检索结果-内蒙古大学图书馆

Fabrication of Polymeric Visual Decoys for the Male Emerald Ash Borer （Agrilus planipennis）

Journal of Bionic engineering 2013年第2期10卷 129-138页

作者： Drew P. Pulsifer Akhlesh Lakhtakia Mahesh S. Narkhede Michael J. Domingue Beverly G. Post Jayant Kumar Raul J. Martln-Palma Thomas C. Baker Department of Engineering Science & Mechanics Pennsylvania State University University Park Pennsylvania 16802 USA Center for Advanced Materials and Department of Plastics Engineering University of Massachusetts Lowell Lowell MA 01854 USA Department of Entomology Pennsylvania State University University Park PA 16802 USA Center for Advanced Materials and Department of Physics & Applied Physics University of Massachusetts Lowell Lowell MA 01854 USA Department of Materials Science & Engineering Pennsylvania State University University Park Pennsylvania 16802 USA

Through a bioreplication approach, we have fabricated artificial visual decoys for the invasive species Agrilus planipen- nis--commonly known as the Emerald Ash Borer （EAB）. The mating behavior of this species involves an overflying EAB male pouncing on an EAB female at rest on an ash leaflet before copulating. The male spots the female on the leaflet by visually detecting the iridescent green color of the female＇s elytra. As rearing EAB and then deploying dead females as decoys for trapping is both arduous and inconvenient, we decided to fabricate artificial decoys. We used a dead female to make a negative die of nickel and a positive die of epoxy. Decoys were then made by first depositing a quarter-wave-stack Bragg reflector on a polymer sheet and then stamping it with a pair of matched negative and positive dies to take the shape of the upper surface of an EAB female. As nearly 100 artificial decoys were fabricated from just one EAB female, this bioreplication process is industrially scalable. Preliminary results from a field trapping test are indicative of success.

关键词： bioreplication conformal-evaporated-film-by-rotation method electroforming negative die positive die stampingCopyright ~ 2013 Jilin University. Published by science Press and Elsevier Limited. All rights reserved.

来源：评论

学校读者我要写书评

暂无评论

Magnesium vapor reduction of structured silica for lithium ion battery applications

Magnesium vapor reduction of structured silica for lithium i...

引用

2013 MRS Fall Meeting

作者： Cook, Rob Schrandt, Matthew Kolla, Praveen Rhine, Wendell Koodali, Ranjit Smirnova, Alevtina Zyvex Technologies Rapid City SD 57701 United States Materials Engineering and Science Program South Dakota School of Mines and Technology Rapid City SD 57701 United States Aspen Aerogels Northborough MA 01532 United States University of South Dakota Vermillion SD 57069 United States Department of Chemistry and Applied Biological Sciences South Dakota School of Mines and Technology Rapid City SD 57701 United States

Three types of silica materials with different morphology, specifically SiO2 hollow microspheres, mesoporous silica, and silica aerogel were tested as potential precursors for synthesis of silicon nano- and meso-structures that resemble the original morphology of the precursors. In the optimized magnesium thermal reduction process, magnesium vapor was delivered to silica surface through a stainless steel mesh placed on top of a zirconia boat filled with silica precursor. This approach allowed for better control of silicon nanostructure formation by minimizing reaction by-products that can affect performance of lithium ion battery anode. Material morphological properties of the reduced silica precursors are discussed in terms of X-ray diffraction, BET, BJH pore size distribution, Raman spectroscopy, and TGA. Copyright © materials Research Society 2014.

关键词： Magnesium

来源：评论

学校读者我要写书评

暂无评论

Avian photoreceptor patterns represent a disordered hyperuniform solution to a multiscale packing problem

引用

Physical Review E 2014年第2期89卷 022721-022721页

作者： Yang Jiao Timothy Lau Haralampos Hatzikirou Michael Meyer-Hermann Joseph C. Corbo Salvatore Torquato Princeton Institute of the Science and Technology of Materials Princeton University Princeton New Jersey 08540 USA Materials Science and Engineering Arizona State University Tempe Arizona 85287 USA Department of Pathology and Immunology Washington University School of Medicine St. Louis Missouri 63110 USA Department of Systems Immunology Helmholtz Centre for Infection Research Braunschweig Germany Center for Advancing Electronics Dresden TU Dresden 01062 Dresden Germany Department of Chemistry Department of Physics Program in Computational and Applied Mathematics Princeton University Princeton New Jersey 08544 USA

