bluuebunny/crossref_metadata_2025 huggingface dataset:
Circularly polarized RF coil for energy harvesting in clinical MRI
Authors: Seregin P.S. , Burmistrov O.I. , Solomakha G. , Kretov E.I. , Olekhno N.A. , Slobozhanyuk A.
Published: November 2021

Radiofrequency (RF) harvesting is a promising technology for the wireless power supply of various in-bore devices used in magnetic resonance imaging. However, current technical solutions in this area are based on the conversion of linearly polarized RF fields, and thus their efficiency is limited, as they interact only with a fraction of circularly polarized RF fields. In the present work, we introduce and experimentally realize a novel harvesting setup allowing for converting circularly polarized RF fields to direct current.
Generalized Kerker effect in dielectric antennas for enhanced backscattering modulation
Authors: Shakirova Diana , Dobrykh Dmitry , Krasikov Sergey , Mikhailovskaya Anna , Yusupov Ildar , Slobozhanyuk Alexey , Ladutenko Konstantin , Filonov Dmitry , Bogdanov Andrey , Ginzburg Pavel
Published: November 2021

Enhancement of electromagnetic signal modulation is one of the key problems for modern contactless communication systems. Using resonance effects allows to achieve significant interaction between an electromagnetic wave and matter of an antenna, providing opportunity to control scattering. This work demonstrates efficiency of multipole engineering based on Mie theory for dielectric core-shell antennas, particularly we show that generalized Kerker effect is a useful tool for backscattering modulation magnification. Our approach allows to manipulate scattering properties of devices without increasing their size by using all-dieletric concept.
Scattering spectra of dielectric ring: microwave experiments
Authors: Solodovchenko Nikolay , Sidorenko Mikhail
Published: November 2021

In recent years, dielectric ring resonators (RRs) have become an essential part of integrated optical circuits. This determines the growing interest in the study of the fundamental electromagnetic properties of these objects, which is far from complete. In particular, in the literature it is difficult to find information about light scattering spectrum, which should demonstrate a strong resonance character when the probe wavelength is comparable to the geometric dimensions of the RR, taking into account its dielectric constant. In this work, we present the results of an experimental study of the electromagnetic properties of a dielectric RR in the microwave range of the spectrum. The results of numerical calculations of the scattering spectrum are also presented, which demonstrate excellent agreement with the experimental data. In addition to the expected resonance character of the spectrum, we report the effects of strong light confinement, which are associated with Fano resonances between the eigenmodes and the component of the electromagnetic field scattered by the ring.
Resonant light scattering from dielectric ring of rectangular cross section
Authors: Solodovchenko N S , Seidov T Z , Samusev K B , Limonov M F
Published: November 2021

In this paper we present the results of numerical calculations of electromagnetic properties for cylindrical ring resonators (RRs) with rectangular cross-section and a dielectric permittivity corresponding to silicon ε = 12. The calculation of the scattering spectrum (Radar Cross Section) and the field distribution of the modes were performed at in-plane polarized light excitation. The presence of four side walls in the RRs determines a richer spectrum of eigenmodes in comparison with cylindrical whispering gallery modes of disk resonators and creates more possibilities and diversity for their practical applications.
Active narrowband filter based on 2.5D metasurface from Ge2Sb2Te5
Authors: Solomonov A I , Kushchenko O M , Yavsin D A , Rybin M V , Sinelnik A D
Published: November 2021

We propose a new concept of an active narrowband filter based on a 2.5D metasurface from Ge2Sb2Te5 (GST). In this paper, we present a numerical calculation of the transmission spectrum from a structure of ellipsoids of revolution. For this 2.5D metasurface, modulation of narrow peaks in the IR range for s- and p-polarization is shown. A manufacturing technique using two-photon lithography and laser electrodispersion is proposed.
Fabrication and characterization of aluminum, gold-tin and titanium-tungsten alloys for mid-infrared plasmonic applications
Authors: Spettel J , Stocker G , Dao T D , Jannesari R , Tortschanoff A , Saeidi P , Pühringer G , Dubois F , Fleury C , Consani C , Grille T , Aschauer E , Moridi M , Jakoby B
Published: November 2021

We numerically and experimentally investigate aluminum metal (Al), gold-tin (AuSn) and titanium-tungsten (TiW) metallic alloys as plasmonic materials in the mid-infrared (MIR) region using spectroscopic ellipsometry and reflection measurements of gratings. The angle dependence of the specular reflectance of shallow gratings is investigated using a free-beam measurement setup and compared to simulations. It is shown that the deep and narrow resonances observed for all three materials match the associated prediction from simulations.
Water-stable halide perovskite nanocrystals in biological environment
Authors: Talianov Pavel M. , Peltek Oleksii O. , Masharin Mikhail A. , Khubezhov Soslan , Baranov Mikhail A. , Drabavičius Audrius , Timin Alexander S. , Zelenkov Lev E. , Pushkarev Anatoly P. , Makarov Sergey V. , Zyuzin Mikhail V.
Published: November 2021

