bluuebunny/crossref_metadata_2025_split huggingface dataset:
Synthesis of prolate gold nanoparticles for use in plasmon-enhanced overtone near-infrared spectroscopy
Authors: Sapunova A A , Dadadzhanov D R , Dubovik A Y , Baranov M A , Toropov N A , Vartanyan T A 
Published: November 2021

Abstract
Gold nanoparticles were obtained by the method of three-stage growth from a seed solution. Scanning electron microscopy images as well as comparison of extinction spectra to the results of numerical simulations prove the formation of prolate nanoparticles. Such particles with localized plasmon resonance in the NIR region are much-needed for the plasmon-enhanced overtone spectroscopy.
Polarized Raman spectroscopy of GaP nanowires under 5% elastic strain
Authors: Sharov Vladislav , Fedorov Vladimir , Alekseev Prokhor , Mukhin Ivan 
Published: November 2021

Abstract
Optical porperties of highly-strained gallium phosphide nanowires were investigated via polarized Raman spectroscopy. 5% elastic strain was created in individual nanowire lying on nickel substrate by the means of atomic force microscopy. Micro-Raman mapping along the nanowire cross section in parallel and perpendicular polarization was carried out. Strain-induced effects on transverse optical mode position and shape were analyzed. The pronounced splitting of the mode due to high level of strain was observed. It was found that in parallel polarization the mode shape is sensitive to the position of the pumping spot which can be attributed to enhanced light-nanowire coupling effects.
Strong light-matter coupling in topological metasurfaces integrated with transition metal dichalcogenides
Authors: Sinev Ivan , Li Mengyao , Benimetskiy Fedor , Ivanova Tatiana , Kiriushechkina Svetlana , Vakulenko Anton , Guddala Sriram , Krizhanovskii Dmitry , Samusev Anton , Khanikaev Alexander 
Published: November 2021

Abstract
Strong light-matter interactions enable unique nonlinear and quantum phenomena at moderate light intensities. Within the last years, polaritonic metasurfaces emerged as a viable candidate for realization of such regimes. In particular, planar photonic structures integrated with 2D excitonic materials, such as transition metal dichalcogenides (TMD), can support exciton polaritons – half-light half-matter quasiparticles. Here, we explore topological exciton polaritons which are formed in a suitably engineered all-dielectric topological photonic metasurface coupled to TMD monolayers. We experimentally demonstrate the transition of topological charge from photonic to polaritonic bands with the onset of strong coupling regime and confirm the presence of one-way spin-polarized edge topological polaritons. The proposed system constitutes a promising platform for photonic/solid-state interfaces for valleytronics and spintronics.
Laser induced tunable Ge2Sb2Te5 phase-change gratings
Authors: Trofimov Pavel I. , Bessonova Irina G. , Lazarenko Petr I. , Kirilenko Demid A. , Bert Nikolay A. , Kozyukhin Sergey A. , Sinev Ivan S. 
Published: November 2021

Abstract
Periodic photonic nano- and microstructures are routinely used for light manipulation at the nanoscale. However, their fabrication process is demanding in terms of time, cost and facilities. Here we demonstrate a rapid laser-assisted method for fabrication of gratings in Ge2Sb2Te5 (GST) thin films, based on the formation of laser induced periodic surface structures (LIPSS). LIPSS formation mechanisms dependent on the wavelength of the operating laser, lead to high flexibility of the process, producing gratings with tunable period and orientation with respect to the initial laser polarization. The phase-change properties of GST, on the other hand, allows to fabricate phase gratings with strong modulation of refractive index, which are rewritable in nature.
Tungsten disulfide nanoparticles produced by femtosecond laser ablation in water for nanophotonic applications
Authors: Tselikov G I , Popov A A , Ermolaev G A , Syuy A V , Kabashin A V , Arsenin A V , Volkov V S 
Published: November 2021

Abstract
We demonstrate nearly spherical nanoparticles of tungsten disulfide (WS2) produced by femtosecond pulsed laser ablation of bulk target in deionized water. Structural and optical analysis reveals that produced nanospheres preserve the crystalline structure, high refractive index and support strong excitons and Mie resonances in the spectral range 400-700 nm, resulting in enhanced photothermal response probed by Raman spectroscopy.
Comparison of angular-selective metasurfaces as tools for sub-THz single-frequency sensing
Authors: Tumashov M A , del Risco J P , Glybovski S B , Sayanskiy A D , Kuznetsov S A , Baena J D 
Published: November 2021

