Search results for: O. P. Pandey

Items from 1 to 20 out of 62 results

article

Tribological properties of hybrid aluminium matrix composites reinforced with boron carbide and ilmenite particles for brake rotor applications

Rahul Gupta, Tarun Nanda, O. P. Pandey

Archives of Civil and Mechanical Engineering > 2023 > Vol. 23, no. 1 > art. no. e47, 2023

In the present study, stir casting process was employed to incorporate a blend mixture of ilmenite (FeTiO₃) and boron carbide (B₄C) particles in the matrix of LM13 base alloy. The study demonstrated the effect of individual reinforcement, weight percentage and mixing proportion on wear behaviour of LM13 alloy for brake rotor applications. Composite with 15 wt.% of reinforcement having 75% proportion...

article

Infuence of heat treatment (routes) on the microstructure and mechanical properties of 300M ultra high strength steel

Shivraj Singh Kasana, Sandeep Sharma, O. P. Pandey

Archives of Civil and Mechanical Engineering > 2022 > Vol. 22, no. 3 > art. no. e126

The study covered investigation of heat treatment (routes) effect on heat treatment of 300M ultra high strength steel to achieve the desired microstructure and the corresponding mechanical properties. 300M steel was prepared and subjected to diferent homogenization and forging processing. Structure-property relationship was established for both conventional and heat treatment route as well as isothermal...

article

Effect of electroslag remelting and homogenization on hydrogen flaking in AMS-4340 ultra-high-strength steels

Shivraj Singh Kasana, O. P. Pandey

International Journal of Minerals, Metallurgy, and Materials > 2019 > 26 > 5 > 611-621

Hydrogen flakes and elemental segregation are the main causes of steel rejection. To eliminate hydrogen flaking, the present study focuses on the manufacture of AMS-4340 ultra-high-strength steel through an alternate route. AMS-4340 was prepared using three different processing routes. The primary processing route consisted of melting in an electric arc furnace, refining in a ladle refining furnace,...

article

Ultrasonic P- and S-Wave Attenuation and Petrophysical Properties of Deccan Flood Basalts, India, as Revealed by Borehole Studies

Nimisha Vedanti, Ajay Malkoti, O. P. Pandey, J. P. Shrivastava

Pure and Applied Geophysics > 2018 > 175 > 8 > 2905-2930

Petrophysical properties and ultrasonic P- and S-wave attenuation measurements on 35 Deccan basalt core specimens, recovered from Killari borehole site in western India, provide unique reference data-sets for a lesser studied Deccan Volcanic Province. These samples represent 338-m-thick basaltic column, consisting four lava flows each of Ambenali and Poladpur Formations, belonging to Wai Subgroup...

article

Complexity in elucidating crustal thermal regime in geodynamically affected areas: A case study from the Deccan large igneous province (western India)

O. P. Pandey, Nimisha Vedanti, Ravi P. Srivastava

Journal of the Geological Society of India > 2017 > 90 > 3 > 289-300

Complexity in the earth’s crustal structure plays an important role in governing earth’s thermal and geodynamic behavior. In the present study, an attempt has been made taking insights from our recent geological, geochemical, petrophysical and geophysical findings from specially drilled deep boreholes, to understand the lithospheric thermal evolution of the highly complex western India, which forms...

article

Janardan Ganapatirao Negi (1936-2016)

R. N. Singh, V. P. Dimri, O. P. Pandey

Journal of the Geological Society of India > 2017 > 90 > 1 > 127-127

article

Seismically Derived Gondwana and Proterozoic Sediments East of Cuddapah Basin, South Indian Shield and Its Possible Geotectonic Implications

K. Chandrakala, O. P. Pandey, V. V. Sesha Sai, A. Vasanthi, more

Pure and Applied Geophysics > 2017 > 174 > 7 > 2601-2619

The study area situated east of the intracratonic Proterozoic Cuddapah basin, that covers Nellore Schist belt, Ongole domain of the Eastern Ghats Belt and adjacent East Coast Terrain, forms a geodynamically important segment of the Dharwar craton. This region came into focus due to proposition that during Paleoproterozoic to Mesoproterozoic era, it underwent persistent oceanic subduction, continent–continent...

article

Optimization of High Conducting Na₃Zr₂Si₂PO₁₂ Phase by new Phosphate Salt for Solid Electrolyte

Paramjyot Kumar Jha, O. P. Pandey, K. Singh

Silicon > 2017 > 9 > 3 > 411-419

A composition of NASICON (Na₃Zr₂Si₂PO₁₂) was synthesized by the solid-state reaction method using a new compound Na₂HPO₄2H₂O. The X-ray diffraction patterns of all samples exhibit monoclinic Na₃Zr₂Si₂PO₁₂ as a major phase with a very small amount of monoclinic-ZrO₂. The maximum relative density (97 %) and maximum conductivity is obtained in the samples sintered at 1200 °C (N3) which is slightly higher...

