Diagnostic test decision for suppliers in cruise-building supply chain with information asymmetry

To solve the potential supply disruption in cruise-building supply chain, this study explores a supply system consisting of a monopoly supplier, a new entrant supplier, and a cruise-building manufacturer. A two-step option contract including diagnostic test and process improvement is designed to solve the order quantity allocation and to avoid supply disruption. The analysis combines the decision tree with the principal-agent model under information asymmetry. The result shows that the cruise-building manufacturer would like to allocate more orders to the unreliable supplier who implements process improvement. In the end, the detailed numerical analysis is implemented to justify the proposal.     

狂犬病病毒核衣壳抗原诊断试剂盒实验室内的质控方法

目的探讨狂犬病病毒核衣壳抗原诊断试剂盒实验室内质控方法。方法以ELISA双抗体夹心法检测狂犬病病毒抗原为例,采用“Levey-Jennings”和“即刻法”质控法进行对比。结果“Levey-Jennings”质控图中所有测定结果均处于“在控状态”,而“即刻法”质控图中一次测定结果处于“失控状态”。结论宜采用双质控方法进行狂犬病病毒核衣壳抗原诊断试剂盒实验室内质控。     

谈10kV配网高压断路器机械故障诊断技术

本文就10kV配网高压断路器机械故障诊断技术要点进行分析探讨,并提出相应解决措施.     

高光谱数据挖掘在蚀变矿物识别与提取中的应用

略叙了当前国内外高光谱遥感技术在矿物识别中的应用现状,基于岩石矿物晶体场理论、离子与矿物的光谱识别规则,采用诊断性吸收特征谱带、空间数据挖掘理论、遥感信息建模等技术开展蚀变矿勃识别与提取研究。针对具体的操作步骤建立了相关流程图,为以后的岩矿遥感提取工作建立了初步理论依据。     

Dominant frequency of pressure drop signal as a novel diagnostic tool for the water removal in proton exchange membrane fuel cell flow channel

In this work, a transparent assembly was self-designed and manufactured to perform ex situ experimental study on the liquid water removal characteristics in PEM fuel cell parallel flow channels. It was found that the dominant frequency of the pressure drop across the flow channels may be utilized as an effective diagnostic tool for water removal. Peaks higher than 1 Hz in dominant frequency profile indicated water droplet removals at the outlet, whereas relatively lower peaks (between 0.3 and 0.8 Hz) corresponded to water stream removals. The pressure drop signal, although correlated with the water removal at the outlet, was readily influenced by the two phase flow transport in channel, particularly at high air flow rates. The real-time visualization images were presented to show a typical water droplet removal process. The findings suggest that dominant frequency of pressure drop signal may substitute pressure drop as a more effective and reliable diagnostic tool for water removal in PEM fuel cell flow channels.     

电压频率转换器在诊断X射线检测中的应用

根据诊断X射线检测的设计要求,结合STM32单片机的特点,将电压频率转换器应用到诊断X射线检测系统中。分析了电压频率转换器的工作原理,给出了电压频率转换器电路设计及诊断X射线检测系统的硬件构成,并对检测系统的控制程序流程进行详细的说明。电压频率转换器具有设计简单、低成本、高精度、应用灵活等特点,适合于低速数据采集。     

抗霍乱弧菌O1群单克隆抗体的制备及初步鉴定

目的制备抗霍乱弧菌O1群特异性单克隆抗体(McAb),并进行鉴定。方法以福尔马林灭活的O1群霍乱弧菌免疫BALB/c小鼠,应用细胞融合技术建立分泌抗O1群霍乱弧菌McAb的杂交瘤细胞株。对配对较好的6个细胞株分泌的McAb进行腹水效价、免疫球蛋白类及亚类、抗体亲和常数测定及凝集试验和稳定性试验。与细菌培养法对比检测208份临床标本。结果6个细胞株分泌的McAb腹水效价均为105,均为IgM;抗体亲和常数为1.84×105～5.38×107;且均与O1群霍乱弧菌菌株发生凝集反应,与霍乱弧菌O139群、大肠杆菌、出血性大肠杆菌O157∶H7、副溶血弧菌、麦弧菌、河弧菌、结肠炎耶尔森菌、普通变形杆菌、痢疾杆菌、伤寒杆菌及各型副伤寒杆菌均不发生凝集反应。6个分泌McAb的细胞株连续培养15周,经液氮冻存12个月后复苏,仍能稳定分泌抗体;与细菌培养法对比检测208份临床标本,特异性和灵敏度均达100%。结论制备的McAb具有较高的特异性,有可能用于开发霍乱弧菌O1群的检测试剂。     

18F-FDGPETCT显像在难确诊性鼻咽癌中的临床价值

目的:探讨18F-FDGPETCT显像在难确诊性鼻咽癌中的临床应用价值.方法:回顾性分析2020年3月-2021年2月我院临床高度怀疑鼻咽癌的60例患者,首次或多次行鼻咽镜病理活检阴性,行常规18F-FDGPET/CT检查,根据PET/CT结果引导再次行鼻咽镜病理活检.将上述患者分为两组,以最终病理结果为金标准,分为阳...     

基于神经网络的质量控制图异常诊断

针对质量控制图异常模式到异常原因的映射存在模糊不确定性,采用4层前馈BP神经网络,实现从控制图异常模式到异常原因的推理诊断,构建质量控制图异常模式异因推理诊断系统。首先,将控制图异常模式进行归类,构建控制图异常模式集;其次,针对每种异常模式,确定与之对应的异常原因集;最后,针对每一种异常模式,利用其模式数据作为输入,与之对应的异常原因的异常度作为输出,构建与其对应的神经网络,实现质量控制图异常模式到异常原因的推理诊断,并在此基础上将神经网络输出异常度按大小进行排序,缩小异常原因查找范围,提高查找效率。