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Materials Science and Technology Conference and Exhibition, MS and T'07 - "Exploring Structure, Processing, and Applications Across Multiple Materials Systems"

作者： Nergiz, S. Kiziltas, G. Materials Science and Engineering Faculty of Engineering and Natural Sciences Sabanci University Istanbul Turkey Mechatronics Engineering Faculty of Engineering and Natural Sciences Sabanci University Istanbul Turkey

ISBN: (纸本)9781605601335

Spatially variable composites of Calcium Magnesium Titanates(CMT) with dielectric permittivity 15, 20 and 70 and commercial ferrite were produced by Dry Powder Deposition (DPD) method followed by cosintering at elevated temperatures. Thermogravimetric analysis of each constituent powder was used to analyze efficient removal of 1-3 % binder content of spray dried ferrite and CMT powders and achieve complete sintering of their textured composites. Smooth, monolithic dielectric and magneto-dielectric textured composites were obtained by cosintering at 1450 C for 4 hours that were compacted at 50 bar in a 12 *13 grid with 3 mm pixels and a thickness of 5mm. We reduced thermal mismatch effects of constituents observed at temperatures below 1450 C and prevented cracks and unwanted defects such as porosities in textured composites. Density measurements and SEM stressed that we finally obtained over >%98 dense ceramic constituents. Microstructural characterizations of pellets made of sintered constituent material were carried out by SEM. We present in this paper that textured monolithic dielectric and magneto-dielectric composites of various shades could be produced by DPD method which is an efficient way for production of spatially variable multimaterial dielectric substrates suitable for various antenna and filter applications. Copyright © 2007 MS&T'07®.

关键词： Dielectric materials

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Correlation Between Defective NK Activity and Low Expression of CD16, NKp44 and NKG2D in Beta Thalassemia Patients

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Blood 2008年第11期112卷 5425-5425页

作者： Belkis Atasever Serap Erdem Kuruca Zeynep Karakas Batu Erman Arzu Ergen Turgay Isbir Physiology Department Istanbul University Istanbul Faculty of Medicine Istanbul Turkey Pediatrics Department Istanbul University Istanbul Faculty of Medicine Istanbul Turkey Faculty of Engineering and Natural Sciences Biological Sciences & Bioengineering Program Sabanci University Istanbul Turkey Department of Molecular Medicine Istanbul University Institute of Experimental Medicine Istanbul Turkey

Beta thalassemia patients have a major global impact on health and mortality and are characterized by absence of beta globin chain production. In most patients, multiple blood transfusions can induce differences of immune response Therefore, they are often associated with bone marrow expansion and immunodeficiency in terms of lymphocyte subsets and cytokine levels in the peripheral blood and presence of alloantibodies. We have previously shown that children with beta thalassemia major have had decreased NK cells. natural killer (NK) cells are lymphocyte subpopulations that are important effectors of innate immune responses against infectious pathogens and tumor cells. The cytotoxic activity of NK cells is regulated by the equilibrium between positive and negative signals from multiple receptors expressed on their cell surface; signals that can trigger the cytolytic machinery as well as cytokine or chemokine secretion. The activator receptors of NK cells are natural cytotoxicity receptors (NCR) and NKG2D. NCR are represented by NKp46, NKp44, and NKp30. These receptors, upon engagement by their specific ligands, induce a strong activation of NK-mediated cytotoxic activity. NKp44, a triggering receptor selectively expressed by activated NK cells. NK cells can make cytolytic function by regulating pro-inflammatory cytokines as IFN-gamma, TNF-alpha and IL10. This study was carried out to investigate details NK cell function of 27 transfusion-dependent children with beta thalassemia. Data from 18 age- and sex-balanced children served as controls. For this purpose, we analyzed their cytolytic function against K562 cells in both pure NK cells (CD56 + CD16 + CD3 − ) and PBMC. Before and after the assessment of NK activity, we have examined the levels of NK activating receptors expressed on NK cells. The expression levels of the activation receptors (NKp30, NKp44, NKG2D) on CD56 + CD16 + CD3 − NK cells was quantified by multicolour immunofluorescent analysis using flow cytome

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Analog sliding mode controller for position tracking of piezoelectric actuators

Analog sliding mode controller for position tracking of piez...

