17 results on '"Qasim, Mohd"'
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2. APPROXIMATION BY GENERALIZED SZÁSZ--MIRAKJAN--KANTOROVICH TYPE OPERATORS.
- Author
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Qasim, Mohd, Mursaleen, M., Abbas, Zaheer, and Khan, Asif
- Abstract
We construct Kantorovich variant of generalized Szász-Mirakjan operators whose construction depends on a continuously differentiable, increasing and unbounded function τ. For these new operators we give weighted approximation, Voronovskaya type theorem, quantitative estimates for the local approximation. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
3. A new construction of Lupaş operators and its approximation properties.
- Author
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Qasim, Mohd, Khan, Asif, Abbas, Zaheer, and Cai, Qing-Bo
- Subjects
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CONSTRUCTION , *POSITIVE operators , *GENERALIZATION , *SMOOTHNESS of functions - Abstract
The aim of this paper is to study a new generalization of Lupaş-type operators whose construction depends on a real-valued function ρ by using two sequences u m and v m of functions. We prove that the new operators provide better weighted uniform approximation over [ 0 , ∞) . In terms of weighted moduli of smoothness, we obtain degrees of approximation associated with the function ρ. Also, we prove Voronovskaya-type theorem, quantitative estimates for the local approximation. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
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4. Thermoresponsive polymer gated and superparamagnetic nanoparticle embedded hollow mesoporous silica nanoparticles as smart multifunctional nanocarrier for targeted and controlled delivery of doxorubicin.
- Author
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Asghar, Khushnuma, Qasim, Mohd, Dharmapuri, Gangappa, and Das, Dibakar
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MESOPOROUS silica , *SILICA nanoparticles , *THERMORESPONSIVE polymers , *TARGETED drug delivery , *NANOCOMPOSITE materials , *HELA cells - Abstract
The design and development of drug-delivery nanocarriers with high loading capacity, excellent biocompatibility, targeting ability and controllability have been the ultimate goal of the biomedical research community. In this work, we have reported the synthesis and characterization of novel and smart thermoresponsive polymer coated and Fe3O4 embedded hollow mesoporous silica (HmSiO2) based multifunctional superparamagnetic nanocarriers for the delivery of doxorubicin (Dox) for cancer treatment. P(NIPAM-MAm) coated and Fe3O4 nanoparticle (NP) embedded hollow mesoporous silica nanocomposite (HmSiO2-F-P(NIPAM-MAm)) was prepared by the in situ polymerization of NIPAM and MAm monomers on the surface of hollow mesoporous silica NPs (HmSiO2) in the presence of Fe3O4 NPs, oxidizer and crosslinker. TEM analysis showed nearly spherical morphology of HmSiO2-F-P(NIPAM-MAm) nanocarrier with a diameter in the range of 100–300 nm. The coating of P(NIPAM-MAm) layer and embedding of Fe3O4 NPs on the surface of the HmSiO2 NPs was revealed by HRTEM analysis. XRD and FTIR analysis also confirmed the presence of P(NIPAM-MAm) shells and Fe3O4 NPs on hollow mesoporous silica NPs. VSM analysis suggested the superparamagnetic nature of HmSiO2-F-P(NIPAM-MAm) nanocarrier. DSC analysis of HmSiO2-F-P(NIPAM-MAm) nanocarrier showed a phase transition at the temperature of ∼38 °C. The prepared HmSiO2-F-P(NIPAM-MAm) nanocarrier was investigated for its suitability for drug-delivery application using doxorubicin as the model drug by an in vitro method. The encapsulation efficiency and encapsulation capacity were found to be 95% and 6.8%, respectively. HmSiO2-F-P(NIPAM-MAm)-Dox has shown a pH and temperature-dependent Dox release profile. A relatively faster release of Dox from the nanocarrier was observed at temperature above the lower critical solution temperature (LCST) than below the LCST. HmSiO2-F-P(NIPAM-MAm) nanocarrier was found to be biocompatible in nature. In vitro cytotoxicity studies against Hela cells suggested that the HmSiO2-F-P(NIPAM-MAm)-Dox nanocomposite nanocarrier has good anticancer activity. In vitro cellular uptake study of HmSiO2-F-P(NIPAM-MAm)-Dox nanocomposite nanocarrier demonstrated its good internalisation ability into Hela cells. Thus, the prepared nanocomposites show potential as nanocarrier for targeted and controlled drug delivery for cancer treatment. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
