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2011 1st Middle East Conference on Biomedical engineering, MECBME 2011

作者： Trabzon, Levent Ramazanoglu, Mustafa Kizil, Huseyin Guvendik, Sebahattin Istanbul Technical University Department of Mechanical Engineering Materials and Manufacturing Division Inonu Cad. No: 65 Gumussuyu 34467 Istanbul Turkey Istanbul University Faculty of Dentistry Capa 34390 Istanbul Turkey Istanbul Technical University Department of Metallurgical and Materials Engineering Maslak 34469 Istanbul Turkey Istanbul Technical University Program of Materials Science and Engineering Institute of Science and Technology Maslak 34469 Istanbul Turkey

ISBN: (纸本)9781424470006

We successfully engineered Si nano-columns with different cross-sectional geometries by e-beam evaporation with an angle between source and substrate. The Si nano-columns were grown as pillars with square, triangle and linear cross sections in in-plane. Mesenchymal stem cells (MSCs) isolated from the bone marrow stroma of young adult rats were cultured on these different Si nanosurfaces. We found that the behaviour of MSCs highly depended on the geometry of nano-topography so that mesenchymal stem cells were differentiated and induced CaP precipitation on square-cross-sectional Si nano-columns without growth factor in the culture medium. © 2011 IEEE.

关键词： Stem cells

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Design, implementation and analysis of fully digital 1-D controllable multiscroll chaos

Design, implementation and analysis of fully digital 1-D con...

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International Conference on Microelectronics, ICM

作者： A. S. Mansingka A. G. Radwan K. N. Salama Electrical Engineering Program Division of Physical Sciences and Engineering King Abdullah University of Science and Technology Thuwal Saudi Arabia Department of Engineering Mathematics Faculty of Engineering Cairo University Cairo Egypt

This paper introduces the fully digital implementation of a 1-D multiscroll chaos generator based on a staircase nonlinearity in the 3rd-order jerk system using the Euler approximation. For the first time, digital design is exploited to provide real-time controllability of (i) number of scrolls, (ii) position in 1-D space, (iii) Euler step size and (iv) system parameter. The effect of variations in these fields on the maximum Lyapunov exponent (MLE) is analyzed. The system is implemented using Verilog HDL and synthesized on an Xilinx Virtex 4 FPGA, exhibiting area utilization less than 3.5% and high performance with experimentally verified throughput up to 3.33 Gbits/s. This fully digital system enables applications in modulation schemes and chaos-based cryptosystems without analog to digital conversion.

关键词： Maximum likelihood estimation Chaotic communication Generators Field programmable gate arrays Approximation methods Hardware design languages

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On the ergodic secrecy capacity of the wiretap channel under imperfect main channel estimation

On the ergodic secrecy capacity of the wiretap channel under...

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Asilomar Conference on Signals, Systems & Computers

作者： Zouheir Rezki Ashish Khisti Mohamed-Slim Alouini Electrical Engineering Program Physical Science and Engineering Division King Abdullah University for Science and Technology Thuwal Makkah Saudi Arabia Electrical and Computer Engineering Department University of Toronto Toronto ONT Canada

ISBN: (纸本)9781467303217

The ergodic secrecy capacity of the wiretap channel is known when the main channel (between the transmitter and the legitimate receiver) state information (CSI) is perfect at the transmitter and the coherence period is sufficiently large to enable random coding arguments in each block. In a fast fading scenario, when the codeword length spans many coherence periods, the secrecy capacity is still not known. In this paper, we present a framework that characterizes this secrecy capacity under imperfect main channel estimation at the transmitter. Inner and outer bounds on the ergodic secrecy capacity are derived for a class of independent identically distributed (i.i.d.) fading channels. The achievable rate is a simple on-off scheme using a Gaussian input. The upper bound is obtained using an appropriate correlation scheme of the main and the eavesdropper channels. The upper and the lower bounds coincide with recently derived ones in the perfect main CSI extreme. Furthermore, the lower bound matches the upper bound in no main CSI extreme, where the secrecy capacity is equal to zero. Numerical results are provided for independent identically distributed (i.i.d.) Rayleigh fading channels.

关键词： Integrated circuits Channel estimation Signal to noise ratio Cryptography Antennas

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Development of a neutron depth profiling facility for characterizing advanced reactor materials

Development of a neutron depth profiling facility for charac...

