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作者： Inceoglu, Funda Dalgicdir, Cahit Menceloglu, Yusuf Z. Faculty of Engineering and Natural Sciences Material Science and Engineering Program Sabanci University 34956 Orhanli Tuzla Istanbul Turkey

ISBN: (纸本)9780841274488

The combination of UV-curing and nanocomposite technology has been studied to produce cost-effective coatings with superior physical and mechanical properties. The clay was modified with dimethyl dihydrogenated-tallow quaternary ammonium salt and made organophilic. The effect of the organoclay(2-10 phr) on curing rate, mechanical, thermal and physical properties of a urethane-acrylate coating has been determined. X-ray diffraction analysis, AFM, SEM and TEM images as well as the tensile properties of different formulations have confirmed the uniform distribution of organoclay in polymer matrix. At 3 phr organoclay addition, the UV-cured film exhibited the best mechanical performance due to the formation of both intercalated and exfoliated morphologies. Curing time was reduced and the initial thermal decomposition temperature shifted 50°C to higher temperature by the incorporation of small amount of organoclay. The nanocomposite coating was also found to be more resistant against scratching compared with clay-free coating. © 2009 American Chemical Society.

关键词： Cost effectiveness

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Hybrid vision/force feedback control for pushing micro-objects

Hybrid vision/force feedback control for pushing micro-objec...

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2009 IEEE/RSJ International Conference on Intelligent Robots and Systems

作者： Shahzad Khan Asif Sabanovic Mechatronics System Design Faculty of 3mE Delft University of Technnology Netherlands Mechatronics Programme Faculty of Engineering and Natural Sciences Sabanci University Turkey

In 2D microassembly applications, it is inevitable to position and orient polygonal micro-objects lying on a flat surface. Point contact pushing of micro-objects provides a feasible way to achieve the task and it is more flexible and less complex compared to pick and place operation. Due to the fact that in micro-world surface forces are much more dominant than inertial forces, and tend to be unevenly distributed, these dominant forces obstruct the desired motion of the micro-object when using point contact pushing alone. Thus by adopting an hybrid vision/force feedback scheme, it is possible to attain a translation motion of the object as the uncertainties due to varying surface forces and disorientation of the micro-object is compensated by force and vision feedback respectively. In this paper, a hybrid vision/force feedback scheme is proposed to push micro-objects with human assistance using a custom built tele-micromanipulation setup to achieve translational motion. The pushing operation is divided into two concurrent processes: In one human operator acts as an impedance controller alters the velocity of the pusher while in contact with the micro-object through scaled bilateral teleoperation to compensate for varying surface forces. In the other process, the desired line of pushing for the micro-object is determined continuously using visual feedback procedures so that it always compensate for the disorientation. Experimental results are demonstrated to prove nano-Newton range force sensing, scaled bilateral teleoperation with force feedback and pushing micro-objects.

关键词： Force feedback Force control Motion control Control systems Humans mechatronics Design engineering Uncertainty Intelligent robots USA Councils

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Semi-autonomous scheme for pushing micro-objects

Semi-autonomous scheme for pushing micro-objects

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IEEE International Conference on Industrial Technology (ICIT)

作者： Shahzad Khan Asif Sabanovic Mechatronics System Design Department of Precision and Microsystems Engineering Faculty of 3mE Delft University of Technnology Netherlands Mechatronics Programme Faculty of Engineering and Natural Sciences Sabanci University Turkey

ISBN: (纸本)9781424435067

In many microassembly applications, it is often desirable to position and orient polygonal micro-objects lying on a planar surface. Pushing micro-objects using point contact provides more flexibility and less complexity compared to pick and place operation. Due to the fact that in micro-world surface forces are much more dominant than inertial forces and these forces are distributed unevenly, pushing through the center of mass of the micro-object will not yield a pure translational motion. In order to translate a micro-object, the line of pushing should pass through the center of friction. In this paper, a semi-autonomous scheme based on hybrid vision/force feedback is proposed to push microobjects with human assistance using a custom built tele-micromanipulation setup to achieve pure translational motion. The pushing operation is divided into two concurrent processes: In one process human operator who acts as an impedance controller alters the velocity of the pusher while in contact with the micro-object through scaled bilateral teleoperation with force feedback. In the other process, the desired line of pushing for the micro-object is determined continuously using visual feedback procedures so that it always passes through the varying center of friction. Experimental results are demonstrated to prove nano-Newton range force sensing, scaled bilateral teleoperation with force feedback and pushing microobjects.

