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An aqueous rechargeable Fe//LiMn_(2)O_()hybrid battery with superior electrochemical performance beyond mainstream Fe-based batteries

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Nano Research 2024年第6期17卷 5168-5178页

作者： Yu Liu Dehui Xie Yuxin Shi Rongguan Lv Yingna Chang Yuzhen Sun Zhiyuan Zhao Jindi Wang Kefan Song Huayu wu Tuan K.A.Hoang Rong Xing Huan Pang Institute of New Energy on Chemical Storage and Power Sources School of Chemical and Environmental EngineeringYancheng Teachers UniversityYancheng 224000China School of Chemistry and Chemical Engineering Yangzhou UniversityYangzhou 225009China Department of Chemical Engineering University of Waterloo200 University Avenue WestWaterlooOntario N2L 3G1Canada

Aqueous rechargeable batteries(ARBs)are generally safer than non-aqueous analogues,they are also less-expensive,and more friendly to the ***,the inherent disadvantage of the narrow electrochemical window of H2O seriously restricts the energy density and output voltage of ARBs,especially aqueous rechargeable Fe-based ***,we introduce a new battery system:the anode contains C@Fe/Fe_(2)O_(3)composite,which is interfaced with an alkaline electrolyte;the cathode contains LiMn_(2)O_()in contact with a neutral electrolyte.A Li^(+)-conducting membrane is carefully selected to decouple the electrode-electrolyte,which effectively widens the electrochemical window to above 2.65 V,thereby enables an aqueous rechargeable iron *** average output voltage is 1.83 V and its energy density is 235.3 Wh/kg at 549 W/*** this work,we propose the energy storage mechanism with the aid of density functional theory(DFT).The calculated reduction potential of the anode agrees with the experimental ***,this battery system demonstrates long cycle lifespan of approximately 2500 cycles at 2 A/g,corresponding to a capacity retention of 82.1%.These results are very far superior than those of mainstream aqueous rechargeable Fe-based batteries,which guarantee future investigation for storing electricity energy.

关键词： aqueous battery high voltage high energy iron oxide theoretical calculation

Fine-Grained Features for Image Captioning

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Computers, Materials & Continua 2023年第6期75卷 4697-4712页

作者： Mengyue Shao jie Feng jie wu Haixiang Zhang Yayu Zheng Zhejiang Sci-Tech University Hangzhou310020China Zhejiang University of Technology Hangzhou310020China

Image captioning involves two different major modalities(image and sentence)that convert a given image into a language that adheres to visual *** all methods first extract image features to reduce the difficulty of visual semantic embedding and then use the caption model to generate fluent *** Convolutional Neural Network(CNN)is often used to extract image features in image captioning,and the use of object detection networks to extract region features has achieved great ***,the region features retrieved by this method are object-level and do not pay attention to fine-grained details because of the detection model’s *** offer an approach to address this issue that more properly generates captions by fusing fine-grained features and region ***,we extract fine-grained features using a panoramic segmentation ***,we suggest two fusion methods and contrast their fusion *** X-linear Attention Network(X-LAN)serves as the foundation for both fusion *** to experimental findings on the COCO dataset,the two-branch fusion approach is *** is important to note that on the COCO Karpathy test split,CIDEr is increased up to 134.3%in comparison to the baseline,highlighting the potency and viability of our method.

关键词： Image captioning region features fine-grained features fusion

Adaptive functional link network control of near-space vehicles with dynamical uncertainties

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Journal of Systems Engineering and Electronics 2010年第5期21卷 868-876页

作者： Yanli Du Qingxian wu Changsheng Jiang jie Wen College of Automation Engineering Nanjing University of Aeronautics and Astronautics Nanjing 210016 E R. China

The control law design for a near-space hypersonic vehicle（NHV） is highly challenging due to its inherent nonlinearity,plant uncertainties and sensitivity to *** paper presents a novel functional link network（FLN） control method for an NHV with dynamical thrust and parameter *** approach devises a new partially-feedback-functional-link-network（PFFLN） adaptive law and combines it with the nonlinear generalized predictive control（NGPC） *** PFFLN is employed for approximating uncertainties in *** weights are online tuned based on Lyapunov stability theorem for the first *** learning process does not need any offline training ***,a robust controller with an adaptive gain is designed to offset the approximation ***,simulation results show a satisfactory performance for the NHV attitude tracking,and also illustrate the controller＇s robustness.

关键词： adaptive control system dynamical uncertainties partially feedback functional link network near-space vehicle.

