检索结果-内蒙古大学图书馆

2008 MRS Fall Meeting

作者： Gosnell, Jonathan D. Weiss, Sharon M. Interdisciplinary Graduate Program in Materials Science Vanderbilt University Station B 350106 Nashville TN 37235 United States Department of Electrical Engineering and Computer Science Vanderbilt University Station B 351824 Nashville TN 37235 United States

ISBN: (纸本)9781615677740

In order for solid state lighting technology to become a mainstream technology, one of the major challenges to overcome is increasing the efficiency of these devices while maintaining a proper color balance. A significant source of efficiency loss in commercial phosphor-based white light-emitting diodes (LEDs) is light scattering off large, micron-sized phosphor particles. The use of recently reported single-size CdSe white-light nanocrystals in place of traditional phosphors, such as YAG:Ce3+, could lead to lower scattering losses and higher device efficiencies as a result of the extremely small CdSe core diameter of approximately 1.5 nm. This work theoretically and experimentally investigates the absorption, scattering, and extinction coefficients and cross sections of CdSe white-light nanocrystals in comparison to YAG:Ce3+ phosphor particles. Calculations were performed based on the Rayleigh approximation and Mie theory of scattering. Experiments were carried out using thin films of encapsulated nanocrystals. By measuring the absorbance and thickness of the films, in addition to the concentration of the nanocrystals, extinction coefficients and cross sections were determined using the Beer-Lambert law. A reasonable agreement was obtained between theoretical and experimental data showing that the size of the particle has a significant impact on the extinction, absorption, and scattering properties of thin films. The considerably reduced scattering from the nanocrystals compared to traditional phosphors, along with their inherent high quality white light emission, makes them a promising candidate for future solid state lighting applications. © 2009 materials Research Society.

关键词： Cadmium compounds

来源：评论

学校读者我要写书评

暂无评论

Application of an elastic biodegradable poly(L-lactide-co-Ε- caprolactone) scaffold for cartilage tissue regeneration

Application of an elastic biodegradable poly(L-lactide-co-Ε...

引用

作者： Jung, Youngmee Kim, Soo Hyun You, Hee Jin Kim, Sang-Heon Ha Kim, Young Min, Byoung Goo Biomaterials Research Center Korea Institute of Science and Technology P.O. Box 131 Cheongryang Seoul 136-650 Korea Republic of Interdisciplinary Program in Medical and Biological Engineering Major Seoul National University Seoul Korea Republic of Department of Materials Science and Engineering Gwangju Institute of Science and Technology Gwangju Korea Republic of Department of Biomedical Engineering Seoul National University Seoul Korea Republic of

In cartilage tissue regeneration, it is important that an implant inserted into a defect site can maintain its mechanical integrity and endure stress loads from the body, in addition to being biocompatible and able to induce tissue growth. These factors are crucial in the design of scaffolds for cartilage tissue engineering. We developed an elastic biodegradable scaffold from poly(L-lactideco-Ε-caprolactone) (PLCL) for application in cartilage treatment. Biodegradable PLCL co-polymer was synthesized from L-lactide and Ε-caprolactone in the presence of stannous octoate as a catalyst. A highly elastic PLCL scaffold was fabricated by a gel-pressing method with 80% porosity and 300-500 μm pore size. The tensile mechanical and recovery tests were performed in order to examine mechanical and elastic properties of the PLCL scaffold. They could be easily twisted and bent and exhibited almost complete (over 94%) recoverable extension up to breaking point. For examining cartilaginous tissue formation, rabbit chondrocytes were seeded on scaffolds. They were then cultured in vitro for 5 weeks or implanted in nude mice subcutaneously. From in vitro and in vivo tests, the accumulation of extracellular matrix on the constructs showed that chondrogenic differentiation was sustained onto PLCL scaffolds. Histological analysis showed that cells onto PLCL scaffolds formed mature and well-developed cartilaginous tissue, as evidenced by chondrocytes within lacunae. From these results, we are confident that elastic PLCL scaffolds exhibit biocompatibility and as such would provide an environment where cartilage tissue growth is enhanced and facilitated. © 2008 VSP.

关键词： Tissue regeneration

来源：评论

学校读者我要写书评

暂无评论

Cartilaginous tissue formation using human adipose tissue derived stromal cells and TGF-β1 loaded functional nanoparticle-hydrogel-PLCL complex

Cartilaginous tissue formation using human adipose tissue de...

