钢铁成分及添加元素对热镀锌组织和性能的影响

介绍了钢中元素(C、Si、P、Cu和Ti)对热镀锌组织和性能的影响。结果表明:通过向锌液中添加Al、Mg、Ni和微量稀土,合金的晶粒得到明显细化,组织得到改善,而且更加致密均匀,镀层厚度得到一定的减薄,从而提高了合金镀层的耐蚀性。     

融合面积估算和多目标优化的硬件任务划分算法

针对可重构计算机系统配置次数(划分块数)的最小化问题,提出了一种融合面积估算和多目标优化的硬件任务划分算法。该算法每次划分均进行硬件资源面积的估算,并且通过充分考虑可重构资源的使用、一个数据流图所有划分块执行延迟总和、划分模块间边数等因素构造了新的探测函数prior_assigned(),该函数能够计算每个就绪节点的优先权值,新算法通过该值能动态调整就绪列表任务节点的调度次序。实验结果表明,与现有的层划分、簇划分、增强静态列表、多目标时域划分、簇层次敏感等5种划分算法相比,该算法能获得最少的模块数,并且随着可重构处理单元面积的增大,除层划分算法之外,其执行延迟的均值也是最小的。     

基于软件执行轨迹差异比对的关键函数定位技术研究

关键函数是指应用软件在某个运行阶段发挥着关键作用的核心功能函数。对软件中的关键函数进行快速定位是提高逆向分析效率的有效手段。目前,在软件逆向工程领域对关键函数进行定位大多是利用人工分析的方法。利用动态二进制插桩技术,提出了一种切实可行的基于软件执行轨迹差异的关键函数自动定位方法。当软件具有2类不同的输入,分别触发、不触发关键函数时,该方法能够快速、准确地识别关键函数。     

Synthesis of a novel chelating resin functionalized with β‐dicarbonyl units from a new monomer and its use for selective separation and preconcentration of some trace metals in water samples

A new chelating resin, poly(4‐ethoxy‐2,4‐dioxobutyl 2‐methylacrylate), functionalized with β‐dicarbonyl units derived from a newly synthesized monomer was prepared and characterized with molecular spectroscopic methods. The synthesized polymer was used for the separation and preconcentration of Mn(II), Co(II), Ni(II), Zn(II), and Pb(II) ions before their determination by flame atomic absorption spectrometry. The effects of different parameters, such as pH of sample solution, sample and eluent flow rates, volumes of sample and eluent, concentration and type of eluent, and matrix ions on quantitative recovery of the analytes were evaluated for optimal experimental conditions. The adsorption capacities of the chelating resin for cobalt(II) and nickel(II) were found to be 24.2 and 19.8 mg g^?1, respectively. Validation studies for the proposed method were performed using three certified reference materials, and the results obtained were agreed with those of the certified values. The proposed method was successfully applied to the analysis of water samples. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013     

在线分析仪表在煤气化装置中的应用及其预处理系统的改造

煤气化装置洗涤塔合成气分析采用在线色谱分析仪、红外分析仪和微量氧分析仪,烧嘴冷却水分离器放空线采用红外分析仪检测CO含量,针对原预处理系统存在的问题进行技术改造,并介绍仪表维护中的故障分析和处理过程。     

Airborne Polycyclic Aromatic Hydrocarbons (PAH) in Bangkok Urban Air: Part II. Level and Distribution

The gas-particle partitioning and particle size distributions of airborne PAH in Bangkok urban air were investigated using an 8 stage size fractionating cascade impactor (Andersen “low volume” sampler) and a downstream XAD-2 adsorbent tube for sample collection. Nine PAH classified as carcinogenic and co-carcinogenic compounds-Pyrene (PYR), Benz(a)Anthracene (BaA), Benzo(e)Pyrene (BeP), Dibenz(a,c)Anthracene (DBacA), Benzo(k)Fluoranthene (BkF), Benzo(a)Pyrene (BaP), Dibenz(a,h)Anthracene (DBahA), Benzo(ghi)Perylene (BghiP) and Trimethylcholanthrene (3MC) - were quantified. The lower molecular weight (MW) PAH such as PYR, BeP and BaA were present mainly in the gaseous phase (80%, 40% and 24%, respectively) while higher MW compounds were present almost totally in the particulate fraction. The results show that 30%–60% of each PAH by mass were found on particles smaller than 0.43 μm and more than 70% on particles with diameter less than 2.1 μm. In addition, the relationship between the particle/gas partition coefficient (K _p ) and the sub-cooled liquid vapor pressure (p°_L) was also determined to describe the gas-particle partitioning of those PAH compounds in a tropical atmosphere.     

电感耦合等离子体原子发射光谱法测定水中7种微量元素

利用电感耦合等离子体原子发射光谱法测定了矿泉水及饮用水中的铝、铬、锰、汞、镉、铅、镁等7种元素的含量。结果表明:标准曲线的线性关系良好,检出限为0.000 9⁰.075 9μg/mL,精密度为0.530.075 9μg/mL,精密度为0.53².42,加标回收率在101.2%2.42,加标回收率在101.2%¹06.5%之间。     

痕量铀分析样品的预处理方法

后处理厂运行过程中的痕量铀样品分析受到H+和NO-3干扰,严重影响其分析速度与准确度。本工作针对时间分辨荧光法分析痕量铀样品的主要干扰H+和NO-3,使用离子交换纤维建立了纤维浸泡式样品预处理方法。该方法有效消除H+和NO-3对铀酰荧光分析的干扰,处理后的样品可以使用工作曲线法测量,操作简便、准确度高,适合于手套箱中使用,满足了后处理厂痕量铀样品预处理方法急需改进的需求。经模拟样品分析6次测量精密度优于5%,测量结果经t检验(α=0.02)证明结果准确可靠。     

煤中某些伴生金属元素的综合利用指标探讨

随着煤炭综合开发利用的增加,急需确定煤中大部分伴生元素综合回收利用的品位和边界品位,以便在煤炭勘探阶段采取综合评价措施,降低勘探成本。参照《矿产工业要求参考手册》中各类元素的工业品位和边界品位,世界煤中微量元素平均含量,以及根据国家各项技术经济政策和市场要求,综合考虑给出原煤中部分伴生微量元素综合回收利用指标,建议锂、铀、钍和稀土的综合回收利用指标分别应该为120,40,150和300 mg/kg。