Now showing items 1-20 of 1897

    • Feedforward Inhibition Conveys Time-Varying Stimulus Information in a Collision Detection Circuit 

      Wang, Hongxia; Dewell, Richard B.; Zhu, Ying; Gabbiani, Fabrizio (2018)
      Feedforward inhibition is ubiquitous as a motif in the organization of neuronal circuits. During sensory information processing, it is traditionally thought to sharpen the responses and temporal tuning of feedforward ...
    • Rapid Calculation of Molecular Kinetics Using Compressed Sensing 

      Litzinger, Florian; Boninsegna, Lorenzo; Wu, Hao; Nüske, Feliks; Patel, Raajen; Baraniuk, Richard; Noé, Frank; Clementi, Cecilia (2018)
      Recent methods for the analysis of molecular kinetics from massive molecular dynamics (MD) data rely on the solution of very large eigenvalue problems. Here we build upon recent results from the field of compressed sensing ...
    • Exploratory study of atmospheric methane enhancements derived from natural gas use in the Houston urban area 

      Sanchez, Nancy P.; Zheng, Chuantao; Ye, Weilin; Czader, Beata; Cohan, Daniel S.; Tittel, Frank K.; Griffin, Robert J. (2018)
      The extensive use of natural gas (NG) in urban areas for heating and cooking and as a vehicular fuel is associated with potentially significant emissions of methane (CH4) to the atmosphere. Methane, a potent greenhouse ...
    • Continuous transition between weak and ultrastrong coupling through exceptional points in carbon nanotube microcavity exciton–polaritons 

      Gao, Weilu; Li, Xinwei; Bamba, Motoaki; Kono, Junichiro (2018)
      Non-perturbative coupling of photons and excitons produces hybrid particles, exciton–polaritons, which have exhibited a variety of many-body phenomena in various microcavity systems. However, the vacuum Rabi splitting ...
    • Vacuum Bloch–Siegert shift in Landau polaritons with ultra-high cooperativity 

      Li, Xinwei; Bamba, Motoaki; Zhang, Qi; Fallahi, Saeed; Gardner, Geoff C.; Gao, Weilu; Lou, Minhan; Yoshioka, Katsumasa; Manfra, Michael J.; Kono, Junichiro (2018)
      A two-level system resonantly interacting with an a.c. magnetic or electric field constitutes the physical basis of diverse phenomena and technologies. However, Schrödinger’s equation for this seemingly simple system can ...
    • Model reduction by iterative error system approximation 

      Antoulas, A.C.; Benner, Peter; Feng, Lihong (2018)
      The analysis of a posteriori error estimates used in reduced basis methods leads to a model reduction scheme for linear time-invariant systems involving the iterative approximation of the associated error systems. The ...
    • High-Power DFB Diode Laser-Based CO-QEPAS Sensor: Optimization and Performance 

      Ma, Yufei; Tong, Yao; He, Ying; Yu, Xin; Tittel, Frank K. (2018)
      A highly sensitive carbon monoxide (CO) trace gas sensor based on quartz-enhanced photoacoustic spectroscopy (QEPAS) was demonstrated. A high-power distributed feedback (DFB), continuous wave (CW) 2.33 μm diode laser with ...
    • Ppbv-Level Ethane Detection Using Quartz-Enhanced Photoacoustic Spectroscopy with a Continuous-Wave, Room Temperature Interband Cascade Laser 

      Li, Chunguang; Dong, Lei; Zheng, Chuantao; Lin, Jun; Wang, Yiding; Tittel, Frank K. (2018)
      A ppbv-level quartz-enhanced photoacoustic spectroscopy (QEPAS)-based ethane (C2H6) sensor was demonstrated by using a 3.3 μm continuous-wave (CW), distributed feedback (DFB) interband cascade laser (ICL). The ICL was ...
    • Snapshot Hyperspectral Imaging (SHI) for Revealing Irreversible and Heterogeneous Plasmonic Processes 

      Kirchner, Silke R.; Smith, Kyle W.; Hoener, Benjamin S.; Collins, Sean S.E.; Wang, Wenxiao; Cai, Yi-Yu; Kinnear, Calum; Zhang, Heyou; Chang, Wei-Shun; Mulvaney, Paul; Landes, Christy F.; Link, Stephan (2018)
      Plasmon-mediated processes provide unique opportunities for selective photocatalysis, photovoltaics, and electrochemistry. Determining the influence of particle heterogeneity is an unsolved problem because often such ...
    • Intersubband plasmons in the quantum limit in gated and aligned carbon nanotubes 

