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baseline drift effect on the performance of neutron and γ ray discrimination using frequency gradient analysis

Chinese Physics C 2013年第6期37卷 63-69页

作者：刘国福罗晓亮杨俊林存宝胡青青彭进先 Department of Instrument Science and Technology National University of Defense Technology

Frequency gradient analysis （FGA） effectively discriminates neutrons and γ rays by examining the frequency-domain features of the photomultiplier tube anode signal. This approach is insensitive to noise but is inevitably affected by the baseline drift similar to other pulse shape discrimination methods. The baseline drift effect is attributed to factors such as power line fluctuation, dark current, noise disturbances, hum, and pulse tail in front-end electronics. This effect needs to be elucidated and quantified before the baseline shift can be estimated and removed from the captured signal. Therefore, the effect of baseline shift on the discrimination performance of neutrons and ~ rays with organic scintillation detectors using FGA is investigated in this paper. The relationship between the baseline shift and discrimination parameters of FGA is derived and verified by an experimental system consisting of an americium-beryllium source, a BC501A liquid scintillator detector, and a 5 GSample/s 8-bit oscilloscope. The theoretical and experimental results both show that the estimation of the baseline shift is necessary, and the removal of baseline drift from the pulse shapes can improve the discrimination performance of FGA.

关键词： baseline drift frequency gradient analysis digital discrimination liquid scintillator

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Cell counting for in vivo flow cytometry signals with baseline drift

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Journal of Innovative Optical Health Sciences 2017年第3期10卷 133-142页

作者： Xiaoling Wang Yuanzhen Suo Dan Wei Hao He Fan Wu Xunbin Wei Med-X Research Institute and School of Biomedical Engineering Shanghai Jiao Tong University 1954 Huashan Road Shanghai 200030P.R.China School of Naval Architecture Ocean and Civil Engineering Shanghai Jiao Tong University800 Dongchuan Road Shanghai 200240P.R.China

In biomedical research fields,the in vio Aow cytometry(IVFC)is a widely used technology which is able to monitor target cells dynamically in living *** the setup of IVFC system has been well established,baseline drift is still a challenge in the process of quantifying circulating *** methods,i.e.,the dynamic peak picking method,counted cells by setting a static threshold without considering the baseline drift,leading to an inaccurate cell ***,we developed a method of cell counting for IVFC data with baseline drift by interpolation fitting,automatic segmentation and wavelet-based *** demonstrated its performance for IVFC signals with three types of representative baseline *** with non-baseline correction methods,this method showed a higher sensitivity and specificity,as well as a better result in the Pearson's correlation coefficient and the mean-squared error(MSE).

关键词： In vivo fow cytometry cell counting baseline drift signal processing.

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Application of Converted Displacement for Modal Parameter Identification of Offshore Wind Turbines with High-Pile Foundation

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Journal of Ocean University of China 2022年第6期21卷 1467-1478页

作者： LI Ying WANG Bin LIU Qiang GAO Shan LU Sujie Chinese-German Institute of Engineering Zhejiang University of Science and TechnologyHangzhou 310023China Key Laboratory of Far-Shore Wind Power Technology of Zhejiang Province Hangzhou 311122China PowerChina Huadong Engineering Corporation Limited Hangzhou 311122China Zhejiang Huadong Mapping and Engineering Safety Technology Co. Ltd.Hangzhou 310014China

In the actual measurement of offshore wind turbines(OWTs),the measured accelerations usually contain a large amount of noise due to the complex and harsh marine environment,which is not conducive to the identification of structural modal *** OWTs with remarkably low structural modal frequencies,displacements can effectively suppress the high-frequency vibration noise and amplify the low-frequency vibration of the ***,finding a reference point to measure structural displacements at sea is ***,only a few studies on the use of dynamic displacements to identify the modal parameters of OWTs with high-pile foundations are ***,this paper develops a displacement conversion strategy to study the modal parameter identification of OWTs with high-pile *** developed strategy can be divided into the following three parts:zero-order correction of measured acceleration,high-pass filtering by the Butterworth polynomial,and modal parameter identification using the calculated *** superiority of the proposed strategy is verified by analyzing a numerical OWT with a high-pile foundation and the measured accelerations from an OWT with a high-pile *** results show that for OWTs with high-pile foundations dominated by low frequencies,the developed strategy of converting accelerations into displacements and then performing modal parameter identification is advantageous to the identification of modal parameters,and the results have high accuracy.

关键词： offshore wind turbine high-pile foundation modal parameter identification baseline drift low-frequency noise

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A Novel Bioelectric Amplifier for Non-Invasion Recording Sinus Node Electrogram

A Novel Bioelectric Amplifier for Non-Invasion Recording Sin...

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第三届国际仪器科学技术学术研讨会

作者： ZHOU Yan CAI Yu-ying School of Mechanical Engineering Nanjing University of Science and Technology Nanjing 210094 China

Until the present the Sinus Node Electrogram (SNE) can only be recorded in cavity. The recording process was injurious to patient body and there was false wave in the recorded SNE. In order to record

关键词： bioelectric amplifier baseline drift transition process SNE SN potential false wave

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