Tetramethyl orthosilicate and triethoxyphenylsilane, which contains hydrophobic phenyl groups, were used as a silica (SiO2) source in a modified ligand-assisted reprecipitation synthesis approach for the fabrication of water-stable perovskite nanocrystals. Hydrolysis-condensation reaction of tetramethyl orthosilicate and triethoxyphenylsilane results in a formation of 3D siloxane network. Employing triethoxyphenylsilane in the synthesis enhances the hydrophobic properties of the SiO2 shell, which increases the stability of perovskites in aqueous medium. The stability of the CsPbBr3@SiO2 nanocrystals was estimated after 24 h of water exposure by the photoluminescence measurements at different time points. The synthesized CsPbBr3@SiO2 nanocrystals were visualized during in vitro experiments with murine melanoma B16-F10 cells. Hence, the potential of CsPbBr@SiO2 nanocrystals for bioimaging purposes was observed.
Total angular momenta quantization of dielectric sphere modes
Authors: Toftul Ivan , Frizyuk Kristina , Petrov Mihail
Published: November 2021

Spherical particles both dielectric and metallic are essential building blocks in nanophotonics. During the recent rapid development of Mie-tronic — nanophotonics devices heavily using various features of the Mie-resonances — the deep fundamental investigation of the eigenmodes of such particles by using the novel tools is still relevant and currently important. Moreover, eigenmodes of a sphere are closely related to the Vector Spherical Harmonics (VSH) which are widely used in the multipolar decomposition to analyze less symmetric structures. In this work, we study in detail the canonical spin and angular momenta (AM), helicity, and other properties of the eigenmodes of dielectric (nondispersive) and metallic (dispersive) spheres. We show that the canonical momentum density of the AM is quantized and has a close relation to the quantum picture of a single photon. Our work provides a solid platform for future studies and applications of the AM transfer from near fields of spherical particles to the matter in its vicinity.
Control of spontaneous emission rate in lead halide perovskite film on hyperbolic metamaterial
Authors: Tonkaev Pavel , Makarov Sergey
Published: November 2021

Hyperbolic metamaterials represent a class of nanophotonic architectures with the possibility of controlling density of optical states. Due to this property, hyperbolic metamaterials can be employed as meta-electrodes in optoelectronic devices. On the other hand, lead halide perovskites have several promising properties for application in light-emitting devices. Moreover, a perovskite film is easily deposited on a hyperbolic metamaterial surface. Here, we theoretically show how to accelerate radiative recombination in a perovskite film with a hyperbolic metamaterial. This effect can be applied in light-emitting devices, where radiative recombination is extremely important.
Efficient Third Harmonic Generation with THz Graphene Metasurfaces
Authors: Tsilipakos O , Theodosi A , Soukoulis C M , Economou E N , Kafesaki M
Published: November 2021

We theoretically study graphene-based metasurfaces for efficient third-harmonic generation in the THz regime. The graphene sheet is judiciously patterned into patch and cross geometries, in order to support sharp metasurface resonances at the fundamental and third harmonic frequencies. The reported conversion efficiencies reach -19dB (1.2%).
Microwave realization of multiresonant metasurfaces for achromatic pulse delay
Authors: Tsilipakos Odysseas , Zhang Lei , Kafesaki Maria , Soukoulis Costas M. , Koschny Thomas
Published: November 2021

We propose a microwave realization of a metasurface that can delay broadband pulses without distortion in reflection. In order to obtain large and broadband pulse delay, we harness the synergetic phase delay of five sharply-resonant meta-atoms. More specifically, three electric-LC and two split ring resonators, supporting electric and magnetic dipole resonances, respectively, are combined in a subwavelength unit cell. The resonances are spectrally interleaved and specifically designed to provide a spectrally-constant reflection amplitude and group delay according to the prescription in [ACS Photonics 5, 1101, 2018]. The designed metasurface is electrically ultrathin (λ0/19), since it relies on resonant phase delay exclusively, instead of phase accumulation via propagation. We show delay of 700-MHz Gaussian pulses centred at 11 GHz by 1.9 ns, corresponding to approximately 21 carrier cycles. Our results highlight the practical potential of metasurfaces for broadband dispersion control applications.
Dissipative Kerr solitons at the edge state of the Su-Schrieffer—Heeger model
Authors: Tusnin A. K. , Tikan A. M. , Kippenberg T. J.
Published: November 2021

We investigate analytically and numerically dynamics of dissipative Kerr solitons (DKS) at the edge state of the Su-Schrieffer–Heeger model. We demonstrate that four-wave mixing processes can lead to the formation of DKSs in the edge state of the resonator chain which subsequently initiates photon transfer to the bulk states. We discuss how the edge state soliton can be stabilized by limiting its width within the band gap. Our results contribute to advanced dispersion engineering via mode hybridization in chains of resonators — one of promising ways to achieve broadband frequency combs generation on chip.
Light focusing by silicon nanosphere structures under conditions of magnetic dipole and quadrupole resonances
Authors: Ustimenko N , Baryshnikova K V , Melnikov R , Kornovan D , Ulyantsev V , Evlyukhin A B
Published: November 2021

Metalens is a planar device for light focusing. In this work, we design and optimize c-Si nanosphere metalenses working on the magnetic dipole and quadrupole resonances of the c-Si nanoparticle. Resonant optical response of c-Si nanostructures is simulated by the multipole decomposition method along with the zero-order Born approximation. Limitations of this approach are investigated. The obtained results of optimization are verified by simulation via the T-matrix method.
Application of Born series for modeling of Mie-resonant nanostructures
Authors: Ustimenko N , Kornovan D , Baryshnikova K V , Evlyukhin A B , Petrov M
Published: November 2021