5. Stancu type q-Bernstein operators with shifted knots.
- Author
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Mursaleen, M., Qasim, Mohd, Khan, Asif, and Abbas, Zaheer
- Subjects
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GENERALIZATION , *KNOT theory , *CONTINUITY , *RATES - Abstract
In the present paper, Stancu type generalizations of the q-analog of Lupaş Bernstein operators with shifted knots are introduced. Some approximation results and rate of convergence for these operators are investigated. A Voronovskaja type theorem and local approximation results for the mentioned operators are studied. The extra parameters γ, δ, q, a and b provide more flexibility for approximation. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
6. Synthesis and characterization of neem gum coated superparamagnetic nanoparticle based novel nanobiocomposite.
- Author
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Asghar, Khushnuma, Qasim, Mohd, and Das, Dibakar
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NEEM , *TARGETED drug delivery , *CANCER cell growth , *TRANSMISSION electron microscopy , *MAGNETIC properties , *POLYSACCHARIDES - Abstract
Uses of biopolymers for the development of nanocarriers are receiving significant attention due to its biocompatible and biodegradable nature. Neem (Azadirachta indica) is a well known medicinal plant and it is reported that the polysaccharides and limonoids present in the neem extract prevent the growth and proliferation of cancer cells. In this work, we have synthesized neem gum (NG) coated Fe 3 O 4 nanoparticles (NPs) based novel nanobiocomposite (Fe 3 O 4 @NG NBC) by simple sonochemical method and characterized it for structural, microstructural and magnetic properties. The morphology, structure, and magnetic properties of the prepared Fe 3 O 4 NPs and Fe 3 O 4 @NG nanobiocomposite were investigated by X-ray diffractometer (XRD), Fourier-transform infrared (FTIR), Transmission electron microscopy (TEM), thermogravimetric analysis (TGA) and vibrating sample magnetometer (VSM) analysis. XRD pattern, TEM micrograph and FTIR spectra confirmed the successful coating of neem gum on Fe 3 O 4 nanoparticles. IR spectra of Fe 3 O 4 @NG nanobiocomposite revealed the presence of specific bands corresponding to both neem gum and Fe 3 O 4 NPs, which confirmed the formation of Fe 3 O 4 @NG NBC. The obtained size of Fe 3 O 4 @NG nanobiocomposite particles was ∼50–400 nm. VSM analysis confirmed the superparamagnetic nature of both Fe 3 O 4 NPs and Fe 3 O 4 @NG nanobiocomposite. Fe 3 O 4 @NG nanobiocomposite was loaded with anticancer drug doxorubicin (Dox) and its release behaviour was studied at pH 7.4 and 5. Faster release of Dox was observed in acidic environment. In vitro cytotoxicity of the prepared Fe 3 O 4 @NG NBC against human monocytic cell line THP‐1 was also studied by MTT assay. This novel Fe 3 O 4 @NG nanobiocomposite with low toxicity, biodegradability, water dispersability, excellent drug loading ability and good magnetic controllability could offer potential applications in biomedical field including targeted drug delivery for cancer diagnosis and treatment in near future. [ABSTRACT FROM AUTHOR]
- Published
- 2019
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7. Preparation and characterization of CoFe2O4 and CoFe2O4@Albumen nanoparticles for biomedical applications.
- Author
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Qasim, Mohd, Asghar, Khushnuma, and Das, Dibakar
- Subjects
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FAST Fourier transforms , *MAGNETIC nanoparticles , *TARGETED drug delivery , *IRON oxide nanoparticles , *NANOPARTICLES , *ALBUMINS - Abstract
Biopolymer coated magnetic nanoparticles are becoming extremely popular in the fields of biomedical research because of their enormous applications potentials. In this work, first, CoFe 2 O 4 nanoparticles (CF NPs) of two distinct sizes have been prepared following co-precipitation method by varying the synthesis parameters and characterized. XRD, SAED and IFFT (Inverse Fast Fourier Transformed) assisted HRTEM analyses confirmed the successful formation of monodispersed spinel cubic CoFe 2 O 4 nanoparticles. Particles size of CF NPs was found to increase with increase in the amount of reducing agent. Synthesized CF NPs was coated with an egg albumen matrix by a facile and environmental friendly method to form biocompatible CoFe 2 O 4 @Albumen nanocomposite nanoparticle (CF@Alb NP). Prepared CoFe 2 O 4 and CoFe 2 O 4 @Albumen nanoparticles were examined for its structure, morphology, thermal stability and magnetic nature employing powder XRD, HRTEM, TGA, FTIR and VSM techniques. Low as well as high magnification TEM analyses have shown coating of amorphous albumen on crystalline CF NPs. It was observed that CF@Alb NP is composed of many smaller CF NPs engulfed in the albumen matrix forming a nano-aggregate of size ∼80–130 nm. IFFT analysis of HRTEM micrograph showed presence of crystalline CF NPs in amorphous albumen matrix. Further, TGA and FTIR results also suggested the successful coating of albumen on CF NPs. CF@Alb NP has shown a very good Dox loading ability with loading efficiency of ∼93%. A promising pH dependent Dox release behavior was observed. Dox release kinetics has also been studied using different mathematical models. Biocompatibility of the CF@Alb NP has been tested against the human monocytic cell line THP-1. This novel CF@Alb NP could have a great potential in biomedical applications, particularly in hyperthermia and targeted drug delivery. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