Abstract
We demonstrate and numerically characterize a set of single-layer metasurfaces based on capacitively-coupled bent metal strips deposited on a thin polypropylene film operating as band-stop filters at 139.1 GHz. Due to a high inter-digital coupling capacitance between neighboring inclusions formed by the strips, the resonance of the metasurface becomes highly sensitive to the incidence angle of a plane wave. At the same time, a narrow-band resonance is achieved by reducing the conductor length along the vertical polarization direction of the incident wave. We propose to use both properties for designing a sensor, which analyses the thickness of a thin slab of a known substance deposited over the structure by tracking the angle at which the minimum of transmission can be measured at a single frequency. We compare three versions of the proposed geometry by numerical calculation of the transmission coefficient depending on both the incidence angle and analyte slab’s thickness. We select the most suitable structure for sensing.
Problems of sub-THz astronomy, radars and telecommunications: development of equipment and methods
Authors: Bubnov Gregory , Gunbina Aleksandra , Kovalev Fedor , Lesnov Ilya , Mineev Kirill , Vdovichev Sergey , Vdovin Vyacheslav 
Published: November 2021

Abstract
Some original results of development methods and equipment for subterahertz astronomy, radars and telecommunications are presented in this paper. There are problems of extremely low sensitivity of receivers, high power transmitters, atmosphere propagation and development of key solid state components for this band: detectors arrays, cooling systems, antennas and so on.
Dielectric metasurface for emission control of magnetic dipole in the near-IR wavelength range
Authors: Yaroshenko Vitaly , Obramenko Marina , Larin Artem , Ageev Eduard , Zuev Dmitry 
Published: November 2021

Abstract
Developing active dielectric systems is in high demand due to growing the internet of things. Such systems can control the optical properties of nanoemitters which leads to an increase in the performance of the telecommunication networks. Here we numerically investigate metasurface consists of all-dielectric erbium-doped silicon nanocylinders. We demonstrate that such a structure can effectively control and enhance 320-folds spontaneous emission in the near-IR wavelength range. The results of this paper can be used for creating new telecommunication systems.
Dielectric nanoresonator for enhancement of 2D material photoluminescence
Authors: Yaroshenko Vitaly , Kustov Pavel , Zuev Dmitry 
Published: November 2021

Abstract
Nowadays the volume of transmitted information exponentially grows and requires the development of new telecommunication systems. Dielectric nanoresonators can be considered as a basic part of such systems to control the emission of the nanoscale source. Here we numerically investigated resonant dielectric nanoresonators for emission enhancements of 2D nanomaterials. We show that the radiative Purcell factor can achieve the value of up to 21 and 12 for the magnetic quadrupole and dipole responses, respectively. Also, we compare the directivity patterns for magnetic dipole and quadrupole resonances. The results obtained in this work can be applied in the development of optical chips and interfaces.
Neural network approach for faster optical properties predictions for different PCF designs
Authors: Kumar Hardik , Jain Tanya , Sharma Mritunjay , Kishor Kamal 
Published: November 2021

Abstract
Photonic Crystal Fibres (PCFs) are emerging as an alternative to standard fibres for applications in many disciplines like fibre lasers & amplifiers, imaging, spectroscopy and telecommunications. They have superior light guiding properties compared to ordinary Optical Fibres (OFs). This paper illustrates the potential of neural networks to efficiently and accurately compute the optical properties of PCFs including solid-core, hollow-core and multi-core designs. The proposed method takes a range of design parameters and wavelengths as input to predict PCF optical properties like effective index, effective mode area, confinement loss and dispersion desired for optimal specifications. The neural network approach is significantly better in terms of the low computational runtimes (~5 milli-sec) required for predicting the properties against the longer runtimes (~18 sec) required for similar calculations by traditional numerical methods.
Influence of trap densities in ITO thin film on the optical, electrical, and surface plasmon resonance properties
Authors: Arya K , Anjitha M , Sharika E , Nair Niveditha , Meenu M , Sanjeev Pooja , Babu Varsha T , Ram Sanjay K 
Published: November 2021