关键词： Communication system control Master-slave Control systems Delay effects Sampling methods Bandwidth Force control Design engineering Systems engineering and theory Motor drives

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Techniques to study autophagy in plants

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International Journal of Plant Genomics 2009年第unknown期2009卷 451357页

作者： Gozuacik, Devrim Mitou, Géraldine Budak, Hikmet Biological Science and Bioengineering Program Sabanci University Orhanli Faculty of Engineering and Natural Sciences Tuzla 34956 Istanbul Turkey

Autophagy (or self eating), a cellular recycling mechanism, became the center of interest and subject of intensive research in recent years. Development of new molecular techniques allowed the study of this biological phenomenon in various model organisms ranging from yeast to plants and mammals. Accumulating data provide evidence that autophagy is involved in a spectrum of biological mechanisms including plant growth, development, response to stress, and defense against pathogens. In this review, we briefly summarize general and plant-related autophagy studies, and explain techniques commonly used to study autophagy. We also try to extrapolate how autophagy techniques used in other organisms may be adapted to plant studies. © 2009 Géraldine Mitou et al.

关键词： Yeast Autophagy Biological Phenomena Technology

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Wet Lab Tools Widely Used in Plant Genomics

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International Journal of Plant Genomics 2010年第1期2009卷

作者： Hikmet Budak Hongbin Zhang Pushpendra K. Gupta Boulos Chalhoub Andrew James Chunji Liu Biological Sciences and Bioengineering Program Faculty of Engineering and Natural Sciences Sabanci University 34956 Tuzla Istanbul Turkeysabanciuniv.edu.tr Department of Soil and Crop Sciences Texas A&M University College Station TX USAtamu.edu Ch. Charan Singh University Indiaccsuniversity.ac.in Institut National de la Recherche Agronomique Franceinra.fr Centro de Investigacion Cientifica de Yucatan Mexicocicy.mx Commonwealth Scientific and Research Organization Australiacsiro.au

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Virus-induced gene silencing, A post transcriptional gene silencing method

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International Journal of Plant Genomics 2009年第1期2009卷 198680页

作者： Unver, Turgay Budak, Hikmet Biological Sciences and Bioengineering Program Faculty of Engineering and Natural Sciences Sabanci University Orhanli Tuzla Turkey Kocaeli University Arslanbey MYO Izmit Turkey

Virus-induced gene silencing (VIGS) is one of the reverse genetics tools for analysis of gene function that uses viral vectors carrying a target gene fragment to produce dsRNA which trigger RNA-mediated gene silencing. There are a number of viruses which have been modified to silence the gene of interest effectively with a sequence-specific manner. Therefore, different types of methodologies have been advanced and modified for VIGS approach. Virus-derived inoculations are performed on host plants using different methods such as agro-infiltration and in vitro transcriptions. VIGS has many advantages compared to other loss-of-gene function approaches. The approach provides the generation of rapid phenotype and no need for plant transformation. The cost of VIGS experiment is relatively low, and large-scale analysis of screening studies can be achieved by the VIGS. However, there are still limitations of VIGS to be overcome. Nowadays, many virus-derived vectors are optimized to silence more than one host plant such as TRV-derived viral vectors which are used for Arabidopsis and Nicothiana benthamiana. By development of viral silencing systems monocot plants can also be targeted as silencing host in addition to dicotyledonous plants. For instance, Barley stripe mosaic virus (BSMV)-mediated VIGS allows silencing of barley and wheat genes. Here we summarize current protocols and recent modified viral systems to lead silencing of genes in different host species. Copyright © 2009 T. Unver and H. Budak.

