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Journal of Wuhan University of Technology(Materials Science) 2023年第2期38卷 451-454页

作者： WANG Tao Yu FU Changqing Oilfield Company Oil Prouduction Plant No.8 CNPCChongqing710018China Shanghai Keyan Energy Technology Limited Company Shanghai202150China

Effects of nucleation sites and diffusivity enhancement of chromium on reverted transformation of AISI 304 stainless steel during annealing process were investigated.Dynamics calculation revealed that the reverted transformation of strain-inducedα’-martensite→γaustenite could were closely associated with active nucleation sites and diffusivity enhancement of chromium in nanocrystallineα’-martensite.The experimental data and the results were in accordance with 2-grain austenite/α’-martensite junctions calculated theoretically,which could result from high chromium diffusion rate in nanocrystallineα’-martensite.In addition,low temperature is not conducive to reversed transformation,while high temperature and long annealing time will lead to inhomogeneous grain size distribution.

关键词： austenitic stainless steel anneal diffusion phase transformation strain-inducedα′-martensite

Effect of relative humidity on the desulfurization performance of calcium-based desulfurizer

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Journal of Environmental Sciences 2024年第4期138卷 179-188页

作者： Juan Lǖ Yu FU Haiyan yu HuanWang Zhe Wang Haiyan Chen School of Environment and Resource Southwest University of Science and TechnologyMianyang 621010China Guangyuan Emergency Management bureau Guangyuan 628000China

Low desulfurization efficiency impedes the wide application of dry desulfurization technology,which is a low-cost and simple process,and one significant solution is the development and manufacture of high-performance desulfurizers.In this study,firstly,a steam jet mill was used to digest quicklime;then,we utilized numerical simulation to study the flow field distribution and analyze the driving factors of quicklime digestion;and lastly,the desulfurization performance of the desulfurizer was evaluated under different relative humidities.The results show that the desulfurizer prepared via the steam jet mill had better apparent activity than traditional desulfurizers.Also,the entire jet flow field of the steam jet mill is in a supersonic and highly turbulent flow state,with high crushing intensity and good particle acceleration performance.Sufficient contact with the nascent surface maximizes the formation of slaked lime.The experiments demonstrated that the operating time with 100%desulfurization efficiency and the“break-through”time for the desulfurizer prepared via the steam jet mill is longer than that of traditional desulfurizers,and has significant advantages,especially at low flue gas relative humidity.Compared with traditional desulfurizers,the desulfurizer prepared via steam jet mill expands the range of acceptable flue gas temperature,and the failure temperature is 1.625 times that of traditional desulfurizers.This work breaks through the technical bottleneck of low dry desulfurization efficiency,which is an important step in pushing forward the application of dry desulfurization.

关键词： Dry desulfurization Relative humidity Desulfurization efficiency High-efficiency desulfurizer Quicklime digestion

Willis covered stent in the treatment of a recurrent blood blister-like aneurysm after pipeline implementation:A case report

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Journal of Interventional Medicine 2023年第2期6卷 96-98页

作者： Yu FU Feng Fan Jing Li Sheng Guan Department of Neurointervention Radiology The First Affiliated Hospital of Zhengzhou UniversityZhengzhouChina Henan Neurointerventional Engineering Research Center China

Blood blister-like aneurysms(BBAs)are fragile and difficult to treat.However,the optimal treatment has yet to be determined.Pipeline embolization devices and Willis covered stent implementation are still controversial strategies for treating BBA.Herein,we report a case of recurrent BBA successfully treated with a Willis covered stent.A long-term follow-up angiography after the procedure indicated complete occlusion of the aneurysm.This case demonstrates the safety and efficacy of applying the Wills cover stent in the treatment of recurrent BBA after Pipeline implantation.

关键词： Blood blister-like aneurysm Endovascular therapy Pipeline embolization device Willis covered stent

Forest type identification by random forest classification combined with SPOT and multitemporal SAR data

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Journal of Forestry Research 2018年第5期29卷 1407-1414页

作者： Ying yu Mingze Li Yu FU School of Forestry Northeast Forestry University

We developed a forest type classification technology for the Daxing＇an Mountains of northeast China using multisource remote sensing data.A SPOT-5 image and two temporal images of RADARSAT-2 full-polarization SAR were used to identify forest types in the Pangu Forest Farm of the Daxing＇an Mountains.Forest types were identified using random forest（RF） classification with the following data combination types： SPOT-5 alone,SPOT-5 and SAR images in August or November,and SPOT-5 and two temporal SAR images.We identified many forest types using a combination of multitemporal SAR and SPOT-5 images,including Betula platyphylla,Larix gmelinii,Pinus sylvestris and Picea koraiensis forests.The accuracy of classification exceeded 88% and improved by 12% when compared to the classification results obtained using SPOT data alone.RF classification using a combination of multisource remote sensing data improved classification accuracy compared to that achieved using single-source remote sensing data.

