检索结果-内蒙古大学图书馆

SSRN 2023年

作者： Zhu, Xinyang Chen, Ronghua Wang, Jinshun Niu, Yuhang Wu, Yingwei Zhang, Dalin Tian, Wenxi Qiu, Suizheng Su, Guanghui School of Nuclear Science and Technology Shaanxi Key Laboratory of Advanced Nuclear Energy and Technology State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an710049 China

As one of the Gen IV advanced reactors, liquid metal reactor(LMR) holds promising prospects for its high fuel efficiency and excellent inherent safety performance. Owing to its complex working conditions and ultra-high operating temperature, a thermal-hydraulic analysis of the reactor core is gradually playing a bigger role in recent years. Therefore, a subchannel code FLARE for LMRs is developed within the MOOSE ***, a hybrid discretization approach involving DG and FEM as well as the JFNK method are employed to solve the equations in a fully-coupled way. To validate the computational accuracy and convergence of FLARE code, comparisons between the calculation values of FLARE, those of other programs and the experimental data are performed using 7-pin, 19-pin and 37-pin assembly experiments. The computational results indicate a good agreement between FLARE, experimental values, and other programs. In conclusion, FLARE code possesses the capability to accurately analyze LMR core. © 2023, The Authors. All rights reserved.

关键词： Reactor cores

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IDP-PGFE: An Interpretable Disruption Predictor based on Physics-Guided Feature Extraction

arXiv

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arXiv 2022年

作者： Shen, Chengshuo Zheng, Wei Ding, Yonghua Ai, Xinkun Xue, Fengming Zhong, Yu Wang, Nengchao Gao, Li Chen, Zhipeng Yang, Zhoujun Chen, Zhongyong Pan, Yuan International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China

Disruption prediction has made rapid progress in recent years, especially in machine learning (ML)-based methods. If a disruption prediction model can be interpreted, it can tell why certain samples are classified as disruption precursors. This allows us to tell the types of incoming disruption for disruption avoidance and gives us insight into the mechanism of disruption. This paper presents a disruption predictor called Interpretable Disruption Predictor based on Physics-Guided Feature Extraction (IDP-PGFE) and its results on J-TEXT experiment data. The prediction performance of IDP-PGFE with physics-guided features is effectively improved (TPR = 97.27%, FPR = 5.45%, AUC = 0.98) compared to the models with raw signal input. The validity of the interpretation results is ensured by the high performance of the model. The interpretability study using an attribution technique provides an understanding of J-TEXT disruption and conforms to our prior comprehension of disruption. Furthermore, IDP-PGFE gives a possible mean on inferring the underlying cause of the disruption and how interventions affect the disruption process in J-TEXT. The interpretation results and the experimental phenomenon have a high degree of conformity. The interpretation results also gives a possible experimental analysis direction that the RMPs delays the density limit disruption by affecting both the MHD instabilities and the radiation profile. PGFE could also reduce the data requirement of IDP-PGFE to 10% of the training data required to train a model on raw signals. This made it possible to be transferred to the next-generation tokamaks, which cannot provide large amounts of data. Therefore, IDP-PGFE is an effective approach to exploring disruption mechanisms and transferring disruption prediction models to future tokamaks. Copyright © 2022, The Authors. All rights reserved.

关键词： Tokamak devices

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Immune Defense: A Novel Adversarial Defense Mechanism for Preventing the Generation of Adversarial Examples

arXiv

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arXiv 2023年

作者： Wang, Jinwei Wu, Hao Wang, Haihua Zhang, Jiawei Luo, Xiangyang Ma, Bin Nanjing University of Information Science and Technology China State Key Laboratory of Mathematical Engineering and Advanced Computing China Qilu University of Technology China

The vulnerability of Deep Neural Networks (DNNs) to adversarial examples has been confirmed. Existing adversarial defenses primarily aim at preventing adversarial examples from attacking DNNs successfully, rather than preventing their generation. If the generation of adversarial examples is unregulated, images within reach are no longer secure and pose a threat to non-robust DNNs. Although gradient obfuscation attempts to address this issue, it has been shown to be circumventable. Therefore, we propose a novel adversarial defense mechanism, which is referred to as immune defense and is the example-based pre-defense. This mechanism applies carefully designed quasi-imperceptible perturbations to the raw images to prevent the generation of adversarial examples for the raw images, and thereby protecting both images and DNNs. These perturbed images are referred to as Immune Examples (IEs). In the white-box immune defense, we provide a gradient-based and an optimization-based approach, respectively. Additionally, the more complex black-box immune defense is taken into consideration. We propose Masked Gradient Sign Descent (MGSD) to reduce approximation error and stabilize the update to improve the transferability of IEs and thereby ensure their effectiveness against black-box adversarial attacks. The experimental results demonstrate that the optimization-based approach has superior performance and better visual quality in white-box immune defense. In contrast, the gradient-based approach has stronger transferability and the proposed MGSD significantly improve the transferability of baselines. Copyright © 2023, The Authors. All rights reserved.

