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Performance degradation of PEM fuel cell stack after frequent startup-shutdown cycles

Performance degradation of PEM fuel cell stack after frequen...

国际可再生清洁能源的电化学材料和技术大会(International Conference on Electrochemical materials and Technologies for Clean Sustainable Energy)

作者： Yi Yu Shuang Zhai Zhe Hu Pei Chen Mu Pan State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070P.R.China New Energy Vehicle & Technology Management Dept.SAIC Motor Corporation Ltd.No.201 AnYan Rd.JiaDing DistrictShanghai 201804P.R.China State Key Laboratory of Advanced Technology for Materials Synthesis and ProcessingWuhan University of TechnologyWuhan 430070P.R.China New Energy Vehicle & Technology Management Dept. SAIC Motor Corporation Ltd.No.201 AnYan Rd.JiaDing DistrictShanghai 201804P.R.China

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An electronic criterion for assessing the intrinsic plasticity or brittleness of metallic glasses

An electronic criterion for assessing the intrinsic plastici...

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13th International Conference on Fracture（ICF13）

作者： X.F.Wang Y.Wu S.Halas T.Pienkos T.Durakiewicz W.Li Z.P.Lü Key Laboratory of Low Dimensional Materials&Application Technology(Ministry of Education) Xiangtan University State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Institute of Physics Maria Curie-Sklodowska UniversityLublin 20-031Poland Los Alamos National Laboratory Mailstop K764Los Alamos New Mexico 87545USA Key Laboratory of Low Dimensional Materials & Application Technology(Ministry of Education) Xiangtan University

＜正＞Development of bulk metallic glasses（BMGs） for engineering applications has long been impeded by their ambient *** overcome this issue,efforts have been devoted to understanding the atomic bonding nature of these amorphous ***,neither simple theoretical nor experimental means for investigating the electronic origins of the brittle-

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Electrospun fluorescein/polymer composite nanofibers and their photoluminescent properties

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Chinese Physics B 2012年第9期21卷 514-519页

作者：张志华龙云泽尹红星孙彬郑杰张红娣纪新明顾长志 College of Physics Qingdao University State Key Laboratory of ASIC & System Department of Microelectronics Fudan University State Key Laboratory Cultivation Base of New Fiber Materials & Modern Textile Qingdao University Key Laboratory of Photonics Materials and Technology in Universities of Shandong (Qingdao University) Institute of Physics Chinese Academy of Sciences

Fluorescein/polyvinyl pyrrolidone （PVP） composite nanofibers with different fluorescein loadings （with a weight concentration of 0-5.0%） are fabricated via electrospinning. Morphologies, structures and photoluminescent （PL） prop- erties of these straight, helical or wavelike fibers are characterized by scanning electron microscopy （SEM）, fluorescence microscopy and a spectrophotometer. It is found that the maximum emission of the as-spun fluorescein/PVP fibers occurs at 510 nm. The PL intensity of the composite fiber increases with fluorescein concentration, then fluorescence quenching appears when the concentration reaches 1.67%. The mechanism of fluorescence quenching of fiuorescein is discussed. In addition, the composite fibers exhibit a much stronger PL intensity than fluorescein/PVP bulk film owing to larger specific surface area, which makes them promising materials for biomedical applications such as probes and sensors.

关键词： nanoflbers electrospinning fluorescence self-quenching

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Fabrication of Nano-branched Coaxial Polyaniline/Polyvinylidene Fluoride Fibers via Electrospinning for Strain Sensor

Fabrication of Nano-branched Coaxial Polyaniline/Polyvinylid...

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2013 International Conference on materials Science,Machinery and Energy Engineering(MSMEE 2013)

作者： Rong Huang Yunze Long Chengchun Tang Hongdi Zhang College of Physics Qingdao University CAS Key Lab for Biological Effects of Nanomaterials and Nanosafety National Center for NanoScience and Technology State Key Laboratory Cultivation Base of New Fiber Materials and Modern Textile Qingdao University Institute of Physics Chinese Academy of Sciences

Soft conductive elastomer materials have wide potential applications in material science and electronic engineeringThrough electrospinning and in-situ polymerization, a kind of wellorganized coaxial polyaniline/polyvinylidence fluoride(PANI/PVDF) microfibers with conductivity about 0.6 S/cm were fabricated, which combined the advantages of conducting polymer and elastic materialIt is found that the resistance of the fibers was changed with the curvature variationThe results indicate that the PANI/PVDF microfibers could be used as strain sensor with high flexibility, high sensitivity, and stable repeatability.

关键词： Conducting polymer Polyaniline Nanofiber Electrospinning Strain sensor

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Effect of Cationic Groups in Organic Sulfide Electrolyte on the performance of Quantum Dot Sensitized Solar Cells

Effect of Cationic Groups in Organic Sulfide Electrolyte on ...

