12 research outputs found
Antecedents of User Experience in the Immersive Metaverse Ecosystem: Insights from Mining User Reviews
No full textMetaverse, a digitally simulated immersive technology, has potential business value in enabling its users to execute their professional and recreational activities. It engages the users and helps them to serve their purposes. Few studies exist discussing metaverse as an immersive technology though there is a dearth of studies that empirically examine the factors associated with the corresponding user experience. We analysed over 400 thousand user reviews on 14 metaverse applications from Google Play Store to identify those factors associated with the corresponding user experience. We uncovered the pertinent factors with the help of a topic modelling technique and explained their associations with the help of Cognitive Load Theory (CLT) and Cognitive Absorption Theory (CAT) crafting a unified framework. Multiple regression models help us to validate the proposed framework. We find that sociability, density, telepresence, temporal dissociation, focused immersion, heightened enjoyment, curiosity, and playfulness positively influence the user experience of the virtual immersive space of the Metaverse. These insights can help policymakers and academicians take apt measures to make the Metaverse space more immersive and engrossing
Evaluation of postural, psychosocial stress and driver behaviour of motorbike riders in India
No full textIDENTIFICATION AND QUANTIFICATION OF STRESSORS AFFECTING MOTORIZED TWO WHEELER RIDERS: AN ERGONOMIC ATTEMPT
No full textMotorised two-wheelers are cost effective fuel-efficient system to manage occupational compulsions and time bound responsibilities but on the other hand they account for maximum traffic accident deaths. Bike riders are exposed to prolonged static posture causing significant angular deviations at all most all joints of the body as well as lumbar angle (L1-L5). All these postural alterations are contributory factors to stress and musculo-skeletal symptoms. Although the vibration remains within the OSHA limit, the vibration map and pain map of a two-wheeler rider’s were observed to have strong correlations. Varied emotional and psycho-social components contribute to cumulative stress among them. Bike riding also involves visual acuity, which alters critical flicker frequency of the riders indicating immense visual stress and subsequent adaptation. Proper stress management, ergonomic intervention in engineering revisions of the two wheeler design may contribute to reduce chances of accident and ensure safety, wellbeing and performance of the riders. Keywords
Quantification of Weight and Duration of Schoolbag Carriage Based on Socioeconomic Status and its Correlation with Magnitude of Pain among Urban Children of West Bengal, India
No full textSmart Prediction of Water Quality System for Aquaculture using Machine Learning Algorithms
No full textThis article focuses on the importance of the continuous collection of water parameters data from the sensors and also the prediction of water quality using the latest different Machine learning algorithms like Logistic Regression, Random Forest, Support Vector Machine, Decision Tree, K-nearest Neighbour, XGBoost, Gradient Boosting and Naive Bayes. These Machine learning models are implemented and tested to validate and achieve a satisfactory result of water quality prediction in terms of different attributes like pH, hardness, Solids, Chloramines, Sulfate, Conductivity, organic carbon, trihalomethanes, Turbidity and potability.</p
pH-regulated hydrothermal synthesis and characterization of Sb4O5X2 (X = Br/Cl) and its use for the dye degradation of methyl orange both with and without light illumination
No full textA pH-regulated hydrothermal synthesis method was employed to synthesize Sb4O5Br2 and Sb4O5Cl2 crystallites. Characterization is done by single crystal X-ray diffraction, powder X-ray diffraction, infra-red spectroscopy, scanning electron microscopy and DFT studies. The compounds crystallize in monoclinic symmetry with a P2(1)/c space group. Complete structural analysis of the Sb4O5Br2 compound by using single crystal X-ray diffraction data is performed for the first time and a comparative study with Sb4O5Cl2 is also discussed. The SEM study reveals that the surface morphology changes with the variation of pH for bromide compounds, whereas pH change does not affect the morphology of the chloride analogues. Electronic band structures of the synthesized oxyhalides were investigated in order to understand their catalytic effects in the dye degradation reactions in dark as well as sunlight conditions
Unraveling an Unusual Covalent C–Sb Bond Formation in a Co<sub>3</sub>Sb<sub>4</sub>CO<sub>6</sub>F<sub>6</sub> Pseudo-superstructure
No full textThe development of a novel transition metal carbon oxyfluoride,
Co3Sb4CO6F6, i.e., an
[M-L-C-O-F]-type compound, leads to the formation of a 2-fold ∼(√2a × √ 2b × c) pseudo-superstructure compared to the basic structure (a × b × c) of
Co3Sb4O6F6, i.e., an [M-L-O-F]-type
compound, and a unique C–Sb covalent bond has been revealed
for the first time. The covalent bond parameter, i.e., distance between
carbon and antimony, not only could be included in the directory of
the chemical bond in the bond valence sum (BVS) model of Brese and
O’Keeffe [Acta Crystallogr. B47, 1991, 192–197] but also can open up research
in inorganic chemistry. A single crystal of Co3Sb4CO6F6 has been obtained by employing a greener
hydrothermal synthetic technique, and table sugar (sucrose, C12H22O11) acted as the source of carbon
