bluuebunny/crossref_metadata_2025_split huggingface dataset:
Finite Element Method to Solve Poisson’s Equation Using Curved Quadratic Triangular Elements
Authors: Shylaja G , Venkatesh B , Kesavulu Naidu V 
Published: December 2019

Abstract
The paper discusses the finite element method to solve Poisson’s equation using quadratic order curved triangular elements. We use quadratic order point transformation to solve the partial differential equation. We observe that with quadratic order as the discretization of the domain element is increased, the error of the solution decreases.
Radio Geometric graceful graphs
Authors: Meera K. N. 
Published: December 2019

Abstract
A one-one mapping f : V (G) → Z+ satisfying the condition

d
(
u
,
v
)
+

[

f
(
u
)
f
(
v
)

]

≥
d
i
a
m
(
G
)
+
1

, for every pair of distinct vertices in G is defined as radio geometric mean labeling of G. The maximum number assigned to any vertex of G under the labeling f is called its radio geometric mean number of f denoted rgmn
(f). The least value of rgmn
(f), taken over all such labelings f of G is defined as its radio geometric mean number and is denoted by rgmn
(G). Clearly, rgmn
(G) ≥ |V(G)|. Graphs for which rgmn
(G) = |V(G)| are defined as radio geometric graceful. In this paper, we find the radio geometric mean number of certain classes of graphs like sunflowers, Helms, gear graphs and show that they are radio geometric graceful.
Numerical Integration over arbitrary Tetrahedral Element by transforming into standard 1-Cube
Authors: Mamatha T M , Venkatesh B 
Published: December 2019

Abstract
In this paper, we are using two different transformations to transform the arbitrary linear tetrahedron element to a standard 1-Cube element and obtain the numerical integration formulas over arbitrary linear tetrahedron element implementing generalized Gaussian quadrature rules, with minimum computational time and cost. We also obtain the integral value of some functions with singularity over arbitrary linear tetrahedron region, without discretizing the tetrahedral region into P3 tetrahedral regions. It may be noted the computed results are converging faster than the numerical results in referred articles and are exact for up to 15 decimal values with minimum computational time. In a tetrahedral sub-atomic geometry, a focal particle is situated at the middle with four substituents that are situated at the sides of a tetrahedron. The bond edges are cos−1(−⅓) = 109.4712206…° ≈ 109.5° when each of the four substituents are the same, as in methane(CH4) and in addition its heavier analogs. The impeccably symmetrical tetrahedron has a place with point amass Td, yet most tetrahedral particles have brought down symmetry. Tetrahedral atoms can be chiral. Mathematically the problem is to evaluate the volume integral over an arbitrary tetrahedron transforming the triple integral over arbitrary linear tetrahedron into the integrals over a standard 1-cube using two different parametric transformations.
A Study on Steel Plate Shear Wall
Authors: Annapoorna B P , Boodihal Mohammed Ali 
Published: December 2019

Abstract
The main objective of this research study was to evaluate the parameters of stiffened and unstiffened steel plate shear wall under seismic loads. The scope of effort included simulating five unstiffened steel plate shear wall with varying thickness, three singly stiffened steel plate shear wall, and three doubly stiffened steel plate shear wall. The validation and simulation was done using software package ANSYS v16 using loads derived from ETABS. Overall, Unstiffened steel plate shear walls produced high in-plane and out of plane displacements which decreased with increase in thickness of plate; than singly stiffened followed by doubly stiffened steel plate shear walls. With introduction of stiffener in steel plate shear wall, the in-plane displacement values reduced by about 1%, and about 3% when doubly stiffened on the other hand the out of plane came down by 50% when stiffened singly and also when doubly stiffened. It was noteworthy that stiffener does not play any significant effect on any parameter except for out of plane displacement.
Effect of lanthanum zirconate thermal barrier coating on the performance and emissions of a diesel engine using biodiesel
Authors: Domakonda Vinay Kumar , Devendra Reddy P. , Farooq Shaik 
Published: December 2019

