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2004 ASME International Mechanical Engineering Congress and Exposition, IMECE 2004

作者： Pooran, Ryan Al-Fandi, Mohamed Tung, Steve Kotagi, Nalini Kim, Jin-Woo Lee, Ju-Seok Microelectronics - Photonics Program University of Arkansas Department of Mechanical Engineering University of Arkansas Dept. of Biological and Agricultural Engineering University of Arkansas

Microfluidic actuators are extremely important components of microfluidic systems used in biological, chemical and biochemical analyses. We are in the process of developing hybrid microsystem devices that utilize flagellar motors in tethered Escherichia coli (***) cells as actuators. In this study we describe the robustness of the flagellar motor actuators. To examine the robustness of the actuators we observe the behavior of the cells when exposed to a hydrodynamic load. With this method we are able to determine the torque generated by the flagellar motor and the adhesion force of the flagellar filament to the substrate. Using hydrodynamic loading we are also able to synchronize the rotation of multiple cells. Finally, we present data which represents the lifetime of the flagellar motor actuators. Copyright © 2004 by ASME.

关键词： Actuators

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Safety considerations in building ultra-high vacuum plasma enhanced chemical vapor deposition system for low temperature group IV epitaxy

Safety considerations in building ultra-high vacuum plasma e...

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19th Biennial University/Government/Industry Micro-Nano Symposium, UGIM 2012

作者： Naseem, Hameed Yu, Shui-Qing El-Ghazaly, Samir Waqar, Zafar Abu-Safe, Husam Adcock, Shannen Conley, Ben Mosleh, Aboozar Hankton, Bryant Munasinghe, Asanka Department of Electrical Engineering University of Arkansas Fayetteville AR United States Microelectronics-Photonics Program University of Arkansas Fayetteville AR United States

ISBN: (纸本)9781457717499

A state-of-the-art chemical vapor deposition tool has been designed and built at the Photovoltaics Lab, Department of Electrical Engineering in the Engineering Research Center for depositing epitaxial films of group IV elements and their alloys. Due to the use of extremely toxic and flammable/pyrophoric gases safety and process integrity was built into the design right from the get go. College and University safety committees as well as external advisors were used throughout planning and building stages. Standard operating procedures (SOP) and travelers have been developed for various procedures and safety-training documents have been produced for proper training of new students and researchers. This lab is expected to be a model for new equipment building and acquisition at the University. © 2012 IEEE.

关键词： Temperature

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Chaotic behaviors in three-level atomic optical bistability system

Chaotic behaviors in three-level atomic optical bistability ...

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Quantum Electronics and Laser Science Conference, QELS 2005

作者： Yang, Wenge Joshi, Amitabh Xiao, Min Department of Physics University of Arkansas Fayetteville AR 72701 United States Microelectronics-Photonics Program University of Arkansas Fayetteville AR 72701 United States

We experimentally demonstrated chaotic behaviors in three-level Lambda-type atoms inside an optical cavity. The route to chaos through periodic doubling was observed in the experiment, which could be controlled by the... 详细信息

ISBN: (纸本)1557527709

关键词： Optical bistability

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Chaotic behaviors in three-level atomic optical bistability system

Chaotic behaviors in three-level atomic optical bistability ...

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Conference on Lasers and Electro-Optics, CLEO 2006

作者： Yang, Wenge Joshi, Amitabh Xiao, Min Department of Physics University of Arkansas Fayetteville Arkansas 72701 United States Microelectronics-Photonics Program University of Arkansas Fayetteville Arkansas 72701 United States

ISBN: (纸本)1557528136

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Compactly Packaged High-Speed Optical Transceiver Using Silicon photonics ICs on Ceramic Submount

Compactly Packaged High-Speed Optical Transceiver Using Sili...

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IEEE Electronic Components and Technology Conference

作者： Do-Won Kim Andy Lim Eu Jin M. Kumarasamy Raja Vishal Vinayak Kulkarni Leong Ching Wai Jason Liow Tsung Yang Patrick Lo Guo Qiang Nano Photonics Program Institute of Microelectronics (IME) Singapore

High-speed optical module is demonstrated using silicon photonics integrated circuits (Si-PIC) by compact packaging on ceramic submount of which size is 4 mm × 21 mm × 1.1 mm. The electronic integrated circuits (EIC) such as transimpedance amplifier (TIA) for photodetector and driver IC for modulator are flip-chip bonded on the submount using 1 mil diameter of Au stud bumps. The optical transceiver is packaged through the flip-chip bonding of the packaged submount by SAC solders on the evaluation PCB on which RF signal transmission lines are precisely designed. The reliable flip-chip bonding state of the EICs and submount are verified through shear test and X-ray image. Eye diagram is demonstrated at 20 Gbps for receiver module.

关键词： Optical transceiver Silicon photoncis Ceramic submount Compact packaging Flip-chip bonding Stud bumping

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Effect of wave polarization on breast cancer detection

Effect of wave polarization on breast cancer detection

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2007 IEEE Region 5 Technical Conference, TPS

作者： Woten, Douglas A. El-shenawee, Magda Microelectronics-Photonics Program University of Arkansas Fayetteville AK 72701 United States Department of Electrical Engineering University of Arkansas Fayetteville AK 72701 United States

ISBN: (纸本)1424412803

Artificial Neural Networks are explored as a statistical indicator of breast cancer. A simplified model of the breast and tumor is implemented and the scattered electromagnetic fields are used to train and test an Artificial Neural Network. The effects of wave polarization and tumor orientation are explored using a broadband dual-linear antenna. © 2007 IEEE.