“全民阅读”概念史考析——基于知识建构、制度演进、文明交融三重脉络

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编辑之友 2024年第9期 10-21页

作者：吴赟浙江大学传媒与国际文化学院浙江杭州310058

文章对知识建构、制度演进、文明交融三重脉络中的“全民阅读”概念史予以深度考析。通过研究,有三方面发现:其一,在出版学“意义之网”中,“全民阅读”是一个连接诸多节点的重要纽带,这一标识性概念反映了中国的经验和价值,具有特定的... 详细信息

文章对知识建构、制度演进、文明交融三重脉络中的“全民阅读”概念史予以深度考析。通过研究,有三方面发现:其一,在出版学“意义之网”中,“全民阅读”是一个连接诸多节点的重要纽带,这一标识性概念反映了中国的经验和价值,具有特定的中国内涵,为出版学知识体系提供了新的知识增量;其二,“全民阅读”概念的“制度化”进程,折射了当代中国社会转型期探索经验和社会理念、文化生态之变化,体现了“全民阅读”概念在中国经历的政策化乃至观念化的过程;其三,“全民阅读”是一个已经在中国社会被普遍接受并形成相当话语力量、反映本土经验和价值、深入社会大众日常生活的标识性概念。归纳而言,这一概念具有三方面的特征:兼具国际性和本土化两重属性;立足本土实践经验,反映本土社会事实;根植本土阅读文化,反映本土阅读价值观念。

关键词：全民阅读概念史知识建构制度演进文明交融

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Fuel type recognition of ester isomer additives in flames by optical diagnostics coupled with machine learning method

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Science China Technological Sciences 2024年第11期67卷 3431-3442页

作者： HE JiaYing CHEN MengFei wu BingKun YING YaoYao YAN Weijie LI TianJiao LIU Dong MIIT Key Laboratory of Thermal Control of Electronic Equipment School of Energy and Power EngineeringNanjing University of Science and Technology Advanced Combustion Laboratory School of Energy and Power EngineeringNanjing University of Science and Technology

Based on machine learning models, an approach for the type recognition of oxygenated additives(ester isomers, i.e., methyl butyrate, methyl crotonate, ethyl acrylate, and ethyl acrylate) via optical diagnostics was proposed. By utilizing optical diagnostic methods flame features were extracted, and three models including random forest(RF), artificial neural network(ANN),and support vector machine(SVM), were employed to establish the relationship between flame images and oxygenated additives. Moreover, the impact of multiple factors on model performance, including image compression, dataset size, and feature number was also investigated. The images of flame obtained from inverse diffusion flame under four different oxygenated additives and various combustion conditions were used as examples to examine the effectiveness of the proposed approach. Results indicated that the accuracy of the recognition of ester isomers by the proposed approach exceeded 90%.Furthermore, it is observed that image compression had minimal impact on prediction accuracy but significantly reduced processing time. Different types of features contributed to predicting the type of ester isomers variously, and all models exhibited improved accuracy with an increased number of features. The number of samples significantly affected model accuracy. The investigation of feature missing and insufficient training samples suggested that ANN and RF models were more suitable for cases with many missing features, while SVM was more suitable for dealing with small samples.

关键词： fuel recognition machine learning feature extraction optical diagnostics ester isomers

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How ligand coordination and superatomic-states accommodate the structure and property of a metal cluster:Cu_(4)(dppy)_(4)Cl_(2)***_(21)(dppy)_(10)with altered photoluminescence

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Chinese Chemical Letters 2024年第1期35卷 528-532页

作者： Haiming wu Gaya NAndrew Rajini Anumula Zhixun Luo Beijing National Laboratory for Molecular Sciences(BNLMS) State Key Laboratory for Structural Chemistry of Unstable and Stable SpeciesInstitute of ChemistryChinese Academy of SciencesBeijing 100190China School of Chemistry University of Chinese Academy of SciencesBeijing 100049China

We have synthesized two copper nanoclusters(NCs)with a protection of the same ligand diphenylphosphino-2-pyridine(C_(17)H_(14)NP,dppy for short),formulated as Cu_(4)(dppy)_(4)Cl_(2)and Cu21(dppy)10,*** former one bears a distorted tetrahedron Cu4 core with its six edges fully protected by chlorine and dppy ligands,while the latter presents a symmetric Cu_(21)core on which ten dppy molecules function as monolayer protection via well-organized monodentate or bidentate ***,the Cu_(4)(dppy)_(4)Cl_(2)cluster exhibits a strong yellow emission at∼577 nm,while Cu_(21)(dppy)_(10)displays dual emissions in purple(∼368 nm)and green(∼516 nm)regions *** combination with TD-DFT calculations,we demonstrate the origin of altered emissions and unique stability of the two copper nanoclusters pertaining to the ligand coordination and metallic superatomic states.