Optimal spatial sampling of light rigorously requires that identical photoreceptors be arranged in perfectly regular arrays in two dimensions. Examples of such perfect arrays in nature include the compound eyes of insects and the nearly crystalline photoreceptor patterns of some fish and reptiles. Birds are highly visual animals with five different cone photoreceptor subtypes, yet their photoreceptor patterns are not perfectly regular. By analyzing the chicken cone photoreceptor system consisting of five different cell types using a variety of sensitive microstructural descriptors, we find that the disordered photoreceptor patterns are “hyperuniform” (exhibiting vanishing infinite-wavelength density fluctuations), a property that had heretofore been identified in a unique subset of physical systems, but had never been observed in any living organism. Remarkably, the patterns of both the total population and the individual cell types are simultaneously hyperuniform. We term such patterns “multihyperuniform” because multiple distinct subsets of the overall point pattern are themselves hyperuniform. We have devised a unique multiscale cell packing model in two dimensions that suggests that photoreceptor types interact with both short- and long-ranged repulsive forces and that the resultant competition between the types gives rise to the aforementioned singular spatial features characterizing the system, including multihyperuniformity. These findings suggest that a disordered hyperuniform pattern may represent the most uniform sampling arrangement attainable in the avian system, given intrinsic packing constraints within the photoreceptor epithelium. In addition, they show how fundamental physical constraints can change the course of a biological optimization process. Our results suggest that multihyperuniform disordered structures have implications for the design of materials with novel physical properties and therefore may represent a fruitful area for future research

关键词： PHOTORECEPTORS ARRAY processing BIRDS MULTISCALE modeling SAMPLING (Signal processing) EPITHELIUM

来源：评论

学校读者我要写书评

暂无评论

FE simulation of hydrogen diffusion in a duplex stainless steel -influence of phase shape and size and embedded defects

FE simulation of hydrogen diffusion in a duplex stainless st...

引用

23rd International Offshore and Polar engineering Conference, ISOPE 2013

作者： Olden, Vigdis Jemblie, Lise Johnsen, Roy SINTEF Department of Applied Mechanics and Corrosion Institute of Materials and Chemistry Trondheim Norway Department of Engineering Design and Materials Norwegian University of Science and Technology NTNU Trondheim Norway

ISBN: (纸本)9781880653999

ABAQUS FE simulations of hydrogen diffusion in duplex stainless steel have been performed. Hydrogen diffusion has been evaluated as a function of austenite phase size and shape. Hydrogen concentration due to stress and plastic strain close to an embedded flaw has also been evaluated. The work clearly demonstrates that both microstructure and flaws will influence the hydrogen diffusion and the hydrogen concentration and hence, must be taken into account when evaluating the susceptibility of hydrogen stress cracking in duplex stainless steels. Copyright © 2013 by the International Society of Offshore and Polar Engineers (ISOPE).

关键词： Finite element method

来源：评论

学校读者我要写书评

暂无评论

Localized Excited Charge Carriers Generate Ultrafast Inhomogeneous Strain in the Multiferroic BiFeO3

引用

Physical Review Letters 2014年第9期112卷 097602-097602页

作者： Daniel Schick Marc Herzog Haidan Wen Pice Chen Carolina Adamo Peter Gaal Darrell G. Schlom Paul G. Evans Yuelin Li Matias Bargheer Institut für Physik und Astronomie Universität Potsdam Karl-Liebknecht-Straße 24-25 14476 Potsdam Germany Abteilung Physikalische Chemie Fritz-Haber-Institut der Max-Planck-Gesellschaft Faradayweg 4-6 14195 Berlin Germany X-Ray Science Division Argonne National Laboratory Argonne Illinois 60439 USA Department of Materials Science and Engineering and Materials Science Program University of Wisconsin-Madison Madison Wisconsin 53706 USA Department of Material Science and Engineering Cornell University Ithaca New York 14853 USA Department of Applied Physics Stanford University Stanford California 94305-4045 USA Helmholtz-Zentrum Berlin für Materialien und Energie GmbH Wilhelm-Conrad-Röntgen Campus BESSY II Albert-Einstein-Straße 15 12489 Berlin Germany Kavli Institute at Cornell for Nanoscale Science Ithaca New York 14853 USA

We apply ultrafast x-ray diffraction with femtosecond temporal resolution to monitor the lattice dynamics in a thin film of multiferroic BiFeO3 after above-band-gap photoexcitation. The sound-velocity limited evolution of the observed lattice strains indicates a quasi-instantaneous photoinduced stress which decays on a nanosecond time scale. This stress exhibits an inhomogeneous spatial profile evidenced by the broadening of the Bragg peak. These new data require substantial modification of existing models of photogenerated stresses in BiFeO3: the relevant excited charge carriers must remain localized to be consistent with the data.