Born series formalism is a widely-used approach to solve a scattering problem in quantum mechanics and optics, including a problem of electromagnetic scattering on the ensembles of Mie-resonant nanoparticles. In the latter case, the Born series formalism can be used when the electromagnetic coupling between nanoparticles is weak. This can be violated near the multipole Mie-resonance of the nanoparticle. In this work, we analyze the applicability of the Born series approach for modeling the resonant optical response of Mie-nanoparticle ensembles and formulate quantitative criteria of Born series convergence and, subsequently, the applicability of this approach.
Laser-assisted formation of luminescent domains in metal- or semiconductor-doped silicate and phosphate glasses
Authors: Lipatiev A.S. , Shakhgildyan G.Yu. , Vetchinnikov M.P. , Lotarev S.V. , Sigaev V.N.
Published: November 2021

In this study, silicate and phosphate glasses doped with Ag or CdS were exposed to femtosecond laser pulses and photoluminescence properties of the laser-written domains were investigated. Laser writing in phosphate glass doped with CdS was found to induce very weak photoluminescence, while laser-written domains in silicate glass had a comparatively high photoluminescence intensity, that was assigned to the formation of the sulphur vacancies in the CdS nanocrystals precipitated under the ultrafast laser pulses. Observed photoluminescence bands in Ag-containing glasses we assigned to the formation of different silver nanospecies which provide photoluminescence bands with the maxima at 685 and 600 nm in Ag-doped silicate and phosphate glasses, respectively.
Open-source implementation of the discrete-dipole approximation for a scatterer in an absorbing host medium
Authors: Yurkin M A , Moskalensky A E
Published: November 2021

Theoretical description of light scattering by single particles is a well-developed field, but most of it applies to particles located in vacuum or non-absorbing host medium. Although the case of absorbing host medium has also been discussed in literature, a complete description and unambiguous definition of scattering quantities are still lacking. Similar situation is for simulation methods – some computer codes exist, but their choice is very limited, compared to the case of vacuum. Here we describe the extension of the popular open-source code ADDA to support the absorbing host medium. It is based on the discrete dipole approximation and is, thus, applicable to particles with arbitrary shape and internal structure. We performed test simulations for spheres and compared them with that using the Lorenz-Mie theory. Moreover, we developed a unified description of the energy budget for scattering by a particle in a weakly absorbing host medium, relating all existing local (expressed as volume integrals over scatterer volume) and far-field scattering quantities.
Temperature sensor tag based on supercavity mode of dielectric resonator
Authors: Yusupov Ildar , Filonov Dmitry , Ginzburg Pavel , Rybin Mikhail , Slobozhanyuk Alexey
Published: November 2021

This paper presents a wireless temperature sensor design based on the excitation of a high-Q supercavity mode in a dielectric resonator. Narrow resonance bandwidth improves sensor performance enabling accurate temperature measurements. The sensor consists of a half split ceramic cylinder attached to a metal sheet. The resonator parameters which lead to the excitation of a supercavity mode were obtained numerically. When the ambient temperature increased continuously from 23 to 120°C the notable shift of the resonant frequency was experimentally demonstrated.
Screening effect for excitonic spectrum of Coulomb coupling between two Dirac particles
Authors: Zalipaev V. , Kuidin V.
Published: November 2021

The properties of screening effect for energy spectrum of excitons in monolayer transition metal dichalcogenides are investigated using a multiband model. The excitonic hamiltonian in the product base of the Dirac single-particle is used. The corresponding energy eigenvalue system of the first order ODE (radial equations) was solved using the finite difference method. This enables to determine the energy eigenvalues of the discrete excitonic spectrum and the wave functions. We compare the results for the energy spectrum and the corresponding eigen-functions forms for WS
2 and WSe
2 computed for two different potentials: pure Coulomb and screened Coulomb (Keldysh potential). It is demonstrated that excitonic energy levels for unscreened potential lie dipper, and the corresponding eigen-functions’ forms differ from those obtained for screened one.
Second harmonic generation in hybrid GaP/Au nanocylinders
Authors: Pidgayko Dmitry , Deriy Ilya , Fedorov Vladimir , Mozharov Alexey , Mukhin Ivan , Zadiranov Yuriy , Petrov Mihail , Samusev Anton , Bogdanov Andrey
Published: November 2021

To date, nanoscale dielectric and plasmonic systems with a nonlinear response are of great interest to researchers. This is due to a wide range of their potential applications in nonlinear optical converters and optical communication systems. The fundamental problem of nanoscale frequency converters is the low efficiency of nonlinear optical generation. The reason for this is that the main mechanism for increasing the efficiency of nonlinear signal generation via phase matching is not available at scales smaller than the wavelength. Here, we experimentally investigate the generation of the second optical harmonic in hybrid GaP/Au nanoparticles resonantly enhanced with plasmonic and Mie resonances. Using dark-field spectroscopy, it is shown that nanoantennas support a series of optical resonances in the visible range, the spectral position of which is in good agreement with the numerical simulation. We measured the second harmonic generation spectrum, with sharp resonances which is in accordance with linear scattering. Finally, the dependence of the second harmonic optical signal on the polarization is measured.
Characterization of Organic Compound Doped Inorganic Ammonium Phosphate: Crystal Formation and Opto-Electrical Properties
Authors: Jegatheesan A. , Rajasekaran E.
Published: November 2021

