检索结果-南通市图书馆

Simulation of anchor chain based on lumped mass method

同方期刊数据库

同方期刊数据库更多评论

在线全文

学校读者我要写书评

暂无评论

Theoretical & Applied Mechanics Letters 2023年第4期13卷 311-319页

作者： Xiaobin jiang jian gan Shiyang Teng Merchant Marine College Shanghai Maritime UniversityShanghai 201306China

In order to develop a anchoring operation simulation system and improve safety during anchoring operations,a relatively accurate mathematical model of anchoring operations needs to be *** this paper,the stress condition of anchor chain under environmental and subsea geological conditions is further studied and the stress condition of anchor chain is analyzed based on the previous *** this paper,a quasi-static model based on catenary method is used as the basis of dynamic analysis,and the dynamic model of anchor chain is established based on the concentrated mass method,which fully considers the influence of anchor chain weight,hydrodynamic force,ocean current and interaction with the *** fourth-order Runge Kutta method was used to solve the model numerically,and a calculation procedure was *** accuracy of the model was verified by comparing the calculated results with the experimental results,indicating that the constructed anchor chain dynamics model has a high accuracy.

关键词： Lump mass method Anchor chain Dynamic analysis

A review and perspective on molybdenum-based electrocatalysts for hydrogen evolution reaction

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2020年第4期39卷 335-351页

作者： Wei Hua Huan-Huan Sun Fei Xu jian-gan Wang Nano Energy Materials School of Materials Science and EngineeringNorthwestern Poly technical UniversityXi'an 710072China Shaanxi Joint Laboratory of Graphene(NPU) Xi'an 710072China

Water electrolysis has been considered as a sustainable way for producing renewable energy of ***,this process requires a low-cost and high-efficient hydrogen evolution reaction(HER)catalyst to improve the overall reaction ***(Mo)-based electrocatalysts are regarded as the promising candidates to replace the benchmark but expensive Ptbased HER catalysts,due to their high activity and stability in a wide pH *** this review,we present a comprehensive and critical summary on the recent progress in the Mo-based electrodes for HER,including molybdenum alloys,molybdenum sulfides,molybdenum selenides,molybdenum carbides,molybdenum phosphides,molybdenum borides,molybdenum nitrides,and molybdenum *** attention is mainly focused on the synthetic methods of Mo-based materials,the strategies for increasing the catalytic activity,and the relationship between structure/composition and electrocatalytic ***,the future development and perspectives of Mo-based electrocatalysts toward high HER performance are proposed.

关键词： Mo-based materials Electrocatalysts Hydrogen evolution reaction Water splitting

Rational construction of CoP@C hollow structure for ultrafast and stable sodium energy storage

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2022年第6期41卷 1859-1869页

作者： Ling-BoRen Wei Hua Zhi-Dong Hou jian-gan Wang State Key Laboratory of Solidification Processing Center for Nano Energy MaterialsSchool of Materials Science andEngineeringNorthwestern Polytechnical University and Shaanxi Joint Laboratory of Graphene(NPU)Xi'an 710072China

The development of transition metal phosphides as potential anode materials of sodium-ion batteries has been substantially hindered by their sluggish kinetics and significant volume change during the sodiation/desodiation *** this work,we put forward a rational design strategy to construct a hollow-structured CoP@C com-posite to achieve ultrafast and durable sodium energy *** CoP@C composite with a well-defined hollow dodecahedron architecture has been synthesized via a stepwise treatment of carbonization and pohsphorization on *** unique hollow carbon framework not only provides high-speed electron/ion transportation pathways for CoP to enable fast sodiation kinetics,but also accom-modates large volume change to stabilize the electrode *** a consequence,the CoP@C composite could exhibit an ultra-high rate capability of 105 mAh·g^(-1)at a current density of 30 A·g^(-1),and a long-term cycling *** present study will pave a fresh strategy for exploring advanced high-power anode materials for sodium ion batteries.

关键词： Transition metal phosphide Hollow structure Anode:High-rate capability Sodium ion battery

Cage-confinement synthesis of MoC nanoclusers as efficient sulfiphilic and lithiophilic regulator for superior Li–S batteries

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2024年第2期43卷 624-634页

作者： Xing-Yuan Zhang Mei-Na Lei Shan Tian jian-gan Wang State Key Laboratory of Solidification Processing Center for Nano Energy MaterialsSchool of Materials Science and EngineeringNorthwestern Polytechnical University and Shaanxi Joint Laboratory of Graphene(NPU)Xi’an710072China

