低合金耐海水腐蚀钢在模拟腐蚀环境下的耐蚀性能研究

以普碳钢为对比样,采用模拟海水全浸和间浸、盐雾、湿热等加速腐蚀实验并结合电化学测试技术研究了Cu-Cr-Mo系低合金耐海水腐蚀钢Q345C-NHY3的耐蚀性能.结果表明：在各种模拟环境条件下与碳钢相比Q345C-NHY3钢都具有较好的耐蚀性能.     

液压支架高压大流量阀综合试验台设计与仿真北大核心

针对液压支架高压大流量阀设计以双蓄能器组为辅助动力源的试验台,配合增压缸实现系统的分时快速加载。该试验台可为被试阀提供近乎阶跃的短时大流量高压冲击,模拟液压支架承受严重顶板冲击的工况。基于AMESim软件搭建试验系统的仿真模型,并以FAD100/40型安全阀为试验对象,进行冲击压力安全性和公称流量启溢闭特性仿真分析。结果表明:所设计的安全阀冲击安全性试验系统能在规定时间内达到国家标准规定的阀前冲击压力;公称流量启溢闭特性试验系统提供的被试阀开启压力、流量、压力上升梯度及公称流量溢流时间均满足国家标准,进一步验证了试验台及试验方法的合理性。     

结晶器液压振动技术在梅山高效连铸中的应用

为了得到较好的铸坯表面质量,满足生产高附加值、高技术含量的钢种要求,梅山炼钢厂在2#高效连铸机上引进了国际上较先进的结晶器液压振动技术,具体介绍了该结晶器液压振动技术的基本参数和实际应用。     

Energy Aspects in Drying

The energy performance of a dryer and a drying process is characterized by various indices such as volumetric evaporation rate, steam consumption, unit heat consumption and energy (thermal) efficiency. Of all indices, energy efficiency is the most frequently quoted, in technical specifications. A thorough analysis of available information, including the Handbook of Industrial Drying, points to the inconsistency of terminology, definition and data interpretation. Thus, reported data on energy efficiency vary significantly and frequently contradict both drying theory and industrial practice. To establish a common platform to deal with energy issues, this article provides a concise overview of the most common definitions of energy efficiency, along with a critical review of the published data. A need for energy audit and benchmarking is pointed out. To eliminate shortcomings of the energy efficiency as a lumped parameter, and to allow analysis of energy consumption over time (batch drying) or distance (continuous drying), instantaneous and cumulative indices are proposed. Using these indices, the energy performance of selected dryers is examined, and possible modifications to dryer design and operating parameters are indicated in order to reduce the overall energy consumption.     

循环流化床锅炉J形返料阀的试验研究

对循环流化床锅炉J形返料阀以充气口高度、J阀管径和J阀管转弯处圆弧段所包围的角度这3个因素作为影响J阀调节性能的结构因素 ,以物料流量和J阀充气量之间的线性相关系数、回归直线斜率和流量调节范围为优化试验指标 ,通过正交试验获得了J阀的最优结构     

Tube Diameter and Height Influence on the Ozonation Operating Conditions with a U-Tube

Ozone has been used for a number of years in water treatment for viricidal and bactericidal action, as well as for its oxidizing properties. Energy consumption during its use depends on the performance of the ozone generators, but also on the ozone transfer efficiency from the gas phase to the liquid phase. Therefore, it is important to use a contactor with a high transfer efficiency.A new ozonation reactor has been developed: the Deep U-Tube (DUT). This reactor works under pressure, which increases the saturation concentration of ozone at equilibrium (C ). and creates a great turbulence, which breaks the gas bubbles and increases the interfacial area of exchange. Further, this new contactor has a piston hydraulic behavior in the liquid phase, which leads to a very great efficiency and to a better reduction for all reaction kinetics.     

漏液的不均布对塔板效率影响

依据液体二维不均匀流动、二维涡流扩散模型，建立了在给定汽液平衡关系式条件下，提出了一个不均匀漏液对板上液体浓度分布影响的数学模型，在此基础上，采用差分法对该模型进行求解。讨论了在不同的参数（包括）下不均匀漏液对板效率的影响，以图表的形式给出。结果表明，漏液的不均布确实会对板效率产生重大影响，在计算板效率时应以漏液不均匀为条件。     

淋球菌培养基、氧化酶试纸及奈瑟氏菌快速糖试验试剂盒的检定和应用

应用新研制的淋球菌培养基（WGC）与意大利GC（IGC）和MTM培养基对照进行淋球菌生长试验，其敏感性基本一致。用已知菌株对氧化酶试纸和奈瑟氏菌快速糖试验试剂盒进行检定，亦呈现正确反应。应用WGC与IGC培养基培养9o3例临床标本，培养物经革兰氏染色和氧化酶试纸作初步检定，IGC卜淋球菌阳性402例，WGC上同时田位400例，两者符合率为99．5％，WGC上400例中，有366例用快速糖试验作证实试验，确诊为淋球菌者有364例，两者符合率为99．45％。     

O3/H2O2 Treatment of Methyl-terf-Butyl Ether in Contaminated Waters: Effect of Background COD on the O3-Dose

The destruction of methyl-tert-butyl ether (MTBE) in contaminated waters by O₃/H₂0₂ process was studied and the influence background COD, alkalinity, and hydrogen peroxide and MTBE concentrations on process treatment efficiency and ozone dosage was investigated. The treatment efficiency was evaluated by an Efficiency Index, which is based on electrical energy requirement for ozone production. It was found that the treatment efficiency decreases linearly with increasing concentrations of MTBE at constant background COD and with background COD at constant MTBE concentration. A simplified kinetic scheme was presented to account for these observations.     

Competitive online adaptive scheduling for sets of parallel jobs with fairness and efficiency

We study online adaptive scheduling for multiple sets of parallel jobs, where each set may contain one or more jobs with time-varying parallelism. This two-level scheduling scenario arises naturally when multiple parallel applications are submitted by different users or user groups in large parallel systems, where both user-level fairness and system-wide efficiency are of important concerns. To achieve fairness, we use the well-known equi-partitioning algorithm to distribute the available processors among the active job sets at any time. For efficiency, we apply a feedback-driven adaptive scheduler that periodically adjusts the processor allocations within each set by consciously exploiting the jobs’ execution history. We show that our algorithm achieves asymptotically competitive performance with respect to the set response time, which incorporates two widely used performance metrics, namely, total response time and makespan, as special cases. Both theoretical analysis and simulation results demonstrate that our algorithm improves upon an existing scheduler that provides only fairness but lacks efficiency. Furthermore, we provide a generalized framework for analyzing a family of scheduling algorithms based on feedback-driven policies with provable efficiency. Finally, we consider an extended multi-level hierarchical scheduling model and present a fair and efficient solution that effectively reduces the problem to the two-level model.