A new method which is caIled orthogonal wavelet transform was introduced into deconvolution voltammetry to deal with discrete data containing strong random noise. From simulated data and experimental data, the process...A new method which is caIled orthogonal wavelet transform was introduced into deconvolution voltammetry to deal with discrete data containing strong random noise. From simulated data and experimental data, the processed results show that wavelet trans form would be the best method in processing complex discrete signal containing high white noise,and was compared with Fourier least square method. Wavelet transform has many merits than Fourier method.展开更多
在工地生产与建设中,工人由于未正确规范佩戴安全帽而发生的安全事故时有发生,为了保护工人的安全与降低由于为佩戴安全帽就进入施工现场而引起的意外事件的发生,提出了一种基于改进YOLOv3算法的安全帽佩戴检测方法。通过反卷积模块对...在工地生产与建设中,工人由于未正确规范佩戴安全帽而发生的安全事故时有发生,为了保护工人的安全与降低由于为佩戴安全帽就进入施工现场而引起的意外事件的发生,提出了一种基于改进YOLOv3算法的安全帽佩戴检测方法。通过反卷积模块对网络进行上采样而增加网络在小物体上的表达能力来提高网络的检测准确度。理论分析与实验结果表明,改进的D-YOLOv3网络在检测速率不下降的情况下,mAP(Mean Average Precision)达到了88.8%,其准确率相较于YOLOv3有一定的提高,所提出的算法满足安全帽检测任务的准确性与实时性的要求。展开更多
Using a wavelet function as the filter function of Fourier self-deconvolution, a new method of resolving overlapped peaks, wavelet-Fourier self-deconvolution, is founded. The properties of different wavelet deconvolut...Using a wavelet function as the filter function of Fourier self-deconvolution, a new method of resolving overlapped peaks, wavelet-Fourier self-deconvolution, is founded. The properties of different wavelet deconvolution functions are studied. In addition, a cutoff value coefficient method of eliminating artificial peaks and wavelet method of removing shoulder peaks using the ratio of maximum peak to minimum peak is established. As a result, some problems in classical Fourier self-deconvolution are solved, such as the bad result of denoising, complicated processing, as well as usual appearance of artificial and shoulder peaks. Wavelet-Fourier self-deconvolution is applied to determination of multi-components in oscillographic chronopotentiometry. Experimental results show that the method has characteristics of simpler process and better effect of processing.展开更多
With permanent down-hole gauges （PDGs） widely installed in oilfields around the world in recent years, a continuous stream of transient pressure data in real time is now available, which motivates a new round of res...With permanent down-hole gauges （PDGs） widely installed in oilfields around the world in recent years, a continuous stream of transient pressure data in real time is now available, which motivates a new round of research interests in further developing pressure transient processing and analysis techniques. Transient pressure measurements from PDG are characterized by long term and high volume data. These data are recorded under unconstrained circumstances, so effects due to noise, rate fluctuation and interference from other wells cannot be avoided. These effects make the measured pressure trends decline or rise and then obscure or distort the actual flow behavior, which makes subsequent analysis difficult. In this paper, the problems encountered in analysis of PDG transient pressure are investigated. A newly developed workflow for processing and analyzing PDG transient pressure data is proposed. Numerical well testing synthetic studies are performed to demonstrate these procedures. The results prove that this new technique works well and the potential for practical application looks very promising.展开更多
文摘A new method which is caIled orthogonal wavelet transform was introduced into deconvolution voltammetry to deal with discrete data containing strong random noise. From simulated data and experimental data, the processed results show that wavelet trans form would be the best method in processing complex discrete signal containing high white noise,and was compared with Fourier least square method. Wavelet transform has many merits than Fourier method.
文摘在工地生产与建设中,工人由于未正确规范佩戴安全帽而发生的安全事故时有发生,为了保护工人的安全与降低由于为佩戴安全帽就进入施工现场而引起的意外事件的发生,提出了一种基于改进YOLOv3算法的安全帽佩戴检测方法。通过反卷积模块对网络进行上采样而增加网络在小物体上的表达能力来提高网络的检测准确度。理论分析与实验结果表明,改进的D-YOLOv3网络在检测速率不下降的情况下,mAP(Mean Average Precision)达到了88.8%,其准确率相较于YOLOv3有一定的提高,所提出的算法满足安全帽检测任务的准确性与实时性的要求。
文摘Using a wavelet function as the filter function of Fourier self-deconvolution, a new method of resolving overlapped peaks, wavelet-Fourier self-deconvolution, is founded. The properties of different wavelet deconvolution functions are studied. In addition, a cutoff value coefficient method of eliminating artificial peaks and wavelet method of removing shoulder peaks using the ratio of maximum peak to minimum peak is established. As a result, some problems in classical Fourier self-deconvolution are solved, such as the bad result of denoising, complicated processing, as well as usual appearance of artificial and shoulder peaks. Wavelet-Fourier self-deconvolution is applied to determination of multi-components in oscillographic chronopotentiometry. Experimental results show that the method has characteristics of simpler process and better effect of processing.
基金Science Foundation of China University of Petroleum, Beijing (No.YJRC-2011-02)for the financial support during this research
文摘With permanent down-hole gauges （PDGs） widely installed in oilfields around the world in recent years, a continuous stream of transient pressure data in real time is now available, which motivates a new round of research interests in further developing pressure transient processing and analysis techniques. Transient pressure measurements from PDG are characterized by long term and high volume data. These data are recorded under unconstrained circumstances, so effects due to noise, rate fluctuation and interference from other wells cannot be avoided. These effects make the measured pressure trends decline or rise and then obscure or distort the actual flow behavior, which makes subsequent analysis difficult. In this paper, the problems encountered in analysis of PDG transient pressure are investigated. A newly developed workflow for processing and analyzing PDG transient pressure data is proposed. Numerical well testing synthetic studies are performed to demonstrate these procedures. The results prove that this new technique works well and the potential for practical application looks very promising.