The opto-electrical properties of mixing organic compound with inorganic material is the subject matter of electronic industry. Nonlinear active single crystals of amino acid doped ammonium phosphate was characterised using various experimental techniques. Specifically alanine was doped with inorganic material and characterised in terms of carbon role in structure formation and related properties. The structural and electrical properties are studied by analysing absorption, transmission, hardness and conductivity of the doped one. The structure and electrical framework are well suited with expected values of pure inorganic one. Otherwise the organic one mixed with inorganic one does changes these properties remarkably which are essential for application in modern livelihood of human nature. The single crystal obtained from doping of organic one with the properties of inorganic material proves to be suitable for robo one to walk away with newer developments. It promises a newer way of developing crystals with good mechanical strength, flexible and all kinds of opto-electrical properties. Interestingly the modern electronic appliances will greatly benefit from this development of organic one to the inorganic one.
Analysis of the thermoluminescent of borate glass by computerized glow curve deconvolution in kinetic formalism
Authors: Nabadwip Singh S.
Published: November 2021

Borate based phosphor is a suitable material for thermoluminescence dosimetry. Glow curves of β-irradiated pure borate glass has been analyzed by restoring to Computerized Glow Curve Deconvolution (CGCD) technique and evaluate the trapping parameters namely activation energy (E), frequency factor (s) and order of kinetics (b). It is observed that there are stable peaks in the range 110° to 150°C even to various extent of thermal cleaned ones also. The activation energies of the phosphor are in the range 0.898 to 1.325 eV and frequency factors are in the order of 1011 to 1013 s−1.
Predicting the peak structural displacement preventing pounding of buildings during earthquakes
Authors: Khatami S M , Naderpour H , Mortezaei A , Tafreshi S T. , Jakubczyk-Gałczyńska A , Jankowski R
Published: November 2021

The aim of the present paper is to verify the effectiveness of the artificial neural network (ANN) in predicting the peak lateral displacement of multi-story building during earthquakes, based on the peak ground acceleration (PGA) and building parameters. For the purpose of the study, the lumped-mass multi-degree-of-freedom structural model and different earthquake records have been considered. Firstly, values of stories mass and stories stiffness have been selected and building vibration period has been automatically calculated. The ANN algorithm has been used to determine the limitation of the peak lateral displacement of the multi-story building with different properties (height of stories, number of stories, mass of stories, stiffness of stories and building vibration period) exposed to earthquakes with various PGA. Then, the investigation has been focused on critical distance between two adjacent buildings so as to prevent their pounding during earthquakes. The proposed ANN has logically predicted the limitation of the peak lateral displacement for the five-story building with different properties. The results of the study clearly indicate that the algorithm is also capable to properly predict the peak lateral dis-placements for two buildings so as to prevent their pounding under different earthquakes. Subsequently, calculation of critical distance can also be optimized to save the land and provide the safety space between two adjacent buildings prone to seismic excitations.
On exponential Diophantine equation 17x+83y= z2and 29x+71y= z2
Authors: Paisal Komon , Chayapham Pailin
Published: November 2021

This Diophantine is an equation that many researchers are interested in and studied in many form such 3x+5y· 7z= u2, (x+1)k+ (x+2)k+ … + (2x)k= ynand kax+ lby= cz. The extensively studied form is ax+ by= cz. In this paper we show that the Diophantine equations 17x+83y= z2and 29x+71y= z2has a unique non – negative integer solution (x, y, z) = (1,1,10)
Effect of electrical poling on the structural, dielectric and photoluminescence properties of small concentration of Ho+3 substituted NBT
Authors: Kumar Abhinav , Katta Venkata Seshaiah , Kumar Raavi Sai Santosh , Asthana Saket
Published: November 2021

The effect of electrical poling on the room temperature structural, dielectric and photoluminescence properties of small concentration (i.e. 0.5 mole%) of Ho+3 substituted sodium bismuth titanate ferroelectric material (Na0.5Bi0.495Ho0.005TiO3 abbreviated as NBT-0.5Ho) has been investigated. Its crystal structure was found to be the mixture of two phases of rhombohedral (R3c) and monoclinic (Cc) in which monoclinic (Cc) coexisted as major phase. Comparative study of X-ray diffraction (XRD) patterns of electrically poled and unpoled specimens of NBT-0.5Ho revealed that electric field irreversibly transformed crystal structural of dominant Cc (≈-94.05% phase fraction) phase to R3c (≈70.6% phase fraction) as major phase. Dielectric value and its dispersion with frequency were significantly decreased in poled specimen which is ascribed to electric field driven structural change. Two photoluminescence (PL) emissions at 655nm and 756nm were obtained in NBT-0.5Ho. PL intensity was considerably tuned in effect of electrical poling in term of quenching. Obtain quenching is correlated with induced structural ordering towards higher symmetry phase (R3c) in effect of electric poling which is confirmed from XRD analysis. Obtained additional functionality of photoluminescence in the NBT-0.5Ho ferroelectric material and its tuning in effect of electric field opens the possibility in the material for optoelectronic devices applications.
A New Technique for solving Picture Fuzzy Differential Equation
Authors: Dhivya J. , Meena K. , Saroja M.N.
Published: November 2021

