579 research outputs found
Oblique propagation of E.M. wave in magnetized quantum plasma with two different spin states
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Synthesis and biological evaluation of Schiff bases and azetidinones of 1-naphthol
No full textIntroduction: Schiff bases and azetidinones form an important structural class possessing wide spectrum of biological activities that include antibacterial and antifungal activity. A series of Schiff′s bases N′-(substituted benzylidene)-2-(naphthalen-1-yloxy) acetohydrazides (3a-f) and azetidinones N-[3-chloro-2-oxo-4-(substituted phenyl)-azetidin-1-yl]-2-(naphthalen-1-yloxy) acetamides (4a-b) were synthesized and tested for antimicrobial activity. Materials and Methods: The chemical structures of synthesized compounds were elucidated on the basis of IR and 1H NMR spectroscopy. The synthesized compounds were screened for antibacterial activity against E. coli (ESS 2231) and B. subtilis (MTCC 441). The compounds were also tested for antifungal activity against A. niger (NCIM 618) and C. albicans (NCIM 3557) by the cup diffusion method. Results and Discussion: The in vitro antimicrobial activity results showed that the N-[3-chloro-2-oxo-4-(4-substitutedphenyl)-azetidin-1-yl]-2-(naphthalen-1-yloxy) acetamides (4a-b) exhibited better antibacterial activity than the synthesized N′-(substituted benzylidene)-2-(naphthalen-1-yloxy)-acetohydrazides (3a-f). Compound (4b) displayed potent antibacterial activity against the B. subtilis and E. coli (MIC values of 16-64 μg/mL). The antifungal activity of the synthesized compounds (3a-f and 4a-b) against the A. niger and C. albicans was relatively weak, most of the compounds showed poor activities (MIC >128μg/mL). Conclusion: The antibacterial activity of the synthesized compounds was moderate to low and antifungal activity was relatively weak. Therefore, a further study with this class of compounds is necessary to elucidate the mechanism and structure activity relationship
Topology of Disordered Networks and their Applications
No full textThis eBook is a collection of articles from a Frontiers Research Topic. Frontiers Research Topics are very popular trademarks of the Frontiers Journals Series: they are collections of at least ten articles, all centered on a particular subject. With their unique mix of varied contributions from Original Research to Review Articles, Frontiers Research Topics unify the most influential researchers, the latest key findings and historical advances in a hot research area! Find out more on how to host your own Frontiers Research Topic or contribute to one as an author by contacting the Frontiers Editorial Office: frontiersin.org/about/contac
Topology of Disordered Networks and their Applications
No full textThis eBook is a collection of articles from a Frontiers Research Topic. Frontiers Research Topics are very popular trademarks of the Frontiers Journals Series: they are collections of at least ten articles, all centered on a particular subject. With their unique mix of varied contributions from Original Research to Review Articles, Frontiers Research Topics unify the most influential researchers, the latest key findings and historical advances in a hot research area! Find out more on how to host your own Frontiers Research Topic or contribute to one as an author by contacting the Frontiers Editorial Office: frontiersin.org/about/contac
Three phase AC to AC Z-source converter
No full textME. EIEDWith the increasing research in power converters, there is a thrust on finding the solution to obtain a more efficient buck-boost converter which can transfer AC to AC directly with the minimal component requirement. For this the concept of impedance source converter is used. A Z-source network has an advantage over traditional converters like voltage source (V-source), current source (I-source) and push-pull converters that it can operate in shoot-through state which helps to boost the output voltage.
The simulation work for three phase AC to AC Z-source converter has been carried out and the results are verified mathematically. The converter has some limitations like maximum obtainable boost factor is 1.15. This limitation is eliminated in improved topology having twelve bidirectional switches. Though the number of switches required in improved topology is doubled, the maximum obtainable boost factor is very high (in our case boost factor obtained is 1.8). In the thesis work a thorough analysis and comparison of the two converters are presented. Both converters voltage sag and swell capabilities are verified by simulation and mathematical results. State space averaging technique for mathematical modelling of both the converters. The closed loop analysis of the two converters is tried and simulation results are presented in support of that.
Further, frequency control is also possible in both the converters which is not presented in this thesis.EIED,Thapar Universit
Unravelling the Tapestry: Quantum Physics, Biocentrism, and Indian Philosophy
No full textIn the intricate dance between the scientific and the metaphysical, the realms of quantum physics, biocentrism, and Indian philosophy converge, offering profound insights into the nature of reality. This article embarks on a journey to explore the interconnected threads that weave through these seemingly distinct domains, revealing a tapestry that challenges our understanding of existence
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