Now showing items 428-447 of 518

    • Satellite Formation Flight Simulation Using Multi-Constellation GNSS and Applications to Ionospheric Remote Sensing 

      Peng, YuXiang; Scales, Wayne A. (MDPI, 2019-11-30)
      The Virginia Tech Formation Flying Testbed (VTFFTB) is a global navigation satellite system (GNSS)-based hardware-in-the-loop (HIL) simulation testbed for spacecraft formation flying with ionospheric remote sensing ...
    • Scalable Fabrication of Highly Flexible Porous Polymer-Based Capacitive Humidity Sensor Using Convergence Fiber Drawing 

      Tousi, Maryam Mesgarpour; Zhang, Yujing; Wan, Shaowei; Yu, Li; Hou, Chong; Yan, Ning; Fink, Yoel; Wang, Anbo; Jia, Xiaoting (MDPI, 2019-12-02)
      In this study, we fabricated a highly flexible fiber-based capacitive humidity sensor using a scalable convergence fiber drawing approach. The sensor’s sensing layer is made of porous polyetherimide (PEI) with its ...
    • Scalable nanolaminated SERS multiwell cell culture assay 

      Ren, Xiang; Nam, Wonil; Ghassemi, Parham; Strobl, Jeannine S.; Kim, Inyoung; Zhou, Wei; Agah, Masoud (Springer Nature, 2020)
      This paper presents a new cell culture platform enabling label-free surface-enhanced Raman spectroscopy (SERS) analysis of biological samples. The platform integrates a multilayered metal-insulator-metal nanolaminated SERS ...
    • Sectioning with edge extraction in optical incoherent imaging processing 

      Zhang, Yaping; Wang, Rende; Tsang, Peter; Poon, Ting-Chung (2020-04-15)
      Employing a single-pixel digital holographic recording technique called optical scanning holography (OSH), we accomplish the formidable task of sectioning with edge extraction in three-dimensional (3D) optical incoherent ...
    • Security and Privacy produced by nHCP Unique Identifiers 

      Tront, Joseph G.; Groat, Stephen; Dunlop, Matthew; Marchany, Randolph C. (IEEE, 2011-10)
      As protection against the current privacy weaknesses of StateLess Address AutoConfiguration (SLAAC) in the Internet Protocol version 6 (IPv6), network administrators may choose to deploy the new Dynamic Host Configuration ...
    • Semiconductor module arrangement 

      Electrical and Computer Engineering; Center for Power Electronics Systems (CPES); Virginia Tech Intellectual Properties, Inc.; DiMarino, Christina; Boroyevich, Dushan; Burgos, Rolando P.; Johnson, Mark (United States Patent and Trademark Office, 2018-07-24)
      In a switching module structure that includes a low-impedance path to ground, such as a parasitic capacitance of an insulating substrate, a further insulating substrate presenting a parasitic capacitance placed in series ...
    • Sensing and Autonomy for Riverine Vessels 

      Stilwell, Daniel J.; Woolsey, Craig A. (Defense Technical Information Center, 2012)
      The principal goal of this project is to develop the technology and algorithms that will enable an unmanned surface vehicle (USV) to operate fast and autonomously in unknown riverine environments, including tropical rivers. ...
    • Separation of Intrinsic and extrinsic Optical-Absorption in a Fluoride Glass 

      Jewell, J. M.; Williams, G. M.; Jaganathan, J.; Aggarwal, I. D.; Greason, P. (AIP Publishing, 1991-07-01)
      The contribution of impurity ions to the total optical absorption of a heavy metal fluoride glass has been determined at 532 and 1064 nm. Four ZrF4-BaF2-LaF3-AlF3-NaF glasses were prepared from various purity raw materials. ...
    • Shield synthesis 

      Koenighofer, Bettina; Alshiekh, Mohammed; Bloem, Roderick; Humphrey, Laura; Koenighofer, Robert; Topcu, Ufuk; Wang, Chao (2017-11)
      Shield synthesis is an approach to enforce safety properties at runtime. A shield monitors the system and corrects any erroneous output values instantaneously. The shield deviates from the given outputs as little as it can ...
    • SIMAT: GC-SIM-MS data analysis tool 

      Nezami Ranjbar, Mohammad R.; Poto, Cristina D.; Wang, Yue; Ressom, Habtom W. (2015-08-19)
      Background Gas chromatography coupled with mass spectrometry (GC-MS) is one of the technologies widely used for qualitative and quantitative analysis of small molecules. In particular, GC coupled to single quadrupole MS ...
    • Single-thermal-source formation of Zn x Cd1-x S thin films 

