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地磁导航是通过对地球周围矢量磁场进行测量从而实现导航的一种方法. 地磁导航在运动平台上应用的难点之一是平台剩磁对地磁测量的影响, 严重污染了磁强计的测量. 消除平台剩磁对地磁测量的影响是地磁导航向应用转化的一项关键技术. 为实现运动平台剩磁的有效测量与估计, 提出了基于递推最小二乘法的运动平台剩磁差分测量与估计方法. 基于载体干扰磁场值只与测量点到磁偶极子的距离和磁偶极子的磁矩有关的结论, 根据磁偶极子的磁场分布特性, 推导出一种基于内置磁强计阵列的运动平台剩磁差分估计模型, 并通过递推最小二乘法求解差分估计模型. 大量仿真实验表明, 可以通过内置阵列磁强计对平台剩磁进行测量与估计, 验证了所提出的平台剩磁估计方法的有效性.

Objective To improve the detection ability and to know the current situation of Chongqing point of care testing (POCT) of cardiac troponin by analyzing the external quality assessment (EQA) of cardiac troponin POCT from 2018 to 2023 in Chongqing. Methods The results of troponin POCT EQA laboratory in Chongqing Center for Clinical Laboratory from 2018 to 2023 were collected and statistically analyzed. Results From 2018 to 2023, the number of laboratories participating in Chongqing's troponin POCT EQA increased from 36 to 88, the number of instrument brand groupings used increased from none to 8, and the qualified rate of each batch of laboratories increased from the lowest 26. 32% to the highest 89.77%. However, there was still a large difference in the target values of each instrument brand grouping. The variable coefficients of grouped target value for each batch varied from 44.72% to 105.69% in 2023. Conclusion The participation rate and detection level of Chongqing cardiac troponin POCT EQA needs to be improved and troponin POCT should be continuously included in EQA plan to regularly monitor the detection quality of this project in the whole city, so as to provide rapid and reliable guarantee for clinical diagnosis and treatment. [ABSTRACT FROM AUTHOR]

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Constitutive model of stone masonry is an important foundation and prerequisite for physical calculation and finite element numerical simulation of stone masonry. In order to further study the constitutive relationship of stone masonry under uniaxial compression, based on the theory of damage mechanics, the two-parameter Weibull distribution function was applied to reflect the damage variable, and its parameters were determined according to the characteristic conditions of the whole process of the stress-strain curve of stone masonry under uniaxial compression. The uniaxial compression damage constitutive model of stone masonry was derived and established, and the correctness of the constitutive model was verified by the existing test data. The constitutive model was compared with the typical masonry constitutive model. Finally, the finite element analysis of the existing stone masonry arch bridge test was carried out to verify the applicability of the constitutive model. The results show that the model is in good agreement with the uniaxial compression test results of existing stone masonry. The established model verifies the general law of masonry damage evolution and accords with the general trend of typical masonry constitutive model. The model can be applied to the finite element analysis and calculation of masonry structure with good applicability. [ABSTRACT FROM AUTHOR]

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