关键词： Copper nanocluster Yellow emission Dual emission Superatomic states Ligand dppy

Effect of rotor-mounted protrusion on sealing performance and flow structure in rotor-stator cavity

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Chinese Journal of Aeronautics 2018年第11期31卷 2057-2072页

作者： Nan CAO Xiang LUO Zeyu wu jie WEN National Key Laboratory of Science and Technology on Aero-Engine Aero-Thermodynamics School of Energy and Power EngineeringBeihang UniversityBeijing 100083China Collaborative Innovation Center for Advanced Aero-Engine Beijing 100083China

This paper presents an experimental investigation on the effect of protrusion radial position and height on the sealing performance and flow structure in the rotor-stator cavity. The rotormounted protrusions are assembled at three radial positions and are set to three heights. The cavity is equipped with three rim seals: a radial seal, an axial seal and a seal with double fins on the *** annulus Reynolds number is set at 4:39 ×10;and the rotational Reynolds number ranges from 7:51×10;to 1:20×10;. Heat and mass transfer analogy is applied. Pressure and CO;concentration are measured. The experimental results show that in cavities with different rim seals, radial distributions of the sealing efficiency, pressure and swirl ratio are basically the same. The sealing performance is improved by protrusions compared with the cavity without protrusion and improves with the increase of protrusion radial position and height. The effect of protrusion increases with the increase of the rotational Reynolds number. The windage loss and the flow resistance introduced by protrusions are investigated. It is found that induced windage loss and flow resistance decrease with the increase of protrusion radial position but increase with the protrusion height.

关键词： Height Protrusion Radial position Rim seal Sealing performance

Influence of permeability anisotropy of seepage flow on the tunnel face stability

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Underground Space 2023年第1期8卷 1-14页

作者： Qiguang Di Pengfei Li mingju Zhang jie wu Key Laboratory of Urban Security and Disaster Engineering Ministry of EducationBeijing University of TechnologyBeijing 100124China

This paper focuses on the influence of permeability anisotropy of seepage flow on the face stability for a shied *** analytical model has been proposed to present the hydraulic head distribution around the tunnel face in the anisotropic ground,considering the difference of permeability coefficient in the horizontal direction and the vertical *** rationality of the proposed model is ver-ified by a series of numerical ***,an analytical model of face stability for a tunnel under the anisotropic seepage has been established based on the limit analysis upper bound *** of the analytical solutions and the numerical simulations are conducted,and the limit support pressure of the two methods is *** effect of permeability anisotropy and water pressure on the stability of the tunnel face is analyzed through the three-dimensional analytical *** of permeability has a significant impact on the stability of the tunnel face,and its impact gradually *** can also be found that the water pressure coefficient of the tunnel face has a significant effect on the limit support pressure and the failure area when the ratio of the horizontal permeability to the vertical permeability is large.

关键词： Seepage flow Hydraulic head distribution Permeability anisotropy Shield tunnel Water pressure

A novel obstacle avoidance heuristic algorithm of continuum robot based on FABRIK

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Science China(Technological Sciences) 2022年第12期65卷 2952-2966页

作者： wu HaoRan YU JingJun PAN jie PEI Xu Robotics Institute Beihang UniversityBeijing 100191China Department of Mechanical Design Beihang UniversityBeijing 100191China

Obstacle avoidance and path planning of continuum robots are challenging tasks due to the hyper-redundant degree of freedoms(DOFs)and restricted working ***,most current heuristic algorithm-based obstacle avoidance algorithms exist with low computational efficiency,complex solution process,and inability to add global *** paper proposes a novel obstacle avoidance heuristic algorithm based on the forward and backward reaching inverse kinematics(FABRIK)*** update of key nodes in this algorithm is modeled as the movement of charges in an electric field,avoiding complex nonlinear *** algorithm achieves the robustness of inverse kinematics and path tracking in complex environments by imposing constraints on key nodes and determining the location of obstacles in *** algorithm is characterized by a high convergence rate,low computational cost,and can be used for real-time *** proposed approach also has wide applicability and can be applied to both mobile and fixed-base continuum *** it can be further extended to the field of hyper-redundant *** algorithm's effectiveness is further validated by simulating the path tracking and obstacle avoidance of a five-segment continuum robot in various environments and comparisons with classical methods.

关键词： continuum robot FABRIK algorithm obstacle avoidance motion planning