Now showing items 14429-14448 of 22080

    • Opportunistic design margining for area and power efficient processor pipelines in real time applications 

      Jayakrishnan, Mini; Chang, Alan; Kim, Tony Tae-Hyoung (2018)
      The semiconductor industry is strategically focusing on automotive markets, and significant investment is targeted to addressing these markets. Runtime better-than-worst-case designs like Razor lead to massive timing errors ...
    • Opportunities for Fabrication of SOFC Anode Using Selective Laser Melting 

      Tan, Hong Yi Kenneth; Su, Pei-Chen; Sun, Chen-Nan; Wei, Jun (2014)
      Solid oxide fuel cells (SOFC) are electrochemical devices that have the potential to be the future for energy applications. However, current fabrication techniques could not fully optimize the performance of the anode. ...
    • Optic disk localization by a robust fusion method 

      Zhang, Jielin; Yin, Fengshou; Wong, Damon W. K.; Liu, Jiang; Baskaran, Mani; Cheng, Ching Yu; Wong, Tien Yin (2013)
      The optic disk localization plays an important role in developing computer-aided diagnosis (CAD) systems for ocular diseases such as glaucoma, diabetic retinopathy and age-related macula degeneration. In this paper, we ...
    • Optic nerve head and retinal blood flow regulation during isometric exercise as assessed with laser speckle flowgraphy 

      Witkowska, Katarzyna J.; Bata, Ahmed M.; Calzetti, Giacomo; Luft, Nikolaus; Fondi, Klemens; Wozniak, Piotr A.; Schmidl, Doreen; Bolz, Matthias; Popa-Cherecheanu, Alina; Werkmeister, René M.; Garhöfer, Gerhard; Schmetterer, Leopold (2017)
      The aim of the present study was to investigate regulation of blood flow (BF) in the optic nerve head (ONH) and a peripapillary region (PPR) during an isometric exercise-induced increase in ocular perfusion pressure (OPP) ...
    • Optical addressing of nanomechanical metamaterials with subwavelength resolution 

      Ou, Jun-Yu; Plum, Eric; Zheludev, Nikolay I. (2018)
      Metamaterials that offer “on-demand” control of individual metamolecules are termed “randomly accessible metamaterials.” They can be useful for manipulation of the wavefront of electromagnetic radiation, for tailoring of ...
    • Optical alignment of a cylindrical object 

      Song, Chaolong; Nguyen, Nam-Trung; Asundi, Anand Krishna (2009)
      This paper reports the use of theory of geometrical optics to analyze how an optical field interacts with a cylindrical object. Of great interest is the mechanism with which a laser beam with a special profile manipulates ...
    • Optical and electrical applications of ZnSxSe1−x nanowires-network with uniform and controllable stoichiometry 

      Lu, Junpeng; Liu, Hongwei; Sun, Cheng; Zheng, Minrui; Nripan, Mathews; Chen, Gin Seng; Subodh Gautam Mhaisalkar; Zhang, Xinhai; Sow, Chorng Haur (2012)
      Single crystalline ternary ZnSxSe1−x nanowires with uniform chemical stoichiometry and accurately controllable compositions (0≤ x ≤ 1) were synthesized through a simple and yet effective one-step approach with a specially ...
    • Optical and electrical properties of Wurtzite copper indium sulfide nanoflakes 

      Ho, John C. W.; Batabyal, Sudip Kumar; Pramana, Stevin S.; Lum, Jiayi; Pham, Viet T.; Li, Dehui; Xiong, Qihua; Tok, Alfred Iing Yoong; Wong, Lydia Helena (2012)
      Raman spectroscopic analysis and Hall measurement of wurtzite copper indium sulfide (CuInS2) were carried out. Nanocrystalline wurtzite CuInS2 (CIS) was synthesized by a solvothermal reaction route for these studies. It ...
    • Optical and electro-optic anisotropy of epitaxial PZT thin films 

      Zhu, Minmin; Du, Zehui; Jing, Lin; Tok, Alfred Iing Yoong; Teo, Edwin Hang Tong (2015)
      Strong optical and electro-optic (EO) anisotropy has been investigated in ferroelectric Pb(Zr0.48Ti0.52)O3 thin films epitaxially grown on Nb-SrTiO3 (001), (011), and (111) substrates using magnetron sputtering. The ...
    • Optical antenna of comb-shaped split ring architecture for increased field localization in NIR and MIR 

