检索结果-南通市图书馆

Recent advances of metal-organic frameworks-based proton exchangemembranes in fuel cell applications

在线全文

学校读者我要写书评

暂无评论

SusMat 2022年第5期2卷 504-534页

作者： xiao-min li Junkuo Gao School of Materials Science and Engineering Institute of Functional Porous MaterialsZhejiang Sci-Tech UniversityHangzhouChina

In recent years,proton exchange membrane(PEM)fuel cell(FC;PEMFC)has been widely studied and gradually applied to vehicle power supply,portable supply,communication base station backup,emergency power supply,and so *** in new energy vehicles,PEMFC has absolute advantages and a broad ***,which is the core component of PEMFC,has a close correlation between its property and the performance of ***,developing excellent PEMs is the focus of ***–organic frameworks(MOFs)composed of metal ions/clusters and organic ligands have attracted extensive attention in the field of proton *** hybrid membranes formed by MOFs and polymers show excellent performances and design concepts,which have great prospects in commercial *** paper summarizes the research progress of MOFs-based hybrid membranes as PEMs applied in hydrogen–oxygen FCs and direct methanol FCs,in which the different polymers used as substrates are also summed up.

关键词： fuel cell hybrid membrane metal-organic framework proton exchange membrane

Preparation and application in electromagnetic absorption of ZnO/FeNiMo composite

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

Rare Metals 2014年第5期33卷 573-577页

作者： Xia-lian Zheng Zheng-Hou Zhu xiao-min li School of Materials Science and Engineering Nanchang University Physics Science and Engineering Technology Institute Yichun College

In order to increase the absorbing ability and expand the absorbing bandwidth, ZnO and FeNiMo particles were established as absorbers, and wax as adhesive, and the electromagnetic parameters were tested using a vector network analyzer, then the absorbing properties were calculated by means of transmission line theory. The ZnO/FeNiMo composite has excellent microwave absorption properties of a minimum reflection loss value-27.8 dB at 15.98 GHz for a thickness of 1.5 mm and a broad absorption bandwidth of 13.46–18 GHz（RL 〈-10 dB）.

关键词： ZnO FeNiMo Absorbing materials Absorbing property Reflection loss

The absorbing properties of Fe_(73.5) Cu_1 Nb_3Si_(13.5)B_9 amorphous powder/S-glass fiber-reinforced epoxy composite panels

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2013年第3期32卷 294-298页

作者： Xia-lian Zheng Zheng-Hou Zhu xiao-min li School of Materials Science and Engineering Nanchang University Physics Science and Engineering Technology Institute Yichun College

Fe73.5Cu1Nb3Si13.5B9 （or FeCuNbSiB） powder/ S-glass fiber-reinforced epoxy composite panels were pre- pared by mold pressing method. Metallographic analysis shows that the amorphous powders are evenly distributed between the layers of S-glass fibers. The effects of the Fe- CuNbSiB powder mass fraction on the complex permittivity, complex permeability, and microwave absorption of the composite panels have been studied in the frequency range of 2.6-18.0 GHz. The complex permittivity of the composite panels with different mass fractions of the FeCuNbSiB powders shows several peaks in the 2.6-18.0 GHz fre- quency range. The complex permeability of the composites decreases with the increasing frequency in the frequency range of 8-18 GHz. The composite with FeCuNbSiB/epoxy mass ratio of 2.5：1.0 has excellent microwave absorption properties of a minimum reflection loss value -30.5 dB at 10.93 GHz for a thickness of 2 mm. A reflection loss exceeding -10 dB can be obtained in a broad frequency range of 3.2-18.0 GHz with a thickness of 1.15-5.00 mm. For the FeCuNbSiB composites, the magnetic loss is the dominant term for microwave absorption. The FeCuNbSiB powders are a possible candidate for high-performance microwave absorption filler.

关键词： Amorphous powders Composites Permeability Permittivity Absorbing properties

Eff ects of early standardized enteral nutrition on preventing acute muscle loss in the acute exacerbation of chronic obstructive pulmonary disease patients with mechanical ventilation

在线全文

学校读者我要写书评

暂无评论

World Journal of Emergency Medicine 2023年第3期14卷 193-197页

作者： Yue li Yong-peng Xie xiao-min li Tao Lu School of International Pharmaceutical Business China Pharmaceutical UniversityNanjing 210009China Department of Emergency and Critical Care Medicine Lianyungang Clinical College of Nanjing Medical UniversityLianyungang 222000China