article

Anomalous Seismic Velocity Drop in Iron and Biotite Rich Amphibolite to Granulite Facies Transitional Rocks from Deccan Volcanic Covered 1993 Killari Earthquake Region, Maharashtra (India): a Case Study

O. P. Pandey, Priyanka Tripathi, Nimisha Vedanti, D. Srinivasa Sarma

Pure and Applied Geophysics > 2016 > 173 > 7 > 2455-2471

65 Ma Deccan Volcanic Province of western India forms one of the largest flood basaltic eruptions on the surface of the earth. The nature of the concealed crust below this earthquake prone region, which is marked by several low velocity zones at different depths has hardly been understood. These low velocity zones have been invariably interpreted as fluid-filled zones, genetically connected to earthquake...

article

Study of photocatalytic degradation of environmentally harmful phthalate esters using Ni-doped TiO₂ nanoparticles

P. Singla, O. P. Pandey, K. Singh

International Journal of Environmental Science and Technology > 2016 > 13 > 3 > 849-856

Undoped and Ni-doped TiO₂ nanoparticles are synthesized using sol–gel technique. The physical, structural, optical and thermal properties of the samples are investigated using X-ray powder diffraction, Fourier transform infrared spectroscopy, transmittance electron microscopy, UV–visible diffuse reflectance and thermogravimetric analysis. The photocatalytic activity of the samples is investigated...

article

Grain size distribution dependent magnetic and ferroelectric properties in sol–gel driven BiFeO₃ thin films

Shiwani Sharma, P. Saravanan, O. P. Pandey, Puneet Sharma

Journal of Materials Science: Materials in Electronics > 2016 > 27 > 6 > 5909-5915

The effect of thickness induced grain size distribution on the magnetic and ferroelectric behaviour of sol–gel driven BiFeO₃ (BFO) thin films was investigated in this study. FESEM micrographs showed well-crystallized equiaxed grains with minimal porosity. The magnetization (M) versus magnetic field (H) indicated the well saturated hysteresis loops at 300 K. The saturation magnetization (M ...

article

Brief report: Volume dependence of Grüneisen parameter for solids under extreme compression

Sanjay Kumar, S K Sharma, O P Pandey

Pramana > 2016 > 87 > 2 > 1-4

The Nie expression is amended in such a way that the expression follows the infinite pressure behaviour, i.e., P → ∞ $P\to \infty$ or V → 0. A new empirical relationship is developed to predict the values of volume dependence of Grüneisen parameter. NaCl and ε-Fe have been employed to test the suitability of the expression. The results obtained reveal that the relationship is reliable as there...

chapter

Carbon Nanotubes and Cellulose Acetate Composite for Biomolecular Sensing

Padmaker Pandey, Anamika Pandey, O. P. Pandey, N. K. Shukla

Advanced Bioelectronic Materials > Systematic Bioelectronic Strategies > 413 - 426

This chapter contains sections titled: Introduction Background of the Work Materials and Methodology Characterisation of Membranes pH Measurements Using Different Membranes Conclusion

article

Mechanical, dielectric and optical assessment of glass composites prepared using milling technique

Gurbinder Kaur, G Pickrell, V Kumar, O P Pandey, more

Bulletin of Materials Science > 2015 > 38 > 4 > 1003-1008

In the present investigation, mechanical and spectroscopic properties of glass composites have been investigated. The glass composites have been prepared by the milling technique instead of using any filler particle. Due to the presence of different alkaline earth modifiers in composites, marked difference in their strength and optical properties is observed. The band gap, Urbach energy and the extinction...

article

Thermal stability and structural properties of Ta nanopowder synthesized via simultaneous reduction of Ta₂O₅ by hydrogen and carbon

Loveleen K. Brar, Gourav Singla, Navjot Kaur, O. P. Pandey

Journal of Thermal Analysis and Calorimetry > 2015 > 119 > 1 > 175-182

Tantalum nanoparticles have been synthesized by the single-step chemical reaction route. Simultaneous reduction of Tantalum Pentoxide (Ta₂O₅) with the in situ produced hydrogen and carbon at 600 °C is a new approach for the production of Ta nanopowder. ΔH values obtained from thermodynamic calculations are used to predict the entire mechanism of reduction of bulk Ta₂O₅ into Ta nanoparticles. The results...

article

Preferential occupancy of Ca²⁺ dopant in La_1-xCa_xInO_3-δ (x = 0–0.20) perovskite: structural and electrical properties

Kapil Sood, K. Singh, Suddhasatwa Basu, O. P. Pandey

Ionics > 2015 > 21 > 10 > 2839-2850

Ca-doped LaInO₃ (LCI) has been synthesized by conventional solid-state reaction method. The structural features were investigated by X-ray diffraction, Raman spectroscopy and X-ray photoelectron spectroscopy. The structural investigation indicated that Ca²⁺ dopants occupy both A- and B-sites in ABO₃ (La_1-xIn_xO_3-δ). The solid solubility limit has been observed up to x = 0.10 for La_1-xCa_xInO_3-...