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2011 ANS Annual Meeting

作者： Turkoglu, Danyal J. Kandlakunta, Praneeth Mulligan, Padhraic L. Cao, Lei Zhang, Jinsuo Sang, Byun Thak Downing, R. Greg Nuclear Engineering Program Department of Mechanical and Aerospace Engineering Ohio State University Columbus OH United States Los Alamos National Laboratory Decision and Application Division Los AlamosNM United States Oak Ridge National Laboratory Materials Science and Technology Division Oak Ridge TN United States National Institute of Standards and Technology Gaithersburg MD United States

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Improvement of transmittance by fabricating broadband subwavelength anti-reflection structures for polycarbonate

Improvement of transmittance by fabricating broadband subwav...

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作者： Jang, H.S. Kim, J.H. Kim, K.S. Jung, G.Y. Lee, J.J. Kim, G.H. Division of Nano and Bio Technology Daegu-Gyeongbuk Institute of Science and Technology Dalseo-gu Daegu 704-230 Korea Republic of Department of Material Science and Engineering Program for Integrated Molecular System Gwangju Institute of Science and Technology Gwangju 500-712 Korea Republic of Nano-Mechanical Systems Research Division Korea Institute of Machinery and Materials Daejeon 305-343 Korea Republic of

We report on how to increase transmittance of a 0.2 mm thick polycarbonate (PC) film by periodic subwavelength anti-reflection structures in the visible spectral range. Subwavelength anti-reflection structures like moth-eyes are fabricated into the polycarbonate substrate itself by thermal nanoimprinting lithography (TH-NIL), which uses silicon stamps that have periodic structures such as gratings (lines and spaces) and pillared dots, and are fabricated by laser interference lithography (LIL) and transformer coupled plasma etching. To increase transmittance of a polycarbonate film, we control the periods and shapes of patterns, the number of patterned surfaces, and the overlapping direction of patterns that are fabricated into its surfaces. As a result of this, we show that average transmittance improves as the pattern period gets shorter and as both surfaces of the film are patterned. We also show that the spectrum range gets larger as the pattern period gets shorter and is determined by the longer pattern period in the case of designing a film to have different pattern period on its surfaces. The maximum average transmittance of a polycarbonate film increases up to approximately 6% compared to a bare sample in the 470-800 nm spectral range. Copyright © 2011 American Scientific Publishers All rights reserved.

关键词： Polycarbonates

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On the ergodic capacity of legacy systems in the presence of next generation interference

On the ergodic capacity of legacy systems in the presence of...

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International Symposium on Wireless Communication Systems (ISWCS)

作者： Nurul H. Mahmood Ferkan Yilmaz Mohamed-Slim Alouini Geir E. Øien Department of Electronics & Telecomunications Norwegian University of Science and Technology Trondheim Norway Electrical Engineering Program Division of Physical Sciences and Engineering King Abdullah University of Science and Technology (KAUST) Thuwal Makkah Saudi Arabia

Next generation wireless systems facilitating better utilization of the scarce radio spectrum have emerged as a response to inefficient rigid spectrum assignment policies. These are comprised of intelligent radio nodes that opportunistically operate in the radio spectrum of existing legacy systems; yet unwanted interference at the legacy receivers is unavoidable. In order to design efficient next generation systems and to minimize their harmful consequences, it is necessary to realize their impact on the performance of legacy systems. In this work, a generalized framework for the ergodic capacity analysis of such legacy systems in the presence of interference from next generation systems is presented. The analysis is built around a model developed for the statistical representation of the interference at the legacy receivers, which is then used to evaluate the ergodic capacity of the legacy system. Moreover, this analysis is not limited to the context of legacy systems, and is in fact applicaple to any interference limited system. Findings of analytical performance analyses are confirmed through selected computer-based Monte-Carlo simulations.

关键词： Interference Receivers Next generation networking Fading Transmitters Analytical models Wireless sensor networks

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Large Exchange Bias after Zero-Field Cooling from an Unmagnetized State

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physical Review Letters 2011年第7期106卷 077203-077203页

作者： B. M. Wang Y. Liu P. Ren B. Xia K. B. Ruan J. B. Yi J. Ding X. G. Li L. Wang School of Mechanical and Aerospace Engineering Nanyang Technological University 639798 Singapore Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University 637371 Singapore Department of Materials Science and Engineering National University of Singapore 119260 Singapore Hefei National Laboratory for Physical Sciences at Microscale and Department of Physics University of Science and Technology of China Hefei 230026 China

Exchange bias (EB) is usually observed in systems with an interface between different magnetic phases after field cooling. Here we report an unusual phenomenon in which a large EB can be observed in Ni-Mn-In bulk alloys after zero-field cooling from an unmagnetized state. We propose that this is related to the newly formed interface between different magnetic phases during the initial magnetization process. The magnetic unidirectional anisotropy, which is the origin of the EB effect, can be created isothermally below the blocking temperature.

