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Universal design of three-dimensional porous graphene-iron based promotors for kinetically rationalized lithium-sulfur chemistry

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Journal of Energy Chemistry 2025年第1期100卷 192-200页

作者： Hua Gao yunfeng zhang Menglei Wang Ruoxuan Yang Shuai Feng Xuan Cao Yaping zhang Zhongyuan Lu Yingze Song State Key Laboratory of Environment-Friendly Energy Materials School of Materials and Chemistry Southwest University of Science and Technology School of Material Science and Engineering Henan University of Technology College of Chemistry and Chemical Engineering Taishan University

Lithium-sulfur （Li-S） batteries are widely deemed to be one of the most potential candidates for future secondary batteries because of their remarkable energy ***,notorious polysulfide shuttling and retarded sulfur reaction kinetics pose significant obstacles to the further application of Li-S *** rationally designed highly active electrocatalysts can facilitate polysulfide conversion,the universal and scalable synthesis strategies need to be ***,a universal synthetic strategy to construct a series of three-dimensional （3D） porous graphene-iron （3DGr-Fe） based electrocatalysts involving 3DGr-FeP,3DGr-Fe3C,and 3DGr-Fe3Se4is exploited for manipulating the Li-S redox *** has been observed that the implementation of a 3D porous Gr architecture leads to the well-designed conductive networks,while the uniformly dispersed iron nanoparticles introduce an abundance of active sites,fostering the lithium polysulfide conversion,thereby bolstering the overall electrochemical *** Li-S battery with the 3DGr-Fe based electrocatalyst exhibits remarkable capacity retention of 94.8%upon 100 times at 0.2 ***,the soft-packaged Li-S pouch cell based on such a 3DGr-Fe electrocatalyst delivers superior capacity of 1060.71 mA h g-1and guarantees for the continuous 30 min work of fan *** investigation gives comprehensive insights into the design,synthesis,and mechanism of 3DGr-Fe based electrocatalysts with high activity toward efficient and durable Li-S batteries.

关键词： Lithium-sulfur battery Universal synthesis 3D graphene-iron based promotor Electrocatalysis

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Experimental study of vibration mitigation of mast arm signal structures with particle-thrust damping based tuned mass damper

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Earthquake Engineering and Engineering Vibration 2019年第1期18卷 219-231页

作者： zhang yunfeng Liu Heng Dept.of Civil & Environmental Engineering University of Maryland College Park

Large amplitude vibration of mast arm structures due to wind loads are the primary contributing factor to the reduced fatigue life of signal support structures. To alleviate this problem of wind-induced in-plane vibration of mast arm signal structures, a particle-thrust damping based turned mass damper(PTD-TMD) device is adopted and its damping effect is characterized experimentally. The particle-thrust damping is a passive damping device that does not require electric power and is temperature independent. Based on the calibration test, an equivalent dynamic model of the PTD-TMD device is developed and used for numerical simulation study. The damping effects of this PTD-TMD device on signal support structures was investigated through both numerical analysis and laboratory testing of a 50-ft(15.24 m) mast arm structure including both free vibration and forced vibration tests. The experimental test and numerical study results show that vibration response behavior of mast arm signal support structures can be significantly reduced by installing the PTD-TMD that can increase the critical damping ratio of the mast arm signal structures to 4%. The stress range at the welded connection between the mast arm and traffic pole is also reduced.

关键词： fatigue mast arm signal support structures tuned mass damper vibration

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Seismic analysis of diagrid structural frames with shear-link fuse devices

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Earthquake Engineering and Engineering Vibration 2013年第3期12卷 463-472页

作者： Nasim S. Moghaddasi B. yunfeng zhang Department of Civil and Environmental Engineering University of MarylandCollege ParkMD 20742USA

This paper presents a new concept for enhancing the seismic ductility and damping capacity of diagrid structural frames by using shear-link fuse devices and its seismic performance is assessed through nonlinear static and dynamic analysis. The architectural elegancy of the diagrid structure attributed to its triangular leaning member configuration and high structural redundancy make this system a desirable choice for tall building design. However, forming a stable energy dissipation mechanism in diagrid framing remains to be investigated to expand its use in regions with high seismicity. To address this issue, a diagrid framing design is proposed here which provides a competitive design option in highly seismic regions through its increased ductility and improved energy dissipation capacity provided by replaceable shear links interconnecting the diagonal members at their *** structural characteristics and seismic behavior （capacity, stiffness, energy dissipation, ductility） of the diagrid structural frame are demonstrated with a 21-story building diagrid frame subjected to nonlinear static and dynamic analysis. The findings from the nonfinear time history analysis verify that satisfactory seismic performance can be achieved by the proposed diagrid frame subjected to design basis earthquakes in California. In particular, one appealing feature of the proposed diagrid building is its reduced residual displacement after strong earthquakes.

