bluuebunny/crossref_metadata_2025_split huggingface dataset:
Compression behaviour of brick masonry strengthened with Textile Reinforced Concrete (TRC) – A preliminary study
Authors: Lakshmi Anuhya C , Anand K B , Gopinath Smitha , Madheswaran C K , Prabhakar J , Thivya Devi K G 
Published: December 2019

Abstract
Masonry is one of the most widely used conventional materials throughout the world but its failure mainly occurs due to low tensile resistance. The main objective of this study is to observe the effectiveness of the relatively new construction material Textile Reinforced Concrete (TRC), in strengthening the brick masonry prism. In the present work TRC consisting of an overnight cementitious curing mortar (OCCM) along with alkali resistant glass textile which can resist high tensile stress is used for strengthening of unreinforced brick masonry. The technique adopted in this work is not time consuming and is also practically feasible. Tests were carried out to study the axial compressive behaviour of prisms strengthened with cast-in-place TRC overlays and pre-cast TRC laminae with varying reinforcement ratios. Detailed investigations were carried out to observe failure patterns and ultimate failure load. From observations, 4 ply TRC overlays were found to be more effective. Among all strengthening methods mortar bonded TRC laminae exhibited enhancement in terms of compressive strength. It is concluded that this technique may benefit many applications in the area of masonry retrofit.
Parkinson’s Tremor Suppression Using Active Vibration Control Method
Authors: Lekshmi A , Ramachandran K I 
Published: December 2019

Abstract
Parkinson’s disease is the second most common neuro-degenerative disorder. The hallmark symptom of Parkinson’s disease known as tremor, affects the patients in carrying out most of their daily life activities. In this paper, a biodynamic model of human arm is used to imitate the behavior of Parkinson’s tremor and suppression of this tremor is performed using a Proportional-Integral-Derivative (PID) controller which is optimized using Genetic Algorithm (GA) to obtain better performance. Active vibration controlling technique which incorporates sensors and actuators to detect and counteract the tremor is implemented with the help of PID controller.
Magnetoelectric 0.2(CoFe2O4)-0.8(Ba0.85Ca0.15 Zr0.1Ti0.9O3) lead free composite for spintronic applications
Authors: Suresh Pittala , Vishnunarayanan S. , Anil Kumar P S 
Published: December 2019

Abstract
Lead free (0.2) CoFe2O4 (CFO) – (0.8) Ba0.85Ca0.15Zr0.1Ti0.9O3 (BCZT) composite is prepared by mechanical mixing of CFO and BCZT phases. The constituent phases, CFO and BCZT are prepared by sol-gel technique. XRD data shows characteristic peaks of both magnetic and piezoelectric phases without any secondary phases confirming the formation of the composite. Polarization (P) versus Electric field (E) measurements show a proper ferroelectric loop for BCZT with P
max ∼ 4.3 μC/cm2 whereas composite shows a leaky behaviour. Room temperature M-H loops show a decrease of magnetization from ∼ 80 emu/g for pure CFO to 17 emu/g for composite. Thus, 0.2 CFO-0.8 BCZT composite shows both electric and magnetic properties at room temperature.
Synthesis and electrical properties of lead-free piezo electrics for magnetoelectric applications
Authors: Pullarao Teneti , Vishnunarayanan S. , Suresh Pittala , Nagaraju G 
Published: December 2019

Abstract
The Lead-free piezoelectric polycrystalline materials, BaTiO3 (BTO) and Ba0.85Ca0.15Zr0.1Ti0.9O3 (BCZT) ceramic are prepared by sol-gel synthesis method. The synthesis dynamics and the effect of sintering temperature on the purity and the formation of morphotropic phase boundaries in these samples are investigated. X-ray Diffraction studies show the cubic phase for the BTO at low temperature, whereas it transforms into the tetragonal for high-temperature synthesis. The BCZT exists in the mixed phases of tetragonal and orthorhombic structures. Formation of MPBs in BCZT are observed for the sintering temperature above 1350 °C. Polarization (P) versus electric field (E) measurement shows enhanced polarization values for the BCZT in comparison to the BTO.
Structural and Magnetic Studies of Zinc Substituted Cobalt Ferrite Nanoparticles prepared by Sol–Gel Technique
Authors: Lakshmi V K , Kumar Gangothri S , Anugraha A , Raguram T , Rajni K S 
Published: December 2019