Picture Fuzzy set (PFS) is an extension of fuzzy set (FS) and intuitionistic fuzzy set (IFS) that can model the uncertainty by integrating the concept of positive, negative and neutral membership degree of an element. In this paper, the solution of Picture Fuzzy ordinary differential equation of first order by means of picture fuzzy number is exemplified and intend to define the picture fuzzy number for (∝, δ, β)-cut. Finally, we illustrate the numerical example for drug distribution in human body for different drug levels is discussed for determining its effectiveness and practicality of the first order differential equation involving picture fuzzy numbers.
Effect of temperature on mixing behavior and stability of liquid Al-Fe alloys
Authors: Bhandari I B , Panthi N , Gaire S , Koirala Ishwar
Published: November 2021

A theoretical model based on the assumption of compound formation in binary liquid alloy has been used to investigate the thermodynamic properties (free energy of mixing, enthalpy of mixing and entropy of mixing), microscopic properties (concentration fluctuation in long wavelength limit and chemical short range order parameter), surface properties (surface tension and surface composition) and dynamic properties ( viscosity and diffusion coefficient). All the properties of Al2Fe binary melt have been measured using the same energy parameters configured for experimental values of free energy of mixing. The energy parameters are detected as independent of concentration, but depend on temperature. The findings are well consistent with the experimental standards.
Justification of the parameters of the blade working body of the plowshare that forms a longitudinal bollard among the rows of cotton
Authors: Murtazoev A.N. , Shodiyeva S.U.
Published: November 2021

In this article the coverage width of justification of the parameters of the blade working of the plowshare that forms a longitudinal bollard among the rows of cotton, the results of the theoretical research conducted on the determination of the depth of immersion in the soil, the direction of movement and the angle of installation relative to the bottom of the rut are presented. It is noted that In the process of work, the working body of the device with the agitator should have a coverage width of 26,1 CM, the depth of immersion in the soil is 14,8 CM, so that it can form a threshold with the maximum height without damaging the sprouts and their roots, the direction of movement and the mounting angles relative to the bottom of the rut should be between at least 55° and 27-29° respectively.
Structural analysis on the basis of effect of molybdenum on the Pr2O3 doped lead borate glasses series-II
Authors: Kolavekar Sangeeta B. , Ayachit N.H.
Published: November 2021

This paper explains the role of molybdenum on the structural analysis of the investigated rare earth ion Pr3+ doped, lead borate (75 PbO — [25 – (x+y)]B2O3—yMoO3—xPr2O3) glass matrix has been discussed using the relation between Tg and structural parameters like average cross-link density (

n
¯

c

), average stretching force constant (F) and the number of bonds per unit volume (nb). Densities, molar volume have been measured as a function of MoO3 content. Linear variation in density and in the molar volume has been observed and is credited to the role of MoO3 in the investigated glasses. Based on the properties like good stability and bond strength, investigated glasses possibly suitable for the design of optoelectronic devices.
Z Open Sets and Maps in Nano Bitopological Spaces
Authors: Arul Selvaraj X. , Balakrishna U.
Published: November 2021

In this paper, nano (Ji, Jj
)Z open sets, nano (Ji, Jj
)Z interior and nano (Ji, Jj
)Z closure are introduced in nano (Ji, Jj
) bitopological spaces. Moreover, nano (Ji, Jj
)Z-σk
continuous functions in nano (Ji, Jj
) bitopological spaces are introduced and some of their characteristics are derived.
Optimizing the Financial Management of Electronic Companies using Goal Programming Model
Authors: Hoe Lam Weng , Siew Lam Weng , Fun Lee Pei
Published: November 2021

The swift development and transformation of emerging technologies such as augmented reality, robotics, biometrics and 3D printing place varying degree of pressure to the electronic industry to play a trailblazing role in making the world a smarter place of living. The concept of smart city increases the demand for the upgrades and sophistication of electronic components. Shorter product life cycles of personal and commercial electronic products also keep the electronic companies in a never-ending loop for huge investments in materials, equipment and expertise. Electronic companies in Malaysia are still facing financial stress in their operations. Therefore, this paper aims to optimize the financial management of listed electronic companies, namely D&O, GTRONIC, UNISEM and VITROX with asset, liability, equity, earning, profit and optimum management item as the objectives using goal programming model. The benchmarks of all the goals are obtained by comparing the maximum and minimum values of the optimal values of these companies. The results of this study show that the goal programming model is able to generate the optimal solution for each company. Besides liability and earnings, all the goals have been attained by these companies upon analysis using goal programming. Possible refinement values particularly for liabilities for all the companies have been generated from this model to provide insights for these companies to benchmark for risk alleviation and strategic decision making.
Overview of methods in Oil spill technology
Authors: Singh Megha , Bharti Aashirwad , Kodavaty Jagadeeshwar
Published: November 2021

Over the decades oil spills have been the biggest threat to the aquatic life and to a nation’s economy. Many methods were suggested in the literature to remove the oil that is present on the surface of sea water after the spill. Hydrogel formation is one of the best technique that could be adopted to handle oil spills. Since the oil spill is a oil and water emulsion, formation of hydrogels with these emulsions could lead to the recovery of oil. The formation of hydrogels can be either physically crosslinking the polymer molecules or covalent bonding among the entangled polymer molecules. The methods of making the hydrogels conceivable to acquire surface hydrophobicity and oleophilicity. Hydrogel technology could be more cost effective and efficient in recovering the oil from the spill, eco-friendly and easy to use. It is proposed that the hydrogels could be potential candidates for handling the oil spills. The methods described in this review explains the various hydrogels that could be utilized for oil spill recovery.
Effect of Structural Changes on the Electrical Properties of Sol-gel derived Iron Doped Barium Titanate
Authors: Singh Devendra , Dixit Anju , Dobal Pramod S
Published: November 2021