      Kilic, Veli Tayfun; Erturk, Vakur B.; Demir, Hilmi Volkan (2013)
      We propose and demonstrate novel designs of optical antennas based on comb-shaped split ring architecture that display multi resonance field intensity enhancement spectrum. These nanoantennas achieve substantially increased ...
    • Optical bandgap widening and phase transformation of nitrogen doped cupric oxide 

      Masudy-Panah, Saeid; Radhakrishnan, K.; Kumar, Avishek; Wong, Ten It; Yi, Ren; Dalapati, Goutam Kumar (2015)
      The structural and optical properties of sputter deposited nitrogen (N) doped CuO (CuO(N)) thin films are systematically investigated. It is found that the incorporation of N into CuO causes an enlargement of optical bandgap ...
    • Optical bistability in a nonlinear shell coated metallic nanoparticle 

      Chen, Hongli; Zhang, Youming; Zhang, Baile; Gao, Lei (2016)
      We provide a self-consistent mean field approximation in the framework of Mie scattering theory to study the optical bistability of a metallic nanoparticle coated with a nonlinear shell. We demonstrate that the nanoparticle ...
    • Optical bistability in electrically driven polariton condensates 

      Amthor, Matthias; Liew, Timothy Chi Hin; Metzger, C.; Brodbeck, S.; Worschech, L.; Kamp, M.; Shelykh, Ivan; Kavokin, A. V.; Schneider, C.; Höfling, S. (2015)
      We observe a bistability in an electrically driven polariton condensate, which is manifested by a memory dependent threshold characteristic. In contrast to the polariton bistabilities previously observed in resonantly ...
    • Optical bistability in shape-memory nanowire metamaterial array 

      Nagasaki, Yusuke; Gholipour, Behrad; Ou, Jun-Yu; Tsuruta, Masanori; Plum, Eric; MacDonald, Kevin F.; Takahara, Junichi; Zheludev, Nikolay I. (2018)
      Non-volatile temperature-induced structural phase transitions such as those found in chalcogenide glasses are known to lead to strong changes in optical properties and are widely used in rewritable optical disk technology. ...
    • Optical characteristics of p-type GaAs-based semiconductors towards applications in photoemission infrared detectors 

      Lao, Y. F.; Perera, A. G. U.; Wang, H. L.; Zhao, J. H.; Jin, Y. J.; Zhang, Dao Hua (2016)
      Free-carrier effects in a p-type semiconductor including the intra-valence-band and inter-valence-band optical transitions are primarily responsible for its optical characteristics in infrared. Attention has been paid to ...
    • Optical characteristics of 1.55 μm GaInNAs multi-quantum wells 

      Sun, Handong; Clark, Antony H.; Liu, H. Y.; Hopkinson, M.; Calvez, Stephane; Dawson, M. D.; Qiu, Y. N.; Rorison, J. M. (2004)
      We report the optical characterization of high-quality 1.55 mum GaxIn1-xNyAs1-y multiquantum wells (MQWs), grown on GaAs with Ga(In)N0.01As spacer layers. The transitions between the quantized QW states of the electrons ...
    • Optical chirp z-transform processor with a simplified architecture 

      Ngo, Nam Quoc (2014)
      Using a simplified chirp z-transform (CZT) algorithm based on the discrete-time convolution method, this paper presents the synthesis of a simplified architecture of a reconfigurable optical chirp z-transform (OCZT) processor ...
    • Optical control of spin textures in quasi-one-dimensional polariton condensates 

      Antón, C.; Morina, S.; Gao, T.; Eldridge, P. S.; Liew, Timothy Chi Hin; Martín, M. D.; Hatzopoulos, Z.; Savvidis, P. G.; Shelykh, Ivan A.; Viña, L. (2015)
      We investigate spin transport through polarization-resolved spectroscopy by propagating polariton condensates in a quasi-one-dimensional microcavity ridge along macroscopic distances. Under circularly polarized, continuous-wave, ...
    • Optical delay of a signal through a dispersive invisibility cloak 

      Zhang, Baile; Wu, Bae-Ian; Chen, Hongsheng (2009)
      We present a full-wave analysis method on the transmission of a Gaussian light pulse through a spherical invisibility cloak with causal dispersions. The spatial energy distribution of the Gaussian light pulse is distorted ...
    • Optical deposition of nano carbon materials for fiber-based saturable absorbers 

      Yang, Y.; Liu, Huan Huan; Chow, Kin Kee (2012)
      We demonstrated the manipulation of carbon nanotubes (CNTs) and graphene on optical fiber ends for saturable absorbers (SAs) by optical deposition method. The nonlinear absorption of the prepared CNT-based SA is characterized ...