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937 results on '"Fan, Zi"'

6. Global Sensing and Measurements Reuse for Image Compressed Sensing

Author

Fan, Zi-En, Lian, Feng, and Quan, Jia-Ni

Subjects
Computer Science - Computer Vision and Pattern Recognition, Electrical Engineering and Systems Science - Image and Video Processing
Abstract

Recently, deep network-based image compressed sensing methods achieved high reconstruction quality and reduced computational overhead compared with traditional methods. However, existing methods obtain measurements only from partial features in the network and use them only once for image reconstruction. They ignore there are low, mid, and high-level features in the network\cite{zeiler2014visualizing} and all of them are essential for high-quality reconstruction. Moreover, using measurements only once may not be enough for extracting richer information from measurements. To address these issues, we propose a novel Measurements Reuse Convolutional Compressed Sensing Network (MR-CCSNet) which employs Global Sensing Module (GSM) to collect all level features for achieving an efficient sensing and Measurements Reuse Block (MRB) to reuse measurements multiple times on multi-scale. Finally, experimental results on three benchmark datasets show that our model can significantly outperform state-of-the-art methods.

Published
2022

31. Analysis on Corrosion Leakage Causes of Stainless Steel Corrugated Heat Exchanger Plate

Author

ZHENG Jian-jun, FAN Zi-ming, TIAN Feng, CHEN Hao, SUN Yun-fei

Subjects
plate heat exchanger, corrugated heat exchanger plate, pitting corrosion, newton's ring, leakage, Materials of engineering and construction. Mechanics of materials, TA401-492, Technology
Abstract

During the operation of plate type radiator used in a certain project, the stainless steel corrugated heat exchanger plate experienced a leakage fault. In this paper, the leakage causes of corrugated heat exchanger plate were comprehensively analyzed by means of macro morphology analysis, chemical composition analysis, metallographic microstructure examination, observation of microscopic morphology by scanning electron microscope (SEM) and X-ray energy dispersive spectroscopy (EDS). Results indicated that the roughness of the high temperature oxidation film formed on corrugated heat exchanger surface, especially the center of Newton's ring, was large. This point was also the bulge of the cold stamping groove with high density of dislocations. And this point was the protrusion of the cold stamping groove, with a higher dislocation density. During the process of long-term operation, Cl- continuously accumulated at this location, forming pitting nuclei and ultimately inducing pitting. In addition, under the effect of the cold stamping residual stresses remained in the heat exchanger substrate, the stress corrosion in local areas would also be triggered. With the increasing degree of pitting corrosion and stress corrosion, the thickness of the corrugated heat exchanger plate was gradually decreased and ultimately led to leakage. It was suggested that the source of Cl element and the formation causes of high-temperature oxide films should be investigated, then the targeted improvement measures could be developed.

Published
2023
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41. Influence of Diene Rubber Combustion Residue on the Identification of Gasoline in Fire Debris

Author

LI Qiu-fan-zi, JIN Jing, LI Kang-xu, TENG Han-fei, DENG Liang, and ZHANG Jin-zhuan

Subjects
diene rubber, false positive, false negative, combustion residues, gas chromatography-mass spectrometry (gc-ms), evidence identification, Chemistry, QD1-999
Abstract

The identification of accelerant about gasoline and other ignited liquids in arson has always been a difficult problem in the field of physical evidence identification. How to avoid “false positive” and “false negative” results is a key issue. To study the interference of diene rubber on gasoline identification from two aspects of “false positives” and “false negatives”, and to explore its degree when gasoline was mixed with diene rubber in different proportions, the combustion residues obtained from cis-polybutadiene rubber, isobutylene isoprene rubber and styrene butadiene rubber after loading different amounts of gasoline were compared using gas chromatography-mass spectrometry (GC-MS). The results showed that alkanes, alkenes/cycloalkanes, aromatic-alkylbenzenes, homologs of indenes and indanes, alkylnaphthalenes and polycyclic aromatic hydrocarbons were detected in the combustion residues of the three kinds of diene rubber samples before and after gasoline loading, which was consistent with gasoline in terms of the characteristic components categories and had strong interference with gasoline identification. After loading 0.05 mL and 0.1 mL gasoline respectively into 5 g rubber sample, there was no significant changes in the characteristic components of cycloalkanes/alkenes, alkylnaphthalenes, and polycyclic aromatic hydrocarbons in the rubber combustion residues. The number and relative peak area ratio of characteristic peaks corresponding to aromatic-alkylbenzenes, homologs of indenes and indanes changed to different degrees, while the changes of alkylbenzenes were more representative. Loading gasoline or not had little effect on the ratio of the characteristic peaks of C2 benzene components in the combustion residues of cis-polybutadiene rubber. The ratio among three characteristic peaks of C2 benzene components in the combustion residues of isobutylene isoprene rubber and styrene butadiene rubber samples changed significantly when the gasoline loading amount reached 0.1 mL. This study can provide important references for the gasoline identification when there is a presence of diene rubber matrix in practical work.

Published
2023
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