Abstract
All Magnetic nanoparticles are newly explored materials due to its large surface to volume ratio, smaller grain size, quantum confinement effect, large uni-axial anisotropy and superparamagnetism. In the present study, Zinc substituted cobalt ferrite nanoparticles are prepared by sol-gel auto-combustion method with copper concentration varies from 0.0 to 0.0. Structural studies are taken by XRD, it was confirmed that the sample has pure cubic spinel phase structure and the crystallite size decreases from 25nm to 15nm as the Zn content increases. Raman spectroscopy confirming the spinel structure and in the case of Co1-xZnxFe2O4, the Raman bands show a shoulder-like feature at the lower wavenumber which are Raman active bands in Fe3O4 all the tetrahedral and octahedral sites are occupied by Fe ions. From FTIR Analysis, the peak observed at 433 cm−1 and around 580 cm−1 it confirms the metal oxygen vibration at octahedral and tetrahedral site. Morphological analysis shows that the spherical sized particles with pores due to the evolution of gases during the annealing process at higher temperature. The magnetic studies reveals that as the ratio of metal nitrates increases, the coercivity and remanence decreases following a hysteresis path. By the above characterization technique we were successfully able to confirm the substitution of Zinc in the octahedral sites of cobalt ferrite.
Studies on the Effect of Process Parameters in Turning of Ti-6Al-4V Alloy Using Topsis
Authors: Rao Charitha M , Rao Shrikantha S , Herbert Mervin A 
Published: December 2019

AbstractOptimization of process parameters in turning process is the fundamental machining operation which leads to better machining performance. This study has applied Technique for Order Performance by Similarity to Ideal Solution (TOPSIS) method to obtain the optimum process parameters in turning of Ti-6Al-4V alloy using Polycrystalline Diamond (PCD) cutting tool insert. The process parameters chosen for optimization were cutting velocity, feed rate and depth of cut. The objective is to minimize cutting temperature, tool wear, and surface roughness. TOPSIS is employed to analyze the input parameters on output performance characteristics. Nine experiments were conducted under MQL (Minimum Quantity Lubrication) environment based on an L9orthogonal array, respectively. The optimization results indicate turning Ti-6Al-4V alloy at cutting velocity of 150 m/min, the feed rate of 0.5 mm/rev and depth of cut of 0.5 mm as optimum parameters obtained by TOPSIS technique. From the Analysis of variance (ANOVA), it was identified that depth of cut parameter is the most influencing process parameter on turning performance characteristics.
Room temperature multiferroic properties of hexagonal Lu0.85Sr0.15FeO3 ceramics
Authors: Poojitha K U , Suresh Pittala , Anil Kumar P S 
Published: December 2019

Abstract
The structural, electric and magnetic properties of bulk hexagonal Lu1-x
Sr
x
FeO3 (x = 0 and 0.15) ceramics are investigated. XRD data and rietveld refinement confirm the hexagonal structure with P63cm space group. Magnetic measurements for Sr-doped sample indicate a ferromagnetic-like behavior at the room temperature with a very high coercivity of the order of ∼ 4.4 kOe. P-E hysteresis loops show an enhanced ferroelectric property with Sr doping. Hence, towards the realization of applications, the multiferroic properties of hexagonal LuFeO3 are improved remarkably by 15% Sr substitution at Lu site.
Role of spin-orbit coupling in semimetallic bulk Bismuth
Authors: Jena Soumyasree , Datta Sanjoy 
Published: December 2019

Abstract
Ever since the prediction of nontrivial topological band structure in Bi1-xSbx and its subsequent experimental verification, semimetallic bismuth (Bi) has been used quite regularly in a large class of topologically nontrivial materials. On top of it, the recent unexpected discovery of superconductivity in the bulk Bismuth has made it an even more enigmatic material. Although, bulk bismuth has been studied quite extensively both theoretically and experimentally, the observation of superconducting ground state in bulk Bismuth at ambient pressure demands elaborate cross-examination of the electronic structure of Bi. Here, we have used density-functional-theory based first principle calculation to probe the system systematically and obtained qualitative agreement with the experimental result. Int erestingly, we have observed the presence of electron pocket close to the symmetry point L and hole pocket near the symmetry point T albeit without the inclusion of spin-orbit coupling. Furthermore, when spin-orbit interaction is taken into account the hole pocket at T disappears and reappears close to Г rather strongly. We demonstrated the importance of structural optimization and proper Brillouin zone sampling in reproducing the semimetallic behaviour of Bi.
Structural, Optical, Functional, Morphological and Compositional Analysis of Ni - doped TiO2Nanofibers Prepared by Electrospinning Technique
Authors: Amritha C , Kurian Silpa , Raguram T , Rajni K S 
Published: December 2019

