方向由下而上传输的同时也由表层向中心传输，其在混凝土内部的含量呈类抛物面分布；SO₄^2-的存在会加快Cl^-在混凝土中的传输，而Mg²⁺的加入会抑制Cl^-的传输，导致混凝土在相同高度及深度处的Cl^-含量小于SO₄^2-与Cl^-共同作用下的Cl^-含量；本文建立的“灯芯效应”下珊瑚骨料混凝土氯离子传输模型计算结果与实测结果吻合良好.     

Pressure Drop Models for Gas/Non‐Newtonian Power‐Law Fluids Flow in Horizontal Pipes

Models commonly used in literature are evaluated versus 696 data points to predict the pressure drop of gas/non‐Newtonian power‐law fluids flow in horizontal pipes. Suitable models are recommended. A new correlation is developed by ignoring the pressure drop across the gas slug and adopting the liquid slug holdup of gas/non‐Newtonian fluid flow into the homogeneous model. The theoretical curves can capture the test data trends and the overall agreement of predicted values with experimental data is sufficient to be practically applied in industry.     

西钢提高连铸中间包寿命生产实践

通过对连铸实际生产过程中影响中间包使用寿命的原因分析,制定提高中间包使用寿命的措施,并在生产实践中取得了预期效果.     

ATOX50生料磨产量下降的问题及处理

<正>1存在的问题我公司生料磨型号为ATOX50,该立磨自2008年3月投产以来,磨况较稳定。截止到2015年夏季,为了满足更严格的环保排放要求,窑尾电收尘更换为电袋复合型收尘器。技改收尘后,收尘效果提高,粉尘含量由25 mg/m~3下降到15 mg/m~3左右,收尘器进出口压差由1 500 Pa增加到2 500 Pa左右,运行阻力增加较多;磨机台时产量下降了25 t/h,磨机振动在0.5~0.7mm之间,压差偏高达6700~7200Pa,料层     

CuAlCl4 doped MIL-101 as a high capacity CO adsorbent with selectivity over N2

A CuAlCl₄ doped metal organic framework, CuAlCl₄@MIL-101, was prepared by introducing CuAlCl₄ into the pores of MIL-101 for the selective adsorption of CO over N₂. The CuAlCl₄ molecules were evenly distributed into various pores sizes and did not change the intrinsic structure of the MIL-101. Isotherms for CO and N₂ adsorption at 298 K showed that the CO capacity on CuAlCl₄@MIL-101 was much higher than that on virgin MIL-101, whereas the N₂ capacity decreased. The selectivity for CO over N₂ improved from 4.64 to 31.5 at 298 K and 1 bar. The CuAlCl₄@MIL-101 adsorbent displayed outstanding CO adsorption stability and the adsorbent could be regenerated by applying a simple vacuum of 4 mmHg.     

谈修辞手法在水景营造中的应用

结合园林水景多变的状态、多变的感官感受、多变的意境特征,对排比、通感、夸张、引用、比拟五种修辞手法在水景营造中的应用技巧进行了探讨,指出在水景的营造中适宜地运用修辞手法可使水景设计更加合理、动人,从而提高景观品质。     

涂料中可溶性Pb、Cr含量测定结果误差原因分析

研究并详细讨论了涂料样品制备与样品前处理过程中,各个因素对可溶性Pb、Cr含量测定结果的影响。结果表明:漆膜的厚度、粒径、提取液的酸度、温度等因素对结果的测定有较大的影响,应当对这些因素予以控制以提高实验室间结果一致性。     

Study on purification and application of novel precipitant for ceria-based polishing powder

Novel precipitant prepared through carbonation with MgCl2 wastewater generated from rare earth extraction separation process and low-price dolomite as raw materials was studied in this paper. The purification methods of novel precipitant by adding appropriate oxidizing agent were studied. It was found that optimal purification result could be achieved with sodium hypochlorite as iron removal reagent and the iron removal rate could reach up to 90% when the adding amount was 0.1 vol.%. During the preparation, the particle size and distribution of ceria-based polishing powder were affected obviously by the parameters such as concentration, reaction temperature and feeding rate. The results showed that ceria-based polishing powder with D50 =2.5-3.5 μm and the particle size distribution of 0.65-0.75 μm could be prepared when the concentration of CeCl3 was 0.6 mol/L, the reaction temperature was maintained at 50 °C and the feeding speed was controlled at 25 ml/min. Compared with commercial powder, the self-made polishing powder had roughly the same cutting amount, but the surface finish of polished glass was better than that of commercial polishing powder.     

Compressive sensing-based wind speed estimation for low-altitude wind-shear with airborne phased array radar

An important issue in low-altitude wind-shear detection is to estimate the wind speed of wind field. In this paper, a novel method for wind speed estimation with airborne phased array radar is proposed by combining space time adaptive processing and compressive sensing. The proposed method is able to achieve accurate wind speed estimate in the condition of limited number of sampling pulses, as demonstrated by numerical examples.