AbstractAn experimental Lanthanum Zirconate (La2Zr2O7) ceramic powder has been used as a thermal barrier coating material to study its effect on performance and exhaust emissions of a single cylinder diesel engine operated using diesel and biodiesel. Pongamia vegetable oil has been used to prepare biodiesel through transesterification process. Lanthanum doped thermal barrier coatings are found to be promising candidates for applications such as in diesel engines besides the conventional YSZ TBCs with lower thermal conductivity, high sintering resistance, low oxygen permeability and with catalytic activity. This experimental study has shown that the performance of the engine is improved significantly on the account of brake thermal efficiency and specific fuel consumption. Emissions, on the other hand are also improved, especially the smoke opacity which is significantly low at all Low Heat Rejection (LHR) operations.
Transient Analysis of a Blunt Body with Cylindrical Protrusion in Hypersonic Flow
Authors: Akshay N , Nagaraja S. R 
Published: December 2019

Abstract
Numerical analysis of a blunt body with protrusion in hypersonic flow having Mach number 8 is analysed using ANSYS-FLUENT. Transient analysis gives a better understanding of the flow field, separation of the flow from body, time taken for achieving steady state. 3D analysis has done. The variations of the pressure with respect to time at different locations on the body are obtained. The peak pressure at the separation point is 38% more than the steady state pressure. Pressure fluctuates inside the separation region.
Spectroscopic and Computational approach for the Structure - Property relationship of Hydantoin drug impurity : 1-methyl-5,5-diphenylimidazolidine-2, 4-dione
Authors: Anil Kumar S , Bhaskar BL 
Published: December 2019

Abstract
1-methyl-5,5-diphenylimidazolidine-2,4-dione (methyl phenytoin) is an intermediate impurity created en-route the commercial manufacture of epileptic drug phenytoin.Ab-initio computational modeling and spectrophotometric techniques are employed to examine molecular geometry and electronic structure to envisage possible structure-activity relationship in 1-methyl-5,5-diphenylimidazolidine-2,4-dione. Comparative studies show satisfactory consilience between theoretical and experimental approaches. According to DFT studies, the molecules are visualized to dimerize via hydrogen bonding. The two phenyl rings are not coplanar as evidenced by the dihedral angles between benzene rings and imidazole ring. The extent of intermolecular hydrogen bonding has been reduced due to methyl substitution at N1 and this assumes importance as anticonvulsant property is directly proportional to the extent of hydrogen bonding. A relatively high HOMO-LUMO energy gap of 5.9 eV implies good thermodynamical stability and a prospect of impurity being carried over during commercial drug manufacturing.Further, the presence of methyl substitution closer to the bio-toxic face opens up a prospect of title molecule being studied as an alternate drug with marked anti-epileptic action and less or no toxicity.
Analysis of heat transfer characteristics of nanofluid synthesized using green method
Authors: Vishnu Narayanan M , Rakesh S G 
Published: December 2019

Abstract
The use of additives in the base fluid is one of the techniques to strengthen the heat transfer with the amelioration in the field of nanotechnology. A new class of heat transfer fluids has been engineered, a base fluid (host) in which nano particles (guests) are dispersed and suspended stably. Researches have showed that these fluids exhibit higher thermal conductivity than the base fluid. As a result, the study of nanofluids has materialized as a new field of scientific interest and innovative application. The present work mainly focus es on the study of heat transfer characteristics and to analyze the thermal stability & other properties of nanofluid prepared by dispersing nanoparticles that are synthesized using green method. This work not only focuses on the heat transfer enhancement but also on the phenomena that are possible for this enhancement.
Study of the surfactants role in natural fibres reinforced composites for structural applications
Authors: Hallad Shankar A , Devangamath S A , Banapurmath N R , Hunashyal A M , Dhanalakshmi S , Ramadevi P 
Published: December 2019