AbstractIn the present work, three different concentration of Nickel is doped with TiO2/PVA nanofibers by electrospinning method which can be used as photoanode in DSSC applications. The samples are annealed at 2000C for one hour. XRD results show the anatase phase of the prepared samples. FESEM images of different concentration of nanofibers show that diameter of nanofibers depends on the concentration of Ni. Large concentrations of nanofibers show fewer diameters of nanofibers. The EDX spectrum clearly confirmed that the TiO2composite nanofibers are consists of nickel, titanium and oxygen elements. From UV-DRS studies, redshift is observed with the increase in dopant concentration. The transitions are direct and indirect allowed and the calculated bandgap finds to be decreasing with increase in dopant concentration. PL spectra of Ni-doped samples show less intensity, which indicates the low recombination rate and intensity decreases with increase in dopant concentration. It is concluded that Ni is doped with TiO2/PVA gives better energy conversion efficiency in DSSC compare to undoped TiO2.
Analysis of surface hardness and surface roughness in diamond burnishing of 17-4 PH stainless steel
Authors: Sachin B , Narendranath S , Chakradhar D 
Published: December 2019

Abstract
Burnishing is a chipless secondary finishing operation which yields excellent surface finish. The present work focuses on multi-response optimization of diamond burnishing on 17-4 precipitation hardenable stainless steel under dry environment by using Taguchi based grey relation analysis (TGRA) to simultaneously minimize surface roughness and maximize surface hardness. The effect of the process parameters such as burnishing speed, burnishing feed and burnishing force on performance characteristics like surface roughness and surface hardness were studied. Taguchi’s L9 orthogonal array has been adopted for the experimental design. The optimal burnishing process parameters were found to be burnishing speed of 73 m/min, burnishing feed of 0.048 mm/rev and burnishing force of 150 N. Burnishing feed is the most significant parameter on burnishing performance characteristics. It has been proved that the performance characteristics of a diamond burnishing process have been improved by effective use of this technique.
Preparation and Characterisation of PVA+TiO2 Nanofiber by Electrospinning Technique
Authors: Kurian Silpa , Amrita C , Raguram T , Rajni K S 
Published: December 2019

Abstract
In the present work PVA+TiO2 nanofibers were prepared by electrospinning technique. Structural and Functional groups were carried out by X-Ray diffraction and FTIR technique. The optical analysis was analysed by UV-DRS and Photoluminscence studies. Morphology and compositional were characterized by FESEM and EDS analysis. From Structural analysis shows PVA+TiO2 anatase crystal structure and crystallite size are nanometers. The FTIR technique was used to find out the functional groups present in the prepared set of samples. The optical analysis shows above 70% transparency in the visible region. From the PL analysis titanium and oxygen vacancies are found to be 375 and 526 nm. FESEM analysis of the annealed samples shows the uniformity of nanofibers without any beads which is attributed to the interaction of TiO2 particles with the PVA matrix. From the compositional analysis, the atomic weight percentage of Ti and O increases with the TiO2 loading in PVA.
Investigations on Wire Electro Discharge Machining (WEDM) characteristics of NiTi Shape Memory Alloy
Authors: Kulkarni Vinayak N , Gaitonde V N , Nalavade K S , Patil M S 
Published: December 2019

AbstractNiTi(Nickel Titanium) Shape Memory Alloys (SMA) are expeditiously replacing conventional materials in aerospace, automobile, robotics and bio-engineering fields due to its distinctive characteristics like shape memory effect, pseudo elasticity and biocompatibility. Machining of these alloys is strenuous by traditional methods. The unconventional methods like wire electro discharge machining (WEDM) can competently machine these SMAs. But improper selection of WEDM parameters may lead to undesirable results such as poor surface finish and higher machining time. The present study attempts to explore the influence of three system variables; pulse on time, pulse off time and wire feed on performance criteria’s like material removal rate (MRR) and surface roughness (SR) during WEDM of NiTi SMA. Experiments were conducted in accordance with Full Factorial Design (FFD) and results were analysed using Response surface methodology (RSM) based mathematical models. The investigation outcomes revealed that pulse on time has more influence on MRR and SR than pulse off time and wire feed. Maximum MRR is achieved at higher pulse on time with the combination of higher pulse off time and lower wire feed rate. Better surface finish is observed at decreased pulse on time, increased pulse off time and minimum wire feed rate.
Polymer-iron tungstate-reduced graphene oxide nanocomposites for microwave absorption
Authors: Sanjay Krishna M , Balaji S , Vadamalai Raj G , Pravin P A , Sathish Kumar M , Kothurkar Nikhil K , Ramani Prasanna , Sabarish Narayanan B , Moorthy Arjun 
Published: December 2019