BaTi1-xFexO3 compositions for x = 0.0 - 0.5 were successfully synthesized using solgel method and the structural, dielectric, ferroelectric, and ferromagnetic properties of these compositions were studied. X-Ray diffraction patterns revealed a tetragonal phase in x=0.0 composition which changed to the hexagonal phase in x = 0.4 and 0.5 compositions. The co-existence of tetragonal and hexagonal phases was observed in iron doped samples up to x= 0.3. The difference in ionic radii of Ti and Fe ions was responsible for changing c/a ratio. Average grain size was found gradually increasing with Fe content in these compositions and was also observed in SEM micrographs. The dielectric constant and tangent loss were found decreasing with Fe concentration. The values of remnant and saturation polarizations decreased whereas that of saturation magnetization increased with an increasing content of Fe in barium titanate.
Investigation of dielectric properties in tantalum doped AgNbO3 ceramic
Authors: Joshi A , Bhatt S C , Uniyal M , Kumar K
Published: November 2021

Dielectric materials developed from Tantalum (Ta) doped AgNbO3 (ATN) show excellent properties in variety of electronic technologies. In the temperature range of 70 to 400 °C, four major dielectric abnormalities were observed in ATN (x = 0.1) while in ATN (x = 0.2) the maxima of M1-M2 phase shift to low temperature value. ATN ceramics’ dielectric properties dominate temperature and electric field-based performance, which has a major effect on their properties. This study looked into the dielectric properties in ATN.
Overview and methods in Enhanced Oil Recovery
Authors: Khan Aashima , Saxena Shaivya , Baloni Srishti , Sharma Mudita , Kodavaty Jagadeeshwar
Published: November 2021

After the conventional oil recovery system, it was estimated that huge amount of oil reserves is still remaining un-extracted. Because of tremendous demand for oil and established facilities at the oil exploration sites after conventional recovery got significant attention. Since the oil is entrapped in the porous rock structure and is difficult to evacuate, focus was made on tertiary recovery of oils. Many methods have been suggested by various researchers with different techniques to mobilize the entrapped oil in the well. The classification of the techniques will give different methods of recovery. The rheology, surface tension, mobility ratio are the important parameters that were considered during the enhanced recovery. The review that is presented here gives the overall methods for recovery and various materials and important parameters to be considered for the enhanced oil recovery. A new substitute for the sand pack column is suggested to conduct the bench top experimental set up that would ease the work of flooding with alkaline, surfactant and polymers.
The structure of liquid aluminosilicate under AI2O3 content: simplexes and shell core analyses
Authors: Dung Mai Van , Dung Tran Thanh , Quynh Truong Duc , Tuan Nguyen Manh , Nam Tran Thanh , Yen Nguyen Van , Hue Hoang Van , Vinh Le The
Published: November 2021

The structural properties of xAl2O3(1-x)SiO2 liquid systems have been investi-gated by molecular dynamics simulation in a wide range of compositions, x = 0.05–0.7 at 3000 K. The structure of liquid aluminosilicate system is clarified by analyzing the simplex and shell-core. The simulated results showed that the liquid consists of a large quantity of void-simplex, O-simplex, T-simplex, and SC-particle. Our simulation reveals that the densification of the liquid is due to the fact that the number of large simplexes and the radii of simplexes and SC-particles decrease. Besides, results also indicated that the distribution of cations in the liquid is not uniform.
Stability and bifurcations of a discrete-time prey-predator system with constant prey refuge
Authors: George Maria Selvam A , Janagaraj R , Britto Jacob S , Vignesh D
Published: November 2021

In ecology, by refuge an organism attains protection from predation by hiding in an area where it is unreachable or cannot simply be found. In population dynamics, once refuges are available, both prey-predator populations are expressively greater and meaningfully extra species can be sustained in the region. This examine the stability of a discrete predator prey model incorporating with constant prey refuge. Existence results and the stability conditions of the system are analyzed by obtaining fixed points and Jacobian matrix. The chaotic behavior of the system is discussed with bifurcation diagrams. Numerical experiments are simulated for the better understanding of the qualitative behavior of the considered model.

Mathematics Subject Classification. [2010] : 37C25, 39A28, 39A30, 92D25.
Pythagorean Fuzzy Rough Connected Spaces
Authors: Revathi P , Radhamani R
Published: November 2021

In this paper Pythagorean fuzzy rough set and Pythagorean fuzzy rough topological spaces are defined for the connected space. Then, the properties of connectedness are discussed with examples.
Electrochemical Anodization and Characterization of Titanium Oxide Nanotubes for Photo Electrochemical Cells
Authors: Bhadra C U , Henry Raja D , Jonas Davidson D
Published: November 2021

