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Effect of Shot Peening on Surface Damage Evolution Behavior of Cu-19Ni Alloy

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Journal of Wuhan University of Technology(Materials Science) 2023年第1期38卷 212-221页

作者：朱旭军李磊 SHI Zhiming wei Liangyu tian Fuzheng College of Sciences Inner Mongolia University of TechnologyHohhot 010051China School of Materials Science and Engineering Inner Mongolia University of TechnologyHohhot 010051China

Shot peening is a surface modification technology with the metal surface nano machine(SNC),which can modify the surface microstructure and extend the fatigue life of Cu-19Ni alloy.The hardness,damage evolution and mechanical properties were investigated and characterized by scanning electron microscope(SEM),laser confocal microscope(LSM)and material surface performance tester(CFT).The results showed that the surface roughness and friction coefficient of Cu-19Ni alloy decreased with the increase of shot peening duration and diameter,while the microhardness and strength increased.Moreover,with the increase in shot peening duration and diameter,SEM observation showed that the fracture dimples became smaller,meanwhile,with the increase of small cleavage planes,shear tearing ridges and the thickness of the surface nano layer,the fracture mode gradually evolved from plastic to brittle fracture.The uniaxial tensile test of shot peened Cu-19Ni alloy was carried out by MTS testing machine combined with digital image correlation technology(DIC).The evolution of Cu-19Ni surface damage was analyzed,and the evolution equations describing the damage of large deformation zone and small deformation zone were established.The effect of shot peening on the damage evolution behavior of Cu-19Ni alloy was revealed.

关键词： Cu-19Ni alloy shot peening damage evolution mechanical properties digital image correlation

Robot-assisted Percutaneous Pedicle Screw Placement Using Three-dimensional Fluoroscopy： A Preliminary Clinical Study

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Chinese Medical Journal 2017年第13期130卷 1617-1618页

作者： Wei Tian Ming-Xing Fan Ya-Jun Liu Department of Spine Surgery Beijing Jishuitan Hospital Beijing 100035 China

Pedicle screw placement is an advanced posterior fixation technique that can provide patients with great biomechanical benefits. However, the morphology of the vertebrae is complex and it is very difficult to insert screws without penetrating the cortex. Thus, new techniques for improving the accuracy of pedicle screw placement and safety are required. Herein,

关键词： Navigation Pedicle Screw Spine Surgical Robot

Cavity-controlled methanol conversion over zeolite catalysts

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National Science Review 2023年第9期10卷 72-91页

作者： Wenna Zhang Shanfan Lin Yingxu wei Peng tian Mao Ye Zhongmin Liu National Engineering Research Center of Lower-Carbon Catalysis Technology Dalian National Laboratory for Clean Energy iChEM(Collaborative Innovation Center of Chemistry for Energy Materials) Dalian Institute of Chemical Physics Chinese Academy of Sciences Energy College University of Chinese Academy of Sciences State Key Laboratory of Catalysis Dalian Institute of Chemical Physics Chinese Academy of Sciences

The successful development and application in industry of methanol-to-olefins(MTO) process brought about an innovative and efficient route for olefin production via non-petrochemical resources and also attracted attention of C1 chemistry and zeolite catalysis.Molecular sieve catalysts with diversified microenvironments embedding unique channel/cavity structure and acid properties,exhibit demonstrable features and advantages in the shape-selective catalysis of MTO.Especially,shape-selective catalysis over8-MR and cavity-type zeolites with acidic supercage environment and narrow pore opening manifested special host-guest interaction between the zeolite catalyst and guest reactants,intermediates and products.This caused great differences in product distribution,catalyst deactivation and molecular diffusion,revealing the cavity-controlled methanol conversion over 8-MR and cavity-type zeolite catalyst.Furthermore,the dynamic and complicated cross-talk behaviors of catalyst material(coke)-reaction-diffusion over these types of zeolites determines the catalytic performance of the methanol conversion.In this review,we shed light on the cavity-controlled principle in the MTO reaction including cavity-controlled active intermediates formation,cavity-controlled reaction routes with the involvement of these intermediates in the complex reaction network,cavity-controlled catalyst deactivation and cavity-controlled diffusion.All these were exhibited by the MTO reaction performances and product selectivity over 8-MR and cavity-type zeolite catalysts.Advanced strategies inspired by the cavity-controlled principle were developed,providing great promise for the optimization and precise control of MTO process.

