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A Novel Rolling Bearing Vibration Impulsive Signals Detection Approach Based on Dictionary Learning

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IEEE/CAA Journal of Automatica Sinica 2021年第6期8卷 1188-1198页

作者： chuan sun Hongpeng Yin Yanxia Li Yi Chai School of Big Data&Software Engineering Chongqing UniversityChongqing 401331China Key Laboratory of Complex System Safety and Control Ministry of EducationChongqing UniversityChongqing 400044China

The localized faults of rolling bearings can be diagnosed by its vibration impulsive ***,it is always a challenge to extract the impulsive feature under background noise and non-stationary *** paper investigates impulsive signals detection of a single-point defect rolling bearing and presents a novel data-driven detection approach based on dictionary *** overcome the effects harmonic and noise components,we propose an autoregressive-minimum entropy deconvolution model to separate harmonic and deconvolve the effect of the transmission *** address the shortcomings of conventional sparse representation under the changeable operation environment,we propose an approach that combines K-clustering with singular value decomposition(K-SVD)and split-Bregman to extract impulsive components *** experiments on synthetic signals and real run-to-failure signals,the excellent performance for different impulsive signals detection verifies the effectiveness and robustness of the proposed ***,a comparison with the state-of-the-art methods is illustrated,which shows that the proposed approach can provide more accurate detected impulsive signals.

关键词： Dictionary learning impulsive signals detection Kclustering with singular value decomposition(K-SVD) minimum entropy deconvolution rolling bearing signal processing

Microstructural Characterization of Spray Formed FGH4095 Superalloy During Hot Deformation

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Journal of Iron and Steel Research International 2013年第7期20卷 57-62页

作者： XU Yi SHU Qin GUO Biao sun chuan-shui School of Materials Science and Engineering Southwest Jiaotong University

In order to study the hot workability and to optimize the processing parameters for spray formed FGH4095 superalloy, thermal compression tests for spray formed FGH4095 superalloy have been finished by using a Gleeble 1500 thermal simulated test machine at the strain rates of 0.01-10.0 s 1 and temperatures of 1 050-1 140 ℃. The effects of strain rate and deformation temperature on the true stress-true strain curves and microstructure evolution were investigated. The results show that the generation of dynamic recrystallization （DRX） depends sensitively on deformation temperature. When the temperature was lower than 1080 ~C, long and＂ narrow necklace grains were shown in the microstructure. When the temperature increased to 1 140 ℃, new recrystallization grains were genera-ted. The size and shape of X＇ precipitates in the grains have a very important effect as factors of hindering sufficient migration of dislocations on plastic deformation. The result of thermal processing map is in accord with the micro-structure observation, and the best material thermal processing temperature is above 1 128 ℃.

关键词： spray forming microstructure FGH4095 superalloy dynamic recrystallization dislocation thermalprocessing map

Permeable carbon fiber based thermoelectric film with exceptional EMI shielding performance and sensor capabilities

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Journal of Advanced Ceramics 2024年第8期13卷 1119-1131页

作者： Junjie Zhu chuan sun Wanlin Feng Mengran Chen Peng-An Zong Chunlei Wan College of Materials Science and Engineering Nanjing Tech UniversityNanjing 211800China Nationai Innovation Institute of Defense Technology Academy of Military Sciences of the People's Liberation Army of ChinaBeijing 100089China Institute of Nuclear Physics and Chemistry Innovation Research Team for Advanced CeramicsChina Academy of Engineering PhysicsMianyang 621900China State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China

Thermoelectric(TE)technologies offer a promising approach for directly converting skin heat into electricity for wearable *** p-type Sb2Tes and n-type BizTes as top-performing materials at room temperature,their rigid inorganic structure,with ultralow moisture permeability,poses challenges in warm and humid conditions,fostering bacterial growth and potential skin *** address this issue,we developed a cross-linked core-shell structure by electrodepositing Sb_(2)Te_(3)(Bi_(2)Te_(3))onto carbon fiber(CF).This architecture significantly improved the electrical conductivity and the Seebeck coefficient,resulting in a remarkable 300-fold increase in the power factor compared to that of pure *** CF/Sb_(2)Te_(3) and CF/Bi2Te films demonstrated optimal power factors of 450 and 121μW·m^(-1)·K^(-2),***,the fabricated films exhibited outstanding moisture permeability,over 3000 g·m^(-2)·d^(-1),exceptional electromagnetic interference shielding efficiency approaching 93 dB,and versatility as sensors for language assistance and respiratory *** attributes underline their broad applicability,emphasizing their suitability for human health protection in diverse scenarios.