引用

8th World biomaterials Congress 2008, WBC 2008

作者： Jung, Youngmee Kim, Soo Hyun Chung, Yong-Il Tae, Giyoong Kim, Sang-Heon Kim, Young Ha Lee, Jong Won Min, Byoung Goo Biomaterials Research Center Korea Institute of Science and Technology Seoul Korea Republic of Interdisciplinary Program in Medical and Biological Engineering Major Seoul National University Seoul Korea Republic of Department of Materials Science and Engineering Gwangju Institute of Science and Technology Gwangju Korea Republic of Department of Plastic Surgery Catholic University of Korea Seoul Korea Republic of Department of Biomedical Engineering Seoul National University Seoul Korea Republic of

来源：评论

学校读者我要写书评

暂无评论

Temperature Dependent Fluorescence of Nanocrystalline Ce-doped Garnets For Use as Thermographic Phosphors

引用

MRS Online Proceedings Library 2008年第1期1076卷 1-6页

作者： Hansel, Rachael Allison, Steve Walker, Greg Interdisciplinary Graduate Program in Materials Science Vanderbilt University Nashville USA Oak Ridge National Laboratory Oak Ridge USA Department of Mechanical Engineering Vanderbilt University Nashville USA

Four samples of (Y1−xCex)3(Al1−y Gay)5O12 (where x=0.01, 0.02 and y=0, 0.5) were synthesized via the simple, efficient combustion synthesis method in order to determine the effect of substituting Ga3+ for Al3+ on the temperature-dependent fluorescent lifetime. X-ray diffraction shows that the Ga-doped samples have longer lattice constants and transmission electron microscopy data show that each sample consists of nanocrystallites which have agglomerated in micron-sized particles. Photoluminescence data reveal that the addition of gallium into the YAG:Ce matrix induces a red shift in the absorption spectra and a blue-shift in the emission spectra. The laser-induced fluorescent lifetime was determined as a function of temperature over the range of 0-125°C using two different emission filters. Increasing the amount of dopant ultimately results in a decrease of the fluorescent lifetime. The quenching temperatures for the Ga-doped samples were lower than the samples without gallium. The results of this work show that combustion synthesis is viable method for making highly luminescent, nanocrystalline TGPs. In addition, these results show that the quenching temperature of YAG:Ce can be altered by substituting ions which alter the location of the charge transfer state and by changing the morphology of the sample.

关键词： crystalline sensor dopant

来源：评论

学校读者我要写书评

暂无评论

Nanoscale porous silicon waveguides for biosensing applications

Nanoscale porous silicon waveguides for biosensing applicati...

引用

21st Annual Meeting of the IEEE Lasers and Electro-Optics Society, LEOS 2008

作者： Rong, G. Wei, X. Kang, C. Liscidini, M. Sipe, J.E. Mernaugh, R.L. Weiss, S.M. Department of Electrical Engineering and Computer Science Vanderbilt University Nashville TN 37235 United States Interdisciplinary Graduate Program in Materials Science Vanderbilt University Nashville TN 37235 United States Department of Physics Institute for Optical Sciences University of Toronto Toronto ON M5S 1A7 Canada Department of Biochemistry Vanderbilt University Nashville TN 37235 United States

Nanoscale porous silicon waveguides, both on silicon substrates and free-standing membranes, are explored for biosensing applications. Measured detection limits in the nanomolar range are reported for DNA sensing. ... 详细信息

ISBN: (纸本)9781424419326

关键词： Porous silicon

来源：评论

学校读者我要写书评

暂无评论

Linear and nonlinear plasmonic effects modulated by a metalinsulator transition

Linear and nonlinear plasmonic effects modulated by a metali...

引用

IEEE/LEOS Winter Topical Meeting Series

作者： R. F. Haglund E. U. Donev L. C. Feldman D. W. Ferrara R. Lopez J. Y. Suh K.A. Tetz Department of Physics and Astronomy Interdisciplinary Graduate Program in Materials Science and Vanderbilt Institute for Nanoscale Science and Engineering Vanderbilt University Nashville TN USA Department of Physics and Astronomy and Department of Materials Science and Engineering Rutgers University Piscataway NJ USA Department of Physics and Astronomy and Institute for Advanced Materials Nanoscience and Technology North Carolina State University Chapel Hill NC USA

Localized and propagating plasmonic effects in noble-metal nanostructures are receiving worldwide attention as potential enabling principles for optical and electro-optic devices. A critical need in plasmonic device design is a general technique for active modulation of the plasmon response. In this paper, we describe the use of a reversible, solid-solid phase transition in VO 2 to modulate plasmonic response. Case studies are drawn from experiments on nano structured hole and particle arrays in which VO 2 acts as a modulator by altering the local dielectric constant.

关键词： Plasmons Optical devices Optical propagation Nanostructures Nonlinear optical devices Nonlinear optics Optical modulation Electrooptic devices Phase modulation Dielectric constant

来源：评论

学校读者我要写书评

暂无评论

Nanoscale porous silicon waveguides for biosensing applications

Nanoscale porous silicon waveguides for biosensing applicati...

