The Principle of Calibration Using the Ionic Current——A New Calibration Method for Electro-Magnetic Flowmeters

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New multi-camera calibration algorithm based on 1D objects

A new calibration algorithm for multi-camera systems using 1D calibration objects is proposed. The algorithm integrates the rank-4 factorization with Zhang （2004）＇s method. The intrinsic parameters as well as the extrinsic parameters are recovered by capturing with cameras the 1D object＇s rotations around a fixed point. The algorithm is based on factorization of the scaled measurement matrix, the projective depth of which is estimated in an analytical equation instead ofa recursive form. For more than three points on a 1D object, the approach of our algorithm is to extend the scaled measurement matrix. The obtained parameters are finally refined through the maximum likelihood inference. Simulations and experiments with real images verify that the proposed technique achieves a good trade-off between the intrinsic and extrinsic camera parameters.     

Determination of vitamins B2, B3, B6 and B7 in corn steep liquor by NIR and PLSR

Corn steep liquor(CSL) is an important raw material that has high nutritional value and serves as a nitrogen source.Biotin in CSL is especially of great importance to fermentation.In order to develop a fast,versatile,cheap,and environmentally safe analytical method for quantifying vitamins B2(VB2),B3(VB3),B6(VB6) and B7(VB7) in CSL,the near-infrared spectroscopy(NIR) measurements of 66 samples(22 batches) of CSL were analyzed by partial least-square regression(PLSR).Multivariate models developed in the NIR regions showed good predictive abilities for VB2,VB3,VB6 and VB7.Results confirmed the probability of the multivariate spectroscopic approach as a replacement for expensive and time-consuming conventional chemical methods.     

智能液压滑动轴承试验台测量数值的标定

介绍了智能液压滑动轴承试验台的工作原理,对试验台进行了基本标数值标定,通过改进,试验设备的稳定性与真实性大大提高。     

一种基于立方体的摄像机内参数标定方法

摄像机标定方法是计算机视觉的重要内容之一。提出了一种基于立方体的标定方法。该方法的模型为立方体,从3个或多个不同的方位摄取图像,由直径的正交关系获得3组正交灭点,从而线性的求出摄像机的5个内参数。模拟图像和真实图像实验表明,文章的自标定方法有较好的灵活性和较高的鲁棒性。     

无创血压监测仪检测技术探讨

无创血压监测仪的准确性对医疗诊断影响重大,目前我国暂无校准方法,本文采用检测装置对市场上的无创血压监测仪进行了测量分析,提出了一套检测方法,为临床监护及法定计量机构开展无创血压测量仪的检测工作提供了一定的理论依据。     

用位移传感器测量固体材料的杨氏模量

介绍了一种用位移传感器测量固体材料的杨氏模量的方法,是一种学生了解和掌握微小位移的非电量电测方法.     

分析天平灵敏度的检定和调修

分析天平是实验室广泛使用的精确测定物质质量的精密仪器．在分析天平的使用过程中，人们往往较为重视天平的操作规程，而忽略天平在长期使用过程中因受温度变化、震动、磨损等原因造成天平计量性能的失准，以至达不到天平正常使用的精度，从而给测量结果带来误差．因此，对分析天平的计量性能作定期检定和调修，是天平维护者的重要工作之一，应引起足够的重视。     

吸光光度分析中校正曲线形貌剖析

剖析了吸光光度分析中校正曲线的形态，阐述了不同形貌校正曲线对分析结果的影响及获得良好校正曲线的方法。     

The inattentive on-screen reading: Reading medium affects attention and reading comprehension under time pressure

This study explored the influence of reading media and reading time-frame on readers' on-task attention, metacognitive calibration, and reading comprehension. One hundred and forty undergraduates were allocated to one of four experimental conditions varying on the reading medium (in print vs. on screen) and on the reading time-frame (free vs. pressured time). Readers' mindwandering while reading, prediction of performance on a comprehension test, and their text comprehension were measured. In-print readers, but not on-screen readers, mindwandered less on the pressured than in the free time condition, indicating higher task adaptation in print. Accordingly, on-screen readers in the pressured condition comprehended less than the other three groups. Mindwandering and text comprehension were similar under free reading time regardless of medium. Lastly, there were no differences in readers’ metacognitive calibration. The results support the hypothesis of shallow information processing when reading on screen under time constraints.