检索结果-南通市图书馆

Biomimetic Intelligence & Robotics 2022年第2期2卷 48-54页

作者： Yanqiu Zheng Longchuan Li yuxuan xiang Yuetong He Cong Yan Fumihiko Asano The School of Information Science Japan Advanced Institute of Science and TechnologyIshikawa 923-1292Japan The College of Information Science and Technology Beijing University Of Chemical TechnologyBeijing 100029China

The friction force is an important environmental factor that influences dynamic walking.While most of the related works simply assume static friction or Coulomb friction,we use the LuGre friction,which accounts for both static and dynamic effects,to model the horizontal ground reaction force of passive dynamic walking.We present a detailed mathematical modeling method and perform numerical simulations using it.Furthermore,we analyze the ground surface cases of the Coulomb friction condition and static friction condition to verify the model’s generalization.We discover the required condition for the existence of the period-1 gait through investigation.Our mathematical model and theoretical analysis add to our understanding of passive dynamic walking,which helps to positively utilize the natural dynamics of the legged locomotion system in control design.

关键词： Bipedal robot Passive dynamic walking LuGre friction model

Sieving carbons promise practical anodes with extensible low-potential plateaus for sodium 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

National Science Review 2022年第8期9卷 118-126页

作者： Qi Li xiangsi Liu Ying Tao Jianxing Huang Jun Zhang Chunpeng Yang Yibo Zhang Siwei Zhang Yiran Jia Qiaowei Lin yuxuan xiang Jun Cheng Wei Lv Feiyu Kang Yong Yang Quan-Hong Yang Nanoyang Group State Key Laboratory of Chemical EngineeringSchool of Chemical Engineering and TechnologyTianjin University Nanoyang Group Joint School of National University of Singapore and Tianjin UniversityInternational Campus of Tianjin University Haihe Laboratory of Sustainable Chemical Transformations State Key Laboratory of Physical Chemistry of Solid Surfaces Collaborative Innovation Center of Chemistry for Energy Materials and Department of ChemistryCollege of Chemistry and Chemical EngineeringXiamen University Shenzhen Key Laboratory for Graphene-Based Materials Engineering Laboratory for Functionalized Carbon MaterialsTsinghua Shenzhen International Graduate SchoolTsinghua University

Non-graphitic carbons are promising anode candidates for sodium-ion batteries, while their variable and complicated microstructure severely limits the rational design of high-energy carbon anodes that could accelerate the commercialization of sodium-ion batteries, as is the case for graphite in lithium-ion batteries.Here, we propose sieving carbons, featuring highly tunable nanopores with tightened pore entrances, as high-energy anodes with extensible and reversible low-potential plateaus(<0.1 V). It is shown that the tightened pore entrance blocks the formation of the solid electrolyte interphase inside the nanopores and enables sodium clustering to produce the plateau. Theoretical and spectroscopic studies also show that creating a larger area of sodiophilic pore surface leads to an almost linearly increased number of sodium clusters, and controlling the pore body diameter guarantees the reversibility of sodium cluster formation,producing a sieving carbon anode with a record-high plateau capacity of 400 mAh g–1. More excitingly, this approach to preparing sieving carbons has the potential to be scalable for modifying different commercial porous carbons.

关键词： sodium-ion batteries sieving carbons low-potential plateau pore entrance diameter pore surface area

Exploring high-voltage fluorinated carbonate electrolytes for LiNi0.5Mn1.5O4 cathode in Li-ion batteries

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2020年第3期29卷 62-70页

作者： Xi Zheng Ying Liao Zhongru Zhang Jianping Zhu Fucheng Ren Huajin He yuxuan xiang Yezhen Zheng Y.Yang State Key Laboratory for Physical Chemistry of Solid Surfaces Collaborative Innovation Center of Chemistry for Energy Materials(iChEM)and Department of ChemistryCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005FujianChina College of Energy Xiamen UniversityXiamen 361102FujianChina