Due to its multitude of applications, titanium oxide is one of the most coveted and most sought-after materials. The above experiment demonstrated that TiO2 nanotube arrays might be formed by electrochemical anodization of titanium foil. The 0.25 wt% ammonium fluoride (NH4F) was added to a solution of 99% ethylene glycol. Anodization is carried out at a constant DC voltage of 12V for 1 hour. Then, the annealing process is carried out for 1 hour at 4800C, which is known as an annealing. FE-SEM were utilized to evaluate the surface morphology of the nanotube arrays that were made. At the wavelength of 405 nm, sharply peaked photoluminescence intensity was observed, which corresponded tothe band gap energy (3.2 eV) of the anatase TiO2 phase. Since free excitations appear at 391 and 496 nm, and since oxygen vacancies are developed on the surface of titania nanotube arrays, it is reasonable to conclude that free excitations and oxygen vacancies are the causes of humps at 391 and 496 nm, and that they may also be present at 412 and 450 nm. FESEM results showed uniformly aligned TiO2 nanotube arrays with an inner diameter of 100 nm and a wall thickness of 50 nm
Theoretical assessment for the mixing properties of AlMg liquid alloys at 1073K
Authors: Ahmad Shayista , Sah M P , Chaudhary R P , Jha I S , Mandal J
Published: November 2021

The alloying behavior of AlMg alloy in the liquid form at 1073 K has been theoretically investigated in the framework of four-parameter model which is based on Maclaurin series. The analytical expressions for thermodynamic functions such as excess free mixing energy, free mixing energy, enthalpy of mixing and entropy of mixing and microscopic functions such as concentration fluctuations at the long wavelength limit and Warren-Cowley chemical short range order parameter have been derived. These expressions have been used to compute the excess Gibbs free energy of mixing, Gibbs free energy of mixing, activity, enthalpy(heat) of mixing, excess entropy of mixing, entropy of mixing, concentration fluctuations in long wavelength limit and Warren-Cowley short range order parameters of AlMg liquid alloys at 1073 K. The investigation shows the excellent concurrence between the experimental and theoretical measurements of the mixing properties of AlMg liquid alloys at 1073 K. Interaction parameters of energy depends on temperature.
Efficient degradation of picric acid using rGO-MnO2 hybrid nanocomposite under different light conditions
Authors: Usharani B , Manivannan V , Shanmugasundaram P
Published: November 2021

Picric acid is a very dangerous environmental pollutant generated from chemical and dye industries due to its high toxicity. Therefore, efforts have been made to develop techniques for the efficient degradation of picric acid. A novel rGO-MnO2 nanocomposite has been synthesized by chemical method for the degradation of picric acid in various light medium. The rGO-MnO2 nanocomposite was characterized by X-ray Photoelectron Spectroscopy (XPS), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), Energy dispersive X-ray (EDAX), Ultraviolet-visible (UV-Vis) and Scanning electron microscope (SEM). The synthesized, pure rGO, MnO2 and rGO-MnO2 nanocomposite catalyst have been studied for the activity of photocatalytic degradation against picric acid under different light sources such as UV light (254,365,390 nm), visible light and sunlight. It is found that rGO-MnO2 has achieved better performance compared to that of pure rGO, MnO2.
Synthesis of Transition Metal Dichalcogenides based hybrid nanostructures by thermal decomposition method
Authors: Baby Melbin , Rajeev Kumar K.
Published: November 2021

In this work, we report synthesis of hybrid nanostructures of Transition Metal Dichalcogenides via thermal decomposition method. Ammonium tetrathiomolybdate was used as not only growth templates but also as starting precursor for synthesis of hybrid nanostructures. The conditions for the synthesizing method were optimized using electron microscopy and x-ray diffraction. In this hybrid nanostructure synthesis, it was found that MoO3nanorods are interspersed on exfoliated MoS2nanosheets. The structural and optical properties of the hybrid nanostructure were investigated using transmission electron microscopy (TEM), Scanning electron microscopy (SEM), X-ray diffraction (XRD), Raman spectroscopy and Ultraviolet Visible spectrophotometry (UV-VIS). The hybrid nanostructure of MoO3on MoS2shows a band gap of 2.2 eV. It was also found that by tuning the preparation parameters viz temperature of heating and time of heating, the composition of the hybrid nanostructure can be varied.
Single crystal X-ray diffraction, Hirshfeld surface analysis and DFT studies of Bis(L-Serinium) oxalate dihydrate (BLSOD)
Authors: Ilakkiyaselvi S , Sinthiya A
Published: November 2021

Bis(L-serinium) oxalate dihydrate (BLSOD) crystals synthesized and structure derived from single crystal x-ray diffraction analysis and compared with early reported BLSOD. Compared to the reported structure the present structure has two new C-H…O hydrogen bonding. The hydrogen bonding interactions of O•••H (69.6%), H•••H (24%), C•••H (2.7%), C•••O (1.6%) and 0•••0 (2.1%), are derived from the Hirshfeld surface analysis. The grown crystals characterized by Fourier Transform Infrared (FTIR) and Ultraviolet (UV) spectrum. The optimized structure, HOMO-LUMO, NBO and NLO properties of BLSOD were calculated and compared with early reported BLSOD structure using B3LYP method with 6-31G basis set as provided with Gaussian 5.0 software. The DFT theoretical calculation indicates the new change in the bonding interaction improved the NLO property compared to early reported structure of BLSOD. This may be due to the change in the molecular orientation.
Analysis of Weed Growth in Rabi Crop Agriculture Using Deep Convolutional Neural Networks
Authors: Mishra Anand Muni , kaur Prabhjot , Shahare Yogesh , Gautam Vinay
Published: November 2021