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International Conference on Nanoscience & technology,China 2013(ChinaNANO 2013)(中国国际纳米科学和技术大会)

作者： Xin Li Heping Shen Jianbao Li Hong Lin Key Laboratory of Ministry of Education for Application Technology of Chemical Materials in Hainan Superior Resources Hainan Provincial Key Laboratory of Research on Utilization of Si-Zr-Ti ResourcesCollege Of Materials Science And Chemical EngineeringHainan UniversityHaikou 570228China State Key Laboratory of New Ceramics & Fine Processing School of Material Science and EngineeringTsinghua UniversityBeijing 100084China

Two organic redox couples: tetrabutylammonium cation (McMT-TBA+)/disulfide dimer (BMT) and tetramethylammonium cation (McMT-TMA+)/BMT derived from 2-mercapto-5-methyl-1, 3, 4-thiadiazole (McMT) were introduced to the CdS quantum dots sensitized solar cells (QDSCs), compared with the one based on the inorganic sulfide electrolyte (Na2S/S).It was found that the charge transfer resistances at the interface of the organic sulfide electrolytes and the platinum counter electrode are much lower and the interface reaction rates are higher.

关键词： quantum dots solar cells organic sulfide electrolyte cationic groups charge diffusion

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高压下钠氯之间的反常计量比化合物

高压下钠氯之间的反常计量比化合物

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第17届中国高压科学学术会议

作者： Weiwei Zhang Artem R.Oganov Alexander F.Goncharov Qiang Zhu Salah Eddine Boulfelfel Andriy O.Lyakhov Elissaios Stavrou Maddury Somayazulu Vitali B.Prakapenka Zuzana Kon(o)pková School of Materials Science Northwestern PolytechnicalUniversityXi''an 710072China Geophysical LaboratoryCarnegie Institution of Washington5251 Broad Branch RoadNWWashingtonDC 20015USA 中国农业大学理学院应用物理系北京10086 Center for Energy Matter inExtreme Environments and Key Laboratory of Materials Physics Institute of Solid State PhysicsChinese Academy of Sciences350 Shushanghu RoadHefeiAnhui 230031China Department of GeosciencesCenterfor Materials by Designand Institute for Advanced ComputationalScienceState University of New YorkStony BrookNY 11794USA Geophysical LaboratoryCarnegie Institution of Washington5251 Broad Branch RoadNWWashingtonDC 20015USA Center forAdvanced Radiation SourcesUniversity of ChicagoChicagoIL 60637USA Photon Science DESYD-22607 HamburgGermany Department of Geosciences Centerfor Materials by Designand Institute for Advanced ComputationalScienceState University of New YorkStony BrookNY 11794USA Department of GeosciencesCenterfor Materials by Designand Institute for Advanced ComputationalScienceState University of New YorkStony BrookNY 11794USA Moscow Institute of Physics and Technology 9Institutskiy LaneDolgoprudny CityMoscow Region 141700Russia

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Sintering,crystallization and dielectric properties of CaO-B_2O_3-SiO_2 system glass ceramics

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Journal of Central South University 2012年第8期19卷 2101-2106页

作者：戴斌朱海奎周洪庆许贵军岳振星 State Key Laboratory of Materials-Oriented Chemical Engineering(Nanjing University of Technology) College of Materials Science and Engineering Nanjing University of Technology State Key Laboratory of New Ceramic and Fine Processing(Tsinghua University)

CaO-B203-SiO2 （CBS） glass powders are prepared by conventional glass melting method at different melting temperatures whose properties and microstructures are characterized by X-ray diffraction （XRD） and scanning electron microscopy （SEM）. It is found that there are SiO2 and some unknown phases in CBS glass melting liquid from 1 300 ℃ to 1 500 ℃ and the amount of these phases decreases with the increase of the melting temperature. The CBS glass melted at 1 450 ℃ could be sintered from 830 ℃ to 930 ℃ and the bulk densities of the samples are all higher than 2.4 g/cm^3. From the points of the properties and energy conservation, the melting temperature of 1 450 ℃ is the optimal melting temperature. The glass ceramic sintered at 850 ℃ exhibits better dielectric properties： er=6.33, tan6=2.2×10^-3 at 10 GHz, and the major phases of the samples are CaSiO3, CaB2O4 and SiO2.