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Review of current methodological approaches for characterizing MicroRNAs in plants

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International Journal of Plant Genomics 2009年第1期2009卷 262463页

作者： Unver, Turgay Namuth-Covert, Deana M. Budak, Hikmet Biological Sciences and Bioengineering Program Faculty of Engineering and Natural Sciences Sabanci University Orhanli Tuzla 34956 Istanbul Turkey Department of Agronomy and Horticulture University of Nebraska-Lincoln Lincoln NE United States

Advances in molecular biology have led to some surprising discoveries. One of these includes the complexities of RNA and its role in gene expression. One particular class of RNA called microRNA (miRNA) is the focus of this paper. We will first briefly look at some of the characteristics and biogenesis of miRNA in plant systems. The remainder of the paper will go into details of three different approaches used to identify and study miRNA. These include two reverse genetics approaches: computation (bioinformatics) and experimental, and one rare forward genetics approach. We also will summarize how to measure and quantify miRNAs, and how to detect their possible targets in plants. Strengths and weaknesses of each methodological approach are discussed. © 2009 Turgay Unver et al.

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Optimal dimensional synthesis of force feedback lower arm exoskeletons

Optimal dimensional synthesis of force feedback lower arm ex...

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IEEE/RAS-EMBS International Conference on Biomedical Robotics and Biomechatronics (BioRob)

作者： Ramazan Unal Volkan Patoglu Faculty of Engineering and Natural Sciences Mechatronics Program Sabanci University Istanbul Turkey

This paper presents multi-criteria design optimization of parallel mechanism based force feedback exoskeletons for human forearm and wrist. The optimized devices are aimed to be employed as a high fidelity haptic interfaces. Multiple design objectives are discussed and classified for the devices and the optimization problem to study the trade-offs between these criteria is formulated. Dimensional syntheses are performed for optimal global kinematic and dynamic performance, utilizing a Pareto front based framework, for two spherical parallel mechanisms that satisfy the ergonomic necessities of a human forearm and wrist. Two optimized mechanisms are compared and discussed in the light of multiple design criteria. Finally, kinematic structure and dimensions of an optimal exoskeleton are decided.

关键词： Force feedback Exoskeletons Design optimization Haptic interfaces Humans Kinematics Wrist Force sensors Parallel robots Ergonomics

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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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2007 Mediterranean Conference on Control and Automation, MED

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

ISBN: (纸本)142441282X

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. ©2007 IEEE.

关键词： Piezoelectric actuators

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Brachypodium genomics

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International Journal of Plant Genomics 2008年第1期2008卷 536104页

作者： Ozdemir, Bahar Sogutmaz Hernandez, Pilar Filiz, Ertugrul Budak, Hikmet Biological Science and Bioengineering Program Faculty of Engineering and Natural Sciences Sabanci University Orhanli 34956 Tuzla-Istanbul Turkey Institute for Sustainable Agriculture (IAS) Spanish National Research Council (CSIC) 14080 Cordoba Alameda del Obispo s/n Apartado 4084 Spain

Brachypodium distachyon (L.) Beauv. is a temperate wild grass species;its morphological and genomic characteristics make it a model system when compared to many other grass species. It has a small genome, short growth cycle, self-fertility, many diploid accessions, and simple growth requirements. In addition, it is phylogenetically close to economically important crops, like wheat and barley, and several potential biofuel grasses. It exhibits agricultural traits similar to those of these target crops. For cereal genomes, it is a better model than Arabidopsis thaliana and Oryza sativa (rice), the former used as a model for all flowering plants and the latter hitherto used as model for genomes of all temperate grass species including major cereals like barley and wheat. Increasing interest in this species has resulted in the development of a series of genomics resources, including nuclear sequences and BAC/EST libraries, together with the collection and characterization of other genetic resources. It is expected that the use of this model will allow rapid advances in generation of genomics information for the improvement of all temperate crops, particularly the cereals.

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