浅议美国文化与自然遗产保护

通过对美国自然与文化遗产保护发展历程的评述,揭示美国人在对待遗产问题上思想观念的形成和发展、管理手段逐渐完善的过程,并通过典型实例的探讨和分析,为今后保护和利用我国丰富的历史遗产提供参考.     

构建基于网络的VB教学平台

通过对课程教学改革探索与实践,构建基于网络的辅助教学平台,这种教学方式是对传统教学模式的补充和发展.     

Progressive filling partitioning and mapping algorithm for Spark based on allocation fitness degree

The job execution mechanism of Spark was analyzed,task efficiency model and Shuffle model were established,then allocation fitness degree (AFD) was defined and the optimization goal was put forward.On the basis of the model definition,the progressive filling partitioning and mapping algorithm (PFPM) was proposed.PFPM established the data distribution scheme adapting Reducers’ computing ability to decrease synchronous latency during Shuffle process and increase cluster the computing efficiency.The experiments demonstrate that PFPM could improve the rationality of workload distribution in Shuffle and optimize the execution efficiency of Spark.     

木丝水泥板作为免拆模板的施工方法初步研究

木丝水泥板是一种绿色环保的节能材料.文章对木丝水泥板作为免拆模板的建筑施工方法进行了研究,并据此成功实施了试点工程,验证了木丝水泥板作为免拆模板应用的可行性,对施工要点进行了总结,为编制相关施工工法和应用技术规程积累了经验.     

电火花强化工艺制造金刚石镀层实验研究

为实现金刚石工具的快速制造和在线快速修复,探索了一种简单快速的金刚石表面强化工艺方法的可行性。以金刚石颗粒和钴颗粒为主要成分,采用压制工艺制作电极,并用该电极在基体材料304不锈钢板上进行电火花强化实验,探究电极的压制压力、金刚石含量、加工电流和加工时间等参数对实验效果的影响规律。用镀钛金刚石电极加工5 min,可得到表面上金刚石颗粒的表面积分数为13.5%、厚度为400μm的强化层,且该强化层具有很好的磨削性能。     

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.     

1000 MW机组锅炉汽动引风机运行试验分析

为节约厂用电、减少设备维护成本、简化引风机的DCS控制方式,对某1000 MW机组进行了引风机与脱硫增压风机合并后采用小汽轮机驱动引风机的改造。在汽动引风机调试过程中进行汽动引风机并入运行、最大出力试验,并对启动过程中的风机抢风现象给出了操作建议。     

Fe_2O_3含量对MnZn铁氧体中Fe~(2+)量、磁性能及导电机制的影响

通过测量MnZn铁氧体的磁性能及Fe2+、Mn3+含量,考察了MnZn铁氧体中的Fe2+含量与配方中Fe2O3、MnO含量的关系及其对MnZn铁氧体磁性能的影响,并探究了MnZn铁氧体的导电机制。结果表明:随着(Fe2O3)a(MnO)b(ZnO)c主组成配方中a值递增(52.55≤a≤53.35)、b值递减(38.33≥b≥37.52),呈现出Fe2+、Mn3+含量均增加的趋势。随着Fe2+含量增加,Pcv谷底温度向低温方向移动,Pcv(min)先减后增,Pcv(20/70/100℃)均先减后增,均在Fe2+含量=1.55%附近达到最小值;起始磁导率μi(20/70/100℃)均先增后减。根据Pcv-Fe2+含量和μi-Fe2+含量两个关系图在Fe2O3=53.15mol%附近出现极值点这一现象,初步推测铁氧体Znα2+Mnβ-x2+Mnx3+Fey2+Feχ-y3+O4+σ(0.1794≥α≥0.1786,0.754≥β≥0.734,0.0031≤x≤0.0040,0.051≤y≤0.070)的导电机制为:y0.064时小极化子间的束缚能主导,y0.064时电子跃迁主导。     

从工艺矿物学角度探讨某些难处理资源开发利用中的问题

探讨铜镍硫化矿矿石、钼矿石、大洋锰结核、脉石矿物中含弥散状磁铁矿矿石、含磁性硅酸盐矿物的赤铁矿矿石及某些含放射性矿物矿石等的开发利用过程中应注意的问题,并总结了影响矿石选矿的工艺矿物学因素。这样的总结可与自动工艺矿物学参数测试系统结合,形成资源可利用性评价的智能系统。