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Browsing by Author "Kumar, D."

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Antibacterial and cellular response of piezoelectric Na0.5K0.5NbO3modified 1393 bioactive glass

Verma, A.S.; Kumar, D.; Dubey, A.K. (Elsevier Ltd, 2020-11)

In the present study, the combined effect of addition of varying concentrations (10–30 vol%) of biocompatible piezoelectric Na0.5K0.5NbO3 (NKN) as well as electrostatic and dynamic pulsed electrical treatment on antibacterial ...
Crystallization and microstructural behaviour of strontium titanate borosilicate glass ceramics with Bi2O3 addition

Thakur, O.P.; Kumar, D.; Parkash, O.M.; Pandey, L. (Indian Academy of Sciences, 1997)

Glasses in the system (65 - x) [SrO · TiO2]-(35) [2SiO2 · B2O3]-(x) [Bi2O3] where x = 1,5,10 (wt%) prepared by melting in alumina crucible (1375-1575 K), were subjected to different heat treatment schedules followed by DTA ...
Crystallization behavior and microstructural analysis of lead-rich (P b x S r 1 - X) TiO 3 glass ceramics containing 1mole L a 2 O 3

Gautam, C.R.; Kumar, D.; Parkash, O. (2011)

Solid solution of perovskite Pb,SrTiO3 in Pb-rich composition can be crystallized in borosilicate glassy matrix. The addition of rare earth and transition metal oxides is known to influence the crystallization behavior and ...
Designing environment-friendly chromium-free Spinel-PericlaseZirconia refractories for Ruhrstahl Heraeus degasser

Mandal, S.; Dileep Kumar, C.J.; Kumar, D.; Syed, K.; Van Ende, M.-A.; Jung, I.-H.; Finkeldei, S.C.; Bowman, W.J. (Blackwell Publishing Inc., 2020-12)

Ruhrstahl Heraeus (RH) degassers are globally used to manufacture vacuum-treated steel for automotive and railroad applications. The state-of-the-art environment-friendly chromium-free alternatives for direct-bonded ...
Development of enzymatic biodiesel from vegetable oil and quantification of fatty acid Butyl Esters

Kumar, D.; Verma, B. (Rasayan Journal of Chemistry, c/o Dr. Pratima Sharma, 2018-03)

Biodiesel was produced by enzymatic transesterification of soybean oil with isobutanol esterifying agent and Lipase (Pseudomonas cepacia) as a biocatalyst. Fourier transform infrared spectroscopy (Thermo-Nicolet mode 5700) ...
Dielectric behaviour of glasses and glass ceramics in the system BaO-PbO-TiO2-B2O3-SiO2

Mandal, R.K.; Prasad, Ch.D.; Parkash, O.M.; Kumar, D. (Springer India, 198-11)

Glasses with varying molar ratios of PbO/BaO in the system BaO-PbO-TiO2-B2O3-SiO2 were prepared keeping (BaO + PbO)/TiO2 ratio equal to one. The glasses were ceramized by two-stage heat treatment. X-ray diffraction indicates ...
Dielectric properties of the system Ca1 -x La x Ti1 -x Co x O3

Durga Prasad, C.; Tewari, H.S.; Kumar, D.; Parkash, O. (Springer India, 1988-12)

Dielectric behaviour of samples of the system Ca1 -x La x Ti1 -x Co x O3 with x ≤ 0·20 has been studied in the temperature range 300-525 K as a function of frequency. The strong dispersion of e{open} and D observed in these ...
Effect of 1 wt% CoO addition on dielectric and microstructural behaviour of (SrO·TiO2)-(2SiO2·B2O 3) glass and glass ceramic

Thakur, O.P.; Kumar, D.; Parkash, O.M.; Pandey, L. (Indian Academy of Sciences, 1996)

Glass of the nominal composition 64wt%(SrO·TiO2)-35 wt%(2SiO2·B2O3)-1 wt%(CoO) was prepared. The glass samples were subjected to heat treatment at 900 and 950°C. The phase progression in these glass ceramics from X-ray ...
Effect of 1 wt% CoO addition on dielectric and microstructural behaviour of (SrO·TiO2)-(2SiO2·B2O 3) glass and glass ceramic

Thakur, O.P.; Kumar, D.; Parkash, O.M.; Pandey, L. (Indian Academy of Sciences, 1996)

Glass of the nominal composition 64wt%(SrO·TiO2)-35 wt%(2SiO2·B2O3)-1 wt%(CoO) was prepared. The glass samples were subjected to heat treatment at 900 and 950°C. The phase progression in these glass ceramics from X-ray ...
Effect of Bi3+ ion on upconversion-based induced optical heating and temperature sensing characteristics in the Er3+/Yb3+ co-doped La2O3 nano-phosphor

Yadav, R.S.; Kumar, D.; Singh, A.K.; Rai, E.; Rai, S.B. (Royal Society of Chemistry, 2018)