      Yanagi, Kazuhiro; Okada, Ryotaro; Ichinose, Yota; Yomogida, Yohei; Katsutani, Fumiya; Gao, Weilu; Kono, Junichiro (2018)
      Confined electrons collectively oscillate in response to light, resulting in a plasmon resonance whose frequency is determined by the electron density and the size and shape of the confinement structure. Plasmons in metallic ...
    • Development of a universal, tunable, miniature fluorescence microscope for use at the point of care 

      Wong, Cynthia; Pawlowski, Michal E.; Forcucci, Alessandra; Majors, Catherine E.; Richards-Kortum, Rebecca; Tkaczyk, Tomasz S. (2018)
      Fluorescence microscopy can be a powerful tool for cell-based diagnostic assays; however, imaging can be time consuming and labor intensive to perform. Tunable systems give the ability to electronically focus at user ...
    • Flexible and stackable terahertz metamaterials via silver-nanoparticle inkjet printing 

      Kashiwagi, K.; Xie, L.; Li, X.; Kageyama, T.; Miura, M.; Miyashita, H.; Kono, J.; Lee, S.-S. (2018)
      There is presently much interest in tunable, flexible, or reconfigurable metamaterial structures that work in the terahertz frequency range. They can be useful for a range of applications, including spectroscopy, sensing, ...
    • Conveying language through haptics: a multi-sensory approach 

      Dunkelberger, Nathan; Sullivan, Jenny; Bradley, Joshua; Walling, Nickolas P.; Manickam, Indu; Dasarathy, Gautam; Israr, Ali; Lau, Frances W.Y.; Klumb, Keith; Knott, Brian; Abnousi, Freddy; Baraniuk, Richard; O'Malley, Marcia K. (2018)
      In our daily lives, we rely heavily on our visual and auditory channels to receive information from others. In the case of impairment, or when large amounts of information are already transmitted visually or aurally, ...
    • Uncovering temporal structure in hippocampal output patterns 

      Maboudi, Kourosh; Ackermann, Etienne; de Jong, Laurel Watkins; Pfeiffer, Brad E.; Foster, David; Diba, Kamran; Kemere, Caleb (2018)
      Place cell activity of hippocampal pyramidal cells has been described as the cognitive substrate of spatial memory. Replay is observed during hippocampal sharp-wave-ripple-associated population burst events (PBEs) and is ...
    • 3D printed fiber optic faceplates by custom controlled fused deposition modeling 

      Wang, Ye; Gawedzinski, John; Pawlowski, Michal E.; Tkaczyk, Tomasz S. (2018)
      A 3D printing technique for manufacturing air-clad coherent fiber optic faceplates is presented. The custom G-code programming is implemented on a fused deposition modeling (FDM) desktop printer to additively draw optical ...
    • Magnetooptics of Exciton Rydberg States in a Monolayer Semiconductor 

      Stier, A.V.; Wilson, N.P.; Velizhanin, K.A.; Kono, J.; Xu, X.; Crooker, S.A. (2018)
      We report 65 T magnetoabsorption spectroscopy of exciton Rydberg states in the archetypal monolayer semiconductor WSe2. The strongly field-dependent and distinct energy shifts of the 2s, 3s, and 4s excited neutral excitons ...
    • Effects of etchants in the transfer of chemical vapor deposited graphene 

      Wang, M.; Yang, E.H.; Vajtai, R.; Kono, J.; Ajayan, P.M. (2018)
      The quality of graphene can be strongly modified during the transfer process following chemical vapor deposition (CVD) growth. Here, we transferred CVD-grown graphene from a copper foil to a SiO2/Si substrate using wet ...
    • Data-Driven Model Order Reduction of Linear Switched Systems in the Loewner Framework 

      Gosea, I.V.; Petreczky, M.; Antoulas, A.C. (2018)
      The Loewner framework for model reduction is extended to the class of linear switched systems. One advantage of this framework is that it introduces a trade-off between accuracy and complexity. Moreover, through this ...
    • Carbon nanotube woven textile photodetector 

      Zubair, Ahmed; Wang, Xuan; Mirri, Francesca; Tsentalovich, Dmitri E.; Fujimura, Naoki; Suzuki, Daichi; Soundarapandian, Karuppasamy P.; Kawano, Yukio; Pasquali, Matteo; Kono, Junichiro (2018)
      The increasing interest in mobile and wearable technology demands the enhancement of functionality of clothing through incorporation of sophisticated architectures of multifunctional materials. Flexible electronic and ...
    • Mutual Information in Frequency and Its Application to Measure Cross-Frequency Coupling in Epilepsy 

      Malladi, Rakesh; Johnson, Don H.; Kalamangalam, Giridhar P.; Tandon, Nitin; Aazhang, Behnaam (2018)
      We define a metric, mutual information in frequency (MI-in-frequency), to detect and quantify the statistical dependence between different frequency components in the data, referred to as cross-frequency coupling and apply ...