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RISS 인기검색어
- 검색키워드
- 저자 : Anand B. C. (검색결과 3 건)
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Application of SRCBD S: SnO2 nanostructured thin films as room temperature gas and humidity sensors
Anand B. C.,Shashidhar R.,Choudhary Nityanand 한국물리학회 2023 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.82 No.4
The flms were synthesized by the Substrate Rotation Chemical Bath Deposition method and have been characterized by various techniques. It is found that stoichiometry and band gap of SnO2 and S: SnO2 can be controlled moderately by air annealing as-deposited flms and substrate temperature strongly afects the surface morphology. The comparative chemiresistive performance of flms was studied for sensing applications of test gases and humidity. The sensitivity and relative sensor response of 5 ppm ethanol at room temperature were better than other test gases. The flms annealed in air at 300, 400 and 450 °C for 1 h have excellent responses towards propanol, ethanol, and acetone, respectively. In general, the fgure of merit of the synthesized gas sensor is found to vary from 2.8 to 24%, respectively. Annealed flms at 350 °C for one hour have ultrahigh response towards humidity. Response-recovery time was found to vary as a function of annealing temperature due to the decrement in sensor impedance. Selectivity of the gas sensor for test gases was found to reach its maximum due to variation of S S+Sn from 0.088 to 0.011. SRCBD has been reported to fabricate gas-humidity sensors economically with better steady and stable responses. The MOS sensor has shown ultrahigh humidity response and reasonable response at a low ppm of acetone gas at room temperature, which may be suitable as acetone breath analysis for seriously diabetic patients.
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Vellingiri, B.,Shanmugam, S.,Subramaniam, M.D.,Balasubramanian, B.,Meyyazhagan, A.,Alagamuthu, K.,Prakash, V.,Shafiahammedkhan, M.,Kathannan, S.,Pappuswamy, M.,Raviganesh, B.,Anand, S.,Shahnaz N, D.,C Academic Press 2014 Ecotoxicology and environmental safety Vol.100 No.-
Ionizing radiation (IR) is known as a classical mutagen capable of inducing various kinds of stable and unstable chromosomal aberrations (CA) including the possibility of increasing the incidence of DNA damage. This study aims to assess occupationally induced CA in workers chronically exposed to low doses of IR in Radiology (RL), Cardiology (CL) and Orthopedic (OL) Laboratories in hospitals of Tamil Nadu. We performed the analysis of CA by trypsin G-banding, micronucleus (MN) assay, Comet assay and Xenobiotic-metabolizing gene polymorphisms (GSTM1, GSTT1 and GSTP1) in 56 exposed and 56 control subjects who were matched for gender and age (+/-2 years). Higher degree of CA and MN frequencies were observed in exposed groups, especially in CL subjects compared to other exposed groups and controls (p<0.05). Higher frequency of DNA tail length and tail moment was observed in the CL exposed subjects compared to the RL and OL subjects. The frequencies of GSTM1 and GSTT1 null genotypes were 39.3 percent and 14.3 percent, respectively. No significant difference in allele frequencies between exposed subjects and controls were observed (p=0.0128). Using multiple linear regression analysis, statistical significance was determined for work duration and age for the CL, RL and OL workers and the examination of the possible impact by confounding factors showed few significant influences on the radiation exposure, as a specific biomarker. However, the findings from the present study suggest that, awareness should be created among the personnel exposed to radiations in hospital laboratories, highlighting the necessity of applying radiation protection principles against medical radiation exposure.
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Arur Anand,G. Kantharajan,P. Krishnan,K. Abdul Hakeem,K. Sai Santosh,Ch. Srinivasa Rao,Kuldeep K. Lal,S. B. Choudhury,C. Manjulatha,D. E. Babu 대한공간정보학회 2019 Spatial Information Research Vol.27 No.6
Planning aquaculture and fisheries activities in a reservoir requires knowledge of dynamics of water spread. We studied water spread dynamics of three reservoirs in the Godavari river basin, India using multi-temporal satellite imagery for the period 1990–2018 and developed a framework for mapping the spatial extent of water spread area (WSA) having potential for enclosure fish culture. The study showed that WSA of Nizamsagar reservoir in premonsoon season has declined from 108.11 to 99.34 km2 from phase I (1990–2006) to phase II (2007–2018), respectively and a similar trend was seen in Pocharam and Nallavagu reservoirs. For post monsoon seasons of the same time period, an increase in WSA was seen in Nizamsagar (133.75–144.14 km2) and Pocharam reservoirs (14.15-14.67 km2). Based on frequency of water presence during 2007–2018, WSA with potential for cage and pen culture was determined in Nizamsagar (31.04 km2) and Pocharam (2.87 km2) reservoirs. The study showed that both the reservoirs can accommodate maximum allowed number of cages (5000 and 500 cages respectively). We provide a decision matrix for location-specific selection of suitable culture methods and candidate species, which would aid in optimal utilization of the hitherto under-utilized reservoirs, especially in in situ data poor conditions. This study can be scaled up in the entire country with the help of academia/industry to prioritize reservoirs with potential for enclosure fish culture and plan appropriate interventions for reducing their yield gap.
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