The upconversion-based optical heating and temperature sensing characteristics are investigated in the Er3+/Yb3+/Bi3+ tri-doped La2O3 nano-phosphor synthesized through a solution combustion method. The structural measurements ...
Effect of composition on dielectric and electrical properties of the Sr1-xLaxTi1-xCoxO3 system

Upadhyay, S.; Kumar, D.; Parkash, O. (Indian Academy of Sciences, 1996)

Valence compensated perovskite system Sr1-xLaxTi1-xCoxO3 shows dielectric relaxor behaviour with very high value of dielectric constant in the composition range 0.20 < x < 0.40. In this paper the effect of composition on ...
Effect of host on the radiative (upconversion emission) as well as non-radiative relaxation (laser induced optical heating) in Tm3+/Yb3+ co-doped phosphors

Dwivedi, A.; Kumar, D.; Rai, S.B.; Rai, A.K. (Elsevier B.V., 2020-10)

Tm3+/Yb3+ co-doped YVO4 (YVO:Tm, Yb); GdVO4 (GVO:Tm, Yb); Y2O3 (YO:Tm, Yb); Gd2O3 (GdO:Tm, Yb) and CaAl2O4 (CAO:Tm, Yb) phosphor samples have been synthesized using high temperature Solid State Reaction method. X-ray ...
Effect of Synthesis Techniques on the Optical Properties of Ho 3+ /Yb 3+ Co-doped YVO 4 Phosphor: A Comparative Study

Dwivedi, A.; Rai, E.; Kumar, D.; Rai, S.B. (American Chemical Society, 2019-04-16)

The Ho 3+ /Yb 3+ -codoped YVO 4 phosphors have been synthesized by three different techniques (viz., solution combustion, sol-gel, and solid-state reaction techniques). X-ray diffraction patterns confirm the formation of ...
Electrical conduction in the solid solution La1 -x Na x Co1 -x Nb x O3 (0·01 ≤x ≤ 0·99)

Parkash, O.M.; Kumar, D.; Kumar, R. (Springer India, 1988-05)

Scebeek coefficient and DC resistivity of the solid solution Lal _~Na~Col _~Nb~O3 (001 ~< x <~0-99) have been measured in the temperature range 300-900 K. Seebeck coefficient is positive for all compositionsover the ...
Electrical conduction in the solid solution La1 -x Na x Co1 -x Nb x O3 (0·01 ≤x ≤ 0·99)

Parkash, O.M.; Kumar, D.; Kumar, R. (Springer India, 1988-05)

Seebeck coefficient and DC resistivity of the solid solution La1 -x Na x Co1 -x Nb x O3 (0·01 ≤x ≤ 0·99) have been measured in the temperature range 300-900 K. Seebeck coefficient is positive for all compositions over the ...
Electrical conduction in the solid solution La1 -x Na x Co1 -x Nb x O3 (0·01 ≤x ≤ 0·99)

Parkash, O.M.; Kumar, D.; Kumar, R. (Springer India, 1988-05)

Seebeck coefficient and DC resistivity of the solid solution La1 -x Na x Co1 -x Nb x O3 (0·01 ≤x ≤ 0·99) have been measured in the temperature range 300-900 K. Seebeck coefficient is positive for all compositions over the ...
Electrical properties of the system lanthanum lead cobalt titanium oxide

Kumar, D.; Prasad, Ch.D.; Parkash, O. (Springer India, 1987-06)

Measurements of DC electrical resistivity and Seebeck coefficient on the perovskite system La1-x Pb x-δ Co1-x Ti x O3-δ for 0·2≤x≤0·9 have been made in the temperature range 300-800 K. AC conductivity, σ a.c, of all the ...
Elliptical and circular step-index fibers with conducting helical windings on the core-cladding boundaries for different winding pitch angles - A comparative modal dispersion analysis

Kumar, D.; Singh II, O.N. (2005)

The propagation characteristics of an elliptical step-index fiber with a conducting helical winding on the core-cladding boundary are investigated analytically and compared with those of a circular step index fiber with a ...
Enhanced multimodal behaviour of Tm3+/Yb3+ co-doped YTaO4 ceramic material through Bi3+ activation and sensitization: Application as a spectral converter

Roy, A.; Dwivedi, A.; Kumar, D.; Mishra, H.; Rai, S.B. (Elsevier Ltd, 2020-11)

The multimodal [Upconversion (UC), Downshifting (DS) and Quantum cutting (QC)] behaviour of Tm3+/Yb3+ co-doped YTaO4 ceramic material is investigated extensively. The samples are prepared by solid-state reaction method at ...
Eosin Y-Catalyzed Synthesis of 3-Aminoimidazo[1,2- a]Pyridines via the HAT Process under Visible Light through Formation of the C-N Bond

Singh, H.K.; Kamal, A.; Kumari, S.; Kumar, D.; Maury, S.K.; Srivastava, V.; Singh, S. (American Chemical Society, 2020)

A comfortable, environment-friendly, and metal-free approach for synthesizing the biologically important moiety aminoimidazopyridine through the multicomponent reaction of benzylamine, 2-aminopyridine, and t-butyl isocyanide ...

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