检索结果-南通市图书馆

Research on Coupling Transfer Characteristics of Vibration Energy of Free Piston Linear Generator

在线全文

学校读者我要写书评

暂无评论

Journal of Beijing Institute of Technology 2020年第4期29卷 556-567页

作者： jingyi tian Huihua Feng Yifan Chen Shuochun Wang School of Mechanical Engineering Beijing Institute of TechnologyBeijing 100081China

In order to clarify the mechanism and main influencing factors of the vibration energy coupling transmission with a dual-piston structure,a thermodynamic and dynamic coupling model of the free piston linear generator(FPLG)was *** system energy conversion,vibration energy coupling transmission,and influencing factors were studied in *** coupling transmission paths and the secondary influence mechanism from in-cylinder combustion on vibration energy transmission were *** addition,the influence of the movement characteristics of the dual-piston on the vibration energy transmission was studied,and the typical parameter variation law was obtained,which provides theoretical guidance for the subsequent vibration reduction design of the FPLG.

关键词： free piston linear generator(FPLG) coupled motion of dual-piston vibration energy transfer mechanism analysis of influencing factors

Unravelling the critical role of surface Nafion adsorption in Ptcatalyzed oxygen reduction reaction by in situ electrical transport spectroscopy

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2022年第11期65卷 2290-2298页

作者： Yamei Sun jingyi tian Zhangyan Mu Bailin tian Qiulan Zhou Cheng Liu Shengtang Liu Qiang Wu Mengning Ding Key Laboratory of Mesoscopic Chemistry of MOE State Key Laboratory of Analytical Chemistry for Life SciencesSchool of Chemistry and Chemical EngineeringNanjing UniversityNanjing210023China

Solid-state ionic conductor is a vital part in all electrochemical energy conversion devices. As a widely-applied protonconducting polymer and stabilizer for electrode preparation, Nafion has key applications in electrochemical devices operated under acidic conditions. Specific adsorption of Nafion on the catalyst surface is considered to result in partial loss of intrinsic activity in reactions such as oxygen reduction reaction(ORR), due to its comprehensive occupation of active sites. Many in situ characterization methods such as voltammetric fingerprinting and spectroscopic approaches have been used to explore the dynamic adsorption of Nafion on the electrode surface. However, most of current efforts have been focused on the behaviors of Nafion itself, with little attention paid to its effects on the adsorption of surface intermediates. Here, we employed the in situ electrical transport spectroscopy(ETS) to investigate Nafion adsorption on Pt catalysts and its effects on the ORR *** findings suggest that specific adsorption of Nafion results in the increased coverage of oxygen intermediates with weaker adsorption strength, which in turn plays a critical role in the reaction selectivity. The successful application of ETS on the dynamic characterization of reaction intermediates provides a novel perspective for catalyst design in ORR-related applications in future sustainable chemistry.

关键词： electrical transport spectroscopy Nafion adsorption oxygen reduction reaction platinum hydrogen peroxide

同方期刊数据库

Ultrasmall high-entropy alloy nanoparticles on hierarchical N-doped carbon nanocages for tremendous electrocatalytic hydrogen evolution

在线全文

学校读者我要写书评

暂无评论

Nano Research 2024年第11期17卷 9518-9524页

作者： Manman Jia Jietao Jiang jingyi tian Xizhang Wang Lijun Yang Qiang Wu Zheng Hu Key Laboratory of Mesoscopic Chemistry of MOE and Jiangsu Provincial Laboratory for Nanotechnology School of Chemistry and Chemical Engineering Nanjing University Nanjing 210023 China

High-entropy alloys (HEAs) are promising candidates for the electrocatalyst of hydrogen evolution reaction (HER) due to their unique properties such as cocktail electronic effect and lattice distortion effect. Herein, the ultrasmall (sub-2 nm) nanoparticles of PtRuCoNiCu HEA with uniform element distribution are highly dispersed on hierarchical N-doped carbon nanocages (hNCNC) via low-temperature thermal reduction, denoted as us-HEA/hNCNC. The optimal us-HEA/hNCNC exhibits excellent HER performance in 0.5 M H_(2)SO4 solution, achieving an ultralow overpotential of 19 mV at 10 mA·cm^(−2) (without iR-compensation), high mass activity of 13.1 A·mgnoble metals ^(−1) at −0.10 V and superb stability with a slight overpotential increase of 3 mV after 20,000 cycles of cyclic voltammetry scans, much superior to the commercial Pt/C (20 wt.%). The combined experimental and theoretical studies reveal that the Pt&Ru serve as the main active sites for HER and the CoNiCu species modify the electron density of active sites to facilitate the H* adsorption and achieve an optimum M-H binding energy. The hierarchical pore structure and N-doping of hNCNC support also play a crucial role in the enhancement of HER activity and stability. This study demonstrates an effective strategy to greatly improve the HER performance of noble metals by developing the HEAs on the unique hNCNC support.

