Search results for: S.K. Pradhan

Items from 1 to 20 out of 126 results

article

Conventional and contemporary approaches for drought tolerance rice breeding: Progress and prospects

C Anilkumar, Rameswar Prasad Sah, Radha Beena, Muhammed Azharudheen TP, more

Drought is becoming a major threat to rice farming across the globe owing to the depletion of water tables in rice‐growing belts. Drought affects rice plants at multiple stages, causing damage at morphological and physio‐biochemical levels, leading to severe losses that exceed losses from all other stresses. The amalgamation of conventional breeding methods with modern molecular biology tools and...

article

Optimal path planning for mobile robots using oppositional invasive weed optimization

M.R. Panda, P.K. Das, S. Dutta, S.K. Pradhan

Computational Intelligence > 34 > 4 > 1072 - 1100

A mobile robot is an autonomous agent, capable of planning the path from source to destination in both, a known, or an unknown environment. In this paper, we presented a novel approach to find the optimal trajectory. We have hybridized oppositional‐based learning (OBL) with the evolutionary invasive weed optimization (IWO) technique to generate the optimal path for different robot(s). The navigation...

article

Dielectric and impedance properties of Bi(Zn2/3V1/3)O3 electronic material

S. Halder, K. Parida, S.N. Das, S.K. Pradhan, more

Physics Letters A > 2018 > 382 > 10 > 716-722

A polycrystalline vanadium doped lead free dielectric material of Bi(Zn_2/3V_1/3)O₃ (BZV) has been prepared using a standard high-temperature solid state reaction technique. Its temperature and frequency dependent capacitive, conductive and resistive characteristics are outlined though experimental investigation. The formation of single phase compound of BZV material with orthorhombic crystal symmetry...

article

Titanium anodisation designed for surface colouration - Systemisation of parametric interaction using response surface methodology

U. Balaji, S.K. Pradhan

Materials & Design > 2018 > 139 > C > 409-418

This work statistically examines the influence of operating parameters on the thin oxide layer developed during titanium anodisation and the complexity of parameter interactions on the surface colouration. The optimal parametric combinations for obtaining desired oxide thickness and interference colours are investigated. A three parametric Doehlert experimental design was employed for the purpose...

article

Through-thickness microstructural evolution during grain boundary engineering type thermomechanical processing and its implication on sensitization behavior in austenitic stainless steel

S.K. Pradhan, T.S. Prithiv, S. Mandal

Materials Characterization > 2017 > 134 > C > 134-142

Through-thickness microstructural variations and their synergistic influence on degree of sensitization in grain boundary engineering (GBE) treated 304L stainless steel was compared with solution-annealed and marginally cold-worked (~3% thickness reduction) specimens. The solution-annealed specimen has shown higher degree of sensitization due to the presence of lower fraction of Σ3 (as well as other...

article

Microstructure and electrical transport phenomenon of yttria alloyed nanocrystalline ceria solid solution synthesized by mechanical alloying

S. Dutta, S. Bandyopadhyay, A. Dutta, S.K. Pradhan

Materials Research Bulletin > 2017 > 93 > C > 333-341

This article reports the room temperature synthesis of nanocrystalline (4–20mol%) yttria (Y₂O₃) alloyed ceria (CeO₂)-based solid solutions in open air employing a single step mechanical alloying technique. Structure and microstructure of these compounds have been investigated and the effect of yttria on the electrical transport phenomenon of these compounds is revealed. Structure and microstructure...

article

Influence of processing parameters on dynamic recrystallization and the associated annealing twin boundary evolution in a nickel base superalloy

S.K. Pradhan, S. Mandal, C.N. Athreya, K. Arun Babu, more

Materials Science and Engineering: A > 2017 > 700 > C > 49-58

Dynamic recrystallization (DRX) kinetics and its association with annealing twins in alloy 617 has been studied in a range of strain rates (0.001s⁻¹ to 10s⁻¹) and temperatures (1173–1473K). In both low (< 0.1s⁻¹) and high (≥ 1s⁻¹) strain rate domains, DRX fraction is high as compared to intermediate strain rate (~ 0.1s⁻¹). The lower critical strain for DRX initiation with higher growth of DRX grains...

article

Chemical pressure induced change in multiferroicity of Bi1+2xGd2x/2Fe1−2xO3 bulk ceramics

S.K. Pradhan, D.R. Sahu, P.P. Rout, S.K. Das, more

Physica B: Condensed Matter > 2017 > 510 > C > 80-85

We have optimized Gd ion substitution in BiFeO₃ (BFO) and observed prominently change in structural, electrical and magnetic behavior of Bi_1+2xGd_2x/2Fe_1−2xO₃ ceramics synthesized through slow step sintering schedule. It is observed that with the increase in concentration of Gd (x=0.1), original structure of BFO is transformed from rhombohedral R3c space group to orthorhombic Pn21a space group. Surprisingly,...

article

Electrical transport and dielectric modulus formalism of CuO doped ZrO2 partially stabilized solid solution