关键词： Neural networks

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All inorganic quantum dot light emitting devices with solution processed metal oxide transport layers

All inorganic quantum dot light emitting devices with soluti...

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作者： Vasan, R. Salman, H. Manasreh, M.O. Department of Electrical Engineering University of Arkansas FayettevilleAR72701 United States Microelectronics and Photonics program University of Arkansas FayettevilleAR72701 United States

All inorganic quantum dot light emitting devices with solution processed transport layers are investigated. The device consists of an anode, a hole transport layer, a quantum dot emissive layer, an electron transport layer and a cathode. Indium tin oxide coated glass slides are used as substrates with the indium tin oxide acting as the transparent anode electrode. The transport layers are both inorganic, which are relatively insensitive to moisture and other environmental factors as compared to their organic counterparts. Nickel oxide acts as the hole transport layer, while zinc oxide nanocrystals act as the electron transport layer. The nickel oxide hole transport layer is formed by annealing a spin coated layer of nickel hydroxide sol-gel. On top of the hole transport layer, CdSe/ZnS quantum dots synthesized by hot injection method is spin coated. Finally, zinc oxide nanocrystals, dispersed in methanol, are spin coated over the quantum dot emissive layer as the electron transport layer. The material characterization of different layers is performed by using absorbance, Raman scattering, XRD, and photoluminescence measurements. The completed device performance is evaluated by measuring the IV characteristics, electroluminescence and quantum efficiency measurements. The device turn on is around 4V with a maximum current density of ∼200 mA/cm2 at 9 V. MRS Advances © 2016 Materials Research Society.

关键词： Nickel oxide

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Anomalous, non-Gaussian, viscoelastic, and age-dependent dynamics of histonelike nucleoid-structuring proteins in live Escherichia coli

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Physical Review E 2018年第4期98卷 042411-042411页

作者： Asmaa A. Sadoon Yong Wang Department of Physics Microelectronics-Photonics Graduate Program Cell and Molecular Biology Program University of Arkansas Fayetteville Arkansas 72701 USA

We report our measurements of the dynamics of histonelike nucleoid-structuring (H-NS) proteins, which interact with both proteins and DNA simultaneously, in live Escherichia coli bacteria. The dynamics turn out to differ significantly from other molecules reported previously. A power-law distribution was observed for the diffusion coefficients of individual H-NS proteins. In addition, we observed a distribution of displacements which does not follow the Gaussian, Cauchy, or Laplace distributions but the Pearson Type VII distribution. Furthermore, we experimentally measured the time and frequency dependence of the complex modulus of the bacterial cytoplasm, which deviates from the viscoelasticity of homogeneous protein solutions and shows a glass-liquid transition. Last, we observed that the dynamics of H-NS proteins is cell length and cell age dependent. The findings are expected to fundamentally change the current views on bacterial cytoplasm and diffusional dynamics of molecules in bacteria.

关键词： Anomalous diffusion Viscoelasticity

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Fabrication of an Electrochemical Sensor for Glucose Detection using ZnO Nanorods

Fabrication of an Electrochemical Sensor for Glucose Detecti...

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作者： Mandal, Sanghamitra Marie, Mohammed Manasreh, Omar Department of Electrical Engineering University of Arkansas FayettevilleAR72701 United States Microelectronics Photonics Program University of Arkansas FayettevilleAR72701 United States

An electrochemical glucose sensor based on zinc oxide (ZnO) nanorods is fabricated, characterized and tested. The ZnO nanorods are synthesized on indium titanium oxide (ITO) coated glass substrate, using the hydrothermal sol-gel technique. The working principle of the sensor under investigation is based on the electrochemical reaction taking place between cathode and anode, in the presence of an electrolyte. A platinum plate, used as the cathode and Nafion/Glucose Oxidase/ZnO nanorods/ITO-coated glass substrate used as anode, is immersed in pH 7.0 phosphate buffer solution electrolyte to test for the presence of glucose. Several amperometric tests are performed on the fabricated sensor to determine the response time, sensitivity and limit of detection of the sensor. A fast response time less than 3 s with a high sensitivity of 1.151 mA cm-2mM-1 and low limit of detection of 0.089 mM is reported. The glucose sensor is characterized using the cyclic voltammetry method in the range from -0.8 - 0.8 V with a voltage scan rate of 100 mV/s. © Copyright Materials Research Society 2016.

关键词： Electrolytes

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Mechanical-energy-based amplifiers for probing interactions of DNA with metal ions

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Physical Review E 2018年第6期98卷 062403-062403页

作者： Jack Freeland Prabhat Khadka Yong Wang Department of Physics Microelectronics-Photonics Graduate Program Cell and Molecular Biology Program University of Arkansas Fayetteville Arkansas 72701 USA

We report our development of a simple and cost-effective method to amplify and probe the interactions of DNA with metal ions, which are important for various fundamental processes in living systems. This method is based on perturbing energy landscapes using mechanical energy stored in bent DNA molecules. In this proof-of-principle study, the mechanical-energy-based amplifiers were applied to examine the interactions between DNA and Mg2+ ions or Ag+ ions. We demonstrated that interactions between DNA and Mg2+ or Ag+ ions, which are not detectable using gel electrophoresis without amplification, can be easily measured using our molecular amplifiers. In addition, we showed that quantitative details about the DNA-metal interactions can be estimated using our method. Our method is simple, sensitive, and cost-effective. We expect that the developed method will be useful for various applications.

关键词： Biomechanics DNA

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