8. Synthesis and Characterization of Magnetically controllable Multifunctional mSiO2@Ag-Fe3O4@P(Nipam) nanocomposite.
- Author
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Qasim, Mohd, Asghar, Khushnuma, and Das, Dibakar
- Subjects
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THERMORESPONSIVE polymers , *MESOPOROUS silica , *INTELLIGENT agents , *MAGNETIC properties , *ANTI-infective agents , *OXIDIZING agents - Abstract
In this work, Ag and Fe3O4 NPs embedded and P(Nipam) coated mesoporous silica (mSiO2@Ag-Fe3O4@P(Nipam) NC) based magnetically controllable and thermoresponsive nanocomposite has been synthesized and characterized for structural, microstructural and magnetic properties. First, mSiO2-Ag-Fe3O4 NC was prepared by simple sol gel process using Ag NPs, Fe3O4 NPs, TEOS, and CTAB. mSiO2@Ag-Fe3O4@P(Nipam) NC was prepared by in situ coating of P(Nipam) on the surface of mSiO2@Ag-Fe3O4 in the presence of oxidizer and crosslinker. TEM and FTIR analysis confirm the presence of AgNPs and Fe3O4 NPs in silica nanosphere and reveal the coating of P(Nipam) polymer. This smart nanocomposite could be very useful as intelligent antimicrobial agent and for targeted chemo-photothermal therapy. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
9. Facile Development of Superparamagnetic Nanoparticle Encapsulated Protein based Nanocarrier for Targeted Drug Delivery Application.
- Author
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Asghar, Khushnuma, Qasim, Mohd, and Das, Dibakar
- Subjects
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TARGETED drug delivery , *MAGNETIC measurements , *SERUM albumin , *CHEMICAL stability , *MAGNETIC properties - Abstract
In this work, facile development of superparamagnetic Fe3O4 nanoparticle encapsulated bovine serum albumin (BSA) based nanocarrier (Fe3O4@BSA) for targeted drug delivery application has been reported. First, highly monodisperse and well crystalline superparamagnetic Fe3O4 nanoparticle was prepared and then a green and simple sonochemical method was used for the development of Fe3O4@BSA nanocarrier. The structural, morphological, and magnetic properties of the prepared Fe3O4@BSA nanocarrier have been studied by XRD, TEM, SAED, FTIR and VSM techniques. The particle sizes of Fe3O4 nanoparticle and Fe3O4@BSA nanocarrier were found to be 5-10 nm and 50-300 nm respectively. TEM micrographs and FTIR analysis confirmed the successful coating of amorphous BSA on crystalline Fe3O4 NPs. Magnetic measurement revealed the superparamagnetic nature of the prepared Fe3O4@BSA nanocarrier. Fe3O4@BSA nanocarrier with smaller particle sizes, good physical and chemical stability, excellent water dispersability and low toxicity could have potential for targeted drug delivery applications. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
10. Facile Synthesis of Fe3O4 and multifunctional Fe3O4@Albumen Nanoparticles for Biomedical Applications.
- Author
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Qasim, Mohd, Asghar, Khushnuma, and Das, Dibakar
- Subjects
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IRON oxide nanoparticles , *IRON oxide synthesis , *BIOMEDICAL materials , *TRANSMISSION electron microscopy , *SURFACE coatings - Abstract
In this work two different sizes of Fe3O4 nanoparticles (NPs) have successfully been synthesized by changing reaction parameter. Prepared Fe3O4 NPs have been characterized for its structural, morphological, and magnetic properties by using XRD, FESEM, TEM, SAED and VSM techniques. XRD and SAED patterns confirmed the formation of cubic phase Fe3O4 NPs. Crystallite sizes estimated using the Debye-Scherrer equation of both prepared Fe3O4 NPs using less (S1) and more (S2) NaBH4 were found to be ~9 and ~18 nm respectively. Both TEM and FESEM results suggested nearly spherical and random morphology of both S1 and S2 prepared Fe3O4 NPs with average particles sizes of 22 and 27 nm respectively. VSM result revealed superparamagnetic nature of the prepared Fe3O4 NPs. In the last section of this work, prepared Fe3O4 NPs have successfully been coated with albumen to form biocompatible multifunctional Fe3O4@Alb nanoparticle. These Fe3O4@Alb NPs may find potential applications in targeted drug delivery due to its magnetic tunability, biocompatibility and inexpensiveness. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