Abstract
In this study, hemp fibres were used as reinforcements in polypropylene (PP) resin to form composite materials for structural applications. Adhesion between the fillers and holding matrix was enhanced using alkalisation, KMnO4treatments respectively on the fibre surface thus developed. Spectroscopic analysis such as Fourier transforms infrared (FTIR) and scanning electron microscope (SEM) was carried out to determine interferential adhesion and homogeneous distribution of fibres in the holding matrix. Based on the results obtained fibres treated with both NaOH and KMnO4 treatment showed better mechanical properties than the treatments done in isolation. Among the results obtained fibres specifically treated with specific co mposition of 5% NaOH an d 0.6% KMnO4 exh ibited better mechanical properties compared to those with treated and untreated fibre composite samples.
Bio-mediated Combustion Synthesis and Color Characteristic Studies of Y2O3:Tm3+ Nanoscale Superstructures
Authors: Venkatachalaiah KN , Nagabhushana H , Venkataravanappa M 
Published: December 2019

Abstract

Mimosa pudica(MP) plant extract was used to prepare Y2O3:Tm3+ (1-11mol %) nanoscale superstructure with nitrate source as precursors. The samples were characterized by advanced characterization techniques. The PXRD peaks indicates crystalline, no impurity peaks were present with body centre cubic structure of Y2O3. Photoluminescence emission spectra shows blue color emission at 358 nm excitation wavelength. The major peak of Tm3+ was at 453 nm and two very weak peaks were observed at ∼ 474 nm attributed to the transitions of 1D2 → 3 F4 and 1G4 → 3H6, res. The calculated color co-ordinates were matches to the NTSC blue color. Correlated color temperature was ∼ 4000 K. So the Y2O3:Tm3+ nanophosphor could be used for blue component in the warm WLED and SSL devices.
Synthesis and characterization of ecofriendly and large-area honeycomb-like Cu2ZnSnS4thin films for solar cell applications using chemical bath deposition method
Authors: Jirage Sandesh B. , Bhuse Vijaykumar M. 
Published: December 2019

AbstractIn view of care and concern for society to provide sustainable energy by renewable solar photovoltaic technology using various absorbers is being highly reliable. Among all absorbers, recently the Cu2ZnSnS4(CZTS) thin films have prompted the significant attention of researchers as low-cost and high-quality photovoltaic absorber semiconducting material owing to its high absorption coefficient, optimum band gap, nontoxic nature and naturally abundant elements with high expectations of greener synthesis and renewable solar to electrical conversion. Considering this eco-friendly approach we focus on synthesis, characterization and photo electrochemical application of Cu2ZnSnS4(CZTS) thin films by cost effective chemical bath deposition technique. The films were characterized using various techniques like XRD, scanning electron microscopy, optical absorbance, electrical conductivity, photoluminescence, and PEC studies. The investigation revealed a poly-crystalline, stable kasterite structure of CZTS thin films in a good stoichiometric and with a excellent uniform, large area typical honeycomb-like morphology.
Corrosion of stainless steels in acidic, neutral and alkaline saline media: Electrochemical and microscopic analysis
Authors: Seethammaraju Sahaja , Rangarajan Murali 
Published: December 2019

Abstract
This study presents how SS304 and SS316 corrode in saline media, including in the presence of acid and alkali, through an electrochemical and microscopic analysis. SS304 and SS316 samples were studied for their corrosion resistance in 1M NaCl, and in the presence of either 1M HCl or 1M NaOH. Potentiodynamic polarization studies were carried out to determine the corrosion potentials and currents. From the anodic polarization, regions corresponding to corrosion, passivation and transpassivation were identified. Samples were corroded at different anodic potentials corresponding to the different regimes and were analysed using scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDX). In 1M NaCl medium, SS304 exhibits pitting and passivation whereas SS316 does not. Transpassivation occurs through intergranular corrosion that connects the different pits. Making the medium acidic results in much higher corrosion rates for both SS304 and SS316, but the corroded surfaces bear vastly different structures. SS304 surface forms deep pits with large intergranular cracks resembling chimney stacks. However, SS316 surfaces show dendritic morphologies of deposited corrosion products, further evidenced by a higher O/Fe ratio in EDX measurements. In alkaline media, SS304 shows evidence of pits on whose edges corrosion products are deposited while no significant pitting is seen with SS316.
Dielectric Resonator Antenna on Ba TiO3 embedded with TiO2 Nano composite for Wi-Fi applications
Authors: Suhailrashid S , Sreekala C.O. , Menon Sreedevi K. 
Published: December 2019

