Search results for: Tarun Kumar

Items from 1 to 20 out of 386 results

article

SARS‐CoV‐2 and its variants of concern including Omicron: A never ending pandemic

Ranjan K. Mohapatra, Satwik Kuppili, Tarun Kumar Suvvari, Venkataramana Kandi, more

Chemical Biology & Drug Design > 99 > 5 > 769 - 788

The ongoing COVID‐19 pandemic caused by SARS‐CoV‐2 is associated with high morbidity and mortality. This zoonotic virus has emerged in Wuhan of China in December 2019 from bats and pangolins probably and continuing the human‐to‐human transmission globally since last two years. As there is no efficient approved treatment, a number of vaccines were developed at an unprecedented speed to counter the...

article

High‐performance thin‐layer chromatography based approach for bioassay and ATR–FTIR spectroscopy for the evaluation of antioxidant compounds from Asparagus racemosus Willd. aerial parts

Gouhar Jahan Ashraf, Priya Das, Tarun Kumar Dua, Paramita Paul, more

Biomedical Chromatography > 35 > 12 > n/a - n/a

Asparagus racemosus Willd. is widely used to combat various diseases owing to its medicinal properties. In this study, arial parts of A. racemosus were investigated for their total phenolic content, total flavonoid content and antioxidative potential. A high‐performance thin‐layer chromatography (HPTLC) method combined with effect‐directed‐analysis was also developed to screen the antioxidant effects...

article

Multi‐spurious harmonics suppression in folded hairpin line bandpass filter by meander spur‐line

Tarun Kumar Das, Sayan Chatterjee

International Journal of RF and Microwave Computer‐Aided Engineering > 31 > 11 > n/a - n/a

The present article exhibits the improvement in wide stopband harmonic suppression techniques of fourth‐order compact hairpin‐line Chebyshev type narrowband (4%) bandpass filter centered at 2.5 GHz by meander spur‐line. Initially, the compactness of 42% over the conventional hairpin‐line cell has been achieved by folding the open‐end arms of the hairpin line to folded hairpin‐line cell. Accordingly,...

article

Study on the role of tannic acid–calcium oxide adduct as a green heat stabilizer as well as reinforcing filler in the bio‐based hybrid polyvinyl chloride–thermoplastic starch polymer composite

Nipu Dutta, Shekharjyoti Hazarika, Tarun Kumar Maji

Polymer Engineering & Science > 61 > 9 > 2339 - 2348

In this study, we prepared a green heat stabilizer tannic acid–calcium oxide (TA–CaO) adduct in a green method and its efficacy was studied in a bio‐based polyvinyl chloride‐thermoplastic starch polymer matrix. The composite was prepared in a green pathway by melt mixing. CaO in the prepared complex also acted as a reinforcing filler in the composite. The addition of TA–CaO adduct in place of lead...

article

Emerging potential photovoltaic absorber hybrid halide perovskites (CH₃CH₂NH₃PbX₃; X = Br, Cl) materials: an ab‐initio calculation

Tarun Kumar Joshi, Giriraj Sharma, Rohit Agarwal, Ajay Singh Verma

International Journal of Energy Research > 45 > 10 > 15231 - 15244

To address the instability issues arising due to leaching of lead in the extensively explored MPX perovskite, in this study, we suggest replacement of the cation CH₃NH₃⁺ (M⁺) with a larger cation CH₃CH₂NH₃⁺ (E⁺). The proposed material EPX (CH₃CH₂NH₃PbX₃; X = Br, Cl), due to the larger size of E⁺ cation, is expected to offer increased hindrance to the movement of lead ions through the lattice and thereby...

article

Tuning the Regioselective Functionalization of Trifluoromethylated Dienes via Lanthanum‐Mediated Single C−F Bond Activation

Tarun Kumar, Yan Yang, Sirine Sghaier, Yassir Zaid, more

Chemistry – A European Journal > 27 > 12 > 4016 - 4021

The development of new fluorine‐containing building blocks and their efficient synthetic access is currently a challenging research field. Herein, the highly regio‐ and stereoselective addition of a large range of aldehydes onto trifluoromethylated benzofulvenes was achieved using a simple La/I₂/DIBAL‐Cl system via a selective C−F bond activation process. This versatile methodology provided homodienyl...

article

Analysis of cropping intensity and irrigation intensity in North Twenty Four Parganas district, West Bengal, India

Tarun Kumar Mondal, Santana Sarkar

Miscellanea Geographica. Regional Studies on Development > 2020 > 25 > 4 > 246-258

An attempt has been made in this paper to analyse the spatio-temporal variations of cropping intensity and irrigation intensity, and their relationship, in North Twenty Four Parganas district in West Bengal, India from 1996/97 to 2015/16. The relationship between cropping intensity and irrigation intensity has been assessed using partial correlation, residual mapping and hierarchical cluster analysis...

article

First‐principles spectroscopic screening of hybrid perovskite (CH₃CH₂NH₃PbI₃) with fundamental physical properties: A potential photovoltaic absorber