11. One-Pot Green Synthesis of Carbon Quantum Dot for Biological Application.
- Author
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Asghar, Khushnuma, Qasim, Mohd, and Das, D.
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QUANTUM dots , *BIOMEDICAL materials , *TRANSMISSION electron microscopy , *PARTICLE size determination , *CHEMICAL synthesis - Abstract
A one-pot microwave assisted method for synthesizing carbon quantum dots (CQDs) from honey is presented in this paper. The structural, morphological and optical properties of synthesized CQDs were characterized by XRD, TEM, UV-Vis spectrophotometer, and Raman techniques. The average particle size of CQDs is found to be 2 to 7 nm. The main advantage of this work is the use of inexpensive, less toxic and environmental friendly precursors and synthesis procedure for CQDs. In addition to this, the particle size of prepared CQDs was found to be ultrafine with narrow size distribution. The as-prepared CQDs, with smaller particle size, good stability, good optical properties, water dispersibility and low toxicity, show promising potential for applications in biomedical field. [ABSTRACT FROM AUTHOR]
- Published
- 2017
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12. Magnetically recyclable Ni0.5Zn0.5Fe2O4/Zn0.95Ni0.05O nano-photocatalyst: Structural, optical, magnetic and photocatalytic properties.
- Author
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Qasim, Mohd, Asghar, Khushnuma, Singh, Braj Raj, Prathapani, Sateesh, Khan, Wasi, Naqvi, A.H., and Das, Dibakar
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NICKEL compounds , *RECYCLABLE material , *PHOTOCATALYSTS , *MOLECULAR structure , *OPTICAL properties of metals , *MAGNETIC properties of metals - Abstract
A novel visible light active and magnetically separable nanophotocatalyst, Ni 0.5 Zn 0.5 Fe 2 O 4 /Zn 0.95 Ni 0.05 O (denoted as NZF@Z), with varying amount of Ni 0.5 Zn 0.5 Fe 2 O 4 , has been synthesized by egg albumen assisted sol gel technique. The structural, optical, magnetic, and photocatalytic properties have been studied by powder X-ray diffraction (XRD), transmission electron microscopy (TEM), field emission scanning electron microscopy (FESEM), fourier transform infrared spectroscopy (FTIR), UV–visible (UV–Vis) spectroscopy, and vibrating sample magnetometry (VSM) techniques. Powder XRD, TEM, FTIR and energy dispersive spectroscopic (EDS) analyses confirm coexistence of Ni 0.5 Zn 0.5 Fe 2 O 4 and Zn 0.95 Ni 0.05 O phases in the catalyst. Crystallite sizes of Ni 0.5 Zn 0.5 Fe 2 O 4 and Zn 0.95 Ni 0.05 O in pure phases and nanocomposites, estimated from Debye–Scherrer equation, are found to be around 15–25 nm. The estimated particle sizes from TEM and FESEM data are ∼(22 ± 6) nm. The calculated energy band gaps, obtained by Tauc relation from UV–Vis absorption spectra, of Zn 0.95 Ni 0.05 O, 15%NZF@Z, 40%NZF@Z and 60%NZF@Z are 2.95, 2.72, 2.64, and 2.54 eV respectively. Magnetic measurements (field (H) dependent magnetization (M)) show all samples to be super-paramagnetic in nature and saturation magnetizations (M s ) decrease with decreasing ferrite content in the nanocomposites. These novel nanocomposites show excellent photocatalytic activities on Rhodamin Dye. [ABSTRACT FROM AUTHOR]
- Published
- 2015
- Full Text
- View/download PDF
13. Polyaniline/CoFe2O4 nanocomposite inhibits the growth of Candida albicans 077 by ROS production.
- Author
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Khan, Javed Alam, Qasim, Mohd, Singh, Braj Raj, Khan, Wasi, Das, Dibakar, and Naqvi, Alim H.