Ethyl-(2,2,2-trifluoroethyl)carbonate(ETFEC)is investigated as a solvent component in high-voltage electrolytes for LiNi0.5Mn1.5O4(LNMO).Our results show that the self-discharge behavior and the high temperature cycle performance can be significantly improved by the addition of 10%ETFEC into the normal carbonate electrolytes,e.g.,the capacity retention improved from 65.3%to 77.1%after 200 cycles at 60℃.The main reason can be ascribed to the high stability of ETFEC which prevents large oxidation of the electrolyte on the cathode surface.In addition,we also explore the feasibility of electrolytes using single fluoriated-solvents with and without additives.Our results show that the cycle performance of LNMO material can be greatly improved in 1 MLiPF6+pure ETFEC-solvent system with 2 wt%ethylene carbonate(EC)or ethylene sulfate(DTD).The capacity retention of the LNMO materials is 93%after 300 cycles,even better than that of carbonate-based electrolytes.It is shown that the additives are oxidized on the surface of LNMO particles and contribute to the formation of cathode/electrolyte interphase(CEI)films.This composite CEI film plays a crucial role in suppressing the serious decomposition of the electrolyte at high voltage.

关键词： Fluorinated solvent High voltage electrolyte LiNi0.5Mn1.5O4 Interphase film Additive Lithium-ion batteries

Revealing the correlation between structure evolution and electrochemical performance of high-voltage lithium cobalt oxide

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2021年第3期30卷 786-794页

作者： Jiajia Wan Jianping Zhu yuxuan xiang Guiming Zhong xiangsi Liu Yixiao Li Kelvin H.L.Zhang Chaoyu Hong Jianming Zheng Kai Wang Yong Yang Collaborative Innovation Center of Chemistry for Energy Materials State Key Laboratory for Physical Chemistry of Solid SurfaceCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005FujianChina Xiamen Institute of Rare Earth Materials Haixi InstitutesChinese Academy of SciencesXiamen 361021FujianChina Department of Chemical and Biochemical Engineering College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005FujianChina Ningde Amperex Technology Ltd Ningde 352100FujianChina School of Energy Xiamen UniversityXiamen 361005FujianChina

Lithium cobalt oxide(LCO)is the dominating cathode materials for lithium-ion batteries(LIBs)deployed in consumer electronic devices for its superior volumetric energy density and electrochemical performances.The constantly increasing demands of higher energy density urge to develop high-voltage LCO via a variety of strategies.However,the corresponding modification mechanism,especially the influence of the long-and short-range structural transitions at high-voltage on electrochemical performance,is still not well understood and needs further exploration.Based on ss-NMR,in-situ X-ray diffraction,and electrochemical performance results,it is revealed that the H3 to H1-3 phase transition dictates the structural reversibility and stability of LCO,thereby determining the electrochemical performance.The introduction of La and Al ions could postpone the appearance of H1-3 phase and induce various types of local environments to alleviate the volume variation at the atomic level,leading to better reversibility of the H1-3 phase and smaller lattice strain,and significantly improved cycle performance.Such a comprehensive long-range,local,and electronic structure characterization enables an in-depth understanding of the structural evolution of LCO,providing a guiding principle for developing high-voltage LCO for high energy density LIBs.

关键词： Lithium cobalt oxide High-voltage In-situ XRD Solid-state NMR Structure change

Numerical Investigation on the Heat Transfer Characteristics of Supercritical Water in a Non-Uniformly Heated Tube for a Supercritical CFB Boiler

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2023年第5期32卷 1807-1818页

作者： DU Xiaocheng SONG Yuanyuan xiang yuxuan ZHOU Yanjun WANG Aoyu YANG Dong State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong UniversityXi'an 710049China

In this paper,a numerical model was built by ANSYS FLUENT to investigate the heat transfer performances of supercritical water in a circumferential non-uniformly heated vertical tube.The Shear Stress Transport(SST)k-ωmodel was adopted for describing turbulence.The operating parameters are chosen according to a 660 MW ultra-supercritical CFB boiler.The heat transfer performances under different operating parameters,such as boiler load,flow direction and heat flux distribution are analyzed.The temperature and heat flux on inner wall varies along the circumference and show symmetric distributions.The overall heat transfer performances at each cross section are better than the local heat transfer performance of midpoint of heating side.Flow direction has a great influence on heat transfer performance;it changes the radial distribution of axial velocity and then affects the turbulence distribution.Therefore,upward flow condition shows a better heat transfer performance.Smaller heat flux improves both the overall and local heat transfer performances.Reducing the heat flux area is not conducive to the overall heat transfer,but does not affect the local heat transfer at the midpoint of heating side.Finally,a new correlation is fitted based on the simulated results of supercritical water heat transfer with circumferential non-uniform heat flux distributions.

