检索结果-南通市图书馆

Highly active Fe_(7)S_(8) encapsulated in N-doped hollow carbon nanofibers for high-rate sodium-ion batteries

Journal of Energy Chemistry 2021年第2期30卷 26-35,I0002页

作者： Chengzhi Zhang Donghai Wei Fei Wang Guanhua Zhang junfei duan Fei Han Huigao duan Jinshui Liu Hunan Province Key Laboratory for Advanced Carbon Materials and Applied Technology College of Materials Science and EngineeringHunan UniversityChangsha 410082HunanChina State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body College of Mechanical and Vehicle EngineeringHunan UniversityChangsha 410082HunanChina School of Materials Science and Engineering Changsha University of Science and TechnologyChangsha 410004HunanChina

Nanostructured iron sulfides are regarded as a potential anode material for sodium-ion batteries in virtue of the rich natural abundance and remarkable theoretical ***,poor rate performance and inferior cycling stability caused by sluggish kinetics and volume swelling represent two main obstacles at present. The previous research mainly focuses on nanostructure design and/or hybridizing with conductive *** boosting the property by adjusting Fe/S atomic ratio in iron sulfides is rarely *** this work,Fe_7 S_8 and FeS_2 encapsulated in N-doped hollow carbon fibers(NHCFs/Fe_7 S_8 and NHCFs/FeS_2) are constructed by a combined chemical bath deposition and subsequent sulfidation *** well-designed NHCFs/Fe_(7) S_(8) electrode displays a remarkable capacity of 517 mAh g^(-1) at 2 A g^(-1)after 1000 cycles and a superb rate capability with a capability of 444 mAh g^(-1) even at 20 A g^(-1) in etherbased ***,the rate capability of NHCFs/Fe_(7) S_(8) is superior to that of the contrast NHCFs/FeS_(2) electrode and also much better than the values of the most previously reported iron sulfide-based *** in-depth mechanism explanation is explained by further experimental analysis and theoretical calculation,revealing Fe_(7) S_(8) displays improved intrinsic electronic conductivity and faster Na^(+) diffusion coefficient as well as higher reaction reversibility.

关键词： Sodium-ion batteries Anode High rate Iron sulfides N-doped hollow carbon fibers

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Semi-closed synthesis of nitrogen and oxygen Co-doped mesoporous carbon for selective aqueous oxidation

引用

Green Energy & Environment 2022年第1期7卷 43-52页

作者： Chen Xing Daihui Yang Yan Zhang Tian Sun junfei duan Hussein A.Younus Shiguo Zhang College of Materials Science and Engineering Hunan Province Key Laboratory for Advanced Carbon Materials and Applied TechnologyHunan UniversityChangsha410082China School of Materials Science and Engineering Changsha University of Science and TechnologyChangsha410004China Chemistry Department Faculty of ScienceFayoum UniversityFayoum63514Egypt

Heteroatom-doped meso/micro-porous carbon materials are conventionally produced by harsh carbonization under an inert atmosphere involving specific precursors,hard/soft templates,and heteroatom-containing ***,we report a facile synthesis of N and O co-doped meso/micro-porous carbon(NOMC)by template-free carbonization of a small-molecule precursor in a semi-closed *** semi-closed carbonizaiton process yields hydrophilic NOMCs with large surface area in a high *** porous structure as well as the elemental composition of NOMCs can be modulated by changing the holding time at a particular *** as metal-free heterogeneous catalysts can selectively oxidize benzyl alcohol and its derivatives into aldehydes/ketones with>85%conversion in aqueous solution,which is much higher than that of the control sample obtained in tube furnace(21%conversion),mainly due to their high N content,high percentage of pyridinic N,and large surface *** presence of O-containing moieties also helps to improve the hydrophilicity and dispersion ability of catalysts and thus facilitates the mass transfer process during aqueous *** NOMC catalysts also dispayed excellent activity for a wide range of substrates with a selectivity of>99%.

关键词： Semi-closed carbonization Nitrogen and oxygen doping Mesoporous carbon Metal-free catalyst Selective aqueous oxidation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Free-standing phosphorous-doped molybdenum nitride in 3D carbon nanosheet towards hydrogen evolution at all pH values

引用

Journal of Energy Chemistry 2020年第11期29卷 44-51页

作者： Qiyou Wang Yan Zhang Wenpeng Ni Yi Zhang Tian Sun Jiaheng Zhang junfei duan Yang Gao Shiguo Zhang College of Materials Science and Engineering Hunan Province Key Laboratory for Advanced Carbon Materials and Applied TechnologyHunan UniversityChangsha 410082HunanChina School of Materials Science and Engineering Harbin Institute of TechnologyShenzhen 518055GuangdongChina School of Materials Science and Engineering Changsha University of Science and TechnologyChangsha 410004HunanChina