关键词： Random forest classification Multitemporal Multisource remote sensing data Polarization decomposition

Non-contact optical dynamic measurements at different ranges:a review

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Acta Mechanica Sinica 2021年第4期37卷 537-553,I0001页

作者： Yu FU Yang Shang Wenxin Hu Bin Li Qifeng yu Shenzhen Key Laboratory of Intelligent Optical Measurement and Detection Shenzhen UniversityShenzhen 518060China Hunan Provincial Key Laboratory of Image Measurement and Vision Navigation College of Aerospace Science and EngineeringNational University of Defense TechnologyChangsha 410073China

Optical dynamic measurements are widely used for non-contact vibration,continuous deformation,or moving objects.Various measurement techniques were developed for different deformation amplitudes.This paper reviews three types of technique for different measurement ranges:interferometric techniques for deformation or vibration(nanometer to submillimeter amplitude)whose measurement accuracies rely on phase extraction of interferometric signal;imaging based techniques for deformation or vibration(micrometer to centimeter amplitude)with the aid of moire,structured light,and man-made speckles,whose sensitivities is from 1/100 to 1/10 pixel;and videometrics for large deformation or movement detection(greater than centimeter amplitude).Many research groups have improved measurement capabilities for these three techniques to meet particular industrial application requirements.

关键词： Vibration measurement Laser interferometry Digital image correlation High-speed imaging Videometrics

Ecological Assessment of Oxygen Balance:A Case Study of China’s Natural Oxygen Bars

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Journal of Meteorological Research 2023年第3期37卷 404-416页

作者： Hao GAO Xiuzhen HAN Xiurong WANG Yu FU Chen MIAO Key Laboratory of Radiometric Calibration and Validation for Environmental Satellites National Satellite Meteorological Centre(National Centre for Space Weather)/CMA Innovation Centre for Fengyun Meteorological Satellites(FYSIC)China Meteorological Administration(CMA)Beijing 100081 Public Meteorological Service Centre China Meteorological AdministrationBeijing 100081 Carbon Neutrality Research Center Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029 National Remote Sensing Center of China Beijing 100036

Ecological assessment plays a vital role in sustainable development of the environment,and thus exploration of specific and integrated ecological assessment methods has become a critical task.In this study,based on the concept of oxygen balance and by accommodating both natural factors and socioeconomic elements,we establish an oxygen(O_(2))balance index(OBI),i.e.,the ratio of the O_(2)production from the ecosystem to the O_(2)consumption by human behavior,based on the net primary productivity(NPP),fuel consumption,gross domestic production(GDP),population data,and so on.The results show that the spatial distributions of OBI in China are intimately correlated to the regional vegetation and socioeconomic development.The estimated OBI values are then validated by statistical data from 27 counties in China,and it is found that the OBI reflects the ecological environment status well.Moreover,the average OBI values derived from 190 natural oxygen bars in China reveal extreme imbalance between O_(2)production and consumption in highly developed regions,especially in the cities,in contrast to good O_(2)balance in areas with high-quality ecological status and less industrialization.The findings from this study have quantitatively captured the regional ecological quality,providing guidance for sustainable natural and socioeconomic developments in local areas of China.

关键词： oxygen balance index(OBI) ecological environment remote sensing China’s natural oxygen bars meteorological satellites

Therapeutic strategies for the costimulatory molecule OX40 in T-cell-mediated immunity

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Acta Pharmaceutica Sinica B 2020年第3期10卷 414-433页

作者： Yu FU Qing Lin Zhirong Zhang Ling Zhang Key Laboratory of Drug Targeting and Drug Delivery System of the Education Ministry Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial TechnologyCollege of Polymer Science and EngineeringWest China School of PharmacySichuan UniversityChengdu 610064China Department of Pharmacology Yale University School of MedicineNew HavenCT 06510USA