Abstract
Indium–tin–oxide (ITO) is a material having metallic behavior in the infra-red spectral range. Its electrical and optical properties are also easily tuned, making it a suitable alternative plasmonic material in the infra-red region. In this work, electrical and optical simulation modeling was performed to study the effect of trap densities in different carrier scattering mechanisms on the mobility in ITO. This study correlates the micro-structural and opto-electronic parameters to the surface plasmon resonance (SPR) behavior in the ITO thin films. The results indicate that low defect density with high carrier concentration can provide better SPR performance in ITO.
Bound states of a system of two bosons with a spherically potential on a lattice
Authors: Abdullaev J.I. , Ergashova Sh.H. , Shotemirov Y.S. 
Published: November 2021

Abstract
We consider a Hamiltonian of a system of two bosons on a three-dimensional lattice Z
3 with a spherically simmetric potential. The corresponding Schrödinger operator H(k) this system has four invariant subspaces L(123), L(1), L(2) and L(3). The Hamiltonian of this system has a unique bound state over each invariant subspace L(1), L(2) and L(3). The corresponding energy values of these bound states are calculated exactly.
A study on network analysis by navigation of robots using graphical measures to solve the complexity
Authors: Krishnan Athira , Manjusha R , Sunny Kuriakose A 
Published: November 2021

Abstract
In this paper, we present a graph theoretical analysis of a procedure for maintaining communication for tasks such as monitoring, identification, completion and productivity, where connectivity between the components involved in the task is required for conditional alertness. We present graphical measures and fuzzy theoretical tools to analyse the communication between the components in a network undergoing different tasks and accumulate a suitable information regarding the activities of the components by observing through sensor monitoring system. Also, we consider the efficiency of the robots in the monitoring system to control the position and orientation relative to other components to sustain communication links.
Surface Temperature Distribution Aluminum Block with Cone Tube Profile Calculated Using ANSYS Fluent
Authors: Sakti S P , Kusuma F J , Putro T , Abdurrouf  
Published: November 2021

Abstract
Thermal Cycler is the main part of the Polymerase Chain Reaction (PCR), which becoming a gold standard for Covid-19 diagnosis. The virus multiplication in an order to a detectable concentration is done by placing the virus solution at a deterministic temperature cycle. The solution is placed in a small tube inserted in a temperature block. Temperature distribution of the thermal block is important to make all the tube with sample treated at the same at desired target temperature. Study on the thermal block made of aluminium 7075 was simulated using fluid dynamic finite element method. Heating and colling to the target temperature was done by providing heat source and heat absorber. The temperature distribution on the surface was mapped. The temperature gradient perpendicular to the heat source was calculated. Assuming the environment of the thermal block was still air, the heating and cooling speed at given heat source and heat removal were calculated using the model. The temperature gradient from the top surface to the bottom surface is less than 2.5°C. The temperature difference among point at the surface is less than 0.1°C.
First principles band structure investigation of cubic spinel CuMn2Te4Compound for thermoelectric applications
Authors: Priyadharshini S , Sundareswari M , Viswanathan E 
Published: November 2021

AbstractSpinel CuMn2Te4material is investigated for its nonmagnetic and ferromagnetic phases by first principles calculation using the FP-LAPW method. Exchange and correlation are treated with GGA. T otal energy calculations reveal that CuMn2T e4compound tend to stabilise at ferromagnetic phase. Non vanishing bands at the Fermi Energy level illustrates the metallic nature of CuMn2Te4at both of its nonmagnetic and ferromagnetic phases. Transport properties are studied using the BoltzTraP code at 325K. Thermo power of -26.22μv/k is estimated for nonmagnetic CuMn2Te4. At ferromagnetic phase, these values are predicted as 84.85μv/kand 53.39μv/k respectively for spin-up and spin-down states. Computed power factor values are 2.29 x1014Wm-1s-1K-2for NM phase and 2.33×1017Wm−1s−1K−2/1.001×1010Wm−1s-−1K-−2respectivelyfor FM up-spin/down-spin phases. A total magnetic moment of 7.11003 μB/F.U. is obtained for the energetically favourable ferromagnetic phase of CuMn2Te4compound. High pressure investigations reveal the possibility of electronic topological transition that may lead to changes in the Fermi Surface topology and hence changes in the physical properties of nonmagnetic CuMn2Te4.
Thermal and Electrical Performance of AlGaAs/GaAs based HEMT device on SiC substrate
Authors: Iype Preethi Elizabeth , Suresh Babu V , Paul Geenu 
Published: November 2021

