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2016 IEEE 43rd Photovoltaic Specialists Conference (PVSC)

作者： Qiong Chen Henan Liu Hui-Seon Kim Yucheng Liu Mengjin Yang Naili Yue Gang Ren Kai Zhu Shengzhong Frank Liu Nam-Gyu Park Yong Zhang Department of Electrical and Computer Engineering The University of North Carolina at Charlotte Charlotte NC USA Optical Science and Engineering graduate program The University of North Carolina at Charlotte Charlotte NC USA Department of Energy Science Sungkyunkwan University Suwon South Korea National Ministry of Education Shaanxi Normal University Xi'an China Chemical and Materials Science Center National Renewable Energy Laboratory CO USA Molecular Foundry Lawrence Berkeley National Laboratory Berkeley CA USA Key Laboratory of Applied Surface and Colloid Chemistry National Ministry of Education Shaanxi Normal University Xi'an Shaanxi CN School of Chemical Engineering Sungkyunkwan University Suwon South Korea University of North Carolina at Charlotte Charlotte NC US

By performing spatially resolved Raman and photoluminescence spectroscopy with different illumination conditions, we have achieved a unified understanding towards the spectroscopy signatures of the organic-inorganic hybrid perovskite, transforming from the pristine state (CH 3 NH 3 PbI 3 or MAPbI 3 ) to fully degraded state (i.e., PbI 2 ), for samples with varying crystalline domain size from mesoscopic scale to macroscopic size, synthesized by three different techniques.

关键词： Measurement by laser beam Density measurement Chemistry Lighting Optical films Degradation Spectroscopy

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Pyrolytically grown indium sulfide sensitized zinc oxide nanowires for solar water splitting

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Physica Status Solidi (C) Current Topics in Solid State Physics 2015年第9-11期12卷 1251-1255页

作者： Komurcu, Pelin Can, Emre Kaan Aydin, Erkan Semiz, Levent Gurol, Alp Eren Alkan, Fatma Merve Sankir, Mehmet Sankir, Nurdan Demirci Micro and Nanotechnology Graduate Program TOBB University of Economics and Technology Ankara06560 Turkey Department of Materials Science and Nanotechnology Engineering TOBB University of Economics and Technology Ankara06560 Turkey

Zinc oxide (ZnO) nanowires, sensitized with spray pyrolyzed indium sulfide, were obtained by chemical bath deposition. The XRD analysis indicated dominant evolution of hexagonal ZnO phase. Significant gain in photoelectrochemical current using ZnO nanowires is largely accountable to enhancement of the visible light absorption and the formation of heterostructure. The maximum photoconversion efficiency of 2.77% was calculated for the indium sulfide sensitized ZnO nanowire photoelectrodes. (© 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

关键词： Spray pyrolysis

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26th Annual Computational Neuroscience Meeting (CNS*2017): Part 3 Antwerp, Belgium. 15-20 July 2017 Abstracts

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BMC NEUROscience 2017年第SUPPL 1期18卷 95-176页

作者： [Anonymous] Department of Neuroscience Yale University New Haven CT 06520 USA Department Physiology & Pharmacology SUNY Downstate Brooklyn NY 11203 USA NYU School of Engineering 6 MetroTech Center Brooklyn NY 11201 USA Departament de Matemàtica Aplicada Universitat Politècnica de Catalunya Barcelona 08028 Spain Institut de Neurobiologie de la Méditerrannée (INMED) INSERM UMR901 Aix-Marseille Univ Marseille France Center of Neural Science New York University New York NY USA Aix-Marseille Univ INSERM INS Inst Neurosci Syst Marseille France Laboratoire de Physique Théorique et Modélisation CNRS UMR 8089 Université de Cergy-Pontoise 95300 Cergy-Pontoise Cedex France Department of Mathematics and Computer Science ENSAT Abdelmalek Essaadi’s University Tangier Morocco Laboratory of Natural Computation Department of Information and Electrical Engineering and Applied Mathematics University of Salerno 84084 Fisciano SA Italy Department of Medicine University of Salerno 84083 Lancusi SA Italy Dipartimento di Fisica Università degli Studi Aldo Moro Bari and INFN Sezione Di Bari Italy Data Analysis Department Ghent University Ghent Belgium Coma Science Group University of Liège Liège Belgium Cruces Hospital and Ikerbasque Research Center Bilbao Spain BIOtech Department of Industrial Engineering University of Trento and IRCS-PAT FBK 38010 Trento Italy Department of Data Analysis Ghent University Ghent 9000 Belgium The Wellcome Trust Centre for Neuroimaging University College London London WC1N 3BG UK Department of Electronic Engineering NED University of Engineering and Technology Karachi Pakistan Blue Brain Project École Polytechnique Fédérale de Lausanne Lausanne Switzerland Departement of Mathematics Swansea University Swansea Wales UK Laboratory for Topology and Neuroscience at the Brain Mind Institute École polytechnique fédérale de Lausanne Lausanne Switzerland Institute of Mathematics University of Aberdeen Aberdeen Scotland UK Department of Integrativ