Abstract
Three polymers were used in the preparation of three-component nanocomposites. Sulphonated poly(ether-ether-ketone) (SPEEK) was synthesized by sulphonation of powdered poly(ether-ether-ketone) (PEEK) using concentrated sulphuric acid. Polyvinyl alcohol (PVA) was used as purchased. Polyaniline (PANI) was synthesized using aniline, hydrochloric acid and ammonium persulphate. Three nanocomposite films based on SPEEK, PVA and PANI were synthesized through solution casting from N-Methyl-2-pyrrolidone (NMP) solutions with a magnetic filler, iron tungstate (FeWO4) and a conductive filler, reduced graphene oxide (RGO) dispersed in them. The synthesized PANI was characterized by X-ray diffraction (XRD), ultraviolet-visible spectroscopy (UV-vis), Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) and scanning electron microscopy (SEM) and the nanocomposites (RGO/PANI, FeWO4/PANI, FeWO4-RGO/PANI) were characterized by FTIR, TGA, DSC and SEM. The nanocomposite films based on SPEEK and PVA containing 2% RGO and 2% FeWO4 showed the electromagnetic interference (EMI) reflection loss of only -0.5 dB for a 0.1 mm thick sample. The PANI based nanocomposite film containing 2% RGO and 2% FeWO4 showed the maximu m EMI reflection loss of -4.5 dB for a 0.1mm thick sample.
Colloidal Synthesis and Characterization of Nanowires of Triclinic Cu3SnS4
Authors: Mathew Maya , Preetha KC 
Published: December 2019

Abstract
In this paper we report the colloidal synthesis and characterization of triclinic nanowires of Cu3SnS4. The XRD pattern of the as - prepared sample matches well with JCPDS No. 33-0501. Triclinic crystals of average crystallite size of about 3.7 nm were formed. The absorption spectrum consists of two SPR peaks which are characteristic of nanowires, corresponding to the axial and longitudinal vibrations of electrons on its surface. The bandgap of Cu3SnS4 nanowire is found to be 1.66 eV and so it can find application in the absorber layer of solar cells.
A facile route for the synthesis of nickel foam modified WSe2:CdS nanohybrid as an efficient catalyst for hydrogen evolution reaction (HER)
Authors: Karfa P , Majhi K C , De S , Madhuri R 
Published: December 2019

Abstract
Nickel foam was synthesized via a easy and time consuming method with the help of microwave, the nickel foam was then modified with very impressive rod shaped nanoparticle WSe2-CdS. The pores of the nickel foam are very clear and uniform in size with the nanoparticle attached in the surface of the foam. The prepared nanohybrid foam (Nifoam@WSe2-CdS) shows good performance towards hydrogen evolution reaction with small onset potential of -0.30 V and very low tafel slope that is 44 mV/dec. The electrocatalyst was prepared with earth abundant material with low cost of synthesis. Prepared electrocatlyst shows high durability over acidic medium for several time periods with unchanged electrochemical behavior.
Synthesis, Structural and Electrical Properties of Y1-xCaxFeO3 (X = 0.03 and 0.05) Ceramics
Authors: Suthar L , Bhadala F , Roy M , Singh R P 
Published: December 2019

Abstract
The single-phase ceramic samples of Perovskite Y1-xCaxFeO3 (YCFO) were synthesized successfully by solid state reaction method. The prepared samples of YCFO were analyzed by roo m temperature X-ray diffraction techniques and the data were fitted with FullProf program which confirmed the orthorhombic symmetry with Pn ma space group. To estimate electrical parameters the samples were analy zed by I-V and dielectric measurement techniques and observed that the overall conductivities enhances with increase in temperature as well as with doping concentration.
Effect of pH on SILAR deposited CTS thin films
Authors: Sapna P , Preetha KC 
Published: December 2019