Highly efficient electrocatalysts towards hydrogen evolution reaction(HER) with large current density at all-pH values are critical for the sustainable hydrogen production. Herein, we report a free-standing HER electrode, phosphorous-doped molybdenum nitride nanoparticles embedded in 3-dimentional carbon nanosheet matrix(P-Mo2N-CNS) fabricated via one-step carbonization and in-situ formation. The asprepared catalyst shows free-standing architecture with interconnected porous microstructure. P-doped Mo2N nanoparticles with an average diameter of 4.4 nm are well embedded in the 3-dimentional vertical carbon nanosheets matrix. Remarkable electrocatalytic HER performance is observed in alkaline, neutral and acidic media at large current densities. The overpotential of P-Mo2N-CNS to drive a current density of 100 mA cm-2 in 0.5 M H2SO4 and 1.0 M PBS is only 181 and 221 mV, respectively. In particular, the current density reaches up to 1000 mA cm-2 at a low overpotential of 256 mV in 1.0 M KOH, much better than that of the commercial Pt/C catalyst. Density functional theory calculations suggest the optimized H sorption kinetics on Mo2N after P doping, elucidating the superior activity.

关键词： Hydrogen evolution reaction Molybdenum nitride Heteroatoms doping Free-standing catalyst DFT calculations

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Direct ink writing of programmable functional silicone-based composites for 4D printing applications

引用

Interdisciplinary Materials 2022年第4期1卷 507-516页

作者： Zhiyang Lyu J.ustin Koh Gwendolyn J.H.Lim Danwei Zhang Ting Xiong Lei Zhang Siqi Liu junfei duan Jun Ding John Wang Jinlan Wang Yunfei Chen Chaobin He Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments School of Mechanical EngineeringSoutheast UniversityNanjingChina Department of Materials Science and Engineering National University of SingaporeSingaporeSingapore Agency for Science Technologyand Research(A*STAR)Institute of Materials Research and EngineeringSingaporeSingapore School of Materials Science and Engineering Changsha University of Science and TechnologyChangshaChina School of Physics Southeast UniversityNanjingChina

Polydimethylsiloxane(PDMS)has been widely used in flexible electronics,soft robotics,and ***,the fabrication of PDMS-based devices has mostly relied on conventional approaches,such as casting and molding,thereby limiting their *** we fabricate PDMS-based composites with programmable microstructures by direct ink writing and realize their practical functionalities of four-dimensional(4D)*** mechanical,thermomechanical and magnetic properties of the three-dimensional-printed composites can be well tailored by using carbon,metal,or ceramic functional *** taking advantage of the printable,flexible,and magnetic PDMS composites,we demonstrate new practical functionalities of 4D printing by designing programmable architectures,including magnetic-field-driven battery cases and patchworks,as well as arbitrary morphing ceramic *** particular,4D-printed batteries are constructed by PDMS-based battery cases for the first time,which can be actuated via external magnetic *** study broadens the paradigm of 4D printing for prospective applications,such as implant batteries,biomimetic engineering,and customized biomedical devices.

关键词： 4D printing 4D-printed batteries direct ink writing PDMS polymer-derived ceramics

来源：

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

基于ANSYS的不锈钢起重机桥架优化与有限元分析

引用

煤矿机械 2022年第3期43卷 116-119页

作者：李永福段君飞河南卫华重型机械股份有限公司河南新乡453400

借助有限元分析工具对原设计0.5 t不锈钢起重机桥架结构进行建模和仿真分析,认为原结构制造工艺较复杂、成本较高。提出优化方案及新的设计结构,对比优化前后桥架的主要力学性能参数,验证新方案的优越性,为其他轻量化不锈钢起重机桥架... 详细信息

借助有限元分析工具对原设计0.5 t不锈钢起重机桥架结构进行建模和仿真分析,认为原结构制造工艺较复杂、成本较高。提出优化方案及新的设计结构,对比优化前后桥架的主要力学性能参数,验证新方案的优越性,为其他轻量化不锈钢起重机桥架结构的设计和分析提供了一种有效的方法。

关键词：不锈钢起重机桥架有限元仿真分析优化设计

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Prediction of NO_(x)concentration using modular long short-term memory neural network for municipal solid waste incineration

引用

Chinese Journal of Chemical Engineering 2023年第4期56卷 46-57页

作者： Haoshan duan Xi Meng Jian Tang junfei Qiao Faculty of Information Technology Beijing University of TechnologyBeijing 100124China Beijing Laboratory of Smart Environmental Protection Beijing 100124China Beijing Key Laboratory of Computational Intelligence and Intelligent System Beijing 100124China Engineering Research Center of Intelligence Perception and Autonomous Control Ministry of Education Beijing 100124China

