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Real-time K-TIG welding penetration prediction on embedded system using a segmentation-LSTM model

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Advances in Manufacturing 2023年第3期11卷 444-461页

作者： Yong-Hua Shi Zi-Shun wang Xi-yin Chen Yan-Xin Cui Tao Xu jin-yi wang School of Mechanical and Automotive Engineering South China University of TechnologyGuangzhou 510006People's Republicof China

Keyhole tungsten inert gas(K-TIG)welding is capable of realizing single-sided welding and double-sided forming and has been widely used in medium and thick plate *** order to improve the accuracy of automatic weld identification and weld penetration prediction of robot in the process of large workpiece welding,a two-stage model is proposed in this paper,which can monitor the K-TIG welding penetration state in real time on the embedded system,called segmentation-LSTM *** proposed system extracts 9 weld pool geometric features with segmentation network,and then extracts the weld gap using a traditional *** these 10-dimensional features are input into the LSTM model to predict the penetration state,including under penetration,partial penetration,good penetration and over *** recognition accuracy of the proposed system can reach 95.2%.In this system,to solve the difficulty of labeling data and lack of segmentation accuracy,an improved LabelMe capable of live-wire annotation tool and a novel loss function were proposed,*** latter was also called focal dice loss,which enabled the network to achieve a performance of 0.933 mloU on the testing ***,an improved slimming strategy compresses the network,making the segmentation network achieve real-time on the embedded system(RK3399pro).

关键词： Keyhole tungsten inert gas(K-TIG)welding Penetration state prediction Segmentation-LSTM model Embedded system Focal dice loss Improved LabelMe

Direct Z-scheme CdFe_(2)O_(4)/g-C3N4 hybrid photocatalysts for highly efficient ceftiofur sodium photodegradation

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Journal of Materials Science & Technology 2020年第21期56卷 133-142页

作者： Miao-Miao Fang Jun-Xia Shao Xiang-Gang Huang jin-yi wang Wei Chen School of Pharmaceutical and Materials Engineering Taizhou UniversityTaizhou 318000China

A direct Z-scheme CdFe_(2)O_(4)/g-C3N4 hybrid systems with different weight ratios of CdFe2O4 nanoparticles were successfully designed and constructed for ceftiofur sodium *** as-obtained CdFe_(2)O_(4)/g-C_(3)N_(4) hybrid samples composed of CdFe_(2)O_(4) nanoparticles and g-C3N4 nanosheets were systematically characterized by different techniques including X-ray diffraction,scanning electron microscope,transmission electron microscope,Fourier transform infrared spectroscopy,X-ray photoelectron spectroscopy,UV–vis DRS,chemical oxygen demand,inductively coupled plasma mass spectrometer,photochemical test and electron spin resonance spectrometer *** optimal photocatalytic activity for ceftiofur sodium photodegradation was achieved by modulating the weight ration between CdFe_(2)O_(4) nanoparticles and g-C_(3)N_(4) *** result from photocatalytic tests indicate that Cd Fe_(2)O_(4)/g-C_(3)N_(4)-2 hybrid sample exhibit highly efficient photocatalytic activity towards ceftiofur sodium removal in comparison with pristine CdFe_(2)O_(4) nanoparticles and pure g-C_(3)N_(4) *** the excellent photocatalytic stability of CdFe_(2)O_(4)/g-C_(3)N_(4)-2 hybrid sample was also verified during recycling runs towards photocatalytic ceftiofur sodium *** significant enhancement of photocatalytic activity was attributed to the Z-scheme charge separation and transfer based on the construction of tight heterogeneous interface and well-matched band *** expect this research to provide a new insight into the design and preparation of direct Z-scheme hybrid photocatalysts for environmental remediation.

关键词： CdFe2O4 g-C3N4 Z-scheme Photodegradation

Processes and causes of Phanerozoic tectonic evolution of the western Tarim Basin,northwest China

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Petroleum Science 2020年第2期17卷 279-291页

作者： Teng-Fei wang Zhen-Kui jin He Li Dong-Qing Liu Ri-Hui Cheng Shu-Ting Shi jin-yi wang Faculty of Land Resources Engineering Kunming University of Science and TechnologyKunming 650093China College of Geosciences China University of Petroleum(Beijing)Beijing 102249China College of Earth Sciences Jilin UniversityChangchun 130061JilinChina Geological Research Center Bureau of Geophysical ProspectingZhuozhou 072751HebeiChina Shenzhen Branch of CNOOC China Limited Shenzhen 518000GuangdongChina