Tarun Kumar Joshi, Akash Shukla, Giriraj Sharma, Ajay Singh Verma

International Journal of Energy Research > 45 > 1 > 908 - 919

Herein, we have discussed the ethyl‐ammonium based hybrid perovskite (viz. CH₃CH₂NH₃PbI₃ or EAPbI₃) as the potential candidate material for the development of photovoltaic devices having low processing cost and high power conversion efficiency (PCE). To address the stability and environmental issues due to leaching of lead from MAPbI₃, we urge to replace cation CH₃NH₃⁺ (MA⁺) with an appropriate cation...

article

Preparation, characterization and cytotoxic applications of curcumin‐(±) α‐lipoic acid coloaded phosphorylated chitosan nanoparticles in MDA MB 231 breast cancer cell line

Plabita Gogoi, Anindita Dutta, Anand Ramteke, Tarun Kumar Maji

Polymers for Advanced Technologies > 31 > 11 > 2827 - 2841

In the present work, curcumin in combination with (±) α‐Lipoic acid were used as the active agents for the preparation of phosphorylated chitosan nanoparticle. Ionic gelation method was used for the successful fabrication of the nanoparticles. Effective incorporation of the drugs in the polymeric system was revealed by Fourier‐transform infrared spectroscopy (FT‐IR) and X‐ray diffractometry (XRD)...

article

Synthesis of Functionalized Arenopyrans and Arenylsulfanes via Reaction of Nitroallylic Acetates with Arenols and Arenethiols

Pallabita Basu, Robi Sikdar, Tarun Kumar, Irishi N. N. Namboothiri

European Journal of Organic Chemistry > 2020 > 33 > 5469 - 5470

article

Moringa oleifera methanolic leaves extract induces apoptosis and G0/G1 cell cycle arrest via downregulation of Hedgehog Signaling Pathway in human prostate PC‐3 cancer cells

Fahad Khan, Pratibha Pandey, Varish Ahmad, Tarun Kumar Upadhyay

Journal of Food Biochemistry > 44 > 8 > n/a - n/a

The inadequacy of effective treatment approaches for prostate cancer enlightens the crucial necessity for the search and emergence of novel and multitasking anticancer substances. Several experimental studies suggested the role of natural compounds in prostate cancer growth inhibition by Hedgehog signaling modulation. In the current study, we suggested the anticancer and apoptosis inducing effects...

article

Hydrogen bond interactions of hydrated aluminum nitrate with PVDF, PVDF‐TrFE, and PVDF‐HFP: A density functional theory‐based illustration

Ranjini Sarkar, Tarun Kumar Kundu

International Journal of Quantum Chemistry > 120 > 17 > n/a - n/a

Hydrogen bond (HB) interaction is the main driving factor for the nucleation of electroactive β phase within the nonpolar pristine polyvinylidene fluoride (PVDF) and its copolymers when the hydrated nitrate salts act as additives. The current work elaborates a density functional theory‐based analysis on the HB interactions within aluminum nitrate nonahydrate‐added polyvinylidene fluoride [PVDF/Al(NO...

article

Solitary precaval right renal artery

Esha Pai, Tarun Kumar

ANZ Journal of Surgery > 90 > 4 > 623 - 624

article

Design of low‐power high‐speed CNFET 1‐trit unbalanced ternary multiplier

Yogesh Shrivastava, Tarun Kumar Gupta

International Journal of Numerical Modelling: Electronic Networks, Devices... > 33 > 1 > n/a - n/a

Existing two‐level binary logic and MOSFET (metal oxide semiconductor field effect transistor) technology have limitations. To overcome the limitations, three levels ternary logic with CNFET (carbon nanotube field effect transistor) technology is introduced. In this paper, the 1‐trit ternary multiplier is reconfigured for wide applications using CNFET Stanford model, for low and high die temperature...

article

An investigation of solar flare effects on equatorial ionosphere and thermosphere using co-ordinated measurements

S. G. Sumod, Tarun Kumar Pant

Earth, Planets and Space > 2019 > 71 > 1 > 1-8

The response of equatorial ionosphere–thermosphere system to the X3.8 solar flare of January 17, 2005 has been studied using the coordinated measurements of GPS-derived Total Electron Content (TEC), OI 630.0 nm dayglow and magnetic field measurements over a dip equatorial station Trivandrum (8.5° N, 77° E, dip 0.5° N), in India. It has been observed that Equatorial Electrojet (EEJ) as inferred using...

article

Assessment of groundwater vulnerability to pollution by modified DRASTIC model and analytic hierarchy process

D. C. Jhariya, Tarun Kumar, H. K. Pandey, Sunil Kumar, more

Environmental Earth Sciences > 2019 > 78 > 20 > 1-20

Effective management of the groundwater resources became an important factor for the growth of urbanized areas, especially for the sector which has considerable agricultural and industrial activities. Along with quantity, assessment of the groundwater quality also plays an important role in its growth. Tandula watershed is one of the populated areas in the Balod district, Chhattisgarh state, which...

article

Genetic polymorphism in core promoter sequence of ACTRIIB gene and association analysis with growth traits in chicken

Pothanaboyina Guru Vishnu, Tarun Kumar Bhattacharya, Bharat Bhushan, Chandan Paswan, more