关键词： methanol-to-olefins cavity-controlled principle reaction intermediates and routes deactivation and diffusion shape-selective catalysis

Application and Effectiveness of Chinese Medicine in Regulating Immune Checkpoint Pathways

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Chinese Journal of Integrative Medicine 2023年第11期29卷 1045-1056页

作者： XIONG Luo-jie tian Yue-feng ZHAI Chun-tao LI wei College of Acupuncture Massage and RehabilitationHunan University of Chinese MedicineChangsha(410208)China Second Clinical College Shanxi University of Chinese MedicineJinzhongShanxi Province(030619)China

Immunotherapy targeting immune checkpoint molecules has emerged as a key approach in cancer treatment,representing the forefront of antitumor research.However,studies on immune checkpoint molecules have mainly focused on targeted therapies.Chinese medicine(CM)research as a complementary medicine has revealed that immune checkpoint molecules also undergo disease-specific changes in the context of autoimmune diseases.This review article presents a comprehensive analysis of CM studies on immune checkpoint molecules in the last 5 years,with a focus on their role in different diseases and treatment modalities.CM research predominantly utilizes oral administration of herbal plant extracts or acupuncture techniques,which stimulate the immune system by activating specific acupoints through temperature and needling.In this study,we analyzed the modulation and mechanisms of immune checkpoint molecules associated with different coinhibitory and costimulatory molecules,and reviewed the immune functions of related molecules and CM studies in treating autoimmune diseases and tumors.By summarizing the characteristics and research value of CM in regulating immune checkpoint molecules,this review aims to provide a useful reference for future studies in this field.

关键词： acupuncture herbal Immune

Application status and challenges of machine vision in plant factory—A review

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Information Processing in Agriculture 2022年第2期9卷 195-211页

作者： ZhiWei Tian wei Ma Qichang Yang Famin Duan Institute of Urban Agriculture Chinese Academy of Agricultural SciencesChengdu 610000PR China

Plant factories have a great potential for mitigating the contradiction between the world’sgrowing population and food scarcity. During the process of its automatic production,machine vision plays a significant role. This technique almost covers every production linkfrom raising seedlings, transplanting, management, and harvesting to fruit grading. To provide references and a starting point for those who are committed to studying this issue. Inthis paper, the application prospects of machine vision in plant factories were analyzed,and the present researches were summarized from the fields of plant growth monitoring,robot operation assistance, and fruit grading. The results found that although the existingmethods have solved some practical problems at low cost, high efficiency and precision,some challenges still are faced by machine vision. Firstly, the changing lighting, complexbackgrounds, and color similarity within plant different parts cause the commonly usedimage segmentation algorithms to fail. The shortage of standard agricultural datasets alsokeeps deep learning and unsupervised classification algorithms from making progress.Secondly, there are some theoretical knowledge gaps for machine vision application in aparticular environment of plant factories, which seriously contains its application effect.Thirdly, the lack of special image acquisition devices and supporting facilities resulted inpoor image quality. All these factors hinder machine vision application in plant factories.Nevertheless, it is still a powerful tool and irreplaceable at present. We believed that thistechnique would promote plant factory development greatly with more robust, efficient,and reliable algorithms are developed in the future.

关键词： Machine vision Agricultural automation Plant factory Remote detecting

Selective adsorption of tetracycline by ß-CD-immobilized sodium alginate aerogel coupled with ultrafiltration for reclaimed water

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CHINESE JOURNAL OF CHEMICAL ENGINEERING 2024年第4期68卷 27-34页

作者： Quan, Xi Zhang, Jun Yin, Linlin Zuo, wei tian, Yu Harbin Inst Technol Sch Environm State Key Lab Urban Water Resource & Environm SKLU Harbin 150090 Peoples R China

In this work, a novel composite material based on ss-cyclodextrin-immobilized sodium alginate aerogel (ss-CD/NaAlg) was developed utilizing cross-linker of epichlorohydrin and applied as an adsorbent to remove tetracycline antibiotics from reclaimed wastewater. A series of characterizations were utilized to confirm the successful synthesis of the adsorbent and this ss-CD/NaAlg presented a three-dimensional network at the nanoscale or microscale. Under optimal conditions (pH = 4, t = 8 h, ss-CD: NaAlg = 9, adsorbent dosage = 1.5 g$L-1), the maximum removal rate of ss-CD/NaAlg to tetracycline was 70%. The adsorption behavior of tetracycline on ss-CD/NaAlg conformed to the Freundlich isotherm model (R2 = 0.9977) and the pseudo-second-order kinetic model (R2 = 0.9993). Moreover, the adsorbent still removed 55.3% of tetracycline after five cycles. Specially, the adsorbent was integrated with ultrafiltration to adsorb tetracycline antibiotics from simulated reclaimed wastewater, and the removal rate of tetracycline reached 78.9% within 2 h. The existence of Cr (VI) had a negligible impact on tetracycline removal, while the presence of humic acid exhibited a promoting effect. The possible adsorption mechanisms were also elucidated through X-ray photoelectron spectroscopy and density functional theory analysis. In summary, ss-CD/NaAlg represents an environmentally friendly, efficient, and sustainable adsorbent for removing tetracycline antibiotics from reclaimed water. (c) 2024 The Chemical Industry and Engineering Society of China, and Chemical Industry Press Co., Ltd. All rights reserved.