High-energy-density Li-S batteries are subjected to serious sulfur deactivation and short cycle lifetime caused by undesirable polysulfide shuttle effect and frantic lithium dendrite *** this work,a controllable cage-confinement strategy to fabricate molybdenum carbide(MoC)nanoclusters as a high-efficient sulfiphilic and lithiophilic regulator to mitigate the formidable issues of Li-S batteries is *** sub-2 nm MoC nanoclusters not only guarantee robust chemisorption and fast electrocatalytic conversion of polysulfides to enhance the sulfur electrochemistry,but also homogenize Li^(+) flux to suppress the lithium dendrite *** a consequence,the MoC-modified separator endows the batteries with boosted reaction kinetics,promoted sulfur utilization,and improved cycling stability.A reversible capacity of 701 mAh·g^(−1) at a high rate of 5.0C and a small decay rate of 0.076%per cycle at 1.0C over 600 cycles are *** study offers a rational route for design and synthesis of bifunctional nanoclusers with both sulfiphilicity and lithiophilicity for high-performance Li-S batteries.

关键词： Li-S batteries Nanocluster Electrocatalyst Polysulfide shuttle Li dendrites

An in-depth mechanistic insight into the redox reaction and degradation of aqueous Zn-MnO_(2) batteries

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2023年第4期34卷 531-536页

作者： Zongyuan You Wei Hua Na Li Huanyan Liu jian-gan Wang State Key Laboratory of Solidication Processing Center for Nano Energy MaterialsSchool of Materials Science and EngineeringNorthwestern Polytechnical UniversityShaanxi Joint Lab of Graphene(NPU)Xi’an 710072China

Rechargeable aqueous Zn/MnO_(2)batteries raise massive research activities in recent years. However, both the working principle and the degradation mechanism of this battery chemistry are still under debate. Herein, we provide an in-depth electrochemical and structural investigation on this controversial issue based on α-MnO_(2)crystalline nanowires. Mechanistic analysis substantiates a two-electron reaction pathway of Mn2+/Mn4+redox couple from part of MnO_(2)accompanying with a reversible precipitation/dissolution of flaky zinc sulfate hydroxide(ZSH) during the discharge/charge processes. The formation of the ZSH layer is double-edged, which passivates the deep dissolution of MnO_(2)upon discharging,but promotes the electrochemical deposition kinetics of active MnO_(2)upon charging. The cell degradation originates primarily from the corrosion failure of metallic zinc anode and the accumulation of irreversible ZnMn2O_(4)phases on the cathode. The addition of MnSO_(4)to the electrolyte could afford supplementary capacity contribution via electro-oxidation of Mn2+. However, a high MnSO_(4)concentration will expedite the cell failure by corroding the metallic zinc anodes. The present study will shed a fundamental insight on developing new strategies toward practically viable Zn/MnO_(2)batteries.

关键词： Zinc-ion battery MnO_(2)cathode Working mechanism Degradation mechanism Zinc anode

Modeling the dynamical friction timescale of a sinking satellite

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2010年第12期10卷 1242-1254页

作者： jian-Ling gan Xi Kang Jin-Liang Hou Rui-Xiang Chang Key Laboratory for Research in Galaxies and Cosmology Shanghai Astronomical Observatory Chinese Academy of Sciences Shanghai 200030 China jlgan@*** Purple Mountain Observatory Chinese Academy of Sciences Nanjing 210008 China Graduate University of Chinese Academy of Sciences Beijing 100049 China

When a satellite galaxy falls into a massive dark matter halo, it suffers from the dynamical friction force which drags it into the halo＇s center, where it finally merges with the central galaxy. The time interval between entry and merger is called the dynamical friction timescale （Tdf）. Many studies have been dedicated to deriving Tdf using analytical models or N-body simulations. These studies have obtained qualitative agreements on how Zdf depends on the orbital parameters, and the mass ratio between the satellite and the host＇s halo. However, there are still disagreements on deriving an accurate form for Tdf. We present a semi-analytical model to predict Tdf and we focus on interpreting the discrepancies among different studies. We find that the treatment of mass loss from the satellite by tidal stripping dominates the behavior of Tdf. We also identify other model parameters which affect the predicted Tdf.

关键词： methods: analytical -- methods: numerical-- galaxies: haloes -- galax-ies: evolution -- galaxies: interactions -- cosmology: dark matter

Regulation of pseudographitic carbon domain to boost sodium energy storage

在线全文

学校读者我要写书评

暂无评论

Nano Research 2024年第6期17卷 5188-5196页

作者： Zhidong Hou Mingwei jiang Da Lei Xiang Zhang Yuyang Gao jian-gan Wang State Key Laboratory of Solidification Processing Center for Nano Energy MaterialsSchool of Materials Science and EngineeringNorthwestern Polytechnical University and Shaanxi Joint Lab of Graphene(NPU)Xi’an 710072China

