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Graphdiyne(C_(n)H_(2n-2)based CuI-GDY/ZnAl LDH double S-scheme heterojunction proved with in situ XPS for efficient photocatalytic hydrogen production

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Journal of Materials Science & Technology 2023年第24期155卷 132-141页

作者： tian wang Zhiliang Jin School of Chemistry and Chemical Engineering Ningxia Key Laboratory of Solar Chemical Conversion TechnologyKey Laboratory for Chemical Engineering and TechnologyState Ethnic Affairs CommissionNorth Minzu UniversityYinchuan 750021China

The photocatalytic performance can be significantly improved by constructing suitable heterojunction photocatalysts.It is well known that graphdiyne possesses a unique conjugated carbon network nanostructure,which gives it ample active sites on its surface and facilitates the reduction of protons.In this study,a unique new double S-scheme heterojunction photocatalyst was constructed by simple self-assembly of GDY prepared via organic synthesis methods and ZnAl-LDH.According to the study,an internal electric field controlling the transfer direction of the electron hole is formed between the interface of CuI-GDY and ZnAl-LDH,which broadens the light absorption range of the catalyst and improves the redox ability of the photocatalytic system.CuI-GDY and ZnAl-LDH are tightly bound together,which helps to separate the photogenerated carriers while preserving the strong reduction electrons in the GDY conduction band and the strong oxidation holes in the ZnAl-LDH valence band so that they can fully participate in the redox reaction.The charge-transfer paths on the S-scheme heterojunction interface were analyzed by in situ irradiation XPS.This work provides an effective strategy for the construction of double S-scheme heterojunction photocatalysts.

关键词： Conjugated carbon network Graphdiyne S-scheme heterojunction Hydrogen evolution

Vibration induced transparency:Simulating an optomechanical system via the cavity QED setup with a movable atom

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Fundamental Research 2023年第1期3卷 50-56页

作者： Mingzhu Weng tian tian Zhihai wang Center for Quantum Sciences and School of Physics Northeast Normal UniversityChangchun 130024China School of Science Changchun UniversityChangchun 130022China

We simulate an optomechanical system via a cavity QED scenario with a movable atom and investigate its application in the tiny mass sensing.We find that the steady-state solution of the system exhibits a multiple stability behavior,which is similar to that in the optomechanical system.We explain this phenomenon by the opto-mechanical interaction term in the effective Hamiltonian.Due to the dressed states formed by the effective coupling between the vibration degree of the atom and the optical mode in the cavity,we observe a narrow transparent window in the output field.We utilize this vibration induced transparency phenomenon to perform the tiny mass sensing.We hope our study will broaden the application of the cavity QED system to quantum technologies.

关键词： Cavity QED Movable atom Opto-mechanical type interaction Vibration induced transparency Mass sensing

Reflection and operationalization of the common but differentiated responsibilities and respective capabilities principle in the transparency framework under the international climate change regime

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Advances in Climate Change Research 2018年第4期9卷 253-263页

作者： WANG Tian GAO Xiang National Center for Climate Change Strategy and International Cooperation Ministry of Ecology and Environment Beijing 100038 China Energy Research Institute National Development and Reform Commission Beijing 100038 China

“Common but differentiated responsibilities and respective capabilities”(CBDRRC) is the most significant guiding principle in the international climate change regime, created by the United Nations Framework Convention on Climate Change in 1992 and inherited by the Paris Agreement 24 years later. This paper examines the operationalization of the CBDRRC principle in one of the cornerstone rules of the regimedits transparency provisions, both in existing practice under the convention and possible evolvement in negotiations under the Paris Agreement, from the perspectives of both international rule-making and domestic implementation. The authors have found a continuous enhancement of the transparency framework since the 1990s, and gradual consolidation of a bifurcated system between developed and developing countries into a common one. The authors argue that the transparency framework, as part of the procedural rules, should be designed to facilitate transparent information sharing in accordance with substantive commitments under international climate change laws. Thus, it indirectly reflects historical responsibilities for climate change, while the framework should also be designed as feasible and reflective of the respective capabilities of nations. Finally, the evolution of the transparency framework will aim to enact common and enhanced provisions while differentiating between developed and developing countries in the near term, and greater transparency-related capacity-building for developing countries.

