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Improved near‒infrared nonlinear optical properties of Sm3+ containing borate glasses: Effect of silver nanoparticles concentration
No full textEfficacy of silver nanoparticles on tuning the optical nonlinear characteristics of Sm3+ doped borate‒based glasses has been investigated comprehensively and the outcomes are provided. The nonlinear optical (NLO) attributes were retrieved using the Z‒scan technique under an ultrafast pulse excitation with the wavelength ranging from 700 nm to 1000 nm. Reverse saturable absorption (RSA), ascribed to two‒photon absorption, was realized in open aperture Z‒scan profiles whereas refraction nonlinearity of positive type due to the self‒focusing was observed in closed aperture Z‒scan data. Based on the Z‒scan results along with the figure of merit condition (higher than unity), it was identified that the silver nanoparticles embedded Sm3+ containing glass hosts are competing materials for NLO device applications to function in near‒infrared region.
K.KeshavamurthyaB.N.SwethabFatemah FarrajAl‒HarbicJagannathGdAljawhara H.Almuqrin
The new operational matrix of integration for the numerical solution of integro-differential equations via Hermite wavelet
No full textHermite wavelet method (HWM) is applied to approximate the solution of the integro-differential equations. The Hermite wavelet and operational matrix of integration are used to reduce the integro-differential equations into algebraic equations. The method is computationally attractive, and applications are demonstrated through illustrative examples. © 2021, The Author(s), under exclusive licence to Sociedad Española de Matemática Aplicada
Numerical solution for the (2+1) dimensional Sobolev and regularized long wave equations arise in fluid mechanics via wavelet technique
No full textThis article proposed an efficient numerical technique for the solution of (2+1) dimensional Sobolev and regularized long wave equations that arise in fluid mechanics using the Laguerre wavelet collocation method. Five examples are illustrated to inspect the proposed technique efficiency, and convergence analysis is discussed in terms of a theorem. Here, the Sobolev and regularized long wave equations are converted into a system of algebraic equations using the properties of Laguerre wavelet, and solutions obtained by the proposed scheme are more accurate, and they are compared with the analytical solution and other methods in the literature by calculating L2 and L∞ Errors. © 2020 The Author(s
Quantifcation of radon concentration in groundwater around abandoned Gogi uranium mineralized zone, Yadagir district, Karnataka, India
Full text linkRadon activity concentrations have been measured by analysing a total of 93 bore well water samples, geographically spread
over three taluks of Yadagir district. The analysis involved usage of Durridge’s RAD7 radon analyser equipment with RADH2O accessories by closed loop aeration concept. Having geometric mean concentrations of 37.0, 20.75 and 9.98 Bq/L,
radon concentration in 5.71, 14.29 and 6.67% groundwater samples from Yadagir (8.88 Bq/L<Rn<160 Bq/L), Shahapur
(1.98 Bq/L<Rn<591 Bq/L) and Surpur (0.586 Bq/L<Rn<206 Bq/L) taluks respectively exceeded the alternative maximum
contaminant level (AMCL) of the USEPA (148 Bq/L). Nearly 15% of the groundwater samples had radon concentrations
higher than WHO reference level of 100 Bq/L. The calculated total annual efective dose in 38.71, 44.09, and 55.92% of the
samples respectively for infants, children and adults was not in consistent with WHO recommended dose level of 100 µSv/y
Biosynthesis of Iron Oxide Nanoparticles Using Ethyl Acetate Extract of Chaetomium Cupreum and their Anticancer Activity
Full text linkBackground: The biosynthesis of iron oxide nanoparticle (NP) formation was carried out using ethyl acetate extract of fungus Chaetomium cupreum as reducing agents. The C. cupreum contains azaphilones pigments which poses various biological activities. Objectives: The synthesis of iron oxide NP and their anticancer potential was investigated. Materials and Methods: The anticancer activities of biosynthesized iron oxide NP were evaluated using tetrazolium bromide assay, measurement of reactive oxygen species (ROS), mitochondrial membrane potential (MMP), and inhibition of tumorsphere formation. Results: In the present study, the X-ray diffraction shows the presence of gamma phase iron oxide NP withe the type of Fe2O3. The anticancer potential of iron oxide NP was investigated against human breast cancer cell line. The anticancer activity of biosynthesized iron oxide NP against MCF-7 was 20.5, 30.5, 41.1, 55.3 67.5, and 75.25 at 50 μg/ml after 1, 5, 10, 15, 20, and 24 h of treatment, respectively. The results showed that Fe2O3NP induced ROS generation to 68.22% at the concentration of 25 μg/ml and 83.66% at 50 μg/ml as compared to 48.22 in control after 15 h of treatment. The results showed that Fe2O3NP treatment increased depolarization MMP to 8.52% at 25 μg/ml and 10.74% at 50 μg/ml as compared to 6.35% in untreated cells after 24 h. Thus, treatment with Fe2O3NPs showed significant inhibition of MCF-7 tumorsphere formation at higher concentration. Conclusion: The biosynthesized iron oxide NP using ethyl acetate extract of C. cupreum exhibit significant anticancer activity
