A5102832871- Innovative Energy Harvesting Technologies
- Energy Harvesting in Wireless Networks
- Multiferroics and related materials
- Advanced MEMS and NEMS Technologies
- Mechanical and Optical Resonators
- Wireless Power Transfer Systems
- Magnetic Properties and Applications
- Acoustic Wave Resonator Technologies
- Magnetic and transport properties of perovskites and related materials
- Ferroelectric and Piezoelectric Materials
- Molecular Junctions and Nanostructures
- Solidification and crystal growth phenomena
- Magnetic properties of thin films
- High voltage insulation and dielectric phenomena
- Graphene research and applications
- Power Transformer Diagnostics and Insulation
- Advanced biosensing and bioanalysis techniques
- Bluetooth and Wireless Communication Technologies
- Advanced Mathematical Modeling in Engineering
- Indoor and Outdoor Localization Technologies
- Theoretical and Computational Physics
- Peer-to-Peer Network Technologies
- Electrical Fault Detection and Protection
- Force Microscopy Techniques and Applications
- Advanced Data Storage Technologies
University of California, Berkeley
2011-2017
Universiti Teknologi Petronas
2011-2016
Petronas (Malaysia)
2013-2014
University of Birmingham
2011-2012
University of California, Riverside
2009-2011
A reversal of magnetization requiring only the application an electric field can lead to low-power spintronic devices by eliminating conventional magnetic switching methods. Here we show a nonvolatile, room temperature determined in ferromagnet-multiferroic system. The effect is reversible and mediated interfacial coupling dictated multiferroic. Such electric-field control magnetoelectric device demonstrates avenue for next-generation, low-energy consumption spintronics.
Exchange coupled CoFe/BiFeO3 thin-film heterostructures show great promise for power-efficient electric field-induced 180° magnetization switching. However, the coupling mechanism and precise qualification of exchange in have been elusive. Here we direct evidence field control magnetic state through field-dependent ferromagnetic resonance spectroscopy nanoscale spatially resolved imaging. Scanning electron microscopy with polarization analysis images reveal CoFe layer to canted moment BiFeO3...
This paper presents a bounded vibration energy harvester to effectively harvest from wide band of low-frequency environmental vibrations ranging 10 18 Hz. Rigid mechanical stoppers are used confine the seismic mass movement within elastic limits spring. Experimental results show effectiveness proposed technique in increasing efficiency harvester. When excited at frequency Hz with peak acceleration 1 g, responds higher 20 and gives power 2.68 mW voltage 2.62 V across load 220 Ω. The average...
Patterning of biomolecules on graphene layers could provide new avenues to modulate their electrical properties for novel electronic devices. Single-stranded deoxyribonucleic acids (ssDNAs) are found act as negative-potential gating agents that increase the hole density in single-layer graphene. Current-voltage measurements hybrid ssDNA/graphene system indicate a shift Dirac point and "intrinsic" conductance after ssDNA is patterned. The effect layer, which calculated be order 1.8 x 10(12)...
This paper presents an extended Kalman filter-based hybrid indoor position estimation technique which is based on integration of fingerprinting and trilateration approach. In this paper, Euclidian distance formula used for the first time instead radio propagation model to convert received signal estimates. combines features approach in a more simple robust way. The proposed works two stages. stage, it uses online phase calculates nearest neighbors (NN) target node, while second stage...
Electrostatic properties of proteins are crucial for their functionality. Carboxyamides small polar groups that, as peptide bonds, principal structural components that govern electrostatic properties. We investigated the medium dependence molar polarization and permanent dipole moments amides with different state alkylation. The experimentally measured theoretically calculated manifested a solvent increased increase in media polarity. ascribed observed enhancement amide to reaction fields...
The ability to automatically detect other vehicles on the road is vital safety of partially-autonomous and fully-autonomous vehicles. Most high-accuracy techniques for this task are based R-CNN or one its faster variants. In research community, much emphasis has been applied using 3D vision complex variants achieve higher accuracy. However, there more straightforward modifications that could deliver accuracy? Yes. We show increasing input image resolution (i.e. upsampling) offers up 12...
We use the micromagnetic model to simulate magnetization in a multidomain BiFeO3(BFO)/CoFe bilayer. show that CoFe couples weak ferromagnetism on BFO surface and breaks into domains correspond exactly with domains. Switching direction of spins switches corresponding reverses net magnetization. Since is coupled polarization BFO, this demonstrates mechanism for controlling reversal an electric field. Comparison experimental values moment hysteresis allows us extract BFO/CoFe exchange spin...