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Microstructure and Thermal Conductivity of Porous Al2 O3-ZrO2 Ceramics 58th

Microstructure and Thermal Conductivity of Porous Al2 O3-ZrO...

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58th Brazilian Ceramic Conference, CBC 2014

作者： Delbrücke, Tiago Gouvêa, Rogério A. Raubach, Cristiane W. Longo, Elson Sousa, Vânia C. M.tebcheranic, Sergio Kubaski, Evaldo T. Moreira, Mário L. Jurado, Jose R. Cava, Sergio Graduate Program in Science and Materials Engineering Technology Development Center Federal University of Pelotas RS Pelotas96010-900 Brazil Laboratory of Biomaterials & Advanced Ceramics Federal University of Rio Grande do Sul RS Porto Alegre91509-900 Brazil Interdisciplinary Laboratory of Ceramic Materials Ponta Grossa State University PR Ponta Grossa84030-900 Brazil National Institute of Science and Technology of Materials in Nanotechnology Paulista State University SP Araraquara14801-907 Brazil Glass Department Institute of Glass and Ceramic Madrid28049 Spain Institute of Physics and Mathematics Federal University of Pelotas RS Pelotas96010-900 Brazil

The improvement on the development of porous ceramic materials has leaded to new technologies in thermal insulation, for example, composite materials for better performance of pressure vessels in rocket engines. Within this context, the present work aims to evaluate the ability of a refractory ceramic base alumina/zirconia through the processes of co-precipitation and replica method in an organic fiber template. The green body was burnt-out and sintered at 1200-1600°C to obtain the continuous porous ceramic fibers. In the FEG-SEM analysis, an interconnected porous structure with small grains was observed. The crystalline phases were determined by X-ray diffraction and compared to micro-Raman results regarding the crystalline structure confirms that there present in the material zirconia is composed of more than one phase. Porosity was calculated through a mercury porosimeter as 77.9%, and the Laser Flash method gave a thermal conductivity value of 1.61 K W.m−1 .K−1 for the Al2 O3-ZrO2 fibers. © 2015 Trans Tech Publications Ltd, Switzerland.

关键词： Porosity

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Chemical changes in polyetherimide (PEI) joined by friction-based injection clinching joining (F-ICJ) technique

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AIP Conference Proceedings 2016年第1期1779卷

作者： M. Sônego A. B. Abibe J. F. dos Santos L. B. Canto S. T. Amancio-Filho 1Graduate Program in Materials Science and Engineering (PPG-CEM) Federal University of São Carlos (UFSCar) São Carlos SP Brazil 2Helmholtz-Zentrum Geesthacht Centre for Materials and Coastal Research Institute of Materials Research Materials Mechanics Solid State Joining Processes Geesthacht Germany 3Hamburg University of Technology Institute of Polymer Composites Hamburg Germany