This paper addresses the Phanerozoic tectonic evolution of the western Tarim Basin based on an integrated stratigraphic,structural and tectonic analysis.P-wave velocity data show that the basin has a stable and rigid *** western Tarim Basin experienced a complex tectonic evolutionary history,and this evolution can be divided into six stages:Neoproterozoic to Early Ordovician,Middle Ordovician to Middle Devonian,Late Devonian to Permian,Triassic,Jurassic to Cretaceous and Paleogene to *** western Tarim Basin was a rift basin in the Neoproterozoic to Early *** the Middle Ordovician to Middle Devonian,the basin consisted of a flexural depression in the south and a depression that changed from a rift depression to a flexural depression in the north during each period,i.e.,the Middle-Late Ordovician and the Silurian to Middle *** the Late Devonian to Permian,the basin was a depression basin early and then changed into a flexural basin late in each period,i.e.,the Late Devonian to Carboniferous and the *** the Triassic,the basin was a foreland basin,and from the Jurassic to Cretaceous,it was a downwarped *** the Paleogene,the basin became a rejuvenated foreland *** on two cross sections,we conclude that the extension and shortening in the profile reflect the tectonic evolution of the Tarim *** Tarim Basin has become a composite and superimposed sedimentary basin because of its long-term and complicated tectonic evolutionary history,highly rigid and stable basement and large size.

关键词： Western Tarim Basin Phanerozoic Structural evolution Composite and superimposed sedimentary basin

Dielectric properties of Simon poplar wood flour/polypropylene composite at oven-dry state

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Forestry Studies in China 2008年第4期10卷 265-269页

作者： wang Lei CAO jin-zhen wang yi College of Materials Science and Technology Beijing Forestry University Beijing 100083 E R. China

Interfacial compatibility is a crucial factor to the performance of wood-plastic composites （WPCs）. Yet, so far, the coupling mechanisms of WPC have not been completely understood. In order to further clarify the interfacial coupling mechanism, the dielectric constant and dielectric loss factor of Simon poplar wood flour/polypropylene composites without additives at different wood contents were measured at oven-dry state, and parameters and thermodynamic quantities of the relaxation process were also analyzed and calculated. Consequently, an obvious relaxation process based on the reorientation of methanol groups in amorphous region of wood cell wall was observed exactly that its dielectric loss factor peak decreased with the decreasing wood content within the measured range of 50%-100%. With the trend of dielectric relaxation strength, the two changing trends both revealed that the existence of polypropylene could hinder reorientation of methanol groups. Following the decreasing wood contents, the effect of the hindrance on the dielectric properties turned obvious gradually. It elucidated that introduction of polypropylene caused the quantities of hydrogen bonds formed between each methanol group and the groups around it change. The same conclusion could be drawn from the analysis of thermodynamic quantities during the dielectric relaxation progress.

关键词： Simon poplar wood flour/polypropylene composite wood content dielectric relaxation methanol group

Y-chromosomes from skeletal remains of Chinese Expeditionary Force offer a clue to their paternal relatives

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Science Bulletin 2016年第6期61卷 425-427页

作者： Shao-Qing Wen Xin-Zhu Tong Chi-Zao wang Pan-Xin Du jin-yi wang Jian-Xue Xiong Liang Chen Li jin Hui Li MOE Key Laboratory of Contemporary Anthropology Collaborative Innovation Center for Genetics and DevelopmentSchool of Life Sciences Fudan University School of Cultural Heritages Northwest University

Chinese Expeditionary Force(CEF)was one of the two Chinese military excursions outside of sovereign Chinese territory sent to repel Japanese forces occupying Burma during World War *** 1941,the World War II entered its darkest *** had been embroiled in a desperate struggle to resist the Japanese *** troops aiming at cutting the supply routes to China had left only one line of communication open for China to the West—the Yunnan-Burma Road in the southwest[1].To

关键词：中国 Y染色体第二次世界大战父系遗骸日本军队二战期间军事行动

Two new types of sandbars in channels of the modern Ganjiang Delta,Poyang Lake,China:Depositional characteristics and origin

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Journal of Palaeogeography 2017年第2期6卷 132-143页

作者： Zhen-Kui jin Bai-Shui Gao jin-yi wang Yan Li Liang Shi Kuan-Hong Yu Gui-Zai Li College of Geosciences China University of Petroleum(Beijing) College of Geosciences Yangtze University

Two new types of sandbars are found in distributary channels of the modern Ganjiang Delta,Poyang Lake,China,respectively named as branching-point bar(BPB) and merging-point bar(MPB).BPB is defined as sandbar formed at the branching point of a channel where one channel branches into *** is defined as sandbar formed at the merging point of two *** results from current velocity decrease at the branching ***,arrowhead-shaped and growing towards upstream through upstream accretion,can be divided into bar head,middle and *** head refers to the lower part of the bar below average low water level,submerges under water whether in rainy seasons or dry seasons,and no plants grow on *** middle refers to the middle part of the bar between average low and average high water levels,and sparse plants grow on *** tail refers to the upper part of the bar above average high water level,and plants grow densely on *** bar head to bar tail,sediment becomes finer and sorting degree becomes poorer;plant fossils increase in number,and silting-mud layers increase both in number and *** BPB shows a fining-upward *** can be classified into 3 types:baby BPB with only bar head,child BPB with bar head and middle,and adult BPB with bar head,middle and *** from the lower delta plain to upper delta plain,BPB becomes more and more *** a channel is suddenly abandoned,BPB at different stages may be *** is very similar to BPB in depositional characteristics,and main differences lie in its origin and growth *** of BPB and MPB has important implications in finding remaining oil in ***,geologists considered point bars on convex bank of meandering channels or longitudinal bars and transverse bars in the middle of braided channels as favorable locations for finding remaining *** study shows such locations as branching points and merging points of channels are also significant because BP

