Now showing items 3669-3688 of 3906

    • A Tunable Optical Bragg Grating Filter Based on the Droplet Sagging Effect on a Superhydrophobic Nanopillar Array 

      Zhang, Meng; Liu, Jiansheng; Cheng, Weifeng; Cheng, Jiangtao; Zheng, Zheng (MDPI, 2019-07-29)
      Nanostructures have been widely applied on superhydrophobic surfaces for controlling the wetting states of liquid microdroplets. Many modern optic devices including sensors are also integrated with micro- or nanostructures ...
    • Tunable self-biased magnetoelectric response in homogenous laminates 

      Zhou, Y.; Yang, S. C.; Apo, D. J.; Maurya, Deepam; Priya, Shashank (AIP Publishing, 2012-12-01)
      In this study, we demonstrate self-biased magnetoelectric effect in homogenous two-phase magnetostrictive-piezoelectric laminates. Our results illustrate the method for tuning the magnitude of self-bias effect and provide ...
    • Tuning Complex Systems by Sonifying Their Performance Data 

      Henthorne, Cody; Bukvic, Ivica Ico; Pyla, Pardha S.; Tilevich, Eli (Department of Computer Science, Virginia Polytechnic Institute & State University, 2013), TR-13-01
      In the modern computing landscape, the challenge of tuning software systems is exacerbated by the necessity to accommodate multiple divergent execution environments and stakeholders. Achieving optimal performance requires ...
    • Tunneling-injection of electrons and holes into quantum dots: A tool for high-power lasing 

      Han, D. S.; Asryan, Levon V. (AIP Publishing, 2008-06-01)
      We study the optical output power of a semiconductor laser, which exploits tunneling-injection of electrons and holes into quantum dots (QDs) from two separate quantum wells. Even if there is out-tunneling leakage of ...
    • Turbine Blade Tip External Cooling Technologies 

      Xue, Song; Ng, Wing Fai (MDPI, 2018-08-26)
      This article provides an overview of gas turbine blade tip external cooling technologies. It is not the intention to comprehensively review all the publications from past to present. Instead, selected reports, which represent ...
    • Turbulence Measurements in Trailing Vortices for B.W.I. Noise Prediction 

      Devenport, William J.; Glegg, Stewart A. L.; Sharma, Gautam (Virginia Polytechnic Institute and State University, 1992-06-01)
      Blade wake interaction (BWI) noise is the broadband noise generated by the ingestion of turbulent tip vortices into helicopter rotors. Prediction of BWI noise requires knowledge of the turbulence structure of the tip vortex. ...
    • Turing's Test and Conscious Thought 

      Michie, Donald (Department of Computer Science, Virginia Polytechnic Institute & State University, 1992), TR-92-04
      Over 40 years ago, A. M. Turing proposed a test for intelligence in machines. Based as it is, solely on an examinee's verbal responses, the Test misses some important components of human thinking. To bring these manifestations ...
    • A Tutorial View Of Simulation Model Development 

      Nance, Richard E. (Department of Computer Science, Virginia Polytechnic Institute & State University, 1983), CS83025-R
      Working from the background of simulation language developments, we develop an understanding of the current status of simulation model development. Factors characterizing the current status include a shift in emphasis from ...
    • Twenty Five Years of Fortran: A National Acm Lectureship Series Presentation 

      Lee, John A. N. (Department of Computer Science, Virginia Polytechnic Institute & State University, 1982), CS82010-R
      In 1982 FORTRAN will have existed in the environment of computers, computing and computation for 25 years, making it one of the most successful of programming languages even if it is not the actual oldest still surviving ...
    • Twitter Use During an Emergency Event: The Case of UT Austin Shooting 

      Li, Lin T.; Yang, Seungwon; Kavanaugh, Andrea L.; Fox, Edward A.; Sheetz, Steven D.; Shoemaker, Donald J. (2011-06-01)
      This poster presents one of our efforts developed in the context of Crisis, Tragedy, and Recovery Network (CTRnet) project. One of our derived works from this project is the use of social media by government to respond to ...
    • Two Approaches to Enhance the Education for ETDs: Developing Educational Modules and Migrating the ETD Guide into a Community Wiki 

      Yang, Seungwon; Levy, Jean; Miller, Kevin; Pomerantz, Jeffrey P.; Oh, Sanghee; Wildemuth, Barbara M.; Fox, Edward A. (2008-05-19)
      Two efforts have been made by the Digital Library (DL) Curriculum Development Project Group (http://curric.dlib.vt.edu) to help the ETD community. Our first activity is the preparation of multiple educational modules, which ...
    • Two Point Constraint Approximation in Structural Optimization 

