食品检测实验室仪器设备期间核查实施方法探讨

根据食品检测实验室的特点,对实验室进行仪器设备期间核查的必要性进行了阐述,详述了仪器设备期间核查的范围、核查条件、实施步骤、判别原则和判别方法等.     

稳像平台准确测试系统的研究和设计

对稳像平台的准确测试系统的设计和研制进行了探讨,提出了一种新的采用虚拟仪器软件Labview对前端CCD输出的图像数据进行采集和处理的稳像平台准确测试系统方案.结合稳像平台准确测试系统的具体要求阐述了对系统进行设计的理论,并对采用本方案进行实际设计时的具体步骤、参数取值、测量最大范围、误差估计以及软件设计流程给出了具体的设计方法和参数计算公式.     

Asymptotic normality and confidence intervals for inverse regression models with convolution-type operators

We consider inverse regression models with convolution-type operators which mediate convolution on (d≥1) and prove a pointwise central limit theorem for spectral regularisation estimators which can be applied to construct pointwise confidence regions. Here, we cope with the unknown bias of such estimators by undersmoothing. Moreover, we prove consistency of the residual bootstrap in this setting and demonstrate the feasibility of the bootstrap confidence bands at moderate sample sizes in a simulation study.     

非参数可加回归模型和非线性协整检验

本文基于非参数可加回归模型的局部核权最小二乘法提出变量间非线性协整的一种非参数检验方法。     

Future direction for measurement,testing and conformity assessment

Measurement and testing are of fundamental importance to science, technology and the economy. There is no science without measurements, no quality without testing and no global market without standards. This article tries to look into the future for the testing community. Based on the anticipated changes in the environment for the testing activities a prediction of the coming technical development as well as acceptance of test results is given. Also the future of accreditation is discussed.     

基于主列筛选的动态测试传感器配置方法研究

动态测试是获取结构真实动态特性的重要手段之一,传感器配置对于保证动态测试数据的信息量有着重要的影响. 尤其是对以试验模态分析为目标的动态测试,传感器配置对于模态分辨率更是决定性因素. 在振型独立性的基础上,提出了一种基于主列筛选的传感器配置方法. 与现有的逐步累积类或逐步消减类方法相比,该方法无需迭代,一次选择所有测试自由度,计算量小. 为了量化比较传感器配置的效果,定义了4个度量指标. 采用卫星天线模型进行了数值仿真,结果验证了基于主列筛选的传感器配置方法的有效性.      

Accreditation of RM producers: what does it mean?

A comparative study of different papers published in this special edition of ACQUAL "Accreditaton of RM producers" (see Editorial) is presented. The main question is: Is accreditation the key to guaranteeing the quality of RMs or is it certification? The arguments and different options of the authors are compared and evaluated against existing rules and present practice. In the conclusion options are given which depend on the type of RM producer (namely, laboratory or product certification body), and which could be acceptable to the community of analysts and metrologists, as well as to the market.     

基于有限元的空耦超声相控阵Lamb波激发与检测

基于非接触式空气耦合超声换能器的无损检测技术在常规板材、纤维复合材料、层状结构材料、粘接界面等的检测中有了长足的发展。但是因为空气耦合超声本身的限制,对于如何提高空气声换能器的发射效率和接收灵敏度、提高检测中接收的信噪比成为这一领域的重要课题。因此有必要结合最新的信号处理技术探索新的无损检测形式。本文通过提出了基于电容式的空气声换能器阵列的构建和制作方法,应用有限元数值方法对一维线阵的空气声换能器阵列的动态偏转特性进行了模拟,并使用构建流固耦合模型对二维的空气声场及板材中的位移场进行计算。通过一维空气耦合相控阵的声束动态偏转激励了各向同性板中的Lamb波A₀ 和S₀模式,并进行了分析,验证了此模型可以进一步用于基于空气耦合相控阵激励的Lamb波的无损检测中。     

冷藏陈列柜热工性能实验室设计

对冷藏陈列柜测试室进行设计,参照GB/T 21001.2 - 2007和EN441 -2标准,测试室全自动控制运行,操作方便,设计方案满足了用户的需求.