关键词： Branching-point bar Merging-point bar Distributary channel Ganjiang Delta Poyang Lake Remaining oil

Preliminary study of viscoelastic properties of MAPP-modified wood flour/polypropylene composites

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Forestry Studies in China 2010年第2期12卷 85-89页

作者： CAO jin-zhen wang yi XU Wei-yue wang Lei College of Materials Science and Technology Beijing Forestry University Beijing 100083 P. R. China

Viscoelastic properties of maleated polypropylene （MAPP）-modified wood flour/polypropylene composites （WPC） were investigated by both a compression stress relaxation method and dynamic mechanical analyses （DMA）. Three wood to polymer ratios （40：60, 60：40, and 80：20） and five MAPP loading levels （0, 1, 2, 4 and 8%） were used to study their effects on the viscoelastic prop- erties of MAPP-WPC. The results show that： 1） higher wood to polymer ratio corresponds to higher stress relaxation levels for unmodified WPC. The modification with MAPP has an obvious effect on the stress relaxation of MAPP-WPC at higher wood to polymer ratios （60：40 and 80：20）, but almost no effect at the 40：60 wood to polymer ratio. The optimal MAPP loading level for the wood to polymer ratio of 60：40 appears at 1%; 2） the storage modulus reaches its maximum at a MAPP loading level of 1% for wood to polymer ratios of 40：60 and 60：40, while for the 80：20 wood to polymer ratio, a higher storage modulus is observed at higher MAPP loading levels, which is quite consistent with the stress relaxation results. The results suggested that a suitable loading level of MAPP has a positive effect on the viscoelastic properties of WPC at higher wood to polymer ratios. Excessive MAPP loading would have resulted in adverse effects.

关键词： wood flour/polypropylene composite (WPC) maleated polypropylene (MAPP) viscoelastic properties stress relaxa-tion dynamic mechanical analysis (DMA)

Role of tumor-associated macrophages in common digestive system malignant tumors

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World Journal of Gastrointestinal Oncology 2023年第4期15卷 596-616页

作者： Yue Shen Jia-Xi Chen Ming Li Ze Xiang Jian Wu yi-jin wang Department of Dermatology Suzhou Municipal HospitalSuzhou 215008Jiangsu ProvinceChina School of Medicine Zhejiang UniversityHangzhou 310009Zhejiang ProvinceChina Department of Pathology Suzhou Municipal HospitalSuzhou 215008Jiangsu ProvinceChina Department of Clinical Laboratory Suzhou Municipal HospitalSuzhou 215008Jiangsu ProvinceChina School of Medicine Southern University of Science and TechnologyShenzhen 518055Guangdong ProvinceChina

Many digestive system malignant tumors are characterized by high incidence and mortality *** evidence has revealed that the tumor microenvironment(TME)is involved in cancer initiation and tumor ***-associated macrophages(TAMs)are a predominant constituent of the TME,and participate in the regulation of various biological behaviors and influence the prognosis of digestive system *** can be mainly classified into the antitumor M1 phenotype and protumor M2 *** latter especially are crucial drivers of tumor invasion,growth,angiogenesis,metastasis,immunosuppression,and resistance to *** are of importance in the occurrence,development,diagnosis,prognosis,and treatment of common digestive system malignant *** this review,we summarize the role of TAMs in common digestive system malignant tumors,including esophageal,gastric,colorectal,pancreatic and liver *** TAMs promote the development of tumors,and how they act as potential therapeutic targets and their clinical applications are also described.

关键词： Tumor-associated macrophages Digestive system malignant tumors Tumor development Therapeutic targets Clinical applications

Engineering Quantum Criticality for Quantum Dot Power Harvesting

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Chinese Physics Letters 2024年第2期41卷 14-25页

作者：王金义年磊磊吕京涛 School of Physics and Astronomy Yunnan UniversityKunming 650091China School of Physics Institute for Quantum Science and Engineeringand Wuhan National High Magnetic Field CenterHuazhong University of Science and TechnologyWuhan 430074China

Coupling of quantum-dot circuits to microwave photons enables us to investigate photon-assisted quantum ***,we revisit this typical circuit quantum electrodynamical setup by introducing the Kerr nonlinearity of *** exploiting quantum critical behavior,we propose a powerful scheme to control the power-harvesting efficiency in the microwave regime,where the driven-dissipative optical system acts as an energy *** drives electron transport against a load in the quantum-dot *** energy transfer and,consequently,the harvesting efficiency are enhanced near the critical *** the critical point moves towards to low input power,high efficiency within experimental parameters is *** results complement fundamental studies of photon-to-electron conversion at the nanoscale and provide practical guidance for designs of integrated photoelectric devices through quantum criticality.

关键词： quantum critical microwave