Abstract
A cylindrical dielectric resonator antenna (DRA) energized using microstrip line for Wi-Fi applications is discussed in this paper. The cylindrical DRA of 14mm diameter and 2mm height are fabricated using titanium dioxide (TiO2) nanoparticle embedded in high dielectric constant barium titanate (BaTiO3) material. It is found that the BaTiO3: TiO2 composite is very effective as a radiator. The fabricated DRA radiates in Wi-Fi frequency of 5.5 GHz with good reflection and radiation performance.
Effect of Mixed Ions and Ion Irradiation on Ionic Conductivity of Solid Polymer Electrolytes
Authors: Manjunatha H , Damle R , Kumaraswamy GN 
Published: December 2019

Abstract
It is a well known fact that conductivity in case of solid polymer electrolytes (SPEs) is due to hopping of ions assisted by the segmental motion of polymer chains. It is observed that the ionic conductivity in SPEs increases with increase in the concentration of ions. After certain critical concentration the conductivity starts decreasing due to the formation of ion pairs. In this work, an attempt is made to identify the concentration at which ion pair formation occurs and hence improve conductivity by incorporating two different ions (salts) in the polymer matrix. SPEs with mixed conducting species PEOxLiBryNaBr with different concentration of salts have been prepared and investigated. Also an attempt is made to modify the crystalline phase of the host polymer by low energy ion beam (Oxygen ion, O+1 with energy 100 keV) irradiation. These observations place ion irradiation as an effective tool in improving ionic conductivity in SPEs. Using X-ray diffraction spectra and the temperature dependent conductivity studies of SPEs, the effect of mixed ions and ion irradiation on the ionic conductivity of SPEs is investigated and presented.
Virtual non-contact atomic force microscope
Authors: Mohammad Reza Bahrami , Suvorov Vladimir 
Published: December 2019

Abstract
In this paper, the virtual atomic force microscope (AFM) is constructed on the basis of the component models to simulate the conventional and high-speed AFMs. A room temperature conventional AFM with its standard control system is used as a reference. The virtual machine operates in non-contact mode (NC-AFM). The cantilever is oscillated at or near its natural frequency with the amplitude of l nm to 100 nm above the sample. The tip-sample interaction changes the amplitude, frequency, and phase of oscillation. In amplitude modulated-AFM (AM-AFM), by measuring the tip vibration and extracting its amplitude, the control system actuates the piezo-scanner to achieve the amplitude setpoint. By defining a proper cost function, here settling time, optimum gain parameters for the control system are obtained by the particle swarm optimization algorithm, PSO. Simulations are performed in two steps: when only the Z-directional movement of the XYZ stage is considered and when raster motion is considered. The performance of the new AFM is compared with a conventional AFM via simulations.
The results of the defect formation control in welded joints during friction stir welding by acoustic emission
Authors: Stepanova K , Kinzhagulov I , Iuferev R , Levkova Y , Kovalevich A 
Published: December 2019

Abstract
Experimental studies of the acoustic emission parameters distribution with structural changes in a welded joint during friction stir welding (FSW) are presented in this work. The parameters of energy, amplitude, activity and median frequency distribution of acoustic emission signals characterize the presence of features in the plasticization processes in case of disturbance of uniformity of plastic flow of a material during defect formation imitation process. An approach, based on the analysis of the parameters distribution of acoustic emission (AE), for the creation of an automated non-destructive quality control system of welded joints during FSW in real time has been proposed.
Simulation of aerodynamic wind protection of oil platforms workplaces
Authors: Yakovlev P.V. , Piskunov V.M. , Andreev V.V. 
Published: December 2019

Abstract
The paper presents the results of a study of the effectiveness of aerodynamic windproof devices. Considered various options for the placement of wind protection relative to the deck and simulated wind speed and air movement trajectory. As a result of the analysis of the velocity fields, the best layout options for wind-proof devices have been proposed.
Modeling the influence of geometric errors of vertical-milling machines on the accuracy of the complex of treated surfaces
Authors: Anikeeva O.V. , Ivakhnenko A.G. 
Published: December 2019