S. Saha, A. Nandy, S.K. Pradhan, A.K. Meikap

Materials Research Bulletin > 2017 > 88 > C > 272-280

We have investigated the dielectric behavior and electrical transport property of partially stabilized nanocrystalline zirconia doped with copper oxide in the temperature range 373K<T<623K and in the frequency range 20Hz–1MHz. The samples are prepared by high energy ball milling method and Rietveld refinement method have been employed to figure out the structural and microstructural changes...

article

Microstructure correlated electrical conductivity of Manganese alloyed nanocrystalline cubic zirconia synthesized by mechanical alloying

A. Nandy, A. Dutta, S.K. Pradhan

Advanced Powder Technology > 2017 > 28 > 2 > 618-628

Fully stabilized cubic (c) ZrO₂ phase has been synthesized by mechanical alloying (MA) the stoichiometric powder mixture of elemental Mn (5–20mol%) and monoclinic (m) ZrO₂ at room temperature. XPS study reveals that major part of metallic Mn is ionized to Mn²⁺ oxidation state during MA. Mn-alloyed c-ZrO₂ nanoparticles with ∼18nm particle size have been synthesized within 10h of MA. Microstructures...

article

Effect of doping (Mg,Mn,Zn) on the microstructure and mechanical properties of spark plasma sintered hydroxyapatites synthesized by mechanical alloying

S. Lala, T.N. Maity, M. Singha, K. Biswas, more

Ceramics International > 2017 > 43 > 2 > 2389-2397

Although hydroxyapatite based bioceramics exhibit excellent bioactivity, their poor mechanical properties limit their applications to primarily as non-load bearing components and surface coating. The current investigation is aimed to mitigate this problem. In the present study, nanocrystalline undoped and 5mol% Mn, Mg and Zn-doped HAp powders are synthesized by mechanical alloying at room temperature...

article

Study of Ferroelectric and Piezoelectric Properties on Ca Doped PZT Ceramics

P. Kour, S.K. Pradhan, Pawan Kumar, S.K. Sinha, more

Materials Today: Proceedings > 2017 > 4 > 4 Part E > 5727-5733

Pb_1-xCa_xZr_0.52Ti_0.48O₃ ceramics with x = 0.02, 0.04, 0.06 and 0.10 were prepared by the sol gel technique. Raman and FTIR studies of the sample show the presence of both tetragonal and rhombohedral phases of PZT. It also indicates the enhanced strain in the sample due to the different ionic size of Ca²⁺ and Pb²⁺. Polarization versus electric field loops of the sample reveals that, the remnant polarization...

article

Structural and thermal characterization of PHAs produced by Lysinibacillus sp. through submerged fermentation process

S. Mohapatra, D.P. Samantaray, S.M. Samantaray, B.B. Mishra, more

International Journal of Biological Macromolecules > 2016 > 93 > PA > 1161-1167

In this investigation an attempt has been made to characterize and identify Lysinibacillus sp. 3HHX by 16S-rDNA sequencing. The bacterium exhibited occurrence of PHAs granules on an average 11±1 per cell of 1.0μm length and breadth 0.72μm, revealed from TEM studies. Under optimized condition, 4.006gm/L of PHAs was extracted using hypochlorite digestion and multi-solvent extraction process. PhaC gene...

article

A hybrid improved PSO-DV algorithm for multi-robot path planning in a clutter environment

P.K. Das, H.S. Behera, Swagatam Das, H.K. Tripathy, more

Neurocomputing > 2016 > 207 > C > 735-753

This paper proposed a novel approach to determine the optimal trajectory of the path for multi-robots in a clutter environment using hybridization of improved particle swarm optimization (IPSO) with differentially perturbed velocity (DV) algorithm. The objective of the algorithm is to minimize the maximum path length that corresponds to minimize the arrival time of all the robots to their respective...

article

Sintering behavior and growth mechanism of β-TCP in nanocrystalline hydroxyapatite synthesized by mechanical alloying

S. Lala, B. Satpati, S.K. Pradhan

Ceramics International > 2016 > 42 > 11 > 13176- 13182

Nanocrystalline carbonated HAp powder has been synthesized successfully within 2h by mechanical alloying the stoichiometric mixture of CaCO₃, CaHPO₄·2H₂O at room temperature under open air. To observe the sintering behavior of HAp the as-milled sample is sintered at different temperatures. The amorphous HAp phase (~14vol%) in as-synthesized sample transforms completely to crystalline HAp after sintering...

article

Microstructure and optical characterizations of mechanosynthesized nanocrystalline semiconducting ZrTiO4 compound

Hema Dutta, Anshuman Nandy, S.K. Pradhan

Journal of Physics and Chemistry of Solids > 2016 > 95 > C > 56-64

A ZrO₂–TiO₂ solid solution is obtained by high energy ball milling of equimolar mixture of monoclinic (m) ZrO₂ and anatase (a) TiO₂. Nanocrystalline orthorhombic ZrTiO₄ compound is initiated from the nucleation of TiO₂–ZrO₂ solid solution with isostructural s-TiO₂ (srilankite) base after 30min of milling. After 12h of milling, 95mol% non-stoichiometric ZrTiO₄ phase is formed. Post-annealing of 12h...