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Mediterranean Conference on Control and Automation (MED)

作者： S. Yannier A. Sabanovic Faculty of Engineering and Natural Sciences Mechatronics Engineering Program Sabanci University Istanbul Turkey

In this work, analog application for the sliding mode control (SMC) of piezoelectric actuators is presented. DSP application of the algorithm suffers from ADC and DAC conversions and faces speed limitations. Moreover, piezoelectric actuators are known to have very large bandwidth close to the DSP operation frequency. Therefore, with the direct analog application, improvement of the performance is expected and high frequency operation will be achieved. First an appropriate SMC is designed to have continuous control output and then experimental results for position tracking using DSP and analog application are presented for comparison.

关键词： Sliding mode control Piezoelectric actuators Digital signal processing Open loop systems Atomic force microscopy Bandwidth Frequency Aerospace materials Hysteresis Capacitive sensors

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Optimization of broaching design

Optimization of broaching design

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IIE Annual Conference and Expo 2007 - Industrial engineering's Critical Role in a Flat World

作者： Özelkan, Ertunga C. Öztürk, Özkan Budak, Erhan Engineering Management Program Center for Lean Logistics and Engineered Systems University of North Carolina at Charlotte Charlotte NC 28223 United States Department of Mechanical Engineering Center for Precision Metrology University of North Carolina at Charlotte Charlotte NC 28223 United States Faculty of Engineering and Natural Sciences Sabanci University Istanbul Turkey

Broaching is one of the most recognized machining processes that can yield high productivity and high quality when applied properly. One big disadvantage of broaching is that all process parameters, except cutting speed, are built into the broaching tools. Therefore, it is not possible to modify the cutting conditions during the process once the tool is manufactured. Optimal design of broaching tools has a significant impact to increase the productivity and to obtain high quality products. In this paper, an optimization model for broaching design is presented. The model results in a non-linear non-convex optimization problem. Analysis of the model structure indicates that the model can be decomposed into smaller problems. The model is applied on a turbine disc broaching problem which is considered as one of the most complex broaching operations.

关键词： Machining

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Sliding mode control application to nano positioners

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Lecture Notes in Control and Information sciences 2006年 334卷 395-421页

作者： Sabanovic, Asif Abidi, Khalid Önal, Çaǧdaş Sabanci University Faculty of Engineering Natural Sciences Mechatronics Program Turkey

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A Novel 1.5 $^primeprime$ Quadruple Antenna for Tri-Band GPS Applications

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IEEE Antennas and Wireless Propagation Letters 2006年 5卷 224-227页

作者： Y. Zhou S. Koulouridis G. Kiziltas J. L. Volakis Electroscience Laboratory Electrical and Computer Engineering Department Ohio State Uinversity Columbus OH USA Mechatronics Program of the Faculty of Engineering and Natural Sciences Sabanci University Istanbul Turkey

A new global positioning system (GPS) antenna is proposed to cover the three GPS bands (L1, L2, and L5, namely 1575, 1227, and 1176 MHz) with the L5 band to be added after 2006. The developed antenna size is only $1.5^primeprimetimes 1.5^primeprime$ in aperture corresponding to $lambda/7timeslambda/7$ $(lambda=hboxfree hboxspace hboxwavelength)$ and $lambda/13 hboxthick$. Quadrature feeding is employed to ensure right-hand circular polarized (RHCP) radiation. The final miniature antenna exhibits a gain greater than 2 dBi, and to our knowledge this is the smallest such size for circular polarized (CP) operation covering all three bands. Detailed parametric simulations leading to the best design along with measurements for the constructed antenna are presented.