BACKGROUND:To investigate the eff ects of early standardized enteral nutrition(EN)on the crosssectional area of erector spine muscle(ESMcsa),plasma growth diff erentiation factor-15(GDF-15),and 28-day mortality of acute exacerbation of chronic obstructive pulmonary disease(AECOPD)patients with invasive mechanical ventilation(MV).METHODS:A total of 97 AECOPD patients with invasive MV were screened in the ICUs of the First People's Hospital of *** conventional EN group(stage Ⅰ)and early standardized EN group(stage Ⅱ)included 46 and 51 patients,*** loss and GDF-15 levels on days 1 and 7 of ICU admission and 28-day survival rates were ***:On day 7,the ESMcsa of the early standardized EN group was significantly higher than that of the conventional EN group,while the plasma GDF-15 levels were significantly lower than those in the conventional EN group(ESMcsa:28.426±6.130 cm^(2) vs.25.205±6.127 cm^(2);GDF-15:1661.608±558.820 pg/mL vs.2541.000±634.845 pg/mL;all P<0.001).The 28-day survival rates of the patients in the early standardized EN group and conventional EN group were 80.40%and 73.90%,respectively(P=0.406).CONCLUSION:ESMcsa loss in AECOPD patients with MV was correlated with GDF-15 levels,both of which indicated acute muscular atrophy and skeletal muscle *** standardized EN may prevent acute muscle loss and intensive care unit-acquired weakness(ICU-AW)in AECOPD patients.

关键词： Acute exacerbation of chronic obstructive pulmonary disease Enteral nutrition Cross-sectional area Erector spine muscle Growth diff erentiation factor-15 Intensive care unit-acquired weakness(ICU-AW) Prognosis

Vertical Price Transmission in the China's Layer Industry Chain:an Application of FDL Approach

在线全文

学校读者我要写书评

暂无评论

Agricultural Sciences in China 2011年第11期10卷 1812-1823页

作者： XU Shi-wei DONG xiao-xia li Zhe-min li Gan-qiong Key Laboratory of Digital Agricultural Early-Warning Technology Ministry of Agriculture~Agricultural Information Institute ChineseAcademy of Agricultural Sciences Beijing 100081 P.R.China

This paper examines the vertical price relationship between upstream and downstream products in China＇s layer industry chain by estimating elasticity coefficients of the price transmission. We use cointegration tests, error correction models and finite distributed lag models to analyze vertical price shifts between corn, layer feed, egg-laying chicken and egg prices. With monthly data from 1994 to 2010, our results show that various prices in China＇s layer industry chain are well integrated. In addition, our results indicate that both long-run and short-run price relationships between upstream and downstream products in layer industry chain exist and the long-run equilibrium, to a certain extent, may eliminate the short-run dynamics price deviation. We also found that the influence of corn and feed prices on egg prices is still more remarkable than egg-laying chicken prices. Our findings imply that governments should pay more attention to corn and layer feed prices in order to stabilize egg prices under the conditions of market integration.

关键词： finite distributed lag model vertical price transmission layer industry chain China

Supereulerian Graphs and the Petersen Graph

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2014年第2期30卷 291-304页

作者： xiao min li Lan LEI Hong-Jian LAI Meng ZHANG Department of Mathematics and Statistics Chongqing Technology and Business University Department of Mathematics West Virginia University College of Mathematics and System Sciences Xinjiang University

A graphG is supereulerian if G has a spanning eulerian *** et al.[*** Theory,1,79–84（1977）]proposed the problem of characterizing supereulerian *** this paper,we prove that any 3-edge-connected graph with at most 11 edge-cuts of size 3 is supereulerian if and only if it cannot be contractible to the Petersen *** extends a former result of Catlin and Lai[***,Ser.B,66,123–139（1996）].

关键词： Supereulerian graphs petersen graph edge-cut reduction contraction

Stability analysis of unsaturated soil slope during rainfall infiltration using coupled liquid-gas-solid three-phase model

在线全文

学校读者我要写书评

暂无评论

Water Science and Engineering 2016年第3期9卷 183-194页

作者： Dong-mei Sun xiao-min li Ping Feng Yong-ge Zang State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin University