关键词： Deep neural networks

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Mitochondrial flashes are interlinked with adaptive thermogenesis in brown adipocytes

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hLife 2024年第4期2卷 179-188页

作者： Xinyu Chen Huwatibieke Bahetiyaer Xuejiao Song Zuzhi Jiang Wenfeng Qi Weizheng Gao Lin Zhang Jue Zhang Heping Cheng Xianhua Wang State Key Laboratory of Membrane Biology Institute of Molecular MedicineCollege of Future TechnologyPeking UniversityBeijingChina Academy for Advanced Interdisciplinary Studies Peking UniversityBeijingChina College of Engineering Peking UniversityBeijingChina Research Unit of Mitochondria in Brain Diseases Chinese Academy of Medical SciencesPKU-Nanjing Institute of Translational MedicineJiangsuChina

Mitochondrial flash(mitoflash)is the electrochemical excitation of a single mitochondrion and plays diverse signaling roles in a variety of *** the viewpoint of bioenergetics,it represents the transient uncoupling of mitochondrial respiration from ATP *** adipose tissue(BAT)produces heat,primarily via mitochondrial uncoupled ***,we aim to illustrate the mitoflash activity in BAT *** show that BAT mitochondria undergo stochastic and intermittent mitoflashes at the levels of isolated mitochondria,cultured brown adipocytes,and even intact BAT.A BAT mitoflash contains multiple signals,including transient depolarization of mitochondrial membrane potential,transient matrix alkalization,and bursting production of reactive oxygen ***,thermogenic activation by b3-adrenergic stimulation dramatically augments mitoflash incidence,with mild effects on its unitary *** of the thermogenic uncoupling protein 1(UCP1)showed little effect on mitoflash biogenesis during heat ***,our results suggest that mitoflash might constitute an elemental signaling activity of mitochondria to regulate BAT thermogenesis.

关键词： mitochondrial flash(mitoflash) mitochondria thermogenesis brown adipocyte

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Micro-scale opto-thermo-mechanical actuation in the dry adhesive regime

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Light(Science & Applications) 2021年第10期10卷 1905-1914页

作者： Weiwei Tang Wei Lyu Jinsheng Lu Fengjiang Liu Jiyong Wang Wei Yan Min Qiu Key Laboratory of 3D Micro/Nano Fabrication and Characterization of Zhejiang Province School of EngineeringWestlake University18 Shilongshan RoadHangzhou 310024 Zhejiang ProvinceChina Institute of Advanced Technology Westlake Institute for Advanced Study18 Shilongshan RoadHangzhou 310024 Zhejiang ProvinceChina State Key Laboratory of Modern Optical Instrumentation College of Optical Science and EngineeringZhejiang UniversityHangzhou 310027China

Realizing optical manipulation of microscopic objects is crucial in the research fields of life science,condensed matter physics,and physical *** non-liquid environments,this task is commonly regarded as difficult due to strong adhesive surface force(~µN)attached to solid interfaces that makes tiny optical driven force(~pN)***,by recognizing the microscopic interaction mechanism between friction force—the parallel component of surface force on a contact surface—and thermoelastic waves induced by pulsed optical absorption,we establish a general principle enabling the actuation of micro-objects on dry frictional surfaces based on the opto-thermo-mechanical ***,we predict that nanosecond pulsed optical absorption with mW-scale peak power is sufficient to tameµN-scale friction ***,we demonstrate the two-dimensional spiral motion of gold plates on micro-fibers driven by nanosecond laser pulses,and reveal the rules of motion *** results pave the way for the future development of micro-scale actuators in non-liquid environments.

关键词： friction regime absorption

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Balancing κ-formation and γ-recrystallization towards exceptional mechanical properties in a NiCoV0.9 medium entropy alloy

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Intermetallics 2025年 179卷

作者： Zhang, Yuxin He, Junyang Cai, Weijin Li, Na Chen, Zipan Xu, Xiangqi Chen, Yang Qi, Zhixiang Zheng, Gong Wei, Daixiu Tan, Xinrong Song, Min State Key Laboratory of Powder Metallurgy Central South University Changsha410083 China School of Mechanical Engineering Tongling University Tongling244061 China Key Laboratory of Construction Hydraulic Robots of Anhui Higher Education Institutes Tongling University Tongling244061 China Jiangsu Belight Laboratory State Key Laboratory of Advanced Casting Technologies University of Science and Technology Nanjing210094 China Hunan University of Science and Technology Xiangtan411201 China