关键词： CD/NaAlg aerogel Covalent grafting Tetracycline antibiotics Ultrafiltration Selective adsorption Reclaimed water REMOVAL

Symplectic Blowing Down in Dimension Six

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Acta Mathematica Sinica,English Series 2022年第10期38卷 1831-1855页

作者： tian-Jun LI Yong Bin RUAN wei Yi ZHANG School of Mathematics University of MinnesotaMinneapolisMN 55455USA Institute for Advanced Study in Mathematics East No.7 BuildingZhejiang University Zijingang CampusHangzhou 310058P.R.China Mathematics Institute University of WarwickCoventryCV47ALUK

We establish a blowing down criterion in the context of birational symplectic geometry in dimension 6.

关键词： Symplectic birational geometry symplectic blowing down

Germplasm resources of three wood plant species enriched with nervonic acid

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Plant Diversity 2022年第3期44卷 308-315页

作者： Xing He tian-Quan Lu Jiang-Ying Li Ping Mao Li Zhang Guo-wei Zheng Bo tian Key Laboratory of Sustainable Utilization of Tropical Plant Resources Xishuangbanna Tropical Botanical GardenChinese Academy of Sciences88 Xuefu RoadKunming650223China University of Chinese Academy of Sciences Beijing100049China Xinping Branch Yuxi Tobacco CompanyXinping653400China d Guangnan Forestry and Grassland Bureau Guangnan663300China Traditional Chinese Medicine College Yunnan University of Chinese MedicineKunming650500China Center of Economic Botany Core Botanical GardensChinese Academy of SciencesMenglunMenglaYunnan666303China

Nervonic acid(NA)is a very-long-chain monounsaturated fatty acid with pharmaceutical and nutraceutical functions that plays an important role in treating several neurological disorders.One major source of NA is plant seed oil.Here we report fatty acid profiles of seeds and germplasm diversity of six plant species,including three woody plants with high amounts of NA-enriched seed oil,Malania oleifera,Macaranga adenantha,and M.indica.M.oleifera had the largest seed(average 7.40 g single seed),highest oil content(58.71%),and highest NA level(42.22%).The germplasm diversity of M.oleifera is associated with its habitat but not elevation.Seeds of M.adenantha contained higher NA levels(28.41%)than M.indica(21.77%),but M.indica contained a significantly higher oil content(29.22%)and seed yield.M.adenantha germplasm varied among populations,with one population having seeds with high oil content(22.63%)and NA level(37.78%).Although M.indica grow naturally at a range of elevations,no significant differences were detected between M.indica populations.These results suggest that M.indica and M.oleifera have greater potential as a source of NA,which will contribute to constructing a germplasm resource nursery and establishing a selection and breeding program to improve the development of NA-enriched plants.

关键词： Nervonic acid Germplasm resource Malania oleifera Macaranga adenantha Macaranga indica Diversity

TiO2 ALD decorated CuO/BiVO4 p-n heterojunction for improved photoelectrochemical water splitting

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Journal of Materials Science & Technology 2019年第8期35卷 1740-1746页

作者： Linxing Meng Wei Tian Fangli Wu Fengren Cao Liang Li School of Physical Science and Technology Center for Energy Conversion Materials & Physics (CECMP)Jiangsu Key Laboratory of Thin FilmsSoochow University

Bismuth vanadate(BiVO4)is a promising photoanode material owing to the narrow bandgap,appropriate band position,and excellent resistance against photocorrosion,however,the performance of photoelectrochemical(PEC)water splitting is largely limited by the poor carrier separation and transport ability.To address these issues,for the first time,we fabricate BiVO4 film/CuO nanocone p-n junctions as photoanodes by combing a facile spin-coating process and water bath reaction.This structure strengthens the light harvesting and promotes the charge separation and transport ability.The surface defects states are passivated by coating conformally ultrathin TiO2 onto CuO surface through atomic layer deposition(ALD)technique.Benefiting from the favorable morphology,energy band,and surface treatment,the BiVO4/CuO/TiO2 heterojunction generates an improved photocurrent that is much higher than pure BiVO4.The detailed mechanism investigations indicate that the synergetic optimization of charge separation and injection efficiency in the bulk and surface of photoelectrodes can significantly improve the performance of PEC cells.

关键词： Heterojunction BiVO4 Photoelectrochemical Atomic layer deposition