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- 저자 : Amarendra Kumar (검색결과 2 건)
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Puja Kumari,Chandrashekhar Azad,Ravi Ranjan Kumar,Jyoti Kumari,Kumar Aditya,Amarendra Kumar 한국식물병리학회 2023 Plant Pathology Journal Vol.39 No.2
Spot blotch disease of wheat caused by Bipolaris sorokiniana (Sacc.) Shoem is considered as an economically important disease which affects all the growing stages of wheat crop. Therefore, it is important to search some effective management strategies against the spot blotch pathogen. Some synthetic elicitor compounds (salicylic acid, isonicotinic acid, and chitosan) and nano-particles (silver and aluminum) were tested against the pathogen to observe the change in biochemical activity and defense action of wheat plant against spot blotch disease. All the tested elicitor compounds and nano-particles showed a significant increase in activity of peroxidase, polyphenol oxidase (PPO), and total phenol over control. The highest increase in activity of peroxidase was recorded at 72 h from chitosan at 2 mM and 96 h from silver nano-particle at 100 ppm. Maximum PPO and total phenol activity were recorded from chitosan at 2 mM and silver nano-particle at 100 ppm as compared to pathogen-treated and healthy control. The lowest percent disease index, lowest no. of spots/leaf, and no. of infected leaves/plant were found in silver nano-particle at 100 ppm and chitosan at 2 mM, respectively. The use of defense inducer compounds results in significantly up-regulated enzymatic activity and reduced spot blotch disease. Therefore, chitosan and silver nanoparticle could be used as alternative methods for the management of spot blotch disease.
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Design and development of enhanced criticality alarm system for nuclear applications
Padi Srinivas Reddy,R. Amudhu Ramesh Kumar,M. Geo Mathews,G. Amarendra 한국원자력학회 2018 Nuclear Engineering and Technology Vol.50 No.5
Criticality alarm systems (CASs) are mandatory in nuclear plants for prompt alarm in the event of anycriticality incident. False criticality alarms are not desirable as they create a panic environment for radiationworkers. The present article describes the design enhancement of the CAS at each stage andprovides maximum availability, preventing false criticality alarms. The failure mode and effect analysisare carried out on each element of a CAS. Based on the analysis, additional hardware circuits aredeveloped for early fault detection. Two different methods are developed, one method for channel loopfunctionality test and another method for dose alarm test using electronic transient pulse. The designenhancement made for the external systems that are integrated with a CAS includes the power supply,criticality evacuation hooter circuit, radiation data acquisition system along with selection of differentsoft alarm set points, and centralized electronic test facility. The CAS incorporating all improvements areassembled, installed, tested, and validated along with rigorous surveillance procedures in a nuclear plantfor a period of 18,000 h.
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