关键词： diagrid structure nonlinear analysis seismic behavior shear link steel structure

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Kernel-blending connection approximated by a neural network for image classification

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Computational Visual Media 2020年第4期6卷 467-476页

作者： Xinxin Liu yunfeng zhang Fangxun Bao Kai Shao Ziyi Sun Caiming zhang Shandong University of Finance and Economics Jinan 250014China Shandong University Jinan 250100China

This paper proposes a kernel-blending connection approximated by a neural network(KBNN)for image classification.A kernel mapping connection structure,guaranteed by the function approximation theorem,is devised to blend feature extraction and feature classification through neural network ***,a feature extractor learns features from the raw ***,an automatically constructed kernel mapping connection maps the feature vectors into a feature ***,a linear classifier is used as an output layer of the neural network to provide classification ***,a novel loss function involving a cross-entropy loss and a hinge loss is proposed to improve the generalizability of the neural *** results on three well-known image datasets illustrate that the proposed method has good classification accuracy and generalizability.

关键词： image classification blending neural network function approximation kernel mapping connection generalizability

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Seismic retrofitting of reinforced concrete frame structures using GFRP-tube-confined-concrete composite braces

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Earthquake Engineering and Engineering Vibration 2012年第1期11卷 91-105页

作者： Nasim S. Moghaddasi B zhang yunfeng Hu Xiaobin Department of Civil and Environmental Engineering University of Maryland College Park MD 20742 USA School of Civil and Architecture Engineering Wuhan University Wuhan 430072 China

This paper presents a new type of structural bracing intended for seismic retrofitting use in framed structures. This special composite brace, termed glass-fiber-reinforced-polymer （GFRP）-tube-confined-concrete composite brace, is comprised of concrete confined by a GFRP tube and an inner steel core for energy dissipation. Together with a contribution from the GFRP-tube confined concrete, the composite brace shows a substantially increased stiffness to control story drift, which is often a preferred feature in seismic retrofitting. An analysis model is established and implemented in a general finite element analysis program - OpenSees, for simulating the load-displacement behavior of the composite brace. Using this model, a parametric study of the hysteretic behavior （energy dissipation, stiffness, ductility and strength） of the composite brace was conducted under static cyclic loading and it was found that the area ratio of steel core to concrete has the greatest influence among all the parameters considered. To demonstrate the application of the composite brace in seismic retrofitting, a three-story nonductile reinforced concrete （RC） frame structure was retrofitted with the composite braces. Pushover analysis and nonlinear time-history analyses of the retrofitted RC frame structure was performed by employing a suite of 20 strong ground motion earthquake records. The analysis results show that the composite braces can effectively reduce the peak seismic responses of the RC frame structure without significantly increasing the base shear demand.

关键词： brace composite confined concrete glass-fiber-reinforced polymer frame nonlinear analysis retrofit seismic

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Characterization and mapping of a new male sterility mutant of anther advanced dehiscence(t) in rice

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Journal of Genetics and Genomics 2008年第3期35卷 177-182页

作者： Yi zhang yunfeng Li Jian zhang Fucheng Shen Yuanxin Huang Zhiwei Wu Key Laboratory of Biotechnology and Crop Quality Improvement Ministry of Agriculture Southwest University Chongqing 400716 China

Anther dehiscence is very important for pollen maturation and release. The mutants of anther dehiscence in rice （Oryza sativa L.） are few, and related research remains poor. A male sterility mutant of anther dehiscence in advance, add（t）, has been found in Minghui 63 and its sterility is not sensitive to thermo-photo. To learn the character of sterilization and the function of the add（t） gene, the morphological and cytological studies on the anther and pollen, the ability of the pistil being fertilized, inheritance of the mutant, and mapping of add（t） gene have been conducted. The anther size is normal but the color is white in the mutant against the natural yellow in the wild-type. The pollen is malformed, unstained, and small in the KI-I2 solution. The anther dehiscence is in advance at the bicellular pollen stage. A crossing test indicated that the grain setting ratio of the add（t） is significantly lower than that of the CMS line 2085A. The ability of the pistil being fertilized is most probably decreased by the add（t） gene. The male sterility is controlled by a single recessive gene of add（t）. This gene is mapped between the markers of R02004 （InDel） and RM300 （SSR） on chromosome 2, and the genetic distance from the add（t） gene to these markers is 0.78 cM and 4.66 cM, respectively.