Abstract
In this paper investigation on electrical and thermal performance of the AlGaAs/GaAs HEMT device is carried out by comparing the device grown on substrates like 4H-SiC and Sapphire. The investigation was carried out based on Silvaco TCAD Atlas simulation. The DC characteristics of the device with varying ambient temperature were evaluated. A deterioration of drain current from 0.9 mA to 0.5 mA is observed as temperature rises from 300K to 500K on 4H-SiC substrate. The HEMT grown on 4H-SiC substrate has a high power dissipation, resulting in reduced temperature compared to sapphire substrate. This increases the lifetime of the device by 1000s of hours and also its overall performance. The HEMT proposed here is found to have an electrically and thermally optimal performance on 4H-SiC substrate than on sapphire
Studies on Structural, optical and Magnetic properties of Yttrium Aluminum Bromate (YAB) Nanomaterials, prepared at high annealing temperature
Authors: Bikramaditya Bibhuti , Singh Rakesh Kumar , Kumar Nishant , Verma Pushpendra Kumar 
Published: November 2021

Abstract
In this research, we present structural, photo-luminescence and magnetic properties of the Yttrium Aluminum Borate (YAB) nanomaterial, synthesized by low-cost Sol-gel method in high temperature range. X-ray diffraction (XRD) analysis, shows that crystal structure of YAB is of nanometric size ranging between 38 nm to 47 nm for the annealing temperature above 900°C. Photoluminescence property shows that YAB gives intense Blue light emission in the visible region. High-temperature annealing was found to increase the grain size and enhance the blue luminescence. Vibrating Sample Magnetometer (VSM) shows that coercivity increases while Magnetization and retentivity decreases for YAB nanomaterials for the temperature above 900 degree Celsius. Prepared YAB materials may be useful for LED or related devices.
On W0
and W2 ø-Symmetric Contact Manifold Admitting Quarter-Symmetric Metric Connection
Authors: Pradeep Kumar K. T. , Roopa B.M. , Arun Kumar K.H. 
Published: November 2021

Abstract
The paper deals locally W0 and W2
curvature tensor of ø-symmetric K-contact manifolds with quarter-symmetric metric connection and some results are obtained.
Sentiment analysis of Social Media Text-Emoticon Post with Machine learning Models Contribution Title
Authors: Jagadishwari V , Indulekha A , Raghu Kiran , Harshini P 
Published: November 2021

Abstract
Social Media is an arena in recent times for people to share their perspectives on a variety of topics. Most of the social interactions are through the Social Media. Though all the Online Social Networks allow users to express their views and opinions in many forms like audio, video, text etc, the most popular form of expression is text, Emoticons and Emojis. The work presented in this paper aims at detecting the sentiments expressed in the Social Media posts. The Machine Learning Models namely Bernoulli Bayes, Multinomial Bayes, Regression and SVM were implemented. All these models were trained and tested with Twitter Data sets. Users on Twitter express their opinions in the form of tweets with limited characters. Tweets also contain Emoticons and Emojis therefore Twitter data sets are best suited for the sentiment analysis. The effect of emoticons present in the tweet is also analyzed. The models are first trained only with the text and then they are trained with text and emoticon in the tweet. The performance of all the four models in both cases are tested and the results are presented in the paper.
The performance of flow field channel in direct methanol fuel cell
Authors: Sachin P V , Sathish Asha , Boopathi T S 
Published: November 2021

Abstract
A 3D computational fluid dynamics (CFD) model is developed to examine the impact of flow field design on the performance of direct methanol fuel cells (DMFCs). Effect of three various type flow fields is investigated in this study: single, double serpentine and honeycomb models. The distribution of velocity and temperature are simulated in 3D models. According to simulation studies, the honeycomb flow field has made uniform flow velocity distribution and minimum temperature change on plate surface. This could result better on DMFC performance. The experimental studies emphasize the performance of a single cell DMFC with different flow field channel designs as well as exhibit maximum power density and open circuit voltage. In subsequent study, electrodeposited Ni-Co alloy on stainless steel mesh surface is utilized to oxidize methanol and the electrode performance has been tested using cyclic voltammetry in alkaline conditions to replace expensive and sensitive platinum and platinum alloy catalysts
Stability of Atangana - Baleanu Fractional Order Differential Equation with Numerical Approximation
Authors: George Maria Selvam A. , Britto Jacob S. 
Published: November 2021

