A5063205565- Advanced MEMS and NEMS Technologies
- Acoustic Wave Phenomena Research
- Mechanical and Optical Resonators
- Nonlocal and gradient elasticity in micro/nano structures
- Speech and Audio Processing
- Force Microscopy Techniques and Applications
- Advanced Sensor and Energy Harvesting Materials
- Acoustic Wave Resonator Technologies
- Advanced Fiber Optic Sensors
- Particle accelerators and beam dynamics
- Piezoelectric Actuators and Control
- Ferroelectric and Piezoelectric Materials
- Geophysics and Sensor Technology
- X-ray Spectroscopy and Fluorescence Analysis
- Ferroelectric and Negative Capacitance Devices
- Particle Accelerators and Free-Electron Lasers
- Electrowetting and Microfluidic Technologies
- High-pressure geophysics and materials
- Advanced Materials and Mechanics
- Vascular Malformations Diagnosis and Treatment
- Electromagnetic Launch and Propulsion Technology
- Metamaterials and Metasurfaces Applications
- Environmental Monitoring and Data Management
- Ion-surface interactions and analysis
- Guidance and Control Systems
École Polytechnique Fédérale de Lausanne
2021-2025
New Mexico State University
2023
European Organization for Nuclear Research
2018-2019
Abstract Mitigating the energy requirements of artificial intelligence requires novel physical substrates for computation. Phononic metamaterials have vanishingly low power dissipation and hence are a prime candidate green, always‐on computers. However, their use in machine learning applications has not been explored due to complexity design process. Current phononic restricted simple geometries (e.g., periodic tapered) do possess sufficient expressivity encode tasks. A non‐periodic...
Complex oxides offer a wide range of functional properties, and recent advances in the fabrication freestanding membranes these are adding new mechanical degrees freedom to this already rich ecosystem. Here, photoactuation is demonstrated thin film resonators ferroelectric Barium Titanate (BaTiO
The unique mechanical and electrical properties of graphene make it an exciting material for nanoelectromechanical systems (NEMS). NEMS resonators with springs facilitate studies graphene's fundamental characteristics thus enable innovative device concepts applications such as sensors. Here, we demonstrate resonant transducers ribbon-springs made double-layer proof masses silicon study their nonlinear mechanics at resonance both in air vacuum by laser Doppler vibrometry. Surprisingly,...
Abstract Measuring vibrations is essential to ensuring building structural safety and machine stability. Predictive maintenance a central internet of things (IoT) application within the new industrial revolution, where sustainability performance increase over time are going be paramount. To reduce footprint cost vibration sensors while improving their performance, sensor concepts needed. Here, double‐layer graphene membranes utilized with suspended silicon proof demonstrating operation as...
Flexoelectricity, inherent in all materials, offers a promising alternative to piezoelectricity for nanoscale actuation and sensing. However, its widespread application faces significant challenges: differentiating flexoelectric effects from those of other phenomena, verifying universality across material structures thicknesses, establishing comprehensive database coefficients different materials. This work introduces groundbreaking methodology that accurately isolates flexoelectricity...
Acceleration measurements are fundamental in applications such as consumer electronics, navigation, automotive safety and Internet of things (IoT). In comparison with capacitive or piezoresistive MEMS accelerometers, resonant graphene accelerometers have the potential to be smaller. If demonstrated, they could a step forward miniaturization enable emerging applications.In this paper, accelerations measured NEMS accelerometer based on graphene. The devices made suspended proof mass attached...
The ensemble Kalman filter (EnKF) method has proven to be a promising tool for reservoir model updating and history matching. However, because the EnKF requires that prior distributions parameters estimated are Gaussian, or approximately application facies models, channel systems in particular, been challenge. In this paper we suggest two different approaches parameterization of models terms Gaussian perturbations an existing "best guess" model. Method 1 is inspired by level set methods,...
A study of irradiation-induced damage in HAVAR ® foils was initiated order to extract the highest proton dose can sustain. The lattice structure different metallurgic conditions is presented, as well visible internal structure, measured by Transmission Electron Microscopy (TEM). Positron Annihilation Spectroscopy (PAS) techniques were used investigate these foils, and another foil that had been irradiated maximal limit, set manufacturer a total charge 1 mAh (= 3.6 C). PAS included Doppler...