关键词： supercritical CFB boiler circumferential non-uniform heat flux numerical simulation heat transfer correlation

APF-GAN:Exploring asymmetric pre-training and fine-tuning strategy for conditional generative adversarial network

在线全文

学校读者我要写书评

暂无评论

Computational Visual Media 2024年第1期10卷 187-192页

作者： yuxuan Li Lingfeng Yang xiang Li College of Computer Science Nankai UniversityTianjinChina School of Computer Science and Engineering Nanjing University of Science and TechnologyNanjingChina

The use of generative adversarial network(GAN)-based models for the conditional generation of image semantic segmentation has shown promising results in recent years.However,there are still some limitations,including limited diversity of image style,distortion of detailed texture,unbalanced color tone,and lengthy training time.To address these issues,we propose an asymmetric pre-training and fine-tuning(APF)-GAN model.

关键词： tuning network asymmetric

基于Web of Science的低价值护理去实施化的可视化分析

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

中华现代护理杂志 2024年第13期30卷 1780-1788页

作者：向雨璇丁如吴景卢咏梅杨湘薇广州中医药大学护理学院广州510000 广州中医药大学第一附属医院护理部广州510000

目的探索国外低价值护理(LVC)去实施化领域的发展状况、研究热点及前沿。方法计算机检索Web of Science数据库核心合集1995—2023年收录的LVC去实施化的文献,利用Excel软件对文献进行整理,采用CiteSpace软件对纳入文献的作者、机构、国... 详细信息

目的探索国外低价值护理(LVC)去实施化领域的发展状况、研究热点及前沿。方法计算机检索Web of Science数据库核心合集1995—2023年收录的LVC去实施化的文献,利用Excel软件对文献进行整理,采用CiteSpace软件对纳入文献的作者、机构、国家、期刊、文献共被引情况、关键词进行可视化分析。结果共纳入576篇文献,1995—2023年发文量总体呈上升,以2022年最高(150篇),发文量居前10位且中心性>0.10的研究机构分别为哈佛大学和美国退役军人服务中心。Archives of Internal Medicine、Anesthesiology、American Review of Respiratory Disease等期刊收录文献最多,共被引频次>50且中心性>0.10的期刊为Archives of Internal Medicine、The American Journal of Medicine、British Medical Journal、Annals of Internal Medicine。除本研究检索的主题词外,576篇文献中词频>30次的关键词为"impact""management""outcome""health""quality""health care""guidelines"。关键词聚类分析中时间线延伸至近5年的聚类为"value-based care""low-value care"。突现词分析研究前沿为准确识别临床实践中存在LVC和实现各类医疗干预的LVC去实施化的干预策略。结论通过对关键词和突现词的分析发现,近年来该领域研究主题集中LVC与医疗保险支出的关系、去实施化的影响因素、识别LVC的工具(清单或手册)、临床干预路径、不同类型LVC的去实施化、去实施化的效果评价等内容上。未来国内的研究还需要加强国际合作与交流,探索和构建适宜中国的LVC去实施化路径,精准制定LVC清单和干预策略,以优化护理措施,提高医疗资源的有效利用率,为患者提供有效、高质量的护理服务。

关键词：低价值护理去实施化 CiteSpace 可视化分析

Effect of different operation conditions on PCDD/F inhibition by ammonium dihydrogen phosphate:concentrations,distributions and mechanisms

在线全文

学校读者我要写书评

暂无评论

Waste Disposal and Sustainable Energy 2024年第1期6卷 11-23页

作者： Jiayao Wu Weican xiang Xiaoxiao Wang Wenlong Song yuxuan Ying Xiaoqing Lin Xiaodong Li State Key Laboratory of Clean Energy Utilization National Engineering Laboratory of Waste Incineration Technology and EquipmentInstitute of Thermal Power Engineering of Zhejiang UniversityHangzhou310027ZhejiangChina