Generally, most soil slope failures are induced by rainfall infiltration, a process that involves interactions between the liquid phase, gas phase,and solid skeleton in an unsaturated soil slope. In this study, a loosely coupled liquid-gas-solid three-phase model, linking two numerical codes,TOUGH2/EOS3, which is used for water-air two-phase flow analysis, and FLAC^(3D), which is used for mechanical analysis, was established. The model was validated through a documented water drainage experiment over a sandy column and a comparison of the results with measured data and simulated results from other researchers. The proposed model was used to investigate the features of water-air two-phase flow and stress fields in an unsaturated soil slope during rainfall infiltration. The slope stability analysis was then performed based on the simulated water-air two-phase seepage and stress fields on a given slip surface. The results show that the safety factor for the given slip surface decreases first, then increases, and later decreases until the rainfall stops. Subsequently, a sudden rise occurs. After that, the safety factor decreases continually and reaches its lowest value, and then increases slowly to a steady value. The lowest value does not occur when the rainfall stops, indicating a delayed effect of the safety factor. The variations of the safety factor for the given slip surface are therefore caused by a combination of pore-air pressure, matric suction, normal stress, and net normal stress.

关键词： Coupled liquid-gas-solid three-phase model Pore-air pressure Unsaturated soil slope stability Rainfall infiltration

Construction of biomimetic proton transport channels in metal-organic framework

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2024年第3期35卷 513-517页

作者： xiao-min li Junchao Jia Danting Yang Jiali Jin Junkuo Gao School of Materials Science and Engineering Institute of Functional Porous MaterialsZhejiang Sci-Tech UniversityHangzhou 310018China Zhejiang Key Laboratory of Pathophysiology School of Public HealthSchool of MedicineNingbo UniversityNingbo 315211China

Construction of proton transport channels in metal-organic frameworks(MOFs)with simple synthesis processes,high proton conductivities and good performance stabilities has been of great interest for proton exchange membrane fuel cell(PEMFC).Herein,we mimic the proton transport behavior of amino acid residues in bacteriorhodopsin,select UiO-66-COOH as the host,glycine and aspartic acid as the functional guest molecules,and then functionalize the MOF framework with amino acids to obtain biomimetic proton transport *** strategy endows UiO-66-COOH-Asp a high proton conductivity of 1.19×10^(-2)S/cm at 70℃and 98%RH,excellent cycle stability of performances and performance durability,which can be comparable to the reported MOFs-based proton ***,the proton conduction mechanism in UiO-66-COOH-Asp is elaborated in detail due to its visual structure,which is also one of the advantages of adopting MOFs as research platform,making it possible to optimize the structure-activity relationship of advanced ***,this strategy has clear objectives and simple synthesis,which has made certain contributions to both theoretical research and future industrial production of proton conductors.

关键词： MOF Amino acids Biomimetic proton transport channels Synergistic effect Proton conduction mechanism

在线全文

学校读者我要写书评

暂无评论

基于三方演化博弈的充电桩规范运营治理研究

长江师范学院学报 2025年第1期41卷 110-124页

作者：李晓敏毛守恒王安琪河南大学经济学院河南开封475001 河南大学中原发展研究院河南郑州450046 曼彻斯特大学数字院英国曼彻斯特M139PL

以充电桩为代表的充电基础设施是新型基础设施建设的重要内容,充电桩的规范运营关系到新能源汽车产业链的安全和韧性。针对充电桩市场上的违规运营问题,构建动态奖惩机制下充电桩运营商、地方政府和新能源汽车消费者三方参与的博弈模型... 详细信息

以充电桩为代表的充电基础设施是新型基础设施建设的重要内容,充电桩的规范运营关系到新能源汽车产业链的安全和韧性。针对充电桩市场上的违规运营问题,构建动态奖惩机制下充电桩运营商、地方政府和新能源汽车消费者三方参与的博弈模型,对模型中可能存在的策略均衡点进行稳定性分析,并且利用数值仿真模拟主要参数变化对系统演化的影响。研究结果表明:第一,净收益的提高有利于激发充电桩运营商规范运营的积极性。第二,加大地方政府对充电桩运营商的奖励和惩罚力度均可以促进充电桩的规范运营,地方政府可以通过提高奖惩上限和扩大奖惩比例两种手段加大对充电桩运营商的奖惩力度。第三,地方政府实施奖惩结合政策的效果优于单独实施奖励性政策或惩罚性政策的效果,更为重要的是,在动态奖惩机制下,地方政府对充电桩运营商的奖惩力度存在临界值。当奖惩力度小于临界值时,惩罚性政策的激励效果优于奖励性政策;当奖惩力度大于临界值时,奖励性政策的激励效果优于惩罚性政策。第四,加大违规运营商对新能源汽车消费者的赔偿力度和降低消费者的投诉难度不仅能倒逼充电桩运营商规范运营,而且能引导消费者参与充电桩的规范运营治理。

关键词：充电桩运营治理策略三方演化博弈仿真