气候环境实验室的温度校准及不确定度评定

目的解决气候环境实验室超大空间温度性能的校准问题。方法通过对实验室结构及气流组织进行分析,确定实验室有效空间内温度不均匀性及波动度概率较大位置,设计实验室温度校准方案。通过数据采集系统,对实验室温度数据进行采集,并对温度校准的不确定来源进行分析,评定气候环境实验室温度性能及扩展不确定度。结果以低温工况-50℃及高温工况50℃数据分析为例,气候环境实验室在低温-50℃时,室内温度平均值处于-48.67^-50.27℃范围内的可信度是95%;在50℃时,室内温度平均值处于48.57~50.77℃范围内的可信度是95%。结论气候环境实验室温度性能校准方法可实现对超大空间实验室温度性能的校准,并验证了气候环境实验室温度的均匀性及波动度等技术指标满足其设计要求。     

用ICS-90型离子色谱仪测定水中钙离子的不确定度分析

对离子色谱法测定水中钙离子的不确定度进行评定,并分析了其影响因素主要有来自重复测量引入的A类不确定度和来自工作曲线的不确定度以及来自标准溶液的不确定度。     

等离子发射光谱-质谱(ICP-MS)直接用于饮用水中的砷、锑、硒测定研究

用等离子发射光谱和等离子发射光谱-质谱作比较,等离子发射光谱-质谱用于饮用水As、Sb、Se的测量时需考虑校正系数,通过不确定度分析,确定了ICP-MS测定方法不确定度大小,得出结论:不要氢化物发生器,不加EDTA作为掩蔽剂,也可以直接用于实际.     

地面装备红外辐射测量不确定度分析研究

目的 分析评价复杂背景环境下地面装备红外辐射成像特性的测量精度.方法 基于红外辐射成像测量与定标原理,全面分析复杂环境下地面目标动态红外辐射成像测量中由设备性能、环境干扰、操作参数设置及相对运动等所引入的8项误差因素.采用校准黑体与被测目标等距离同视场同步标定测量方法,基于试验方法评定各测量不确定度因子,构建地面装备红...     

COVID-19 and individual performance in global virtual teams: The role of self-regulation and individual cultural value orientations

Since the onset of the COVID-19 pandemic, global virtual teams (GVTs) have become increasingly important. Drawing on conservation of resources theory and self-regulation theory, we examined the mechanism and process underlying individuals' performance in GVTs in this specific situation. We posit that the local severity of the pandemic has a negative effect on individuals' performance in GVTs and that self-regulation functions as a coping mechanism in times of pandemic-related ambient stress, reducing its negative effect on performance. We suggest that three cultural value orientations, that is, uncertainty avoidance, collectivism, and long-term orientation, explain different levels of self-regulation, which in turn moderates the relationship between the local severity of the pandemic and individual performance in GVTs. Based on a sample of 2727 individuals from 31 countries participating in an international business consulting project during the early stage of the unfolding pandemic, we show that (a) the local severity of the pandemic had a negative effect on individuals' performance, (b) the negative effect of the pandemic on performance is weaker for individuals with high self-regulation, and (c) uncertainty avoidance and long-term orientation are positively associated with self-regulation, which mediates the moderating relationship between the cultural value orientations and the relationship between the COVID-19 pandemic and individual performance in GVTs.     

异常环境下要害系统确信安全评估方法

目的 获得异常环境下的要害系统确信安全评估(PLOAS)建立评估方法和技术框架,为要害系统安全性设计和安全防护决策提供科学支撑.方法 基于要害系统在异常环境条件下结构响应行为机制,以表征安全性的响应特征参数为对象,融合试验、数值仿真等技术手段以及代理模型构建等不确定性分析方法,通过定量计算安全特征参数未达到失效阈值的概...