Abstract
The field of Fractional calculus is more useful to understand the real-world phenomena. In this article, a nonlinear fractional order differential equation with Atangana-Baleanu operator is considered for analysis. Sufficient conditions under which a solution exists and uniqueness are presented using Banach fixed-point theorem method. The well-established Adams-Bashforth numerical scheme is used to solve the system of equations. Stability conditions are presented in details. To corroborate the analytical results, an example is given with numerical simulation.
Mathematics Subject Classification [2010]: 26A33, 35B35, 65D25, 65L20.
Investigation of annealing temperature on the synthesis of zincite doped cobalt ferrite using Rietveld refinement
Authors: Bedi Himanshu , Rohilla Sunil , Chaudhary Nitika 
Published: November 2021

Abstract
Co-precipitation technique is used for preparing the composites of CoFe2O4/VZnO. The effect on the variation on the size of the crystals of CoFe2O4 is studied by varying the annealing temperature over the range from 500°C to 900°C. The structure of composite powder obtained after annealing was studied by Rietveld refinement and XRD. The estimation of the crystalline phases of the sample is done by XRD though Rietveld refinement. The space group and structure of zinc oxide was observed as P63mc(186) and hexagonal while that for the cobalt ferrite was Fd3m(227) and cubic. The values of all R factors was calculated and the effect of annealing temperature on the size of the crystal was discussed.
Iterated extended Kalman filter based state estimation of diode circuit
Authors: Gautam Amit Kumar , Majumdar Sudipta 
Published: November 2021

Abstract
This paper presents the state estimation of diode circuit using iterated extended Kalman filter (IEKF). The root mean square error (RMSE) based performance evaluation gives the superiority of the IEKF based estimation over extended Kalman filtering (EKF) based method.
Synthesis and characterization of ceria doped zinc ferrite nanopowdered crystallites
Authors: Kumar Narender , Rohilla Sunil , Gupta S.K. 
Published: November 2021

Abstract
In this paper, we have reported the synthesis of fine crystallites of ceria doped zinc ferrite by co-precipitation and an open air heat treatment method. X-ray diffraction (XRD) gave the data for structural analysis. The XRD data were refined by Rietveld refinement using FullProf suite software. The evolution of the crystalline phases has been analyzed. The effect of precursor concentration is reflected in the resulting diffractogram. Structural characterization revealed the cubic structure of zinc ferrite with a space group of FD-3m(227) and the cubic structure of CeO with a space group of fm-3m(225). Structural parameters such as the lattice constant of the direct lattice, the lattice constant of the reciprocating lattice, lattice strain, covalent bond angle, dislocation density, crystallite size and Wyckoff positions were calculated.
White light emitting dysprosium doped lanthanum oxalate single crystals
Authors: Vandana S , Joseph Cyriac 
Published: November 2021

Abstract
Single crystals of Lanthanum oxalate [La2 (C2O4)3]1OH2O and Dy3+ doped Lanthanum oxalate [La2-xDyx (C2O4)3]10H2O with x=0.1, 0.15, 0.2 were grown by gel method and characterised by X-ray powder diffraction analysis. Thermal stability of sample was investigated by thermo gravimetric analysis. UV-Visible absorption and photo-luminescent studies were also conducted. The emission spectrum on exciting at 271nm and 364 nm were recorded in which Dy3+ ions showed four emission bands at positions 458nm (blue), 478 nm (blue), 572 nm (yellow) and 655 nm (red) corresponding to transitions 4I15/2→ 6H15/2, 4F9/2→ 6H15/2, 4F9/2→ 6H13/2 and 4F9/2→ 6H11/2 respectively. The CIE coordinates, colour purity and CCT values were calculated, and all these parameters show that Dy3+ doped lanthanum oxalate single crystals are suitable candidates for white light emitting applications.