关键词： male sterility sterility character gene mapping rice

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Sedimentation and morphological changes at Yuantuojiao Point, estuary of the North Branch, Changjiang River

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Acta Oceanologica Sinica 2013年第2期32卷 24-34页

作者： XIE Li zhang Zhenke zhang yunfeng WANG Yaping HUANG Xianjin School of Geographic and Oceanographic Sciences Key Laboratory of Coast and Island Development of MOENanjing University School of Resources and Environment of Guangdong University of Business Studies

The North Branch, separated by the Chongming Island, was once the main channel in the estuary of the Changjiang River. Reclamation and a decrease in runoffto the North Branch had led to the narrowing and shallowing of the channel. The Yuantuojiao Point is located at the intersecting point connecting the North Branch of the Changjiang River and the Jiangsu coastline. Erosion cliffs are developed between the typical silty-muddy tidal flat and the salt marsh occupied by Spartina alterniflorea, and this has changed rapidly over the past few years. The sediment grain size analysis results of the surficial and two core samples indi- cate that the Yuantuoiiao Point tidal fiat experienced continuous accretional processes. Based upon 137Cs analysis results of the YT and YY Cores sampled from the tidal flat at the Yuantuojiao Point, the average sed- imentation rate of the YT Core was 2.30 cm/a from 1963 to 2007, and 2.38 cm/a from 1954 to 2007 for the YY Core. The sedimentation rates of both core locations have declined since the 1960s corresponding to the seaward reclamation at the Yuantuojiao Point. The average sedimentation rates at the Yuantnojiao Point were similar to that of the silty-muddy tidal flat at the northern ]iangsu coast, but lower than that of the south of the Changjiang River Estuary. According to field morphological investigations from 2006 to 2008 on the salt marsh at the Yuantuojiao Point, cliffs retreated markedly by storm surges and disappeared gradu- ally because of the rapid sedimentation on the silty-muddy tidal flat. The maximum annual retreat reached 10 m. The recent sedimentation and morphological changes of the Yuantuojiao Point tidal flat not only displayed the retreat of the salt marsh and the disappearance of cliffs, but also was accompanied by rapid sedimentation of the silty-muddy tidal flat and the salt marsh, indicating the responses to the tidal currents, storm surges, Spartina alterniflorea trapping sediments and large-scale reclamation.

关键词： sedimentation rate morphological changes the tidal fiat salt marsh cliff seaward reclamation Yuantuojiao Point the North Branch of the Changjiang River

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Smooth fractal surfaces derived from bicubic rational fractal interpolation functions

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Science China(Information Sciences) 2018年第9期61卷 335-345页

作者： Fangxun BAO Xunxiang YAO Qinghua SUN yunfeng zhang Caiming zhang School of Mathematics Shandong University Faculty of Engineering and Information Technology University of Technology Sydney School of Computer Science & Technology Shandong University of Finance and Economics

Dear editor,Fractal geometry is an important and active branch of nonlinear *** has attracted more and more attention[1,2].As an important research field of fractal geometry,fractal interpola-

关键词： Rational Bi IFS Pi Smooth fractal surfaces derived from bicubic rational fractal interpolation functions FIS Figure

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Hearing characteristics of cephalopods: Modeling and environmental impact study

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Integrative Zoology 2015年第1期10卷 141-151页

作者： yunfeng zhang Feng SHI Jiakun SONG Xugang zhang Shiliang YU Department of Civil and Environmental Engineering University of MarylandCollege ParkMarylandUSA Institute for Marine Biosystem and Neurosciences Shanghai Ocean UniversityShanghaiChina

Cephalopods(octopus,squid and cuttlefish)are some of the most intriguing molluscs,and they represent economically important commercial marine species for *** studies have shown that cephalopods are sensitive to underwater particle motion,especially at low frequencies in the order of 10 *** present paper deals with quantitative modeling of the statocyst system in three cephalopod species:Octopus vulgaris,Sepia officinalis and Loligo *** octopus’s macula/statolith organ was modeled as a 2nd-order dynamic oscillator using parameter values estimated from scanning electron micrograph *** modeling results agree reasonably well with experimental data(acceleration threshold)in the three cephalopod *** made from quantitative modeling and simulating the particle motion sensing mechanism of cephalopods elucidated their underwater particle motion detection *** to emerging environmental issues,such as low frequency noise caused by near-shore wind farms and increasing levels of carbon dioxide in the ocean,and sensitivity to sounds produced by impending landslides were investigated in octopus using the model.

关键词： cephalopod hearing threshold octopus particle motion

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Special Issue on Resilience in Steel Structures

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Frontiers of Structural and Civil Engineering 2016年第3期10卷 237-238页

作者： Wang, Wei Chan, Tak-Ming zhang, yunfeng Tongji Univ Struct Engn Shanghai Peoples R China Hong Kong Polytech Univ Struct Engn Hong Kong Hong Kong Peoples R China Univ Maryland Struct Engn College Pk MD 20742 USA

This special issue of Frontiers of Structural and Civil Engineering features nine technical papers focusing on resilience in steel structures with authors from Canada, China, Italy, Portugal, Singapore and the United States. Through their contributions, they have shared their technical expertise in innovative solution towards resilience in steel structures by conducting experimental investigation, formulating analytical modelling and developing finite-element simulation. Papers also addressed the topical issue on life-cycle costing, constructability and reparability. Current design provisions were also assessed and new design concepts and solutions were proposed. The following are the highlights of each of the technical contributions.

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