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Toward Improved Accuracy in Quasi-Static Elastography Using Deep Learning

Computer Modeling in Engineering & Sciences 2024年第4期139卷 911-935页

作者： Yue Mei Jianwei Deng Dongmei Zhao Changjiang Xiao Tianhang Wang Li Dong xuefeng zhu Department of Engineering Mechanics State Key Laboratory of Structural Analysis for Industrial EquipmentDalian University of TechnologyDalian116023China International Research Center for Computational Mechanics Dalian University of TechnologyDalian116023China DUT-BSU Joint Institute Dalian University of TechnologyDalian116023China Department of Automotive Engineering Tongji UniversityShanghai201804China *** SeattleWA98109USA School of Automotive Engineering Dalian University of TechnologyDalian116023China

Elastography is a non-invasive medical imaging technique to map the spatial variation of elastic properties of soft tissues.The quality of reconstruction results in elastography is highly sensitive to the noise induced by imaging measurements and processing.To address this issue,we propose a deep learning(DL)model based on conditional Generative Adversarial Networks(cGANs)to improve the quality of nonhomogeneous shear modulus reconstruction.To train this model,we generated a synthetic displacement field with finite element simulation under known nonhomogeneous shear modulus distribution.Both the simulated and experimental displacement fields are used to validate the proposed method.The reconstructed results demonstrate that the DL model with synthetic training data is able to improve the quality of the reconstruction compared with the well-established optimization method.Moreover,we emphasize that our DL model is only trained on synthetic data.This might provide a way to alleviate the challenge of obtaining clinical or experimental data in elastography.Overall,this work addresses several fatal issues in applying the DL technique into elastography,and the proposed method has shown great potential in improving the accuracy of the disease diagnosis in clinical medicine.

关键词： Nonhomogeneous elastic property distribution reconstruction deep learning finite element method inverse problem elastography conditional generative adversarial network

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Boosting the oxygen evolution reaction through migrating active sites from the bulk to surface of perovskite oxides

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Journal of Energy Chemistry 2022年第6期31卷 434-441,I0012页

作者： Zhengsen Wang Ziyi Hao Fang Shi Kaiyue zhu xuefeng zhu Weishen Yang State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina University of Chinese Academy of Sciences Beijing 100049China Department of Chemistry University of CaliforniaLos AngelesCA 90095United States

The oxygen evolution reaction (OER) dominates the efficiency of electrocatalytic water splitting owing to its sluggish kinetics.Perovskite oxides (ABO_(3)) have emerged as promising candidates to accelerate the OER process owing to their high intrinsic activities and tailorable properties.Fe ions in perovskite oxides have been proved to be a highly catalytic element for OER,while some Fe-based perovskites such as SrTi_(0.8)Fe_(0.2)O_(3-δ)(STF) and La_(0.66)Ti_(0.8)Fe_(0.2)O_(3-δ)(LTF) exhibit inferior OER activity.Yet the essential reason is still unclear and the effective method to promote the activity of such perovskite is also lacking.Herein,an in-situ exsolution strategy was proposed to boost the OER by migrating Fe from the bulk to the surface.Significantly enhanced OER activity was achieved on STF and LTF perovskites with surfacedecorated oxygen vacancies and Fe nanoparticles.In addition,theoretical calculation confirmed that the oxygen vacancies and Fe nanoparticle on surface could lower the overpotential of OER by facilitating the adsorption of OH^(-).From this study,migration of the active elements in perovskite is found to be an effective strategy to increase the quantity and activity of active sites,providing new insights and understanding for designing efficient OER catalysts.