关键词： Global Positioning System Conductors Dielectric substrates Bandwidth Resonance Aperture antennas Polarization Shape Permittivity Antenna measurements

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118 Coreceptor Tuning: IL-7 Signals Transcriptionally Tailor CD8 Coreceptor Expression in CD8 T Cells to the Self-specificity of their TCR

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Cytokine 2007年第1期39卷 32-32页

作者： Jung-Hyun Park Stanley Adoro Philip J. Lucas Sophia D. Sarafova Amala Alag Loretta L. Doan Batu Erman Xiaolong Liu Wilfried Ellmeier Remy Bosselut Lionel Feigenbaum Alfred Singer Experimental Immunology Branch National Cancer Institute NIH Bethesda MD USA Immunology Graduate Group University of Pennsylvania Philadelphia PA USA Experimental Transplantation and Immunology Branch National Cancer Institute NIH Bethesda MD USA Biological Sciences and Bioengineering Program Faculty of Engineering and Natural Sciences Sabanci University Istanbul Turkey Immune Cell Biology Branch National Cancer Institute NIH Bethesda MD USA Institute of Immunology Medical University of Vienna Vienna Austria SAIC-Frederick NCI-Frederick Cancer Research and Development Center Frederick MD USA

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Bilateral control with a reflex mechanism on the slave side

Bilateral control with a reflex mechanism on the slave side

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IECON 2005: 31st Annual Conference of IEEE Industrial Electronics Society

作者： Onal, Cagdas Denizel Sabanovic, Asif Sabanci University Faculty of Engineering and Natural Sciences Mechatronics Program Istanbul 34956 Turkey

ISBN: (纸本)0780392523

In this work, we are presenting a sliding mode controller approach for bilateral control. The controller consists of sliding mode force and hybrid (force/position) controllers for master and slave sides, respectively. Main issues such as transparency and time delay have been adressed in the derivation and the implementation of the controller. The approach takes the overall system (unified master and slave sides) as one system and therefore uses the transparency aims of the other approaches as the means for the derivation of the controller. It also makes use of a "reflex mechanism" to protect the slave side and its environment in case of large time delays, which disables the operator to react in time. The effectiveness of the proposed control scheme is evaluated experimentally and a maximum position error of one step increment of the encoder and a maximum torque error of 3 × 10-6Nm are achieved. ©2005 IEEE.

关键词： Control systems

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Optimal distribution of carbon nanotubes in gas sensor design

Optimal distribution of carbon nanotubes in gas sensor desig...

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2005 5th IEEE Conference on Nanotechnology

作者： Eriten, Melih Yesilyurt, Serhat Mechatronics Program Faculty of Engineering and Natural Sciences Sabanci University Istanbul 34956 Turkey

ISBN: (纸本)0780391993

Breakdown voltage is a unique well-known indicator for gases. Previous work indicate that miniaturized gas ionization sensors, which are made up of two electrodes one of which accommodates vertically aligned carbon nanotubes (CNTs), reduce breakdown voltage thanks to electric field concentration at sharp tips. Modeling of the ionization of the breakdown voltage and optimization of CNTs distribution are reported here. Modeling of CNTs for computational simulations creates a common high aspect-ratio problem due to CNT's microscale length and nanoscale diameter. This problem is solved by comparison of several models and validation of the most reliable one. Three dimensional modeling with periodic boundary conditions is proven quite suitable for actual span of CNTs on a SiO2 substrate. Using the model an optimal distribution of CNTs is obtained. ©2005 IEEE.

关键词： Carbon nanotubes

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Optimal distribution of carbon nanotubes in gas sensor design

Optimal distribution of carbon nanotubes in gas sensor desig...

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IEEE Conference on Nanotechnology

作者： M. Eriten S. Yesilyurt Mechatronics Program Faculty of Engineering and Natural Sciences Sabanci University Istanbul Turkey

Breakdown voltage is a unique well-known indicator for gases. Previous work indicate that miniaturized gas ionization sensors, which are made up of two electrodes one of which accommodates vertically aligned carbon nanotubes (CNTs), reduce breakdown voltage thanks to electric field concentration at sharp tips. Modeling of the ionization of the breakdown voltage and optimization of CNTs distribution are reported here. Modeling of CNTs for computational simulations creates a common high aspect-ratio problem due to CNT's microscale length and nanoscale diameter. This problem is solved by comparison of several models and validation of the most reliable one. Three dimensional modeling with periodic boundary conditions is proven quite suitable for actual span of CNTs on a SiO/sub 2/ substrate. Using the model an optimal distribution of CNTs is obtained.

关键词： Carbon nanotubes Gas detectors Ionization Anodes Electric breakdown Temperature sensors Gases Electrodes Magnetic sensors Magnetic resonance imaging

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