关键词： glass ceramics CaO-B2O3-SiO2 sintering dielectric properties microstructure

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Microstructure and dielectric properties of Ca-Al-B-Si-O glass/Al_2O_3 composites with various alkali oxides contents

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Journal of Central South University 2012年第10期19卷 2733-2739页

作者：刘明周洪庆朱海奎岳振星赵建新 College of Materials Science and Engineering Nanjing University of Technology State Key Laboratory of Materials-Oriented Chemical Engineering(Nanjing University of Technology) State Key Laboratory of New Ceramic and Fine Processing(Tsinghua University)

The effects of alkali oxides （Na2O and K2O addition on both the sintering behavior and dielectric properties of Ca-AI-B-Si-O glass/Al2O3 composites were investigated by Fourier transform infrared spectroscopy （FTIR）, differential scanning calorimeter （DSC）, X-ray diffractometry （XRD） and scanning electron microscopy （SEM）. The results show that the increasing amount of alkali oxides in the glass causes the decrease of [SiO4], which results in the decrease of the continuity of glass network, and leads to the decrease of the softening temperature Tf of the samples and the increasing trend of crystallization. And that deduces corresponding rise of densification, dielectric constant, dielectric loss of the low temperature co-fired ceramic （LTCC） materials and the decrease of its thermal conductivity. By contrast, the borosilicate glass/A1203 composites with 1.5% （mass fraction） alkali oxides sintered at 875 ℃ for 30 rain exhibit better properties of a bulk density of 2.79 g/cm3, a porosity of 0.48%, a 2 value of 2.28 W/（m.K）, a er value of 7.82 and a tand value of 9.1 × 10-4 （measured at 10 MHz）.

关键词： borosilicate glass alkali oxides Ca-AI-B-Si-O glass Al2O3 microstructure thermal properties dielectric properties

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Highly Ordered Mesoporous Tungsten Oxides with a Large Pore Size and Crystalline Framework for H2S Sensing†

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Angewandte Chemie 2014年第34期126卷

作者： Yuhui Li Wei Luo Nan Qin Junping Dong Jing Wei Wei Li Shanshan Feng Junchen Chen Jiaqiang Xu Ahmed A. Elzatahry Mahir H. Es‐Saheb Yonghui Deng Dongyuan Zhao Department of Chemistry Advanced Materials Laboratory and State Key Laboratory of Molecular Engineering of Polymers Fudan University Shanghai 200433 (P. R. China) Department of Chemistry College of Science Shanghai University Shanghai 200444 (P. R. China) Department of Chemistry‐College of Science King Saud University Riyadh 11451 (Saudi Arabia) Polymer Materials Research Department Advanced Technology and New Materials Research Institute City for Scientific Research and Technology Applications New Borg El‐Arab City P.O. Box: 21934 Alexandria (Egypt) Mechanical Engineering Department King Saud University P.D. Box 800 Riyadh 11421 (Saudi Arabia)

An ordered mesoporous WO 3 material with a highly crystalline framework was synthesized by using amphiphilic poly(ethylene oxide)‐ b ‐polystyrene (PEO‐ b ‐PS) diblock copolymers as a structure‐directing agent through a solvent‐evaporation‐induced self‐assembly method combined with a simple template‐carbonization strategy. The obtained mesoporous WO 3 materials have a large uniform mesopore size (ca. 10.9 nm) and a high surface area (ca. 121 m 2 g −1 ). The mesoporous WO 3 ‐based H 2 S gas sensor shows an excellent performance for H 2 S sensing at low concentration (0.25 ppm) with fast response (2 s) and recovery (38 s). The high mesoporosity and continuous crystalline framework are responsible for the excellent performance in H 2 S sensing.

关键词： Blockcopolymere Gassensoren Mesoporöse Materialien Schwefelwasserstoff Wolframoxid

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Transport property tuned by gate irradiation in Zno nanotetrapod devices

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Journal of Physical Chemistry C 2012年第23期116卷 12397-12400页

作者： Wang, Wenhua Qi, Junjie Qin, Zi Wang, Qinyu Sun, Xu Zhang, Yue State Key Laboratory for Advanced Metals and Materials School of Materials Science and Engineering Beijing 100083 China Key Laboratory of New Energy Materials and Technologies University of Science and Technology Beijing Beijing 100083 China

The transport properties tuned by gate electron-beam irradiation was investigated for ohmic- and Schotty-contact-type semiconductor optoelectronic devices based on a single zinc oxide (ZnO) nanotetrapod. Measurements of the I-V characteristics and time-dependent current were conducted. The results indicate that, for both ohmic and Schottky contact devices, the electrical transport properties can be readily tuned by electron-beam irradiation at the gate leg of the tetrapod, with favorable repeatability and reversibility. The response for the Schottky-contact-type device was obviously greater than that for the ohmic-contact-type device, and the closer the irradiated position approached the crystal nucleus, the larger the current response became. A probable mechanism is proposed and discussed. The ZnO nanotetrapod could potentially be used as a detector in irradiation environments. © 2012 American Chemical Society.

关键词： Irradiation

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