Abhijit Chandra Roy

ORCID: 0000-0002-1801-289X
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Research Areas
  • Electrowetting and Microfluidic Technologies
  • Tactile and Sensory Interactions
  • Advanced Sensor and Energy Harvesting Materials
  • Microfluidic and Capillary Electrophoresis Applications
  • Modular Robots and Swarm Intelligence
  • Brain Tumor Detection and Classification
  • Advanced optical system design
  • Surface Modification and Superhydrophobicity
  • Interactive and Immersive Displays
  • Nuclear Physics and Applications
  • Nuclear physics research studies
  • Advanced Fiber Optic Sensors
  • Silicon Nanostructures and Photoluminescence
  • Advanced Biosensing Techniques and Applications
  • Astronomical and nuclear sciences
  • Radioactivity and Radon Measurements
  • Plasmonic and Surface Plasmon Research
  • Advanced Computing and Algorithms
  • Impact of Light on Environment and Health
  • Advanced MEMS and NEMS Technologies
  • Nanowire Synthesis and Applications
  • Electrostatic Discharge in Electronics
  • Wireless Power Transfer Systems
  • Advanced Materials and Mechanics
  • Photonic and Optical Devices

Aryabhatta Research Institute of Observational Sciences
2024

National Institute of Technology Durgapur
2016-2024

Indian Institute of Information Technology Guwahati
2024

Indian Institute of Technology Guwahati
2024

Indian Institute of Science Bangalore
1992-2022

Siksha O Anusandhan University
2020

Bhabha Atomic Research Centre
2009-2019

Indian Institute of Technology Kanpur
2009-2017

We estimate the relative contributions of decay channels arising from various Coster-Kronig (CK) and initial-state shake processes to satellite intensity accompanying ${\mathit{L}}_{2}$- ${\mathit{L}}_{3}$-${\mathit{M}}_{45}$${\mathit{M}}_{45}$ Auger spectra Cu. While ratios between ${\mathit{L}}_{3\mathrm{\ensuremath{-}}}$${\mathit{M}}_{45}$${\mathit{M}}_{45}$ spectral features in Fe Co also exhibit pronounced effects ${\mathit{L}}_{2}$-${\mathit{L}}_{3}$${\mathit{M}}_{45}$ transition, CK...

10.1103/physrevb.48.6822 article EN Physical review. B, Condensed matter 1993-09-01

Aspherical optical lenses with spatially varying curvature are desired for capturing high quality, aberration free images in numerous applications. Conventionally such prepared by multistep top-down processes which expensive, time-consuming, and prone to failure rate. In this context, an alternate method is presented here based on arrested spreading of a sessile drop transparent, cross-linkable polymeric liquid solid substrate heated elevated temperature. Whereas surface tension driven flow...

10.1021/acs.langmuir.5b04631 article EN Langmuir 2016-05-20

We report x-ray photoelectron spectra from a porous silicon film (PSF) with photoluminescence peak at 1.8 eV, as function of argon ion etching time to probe the composition in surface and subsurface regions. The results clearly indicate that layer is essentially fluorine admixed SiO2 phase, while Si:O:F region 2:1:0.2. With possibility existence hydrogen this it appears beyond highly oxidized surface, PSF substituted siloxene derivative, which can be responsible for visible photoluminescence.

10.1063/1.108442 article EN Applied Physics Letters 1992-10-05

Soft electronic skin (soft-e-skin) capable of sensing touch and pressure similar to human is essential in many applications, including robotics, healthcare, augmented reality. However, most the research effort on soft-e-skin was confined lab-scale demonstration. Several hurdles remain challenging, such as highly complex expensive fabrication processes, instability long-term use, difficulty producing large areas mass production. Here, we present a robust 3D printable large-area made soft...

10.1021/acsbiomaterials.2c00241 article EN ACS Biomaterials Science & Engineering 2022-07-27

Slithering, crawling, slipping, and gliding are various modes of limbless locomotion that have been mimicked for micro-manipulation soft, slender sessile objects. A lesser known mode is rolling which involves periodic, asymmetric lateral muscular deformations. Here we enable an elastomeric cylinder poly(dimethylsiloxane) to roll on a substrate by releasing small quantity solvent like chloroform, toluene, hexane, heptane so on, swells differentially portion the cylinder, but evaporates from...

10.1039/c2sm07282c article EN Soft Matter 2012-01-01

Preparation of an optical lens by wetting a curved surface deformable solid with liquid is described. A channel circular/elliptical cross-section embedded inside elastomeric layer used as the surface; its reduces interfacial tension. Consequently thin skin bulges out, which results in aspherical lens. filter generated using desired color channel.

10.1002/adom.201400081 article EN Advanced Optical Materials 2014-05-30

Aspheric optical lenses are important for a variety of applications but difficult to fabricate in conventional top-down processes. Here, we have presented bottom-up approach involving controlled spreading thermally crosslinkable polymeric liquid dispensed on specially prepared substrates making aspheric bi-convex lenses. In particular, the substrate is solid film with tiny hole drilled it through which can flow and out from top bottom side substrate. addition, two surfaces made similar or...