关键词： LATTICE dynamics MULTIFERROIC materials FERROELECTRICITY FEMTOSECOND lasers MAGNETISM PLASMA X-ray sources X-ray diffraction

来源：评论

学校读者我要写书评

暂无评论

Back Cover: Covalent Modification of Graphene Oxide with Carbazole Groups for Laser Protection (Chem. Eur. J. 12/2015)

引用

Chemistry – A European Journal 2015年第12期21卷 4856-4856页

作者： Ting Bai Cong-Qi Li Prof. Dr. Jie Sun Yi Song Prof. Dr. Jun Wang Prof. Dr. Werner J. Blau Dr. Bin Zhang Prof. Dr. Yu Chen Key Laboratory for Advanced Materials Institute of Applied Chemistry East China University of Science and Technology 130 Meilong Road Shanghai 200237 (P. R. China) Institute of Chemical Materials China Academy of Engineering Physics Mianyang 621900 Sichuan (P. R. China) The Centre for Research on Adaptive Nanostructures and Nanodevices School of Physics Trinity College Dublin Dublin 2 (Ireland) Key Laboratory of Materials for High-Power Laser Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai 201800 (P. R. China) Department of Chemical & Biomolecular Engineering National University of Singapore Kent Ridge Singapore 119260 (Singapore) Bin Zhang Department of Chemical & Biomolecular Engineering National University of Singapore Kent Ridge Singapore 119260 (Singapore) Yu Chen Key Laboratory for Advanced Materials Institute of Applied Chemistry East China University of Science and Technology 130 Meilong Road Shanghai 200237 (P. R. China)

来源：评论

学校读者我要写书评

暂无评论

Effect of Surface Morphology on the Corrosion of Electroless Nickel/Immersion Gold Films

引用

ECS Meeting Abstracts 2014年第7期MA2014-01卷

作者： Dong-Jun Lee Jun-Seok Ha Hyun-Soo Chu Hyo-Jong Lee Samsung Electro-Mechanics Co. LTD. Faculty of Applied Chemical Engineering Chonnam National University Department of Materials Science and Engineering Dong-A University Department of Materials Science and Engineering Dong-A University

Electroless nickel with immersion gold (ENIG) process has been widely used as a surface finishing for PCB (Printed Circuit Board). The ENIG process provides a uniform coating on Cu layer without any complex patterning process, and so it has wide and diverse electronic industrial applications; fine pitch surface mount, ball grid array(BGA), flip chip BGA packages and so on. However, there is a reliability issue in the ENIG process. Many researchers have pointed out that severe corrosion of electroless Ni surface is the one of the major factors to reliability failure. In the extreme case, it is known as the black pad which caused a failure of solder joint. A content of phosphorous higher than Ni-P deposits was detected on the failed pad surface, and galvanic cell formation resulted into the corrosion due to the difference of P concentration. The Ni surface has a mud-cracked appearance and the phosphorous content is abnormally higher (exceeding 10 wt%). Another similar issue related to ENIG process is pad discoloration due to Ni oxidation on the top of ENIG pad. Such discoloration pad is regarded as a failure due to cosmetic reason and a lack of clear standards. Sometimes, it actually leads to high contact resistance due to Ni oxides on the top of ENIG layer. Excessive oxidation of Ni layer may result in the non-wetting of solder to the ENIG layer during the reflow process for solder ball attachment because it is difficult for the flux to remove such excessive oxides. The Ni oxidation may be owing to Ni cation diffusion passing through Au immersion during wet process such as rinsing steps in the downstream process after ENIG treatment, which is an electrochemical phenomenon as well. Here, the pad discoloration of Ni corrosion during Electroless nickel with immersion gold (ENIG) treatment was investigated by SEM, XPS and cross-sectional EDS analysis. The Ni corrosion happened at the nodule boundary for relatively thinner layer whereas the corrosion pits were generated i

关键词：

来源：评论

学校读者我要写书评

暂无评论

Fast Electrical Control of Single Electron Spins in Quantum Dots with Vanishing Influence from Nuclear Spins

