Browsing by Author "Kunal Singh"

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A Novel Hybrid Islanding Detection Technique for PV-Battery DC Microgrid
(Institute of Electrical and Electronics Engineers Inc., 2025) Kunal Singh; Avirup Maulik; Mitresh Kumar Verma; Soumya R. Mohanty
A hybrid islanding detection technique for a DC microgrid is presented in this paper, in which a novel passive index (cumulative product of superimposed voltage) is proposed for disturbance identification in the first stage (passive). The second (active) stage discriminates between islanding and nonislanding disturbances and is activated if the proposed passive index exceeds a threshold. The computation of the proposed passive index is simple, requiring only voltage measurements, making the proposed approach fast and easily implementable. Simulation studies verify that the proposed technique can successfully discriminate between islanding and non-islanding events, quickly detect islanding under zero power mismatch scenarios, and improve power quality. © 2025 IEEE.
Phycocyanin extracted from oscillatoria minima shows antimi-crobial, algicidal, and antiradical activities: In silico and in vitro analysis
(Bentham Science Publishers, 2020) Vaishali C. Venugopal; Abhimanyu Thakur; Latha K. Chennabasappa; Gaurav Mishra; Kunal Singh; Parth Rathee; Anjali Ranjan
Background: Phycocyanin is an algae-derived protein, which binds to pigment for harvesting light. It has been reported in various different species, including that of red algae, dinoflagellates, and cryptophyta. Importantly, phycocyanin has enormous applica-tions, including cosmetic colorant, food additive, biotechnology, diagnostics, fluorescence detection probe, an anticancer agent, anti-inflammatory, immune enhancer, etc. In addition, several different algae were utilized for the isolation of cyano-phycocyanin (C-PC), but most of the purification methods consist of several steps of crude extraction. Aim: To isolate C-PC from a new source of microalgae with better purity level and to evaluate its antimicrobial, algicidal, and antiradical activities. Methods: Biological activity, permeability, pharmacokinetics, and toxicity profile of C-PC were predicted by in silico studies. C-PC was purified and isolated by using ammonium sulphate precipitation, ion-exchange chromatography and gel-filtration chromatography. C-PC was characterized by SDS-PAGE and elution profile (purity ratio) analysis. Antimi-crobial and algicial activities of C-PC were evaluated by the microtitre plate based assays. Antiradical activity of C-PC was evaluated by DPPH-and ABTS*+ radical scavenging as-says. Conclusion: C-PC was extracted from Oscillatoria minima for the first time, followed by its quantitative as well qualitative evaluation, indicating a new alternative source of this important protein. Furthermore, the antimicrobial, algicidal, and antiradical activities of the isolated C-PC extract have been demonstrated by both in silico as well as in vitro methods. © 2020 Bentham Science Publishers.
RETRACTED ARTICLE: Long-Term Safety Analysis of the BBV152 Coronavirus Vaccine in Adolescents and Adults: Findings from a 1-Year Prospective Study in North India (Drug Safety, (2024), 47, 12)
(Adis, 2024) Upinder Kaur; Aakanksha Jaiswal; Ayushi Jaiswal; Kunal Singh; Aditi Pandey; Mayank Chauhan; Mahek Rai; Sangeeta Kansal; Kishor Patwardhan; Vaibhav Jaisawal; Sankha Shubhra Chakrabarti
The Editor has retracted this article as he no longer has confidence in the conclusions as stated in the article. Post-publication review concluded that the reported adverse events of special interest (AESIs) were presented in a way that could lead to ambiguous or incorrect interpretations regarding the relationship with the BBV152 vaccine. Given these findings, the editor and the publisher have decided that this article should be removed on public health grounds. The authors disagree with this retraction. © The Author(s)