The T cell co-stimulatory molecule OX40 and its cognate ligand OX40 L have attracted broad research interest as a therapeutic target in T cell-mediated diseases.Accumulating preclinical evidence highlights the therapeutic efficacy of both agonist and blockade of the OX40-OX40 L interaction.Despite this progress,many questions about the immuno-modulator roles of OX40 on T cell function remain unanswered.In this review we summarize the impact of the OX40-OX40 L interaction on T cell subsets,including Th1,Th2,Th9,Th17,Th22,Treg,Tfh,and CD8+T cells,to gain a comprehensive understanding of anti-OX40 mAb-based therapies.The potential therapeutic application of the OX40-OX40 L interaction in autoimmunity diseases and cancer immunotherapy are further discussed;OX40-OX40 L blockade may ameliorate autoantigen-specific T cell responses and reduce immune activity in autoimmunity diseases.We also explore the rationale of targeting OX40-OX40 L interactions in cancer immunotherapy.Ligation of OX40 with targeted agonist anti-OX40 mAbs conveys activating signals to T cells.When combined with other therapeutic treatments,such as anti-PD-1 or anti-CTLA-4 blockade,cytokines,chemotherapy,or radiotherapy,the anti-tumor activity of agonist anti-OX40 treatment will be further enhanced.These data collectively suggest great potential for OX40-mediated therapies.

关键词： OX40 CD4^+ CD8^+ Treg Autoimmunity diseases Cancer immunotherapy

Dependence of mechanical behavior on grain size of metastable Ti–Nb–O titanium alloy

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Progress in Natural Science:Materials International 2022年第1期32卷 63-71页

作者： Junshuai Wang Wenlong Xiao Yu FU Lei Ren Chaoli Ma Key Laboratory of Aerospace Advanced Materials and Performance of Ministry of Education School of Materials Science and Engineering Beihang University yunnan Innovation Institute of Beihang University

Cold-rolled metastable β-type Ti–38Nb-0.2O alloy was subjected to annealing treatment to obtain different precipitates and grain sizes. The influence of annealing on microstructure and mechanical properties was investigated. The alloy annealed at 673 K or 773 K exhibited a single-stage yielding with high strength and low uniform elongation, due to the residual work hardening and the precipitation of ω or α phases. The alloy annealed at above873 K exhibited an obvious double yielding behavior resulting from the stress-induced martensitic transformation. The grain growth kinetics of single β phase alloy is sensitive to temperature, and it is suggested that the existence of oxygen decreases the grain growth exponent and increases the required activation energy for grain growth. The critical stress for slip decreased monotonously with the increase of grain size, following the classic Hall-Petch relationship. However, the critical stress for martensitic transformation decreased to a minimum and then increased again, as the grain size increased. The results are worth for design of the heat-treatment parameters of the Ti–38Nb-0.2O alloy for engineering applications.

关键词： Titanium alloy Grain growth kinetics Grain size Mechanical behavior Stress-induced martensite

On-line spheroidization process of medium-carbon low-alloyed cold heading steel

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International Journal of Minerals,Metallurgy and Materials 2014年第1期21卷 26-35页

作者： Yu FU Hao yu Pan Tao School of Materials Science and Engineering University of Science and Technology Beijing

Conventionally manufactured 35CrMo cold heading steel must undergo spheroidization annealing before the cold heading process In this paper, different types of deformation processes with various controlled cooling periods were operated to achieve on-line spheroidal cementite using the Gleeble-3500 simulation technique. According to the measured dynamic ferrite transformation temperature （Ad3）, the deformation could be divided into two types： low temperature deformation at 810 and 780℃; ＂deformation-induced ferrite transformation＂（DIFT） deformation at 750 and 720℃. Compared with the low temperature deformation, the DIFT deformation followed by accelerated cooling to 680℃ is beneficial for the formation of spheroidal cementite. Samples subjected to both the low-temperature deformation and DIFT deformation can obtain granular bainite by accelerated cooling to 640℃; the latter may contribute to the formation of a fine dispersion of secondary constituents. Granular bainite can transform into globular pearlite rapidly during subcritical annealing, and the more the disperse phase, the more homogeneously distributed globular cementite can be obtained.

关键词： steel heat treatment cold heading spheroidization globular cementite subcritical annealing

New speckle pattern interferometry for precise in situ deformation measurements

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Chinese Optics Letters 2024年第1期22卷 34-40页

作者：章如月 Yu FU 缪泓 CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Modern MechanicsUniversity of Science and Technology of ChinaHefei 230027China Shenzhen Key Laboratory of Intelligent Optical Measurement and Detection College of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China

A new electronic speckle pattern interferometry method is proposed to realize in situ deformation measurements.The feature of the method is the combination of a high-speed camera and multiple laser Doppler vibrometers(LDVs)for synchronous measurements.The high-speed camera is used to record and select effective interferograms,while the LDVs are used to measure the rigid body displacement caused by vibrations.A series of effective interferograms with known shifted phase values are obtained to calculate the deformation phase.The experimental results show that the method performs well in measuring static and dynamic deformations with high accuracy in vibrating environments.

关键词： speckle pattern interferometry laser Doppler vibrometers in situ deformation measurements