article

Synthesis of visible light-responsive cobalt-doped TiO₂ nanoparticles with tunable optical band gap

Chandni Khurana, O. P. Pandey, Bhupendra Chudasama

Journal of Sol-Gel Science and Technology > 2015 > 75 > 2 > 424-435

Visible light-responsive photocatalysts are the most promising candidates for green bioremediation processes that will degrade toxic organic industrial waste into harmless compounds. Among the photocatalysts, TiO₂ is best suited for large-scale photo-induced bioremediation processes mainly because of low cost and abundance. The major obstacle in its utilization as photocatalyst is its poor response...

article

Interaction Study of Yttria‐Based Glasses with High‐Temperature Electrolyte for SOFC

V. Kumar, O. P. Pandey, K. Singh, K. Lu

Fuel Cells > 14 > 4 > 635 - 644

The chemical interaction study of AO–SiO₂–B₂O₃–Y₂O₃ (A = Ba, Sr) (BaY, SrY) glass with high‐temperature electrolyte yttria‐stabilized zirconia (YSZ 8 mol%) is reported as a function of different heat treatment durations. The as‐prepared glass with 10 mol% of yttria shows limited amount of crystallization at 800 °C. Due to this yttria‐based glasses BaY and SrY have been chosen to make diffusion couples...

article

Antibacterial activity of silver: The role of hydrodynamic particle size at nanoscale

Chandni Khurana, Anjana K. Vala, Nidhi Andhariya, O. P. Pandey, more

Journal of Biomedical Materials Research Part B: Applied Biomaterials > 102 > 10 > 3361 - 3368

Silver shows the highest antimicrobial activities amongst all metals. It is better than many first line antibiotics. The antimicrobial properties of silver can be tuned by altering its physical and surface properties. Researchers have demonstrated enhancement in the antibacterial properties of silver with decreasing particle size from bulk to nano. In the present article, we study the effect of particle...

article

Carboxyester hydrolysis promoted by novel nano‐sized macrocyclic Zn(II) complexes

Sarvesh Kumar Pandey, O. P. Pandey, S. K. Sengupta

Applied Organometallic Chemistry > 28 > 9 > 681 - 687

A novel series of nano‐sized Zn(II) macrocyclic complexes has been synthesized using the template method, i.e. by the in situ reaction of Schiff bases (derived from 1,4‐bis(4‐amino‐5‐mercapto‐1,2,4‐triazol‐3‐yl)alkanes/phenylene with salicylaldehyde/2‐hydroxyacetophenone) and 1,4‐dibromobutane in the presence of zinc(II) acetate dihydrate in ethanol. The complexes have been characterized using elemental...

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Search results for: O. P. Pandey

Tribological properties of hybrid aluminium matrix composites reinforced with boron carbide and ilmenite particles for brake rotor applications

Infuence of heat treatment (routes) on the microstructure and mechanical properties of 300M ultra high strength steel

Effect of electroslag remelting and homogenization on hydrogen flaking in AMS-4340 ultra-high-strength steels

Ultrasonic P- and S-Wave Attenuation and Petrophysical Properties of Deccan Flood Basalts, India, as Revealed by Borehole Studies

Complexity in elucidating crustal thermal regime in geodynamically affected areas: A case study from the Deccan large igneous province (western India)

Janardan Ganapatirao Negi (1936-2016)

Seismically Derived Gondwana and Proterozoic Sediments East of Cuddapah Basin, South Indian Shield and Its Possible Geotectonic Implications

Optimization of High Conducting Na₃Zr₂Si₂PO₁₂ Phase by new Phosphate Salt for Solid Electrolyte

Anomalous Seismic Velocity Drop in Iron and Biotite Rich Amphibolite to Granulite Facies Transitional Rocks from Deccan Volcanic Covered 1993 Killari Earthquake Region, Maharashtra (India): a Case Study

Study of photocatalytic degradation of environmentally harmful phthalate esters using Ni-doped TiO₂ nanoparticles

Grain size distribution dependent magnetic and ferroelectric properties in sol–gel driven BiFeO₃ thin films

Brief report: Volume dependence of Grüneisen parameter for solids under extreme compression

Carbon Nanotubes and Cellulose Acetate Composite for Biomolecular Sensing

Mechanical, dielectric and optical assessment of glass composites prepared using milling technique

Thermal stability and structural properties of Ta nanopowder synthesized via simultaneous reduction of Ta₂O₅ by hydrogen and carbon

Preferential occupancy of Ca²⁺ dopant in La_1-xCa_xInO_3-δ (x = 0–0.20) perovskite: structural and electrical properties

Synthesis of visible light-responsive cobalt-doped TiO₂ nanoparticles with tunable optical band gap

Interaction Study of Yttria‐Based Glasses with High‐Temperature Electrolyte for SOFC

Antibacterial activity of silver: The role of hydrodynamic particle size at nanoscale

Carboxyester hydrolysis promoted by novel nano‐sized macrocyclic Zn(II) complexes

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