关键词： Oxygen evolution reaction(OER) Perovskite oxides Oxygen vacancy Fe nanoparticles Migration of active site

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Ecofriendly Hydroxyalkyl Cellulose Additives for Efficient and Stable MAPbI_(3)-Based Inverted Perovskite Solar Cells

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Energy & Environmental Materials 2023年第5期6卷 251-259页

作者： xuefeng zhu Rui Lin Hao Gu Huichao Hu Zheng Liu Guichuan Xing Yibing Wu Xinhua Ouyang College of Material Engineering Fujian Agriculture and Forestry UniversityFuzhou 350002China Joint Key Laboratory of the Ministry of Education Institute of Applied Physics and Materials EngineeringUniversity of MacaoAvenida da UniversidadeTaipaMacao 999078China

Perovskite solar cells(PSCs)have been demonstrated to be one of the most promising technologies in the field of renewable energy.However,the presence of the defects in the perovskite films greatly limits the efficiency and the stability of the PSCs.The additive engineering is one of the most effective approaches to overcome this problem.Most of the successful additives are extracted from the petroleum-based materials,while the research on the biomass-based additives is still lagging behind.In this paper,two ecofriendly hydroxyalkyl cellulose additives,i.e.,hydroxyethyl cellulose(HEC)and hydroxylpropyl cellulose(HPC),are investigated on the performance of the MAPbl_(3)-based inverted PSCs.Due to the strong interaction between the hydroxyl groups of the cellulose and the divalent cations of the perovskite,these additives enhance the crystal grain orientation and significantly repair the defects of the perovskite films.Working as the additives,these two cellulose derivatives show a strong passivation ability,which significantly reduces the trap density and improves the optoelectronic feature of the PSCs.Compared with the average power conversion efficiency(PCE)of the control device(19.19%),an enhancement of~10%is achieved after the addition of HEC.The optimized device(PCE=21.25%)with a long-term stability(10:80 h,PCE=20.93%)is achieved by the incorporation of the HEC additives into the precursor solution.It is the best performance among the PSCs with the cellulose additives up to now.This research provides a novel choice to develop a cost-effective and renewable additive for the PSCs with high efficiency and excellent long-term stability.

关键词： additives hydroxyalkyl cellulose inverted perovskite solar cells MAPbl_(3)

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The soil Microbial Carbon Pump as a new concept for terrestrial carbon sequestration

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Science China Earth Sciences 2021年第4期64卷 545-558页

作者： Chao LIANG xuefeng zhu Institute of Applied Ecology Chinese Academy of SciencesShenyang 110016China

Soil is a huge terrestrial carbon pool, which has higher carbon storage than the sum of atmospheric and terrestrial vegetation carbon. Small fluctuations in soil carbon pool can affect regional carbon flux and global climate change. As soil organic carbon plays key roles in soil carbon storage and sequestration, studying its composition, sources and stability mechanism is a key to deeply understand the functions of terrestrial ecosystem and how it will respond to climate changes. The recently-proposed concept of soil Microbial Carbon Pump(MCP) emphasizes the importance of soil microbial anabolism and its contributions to soil carbon formation and stabilization, which can be applied for elucidating the source, formation and sequestration of soil organic carbon. This article elaborates MCP-mediated soil carbon sequestration mechanism and its influencing factors, as well as representative scientific questions we may explore with the soil MCP conceptual framework.

关键词： Soil Microbial Carbon Pump Entombing Effect Carbon cycling Soil microorganisms Soil organic carbon Microbial residues Amino sugars Soil fauna

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当代西方剧场建筑的伦理表演性

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文艺研究 2024年第1期 113-126页

作者：朱雪峰南京大学外国语学院

剧场建筑既是演出场所也是建筑艺术,作为剧场表演性的构成要素之一,它是具有重要社会功能的特定美学空间,因此有必要从特定时代的共同精神气质角度来剖析其伦理表演性。20世纪中叶至今,当代西方剧场建筑的理论与实践经历了伦理表演性的... 详细信息

剧场建筑既是演出场所也是建筑艺术,作为剧场表演性的构成要素之一,它是具有重要社会功能的特定美学空间,因此有必要从特定时代的共同精神气质角度来剖析其伦理表演性。20世纪中叶至今,当代西方剧场建筑的理论与实践经历了伦理表演性的嬗变。当代西方剧场建筑类型多样,有着自身的建筑史发展线索,它们和当代剧场与表演实践既有交织融合,也有对立疏离。剧场建筑伦理表演性的锋芒,逐渐从现代主义新建剧场“为创造而摧毁,或为赋能而创造”的创新,转向后现代改造剧场通过引用与重述对自律主体性的解构和在此基础上的主体性重建,以及全球化时代临时剧场建筑倾听他者、回应他者的漂移。当代欧美剧场建筑通过发挥剧场建筑的伦理表演性,为正在浮现的时代问题提供兼具艺术想象力和现实行动力的建筑新思路。

