A5035528728- Geophysics and Gravity Measurements
- Inertial Sensor and Navigation
- Mechanical and Optical Resonators
- Advanced MEMS and NEMS Technologies
- Acoustic Wave Resonator Technologies
- Geophysics and Sensor Technology
- Pulsars and Gravitational Waves Research
- Geophysical and Geoelectrical Methods
- Computational Physics and Python Applications
- Reservoir Engineering and Simulation Methods
- Vehicle Noise and Vibration Control
- Force Microscopy Techniques and Applications
- Analytical Chemistry and Sensors
- Experimental and Theoretical Physics Studies
- Spacecraft Design and Technology
- Patient-Provider Communication in Healthcare
- Advanced Measurement and Metrology Techniques
- Microfluidic and Bio-sensing Technologies
- Acoustic Wave Phenomena Research
- Palliative Care and End-of-Life Issues
- Sensor Technology and Measurement Systems
- Seismic Waves and Analysis
- Scientific Research and Discoveries
- Family and Patient Care in Intensive Care Units
- Geological Modeling and Analysis
Vellore Institute of Technology University
2024
University of Glasgow
2018-2023
UMass Memorial Health Care
2023
University of Massachusetts Chan Medical School
2023
City of Glasgow College
2022
Indian Institute of Technology BHU
2021
Banaras Hindu University
2021
Indian Institute of Technology Bombay
2018
University of Cambridge
2014-2017
Mahindra Group (India)
2014-2017
Knowledge of the spatio-temporal changes in characteristics and distribution subsurface fluids is key to properly addressing important societal issues, including: sustainable management energy resources (e.g., hydrocarbons geothermal energy), water resources, assessment hazard volcanic eruptions). Gravimetry highly attractive because it can detect mass, thus providing a window into processes that involve deep fluids. However, high cost operating features associated with current...
Abstract Background Shared decision-making is a joint process where patients, or their surrogates, and clinicians make health choices based on evidence preferences. We aimed to determine the extent predictors of shared for goals-of-care discussions critically ill neurological which crucial patient-goal-concordant care but currently unknown. Methods analyzed 72 audio-recorded routine clinician-family meetings during were discussed from seven US hospitals. These occurred 67 patients with...
Abstract The measurement of tiny variations in local gravity enables the observation subterranean features. Gravimeters have historically been extremely expensive instruments, but usable measurements recently conducted using MEMS (microelectromechanical systems) sensors. Such sensors are cheap to produce, since they rely on same fabrication techniques used produce mobile phone accelerometers. A significant challenge development gravimeters is maintaining stability over long time periods,...
A bulk acoustic mode micro-electro-mechanical dual resonator platform is utilised to study the evaporation of sub-microliter water droplets from surface resonator. An analytical formulation for observed frequency shift and measure dependence resonant on modes which consistent with optically derived data. The resonators access only a thin layer liquid through shear contact and, hence, response not affected by mass droplet first order. relationship between area elapsed time was established...
Current portable particle detection instruments typically rely on optical methods which are limited to 100 nm diameter particles. Microfabricated bulk acoustic resonators, when used as mass balances, could take below this limit. This study examines the collection of particles onto piezoelectric mode resonators from gaseous flow using classical impaction. Collection both polystyrene latex and α-pinene secondary organic aerosol was examined in terms frequency shift efficiency. A new...
Gravimeters are used for measuring the local gravitational acceleration. The use of current commercially available gravimeters, however, has been limited by their high cost and large size. In this study, a microelectromechanical system (MEMS) based relative gravimeter with an acceleration sensitivity 8 μGall / √ (Hz) is demonstrated. MEMS gravimeter, along custom interface electronics, embedded on battery powered portable platform. platform enables continuous recording sensor response, while...
Abstract Zinc oxide (ZnO) has been extensively investigated for use in large‐area electronics; particular, the solution‐processing routes have shown increasing promise towards low‐cost fabrication. However, top‐down fabrication approaches with nanoscale resolution, aggressively scaled device platforms, are still underexplored. This study reports a novel approach of direct‐write electron‐beam lithography (DW‐EBL) solution precursors as negative tone resists, followed by optimal precursor...