Abstract
Copper tin sulphide thin films have been prepared using successive ionic layer adsorption and reaction method on soda lime glass substrate. In this work cationic precursor solution bath contains copper chloride, tinchloride, triethanolamine and anionic precursor solution contains thioacetamide respectively for the deposition of thin films. The prepared films were characterized by X-ray diffraction spectroscopy (XRD), UV-Vis NIR spectroscopy, scanning electron microscopy(SEM) and energy dispersive analysis(EDS). Average crystalline size calculated using Debye-Scherrer formula is 65.59nm for CTS1 and 71.17nm for CTS2. Band gap of CTS1 is 1.899ev and that of CTS2 is 1.647ev. The band gaps are suited for solar cell applications.
Effect of codoping of Rare Earth ions on Microstructure and Band Gap of Ti0.98A0.01Gd0.01O2 (A: Sm/Eu/Tb) Nanostructures Synthesized by modified hydrothermal method
Authors: Naseem Swaleha , Khan Wasi , Khan Shakeel , Husain Shahid 
Published: December 2019

Abstract
Sm3+, Eu3+, Tb3+ and Gd3+ ions have been incorporated in anatase TiO2 nanostructures by a hydrothermally modified sol gel method. XRD data analysis revealed the formation of pure anatase phase that crystallizes in the tetragonal crystal symmetry without any secondary phase. FTIR spectra indicate stretching vibrations of bonds in the nanostructures. The absorption peak centered at 568 cm−1 is related to the Ti-O-Ti stretching vibrations. Morphological studies and grain size estimation were performed by SEM measurements. SEM images depict nonuniform distribution of grains with a considerable variation in grain size. EDS measurements ensure chemical compositions in the samples. UV-visible absorption spectroscopy was used to study the optical properties. The doping of rare earth ions (Sm3+, Eu3+, Tb3+) leads to the variation in band gap of TiO2. Photoluminescence (PL) spectra indicate a significant change in the intensity on the doping of rare earth ions.
Effect of Scandium on Homogenization Treatment and Friction Stir Processing on Mechanical Properties of 7075 Aluminium Alloy Prepared by Foundry Route
Authors: Mandal P. K. , Felix John , Varkey Merrin J. , Vishnu KC 
Published: December 2019

Abstract
The aluminium alloy (7075 series) with minor scandium addition prepared by foundry route, was subjected to homogenization treatment at different temperature from 300 to 500°C for 8h and also multi-pass friction stir processing (MP-FSP) was performed to improve surface properties of cast aluminium alloy. The effect of minor scandium (0.33wt.%) on the microstructure and mechanical properties of prepared alloy was investigated using optical microscopy, SEM, FESEM, XRD, TEM, Vicker’s hardness and tensile test. The homogenized microstructure was obtained showing fine grains because homogenization of cast structure and dispersion of second-phase particles also occur. The Al-Zn-Mg alloy with high strength, good corrosion resistance and good welding property is used widely in various industrial applications. In addition of Sc to increase the strength mainly comes from fine grain strengthening, substructure strengthening and precipitation strengthening caused by Al3(Sc) and MgZn2 particles. These particles are formed during homogenization treatment of cast aluminium alloy and it has great influence on precipitation behaviour of Al3(Sc) particles.
Degradation of Organic and Toxic Pollutants by Embedding the Barium Titanate Nanoparticles in Polyaniline Matrix (BaTiO3@PANI)
Authors: Shah Aadil Abass , Azam Ameer 
Published: December 2019

Abstract
The embedment of barium titanate nanoparticles (BaTiO3 NPs) in the polyaniline (PANI) matrix play a significant role in enhancing the properties of nanocomposites. In this research work BaTiO3@PANI polymer nanocomposites were well synthesized by the in-situ polymerization by embedding different concentrations of BaTiO3 NPs (1wt%, 3wt%, 5wt%, 7wt %) in the polyaniline matrix. The resulting nanocomposites were characterized for their structural, optical and photocatalytic properties. BaTiO3@PANI nanocomposites exhibited higher photocatalytic activity than pure PANI and pure BaTiO3 NPs towards the organic and toxic pollutants in liquid phase under visible light irradiation. The embedment of BaTiO3 NPs in PANI have played an important role in affecting the photo reactivity and the increased weight ratio of BaTiO3 NPs in PANI increased the photocatalytic efficiency of nanocomposites. The structural and optical properties were studied by XRD, FTIR and UV-Visible spectroscopy. The XRD confirmed the embedment of BaTiO3 NPs in PANI matrix. The Fourier Transform Infra-Red (FTIR) spectroscopy identified the various functional groups and their respective vibrational and stretching modes. The results revealed that higher concentration of BaTiO3 NPs in PANI proves to be a better photocatalyst. This work provides a comprehensive information to modify the polymers with nanoparticles.