- ZnO doping and properties
- Gas Sensing Nanomaterials and Sensors
- Nanofluid Flow and Heat Transfer
- Analytical Chemistry and Sensors
- Heat Transfer Mechanisms
- Fluid Dynamics and Turbulent Flows
- Heat and Mass Transfer in Porous Media
- Heat Transfer and Optimization
- Copper-based nanomaterials and applications
- Natural Antidiabetic Agents Studies
- Advanced Chemical Sensor Technologies
- Fluid Dynamics and Thin Films
- Multiferroics and related materials
- Perovskite Materials and Applications
- Magnetic and transport properties of perovskites and related materials
- Medicinal Plants and Neuroprotection
- Enhanced Recovery After Surgery
- Nanofabrication and Lithography Techniques
- Metal complexes synthesis and properties
- Pelvic floor disorders treatments
- Crystallography and molecular interactions
- Phytochemicals and Medicinal Plants
- Bryophyte Studies and Records
- Bee Products Chemical Analysis
- Microbial Metabolism and Applications
Tribhuvan University
2020-2024
Kathmandu University
2023
Clarivate (United States)
2023
Sungkyunkwan University
2022
Samsung (South Korea)
2022
Kyungpook National University
2021
Pokhara University
2017-2019
Centre for Bhutan Studies and GNH Research
2012
Background: Himalayan honey, a natural product of wild honey bees found in the mountains Nepal, has been used medicine for many years. The successful development nanotechnology and beneficial effects would bring new opportunity to synthesize hybrid nanomaterials biomedical applications. Thus, purpose this study was load onto iron oxide nanoparticles (IO-NPs) their antioxidant antimicrobial activities. Methods: loaded (HHLIO-NPs) were synthesized X-ray diffraction (XRD) scanning electron...
Monitoring and remediation of toxic flammable gases have become a critical task for the development clean society. Among various types metal oxide semiconductors (MOS), zinc (ZnO) is considered potential material gas sensing application because its high sensitivity, easy synthesis, thermal stability behaviours. This research aimed to gain an in-depth understanding very stable porous thin film spin coated ZnO detecting ammonia vapour at room temperature. As-prepared films were characterised...
The physical phenomena of convective flow Cross fluid containing carboxymethyl cellulose water over a stretching sheet with heating were studied. nanofluid Al 2 O 3 , Cu nanoparticles, and based CMC is used. Entropy generation minimization examined in the current analysis. system PDEs altered into set ODEs through suitable conversion. Further, these equations are computed numerically MATLAB BVP4c technique. behavior governing parameters on velocity, temperature, entropy generation, Bejan...
This paper compared the effects of A. indica plant proteins over chemical methods in morphology zinc oxide nanoparticles (ZnO NPs) prepared by a co-precipitation method, and ethanol sensing performance thin films deposited fluorene-doped tin (FTO) bind glass substrate using spray pyrolysis technique. The average crystallite sizes diameters grain-sized cluster ZnO NPs were 25 (701.79 ± 176.21) nm for an undoped sample 20 (489.99 112.96) india dye-doped sample. fourier transform infrared...
The primary heat source from the sunlight is solar energy, which used in photovoltaic panels, power plates, streetlights, and solar-based hybrid nanocomposites. A nanofluid traversing an expanding sheet this investigation. Maxwell fluid stream with two nanoparticles going towards a trough parabolic form situated within aircraft wing to investigate phenomena of transfer rate. term thermal radiation was introduced describe occurrence. effectiveness transmission airplane wings assessed by...
In this exploration, we decided to investigate the significance of prescribed thermal conditions on unsteady 3D dynamics water‐based radiative hybrid nanofluid with impact cylindrical‐shaped nanosized particles (alumina (Al 2 O 3 ) and titania (TiO )). For physical relevancy, Lorentz force is also included. The combination suitable variables has been used transform transport equations into system ordinary differential then numerically solved via Keller‐Box approach. Graphical illustrations...
The consequence of periodic body acceleration and thermal radiation in the pulsating flow MHD Casson nanofluid through a porous channel is addressed. A injected lower plate considered while sucked out upper with similar velocity. term incorporated heat transfer equation. governing equations corresponding to velocity temperature are converted from partial differential system ordinary by employing similarity variables. perturbation technique applied solve equations. impact diverse parameters...