关键词： International climate change law UNFCCC Paris agreement Transparency Common but differentiated responsibilities and respective capabilities principle

Transformer-Based Deep Learning Network for Tooth Segmentation on Panoramic Radiographs

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Journal of Systems Science & Complexity 2023年第1期36卷 257-272页

作者： SHENG Chen wang Lin HUANG Zhenhuan WANG Tian GUO Yalin HOU Wenjie XU Laiqing wang Jiazhu YAN Xue Medical School of Chinese PLA Beijing 100853China Department of Stomatology the first Medical CentreChinese PLA General HospitalBeijing 100853China Department of Stomatology the First Medical CentreChinese PLA General HospitalBeijing 100853China Beihang University Beijing 100191China

Panoramic radiographs can assist dentist to quickly evaluate patients’overall oral health status.The accurate detection and localization of tooth tissue on panoramic radiographs is the first step to identify pathology,and also plays a key role in an automatic diagnosis system.However,the evaluation of panoramic radiographs depends on the clinical experience and knowledge of dentist,while the interpretation of panoramic radiographs might lead misdiagnosis.Therefore,it is of great significance to use artificial intelligence to segment teeth on panoramic radiographs.In this study,SWin-Unet,the transformer-based Ushaped encoder-decoder architecture with skip-connections,is introduced to perform panoramic radiograph segmentation.To well evaluate the tooth segmentation performance of SWin-Unet,the PLAGH-BH dataset is introduced for the research purpose.The performance is evaluated by F1 score,mean intersection and Union(IoU)and Acc,Compared with U-Net,Link-Net and FPN baselines,SWin-Unet performs much better in PLAGH-BH tooth segmentation dataset.These results indicate that SWin-Unet is more feasible on panoramic radiograph segmentation,and is valuable for the potential clinical application.

关键词： Deep convolutional neural network panoramic radiograph SWin-Unet Tooth segmentation

The origins of catalytic selectivity for the electrochemical conversion of carbon dioxide to methanol

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Nano Research 2024年第1期17卷 5-17页

作者： tian wang Yating wang Yuhang Li Chunzhong Li Key Laboratory for Ultrafine Materials of Ministry of Education Shanghai Engineering Research Center of Hierarchical NanomaterialsFrontiers Science Center for Materiobiology and Dynamic ChemistrySchool of Materials Science and EngineeringEast China University of Science&TechnologyShanghai 200237China School of Chemical Engineering East China University of Science&TechnologyShanghai 200237China

The electrocatalytic conversion of carbon dioxide(CO_(2))into useful fuels and chemical feedstocks is an emerging route to alleviate global warming and reduce reliance on fossil fuels.Methanol(CH_(3)OH),as one of the most significant and widely used liquid fuels that can be generated by CO_(2)reduction,is essential in the chemical industry.In this minireview,we unravel the origins of the selective formation of CH_(3)OH via CO_(2)reduction,including catalyst composition designs,local structure modulations,and electrolyte/catalyst interface regulations.Finally,the remaining challenges and perspectives for the CO_(2)-to-CH_(3)OH reduction are proposed.

关键词： methanol carbon dioxide(CO_(2))reduction reaction electrochemistry electrocatalyst catalyst-electrolyte interface

Treatment of immune dysfunction in intrauterine growth restriction piglets via supplementation with dimethylglycine sodium salt during the suckling period

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Animal Nutrition 2022年第4期11卷 215-227页

作者： Kaiwen Bai Luyi Jiang tian wang Wei wang School of Biological and Chemical Engineering Zhejiang University of Science and TechnologyHangzhouChina Institute of Dairy Science Ministry of Education Key Laboratory of Molecular Animal NutritionCollege of Animal SciencesZhejiang UniversityHangzhouChina College of Animal Science and Technology Nanjing Agricultural UniversityNanjingChina

This study aimed to investigate the mechanism of small intestinal immune dysfunction in intrauterine growth restriction(IUGR)newborn piglets and relieve this dysfunction via dimethylglycine sodium salt(DMG-Na)supplementation during the suckling period.Thirty sows(Duroc×[Landrace×Yorkshire])were selected,and 1 male newborn piglet with normal birth weight(NBW)and 1 male newborn piglet with IUGR were obtained from each sow.Among them,10 NBW and 10 IUGR newborns were euthanized without suckling.The other 20 NBW newborns were allocated to the group named NCON,which means NBW newborns fed a basic milk diet(BMD)(n=10),and the group named ND,which means NBW newborns fed BMD supplemented with 0.1%DMG-Na(n=10);the other 20 IUGR newborns were assigned to the group named ICON,which means IUGR newborns fed BMD(n=10),and the group named ID,which means IUGR newborns fed BMD supplemented with 0.1%DMG-Na(n=10).The newborns were fed BMD from 7 to 21 d of age and euthanized at 21 d of age to collect serum and small intestinal samples.The growth performance,small intestinal histological morphology and sub-organelle ultrastructure,serum immunoglobulin,small intestinal digestive enzyme activity,inflammatory cytokine level,and jejunum mRNA and protein expression of the toll-like receptor 4(TLR4)/nucleotide-binding oligomerization domain protein(NOD)/nuclear factor-k B(NF-k B)network deteriorated in the ICON group compared to that in the NCON group.The small intestinal histological morphology and suborganelle ultrastructure,serum immunoglobulin,small intestinal digestive enzyme activity,and inflammatory cytokine level improved(P<0.05)in the ID group compared to those in the ICON group.The jejunum mRNA and protein expression of the TLR4/NOD/NF-k B network improved(P<0.05)in the ID group compared to that in the ICON group.In conclusion,the activity of the TLR4/NOD/NF-k B pathway was inhibited in the IUGR newborns,which in turn led to their jejunum immune dysfunction and reduced their performance.By ingesting DMG-Na,the IUGR newborns activ

