龙滩水电站500 kV高压设备耐压试验简介

介绍了龙滩水电站500kV高压设备试验过程，并结合试验中需注意的问题提出了建议，供同行在今后类似试验时参考。     

低成本钢尾渣-矿渣基矿山充填料的优化开发

 为实现多固废协同利用、降低充填成本,在矿渣基全粒级细尾砂胶结充填料基础上,以流动性和抗压强度为表征,利用热闷钢渣磁选尾渣(钢尾渣)替代部分矿渣作为胶凝材料,脱硫灰和水泥熟料替代部分专用添加剂作为外加剂,采用正交试验探寻掺量规律,优化固体填充料配比,开发钢尾渣-矿渣基软性矿山充填料,并研究了外加剂与胶材比、灰砂比等因素的影响。对比分析了矿渣基准组、钢尾渣-矿渣基准组(B1)、强度最优外加剂组分钢尾渣-矿渣组(B7)等3组充填料的微观形貌及XRD图谱以探究其水化机理。结果表明,钢尾渣替代矿渣量增加、外加剂与胶材比减小,充填料浆流动性改善,但充填体抗压强度下降。强度正交试验结果表明,钢尾渣掺量大小决定强度低高,脱硫灰掺量宜高于水泥熟料。进一步调整外加剂组分配比,在灰砂比为1∶6、钢尾渣替代矿渣为20%条件下,找出B7组外加剂组分为脱硫灰、水泥熟料分别替代30%、20%专用添加剂,B7组料浆扩展度为143 mm,充填体形貌为富铁绿泥石胶结假方体钙硅灰石,28 d抗压强度达2.13 MPa,较基准组低0.19 MPa,较B1提高0.26 MPa。该替代方案满足现场充填C2级强度的要求,改善流动性并显著降低了充填成本。优化的外加剂组分配比在灰砂比为1∶4条件下同样具有强度优化作用,但较灰砂比为1∶6条件下低。     

核壳乳剂的潜影分布和Sabatier效应的研究

本文制备了两种单分散八面体模型孔剂,一种是含碘10mol％的碘均匀分布碘溴化银乳剂,另一种是内核含碘20mol％的碘溴化银,外壳为溴化银的核壳乳剂。并对它们分别进行表面硫加金和硫加金加铱敏化。用简单腐蚀技术研究上述乳剂的内部影像空间分布的结果表明:随着表面敏化程度的增加,表面敏度逐渐增大;随着腐蚀的深入,内部敏度逐渐减少。核壳乳剂的表面和内部敏度均大于碘均匀分布颗粒乳剂。核壳乳剂的内部影像在颗粒內部先逐渐减少,在一定深度以后又逐渐上升,内部影像分布出现“低谷”,且“低谷”程度与表面敏化程度有关。Sabatier效应研究的结果表明:产生较明显的Sabatier效应的乳剂颗粒既要有足够的表面敏度,也要有足够的内部敏度,且两者要匹配。同时提出了产生Sabatier效应的机理。     

滚齿加工中最大齿根圆角半径的简化计算

为快速验证所设计齿轮加工工艺性,本文提出了一种简化设计滚齿刀轴向剖面尺寸及一种简化计算滚齿刀所能加工齿轮最大齿根圆角的新方法。通过实践验证,本方法具有准确、实用和高效的优点,对齿轮优化设计具有一定指导意义。     

KNO3/Al2O3催化环戊二烯甲基化反应

研究了固体碱KNO3/Al2O3(KNA)催化合成甲基环戊二烯的反应性能,考察了KNO3负载量、反应温度、反应时间以及酸碱性位中毒等因素对环戊二烯甲基化反应的影响。结果表明,KNO3负载量为质量分数26%时样品的催化活性最高,450℃时能催化转化33%的环戊二烯,甲基环戊二烯的选择性达到86%。催化剂通过原位氧气焙烧除去积炭即可恢复活性。     

Preparation of Ca- Fe oxygen carrier using metallurgical dust

Chemical chain combustion technology is a new combustion technology that achieves efficient and low energy separation for CO2 capture. CaSO4- Fe2O3 oxygen carrier was prepared by sol- gel method from blast furnace slag containing iron, and X- ray diffraction (XRD) and scanning electron microscopy and energy dispersive X- ray (SEM- EDX) were used to characterize the oxygen carrier particles. The results show that the CaSO4- Fe2O3 oxygen carrier prepared from iron metallurgical dust has a mass fraction of 93. 58%, a specific surface area of 10. 37cm2/g and a conversion rate of 67. 47% after reaction?? with coal powder, which has good reactivity. Combined with SEM and EDS analysis, the main cause of the decrease of carrier activity is the accumulation of coal ash during the cycle combustion process, resulting in complex and diversified carrier components, chemical reactions and agglomeration effects, and then carrier activity is reduced.     

DEVELOPMENT OF A CHEMILUMINESCENT ELISA FOR DETERMINING OKADAIC ACID IN SHELLFISH

ABSTRACT

An indirect competitive enzyme‐linked immunosorbent assay with chemiluminescent (CL‐ELISA) detection for okadaic acid (OA) in mussel muscle was developed. A hybridoma cell line secreting monoclonal antibody against OA was established after immunization of BALB/c mice with artificially synthesized OA‐bovine serum albumin as antigen. Luminol solution was used as the substrate for horseradish peroxidase. The detection limit was 0.175 ng/g. The range of average fortified recovery was 91.8–102.6% when OA was spiked in mussel muscle at levels of 50, 160 and 800 µg/kg. The standard curve for OA showed good linearity over the concentration range of 0.08125–20 ng/mL. The cross‐reactivity with dinophysistoxin1 and saxitoxin was 51.82 and 0%, respectively. In a residue study, the results obtained by CL‐ELISA correlated well within those obtained using the commercial ABRAXIS kit (ABRAXIS, Warminster, PA). The developed method is therefore suitable for detecting the residues of OA in shellfish.

PRACTICAL APPLICATIONS

Diarrhetic shellfish poisoning is a gastrointestinal syndrome that occurs in humans following the consumption of bivalve mollusks contaminated with OA with the main symptoms of diarrhea, nausea, vomiting and abdominal pain. OA widely exists at marine products and it is very important to develop a technique to monitor this toxin. In this study, a sensitive competitive indirect enzyme‐linked immunosorbent assay with chemiluminescence for determination of OA in mussel soft tissues was investigated. Chemiluminescent ELISA (CL‐ELISA) is a good alternative method for screening samples. This technique has the potential to improve the sensitivity of the immunoassays by at least two to three orders of magnitude compared with conventional colorimetric detection.