关键词：剧场建筑建筑史理论与实践艺术想象力表演实践表演性演出场所当代西方

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时间与责任:作为虚构家族自传的《利奥波德城》

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外国文学评论 2024年第1期 95-113页

作者：朱雪峰南京大学南京大学外国语学院

作为一个大屠杀受害者的后代,英国犹太裔剧作家汤姆·斯托帕德在最新剧作《利奥波德城》里首次深入反思了大屠杀与艺术的伦理关系问题。此剧以虚构家族自传的形式,在科学、哲学、艺术这三个相互交织的维度上探讨与大屠杀相关的时间与责... 详细信息

作为一个大屠杀受害者的后代,英国犹太裔剧作家汤姆·斯托帕德在最新剧作《利奥波德城》里首次深入反思了大屠杀与艺术的伦理关系问题。此剧以虚构家族自传的形式,在科学、哲学、艺术这三个相互交织的维度上探讨与大屠杀相关的时间与责任主题。剧作家追问大屠杀与现代文明的因果关联,以家族群像表达对失忆的自责,并通过艺术自省探索大屠杀之后艺术承担社会责任的可能性。虚构家族自传《利奥波德城》创造了一种超越自我的剧场时间动力系统,以列维纳斯伦理现象学意义上的剧场存在事件,激发观众对大屠杀历史的隔代见证和对未来的伦理思考。

关键词：汤姆·斯托帕德《利奥波德城》大屠杀时间责任

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Rational design of CO_(2)electroreduction cathode via in situ electrochemical phase transition

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Journal of Energy Chemistry 2022年第3期31卷 603-611,I0016页

作者： Shiqing Hu Huan Li Xue Dong Zhongwei Cao Bingjie Pang Liming Zhang Wenguang Yu Jianping Xiao xuefeng zhu Weishen Yang State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina University of Chinese Academy of Sciences Beijing 100049China Dalian National Laboratory for Clean Energy Chinese Academy of SciencesDalian 116023LiaoningChina

CO_(2)electroreduction reaction(CO_(2)RR),combined with solid oxide electrolysis cells(SOECs),is a feasible technology for the storage of renewable electric energy,while its development is limited by the catalytic activity and stability on cathodes.Here,a novel garnet oxide(Gd_(3)Fe_(5)O_(12))cathode is designed,where the garnet oxide is converted to perovskite oxide and iron via in situ electrochemical phase transition during CO_(2)electroreduction,resulting in high activity with Faradaic efficiency close to 100%and great stability over 1000 h galvanostatic test.A variety of experimental characterizations and density functional theory calculations indicate that in situ exsolved Fe clusters can effectively enhance the adsorption energies of intermediates and lowering the CO_(2)dissociation barriers.Microkinetic modelling confirms that CO_(2)RR goes through a dissociative adsorption mechanism and the electronic transfer for CO_(2)dissociation is the rate-determining step.

关键词： Carbon dioxide electroreduction Electrochemical phase transition Garnet oxides Perovskite oxides Iron nanoparticles

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Topological-skeleton controlled chirality expression of supramolecular hyperbranched and linear polymers

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Fundamental Research 2022年第3期2卷 422-428页

作者： Xin Song xuefeng zhu Hao Yao Weili Shang Cong Du Wensheng Lu Minghua Liu Wei Tian Shaanxi Key Laboratory of Macromolecular Science and Technology MOE Key Laboratory of Material Physics and Chemistry under Extraordinary ConditionsSchool of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’an 710072China Beijing National Laboratory for Molecular Sciences(BNLMS) Key Laboratory of ColloidInterface and Chemical ThermodynamicsInstitute of ChemistryChinese Academy of Sciences(CAS)ZhongGuanCun North First Street 2Beijing 100190China University of Chinese Academy of Sciences Beijing 100190China School of Civil Engineering Central South UniversityChangsha 410075China