Weed interference for the duration of crop establishment is a severe difficulty for wheat in North India [22.9734 ° N, 78.6569 ° E]. In situ far-flung detection for precision herbicide application minimizes the danger of both crop damage and herbicide input. This research paper focuses on the comparative study of crop growth and its effect at three different places in Madhya Pradesh [24.5840° N, 81.5020° E] India[20.5937° N, 78.9629° E]. These weed species included Pigweed (Amaranthaceae ), Goosefoot [Chenopodiaceae], Wild oat species (Poaceae), livid amaranth (Amaranthus blitum L.), Fathen[Chenopodiaceae (L.) Wild.], and Bermuda grass (Poaceae L.) a significant weed for rabi crop production in India with sensitivity to clopyralid, is the best available put up broadleaf herbicide. The intention of the Takes a look to assess the accuracy of four different CNNs architectures to locate the weed images of the Rabi crop of the family of various Rabi crops growing in competition with Rabi crops at 3 sites in Madhya Pradesh. Four CNNs have been compared, including object detection-primarily based ResNet-50, image classification-based VGGNet-16, Inception v4 and EfficientNet-B7 the EfficientNet-B7 networks have been trained to hit upon both leaves or canopies Everlasting of weeds. Image classification the use of ResNet-50 and VGGNet-16 was largely unsuccessful all through validation with whole pics (Fl-score < 0.04). CNN training elevated the usage of cropped photographs Eternal Broad Fall detection at some stage invalidation for VGGNet (F1-score = 0.77) and ResNet-50 (F1-Score = 0.62). The rabi crop weed leaf-trained inception V4 and EfficientNet-B7 achieved the highest F1-Score (0.94) and F1 Score (0.96) respectively, The aim of leaf-based EfficientNet-B7 extended false positives, even though such errors could be won over with extra training images for network desensitization training. Photograph-based faraway sensing rabi crop will become the most viable CNN test for weeds in competition with the EfficientNet-B7 crop.
Effect of parasitic resistances on CdTe solar cell and validation with datasheet of FS-6450A in Matlab/Simulink
Authors: Kar S , Banerjee S , Chanda C K
Published: November 2021

Cadmium telluride (CdTe) is the second popular choice after silicon for the solar cell in photovoltaic (PV) technology. Among the thin-film photovoltaic panels, CdTe reaches its first position to surpass crystalline silicon PV in cheapness and confined a large space in the PV market. Before constructing CdTe PV panels its operating characteristics should be properly judged. Any solar cell being related to a high level of nonlinearity, the model parameter is to be chosen judiciously. The operating characteristics can be well considered after the model circuit parameter comes accurately. In this paper operating characteristics of a thin-film CdTe solar module is shown with the variation of series and shunt resistance. Also considering parasitic resistances, the output characteristics of the solar cell varying climate condition is shown. Validation with FS-6450A PV module and all the simulation works are done in Matlab/Simulink environment. In the end, it is concluded with possible outcomes.
Basic simulation studies on 60 GHz wireless technology employing QAM modulation
Authors: Keerthana S , Indumathi G
Published: November 2021

The 60 GHz technology engage between 57 GHz to 66 GHz occupying an unlicensed band consisting of four channels with 2 GHz bandwidth each. The wavelength of such technology approximates 5 mm enabling milli-meter wave communication. It benefits transmission security for crucial data. Indoor networking equipment with large bandwidth and high-capacity streams lag free High-Definition video from tablet to television. This paper intends to present the simulation studies on 60 GHz mm-wave band technology employing QAM modulation for wireless applications. The experimental results were obtained by simulating the designed architecture in Agilent ADS software tool and further presented to deduce the insight of future Wi-Fi for wireless applications.
Novel RF energy harvesting using Rectenna
Authors: Purohit Nikhil , Rosaline Imaculate
Published: November 2021

In this paper an experimental RF energy harvester using rectifying antenna (rectenna) to harvest ambient energy from cellular device operating at 900 MHz GSM band is proposed. The circuit is a combination of antenna and rectifying circuit using Schottky barrier diode for microwave (RF) to DC conversion. The performance results of the rectenna shows radiation efficiency of around 58.81%, gain of 3.9 dB and directivity of 5.972 dBi. The proposed rectenna design can prove to be a low cost device for wireless power transmission and RF energy harvesting. The prototype is fabricated with simulated and measured results in good agreement, having a return loss of 21 dB at frequency of around 885 MHz. The overall efficiency is enhanced by using ISS351-TB-E Schottky diode which is categorized by a low junction capacitance and a low threshold voltage to achieve higher conversion efficiency.
Comparison of closed loop performance of consistency process dynamics for various PID controller algorithms
Authors: Juneja Pradeep Kumar , Sunori Sandeep Kumar , Sharma Abhinav , Sharma Anshu , Kumar Prabhat , Joshi Vikas , Raizada Rohit
Published: November 2021

In this work, various algorithms of PID (Proportional-Integral-Derivative) controllers such as series, parallel, series together with derivative filter and parallel together with derivative filter form are implemented for the comparative analysis of the closed loop responses of an important parameter in head box of a paper machine in a paper making process industry called consistency, which has FOPDT (First Order Plus Dead Time) dynamics. Also the comparison is made between the closed loop responses achieved from different values of derivative filter factor for non-ideal situations. The steady state and dynamic characteristics are analyzed and compared and important inferences are derived.