关键词： thermoelectric(TE) carbon fiber(CF) Bi_(2)Te_(3) electrodeposition moisture permeability electromagnetic interference shielding

Evaluation of H2 Influence on the Evolution Mechanism of NOx Storage and Reduction over Pt–Ba–Ce/c-Al2O3 Catalysts

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Engineering 2019年第3期5卷 568-575页

作者： Pan Wang Jing Yi chuan sun Peng Luo Lili Lei School of Automotive and Traffic Engineering Jiangsu University Zhenjiang 212013 China

In this investigation, Pt–Ba–Ce/c-Al2O3 catalysts were prepared by incipient wetness impregnation and experiments were performed to evaluate the influence of H2 on the evolution mechanism of nitrogen oxides (NOx) storage and reduction (NSR). The physical and chemical properties of the Pt–Ba–Ce/c- Al2O3 catalysts were studied using a combination of characterization techniques, which showed that PtOx, CeO2, and BaCO3, whose peaks were observed in X-ray diffraction (XRD) spectra, dispersed well on the c-Al2O3, as shown by transmission electron microscope (TEM), and that the difference between Ce3+ and Ce4+, as detected by X-ray photoelectron spectroscopy (XPS), facilitated the migration of active oxygen over the catalyst. In the process of a complete NSR experiment, the NOx storage capability was greatly enhanced in the temperature range of 250–350℃, and reached a maximum value of 315.3μmol·gcat^-1 at 350℃, which was ascribed to the increase in NO2 yield. In a lean and rich cycling experiment, the results showed that NOx storage efficiency and conversion were increased when the time of H2 exposure (i.e., 30, 45, and 60 s) was extended. The maximum NOx conversion of the catalyst reached 83.5% when the duration of the lean and rich phases was 240 and 60 s, respectively. The results revealed that increasing the content of H2 by an appropriate amount was favorable to the NSR mechanism due to increased decomposition of nitrate or nitrite, and the refreshing of trapping sites for the next cycle of NSR.

关键词： Pt–Ba–Ce/c-Al2O3 catalysts Physicochemical properties NOx storage and reduction emission H2 reductant

Adjuvant therapies after curative treatments for hepatocellular carcinoma: Current status and prospects

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Genes & Diseases 2020年第3期7卷 359-369页

作者： Xiao-Dong Zhu Kang-Shuai Li Hui-chuan sun Department of Liver Surgery and Transplantation Liver Cancer Institute and Zhongshan HospitalFudan UniversityShanghai200032China

Tumor recurrence rate after surgery or ablation of hepatocellular carcinoma(HCC)is as high as 70%.However,there are no widely accepted adjuvant therapies;therefore,no treatment has been recommended by guidelines from the American Association for the Study of Liver Disease or the European Association for the Study of the *** the registered trials failed to find any treatment to prolong recurrence-free survival,which is the primary outcome in most studies,including *** investigator-initiated studies revealed that antihepatitis B virus agents,interferon-a,transcatheter chemoembolization,chemokine-induced killer cells,and other treatments prolonged patient recurrence-free survival or overall survival after curative *** this review,we summarize the current status of adjuvant treatments for HCC and explain the challenges associated with designing a clinical trial for adjuvant *** new treatments being used as adjuvant therapy,especially anti-PD-1 antibodies,are also discussed.

关键词： Adjuvant therapy Anti-PD-1 antibody Clinical trial Hepatocellular carcinoma Molecular targeted therapy Recurrence-free survival

Targeting angiogenesis for liver cancer: Past, present, and future

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Genes & Diseases 2020年第3期7卷 328-335页

作者： Xiao-Dong Zhu Zhao-You Tang Hui-chuan sun Department of Liver Surgery and Transplantation Liver Cancer Institute and Zhongshan HospitalFudan UniversityShanghai200032China

Liver cancer,mostly hepatocellular carcinoma(HCC),is the second leading cause of cancer mortality *** patients were diagnosed at an advanced stage,and systemic therapy is the standard of *** the approved systemic therapies for HCC are molecular targeted therapies with anti-angiogenic effects targeting the vascular endothelial growth factor signaling *** and lenvatinib are the first-line treatment,and regorafenib,ramucirumab,and cabozantinib are second-line treatment *** anti-PD-1 antibodies,including nivolumab and pembrolizumab,demonstrated promising anti-tumor effects as monotherapy for advanced HCC in phase II clinical trials,both failed in phase III ***-angiogenic treatment remains the backbone of systemic therapy for *** this review,we summarized the approved anti-angiogenic medicines and discussed the potential strategies to improve the efficacy of anti-angiogenic therapy,including combination therapy with other treatments,and discussed the approaches to overcome the drawbacks of anti-angiogenic therapies.