Flexoelectricity is universal in all dielectrics, effective at high temperatures, and a promising transduction technique for nanoelectromechanical systems (NEMS). However, as flexoelectricity still its early stages, many aspects require further investigation. Understanding how depends on material parameters like crystallographic phase temperature might affect it important selecting optimizing the right technological applications. This work studies influence of high-temperature annealing (and...
Flexoelectricity is a property of all dielectric materials, where inhomogeneous strain induces electrical polarization. This effect becomes particularly prominent at the nanoscale larger gradients can be obtained. While flexoelectric charges have been measured in mm-scale systems, direct measurements nanoscale-thickness materials not yet achieved. Given that one most applications flexoelectricity nano-electro-mechanical systems (NEMS), confirming presence and magnitude these scales...
Flexoelectricity, inherent in all materials, offers a promising alternative to piezoelectricity for nanoscale actuation and sensing. However, its widespread application faces significant challenges: differentiating flexoelectric effects from those of other phenomena, verifying universality across material structures thicknesses, establishing comprehensive database coefficients different materials. This work introduces groundbreaking methodology that accurately isolates flexoelectricity...
Flexoelectricity is universal in all dielectrics, effective at high temperatures, and a promising transduction technique for nanoelectromechanical systems (NEMS). However, as flexoelectricity still its early stages, many aspects require further investigation. Understanding how depends on material parameters like crystallographic phase temperature might affect it, important selecting optimizing the right technological applications. This work studies influence of high-temperature annealing...
The performance of the CERN Low Energy Ion Ring with electron cooled ion beams is presently limited by losses occurring once beam has been captured in RF buckets. An intense machine study program was started end 2015 to mitigate and improve accelerator. measurements pointed interplay direct space charge forces excited betatron resonances as most plausible driving mechanism these losses. In this paper, we present systematic space-charge performed 2017 compare them tracking simulations based...
To detect spoken commands, smart devices (for example, a speaker with Alexa or Siri) continuously convert acoustic waves to electronic signals, translate them into the digital domain, and analyze in signal processor. Each of these steps constantly consumes energy, imposing need for tethered operation large batteries. We propose solve this problem using elastic neural networks, metamaterials consisting arrays coupled (potentially nonlinear) resonators. The frequencies couplings resonators are...
Mitigating the energy requirements of artificial intelligence requires novel physical substrates for computation. Phononic metamaterials have a vanishingly low power dissipation and hence are prime candidate green, always-on computers. However, their use in machine learning applications has not been explored due to complexity design process: Current phononic restricted simple geometries (e.g. periodic, tapered), do possess sufficient expressivity encode tasks. We fabricate non-periodic...
Complex oxides offer a wide range of functional properties, and recent advances in fabrication freestanding membranes these are adding new mechanical degrees freedom to this already rich ecosystem. Here, we demonstrate photoactuation thin film resonators ferroelectric Barium Titanate (BaTiO3) paraelectric Strontium (SrTiO3). The free-standing films, transferred onto perforated supports, act as nano-drums, oscillating at their natural resonance frequency when illuminated by...
Abstract Complex oxides offer a range of functional properties and recent advances in fabrication freestanding membranes these have enabled enhanced functionality novel manipulation strategies. Here, we demonstrate photoactuation on thin film resonators ferroelectric Barium Titanate (BaTiO 3 ) paraelectric Strontium (SrTiO ). The act as nano-drums, oscillating at their natural resonance frequency when illuminated by frequency-modulated laser. Upon illumination, large out-of-plane deflections...
The preliminary design, analysis, and testing of a rapid release centrifugal projectile launcher is being done to verify the use new technology as viable way launch projectiles with little no fuel-based propulsion systems such motor. initial design proposes small arm ten inches in length which used for mechanism well timing at low rpm. A second model also proposed an radius two one-half feet. large utilizes vacuum increased aerodynamic performance. final angular velocity three thousand five...
Abstract The equilibrium emittance of the Pb beam in CERN Low Energy Ion Ring (LEIR) results from interplay electron cooling and heating processes, as intra-beam scattering space charge. In this paper we present measurements evolution a function intensity, working point resonance excitation, compare them with simulations processes. Optimum settings for normal skew sextupoles have been found compensation resonances excited by lattice.