This paper reports micromachined piezoelectric-on-silicon bulk acoustic wave resonators operating at a nominal frequency of approximately 3.15 MHz in fluidic media. Electrical measurements the open-loop response when one resonator surfaces is submerged water indicate high quality factors range 110–190. These values factor are least an order magnitude higher than flexural mode counterparts. The further exposed to Glycerol-Water mixtures varying viscosity-density resulting characteristic...
Microfabricated in-plane bulk acoustic resonators can be configured as gravimetric sensors wherein the mass of surface-bound species is transduced a shift in resonant frequency. Using this principle, we examine adsorption spherical polystyrene latex particles on resonator surface by drying particulate laden droplets. Distribution governed coffee-ring effect which correlated to observed frequency response resonators. We also present an analytical approach describe spatial dependence adsorbed...
Progress in nanotechnology has led to sensors that can detect very small numbers of analyte particles---down the level individual molecules. However, observed signal often depends on not just how many particles are adsorbed, but also exactly $w\phantom{\rule{0}{0ex}}h\phantom{\rule{0}{0ex}}e\phantom{\rule{0}{0ex}}r\phantom{\rule{0}{0ex}}e$ each landed a nanomechanical resonator. This study presents general theoretical framework for quantitative interpretation such results, aid design robust...
This paper describes a technique for temperature sensitivity or thermal sag measurements of geometric anti-spring based microelectromechanical system (MEMS) gravimeter (Wee-g). The Wee-g MEMS is currently fabricated on (100) silicon wafer using standard micro-nano fabrication techniques. behavior indicates that the Young's modulus decreases with increase in (∼64 ppm/K). leads to softening material, resulting proof mass displacing (or sagging) under influence increasing temperature. It...
A piezoelectrically transduced micromechanical beam acoustic resonator is utilized to detect solid liquid phase transitions in sub-nanoliter volume of Polyethylene Glycol (PEG) 1000. lower frequency flexural mode and a higher length-extensional are simultaneously monitored for changes the device response. The transition PEG drop perturbs loading resonator, bringing about characteristic repeatable verified optically, resonant parameters compared with control case when pristine without...
A single-axis Microelectromechanical system gravimeter has recently been developed at the University of Glasgow. The sensitivity and stability this device was demonstrated by measuring Earth tides. success enabled in part its extremely low resonant frequency. This frequency achieved with a geometric anti-spring design, fabricated using well-established photolithography dry etch techniques. Analytical models can be used to calculate results these non-linear oscillating systems, but power...
Wee-g is a new gravimeter that utilises micro-electromechanical system (MEMS) sensor. The use of MEMS-based sensors has benefits as gravimetry technology because the low cost base material silicon and accessibility manufacturing facilities will enable increased availability gravimeters. However, challenge working with for device its thermal sensitivity, which affects Young's Modulus material. In context Wee-g's sensor design, when flexures support proof mass become softer temperature...
Normalising flows is a novel generative neural network model, which can be applied to Bayesian parameter inference. When gravity inversion reformulated as probabilistic inference problem, stable results obtained that naturally incorporate the inherent uncertainties and noise from source background instrument. As opposed some standard methods, does not default single solution in an ill-posed but informs user about all possibilities are consistent with gravimetry survey of interest. It has...
Quantifying cellular behaviour by motility and morphology changes is increasingly important in formulating an understanding of fundamental physiological phenomena mechanisms disease. However, cells are complex biological units, which often respond to external environmental factors manifesting subtle responses that may be difficult interpret using conventional biophysical measurements. This paper describes the adaptation quartz crystal microbalance (QCM) monitor neuroblastoma undergoing...
This paper presents the design and characterization of a piezoelectrically-transduced (AlN) on silicon micro-mechanical resonator operating in its lateral bulk acoustic width-extensional mode at 28.73 MHz. The equivalent m-BVD model is extracted using least-squares-error algorithm which presented this paper. We report mechanical Q factor 5970 motional resistance Rx 273 Ω vacuum (p0 = 30 mTorr) for fundamental 240 μm × 149 resonator. A good fit between experimental data obtained numerical...