Hard carbon anode has shown extraordinary potentials for sodium-ion batteries(SIBs)owing to the cost-effectiveness and advantaged ***,the widespread application of hard carbon is still hindered by the insufficient sodium storage capacity and depressed rate property,which are mainly induced by the undesirable pseudographitic ***,we develop a molten-salt-mediated strategy to regulate the pseudographitic structure of hard carbon with suitable interlayer spacing and enlarged pseudographitic domain,which is conducive to the intercalation capacity and diffusion kinetics of sodium ***,the optimized hard carbon anode delivers a high reversible capacity of 320 mAh·g^(−1),along with superior rate property(138 mAh·g−1 at 2 A·g^(−1))and stable cyclability over 1800 ***,the in situ Raman spectroscopic study and full-cell assembly further investigate the sodium storage mechanism and practical implement of obtained hard *** work pioneers a low-cost and effective route to regulate the pseudographitic structure of hard carbon materials for advanced SIBs.

关键词： pseudographitic structure molten salt hard carbon anode sodium-ion batteries

In situ construction of a stable composite solid electrolyte interphase for dendrite-free Zn batteries

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2023年第4期79卷 450-458页

作者： Yiming Zhao Huanyan Liu Yu Huyan Da Lei Na Li Shan Tian jian-gan Wang State Key Laboratory of Solidification Processing Center for Nano Energy MaterialsSchool of Materials Science and EngineeringNorthwestern Polytechnical University and Shaanxi Joint Lab of Graphene(NPU)Xi’an 710072ShaanxiChina

Building a stable solid electrolyte interphase(SEI)has been regarded to be highly effective for mitigating the dendrite growth and parasitic side reactions of Zn ***,a robust inorganic composite SEI layer is in situ constructed by introducing an organic cysteine additive to achieve long lifetime Zn metal *** chemisorbed cysteine derivatives are electrochemically reduced to trigger a local alkaline environment for generating a gradient layered zinc hydroxide based multicomponent *** a unique interphase is of significant advantage as a corrosion inhibitor and Zn^(2+)modulator to enable reversible plating/stripping chemistry with a reduced desolvation energy ***,the cells with a thin glass fiber separator(260μm)deliver a prolonged lifespan beyond 2000 h and enhanced Coulombic efficiency of 99.5%over 450 *** work will rationally elaborate in situ construction of a desirable SEI by implanting reductive additives for dendrite-free Zn anodes.

关键词： Zn metal anode Electrolyte additive Solid electrolyte interphase Aqueous Zn batteries

Transcutaneous Electrical Acupoint Stimulation Improves Postoperative Cognitive Function in Senior Patients Undergoing Video-Assisted Thoracoscopic Surgery:A Randomized Controlled Trial

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Integrative Medicine 2022年第8期28卷 730-735页

作者： WEI Hua HUANG Jun-sheng ZHAO Fang XIE Zhi-qiang XIA Zhi-yang gan jian-hui Department of Anesthesiology Tangshan People’s HospitalTangshanHebei Province063000China Department of Anesthesiology Tangshan Central HospitalTangshanHebei Province063000China

Objective:To evaluate the effectiveness and safety of transcutaneous electrical acupoint stimulation(TEAS)for improving postoperative cognitive function in senior patients undergoing video-assisted thoracoscopic surgical(VATS).Methods:From January to December 2020,97 participants were randomly assigned to the TEAS group(49 cases)and the control group(48 cases)by a random number *** patients in the TEAS group received TEAS,at the bilateral Neiguan(PC 6)and Zusanli(ST 36)*** control group received sham *** stimulation was started from 30 min before surgery until the end of the *** primary outcome was the incidence of pstoperative cognitive dysfunction(POCD),diagnosed based on the changes in the Mini-Mental Status Examination(MMSE)and Montreal Cognitive Assessment(MoCA)*** secondary outcomes were plasma levels of S100β protein and neuron-specific enolase(NSE).Results:The incidence of POCD on day 1 and 3 after surgery in the TEAS group was significantly lower than that in the control group[day 1 after surgery:28.3%(13/46)vs.52.3%(23/44),P=0.028;day 3 after surgery:21.7%(10/46)vs.40.9%(18/44),P=0.043].Compared with baseline,the MMSE and MoCA scores decreased to various extents in both *** MMSE scores on day 1,3,and 5 after surgery and MoCA scores on day 1,3,5,and 7 after surgery in the TEAS group were higher than those in the control group(all P<0.05)in both *** with baseline,the plasma levels of S100β and NSE were significantly increased at 4,8,12,24 h after surgery(all P<0.05).Compared with the control group,the plasma levels of S100β and NSE were lower in the TEAS group at 4,8,12,and 24 h after surgery(all P<0.05).No obvious adverse events were found during the ***:Application of TEAS in senior patients after VATS could reduce incidence of POCD and improve postoperative cognitive function.

关键词： transcutaneous electrical acupoint stimulation video-assisted thoracic surgery senior postoperative cognitive dysfunction