Usnic acid contents in acetone extracts of 31 samples lichen Parmelia flexilis collected from different altitudes were identified using thin layer chromatography (TLC) and determined by high performance liquid (HPLC). The usnic content varied between highest 5.13% to lowest 1.66% oven dried (80 °C) samples. species lower all show levels acid. negative relationship altitude was obtained. Statistically, it is revealed that there a significant difference average percentages with varying (p <...
Abstract In recent times, the importance of nanostructure metal oxide semiconductor (MOS) as a gas sensing material is rising tremendously. Among various semiconductors ZnO has potential to be used sensor for several toxic gases. this work, we investigated influence Fe doping into detect concentrations ethanol vapour. Pristine and doped (Fe-ZnO) films were deposited on glass substrates using spin coating technique wherein concentration can easily controlled. The crystallite size surface...
This analysis examines the flow of Sutterby nanofluid having bioconvection due to a stretching sheet and heated convective boundary condition. The heat sink/source was imposed in terms energy equation. entropy minimization is also considered. Through appropriate transformation system nonlinear PDE’s setting, existing problem has altered into ODEs then numerically utilized via bvp4c method. numerical values skin friction, Nusselt number, Sherwood motile density profiles are revealed tabular...
The effect of various parameters in the unsteady pulsating flow radiative hydromagnetic Casson nanofluid through a porous channel is investigated. governing equations were nondimensionalized by applying suitable transformations. perturbation technique was employed to solve resulting similarity equations. velocity and temperature fields are illustrated for several pertinent parameters. fluid has been enhancing higher values frequency parameter, nanoparticle volume fraction, Darcy number....
This article reports the effects of natural plant proteins on morphology zinc oxide nanoparticles (ZnONPs) prepared via a precipitation method. Green synthesised ZnONPs have wide range uses such as biomedical applications, water purification, optical devices and gas sensors. The non-toxic economical technique described in this is favourable for large-scale production too. were produced from acetate precursor with dye extract Ixora Coccinea (IC) leaves capping agent. as-prepared characterised...
The present investigation is made to study the effects of Hall current, thermal radiation and other parameters on an unsteady free convection flow incompressible, viscous fluid through a porous medium in rotating system. plate moves with constant velocity U0 its own plane. A perturbation technique used obtain solutions velocity, temperature concentration. Expressions for skin friction, Nusselt number Sherwood are also derived. It observed that as we increase hall parameter (m), rises. Also...
Coppers play crucial roles in the maintenance homeostasis living species. Approximately 20 enzyme families of eukaryotes and prokaryotes are known to utilize copper atoms for catalytic activities. However, small-molecule inhibitors directly targeting centers rare, except those that act against tyrosinase dopamine-β-hydroxylase (DBH). This study tested whether can inhibit copper-containing enzymes, ceruloplasmin, DBH, laccase. While most small molecules minimally reduced activities...
This study investigates the domination, double and regular domination in intuitionistic fuzzy hypergraph (IFHG), which has enormous application computer science, networking, chemical, biological engineering. Few properties of IFHG are established. Furthermore, definitions complement independent set given. The relation between an its was discussed. Moreover, illustrated by determining containment zones for epidemic situations like COVID‐19.
Among the various nanomaterials, Zinc Oxide (ZnO) has recently attracted attention of researchers due to its potential application in fields such as solar cells, bio-sensors, optoelectronic devices, gas sensors, water purification, piezoelectric and liquid crystal displays. The accurate knowledge optical structural properties ZnO film is important for fabrication high-quality devices. In this work, 0.2M thin was prepared by economic spin coating technique. Swanepoel method employed determine...
Abstract This study investigates the gas sensing capabilities of ZnO and Fe-doped films prepared via a cost-effective spin coating method. The were characterized optically, structurally, morphologically. X-ray diffraction revealed good crystal quality with polycrystalline nature, wurzite structure, though crystallite size decreased Fe doping. Optical measurements indicated an increased optical band gap from 3.205 ± 0.002 to 3.220 eV after Scanning electron microscope images confirmed...