Phosphorus-containing compounds are considered as the potential alternatives of traditional inhibitors for suppressing the formation of polychlorinated dibenzo-p-dioxins and dibenzofurans(PCDD/Fs),but the suppression characteristics are scarcely studied.In this study,ammonium dihydrogen phosphate(ADP)was selected as the inhibitor to inhibit the PCDD/F formation via de novo synthesis at 350℃.The influence of oxygen content and addition method on PCDD/F inhibition was systematically investigated by means of statistical analysis and morphological characterization.The results showed that oxygen enhanced the formation of PCDD/Fs from 1470 ng g^(−1)(9.78 ng I-TEQ g^(−1))to 2110 ng g^(−1)(14.8 ng I-TEQ g^(−1)).ADP significantly inhibited the PCDD/F formation,with inhibition efficiencies ranging from 82.0%to 97.7%.Herein,a higher oxygen content and the premixed way intensified the suppression effect.Dibenzo-p-dioxin(DD)/dibenzofuran(DF)chlorination was proven to be effectively suppressed while chlorophenol(CP)route was not obviously influenced.With the addition of ADP,Cl source was significantly reduced and the formation of organic Cl was effectively inhibited.Also,it decreased the proportion of C–O/C=N and C=O,revealing the efficient inhibition of carbon oxidation.Meanwhile,the formation of copper phosphate and copper pyrophosphate was observed in XPS(X-ray photoelectron spectroscopy)spectra,indicating that the catalytic metal Cu was chelated and passivated by ADP.The premixed way had a better effect on reducing Cl resources,inhibiting oxidation and chelating metals,due to the direct contact with inhibitor.However,the separation method could only depend on the decomposed gases,resulting in a lower inhibition efficiency.

关键词： Ammonium dihydrogen phosphate Polychlorinated dibenzo-p-dioxins and dibenzofuran inhibition Oxygen content Adding way Mechanisms

基于情景学习理论的自我领导力课程在中医院实习护生临床培训中的应用研究

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

中医教育 2024年第1期43卷 131-139页

作者：向雨璇罗辉芳杨湘薇胡艺译刘燕燕吴蓓陈莉广州中医药大学广州510000

目的探究基于情景学习理论的教学法在中医院本科实习护生自我领导力培养的效果。方法采取便利抽样法,选取2022—2023年在广州市某大型三甲中医院本科实习护生为研究对象,共纳入60名护生。通过随机数字表法将其分为观察组和对照组,每... 详细信息

目的探究基于情景学习理论的教学法在中医院本科实习护生自我领导力培养的效果。方法采取便利抽样法,选取2022—2023年在广州市某大型三甲中医院本科实习护生为研究对象,共纳入60名护生。通过随机数字表法将其分为观察组和对照组,每组实习护生共30名。对照组实行以传统案例教学法为主的自我领导力课程进行培训,观察组则采用基于情景学习理论设计的自我领导力课程进行培训,比较干预前后2组护生自我领导力的评分,以及2组护生对课程满意度的评价。结果与对照组相比,观察组护生自我领导力得分更高(P<0.05),对课程的满意度也更高(P<0.05)。结论情境学习理论视角下的自我领导力课程更有利于本科护生自我领导力的提高。

关键词：自我领导力情境学习理论护生教育教学策略情景模拟

Tributyltin causes generational neurodevelopmental toxicity and the protective effect of folic acid in zebrafish

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2024年第3期137卷 615-625页

作者： Haoxing Cai Naying Zheng Chen Tang yuxuan Zhang Zhenghong Zuo Chengyong He State Key Laboratory of Cellular Stress Biology School of Life SciencesFaculty of Medicine and Life SciencesXiang’an Hospital of Xiamen UniversityXiamen UniversityXiamen 361005China

Tributyltin(TBT),a common organotin environmental pollutant,may pose a threat to human development during critical early-life periods.We aimed to assess the neurodevelopmental intergenerational toxicity of early-life exposure to TBT and the protective effect of DNA methyl donor folic acid(FA).Specifically,after early-life exposure(1–21 days postfertilization,dpf)to TBT(0,1,10 and 100 ng/L),zebrafish(Danio rerio)were cultured in clean medium until sexual maturity.The exposed females were mated with unexposed males to produce embryos(F1).The F1 generation were cultured(4–120 hours post-fertilization,hpf)with and without 1 mmol/L FA.The neurotoxic effects of early-life TBT exposure for zebrafish and their offspring(F1)were significantly enhanced anxiety and reduced aggression,decreased gene expression of DNA methyltransferase in the brain and increased serotonin levels in the body.Moreover,the intergenerational neurodevelopmental toxicity,as manifested in the F1 generation,was attenuated by FA supplementation.In summary,early-life TBT exposure led to intergenerational neurodevelopmental deficits in zebrafish,and DNA methyl donors had a protective effect on F1 neurodevelopment,which can inform the prevention and treatment of intergenerational neurotoxicity due to organotin pollutants.

关键词： Tributyltin Neurodevelopment Intergeneration DNA methylation Folic acid Zebrafish