引用

IEEE Photonics Conference (IPC)

作者： G. Rong X. Wei C. Kang M. Liscidini J. E. Sipe R. L. Mernaugh S. M. Weiss Department of Electrical Engineering and Computer Science Vanderbilt University Nashville TN USA Interdisciplinary Graduate Program in Materials Science Vanderbilt University Nashville TN USA Department of Physics and Institute for Optical Sciences University of Toronto Toronto ONT Canada Department of Biochemistry Vanderbilt University Nashville TN USA

关键词： Silicon Biosensors Optical waveguides Gratings Biomembranes Resonance DNA Biological materials Optical materials Optical surface waves

来源：评论

学校读者我要写书评

暂无评论

NONCOVALENT SURFACE MODIFICATION OF MULTIWALLED CARBON NANOTUBES WITH CHITOSAN:EFFECT OF DEGREE OF DEACETYLATION

NONCOVALENT SURFACE MODIFICATION OF MULTIWALLED CARBON NANOT...

引用

第十四届世界食品科技大会

作者： Chularat Iamsamai Stephan T.Dubas Uracha Ruktanonchai Apinan Soottitantawat Supot Hannongbua Nanoscience and Technology Program Graduate SchoolChulalongkom University Bangkok 10330 THAILAND Metallurgy and Materials Science Research Institute Chulalongkom University Bangkok 10330 THAILAND National Nanotechnology Center National Science and Technology Development Agency Pathumthani 1212 Department of Chemical Engineering Faculty of Engineering Chulalongkom UniversityBangkok 10330 TH Department of Chemistry Faculty of Science Chulalongkorn University Bangkok 10330 THAILAND

In this research,Chitosan has been used for the noncovalent modification of multiwalled carbon nanotubes (MWNTs) and improve their dispersion in *** order to be able to integrate MWNTs with biological systems,it is critical that the solubility of the MWNTs be improved due to their poor solubility in most *** varying the reaction of time of chitin in concentrated NaOH,Chitosan samples with different % degree of deacetylation (%DD) (58%,76%,81%,91%,and 94%) were prepared.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Strategy for ubiquitous titanium alloys

引用

Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals 2008年第12期72卷 915-915页

作者： Niinomi, Mitsuo Hanawa, Takao Ikeda, Masahiko Chiba, Akihiko Furuhara, Tadashi Narushima, Takayuki Tsuchiya, Koichi Emura, Satoshi Nakano, Takayoshi Takenaka, Toshihide Institute for Materials Research Tohoku University Katahira 2-1-1 Sendai 980-8577 Institute for Biomaterials and Bioengineering 2-3-10 Surugadai Kanda Chiyoda-ku Tokyo 101-0062 Faculty of Chemistry Materials and Bioengineering Kansai University 3-3-35 Yamate Suita 564-8680 Osaka Graduate School of Engineering Tohoku Unversity 6-6 Aoba Aramaki Aoba-ku Sendai 980-8579 National Institute for Materials Science 1-2-1 Sengen Tsukuba 305-0047 Graduate School of Engineering Osaka University 2-1 Yamada-oka Suita 565-0871 Deaprtment of Production Systems Engineering Toyohashi University of Technology 1-1 Hibarigaoka Tempaku-cho Toyohashi 441-8580

来源：评论

学校读者我要写书评

暂无评论

Crystal Growth and Plastic Deformation Behavior of Ti-29Nb-13Ta-4.6Zr Bcc-Based Single Crystal 11

Crystal Growth and Plastic Deformation Behavior of Ti-29Nb-1...

引用

11th World Conference on Titanium, Ti-2007

作者： Nakano, Takayoshi Hagihara, Koji Maki, Hideaki Umakoshi, Yukichi Niinomi, Mitsuo Division of Materials and Manufacturing Science Graduate School of Engineering Osaka University Osaka Suita565-0871 Japan Department of Biomaterials Science Institute for Materials Research Tohoku University Sendai980-8577 Japan

ISBN: (纸本)9784889034066

A Ti-29Nb-13Ta-4.6Zr (mass.%) alloy with a bcc structure has been of great interest as a biomaterial for bone replacement due to its low cyto-toxicity and low Young's modulus. A single crystal of this alloy has been successfully obtained by using an optical floating zone method, in spite of its being a quaternary alloy. Thus, compression and fatigue behaviors of the Ti-Nb-Ta-Zr single crystal were investigated by focusing on the precipitation of the α and ω phases. The constituent phases of the single crystal strongly depend on the heat treatment: single-phase β (bcc structure) just after the solution treatment at 1063 K, two-phase (β+ω) annealed at 573 K and 593 K, three-phase (β+ω+α) annealed at 673 K, and two-phase (β+α) annealed at 723 K. Yield stress, fracture strain, deformation mode of slip or {332} twinning, cyclic hardening and softening, and fatigue life at room temperature strongly depend on the constituent phases. In compression, moreover, slip plane and deformation mode change depending on the loading axis (χ), similar to the effects in other bcc alloys. In this article, we describe the single-crystal growth, the constituent phases, and the plastic deformation behavior in compression as well as the cyclic deformation behavior. © Ti-2007 - Proceedings of the 11th World Conference on Titanium. All Rights Reserved.

关键词： Niobium alloys

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：