In this work, by lowering the V amount, two thermodynamic processes, i.e., κ-formation and γ-recrystallization, are near-concurrently activated in a NiCoV0.9 medium entropy alloy (MEA) during 900 °C annealing. The NiCoV0.9 MEA with only 2 min annealing inherits the high strength from the cold-rolling structure while regains apparent work-hardening, endowing the alloy at this state with excellent strength-ductility synergy. By utilizing correlated observation methods, it is found that in the very beginning of annealing, γ-recrystallization occurs closely prior to κ transformation, which in turn enables elemental redistribution needed for κ growth. Further in-situ synchrotron high-energy X-ray diffraction reveals the synchronous onset of plastic deformation in both κ and γ, suggesting the good deformability of κ regardless of its hard nature. With prolonged annealing at 900 °C, the yield strength drops sharply yet the ductility is not further enhanced. This is likely due to the fast increment in both size and volume fraction of the κ phase that significantly raises the cracking sensitivity. © 2025 Elsevier Ltd

关键词： Annealing

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Effects of zero and reversed magnetic shear on resistive wall modes in a limiter tokamak plasma

arXiv

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arXiv 2024年

作者： Wan, Sui Zhu, Ping Li, Haolong Han, Rui State Key Laboratory of Advanced Electromagnetic Technology International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China Department of Nuclear Engineering and Engineering Physics University of Wisconsin-Madison MadisonWI53706 United States College of Physics and Optoelectronic Engineering Shenzhen University Shenzhen518060 China CAS Key Laboratory of Geospace Environment Department of Engineering and Applied Physics University of Science and Technology of China Hefei230026 China

advanced tokamak scenarios often feature equilibriums with zero and reversed magnetic shear. To isolate and investigate their impacts on the resistive wall mode (RWM) instability analytically, we construct a series of cylindrical limiter equilibriums with reversed magnetic shear in the core and zero magnetic shear towards plasma edge, as a prototype of the configurations in advanced tokamak scenarios. Uniform plasma pressure is assumed, so that we can focus our analysis on the current-driven RWMs. Based on the reduced ideal MHD equations, analytical solutions for the n = 1 resistive wall mode are obtained, which indicate that increasing the reversal of magnetic shear in the core region enhances the RWM instability, whereas the widened region of zero shear near edge leads to lower growth rate of RWM, except when the q value with zero magnetic shear approaches rational values. On the other hand, enhanced positive shear at plasma edge is found to be stabilizing on RWM. NIMROD calculation results confirm these analytical findings. Copyright © 2024, The Authors. All rights reserved.

关键词： Magnetoplasma

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2D CoOOH Sheet-Encapsulated Ni2P into Tubular Arrays Realizing 1000 mA cm^-2-Level-Current-Density Hydrogen Evolution Over 100 h in Neutral Water

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Nano-Micro Letters 2020年第10期12卷 247-262页

作者： Shucong Zhang Wenbin Wang Feilong Hu Yan Mi Shuzhe Wang Youwen Liu Xiaomeng Ai Jiakun Fang Huiqiao Li Tianyou Zhai Guangxi Key Laboratory of Chemistry and Engineering of Forest Products Guangxi University for NationalitiesNanning 530008GuangxiPeople’s Republic of China State Key Laboratory of Material Processing and Die and Mould Technology and School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074HubeiPeople’s Republic of China State Key Lab of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuhan 430074HubeiPeople’s Republic of China

Water electrolysis at high current density(1000 mA cm-2 level)with excellent durability especially in neutral electrolyte is the pivotal issue for green hydrogen from experiment to *** addition to the high intrinsic activity determined by the electronic structure,electrocatalysts are also required to be capable of fast mass transfer(electrolyte recharge and bubble overflow)and high mechanical ***,the 2D CoOOH sheet-encapsulated Ni2P into tubular arrays electrocatalytic system was proposed and realized 1000 mA cm-2-levelcurrent-density hydrogen evolution over 100 h in neutral *** designed catalysts,2D stack structure as an adaptive material can buffer the shock of electrolyte convection,hydrogen bubble rupture,and evolution through the release of stress,which insure the long cycle ***,the rich porosity between stacked units contributed the good infiltration of electrolyte and slippage of hydrogen bubbles,guaranteeing electrolyte fast recharge and bubble evolution at the high-current *** that,the electron structure modulation induced by interfacial charge transfer is also beneficial to enhance the intrinsic ***,the multiscale coordinated regulation will provide a guide to design high-efficiency industrial electrocatalysts.