Air pollution control poses a major problem in the implementation of municipal solid waste incineration(MSWI).Accurate prediction of nitrogen oxides(NO_(x))concentration plays an important role in efficient NO_(x)emission *** this study,a modular long short-term memory(M-LSTM)network is developed to design an efficient prediction model for NO_(x)***,the fuzzy C means(FCM)algorithm is utilized to divide the task into several sub-tasks,aiming to realize the divide-and-conquer ability for complex ***,long short-term memory(LSTM)neural networks are applied to tackle corresponding sub-tasks,which can improve the prediction accuracy of the ***,a cooperative decision strategy is designed to guarantee the generalization performance during the testing or application ***,after being evaluated by a benchmark simulation,the proposed method is applied to a real MSWI *** the experimental results demonstrate the considerable prediction ability of the M-LSTM network.

关键词： Municipal solid waste incineration NO_(x)concentration prediction Modular neural network Model

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

“三全育人”格局下高校研究生创新精神的提升策略

引用

科教导刊 2020年第27期 5-6页

作者：李灵均王微蒋琳嫒段军飞长沙理工大学材料科学与工程学院湖南长沙410114 长沙理工大学物理与电子科学学院湖南长沙410114

研究生教育处于国民教育体系顶端,其创新能力关系着高校服务社会能力,关系着国家创新驱动发展战略。本文立足"三全育人",依托导师团队建设、联合支部建设、课程思政教育、高水平成果评价和导向机制建设的"三建三改"提升策略,开展研究生... 详细信息

研究生教育处于国民教育体系顶端,其创新能力关系着高校服务社会能力,关系着国家创新驱动发展战略。本文立足"三全育人",依托导师团队建设、联合支部建设、课程思政教育、高水平成果评价和导向机制建设的"三建三改"提升策略,开展研究生创新精神的探索与实践研究,为有效增强高校研究生的理想信念和创新能力提供新蹊径,同时对提高高校研究生培养质量以及建设高水平大学及重点学科具有重要的理论意义。

关键词：三全育人研究生创新精神三建三改

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

ICU多发伤患者合并肺部感染原因分析与治疗对策

引用

中国继续医学教育 2017年第22期9卷 155-156页

作者：段俊斐何永辉罗欣民王松官郑金国夏维海江苏省兴化市人民医院ICU 江苏兴化225700

目的对ICU多发伤患者伴发肺部感染的原因及临床治疗方法展开分析与研究。方法选取2013年1月—2016年12月本院ICU收治的45例多发伤伴发肺部感染患者,回顾性分析临床资料,以了解肺部感染具体原因及临床治疗对策。结果 45例患者肺部感染原... 详细信息

目的对ICU多发伤患者伴发肺部感染的原因及临床治疗方法展开分析与研究。方法选取2013年1月—2016年12月本院ICU收治的45例多发伤伴发肺部感染患者,回顾性分析临床资料,以了解肺部感染具体原因及临床治疗对策。结果 45例患者肺部感染原因涉及:创伤/原发伤后急救、误吸、侵入性操作、手术干预及治疗、抗生素应用不合理等;治疗后,抢救无效死亡7例,好转出院38例。结论临床经回顾性分析且了解ICU多发伤患者伴发肺部感染的原因后,对具体原因展开治疗,如原发伤治疗、早期气管切开、呼吸辅助支持、呼吸道管理、合理应用抗生素等,均可有效防治肺部感染。

关键词：多发伤合并肺部感染原因治疗对策

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A Silicon Monoxide Lithium-Ion Battery Anode with Ultrahigh Areal Capacity

引用

Nano-Micro Letters 2022年第3期14卷 229-243页

作者： Jiang Zhong Tao Wang Lei Wang Lele Peng Shubin Fu Meng Zhang Jinhui Cao Xiang Xu junfei Liang Huilong Fei Xidong duan Bingan Lu Yiliu Wang Jian Zhu Xiangfeng duan State Key Laboratory for Chemo/Biosensing and Chemometrics College of Chemistry and Chemical EngineeringSchool of Physics and ElectronicsHunan Key Laboratory of Two‑Dimensional MaterialsEngineering Research Center of Advanced Catalysis of the Ministry of EducationHunan UniversityChangsha 410082People’s Republic of China International Graduate School at Shenzhen Tsinghua UniversityShenzhen 518057People’s Republic of China Key Laboratory of Structures Dynamic Behavior and Control of the Ministry of Education Key Laboratory of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information TechnologyHarbin Institute of TechnologyHarbin 150090People’s Republic of China School of Energy and Power Engineering North University of ChinaTaiyuan 030051People’s Republic of China Department of Chemistry and Biochemistry University of CaliforniaLos AngelesCA 90095USA