关键词： high-entropy alloys acidic hydrogen evolution ultrasmall nanoparticles hierarchical carbon nanocages high activity

Self-supported NiFe-LDH nanosheets on NiMo-based nanorods as high-performance bifunctional electrocatalysts for overall water splitting at industrial-level current densities

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

Nano Research 2024年第5期17卷 3769-3776页

作者： Yan Zhang Biao Feng MingLei Yan Zhen Shen Yiqun Chen jingyi tian Fengfei Xu Guanghai Chen Xizhang Wang Lijun Yang Qiang Wu Zheng Hu Key Laboratory of Mesoscopic Chemistry of Ministry of Education(MOE)and Jiangsu Provincial Lab for Nanotechnology School of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023China College of Water Conservancy and Hydropower Engineering Sichuan Agricultural UniversityYa’an 625014China

Efficient,durable and economic electrocatalysts are crucial for commercializing water electrolysis ***,we report an advanced bifunctional electrocatalyst for alkaline water splitting by growing NiFe-layered double hydroxide(NiFe-LDH)nanosheet arrays on the conductive NiMo-based nanorods deposited on Ni foam to form a three-dimensional(3D)architecture,which exhibits exceptional performances for both hydrogen evolution reaction(HER)and oxygen evolution reaction(OER).In overall water splitting,only the low operation voltages of 1.45/1.61 V are required to reach the current density of 10/500 mA·cm^(-2),and the continuous water splitting at an industrial-level current density of 500 mA·cm^(-2) shows a negligible degradation(1.8%)of the cell voltage over 1000 *** outstanding performance is ascribed to the synergism of the HER-active NiMo-based nanorods and the OER-active NiFe-LDH nanosheet arrays of the hybridized 3D ***,the dense NiFe-LDH nanosheet arrays enhance the local pH on cathode by retarding OH-diffusion and enlarge the electrochemically active surface area on anode,while the conductive NiMo-based nanorods on Ni foam much decrease the charge-transfer resistances of both *** study provides an efficient strategy to explore advanced bifunctional electrocatalysts for overall water splitting by rationally hybridizing HER-and OER-active components.

关键词： alkaline water splitting bifunctional electrocatalysts layered double hydroxides high durability industrial current densities

Hundredfold increase of stimulated Brillouin-scattering bandwidth in whispering-gallery mode resonators

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

Photonics Research 2023年第6期11卷 917-924页

作者： GUOPING LIN jingyi tian TANG SUN QINGHAI SONG YANNE K.CHEMBO Ministry of Industry and Information Technology Key Laboratory of Micro-Nano Optoelectronic Information System School of ScienceHarbin Institute of TechnologyShenzhen 518055China Guangdong Provincial Key Laboratory of Semiconductor Optoelectronic Materials and Intelligent Photonic Systems Shenzhen 518055China Department of Electrical and Computer Engineering&Institute for Research in Electronics and Applied Physics(IREAP) University of MarylandCollege ParkMaryland 20742USA

Backward stimulated Brillouin scattering(SBS)is widely exploited for various applications in optics and *** typically features a narrow gain bandwidth of a few tens of megahertz in fluoride *** we report a hundredfold increase of SBS bandwidth in whispering-gallery mode *** crystalline orientation results in a large variation of the acoustic phase velocity upon propagation along the periphery,from which a broad Brillouin gain is *** 2.5 GHz wide Brillouin gain profile is theoretically found and experimentally *** phenomena with Brillouin shift frequencies ranging from 11.73 to 14.47 GHz in ultrahigh Q Z-cut magnesium fluoride cavities pumped at the telecommunication wavelength are ***,the Brillouin-Kerr comb in this device is *** 400 comb lines spanning across a spectral window of 120 nm are *** finding paves a new way for tailoring and harnessing the Brillouin gain in crystals.

关键词： scattering pumped Brillouin

“One stone, two birds”: Salt template enabling porosity engineering and single metal atom coordinating toward high-performance zinc-ion capacitors

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2025年第1期100卷 637-645页

作者： Chunliu Zhu Huanyu Liang Ping Li Chenglong Qiu jingyi Wu Jingwei Chen Weiqian tian Yue Zhu Zhi Li Huanlei Wang School of Materials Science and Engineering Ocean University of China Department of Chemical and Materials Engineering University of Alberta