while incorporating into Co3Sb4O6F6, a transition metal oxyfluoride system comprising a
stereochemically active lone pair cation (Sb3+). The smallest
atomic radii of carbon were perfectly suited to occupy the tetrahedral
sites of the Sb4 pseudo tetrahedron in Co3Sb4O6F6 and generated distortion in the
structure, which resulted in lowering the symmetry to Fmm2 from I4̅3m. The participation
of one electron from the lone pair of antimony cation and one electron
from carbon led to the formation of a CSb4 covalent unit,
which is well supported by the electron localization function (ELF)
study. The DFT study also confirmed the lowering of the band gap energy
(Eg= 1.16 eV) in Co3Sb4CO6F6 compared to Co3Sb4O6F6 (Eg= 1.48 eV)
Development of the Sb<sub>4</sub>O<sub>5</sub>Cl<sub>2</sub>@NbSe<sub>2</sub> Composite: The Impact of 2H-NbSe<sub>2</sub> Nanoparticles on Sb<sub>4</sub>O<sub>5</sub>Cl<sub>2</sub> and Their Application for the Removal of Cr(VI)/Fe(III) and Methyl Orange from Wastewater
No full textA potential adsorbent, Sb4O5Cl2@NbSe2 composite, was generated
from the Sb4O5Cl2 photocatalyst and
5 wt % layered
2H-NbSe2 nanoparticles for the highly effective removal
of Cr(VI)
and Fe(III) ions and methyl orange (MO) from aqueous solution, and
a comparison was drawn against the precursors. Sb4O5Cl2 crystallites and NbSe2 nanoparticles
were synthesized hydrothermally, and the composite was prepared by
the incipient wetness impregnation technique. The crystal structure
of Sb4O5Cl2 was determined by single-crystal
X-ray diffraction (SCXRD) data. Powder X-ray diffraction (PXRD) study
revealed the 2H phase of NbSe2 nanoparticles. Field emission
scanning electron microscopy (FESEM) analysis confirmed the formation
of the spherical-shaped NbSe2 nanoparticles from rod-shaped
bulk 2H-NbSe2. Morphological changes from the hexagonal
to irregular prismatic shape were found upon the formation of the
Sb4O5Cl2@NbSe2 composite
compared to pure Sb4O5Cl2. Negative
ζ-potential values indicated that electrostatic interactions
were the predominant factor for the adsorption process. Sb4O5Cl2@NbSe2 provided removal efficiencies
of 99% for MO in 6 h, 96.52% for Cr(VI) within 2.5 h, and 92.43% for
Fe(III) within 4 h of 10 mg/L initial concentration. The maximum adsorption
capacities of the composite for MO, Fe(III), and Cr(VI) were found
to be 66.56, 131.48, and 122.30 mg/g, respectively, as calculated
using the Langmuir isotherm equation
Zn3Sb4O6F6 and KI-Doped Zn3Sb4O6F6: A Metal Oxyfluoride System for Photocatalytic Activity, Knoevenagel Condensation, and Bacterial Disinfection
No full textZn3Sb4O6F6 crystallites were synthesized by a pH-regulated hydrothermal synthetic approach, while doping on Zn3Sb4O6F6 by KI was performed by the ``incipient wetness impregnation technique.'' The effect of KI in Zn3Sb4O6F6 is found with the changes in morphology in the doped compound, i.e., needle -shaped particles with respect to the irregular cuboid and granular shaped in the pure compound. Closer inspection of the powder diffraction pattern of doped compounds also reveals the shifting of Braggs' peaks toward a lower angle and the difference in cell parameters compared to the pure compound. Both metal oxyfluoride comprising lone pair elements and their doped compounds have been successfully applied as photocatalysts for methylene blue dye degradation. Knoevenagel condensation reactions were performed using Zn3Sb4O6F6 as the catalyst and confirmed 99% yield even at 60 degrees C temperature under solvent-free conditions. Both pure and KI-doped compounds were tested against several standard bacterial strains, i.e., Enterobacter sp., Escherichia coli, Staphylococcus sp., Salmonella sp., Bacillus sp., Proteous sp., Pseudomonas sp., and Klebsiella sp. by the ``disk diffusion method'' and their antimicrobial activities were confirmed
Design, Synthesis Crystal Structure, and Thermal Studies of Ni0.779SbF3(SO4): A New Electrode Material for Electrochemical Supercapacitors
No full textA new transition-metal-based antimony fluoride sulfate
compound,
Ni0.779SbF3(SO4), has been studied,
which appears to be a promising candidate for an electrode material
in supercapacitor devices. The hydrothermal synthetic technique has
been employed for growing single crystals. The single-crystal X-ray
diffraction study reveals that it crystallizes in the orthorhombic
space group Cmce with unit cell parameters a = 15.1710 (3) Å, b = 7.1843 (11)
Å, and c = 11.070 (17) Å and Z = 8. The crystal structure consists of a [SbF3O2] polyhedron and a [SO4] tetrahedron along with cis- and trans- [NiO4F2] octahedrons of two different Ni atoms that result in negatively
charged [NiSbF3·SO4]n layers in the crystal structure, where each layer is made
up of chains of [Ni(1)O6F2]n, [Ni(2)O8F2]n, and [(SbF3)2(SO4)2]n4–. The partial occupancy on Ni sites resulted in the compound being
nonstoichiometric. The morphological analysis by both scanning electron
microscopy (SEM) and tunneling electron microscopy (TEM) reveals a
multilayer dense nanoflake-like morphology. Thermogravimetric analysis
(TG-DTA) shows that the compound has a high thermal stability with
a decomposition temperature above 450 °C. The density functional
theory (DFT) and density of states (DOS) are found to be commensurate
with the experimental results. The material shows good electrochemical
performance with a capacitance of 245 F g–1 at a
specific current density of 1 A g–1. Further, the
electrochemical impedance spectroscopy (EIS) study confirms the capacitive
nature of the electrode