      Haftka, Raphael T.; Nachlas, Joel A.; Watson, Layne T.; Rizzo, Thomas; Desai, Rajendra (Department of Computer Science, Virginia Polytechnic Institute & State University, 1986), TR-86-21
      The use of constraint approximations is recognized as a primary means of achieving computational efficiency in structural optimization. Existing approximation methods are based upon the value of the constraint function and ...
    • Two-Dimensional Textural Edge Detection Using Ω-Gaussian Filter 

      Park, Jinwoo; Poon, Ting-Chung; Indebetouw, Gary (Optical Society of America, 1986-11-01)
      A textural edge detection frequency domain filter is proposed to locate the boundary between two textural domains modulated by different spatial frequencies. This filter is derived from a zero-order prolate spheroidal ...
    • Two-dimensional transition metal carbides as supports for tuning the chemistry of catalytic nanoparticles 

      Li, Zhe; Yu, Liang; Milligan, Cory; Ma, Tao; Zhou, Lin; Cui, Yanran; Qi, Zhiyuan; Libretto, Nicole; Xu, Biao; Luo, Junwei; Shi, Enzheng; Wu, Zhenwei; Xin, Hongliang; Delgass, W. Nicholas; Miller, Jeffrey T.; Wu, Yue (2018-12-10)
      Supported nanoparticles are broadly employed in industrial catalytic processes, where the active sites can be tuned by metal-support interactions (MSIs). Although it is well accepted that supports can modify the chemistry ...
    • Two-phase Monte Carlo simulation for partitioning the effects of epistemic and aleatory uncertainty in TMDL modeling 

      Mishra, Anurag; Ahmadisharaf, Ebrahim; Benham, Brian L.; Gallagher, Daniel L.; Reckhow, Kenneth H.; Smith, Eric P. (American Society of Civil Engineers (ASCE), 2018-10-29)
      A two-phase Monte Carlo simulation (TPMCS) uncertainty analysis framework is used to analyze epistemic and aleatory uncertainty associated with simulated exceedances of an in-stream fecal coliform (FC) water quality criterion ...
    • Two-phonon coupling to the antiferromagnetic phase transition in multiferroic BiFeO(3) 

      Ramirez, M. O.; Krishnamurthi, M.; Denev, S.; Kumar, Amit; Yang, S. Y.; Chu, Y. H.; Saiz, E.; Seidel, J.; Pyatakov, Alexander P.; Bush, A.; Viehland, Dwight D.; Orenstein, J.; Ramesh, R.; Gopalan, V. (AIP Publishing, 2008-01-01)
      A prominent band centered at similar to 1000-1300 cm(-1) and associated with resonant enhancement of two-phonon Raman scattering is reported in multiferroic BiFeO(3) thin films and single crystals. A strong anomaly in this ...
    • A Two-Stage Approach for Improving the Convergence of Least-Mean-Square Adaptive Decision-Feedback Equalizers in the Presence of Severe Narrowband Interference 

      Batra, Arun; Zeidler, James R.; Beex, A. A. Louis (2007-08-16)
      It has previously been shown that a least-mean-square (LMS) decision-feedback filter can mitigate the effect of narrowband interference (L.-M. Li and L. Milstein, 1983). An adaptive implementation of the filter was shown ...
    • Two-stage multichannel LED driver with CLL resonant circuit 

      Electrical and Computer Engineering; Center for Power Electronics Systems (CPES); Virginia Tech Intellectual Properties, Inc.; Li, Qiang; Lee, Fred C.; Chen, Xuebing; Huang, Daocheng (United States Patent and Trademark Office, 2017-01-10)
      In a two-stage power converter providing voltage regulation in a first stage, zero voltage switching (ZVS) is provided in switches in an unregulated, constant frequency second stage of a two-stage power converter by an ...
    • The UAN: A User-Oriented Representation for Direct ManipulationInterface Designs 

      Hartson, H. Rex; Siochi, Antonio C.; Hix, Deborah (Department of Computer Science, Virginia Polytechnic Institute & State University, 1990), TR-90-16
      Almost all existing interface representation techniques, especially those associated with UIMS, are constructional, focused on interface implementation, and therefore do not adequately support a user-centered focus. But ...
    • UIMS: Toward the Next Generation 

      Hartson, H. Rex; Hix, Deborah (Department of Computer Science, Virginia Polytechnic Institute & State University, 1986), TR-86-41
      First generation User Interface Management Systems (UIMS) have established themselves in both research and commercial areas. This paper discusses improved usability and extension of UIMS to include a broader whole system ...