Reproduction in Domestic Animals > 54 > 10 > 1330 - 1340

Molecular breeding exploiting candidate genes is burgeoning reproductive approach to improve growth traits in poultry. The activin type IIB receptor (ACTRIIB) is a negative growth regulator, modulating action of many muscle growth regulators. PCR–single‐strand conformation polymorphism was employed to unravel polymorphism in promoter region of the ACTRIIB gene and delineate its association with growth...

article

Role of ZrO₂ Passivation Layer Thickness in the Fabrication of High‐Responsivity GaN Ultraviolet Photodetectors

Abhishek Chatterjee, Shailesh K. Khamari, Sanjay Porwal, Tarun Kumar Sharma

physica status solidi (RRL) – Rapid Research Letters > 13 > 10 > n/a - n/a

The importance of a ZrO₂ passivation layer in the fabrication of high‐responsivity GaN‐based ultraviolet (UV) photodetectors (PDs) is discussed. It is found that an optimum thickness of the ZrO₂ layer exists, which plays a critical role in controlling the photoresponse and transient response of the device. Beyond the optimal thickness, the performance of PDs deteriorates, which is limited by the...

article

Bond graph approach for dynamic modelling of the biped robot and application to obstacle avoidance

Rajmeet Singh, Tarun Kumar Bera

Journal of the Brazilian Society of Mechanical Sciences and Engineering > 2019 > 41 > 10 > 1-12

This paper deals with the modelling and obstacle avoidance of a biped robot. At first, the bond graph-based three-dimensional model of the biped is proposed. The robot walking scheme depends upon the oscillating cylinder mechanism. Two DC motors are actuating the prismatic leg of the robot. Then, bond graph model is converted into the Simulink block which is further used for obstacle avoidance application...

article

Periodicity Variation of Solar Activity and Cosmic Rays During Solar Cycles 22 – 24

Prithvi Raj Singh, C. M. Tiwari, S. L. Agrawal, Tarun Kumar Pant

Solar Physics > 2019 > 294 > 9 > 1-14

The solar radio flux at 2800 MHz (F10.7) and the sunspot number (SSN) are excellent indicators of solar activity. Data from 1986 to 2016 have been used to investigate long-term and mid-term periodicities of the F10.7 solar radio flux, the sunspot number, and galactic cosmic rays (GCRs) intensity, mainly from Oulu and Moscow, using fast Fourier Transform and Morlet wavelet techniques. The ≈ 148 days...

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INFONA - science communication portal

Search results for: Tarun Kumar

SARS‐CoV‐2 and its variants of concern including Omicron: A never ending pandemic

High‐performance thin‐layer chromatography based approach for bioassay and ATR–FTIR spectroscopy for the evaluation of antioxidant compounds from Asparagus racemosus Willd. aerial parts

Multi‐spurious harmonics suppression in folded hairpin line bandpass filter by meander spur‐line

Study on the role of tannic acid–calcium oxide adduct as a green heat stabilizer as well as reinforcing filler in the bio‐based hybrid polyvinyl chloride–thermoplastic starch polymer composite

Emerging potential photovoltaic absorber hybrid halide perovskites (CH₃CH₂NH₃PbX₃; X = Br, Cl) materials: an ab‐initio calculation

Tuning the Regioselective Functionalization of Trifluoromethylated Dienes via Lanthanum‐Mediated Single C−F Bond Activation

Analysis of cropping intensity and irrigation intensity in North Twenty Four Parganas district, West Bengal, India

First‐principles spectroscopic screening of hybrid perovskite (CH₃CH₂NH₃PbI₃) with fundamental physical properties: A potential photovoltaic absorber

Preparation, characterization and cytotoxic applications of curcumin‐(±) α‐lipoic acid coloaded phosphorylated chitosan nanoparticles in MDA MB 231 breast cancer cell line

Synthesis of Functionalized Arenopyrans and Arenylsulfanes via Reaction of Nitroallylic Acetates with Arenols and Arenethiols

Moringa oleifera methanolic leaves extract induces apoptosis and G0/G1 cell cycle arrest via downregulation of Hedgehog Signaling Pathway in human prostate PC‐3 cancer cells

Hydrogen bond interactions of hydrated aluminum nitrate with PVDF, PVDF‐TrFE, and PVDF‐HFP: A density functional theory‐based illustration

Solitary precaval right renal artery

Design of low‐power high‐speed CNFET 1‐trit unbalanced ternary multiplier

An investigation of solar flare effects on equatorial ionosphere and thermosphere using co-ordinated measurements

Assessment of groundwater vulnerability to pollution by modified DRASTIC model and analytic hierarchy process

Genetic polymorphism in core promoter sequence of ACTRIIB gene and association analysis with growth traits in chicken

Role of ZrO₂ Passivation Layer Thickness in the Fabrication of High‐Responsivity GaN Ultraviolet Photodetectors

Bond graph approach for dynamic modelling of the biped robot and application to obstacle avoidance

Periodicity Variation of Solar Activity and Cosmic Rays During Solar Cycles 22 – 24

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