关键词： Anti-angiogenic therapy Combinational therapy Hepatocellular carcinoma Molecular targeted therapy Systemic therapy

Saliency Detection via Manifold Ranking Based on Robust Foreground

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International Journal of Automation and computing 2021年第1期18卷 73-84页

作者： Wei-Ping Ma Wen-Xin Li Jin-chuan sun Peng-Xia Cao Lanzhou Institute of Physics China Academy of Space TechnologyLanzhou 730000China

The graph-based manifold ranking saliency detection only relies on the boundary background to extract foreground seeds,resulting in a poor saliency detection result,so a method that obtains robust foreground for manifold ranking is proposed in this ***,boundary connectivity is used to select the boundary background for manifold ranking to get a preliminary saliency map,and a foreground region is acquired by a binary segmentation of the ***,the feature points of the original image and the filtered image are obtained by using color boosting Harris corners to generate two different convex *** the intersection of these two convex hulls,a final convex hull is ***,the foreground region and the final convex hull are combined to extract robust foreground seeds for manifold ranking and getting final saliency *** results on two public image datasets show that the proposed method gains improved performance compared with some other classic methods in three evaluation indicators:precision-recall curve,F-measure and mean absolute error.

关键词： Saliency detection manifold ranking boundary connectivity convex hull robust foreground

High-volumetric-capacity WSe2 Anode for Potassium-ion Batteries

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Chinese Journal of Structural Chemistry 2021年第7期40卷 926-932,840页

作者： CHEN Ming ZHAO Jun-Mei sun chuan-Fu College of Chemistry and Materials Science Fujian Normal UniversityFuzhou 350007China CAS Key Laboratory of Design and Assembly of Functional Nanostructures and Fujian Key Laboratory of NanomaterialsFujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China Innovation Academy for Green Manufacture Chinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100039China

Exploring high-capacity electrode materials is critical for the development of K-ion *** this work,we report a layered-structured tungsten selenide(WSe2)anode,which not only delivers an ultrahigh volumetric capacity of 1772.8 Ah/L(or 188.4 mAh/g)at a current density of 5 mA/g but also exhibits good rate capability(72 mAh/g at 200 mA/g)and cycling stability(83.14%capacity retention over 100 cycles at 100 mA/g).We have also revealed the underlying reaction mechanism through ex situ X-ray powder ***,proof-of-concept full-cell batteries comprising of WSe2 anodes and Prussian Blue cathodes are capable of delivering an energy density of 135.2 Wh/kgcathode+*** work highlights the potential of WSe2 as a promising high-volumetric-capacity anode material for rechargeable potassium-ion batteries.

关键词： tungsten selenide potassium-ion batteries high volumetric capacity conversion reaction

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Liquid-phase Exfoliated WS2-Graphene Composite Anodes for Potassium-ion Batteries

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Chinese Journal of Structural Chemistry 2020年第3期39卷 493-499,378页

作者： WANG Wei BAO Jing-Ze sun chuan-Fu CAS Key Laboratory of Design and Assembly of Functional Nanostructures and Fujian Key Laboratory of NanomaterialsFujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China University of Chinese Academy of Sciences Beijing 100190China

Tungsten disulfide(WS2) has been recognized as a promising anode material for rechargeable potassium-ion batteries(PIBs). However, its K-ion intercalation capacity is limited to ~60 mAh·g^(-1). Here, we report a WS2-graphene composite anode which is fabricated through simple filtration of liquid-phase exfoliated WS2 and graphene nanosheet delivers a significantly improved specific capacity of 137 mAh·g^(-1) at a current density of 10 mA·g^(-1). The composite anodes also exhibit remarkable rate capability and long-term cyclability over 500 cycles. These results highlight the WS2-graphene composite structure as a promising anode material for long lifespan rechargeable potassium-ion batteries.

关键词： tungsten disulfide liquid-phase exfoliation K-ion battery grapheme