The topology of polymers plays an essential role in their chemical,physical and biological properties.However,their effects on chirality-related functions remain unclear.Here,we reported the topology-controlled chirality expression in the chiral supramolecular system for the first time.Two topological supramolecular polymers,hy-perbranched(HP)and linear(LP)supramolecular polymers produced by the host-guest interactions of branched and linear monomers,respectively,exhibited completely different chirality expressions despite the same molecu-lar chirality of their monomers.Significantly,due to the branch points and strong steric hindrance existing in HP,cis-HP showed an enhanced and sign-inverted Cotton effect in the n-π^(∗)bands compared with cis-LP,as a result that the distinctive chirality induction and transfer were controlled by the topological skeletons.This topology-controlled chirality induction and transfer in the photoswitchable supramolecular polymers not only enables us to elucidate the in-depth effects of topology on the chiral expression in biopolymers but also inspires the design of chiroptical and bioinspired materials.

关键词： Supramolecular chirality Topological skeleton Supramolecular polymer Host-guest interaction Photoisomerization

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Electrochemical reduction of CO_2 in solid oxide electrolysis cells

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Journal of Energy Chemistry 2017年第4期26卷 593-601页

作者： Lixiao Zhang Shiqing Hu xuefeng zhu Weishen Yang State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of Sciences University of Chinese Academy of Sciences

The effort on electrochemical reduction of COto useful chemicals using the renewable energy to drive the process is growing fast recently. In this review, we introduce the recent progresses on the electrochemical reduction of COin solid oxide electrolysis cells（SOECs）. At high temperature, only CO is produced with high current densities and Faradic efficiency while the reactor is complicated and a better sealing technique is urgently needed. The typical electrolytes such as zirconia-based oxides, ceria-based oxides and lanthanum gallates-based oxides, anodes and cathodes are introduced in this review, and the cathode materials, such as conventional metal–ceramics（cermets）, mixed ionic and electronic conductors（MIECs） are discussed in detail. In the future, to gain more value-added products, the electrolyte, cathode and anode materials should be developed to allow SOECs to be operated at temperature range of 573–873 K. At those temperatures, SOECs may combine the advantages of the low temperature system and the high temperature system to produce various products with high current densities.

关键词： CO2 electrochemical reduction SOECs Ni–YSZ MIECs

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Porous carbon layers wrapped CoFe alloy for ultrastable Zn-Air batteries exceeding 20,000 charging-discharging cycles

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Journal of Energy Chemistry 2021年第10期30卷 327-335,I0010页

作者： Fang Shi Kaiyue zhu Xiaoke Li Erdong Wang xuefeng zhu Weishen Yang State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of Sciences457 Zhongshan RoadDalian 116023LiaoningChina University of Chinese Academy of Sciences Beijing 100049China Division of Full Cell and Battery Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina

Developing high active and stable bifunctional electrocatalysts towards oxygen reduction reaction(ORR)and oxygen evolution reaction(OER)is essential for the development of rechargeable Zn-air batteries.Herein,a facile strategy to synthesize the porous carbon layers wrapped CoFe alloy(C/CoFe)through the pyrolysis of a homogeneous mixture containing Co,Fe ions and N-doped carbon quantum dots(Ndoped CQDs)was reported.The prepared carbon layers with multi-level pore structures provides more active sites and optimizes the homogeneity of the electron and mass transport.In addition,the carbon layers,which is doped by Co/Fe/N atoms,is responsible for high ORR activity,while the CoFe alloy plays a vital role in OER performance.The as-synthesized catalyst exhibits an excellent bifunctionality for electrochemical oxygen reactions,which is comparable to the commercial Pt/C and IrO2 benchmarks.Owing to the carbon layers protects CoFe alloy nanoparticles from the harsh environment,the rechargeable Znair battery with the C/CoFe catalyst delivers excellent stability during 20,000 charging-discharging cycles.

关键词： Rechargeable Zn-air battery Oxygen reduction reaction Oxygen evolution reaction Carbon materials CoFe alloy

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