Abstract
The actual problem of modeling the influence of geometric errors of vertical milling machines on the accuracy of machined surfaces is considered in the paper. For the first time, a mathematical model of the accuracy of vertical milling machines is presented when processing a complex of keyway surfaces. The model was developed on the basis of a variational method for calculating the accuracy of metal-cutting systems, which is a development of the well-known variational method for calculating the accuracy of machine tools. The results of modeling the influence of geometrical errors of vertical milling machines on the accuracy of the machined surfaces of the keyway are given. Directions for further research of milling accuracy modeling with variable values of machine tool geometries are proposed. The work is useful for researchers engaged in research of the accuracy of technological equipment.
High-alumina slurry waste metallurgy aluminium alloys - complex modifier of heat-resistant and refractory composites
Authors: Khlystov A.I. , Vlasov A.V. , Shirokov V.A. , Vlasova E.M. 
Published: December 2019

Abstract
The effect of aluminate slimes on the thermomechanical properties of heat-resistant and refractory composites has been investigated. The optimal content of nanotechnogenic raw materials in the studied compositions was revealed. It has been established that the replacement of expensive refractory powders (alumina, chamotte) with high-alumina industrial waste in general has a positive effect on the durability of refractories. The chemical components of aluminate sludges and the principles of their action on refractory compositions in the area of critical operating temperatures are given. The decrease in the water-cement ratio allowed in mineral compositions based on hydraulic binders to form plastic structures with enhanced rheological characteristics. The mechanism of the proceeding processes in refractory materials on phosphate binder is clarified.
Research of the possibility of producing finely divided materials from natural raw materials for reactive powder concretes by mechanochemistry
Authors: Abramov M.A. , Stepanov E.G. , Golyandin D. , Dobrokhotov V.B. 
Published: December 2019

Abstract
The results of mechanochemical activation of natural silica are presented in this paper. It is shown that disintegration activation allows the preparation of highly dispersed oxide powders.
Determination of technological residual stresses in the surface layer of parts with thin-walled elements during turning
Authors: Nikitin A V , Tarikov I Ya , Vasilkov D V 
Published: December 2019

Abstract
At manufacture of heavy-duty parts, one of the important factors ensuring their safety operation is directional formation of technological residual stresses, nature of distribution of the latter having direct effect on the reliability indices. Concept of the deforming ability of the technological residual stresses was formulated as the moment load intensity adjusted to the surface. The method was proposed for calculation of torques from the effect of the technological residual stresses’ deforming ability as applicable to discrete models of parts with thin-walled elements at turning. Methodical specifics of the computation scheme formation for elastic after-effect of the technological residual stresses’ deforming ability at machining were discussed. Variants of schematization for standard elements of the parts were presented. Pre-requisites were formed for solving the task of controlling residual deformations of parts with thin-walled elements at turning.
Study of the transients with the loss of field of the synchronous generator in the industrial electric power station
Authors: Sokolov A. P. , Gazizova O. V. , Kondrashova Yu. N. 
Published: December 2019

Abstract
One of the main trends of industrial power engineering today is the need to improve the reliability of power supply of responsible consumers along with the increase of competitiveness of products by reducing cost. These requirements are ensured by the widespread introduction of distributed generation sources. These include mini combined heat and power unit, gas turbine, gas engine and combined-cycle gas turbine power plants. At the same time, such changes significantly complicate both the power supply system and possible modes of operation. One of the possible emergency modes in such networks is the loss of field of the synchronous generator. The admissibility of such a regime is specified by regulatory documents. In such a case this generator goes into asynchronous mode and consumes reactive power from the network. The aim of this work is to study the operation of a synchronous generator for a certain time in the asynchronous mode as a result of a loss of field and to develop measures to ensure the admissibility of such a mode in a complex looped network. An algorithm has been developed for calculating the electromechanical transients of a synchronous generator, taking into account the loss of machine field. Studies are carried out for various operational modes of an industrial power plant, taking into account the initial load of the generator using the KATRAN software package. The calculation results allow determining the generator load with active power, at which the synchronous generator can operate in the asynchronous mode without excitation.