Surface Characteristics of Sorptive-Filtration Storm Water Media. II: Higher Specific Gravity (ρs > 1.0) Oxide-Coated Fixed Media

Most current control strategies for storm water treatment utilize fixed or filter-bed media with specific gravity (ρs) greater than 1.0. In contrast to Part I, Part II focuses on such higher density (ρs > 1.0) manganese-oxide-coated media that can be used in combined unit operations and processes for in-situ treatment of storm water. Methods were developed to coat manganese oxides onto sand and cementitious media for storm water treatment. With respect to manganese, coatings of ramsdellite produced a point of zero charge (PZC) of 5.2, while mixtures of birnessite and cryptomelane produced a PZC of 2.6 Manganese oxide increased the specific surface area (SSA) of sand and cementitious media. Manganese-oxide-coated sand (MOCS) produced a larger SSA (2.48-m2∕g), as compared with birnessite-coated media (BCM) (1.51 m2∕g), while the two have a similar surface charge (PZC = 6.4). Manganese-oxide-coated cementitious media (MOCM) produced a significantly larger SSA (19.49 m2∕g), as compared with coated sand, and SEM analyses indicated the surface contained manganese oxide and calcite of thickness 10–30 μm. Based on the results, coated cementitious media provided surface characteristics that can significantly enhance filtration and adsorption of heavy metal in storm water, in comparison to sand.     

基于高海拔地区的大气中子单粒子效应实时测量试验研究

开展65 nm高速大容量静态随机存取存储器（SRAM）大气中子单粒子效应特性及试验评价技术研究,基于4 300 m高海拔地区大面积器件阵列实时测量试验,突破效应甄别、智能远程测控等关键技术,在153 d的试验时间内共观测到错误43次,其中器件内单粒子翻转39次,多单元翻转（MCU）在单粒子翻转中占比23%,最大的MCU为9位。对高能中子、热中子和封装α粒子的贡献比例进行了分析,并基于多地中子通量数据,推演得到北京地面和10 km高空应用时的单位翻转（SBU）和MCU失效率（FIT）。发现地面处软错误的主要诱因为封装α粒子,随着海拔的增高,大气中子对软错误的贡献比例明显增大;MCU全部由高能中子引起,北京10 km高空处的MCU FIT值明显增大,其占比由地面的8%增大至26%。结合器件版图布局,对MCU产生机理进行了深入分析。最后,提出一种目标导向的存储器软错误加固策略优化方法。     

2号高炉进风面积的调节

叙述了武钢2号高炉针对原燃料条件变化进行进风面积的调整及调整效果，并对其原因进行了分析。     

汽车空气流量传感技术现状与发展趋势

电喷系统是汽车的核心控制系统,它以空气流量传感器测量获得的进气量为依据确定喷油量与点火时间,从而使得燃料燃烧在理论空燃比附近,以实现更好的安全性、经济性、动力性以及更低的废气排放。因此,进气量的精确测量对汽车电喷系统具有非常重要的意义。介绍了汽车电喷系统空气流量传感技术的现状、存在的问题及发展趋势,并提出了一种采用平行平板电容原理结合涡街原理的传感方式。     

Numerical examination of wave power absorption by the Edinburgh Duck wave energy converter device

A two-dimensional computational fluid dynamics(CFD)numerical model is developed to study the power takeoff(PTO)efficiency of an Edinburgh duck wave energy conve...     

222Rn在大气输运研究中的示踪应用

本文简要回顾了222Rn及其子体示踪应用的主要方面,介绍了国内外对利用222Rn及其子体在预报地震和大气物质输运研究这两方面的工作.对这些示踪应用而言,要进行准确的定量分析和数值模拟,必须对222Rn及其子体在大气中的输运规律有细致的了解,这一点可以通过研究其动力学特征,建立输运模型来实现.本文中列举了部分对222Rn及其子体输运模式的研究,对比上层大气中的简单输运模型,一个比较全面的222Rn输运模型还需要考虑地表层结大气中的复杂的动力学因素,并将其作为222Rn在上层大气输运模型中的下垫面边界条件.     

蛋白A免疫吸附治疗高群体反应性抗体肾移植受者的研究

目的探讨葡萄球菌蛋白A免疫吸附治疗高群体反应性抗体肾移植受者的临床疗效。方法采用蛋白A免疫吸附柱对5例高群体反应性抗体(PRA)肾移植受者进行免疫吸附治疗,共治疗21次,治疗后择期进行肾移植。结果4例患者肾移植前伴有高水平PRA的患者,蛋白A免疫吸附治疗后血清PRA和IgG、IgM水平明显下降,肾移植术后未发生急性或超急性排异反应;1例伴有高水平PRA、肾移植术后发生急性排异反应的患者,蛋白A免疫吸附治疗后血清PRA和免疫球蛋白水平明显下降,急性排异反应迅速缓解。结论蛋白A免疫吸附能有效降低患者血清群体反应性抗体水平,防治肾移植术后排斥反应。     

Mesoporous Co3O4 for low temperature CO oxidation: effect of calcination temperatures on their catalytic performance

Mesoporous Co3O4 particles are prepared by using mesoporous silica KIT-6 (with double gyroid Ia-3d symmetry) as a hard-template and Co(No3)2 x 6H2O as an inorganic precursor. In the former section, we investigate the effect of the calcination temperatures at which the Co salts are converted into Co3O4 inside the mesopores on the textural parameters of the products. The results of N2 adsorption-desorption analysis indicates that the calcination temperatures do not obviously affect the textural parameters such as the surface areas and pore volumes. However, when the calcination temperature reaches 800 degrees C, the mesostructural ordering is dramatically decreased, resulting in the reduction of the surface areas and pore volumes. After 800 degrees C calcination, the formation of large Co3O4 grains is partially confirmed on the particle surface by SEM observation. The grain size is much larger than the mesopore size of the original KIT-6, meaning the crystal growth is continuously occurred by breaking the rigid silica frameworks. In the latter section, we discuss the effect of the calcination temperatures and textural parameters on the catalytic activity for CO oxidation by both steady state and kinetic measurements. All mesoporous Co3O4 particles show a high catalytic activity, for example, -72 degrees C for sample calcined at 450 degrees C. Only 10 degrees C difference in T50 (the temperature of 50% conversion of CO) is found between the samples with the highest and lowest catalytic activity. The values of activation energy (Ea) and pre-exponential factor (A) per unit area are almost the same between two samples calcined at 450 degrees C and 800 degrees C. It is demonstrated that calcination process can not alter the essential catalytic property of mesoporous Co3O4 particles.     

基于服务蓝图的网上零售业感知服务质量

通过绘制网上零售业的服务蓝图和相关的企业调研识别了所涉及到的服务接触点,以此为基础概括出网上零售业中的服务接触因素,并运用模糊综合评价方法对网上零售业的顾客感知服务质量进行测评,分析网上零售业中的失败服务接触点,目的在于通过改进失败的服务接触点,提高网上零售业的顾客体验。通过测评,顾客对网上零售业的物流配送和在线服务感知一般。     

噪声数据压缩器检测平台的PCM解码实现

为了提高数据的精度,便于收发端进行数据加工和处理、适应数字技术和大规模集成技术的飞速发展,研究了脉冲编码调制方式PCM（Pulse Code Modulation）。主要对噪声数据压缩器实时下传的PCM码进行解码,通过上位机读出数据进行测试,完成对系统进行功能验证。重点在硬件的功能实现上对其进行阐述,通过试验准确地接收到数据,实现PCM码流解码,从而证明本设计方案切实可行。