Now showing items 70-83 of 83

    • Second harmonic microscopy of monolayer MoS2 

      Kumar, Nardeep; Najmaei, Sina; Cui, Qiannan; Ceballos, Frank; Ajayan, Pulickel M.; Lou, Jun; Zhao, Hui (2013)
      We show that the lack of inversion symmetry in monolayer MoS2 allows strong optical second harmonic generation. The second harmonic of an 810-nm pulse is generated in a mechanically exfoliated monolayer, with a nonlinear ...
    • Sparse and low-rank methods in structural system identification and monitoring 

      Nagarajaiah, Satish (2017)
      This paper presents sparse and low-rank methods for explicit modeling and harnessing the data structure to address the inverse problems in structural dynamics, identification, and data-driven health monitoring. In particular, ...
    • Strain rate dependent mechanical properties in single crystal nickel nanowires 

      Peng, Cheng; Zhong, Yuan; Lu, Yang; Narayanan, Sankar; Zhu, Ting; Lou, Jun (2013)
      We measure the strain rate dependence of 0.2% offset yield stress in single-crystal nickel nanowires with diameters ranging from 80 to 300 nm. In situ tensile experiments with strain rates from 10 4 s 1 to 10 2 s 1 were ...
    • Study of a piecewise linear dynamic system with negative and positive stiffness 

      Zou, Keguan; Nagarajaiah, Satish (2014)
      The present paper mainly focuses on numerical and analytical study of a piecewise linear dynamic oscillator with negative stiffness followed by positive stiffness which has not been studied to date. The dynamic system of ...
    • Super-stretchable, Transparent Carbon Nanotube-Based Capacitive Strain Sensors for Human Motion Detection 

      Cai, Le; Song, Li; Luan, Pingshan; Zhang, Qiang; Zhang, Nan; Gao, Qingqing; Zhao, Duan; Zhang, Xiao; Tu, Min; Yang, Feng; Zhou, Wenbin; Fan, Qingxia; Luo, Jun; Zhou, Weiya; Ajayan, Pulickel M.; Xie, Sishen (2013)
      Realization of advanced bio-interactive electronic devices requires mechanically compliant sensors with the ability to detect extremely large strain. Here, we design a new multifunctional carbon nanotube (CNT) based capacitive ...
    • Supercapacitor Operating At 200 Degrees Celsius 

      Borges, Raquel S.; Reddy, Arava Leela Mohana; Rodrigues, Marco-Tulio F.; Gullapalli, Hemtej; Balakrishnan, Kaushik; Silva, Glaura G.; Ajayan, Pulickel M. (2013)
      The operating temperatures of current electrochemical energy storage devices are limited due to electrolyte degradation and separator instability at higher temperatures. Here we demonstrate that a tailored mixture of ...
    • Systematic Construction of Higher Order Bases for the Finite Element Analysis of Multiscale Elliptic Problems 

      Soghrati, Soheil; Stanciulescu, Ilinca (2013)
      We introduce a new approach to deriving higher order basis functions implemented in the Multiscale Finite Element Method (MsFEM) for elliptic problems. MsFEM relies on capturing small scale features of the system through ...
    • The effect of robot dynamics on smoothness during wrist pointing 

      Erwin, Andrew; Pezent, Evan; Bradley, Joshua; O’Malley, Marcia K. (2017)
      The improvement of movement smoothness over the course of therapy is one of the positive outcomes observed during robotic rehabilitation. Although movements are generally robust to disturbances, certain perturbations might ...
    • The Rice Haptic Rocker: Skin stretch haptic feedback with the Pisa/IIT SoftHand 

      Battaglia, Edoardo; Clark, Janelle P.; Bianchi, Matteo; Catalano, Manuel G.; Bicchi, Antonio; O’Malley, Marcia K. (2017)
      Myoelectric prostheses have seen increased application in clinical practice and research, due to their potential for good functionality and versatility. Yet, myoelectric prostheses still suffer from a lack of intuitive ...
    • Toward training surgeons with motion-based feedback: Initial validation of smoothness as a measure of motor learning 

      Pandey, Shivam; Byrne, Michael D.; Jantscher, William H.; O’Malley, Marcia K.; Agarwal, Priyanshu (2017)
      Surgery is a challenging domain for motor skill acquisition. A critical contributing factor in this difficulty is that feedback is often delayed from performance and qualitative in nature. Collection of highdensity motion ...
    • Trajectory Deformations From Physical Human–Robot Interaction 

      Losey, Dylan P.; O’Malley, Marcia K. (2018)
      Robots are finding new applications where physical interaction with a human is necessary, such as manufacturing, healthcare, and social tasks. Accordingly, the field of physical human-robot interaction (pHRI) has leveraged ...
    • Universal ac conduction in large area atomic layers of CVD-grown MoS2 

      Ghosh, S.; Najmaei, S.; Kar, S.; Vajtai, R.; Lou, J.; Pradhan, N.R.; Balicas, L.; Ajayan, P.M.; Talapatra, S. (2014)
      Here, we report on the ac conductivity [σ’(ω); 10 mHz < ω < 0.1 MHz] measurements performed on atomically thin, two-dimensional layers of MoS2 grown by chemical vapor deposition (CVD). Σ’(ω) is observed to display a ...
    • Use of Active Learning to Design Wind Tunnel Runs for Unsteady Cavity Pressure Measurements 

      Srivastava, Ankur; Meade, Andrew J. (2014)
      Wind tunnel tests to measure unsteady cavity flow pressure measurements can be expensive, lengthy, and tedious. In this work, the feasibility of an active machine learning technique to design wind tunnel runs using proxy ...
    • Using the Plasmon Linewidth To Calculate the Time and Efficiency of Electron Transfer between Gold Nanorods and Graphene 

      Hoggard, Anneli; Wang, Lin-Yung; Ma, Lulu; Fang, Ying; You, Ge; Olson, Jana; Liu, Zheng; Chang, Wei-Shun; Ajayan, Pulickel M.; Link, Stephan (2013)
      We present a quantitative analysis of the electron transfer between single gold nanorods and monolayer graphene under no electrical bias. Using single-particle dark-field scattering and photoluminescence spectroscopy to ...