Zinc-ion hybrid capacitors （ZIHCs） have received increasing attention as energy storage devices owing to their low cost,high safety,and environmental ***,their progress has been hampered by low energy and power density,as well as unsatisfactory long-cycle stability,mainly due to the lack of suitable electrode *** this context,we have developed manganese single atoms implanted in nitrogen-doped porous carbon nanosheets （MnSAs/NCNs） using a metal salt template method as cathodes for *** metal salt serves a dual purpose in the synthesis process:It facilitates the uniform dispersion of Mn atoms within the carbon matrix and acts as an activating agent to create the porous *** applied in ZIHCs,the MnSAs/NCNs electrode demonstrates exceptional performance,including a high capacity of 203 m Ah g-1,an energy density of 138 Wh kg-1at 68 W kg-1,and excellent cycle stability with 91%retention over 10,000 *** calculations indicate that the introduced Mn atoms modulate the local charge distribution of carbon materials,thereby improving the electrochemical *** work demonstrates the significant potential of carbon materials with metal atoms in zinc-ion hybrid capacitors,not only in enhancing electrochemical performance but also in providing new insights and methods for developing high-performance energy storage devices.

关键词： Zinc ion hybrid capacitors Cathodes Carbon materials Heteroatoms Single atoms

中西医结合治疗儿童传染性单核细胞增多症的临床研究进展

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

中国基层医药 2020年第5期27卷 637-640页

作者：田净忆蚌埠市第一人民医院儿科安徽省233000

对儿童传染性单核细胞增多症(IM)从病因病机、分型论治、分期论治、专方专用、专法专药、中成药、中医外治法等分别展开论述,综合近些年来中西医结合治疗儿童传染性单核细胞增多症的概况,为临床治疗IM提供新思路。

关键词：传染性单核细胞增多症医学,中国传统综述儿童

在线全文

学校读者我要写书评

暂无评论

基于振声数值模拟的柴油机响度分析与优化

内燃机学报 2019年第2期37卷 164-170页

作者：杨征葳冯慧华田静宜北京理工大学机械与车辆学院北京100081

传统的柴油机噪声评价基于样机试验结果,以A声级和辐射声功率为主要指标,未考虑人耳的听音特点.为解决以上问题,在柴油机的建模仿真阶段,利用响度模型进行噪声评价与优化,增加了声学预测的有效性,提高了柴油机振声设计的水平.通过有限... 详细信息

传统的柴油机噪声评价基于样机试验结果,以A声级和辐射声功率为主要指标,未考虑人耳的听音特点.为解决以上问题,在柴油机的建模仿真阶段,利用响度模型进行噪声评价与优化,增加了声学预测的有效性,提高了柴油机振声设计的水平.通过有限元法和自动匹配层(AML)法,得到了某16 V型船用柴油机的外声场声压分布和各部件的声功率贡献量.利用Moore模型分析了主要声场点的响度特性,完成了对油底壳的结构改进.改进后柴油机在分析频域内的特征响度和声功率均明显降低,验证了响度评价和优化方法的可行性.

关键词：柴油机振声设计辐射声功率特征响度 Moore模型

在线全文

学校读者我要写书评

暂无评论

尘螨过敏原硝基化的位点选择性分析

环境化学 2023年第7期42卷 2273-2281页

作者：田婧宜杨方星浙江大学环境与资源学院环境健康研究所污染环境修复与生态健康教育部重点实验室杭州310058 浙江大学空气污染与健康研究中心杭州310058

过敏原的硝基化会引起其致敏潜能的增强,进而带来更大的致敏性健康风险.过敏原蛋白质通常含有多个酪氨酸硝基化位点,分析过敏原硝基化的位点选择性是探究硝基化对过敏原致敏性影响的重要基础.本文以尘螨过敏原为研究对象,建立了基于超... 详细信息

过敏原的硝基化会引起其致敏潜能的增强,进而带来更大的致敏性健康风险.过敏原蛋白质通常含有多个酪氨酸硝基化位点,分析过敏原硝基化的位点选择性是探究硝基化对过敏原致敏性影响的重要基础.本文以尘螨过敏原为研究对象,建立了基于超高效液相色谱-串联质谱(UPLC-MS/MS)同时定量分析3种尘螨过敏原(Der f 1、Der p 1和Der p 2)的13个酪氨酸位点硝基化程度的方法,并应用于分析3种尘螨过敏原在过氧亚硝酸盐硝基化作用下的位点选择性.结果表明,3种尘螨过敏原均发生了位点特异性的硝基化,Y195、Y37和Y92分别为Der f 1、Der p 1和Der p 2中反应活性最高的硝基化位点.尘螨过敏原位点选择性的硝基化表明,在评价硝基化尘螨过敏原的致敏性变化时应当考虑其位点特异性的硝基化状况.

关键词：尘螨过敏原酪氨酸硝基化位点选择性液相色谱-串联质谱.

维普期刊数据库博看期刊