The study of new joining technologies for multimaterial structures is motivated by the environmental friendly policy of weight reduction in the automotive industry. Friction-based Injection Clinching Joining (F-ICJ) (European Patent Application EP 14182938.2) is a new staking-based joining technique, which uses frictional heating to produce joints in an energy-efficient and fast manner. In F-ICJ a non-consumable tool applies friction and force to soften or melt and deform a polymeric stud fitted in a through hole of a joining partner. After consolidation, the deformed stud (stake) mechanically joins the partners by creating a staked joint. The thermomechanical process exposes the polymer to high temperatures (250 - 290°C) and deformation rates resulting from the combination of tool rotational speeds of 8000-12000 rpm and short joining cycles (5-10 seconds). Resulting changes in material properties can affect the global performance of the joints. This study aims to investigate the chemical changes occurred in the polymeric partner of hybrid joints on polyetherimide (PEI) and aluminum 6082-T6. Molecular weight distribution (Size-Exclusion Chromatography - SEC) and chemical structure (Fourier transform infrared spectroscopy – FTIR) analyses were performed on the base material and PEI extracted from a joint to evidence any possible chemical changes caused by frictional heating. The polymeric sample from the joint showed number-average molecular weight (Mn) 23% smaller and weight-average molecular weight (Mw) 15% smaller than the PEI base material. FTIR spectra show reduction in the intensity of phthalimide bands owing to the F-ICJ process. Therefore, these analyses identified the extension of chain scission in the PEI caused by shear and heat imposed by F-ICJ process, which are fundamental for process optimization.

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Inside Cover: Nonplanar Butterfly-Shaped π-Expanded Pyrrolopyrroles (Chem. Eur. J. 46/2016)

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Chemistry – A European Journal 2016年第46期22卷 16326-16326页

作者： Maciej Krzeszewski Takuya Kodama Eli M. Espinoza Prof. Dr. Valentine I. Vullev Prof. Dr. Takashi Kubo Prof. Dr. Daniel T. Gryko Institute of Organic Chemistry Polish Academy of Sciences Kasprzaka 44–52 01-224 Warsaw Poland Department of Bioengineering Department of Biochemistry Department of Chemistry and Materials Science and Engineering Program University of California Riverside California 92521 USA Graduate School of Science Osaka University Toyonaka Osaka 560-0043 Japan

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Localized microjetting in the collapse of surface macrocavities

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Physical Review E 2015年第2期91卷 022405-022405页

作者： K. L. Olney P.-H. Chiu D. J. Benson A. Higgins M. Serge V. F. Nesterenko Department of Mechanical and Aerospace Engineering University of California San Diego La Jolla California 92093 Materials Science and Engineering Graduate Program University of California San Diego La Jolla California 92093 Department of Structural Engineering University of California San Diego La Jolla California 92093 Department of Mechanical Engineering McGill University Quebec H3A 0C3 Canada

This paper focuses on the multiscale mechanism of collapse of hemicylindrical annular surface macrocavities in steel caused by high-strain, high-strain rate plastic flow of copper. Experiments and simulations revealed that a two-stage process is responsible for the observed microjetting phenomena: the formation of lateral copper microjets from the localized shear flow in copper at the interface during the filling of the cavity, and their subsequent collision at the apex of the macrocavity generating two additional horizontal microjets. The lengths of these microjets were an order of magnitude smaller than the cavity size but linearly scaled with the cavity radius. This process of microjet development is sensitive to the cavity geometry and is unlike the previously observed jetting phenomena in cavitation, impact crater collapse, or shock-induced cavity collapse.

关键词： VERY light jets SURFACES (Physics) STRAIN rate (materials science) PLASTICITY COPPER METALS -- Mechanical properties

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Transistors: Layer‐by‐Layer Assembled 2D Montmorillonite Dielectrics for Solution‐Processed Electronics (Adv. Mater. 1/2016)

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Advanced materials 2016年第1期28卷

作者： Jian Zhu Xiaolong Liu Michael L. Geier Julian J. McMorrow Deep Jariwala Megan E. Beck Wei Huang Tobin J. Marks Mark C. Hersam Department of Materials Science and Engineering Northwestern University 2220 Campus Drive Evanston IL 60208 USA Graduate Program in Applied Physics Northwestern University Evanston IL 60208 USA Department of Chemistry Northwestern University Evanston IL 60208 USA Department of Medicine Northwestern University Evanston IL 60208 USA

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Production and characterization of fuel briquettes from banana leaves waste