article

Structure, optical and magnetic characterizations of Mn doped ZnS dilute magnetic semiconductor synthesized by mechanical alloying

S. Sain, A. Kar, M. Mukherjee, D. Das, more

Advanced Powder Technology > 2016 > 27 > 4 > 1790-1799

Pristine Mn doped ZnS (Zn₁₋_xMn_xS, x=0.03–0.1) dilute magnetic semiconductors (DMSs) have been synthesized for the first time by mechanical alloying the stoichiometric mixture of the elemental powders with different Mn concentrations at room temperature under inert atmosphere without any impurity or secondary phase formation. Successive presence of both major cubic and minor hexagonal phases in all...

article

Investigation of dielectric and electrical behaviour of nanocrystalline Zn1−xMnxO (x=0 to 0.10) semiconductors synthesized by mechanical alloying

S. Choudhury, S. Sain, M.K. Mandal, S.K. Pradhan, more

Physica E: Low-dimensional Systems and Nanostructures > 2016 > 81 > C > 122-130

The results on the measurement of electric and dielectric behaviour and capacitance–voltage characteristics of Zn_1−xMn_xO (x=0 to 0.10) nanocrystalline semiconductors are reported. Direct current conductivity increases with the increase Mn concentration and its thermal behavior can be explained by adiabatic polaronic hopping model. The alternating current conductivity obeys a power law of temperature...

article

Microstructure characterization and electrical transport of nanocrystalline Zn0.90Mn0.10O semiconductors synthesized by mechanical alloying

S. Choudhury, S. Sain, M.K. Mandal, S.K. Pradhan, more

Materials Research Bulletin > 2016 > 77 > C > 138-146

We report a comprehensive study of dc and ac conductivity, dielectric relaxation and capacitance–voltage characteristics of Mn doped ZnO nanocrystalline semiconductors prepared by mechanical alloying. Samples are characterized by HRTEM and XRD. Direct current conductivity increases with the increase in temperature and the thermal behavior of electrical dc conductivity for the investigated samples...

article

Magnesium substitution in carbonated hydroxyapatite: Structural and microstructural characterization by Rietveld's refinement

S. Lala, M. Ghosh, P.K. Das, D. Das, more

Materials Chemistry and Physics > 2016 > 170 > C > 319-329

Four stoichiometric compositions of nanocrystalline Mg doped carbonated hydroxyapatite (cHAp) powders are synthesized by mechanical alloying (ball milling) the powder mixtures of CaCO₃, CaHPO₄.2H₂O and MgO in open air at room temperature. FTIR analysis confirms the A-type carbonation in all milled HAp powder samples (A-cHAp). Microstructure characterization in terms of lattice imperfections and phase...

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Search results for: S.K. Pradhan

Conventional and contemporary approaches for drought tolerance rice breeding: Progress and prospects

Optimal path planning for mobile robots using oppositional invasive weed optimization

Dielectric and impedance properties of Bi(Zn2/3V1/3)O3 electronic material

Titanium anodisation designed for surface colouration - Systemisation of parametric interaction using response surface methodology

Through-thickness microstructural evolution during grain boundary engineering type thermomechanical processing and its implication on sensitization behavior in austenitic stainless steel

Microstructure and electrical transport phenomenon of yttria alloyed nanocrystalline ceria solid solution synthesized by mechanical alloying

Influence of processing parameters on dynamic recrystallization and the associated annealing twin boundary evolution in a nickel base superalloy

Chemical pressure induced change in multiferroicity of Bi1+2xGd2x/2Fe1−2xO3 bulk ceramics

Electrical transport and dielectric modulus formalism of CuO doped ZrO2 partially stabilized solid solution

Microstructure correlated electrical conductivity of Manganese alloyed nanocrystalline cubic zirconia synthesized by mechanical alloying

Effect of doping (Mg,Mn,Zn) on the microstructure and mechanical properties of spark plasma sintered hydroxyapatites synthesized by mechanical alloying

Study of Ferroelectric and Piezoelectric Properties on Ca Doped PZT Ceramics

Structural and thermal characterization of PHAs produced by Lysinibacillus sp. through submerged fermentation process

A hybrid improved PSO-DV algorithm for multi-robot path planning in a clutter environment

Sintering behavior and growth mechanism of β-TCP in nanocrystalline hydroxyapatite synthesized by mechanical alloying

Microstructure and optical characterizations of mechanosynthesized nanocrystalline semiconducting ZrTiO4 compound

Structure, optical and magnetic characterizations of Mn doped ZnS dilute magnetic semiconductor synthesized by mechanical alloying

Investigation of dielectric and electrical behaviour of nanocrystalline Zn1−xMnxO (x=0 to 0.10) semiconductors synthesized by mechanical alloying

Microstructure characterization and electrical transport of nanocrystalline Zn0.90Mn0.10O semiconductors synthesized by mechanical alloying

Magnesium substitution in carbonated hydroxyapatite: Structural and microstructural characterization by Rietveld's refinement

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