鲁棒性项目调度中缓冲设置方法

研究应对不确定因素的鲁棒性项目调度, 针对其所用时间缓冲区技术中的两种重要方法——集中缓冲和STC (starting time criticality) 分散缓冲, 采用仿真模拟实验, 以项目管理库中的帕特森例1 为对象, 进行详细的比较研究. 研究结果表明, 分散缓冲法具有更好的解鲁棒性; 当活动时间的不确定性程度较大时, 集中缓冲法的质量鲁棒性较好; 当项目工期较紧时, 分散缓冲法具有更好的鲁棒性. 这些研究结论为管理者在特定的项目环境下选择合适的缓冲方法提供了决策依据.     

2,3-环氧丙磺酸钠的合成及应用进展

综述了3 氯 2 羟基丙磺酸钠和2,3 环氧丙磺酸钠的合成及其在功能材料方面的应用。由环氧氯丙烷与亚硫酸氢钠反应可以生成3 氯 2 羟基丙磺酸钠,再由3 氯 2 羟基丙磺酸钠在碱性溶液中闭环生成2,3 环氧丙磺酸钠。2,3 环氧丙磺酸钠因其分子结构中既含有环氧基,又含有亲水性的磺酸盐基团,可通过环氧基的开环反应和共聚反应等制备许多性能优异的功能物质如:胶凝化剂、稠化剂、乳化剂、光敏材料、印染保护剂等。     

在二辛基磷酸钠的微乳液中金属盐的最大含量

测算了二(2-乙基己基)磷酸钠(NaDEHP)或二(正辛基)磷酸钠(NaDOP)、正辛醇，正辛烷、水和金属盐(CoSO4、NiSO4、FeCl2、CuCl2和CaCl2等)组成的均匀单相微乳液中金属盐水溶液的极限增溶量(Vlim)和金属盐的最大含量(Smax)。相同条件下，NaDOP体系中的Vlim和Smax都比NaDEHP体系巾的高得多，这是因为NaDOP中的正辛基的空间位阻小。     

Groundwater as a source and pathway for road salt contamination of surface water in the Lake Ontario Basin: A review

In Ontario, there is limited comprehensive research regarding the contribution of chloride in groundwater to surface water systems. The delivery of chloride via groundwater can contribute to the degradation of the Great Lakes and their tributaries. Thus, this review intends to fill or identify knowledge gaps regarding assessing groundwater as a potential source of road salt, the single largest use of salt in urban cold region environments, contamination to surface water by synthesizing existing groundwater chloride research in the Lake Ontario Basin. Knowledge regarding source characterization, properties, pathways, and impacts of chloride in the environment is essential to evaluate the contribution of chloride via groundwater. Past groundwater chloride research in the basin is primarily concentrated in highly urbanized areas and has identified localized trends of increasing groundwater chloride concentrations in these regions; however, few investigations have been conducted in varying land uses (e.g., rural or less urbanized watersheds) or at sufficient temporal and/or spatial scales. Significant chloride accumulation is occurring in watersheds and aquifers within the basin. Concentrations are expected to increase until equilibrium is obtained, thus resulting in sustained yearlong elevated concentrations in tributaries. Recently, chloride loading to Lake Ontario has increased significantly, with groundwater inputs having the potential to support long-term increases in chloride concentrations in the lake. However, few studies have evaluated the explicit contribution via groundwater to Lake Ontario, and therefore a knowledge gap continues to exist. We provide a synthesis of additional research priorities to better understand the magnitude of groundwater chloride issues in the basin.     

分子内敏化鎓盐的合成及光敏性研究

二芳基碘鎓盐和三芳基硫鎓盐是阳离子聚合的光引发剂和光敏产酸物,但他们在300nm以上的光吸收很低,限制了对紫外光的利用效率。为解决此问题,本文合成了一些新的碘鎓盐和硫鎓盐,并用凝胶时间方法考察了它们的光引发效率。实验结果表明,2-苯硫基甲基,2′,4′-二甲基二苯碘鎓盐和9-蒽丙基,二苯基硫鎓盐具有特别高的光引发效率,这归之于光照时这些鎓盐发生了分子内电荷转移反应,即发生了分子内敏化。9-蒽丙基二苯硫鎓盐分子中的蒽基(An)是电子给体也是敏化基团,光照时可发生如下反应:     

气相色谱-质谱联用法测定金属皂中的多环芳烃

建立了金属皂中16种美国环保局(EPA)优先监控的多环芳烃的气相色谱-质谱(GC/MS)联用测定方法,样品先用二甲基亚砜萃取,再用环己烷进行反萃取,经硅胶柱净化后,用GC/MS分离测定。优化了16种多环芳烃(PAHs)的分离测定条件,结果16种PAHs的平均回收率为75.32%￣98.72%,精密度实验相对标准偏差(RSD)为2.19%￣6.93%,检测限(S/N=5)为0.002￣0.010mg/kg。该方法灵敏度高、准确性好,完全可以满足金属皂中多环芳烃的检测要求。     

原盐洗涤工艺在精盐水制备中的应用

针对当前原盐中因Mg^2 、Ca^2 及泥沙含量较大而严重影响生产的实际情况，介绍了1种简单易行的原盐洗涤工艺。     

谈如何提高二次精制盐水质量

介绍了锦化化工(集团)有限责任公司提高二次精制盐水质量的成功经验,讨论了过滤系统中碳素烧结管间距、一次盐水的质量及其游离氯含量、人为操作失误和助体给料量等五大因素对二次精制盐水质量的影响,并采取了相应的措施,如调整合适的碳素烧结管间距、改走砂滤器、更换过滤器碳素管等。介绍了二次精制盐水精制系统树脂塔精制盐水的操作要素,诸如控制盐水流量最高为68m3/h、温度在(60±5)℃、pH值在9左右,控制树脂塔的压差、树脂填充量、树脂性能、仪表阀的检查情况等,从而生产出高质量的二次精制盐水,保证了离子膜电解槽的平稳、高效运行。     

2-羟基-3-烯丙氧基丙磺酸钠的合成

采用新方法合成了2-羟基-3-烯丙氧基丙磺酸钠。先由环氧氯丙烷和亚硫酸氢钠合成中间体3-氯-2-羟基丙磺酸钠，然后中间体再与丙烯醇在氢氧化钠催化下生成目标产物2-羟基-3-烯丙氧基丙磺酸钠。2步反应总收率在70％左右，中间体和产物分别进行了光谱表征。     

Electrochemical formation of AlN in molten LiCl-KCl-Li3N systems

Electrochemical formation of aluminum nitride was investigated in molten LiCl-KCl-Li₃N systems at 723 K. When Al was anodically polarized at 1.0 V (versus Li⁺/Li), oxidation of nitride ions proceeded to form adsorbed nitrogen atoms, which reacted with the surface to form AlN film. The obtained nitrided film had a thickness of sub-micron order. The obtained nitrided layer consisted of two regions; the outer layer involving AlN and aluminum oxynitride and the inner layer involving metallic Al and AlN. When Al electrode was anodically polarized at 2.0 V, anodic dissolution of Al electrode occurred to give aluminum ions, which reacted with nitride ions in the melt to produce AlN particles (1-5 μm of diameter) of wurtzite structure.