关键词： Intrauterine growth restriction Piglet Small intestine Immune dysfunction Dimethylglycine sodium salt

Numerical investigation on characteristics of interfacial wave of liquid film in gas-liquid two-phase flow using OpenFOAM

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Chinese Journal of Aeronautics 2024年第2期37卷 233-248页

作者： Xiaoqi MA Yueshe wang Jiaming tian State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong UniversityXi’an 710049China

Liquid film cooling as an advanced cooling technology is widely used in space vehicles.Stable operation of liquid film along the rocket combustion inner wall is crucial for thermal protection of rocket engines.The stability of liquid film is mainly determined by the characteristics of interfacial wave,which is rarely investigated right now.How to improve the stability of thin film has become a hot spot.In view of this,an advanced model based on the conventional Volume of Fluid(VOF)model is adopted to investigate the characteristics of interfacial wave in gas-liquid flow by using OpenFOAM,and the mechanism of formation and development of wave is revealed intuitively through numerical study.The effects from gas velocity,surface tension and dynamic viscosity of liquid(three factors)on the wave are studied respectively.It can be found that the gas velocity is critical to the formation and development of wave,and four modes of droplets generation are illustrated in this paper.Besides,a gas vortex near the gas-liquid interface can induce formation of wave easily,so changing the gas vortex state can regulate formation and development of wave.What’s more,the change rules of three factors influencing on the interfacial wave are obtained,and the surface tension has a negative effect on the formation and development of wave only when the surface tension coefficient is above the critical value,whereas the dynamic viscosity has a positive effect in this process.Lastly,the maximum height and maximum slope angle of wave will level off as the gas velocity increases.Meanwhile,the maximum slope angle of wave is usually no more than 38°,no matter what happens to the three factors.

关键词： Interfacial wave Gas-liquid Two-phase flow VOF model OpenFOAM

Integrated Inspection of QoM, QoP, and QoS for AOI Industries in Metaverses

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IEEE/CAA Journal of Automatica Sinica 2022年第12期9卷 2071-2078页

作者： Yutong wang Yonglin tian Jiangong wang Yansong Cao Shixing Li Bin tian IEEE The State Key Laboratory for Management and Control of Complex Systems Chinese Academy of SciencesBeijing 100190China Department of Engineering Science Faculty of Innovation EngineeringMacao University of Science and TechnologyMacao 999078China North Automatic Control Technology Institute in Taiyuan ShanxiChina Qingdao Academy of Intelligent Industries Shandong 266109China

With the rapid development of information technologies such as digital twin, extended reality, and blockchain,the hype around "metaverse" is increasing at astronomical speed. However, much attention has been paid to its entertainment and social functions. Considering the openness and interoperability of metaverses, the market of quality inspection promises explosive growth. In this paper, taking advantage of metaverses, we first propose the concept of Automated Quality Inspection(Auto QI), which performs integrated inspection covering the entire manufacturing process, including Quality of Materials, Quality of Manufacturing(Qo M), Quality of Products, Quality of Processes(Qo P), Quality of Systems, and Quality of Services(Qo S). Based on the scenarios engineering theory, we discuss how to perform interactions between metaverses and the physical world for virtual design instruction and physical validation feedback. Then we introduce a bottomup inspection device development workflow with productivity tools offered by metaverses, making development more effective and efficient than ever. As the core of quality inspection,we propose Quality Transformers to complete detection task,while federated learning is integrated to regulate data sharing.In summary, we point out the development directions of quality inspection under metaverse tide.

关键词： Automated Optical Inspection Metaverses Quality Inspection Transformers

On Subsonic and Subsonic-Sonic Flows with General Conservatives Force in Exterior Domains

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Acta Mathematicae Applicatae Sinica 2023年第1期39卷 3-16页

作者： Xumin GU tian-Yi wang Department of Mathematics Shanghai University of Finance and EconomicsShanghai 200433China Department of Mathematics School of ScienceWuhan University of TechnologyWuhan 430070China The Institute of Mathematical Sciences the Chinese University of Hong KongShatinN.T.Hong Kong Gran Sasso Science Institute viale Francesco Crispi767100 L'AquilaItaly

In this paper, we study the irrotational subsonic and subsonic-sonic fows with general conservative forces in the exterior domains. The conservative forces indicate the new Bernoulli law naturally. For the subsonic case, we introduce a modified cut-off system depending on the conservative forces which needs the varied Bers skill, and construct the solution by the new variational formula. Moreover, comparing with previous results, our result extends the pressure-density relation to the general case. Afterwards we obtain the subsonic-sonic limit solution by taking the extract subsonic solutions as the approximate sequences.

关键词： steady fow homentropic irrotation subsonic fow subsonic-sonic limit