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POLYANILINES , *CANDIDA albicans , *NANOCOMPOSITE materials , *OPTOELECTRONICS , *MEDICAL research , *POLYMERIZATION , *THERMAL properties - Abstract
Abstract: In recent years, polyaniline/CoFe2O4 nanocomposites have gained attention because of their wide utilization in optoelectronics and biomedical studies. However, very limited research has been carried out on the anticandidal activity of polyaniline/CoFe2O4 nanocomposite against Candida spp. Thus, the study was designed to investigate the anticandidal potential of PANI/CoFe2O4 nanocomposite against Candida albicans 077. PANI/CoFe2O4 nanocomposite (denoted as “cfPNCs”) was synthesized by polymerization of aniline in the presence of CoFe2O4 nanoparticles. The structural and thermal properties of the synthesized PANI/CoFe2O4 nanocomposite were investigated. It was noteworthy that PANI/CoFe2O4 nanocomposite showed promising anticandidal activity in a dose-dependent manner. Results also showed that the protection of histidine (a ROS quencher) against ROS clearly suggested the implication of ROS in anticandidal activity of PANI/CoFe2O4 nanocomposite. It is encouraging to conclude that PANI/CoFe2O4 nanocomposite bears the potential of their applications in biomedicine, especially nanotherapy for diseases caused by C. albicans. [Copyright &y& Elsevier]
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- 2014
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14. Synthesis and characterization of structural, optical, thermal and dielectric properties of polyaniline/CoFe2O4 nanocomposites with special reference to photocatalytic activity.
- Author
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Khan, Javed Alam, Qasim, Mohd, Singh, Braj Raj, Singh, Sneha, Shoeb, Mohd, Khan, Wasi, Das, Dibakar, and Naqvi, Alim H.
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POLYANILINES synthesis , *OPTICAL properties of nanocomposite materials , *EFFECT of temperature on nanocomposite materials , *DIELECTRIC properties of nanocomposite materials , *PHOTOCATALYSIS , *PATHOLOGICAL physiology - Abstract
Highlights: [•] PANI/CoFe2O4 nanocomposites (PANI@CF-1:1 and 1:2) have been successfully synthesized. [•] Nanocomposites properties modified by the addition of varying amount of the CoFe2O4 NPs into the PANI. [•] Nanocomposite (PANI@CF-1:2) showed the photocatalysis of MO dye via production of ROS. [Copyright &y& Elsevier]
- Published
- 2013
- Full Text
- View/download PDF
15. Convergence of Generalized Lupaş-Durrmeyer Operators.
- Author
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Qasim, Mohd, Mursaleen, Mohammad, Khan, Asif, and Abbas, Zaheer
- Subjects
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BETA functions - Abstract
The main aim of this paper is to establish summation-integral type generalized Lupaş operators with weights of Beta basis functions which depends on μ having some properties. Primarily, for these new operators, we calculate moments and central moments, weighted approximation is discussed. Further, Voronovskaya type asymptotic theorem is proved. Finally, quantitative estimates for the local approximation is taken into consideration. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
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16. Approximation by Generalized Lupaş Operators Based on q-Integers.
- Author
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Qasim, Mohd, Mursaleen, M., Khan, Asif, and Abbas, Zaheer
- Subjects
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ESTIMATES , *CONSTRUCTION , *DIFFERENTIABLE dynamical systems - Abstract
The purpose of this paper is to introduce q-analogues of generalized Lupaş operators, whose construction depends on a continuously differentiable, increasing, and unbounded function ρ. Depending on the selection of q, these operators provide more flexibility in approximation and the convergence is at least as fast as the generalized Lupaş operators, while retaining their approximation properties. For these operators, we give weighted approximations, Voronovskaja-type theorems, and quantitative estimates for the local approximation. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
17. Approximation by modified Lupaş operators based on (p; q)--integers.
- Author
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Khan, Asif, Abbas, Zaheer, Qasim, Mohd, and Mursaleen, M.
- Subjects
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INTEGERS , *QUANTUM operators , *DIOPHANTINE approximation - Abstract
The purpose of this paper is to introduce a new modification of Lupas operators in the frame of post quantum setting and to investigate their approximation properties. First using the relations between q-calculus and post quantum calculus, the post quantum analogue of operators constructed will be linear and positive but will not follow Korovkin's theorem. Hence a new modification of q-Lupas operators is constructed which will preserve test functions. Based on these modification of operators, approximation properties have been investigated. Further, the rate of convergence of operators by mean of modulus of continuity and functions belonging to the Lipschitz class as well as Peetre's K-functional are studied. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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