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Chemical engineering Transactions 2014年 37卷 439-444页

作者： De Oliveira Maia, Bianca G. Souza, Ozair Marangoni, Cintia Hotza, Dachamir De Oliveira, Antonio Pedro N. Sellin, Noeli Graduate Program in Materials Science and Engineering - PGMAT Federal University of Santa Catarina 88040 900 Florianópolis-SC Brazil Masters in Process Engineering University of Joinville Region - UNIVILLE 89219 710 Joinville-SC Brazil

The use of agricultural and agro-industrial waste as biomass fuel for power generation like briquettes can be an alternative solution to the problems related at their disposal. Briquettes produced from lignocellulosic waste, through a simple process and low cost are an excellent source of cheap energy and environmentally correct, in many cases, ideal for replacing fossil fuels in use today, with significant economic and environmental advantages. The banana cultivation generates a significant amount of waste, but little used, it would be important to add value to them. In this work banana semi-dried leaves were crushed to particles with sizes between 2 and 5 mm and its moisture content was determined. The briquettes were produced in a hydraulic press with compaction pressure of 18 MPa and two different compression times and were evaluated by proximate and ultimate chemical analysis, high heating value (HHV), thermogravimetric analysis (TGA), differential thermal analysis (DTA), linear shrinkage, mechanical compressive strength, bulk and energy density. Briquettes presented moisture content of 7.2 %, high contents of carbon (44.3 %) and volatile matter (75.3 %), low sulphur and nitrogen contents and HHV of 17.7 MJ/kg. These results are similar for other biomass used to produce briquettes. Under combustion in TGA and DTA analysis, the briquettes showed high loss mass and maximum energy release between 200 and 500 °C. The mechanical compressive strength for 1 second compression was 5.3 MPa and the briquettes density was 0.99 g/cm3. The thermal properties and physicochemical characteristics of the banana leaves briquettes demonstrate its potential for use as biomass fuel. Copyright © 2014,AIDIC Servizi S.r.l.

关键词： Compressive strength

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2-[(Hydroxymethyl)amino]ethanol in water as a preservative: Study of formaldehyde released by Taguchi's method

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IOP Conference Series: Earth and Environmental science 2016年第1期36卷

作者： W Wisessirikul S Loykulnant S Montha T Fhulua P Prapainainar Interdisciplinary Graduate Program in Advanced and Sustainable Environmental Engineering Thailand Advanced Institute of Science and Technology and Tokyo Institute of Technology Kasetsart University Bangkok 10900 Thailand Natural Rubber Focus Unit National Metal and Materials Technology Center NSTDA 111 Paholyothin Rd. Klong 1 Klong Luang Pathumthani 12120 Thailand Environment Research Unit National Metal and Materials Technology Center NSTDA 111 Paholyothin Rd. Klong 1 Klong Luang Pathumthani 12120 Thailand National Center of Excellence for Petroleum Petrochemicals and Advance Materials Department of Chemical Engineering Faculty of Engineering Kasetsart University Thailand Center of Excellence of Nanotechnology Kasetsart University Thailand

This research studied the quantity of free formaldehyde released from 2- [(hydroxymethyl)amino]ethanol (HAE) in DI water and natural rubber latex mixture using high-performance liquid chromatography (HPLC) technique. The quantity of formaldehyde retained in the solution was cross-checked by using titration technique. The investigated factors were the concentration of preservative (HAE), pH, and temperature. Taguchi's method was used to design the experiments. The number of experiments was reduced to 16 experiments from all possible experiments by orthogonal arrays (3 factors and 4 levels in each factor). Minitab program was used as a tool for statistical calculation and for finding the suitable condition for the preservative system. HPLC studies showed that higher temperature and higher concentration of the preservative influence the amount of formaldehyde released. It was found that conditions at which formaldehyde was released in the lowest amount were 1.6%w/v HAE, 4 to 40 °C, and the original pH. Nevertheless, the pH value of NR latex should be more than 10 (the suitable pH value was found to be 13). This preservative can be used to replace current preservative systems and can maintain the quality of latex for long-term storage. Use of the proposed preservative system was also shown to have reduced impact on the toxicity of the environment.

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