The microelectromechanical system (MEMS) is one of the most diversified fields microelectronics; it rated to be promising technology modern engineering. MEMS can sense, actuate, and integrate mechanical electromechanical components micro- nano sizes on a single silicon substrate using microfabrication techniques. industry at verge transforming semiconductor world into universe, apart from other hindrances; reliability these devices focal point recent research. Commercialization highly...
The publication of the Yahoo Flickr Creative Commons 100 Million dataset (YFCC100M)--to date largest open-access collection photos and videos--has provided a unique opportunity to stimulate new research in multimedia analysis retrieval. To make YFCC100M even more valuable, we have started working towards supplementing it with comprehensive set precomputed features high-quality ground truth annotations. As part our efforts, are releasing YLI feature corpus, as well YLI-GEO YLI-MED annotation...
We use in situ transmission electron microscopy to directly observe, at high temporal and spatial resolution, the interaction of ferroelectric domains dislocation networks within BiFeO3 thin films. The experimental observations are compared with a phase field model constructed simulate dynamics presence dislocations their resulting strain fields. demonstrate that global network misfit film-substrate interface can act as nucleation sites slow down domain propagation vicinity dislocations....
Vibration energy harvesting has got much research interest in recent years as non-exhaustive power source of wireless sensor nodes and wearable electronics. In case electronics body network the frequency vibration produced by human passive motion is low 1-10Hz. At such a harvestable reduces dramatically, leading researchers to suggest mechanical up-conversion techniques. This paper presents challenges at frequencies overviews techniques suggested literature.
We study multiple rule-based and machine learning (ML) models for sepsis detection. report the first neural network detection prediction results on three categories of sepsis. have used retrospective Medical Information Mart Intensive Care (MIMIC)-III dataset, restricted to intensive care unit (ICU) patients. Features were created from only common vital sign measurements. show significant improvement AUC score using based ensemble model compared single ML models. For sepsis, severe septic...
This paper presents the design of an Extended Gradient Predictor and Filter for smoothing Received Signal Strength Indicator (RSSI). In wireless communication RSSI is a measurement power in received signal, which parameter used handover position estimation purpose. real time applications such as requires continuous reception measurements. Due to effect noise, variations occur sometimes produce holes. that case, measurements become zero, produces distance error. order minimize communication,...
Mechanical frequency up-conversion has been suggested by many researchers in order to increase power density of kinetic energy harvesters. In this paper analytical analysis mechanism carried out some detail. It shown that sources actuation for a increased generator can be categorized as force limited and displacement sources. Maximum transferring conditions have investigated both types. The settling time the transient motion high oscillator dependent on seismic mass. Effects premature...
In this work, we report a massively parallel and time domain implementation of the 3D phase field model that can reach beyond micron scale consider for arbitrary electrical mechanical boundary conditions. The first part paper describes theory numerical model. A mixed-mode approach finite difference element grid has been used calculating nonlocal electrostatic elastic interactions respectively. All local non-local are shown to linearly up thousands processors. This massive paralleling allows...
This paper reports design, modeling and simulation of MEMS based sensor working in dynamic mode with fully differential piezoresistive sensing for monitoring the concentration exhaled carbon dioxide (CO2) gas human breath called capnometer. CO2 being a very important biomarker, it is desirable to extend scope its beyond clinical use home ambulatory services. Currently capnometers adaption limited by high cost, large size power consumption conventional . In recent years, micro resonant...
Capnometers monitor the concentration of CO2 in exhaled breath, which can be a life saving modality. High cost, big size and high power consumption conventional capnometers limit their scope adaption. To overcome these issues, CMOS MEMS microcantilever based sensor is proposed for capnometric applications. The manufactured using technology its critical parameters are analytically investigated. optimized has quality factor, sensitivity resolution 3116, 16 mHz/ppm 0.31 ppb, respectively.
Capnometers measure the concentration of CO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> in exhaled breath which could prevent serious problems all areas healthcare, from pre-hospital to extended care, and everywhere between. Presently, high cost, big size power usage limit scope conventional capnometers their adaption. To overcome these issues, a CMOS MEMS micro-cantilever has been proposed for capnometric applications. Analytical...