      Burton, Larry C.; Hench, T. L.; Meakin, J. D. (American Institute of Physics, 1979)
      Thermal sublimation of atomically homogeneous Zn x Cd1_x S powders from a single source results in films that are nonuniform in a direction normal to the substrate. This is attributed to initial preferential sublimation ...
    • Solving inverse problems for optical scanning holography using an adaptively iterative shrinkage-thresholding algorithm 

      Zhao, F. J.; Qu, X. C.; Zhang, Xin; Poon, Ting-Chung; Kim, Taegeun; Kim, Y. S.; Liang, J. M. (Optical Society of America, 2012-03-01)
      Optical scanning holography (OSH) records a three-dimensional object into a two-dimensional hologram through two-dimensional optical scanning. The recovery of sectional images from the hologram, termed as an inverse problem, ...
    • Spark on the ARC - Big data analytics frameworks on HPC clusters 

      DeYoung, Mark E.; Salman, Mohammed; Bedi, Himanshu; Raymond, David Richard; Tront, Joseph G. (ACM, 2017-07)
      In this paper we document our approach to overcoming service discovery and configuration of Apache Hadoop and Spark frameworks with dynamic resource allocations in a batch oriented Advanced Research Computing (ARC) High ...
    • Sparse-Prior-Based Projection Distance Optimization Method for Joint CT-MRI Reconstruction 

      Cui, Xuelin; Mill, Lamine; Yu, Hengyong (IEEE, 2017)
      Multimodal imaging techniques have received a great deal of attention, since their inceptions for achieving an enhanced imaging performance. In this paper, a novel joint reconstruction framework for computed tomography ...
    • Speckle-free digital holographic recording of a diffusely reflecting object 

      Kim, Y. S.; Kim, Taegeun; Woo, S. S.; Kang, H.; Poon, Ting-Chung; Zhou, Changhe (Optical Society of America, 2013-04-01)
      We demonstrate holographic recording without speckle noise using the digital holographic technique called optical scanning holography (OSH). First, we record a complex hologram of a diffusely reflecting (DR) object using ...
    • Spherical cap harmonic analysis of Super Dual Auroral Radar Network (SuperDARN) observations for generating maps of ionospheric convection 

      Fiori, R. A. D.; Boteler, D. H.; Koustov, A. V.; Haines, G. V.; Ruohoniemi, J. Michael (American Geophysical Union, 2010-07-01)
      A spherical cap harmonic analysis (SCHA) technique is introduced for mapping the 2-D high-latitude ionospheric convection pattern based on Super Dual Auroral Radar Network (SuperDARN) velocity measurements. The current ...
    • Split-spectrum self-referenced fiber optic sensor 

      Electrical and Computer Engineering; Center for Innovative Technology; Virginia Polytechnic Institute and State University; Virginia Tech Intellectual Properties, Inc.; Murphy, Kent A.; Claus, Richard O.; Wang, Anbo (United States Patent and Trademark Office, 1995-08-29)
      A fiber optic sensor is fully compensated for light source intensity variation, fiber losses and modal power distribution by providing input to one end of an optical fiber from a relatively broad band light source containing ...
    • Static-Aligned Piezoelectric Poly (Vinylidene Fluoride) Electrospun Nanofibers/MWCNT Composite Membrane: Facile Method 

      Shehata, Nader; Elnabawy, Eman; Abdelkader, Mohamed; Hassanin, Ahmed H.; Salah, Mohamed; Nair, Remya; Ahmad Bhat, Sameer (MDPI, 2018-09-01)
      Polyvinylidene Fluoride (PVDF) piezoelectric electrospun nanofibers have been intensively used for sensing and actuation applications in the last decade. However, in most cases, random PVDF piezoelectric nanofiber mats ...
    • Stimulated Brillouin scattering during electron gyro-harmonic heating at EISCAT 

      Fu, H. Y.; Scales, W. A.; Bernhardt, P. A.; Briczinski, S. J.; Kosch, M. J.; Senior, A.; Rietveld, M. T.; Yeoman, T. K.; Ruohoniemi, J. M. (European Geosciences Union, 2015)
      Observations of secondary radiation, stimulated electromagnetic emission (SEE), produced during ionospheric modification experiments using ground-based, highpower, high-frequency (HF) radio waves are considered. The High ...
    • A Stochastic Geometric Analysis of Device-to-Device Communications Operating Over Generalized Fading Channels 

      Chun, Young Jin; Cotton, Simon L.; Dhillon, Harpreet S.; Ghrayeb, Ali; Hasna, Mazen O. (2017-07)
      Device-to-device (D2D) communications are now considered an integral part of future 5G networks, which will enable direct communication between user equipments and achieve higher throughputs than conventional cellular ...