引用

Physical Review Letters 2014年第26期113卷 267601-267601页

作者： J. Yoneda T. Otsuka T. Nakajima T. Takakura T. Obata M. Pioro-Ladrière H. Lu C. J. Palmstrøm A. C. Gossard S. Tarucha Department of Applied Physics University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-8656 Japan RIKEN Center for Emergent Matter Science Hirosawa 2-1 Wako-shi Saitama 351-0198 Japan Département de Physique Université de Sherbrooke Sherbrooke Québec J1K 2R1 Canada CIFAR Program in Quantum Information Science Canadian Institute for Advanced Research (CIFAR) Toronto Ontario M5G 1Z8 Canada Materials Department University of California Santa Barbara California 93106 USA Electrical and Computer Engineering University of California Santa Barbara California 93106 USA

We demonstrate fast universal electrical spin manipulation with inhomogeneous magnetic fields. With fast Rabi frequency up to 127 MHz, we leave the conventional regime of strong nuclear-spin influence and observe a spin-flip fidelity >96%, a distinct chevron Rabi pattern in the spectral-time domain, and a spin resonance linewidth limited by the Rabi frequency, not by the dephasing rate. In addition, we establish fast z rotations up to 54 MHz by directly controlling the spin phase. Our findings will significantly facilitate tomography and error correction with electron spins in quantum dots.

关键词： ELECTRON spin NUCLEAR spin NUCLEAR magnetic resonance MAGNETIC fields QUANTUM dots

来源：评论

学校读者我要写书评

暂无评论

Electroless nickel phosphorus plating on carbon steel

Electroless nickel phosphorus plating on carbon steel

引用

materials science and Technology Conference and Exhibition 2013, MS and T 2013

作者： Lin, Cui Dadvand, Nazila Farhat, Zoheir Kipouros, Georges J. Materials Engineering Program Department of Process Engineering and Applied Science Dalhousie University 1360 Barrington Street Halifax NS B3H 4R2 Canada School of Material Science and Engineering Nanchang Hangkong University 696 Fenghenan Road Nanchang Jiangxi 330063 China

ISBN: (纸本)9781629933092

Electroless nickel-phosphorus coatings are important for corrosion and wear protection. The preparation of electroless nickel-phosphorus coating on carbon steel substrate in an ammonia free friendly bath consisting of Nichem 1125-2A 75g/L and Nichem 1125-2B 230g/L at a temperature of 89°C and pH of 4.8 for 90 minutes was studied. Optical microscopy(OM), field emission scanning electron microscopy (FESEM), energy dispersive spectroscopy (EDS), x-ray diffraction (XRD) were utilized to characterize the deposits. A nanoindentation system and a dry reciprocating wear test were used to investigate microhardness and wear resistance, respectively. A homogeneous coating with good adherence was produced. Structural characterization suggests that the deposited Ni-P coating has an amorphous structure with 9-11 wt.% phosphorus content. The micro-hardness of Ni-P coating is more than twofold that of substrate, indicating the coating can improve the hardness of carbon steel. The wear rates and steady state friction coefficients of Ni-P coating and carbon steel are 4.77×10 -2 mg/m, 0.37 and 5.63×10-2 mg/m, 0.51, respectively, at a load of 6N under dry sliding condition, This reveals that the Ni-P coating can offer better wear resistance compared to carbon steel. Copyright © 2013 MS&T'13®.

关键词： Wear resistance

来源：评论

学校读者我要写书评

暂无评论

Gene Therapy: Suppression of VEGF by Reversible‐PEGylated Histidylated Polylysine in Cancer Therapy (Adv. Healthcare Mater. 11/2014)

引用

Advanced Healthcare materials 2014年第11期3卷

作者： Xiaojun Cai Haiyan Zhu Haiqing Dong Yongyong Li Jiansheng Su Donglu Shi Shanghai East Hospital The Institute for Biomedical Engineering and Nano Science Tongji University School of Medicine Tongji University Shanghai 200120 China Laboratory of Oral Biomedical Science and Translational Medicine Department of Prosthodontics School of Stomatology Tongji University Shanghai 200072 China Materials Science and Engineering Program Department of Mechanical and Materials Engineering College of Engineering and Applied Science University of Cincinnati Cincinnati OH 10 45221 USA

来源：评论

学校读者我要写书评

暂无评论

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

请选择保存的检索档案：

请选择收藏分类：

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

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

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：