关键词： Cooling

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High spatial resolution sensing of cytokine secretion by nano-plasmonic-resonator array

High spatial resolution sensing of cytokine secretion by nan...

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Frontiers in Optics, FiO 2011

作者： Wang, Sheng Ota, Sadao Guo, Bin Ryu, Jongeun Rhodes, Christopher Xiong, Yi Kalim, Sheraz Zeng, Li Chen, Yong Teitell, Michael A. Zhang, Xiang University of California Berkeley CA 94720 United States Department of Mechanical and Aerospace Engineering University of California Los Angeles CA 90095 United States Department of of Pathology and Laboratory Medicine University of California Los Angeles CA 90095 United States Material Science Division and Physical Bioscience Division Lawrence Berkeley National Laboratory Berkeley CA 94720 United States

Sub-micron resolution quantitative mapping of endogenous cytokine secretion from individual T cells is realized by an in-situ immunoassay based on giant optical enhancement of a tunable-nano-plasmonicresonator (TNPR) ... 详细信息

ISBN: (纸本)9781557529176

关键词： Physiology

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3-D hierarchical wrinkled micro-pillars for anti-cells proliferation surfaces

3-D hierarchical wrinkled micro-pillars for anti-cells proli...

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IEEE Nanotechnology Materials and Devices Conference (NMDC)

作者： Yudi Rahmawan Kwang-Ryeol Lee Myoung-Woon Moon Kahp-Yang Suh Interdisciplinary Fusion Technology Division Korea Institute of Science and Technology Seoul South Korea WCU Program for Multiscale Mechanical Design School of Mechanical and AeroSpace Engineering Seoul National University Seoul South Korea

Fabrication of dual-scale roughness in a large area of biocompatible superhydrophobic surfaces was presented in this paper. Three dimensional (3-D) dual-scale roughness was achieved using a combination of top-down process by replica molding to make an ordered micro-pillars on poly-(dimethylsiloxane) (PDMS) as the soft base material and bottom-up process by deposition of diamond like amorphous carbon (DLC) as a hard-coating using radio frequency-chemical vapor desposition (RF-CVD) to produce nanoscale wrinkle structures. The extreme superhydrophobicity of the as-prepared surfaces was used as the culturing template of calf pulmonary artery endothelial (CPAE) cells for 3 days. We discovered that CPAE cells will be more adhered on surfaces with only microstructure compared to hierarchical structures. In particular, the reduced filopodia extension during cell growth was caused by disconnected focal adhesions on the pillar pattern. This limited cell adhesion could prevent undesired growth and proliferation of biological species on the surface of biomedical devices such as stents, implants or even injection syringes.

关键词： Educational institutions

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Inside Back Cover: In Vitro and In Vivo Uncaging and Bioluminescence Imaging by Using Photocaged Upconversion Nanoparticles (Angew. Chem. Int. Ed. 13/2012)

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Angewandte Chemie International Edition 2012年第13期51卷

作者： Yanmei Yang Qing Shao Renren Deng Chao Wang Xue Teng Kai Cheng Prof. Zhen Cheng Prof. Ling Huang Prof. Zhuang Liu Prof. Xiaogang Liu Prof. Bengang Xing Division of Chemistry and Biological Chemistry School of Physical & Mathematical Sciences Nanyang Technological University Singapore 637371 (Singapore) Department of Chemistry National University of Singapore 3 Science Drive 3 Singapore 117543 (Singapore) Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices Institute of Functional Nano & Soft Materials Soochow University (P. R. China) Division of Biomedical Engineering School of Chemical and Biomedical Engineering Nanyang Technological University (Singapore) Molecular Imaging Program at Stanford (MIPS) Department of Radiology Stanford University Medical Center (USA) Institute of Materials Research and Engineering Agency for Science Technology and Research (A*STAR) 3 Research Link Singapore 117602 (Singapore) Xiaogang Liu Department of Chemistry National University of Singapore 3 Science Drive 3 Singapore 117543 (Singapore) Bengang Xing Division of Chemistry and Biological Chemistry School of Physical & Mathematical Sciences Nanyang Technological University Singapore 637371 (Singapore)

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