关键词： Large-scale hydrogen production Mass transport 2D adaptive material Interfacial charge modulation Multiscale coordinated regulation

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Direct extraction of topological Zak phase with the synthetic dimension

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Light(Science & Applications) 2023年第4期12卷 671-679页

作者： Guangzhen Li Luojia Wang Rui Ye Yuanlin Zheng Da-Wei Wang Xiong-Jun Liu Avik Dutt Luqi Yuan Xianfeng Chen State Key Laboratory of Advanced Optical Communication Systems and Networks School of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China Shanghai Research Center for Quantum Sciences Shanghai 201315China Interdisciplinary Center for Quantum Information and Zhejiang Province Key Laboratory of Quantum Technology and Device Department of PhysicsZhejiang UniversityHangzhou 310027China InternationalCenter for Quantum Materials and School of Physics Peking UniversityBeijing 100871China International Quantum Academy Shenzhen 518048China Department of Mechanical Engineering Institute for Physical Science and TechnologyUniversity of MarylandCollege ParkMD 20742USA Collaborative Innovation Center of Light Manipulation and Applications Shandong Normal UniversityJinan 250358China

Measuring topological invariants is an essential task in characterizing topological phases of *** are usually obtained from the number of edge states due to the bulk-edge correspondence or from interference since they are integrals of the geometric phases in the energy *** is commonly believed that the bulk band structures could not be directly used to obtain the topological ***,we implement the experimental extraction of Zak phase from the bulk band structures of a Su-Schrieffer-Heeger(SSH)model in the synthetic frequency *** synthetic SSH lattices are constructed in the frequency axis of light,by controlling the coupling strengths between the symmetric and antisymmetric supermodes of two bichromatically driven *** measure the transmission spectra and obtain the projection of the time-resolved band structure on lattice sites,where a strong contrast between the non-trivial and trivial topological phases is *** topological Zak phase is naturally encoded in the bulk band structures of the synthetic SSH lattices,which can hence be experimentally extracted from the transmission spectra in a fiber-based modulated ring platform using a laser with telecom *** method of extracting topological phases from the bulk band structure can be further extended to characterize topological invariants in higher dimensions,while the exhibited trivial and non-trivial transmission spectra from the topological transition may find future applications in optical communications.

关键词： topological trivial synthetic

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3D-bioprinted vascular scaffold with tunable mechanical properties for simulating and promoting neo-vascularization

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Smart Materials in Medicine 2022年 3卷 199-208页

作者： Zhou, Xin Gao, Qiang Yu, Dan Shao, Yichun Wang, Zhaohui Liu, Xiao Wang, Wenwu Chang, Likun Ma, Tianxiang Mok, Hsiaopei Cen, Jianzheng Chen, Jimei Tahchi, Mario El Zhuang, Jian Mou, Fangzhi Zhang, Jin Yin, Yixia State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Department of Cardiac Surgery Guangdong Cardiovascular Institute Guangdong Provincial People's Hospital Guangdong Academy of Medical Sciences Guangzhou510100 China Key Laboratory for Biomechanics and Mechanobiology of the Ministry of Education Beijing Advanced Innovation Centre for Biomedical Engineering School of Biological Science and Medical Engineering Beihang University Beijing100083 China LBMI Department of Physics Faculty of Sciences 2 Lebanese University P.O. Box 90656 Jdeidet Lebanon Qingyuan Innovation Laboratory College of Chemical Engineering Fuzhou University 2 Xueyuan Road Fuzhou350108 China

Alternative artificial vessels with tissue-matching mechanical and biological performance have been continuously taking great attention in bioengineering. However, it is challenging to take into account both mechanical and biological properties in formulating a hydrogel material. In the current study, a composite hydrogel ink based on geltain-methacryloyl (GelMA) and sodium alginate (SA) was prepared by a two-step polymerization process, and its fast shaping was realized by stabilizing the alginate fraction in calcium ion bath as well as the photo-crosslinking of GelMA. Mechanical properties of the transparent 3D printing GelMA/Gelatin/SA blood vessels were determined by testing their stretching and resilience performance. Based on Von Mise stress simulation using Ansys, strain of the artificial blood vessels reached 147% and the elastic Young's modulus reached approximately 224 kPa in the optimal hydrogel formulation, matching well with capability of enduring certain blood pressure encountered in real tissue. A selective and uniform permeability of hydrogel tubes was presented by using small molecules and human red blood cells, meanwhile excellent hemolysis, cell viability, and proliferation ability were also verified. Based on the results of in vitro assessment and the in vivo transplantation in SD rats, our proposed GelMA/Gelatin/SA vessels, with tissue-matching mechanical properties and their ideal biodegradation behavior, promoted neo-vascularization capacity and showed promising potential in producing an artificial blood vessel. © 2022 The Authors

关键词： Blood

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