10.1063/1.4978353 article EN Applied Physics Letters 2017-03-06

We present an on chip optofluidic surface deformable liquid Dove prism (LDP) based low-fluid flow pressure monitoring device. The unique design of the device in combination with and soft solid enabled by total internal reflection light makes sensor highly sensitive compatible integration a microfluidic and/or Lab-on-a-chip A layer-by-layer lithographic (LSL) 3D printing technique are exploited to make have used Polydimethylsiloxane (PDMS) as layer material two variety liquids (a) immersion...

10.1002/jbio.202000381 article EN Journal of Biophotonics 2020-11-10

Neutron deficient nuclei from $^{74}$Se$-^{196}$Hg are thought to be produced by $\gamma$-induced reactions ($\gamma$,n), ($\gamma$,p) and ($\gamma,\alpha$) processes. The relatively high abundance of $^{113}$In odd A $p$-nuclei has inspired study its production As reaction with $\gamma$-beam is difficult perform in the laboratory, rate calculated inverse data employing reciprocity theorem. Stacked foil activation method was used measure $^{113}$In($\alpha,\gamma$) $^{113}$In($\alpha$, n)...

10.48550/arxiv.2401.06478 preprint EN other-oa arXiv (Cornell University) 2024-01-01

Neutron deficient nuclei from are thought to be produced by -induced reactions , and (𝛾,𝛼) processes. The stacked foil activation method was used measure the 113In⁢(𝛼,𝛾) reaction cross section at 𝐸lab=8.29–17.78MeV. 113In⁢(𝛼,𝑛) also measured 𝐸lab=9.80–17.78MeV. for first time 𝐸lab=8.29±0.76MeV (𝜎=1.5±0.3µ⁢b). Vacuum evaporation technique preparing targets (60–85µ⁢g⁡/cm2). Theoretical statistical model calculations were performed with different nuclear input parameters compared experimental...

10.1103/physrevc.110.065807 article EN Physical review. C 2024-12-30

Arching is a universal phenomenon that involves transfer of pressure from the yielding part soil to adjoining part. The said arch over support. state stress within zone arching depends upon amount yield. As increases, effect gradually reduced. Though occurs in many geotechnical engineering problems, it has not received much attention. Generally, using Rankine's and Coulomb's theory, earth exerted by on retaining wall calculated. Both them assumed distribution triangular. Many experimental...

10.1061/41031(341)304 article EN Structures Congress 2019 2009-04-29

Initially when power is supplied, induction motor runs at its rated speed with the recommended specifications and varying applications.Control of motor's improvement dynamic steady state characteristics which are non-linear in nature, has been possible due to advancement electronics.The popularity this resulted into lot research including transient behavior motor.A methodology based on modeling capabilities along control computer simulation proposed paper represented by three-phase four pole...

10.22161/ijaers/3.12.42 article EN International Journal of Advanced Engineering Research and Science 2016-01-01

Modern the atrical performances are being lighted largely by projected light. For this work, many types and sizes of incandescent lamps, spotlights, floodlights have been developed. These same projectors also find wide application for lighting pageants, dance halls, other similar institutions. The one unit, however, where arc lamp spot has reigned supreme in high power spot. Where a long throw is used, small intense uniform distribution required, Mazda unable to compete with arc. This due...

10.5594/j10308 article EN Transactions of the Society of Motion Picture Engineers 1926-03-01

On page 874, A. C. Roy and Ghatak show that an aspherical lens can be easily made by embedding microchannels in soft elastomeric layers filling them with a liquid wets the surface of elastomer. The channel wall bulges out due to elasto-capillary effect assumes profile which used as optical lens. Filling desired color, it is possible also make compact lens-filter system.

10.1002/adom.201470058 article EN Advanced Optical Materials 2014-09-01

Summary form only given. This paper deals with the discharge along surface of angled insulators in compressed gases using 3D finite difference particle-in-cell simulation. The simulation is carried pure nitrogen at atmospheric pressure. ionization neutral atoms takes place by electron impact leading to production positive ions and secondary electrons. cross sections electrons gas molecules are taken as function energy. pulse rise time 5ns duration 50ns. spacer angle `θ' measured between...

10.1109/plasma.2013.6635147 article EN 2013 Abstracts IEEE International Conference on Plasma Science (ICOPS) 2013-06-01

Multiple Sclerosis (MS) has been proven as a disease to potentially attack the Central Nervous System and render patient disabled in most cases. In light of medical advancements, it is observed that worst can be prevented if detected early stages proper measures adapted. Despite significant progress field, manual detection MS lesions remains an uphill battle, owing requirement particular expertise more extended periods. With respect recent success rate convolutional neural network-based...

10.2139/ssrn.4530464 preprint EN 2023-01-01

Abstract Soft artificial skin capable of sensing touch, pressure and bending similar to soft human is important in many modern-day applications including socially interactive robotics, modern healthcare, augmented reality, etc. However, most the research effort on are confined lab-scale demonstration. We have demonstrated how a fundamental understanding contact mechanics material specially constructed optical waveguide let us develop highly efficient, resilient, large-area for futuristic...

10.21203/rs.3.rs-763714/v1 preprint EN cc-by Research Square (Research Square) 2021-08-02
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