Silicon monoxide(SiO)is an attractive anode material for next-generation lithium-ion batteries for its ultra-high theoretical capacity of 2680 mAh g−*** studies to date have been limited to electrodes with a rela-tively low mass loading(<3.5 mg cm^(−2)),which has seriously restricted the areal capacity and its potential in practical *** areal capacity with such high-capacity materials is critical for capitalizing their potential in practi-cal ***,we report a monolithic three-dimensional(3D)large-sheet holey gra-phene framework/SiO(LHGF/SiO)composite for high-mass-loading *** specifically using large-sheet holey graphene building blocks,we construct LHGF with super-elasticity and exceptional mechanical robustness,which is essential for accommodating the large volume change of SiO and ensuring the structure integrity even at ultrahigh mass ***,the 3D porous graphene network structure in LHGF ensures excellent electron and ion *** systematically tailoring microstructure design,we show the LHGF/SiO anode with a mass loading of 44 mg cm^(−2)delivers a high areal capacity of 35.4 mAh cm^(−2)at a current of 8.8 mA cm^(−2)and retains a capacity of 10.6 mAh cm^(−2)at 17.6 mA cm^(−2),greatly exceeding those of the state-of-the-art commercial or research ***,we show an LHGF/SiO anode with an ultra-high mass loading of 94 mg cm^(−2)delivers an unprecedented areal capacity up to 140.8 mAh cm^(−2).The achievement of such high areal capacities marks a critical step toward realizing the full potential of high-capacity alloy-type electrode materials in practical lithium-ion batteries.

关键词： Silicon monoxide Large-sheet holey graphene Lithium-ion batteries High mass loading Ultra-high areal capacity

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Highly oxygenated dihydrostilbenoids and flavones from the aerial part of Glycyrrhiza uralensis and their antimicrobial activities

引用

Science of Traditional Chinese Medicine 2024年第4期2卷 291-302页

作者： Xinyi Wei junfei Zhou Liping Zeng Mingming Xu Chuntao Che Jin’ao duan Hui Yan Hongkai Bi Ming Zhao Jiangsu Collaborative Innovation Centre of Chinese Medicinal Resources Industrialization National and Local Collaborative Engineering Center of Chinese Medicinal Resources Industrialization and Formulae Innovative MedicineSchool of PharmacyNanjing University of Chinese MedicineNanjingChina Department of Pharmaceutical Sciences College of Pharmacythe University of Illinois ChicagoChicagoILUSA Department of Pathogen Biology Jiangsu Key Laboratory of Pathogen BiologyNanjing Medical UniversityNanjingChina

Background:Multidrug-resistant bacteria(MDRB)represent a significant global challenge due to their high mortality rates,substantial economic burden,and rapid *** triple or quadruple therapies have demonstrated limited efficacy as a result of increasing drug ***,it is urgent to develop novel anti-MDRB drugs with high efficiency and low ***:To isolate and identify the dihydrostilbenoids and flavones from the aerial part of Glycyrrhiza uralensis(Fabaceae)and to screen their antimicrobial *** and methods:The aerial part of *** was extracted with 75%aqueous *** crude extract was repeatedly isolated by macroporous resin,silica gel,Sephadex LH-20,C_(18)-MPLC,and MCI-MPLC,which were then purified by semipreparative RPHPLC to obtain monomer *** structures of the isolates were assigned by a combination of optical rotations,UV spectra,nuclear magnetic resonance,and high-resolution electrospray ionization mass spectrometry,and the absolute configurations of compounds 2,3,and 7 were further confirmed by electronic circular dichroism ***,we investigated their antimicrobial activities by the broth microdilution ***:Seventeen previously undescribed phenolic compounds(1–17)and 26 known analogs(18–43),including dihydrostilbenoids,flavones,and dihydroflavones,were identified from the aerial part of *** vitro,antimicrobial bioassays demonstrated that compound 31 displayed the strongest inhibitory effect against 4 drug-resistant Helicobacter pylori strains(MIC=2–4μg/mL),comparable to metronidazole(MIC=1–32μg/mL).Additionally,compounds 10,13,and 15 demonstrated bactericidal activity against Staphylococcus aureus(MIC=4μg/mL),while compounds 15 and 22 exhibited inactivation effects against Mycobacterium smegmatis,Enterococcus faecium,and ***(MIC=4–8μg/mL).Conclusions:These monomeric compounds with antimicrobial activities were isolated from the aerial parts

关键词： Phenolic compounds Electronic circular dichroism(ECD) Bactericidal activity Helicobacter pylori

来源：

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

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：