Orientational Dynamics of Magnetotactic Bacteria in Earth's Magnetic Field—a Simulation Study
Full text linkWe investigate through simulations the phenomena of magnetoreception to enable an understanding of the minimum requirements of a fail-safe mechanism, operational at the cellular level, to sense a weak magnetic field at ambient temperature in a biologically active environment. To do this, we use magnetotactic bacteria (MTB) as our model system. The magnetic field sensing ability of these bacteria is due to the presence of magnetosomes, which are internal membrane-bound organelles that contain an iron-based magnetic mineral crystal. These magnetosomes are usually found arranged in a chain aligned with the long axis of the bacterial body. This arrangement yields an overall magnetic dipole moment to the bacterial cell. To simulate this orientation process, we set up a rotational Langevin stochastic differential equation and solve it repeatedly over appropriate time steps for isolated spherical shaped MTB as well as for a more realistic model of spheroidal MTB with flagella. The orientation process appears to depend on shape parameters with spheroidal MTB showing a slower response time compared to spherical MTB. Further, our simulation also reveals that the alignment to the external magnetic field is more robust for an MTB when compared to single magnetosome. For the simulation involving magnetosomes, we include an extra torque that arises from the twisting of an attachment tether and enhance the viscosity of the surrounding medium to mimic intracellular conditions in the governing Langevin equation. The response time of alignment is found to be substantially reduced when one includes a dipole interaction term with a neighboring magnetosome and the alignment becomes less robust with increase in inter dipole distance. The alignment process can thereby be said to be very sensitively dependent on the distance between magnetosomes. Simulating the process of alignment between two neighboring magnetosomes, both in the absence and presence of an ambient magnetic field, we conclude that alignment between these dipoles at the distances typical in an MTB is highly probable and it would be the locked unit that responds to changes in the external magnetic field
Numerical-Solution-For-Nonlinear-Klein–Gordon Equation via Operational-Matrix by Clique Polynomial of Complete Graphs
No full textThis study introduced a generalized operational matrix using Clique polynomials of a complete graph and proposed the latest approach to solve the non-linear Klein–Gordon (KG) equation. KG equations describe many real physical phenomena in fluid dynamics, electrical engineering, biogenetics, tribology. By using the properties of the operational-matrix, we transform-the non-linear KG equation into a system-of algebraic-equations. Unknown coefficients to be determined by Newton's method. The present-technique is applied-to four problems, and the obtained-results are-compared with-another-method in the literature. Also, we discussed some theorems on convergence analysis and continuous property
Canonical Concepts of Content Management – Prospects in Retrospect
No full textContent is the indispensable essence of information. In communication of information, content delivery in right format implies receivers' acceptance of the communication. The content creation precedes content development and management. One of the primary functions of LIS professionals has been in the vocation of content creation, development and its management since long time, and been the objective of its preservation for posterity. Documentation in early 1960s emerged as a technique in this regard and the LIS professional imbibed and practicing it, though with changes in its scope and innovative techniques. The growth of information exploded with varieties of forms of content which is conceived as one of the components of the ‘Document' which identified new functions “documentation work and service”. Since the invention of movable type of printing and to the advent of the Internet and WWW that has been extended to new formats – hypermedia and digital content, the function of content development and management has become part and parcel of LIS professionals. So in this paper, the author provides an account of generic view of content development and its management and the future prospects in store for the LIS professionals
ETPAC: ECC based trauma plight access control for healthcare Internet of Things
No full textHealthcare Industry experiences a rapid change in the traditional way of providing Medical Services to Patients with the revolution of the Internet of Things (IoT) and the Digitization of services. The Healthcare IoT (HIoT) provides Hospitals to render excellent services to Patients at an optimized cost. The Healthcare IoT must ensure not to disrupt or tamper with sensitive Medical Information of the Patient in addition to the continuous availability of data and services. The proposed framework is designed for secure emergency access to Patient data over Healthcare IoT. Normally, the Doctor obtains the Shared Key directly from the Patient to access the Medical data. In Trauma Plight, a Patient pre-shares an Attribute based Key with a set of Secondary Authority in Trauma Plight (SATP) and access permission to the Doctor for utilizing Emergency Key from SATP. The Doctor retrieves the medical record by using the Attribute