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A Novel MEMS Microheater Based Alcohol Gas Sensor using Nanoparticles
V. S. Selvakumar,L. Sujatha,R. Sundar 대한전자공학회 2018 Journal of semiconductor technology and science Vol.18 No.4
This work reports the simulation of nanoparticle coated MEMS based Alcohol Gas Sensor analysis with various parameters like power consumption, temperature uniformity, resistance change, sensitivity and selectivity. It is achieved by measuring the change in resistance when gas is exposed over the sensing layer. This instantaneous response in detection of gases helps in various application such as breath analyzer in vehicles, breath analyzer, food quality control etc. The gas sensor employs a mesh type poly silicon micro-hotplate structure. The sensor holds a very thin conducting film made of titanium which detects the presence of ethyl alcohol vapors on it. The temperature generated by the hot-plate influences various factors such as the conductance of the film and the quantity of a particular gas adsorbed on it. When sensor film is bring to the right boiling point temperature it evaporates residual vapor particles. For effective sensing of alcohol gas, we optimize the supply voltage (around 3 Volts) and the uniform temperature profile of the micro heater was analyzed (619.29 K) along with sensitivity and selectivity. For the gas sensing analysis, we have compared the sensitivity of thin film coating of ZnO, TiO₂, and SnO. The design was simulated by means of joules heating, thermal expansion and Electric current FEM simulation.
( T. Selvakumar ),( B. Nataraju ),( K. Chandrasekharan ),( S. D. Sharma ),( M. Balavenkatasubbaiah ),( P. Sudhakara Rao ),( V. Thiagarajan ),( S. B. Dandin ) 한국잠사학회 2005 International Journal of Industrial Entomology Vol.11 No.1
While observing silkworm larval samples received from field, microsporidian spores formed within the haemocytes of silkworm haemolymph were observed. The spores of microsporidian sp. were purified and characterized for morphological characters viz., size, shape as well as serological affinity with different Nosema spp. (M11 and M12). The infectivity of the isolated spores to silkworm was also studied. The microsporidian sp. was found to be highly pathogenic to silkworm, B. mori. The isolated microsporidian sp. was designated as NIK-5hm, which formed ovocylindrical spore in the haemocytes of silkworm and differed in spore size (length, 4.55 μm & width, 2.10 μm) and shape from Nosema bombycis (NIK-1s), NIK-2r (Nosema sp. Mysore [3.6 & 2.8 μm]), NIK-3h (Nosema sp. M11 [3.8 & 1.8 μm]), NIK-4m (Nosema sp. M12 [5.0 & 2.1 μm]) and Lb㎳ (Nosema sp. in Lamerine breed of silkworm [4.36 & 2.14]). In immonological test (Latex agglutination test), the isolated microsporidian spores did not react with antibody sensitized latex particles of N. bombycis, M11, M12 and Lb㎳ and thus are different type of microsporidian sp., parasitic to silkworm, Bombyx mori L.
Selvakumar T.,Nataraju B.,Chandrasekharan K.,Sharma S. D.,Balavenkatasubbaiah M.,Sudhakara Rao P.,Thiagarajan V.,Dandin S. B. Korean Society of Sericultural Science 2005 International Journal of Industrial Entomology Vol.11 No.1
While observing silkworm larval samples received from field, microsporidian spores formed within the haemocytes of silkworm haemolymph were observed. The spores of microsporidian sp. were purified and characterized for morphological characters viz., size, shape as well as serological affinity with different Nosema spp. (M$_{11}$ and M$_{12}$). The infectivity of the isolated spores to silkworm was also studied. The microsporidian sp. was found to be highly pathogenic to silkworm, B. mori. The isolated microsporidian sp. was designated as NIK-5hm, which formed ovocylindrical spore in the haemocytes of silkworm and differed in spore size (length, 4.55 $\mu$m & width, 2.10 $\mu$m) and shape from Nosema bombycis (NIK-ls), NIK-2r (Nosema sp. Mysore [3.6 & 2.8 $\mu$m]), NIK-3h (Nosema sp. M$_{11}$ [3.8 & 1.8 $\mu$m]), NIK-4m (Nosema sp. M$_{12}$ [5.0 & 2.1 $\mu$m]) and Lb$_{ms}$ (Nosema sp. in Lamerine breed of silkworm [4.36 & 2.14]). In immonological test (Latex agglutination test), the isolated microsporidian spores did not react with antibody sensitized latex particles of N. bombycis, M$_{11}$, M$_{12}$ and Lb$_{ms}$ and thus are different type of microsporidian sp., parasitic to silkworm, Bombyx mori L.
G. Suneel,S. Rajasekaran,J. Selvakumar,Chetan P. Kaushik,J.K. Gayen,K.V. Ravi 한국원자력학회 2019 Nuclear Engineering and Technology Vol.51 No.3
Vitrification of radioactive liquid waste (RLW) provides a feasible solution for isolating radionuclidesfrom the biosphere for an extended period. In vitrification, base glass and radioactive waste are addedsimultaneously into the melter. Determination of heat and mass transfer rates is necessary for rationaldesign and sizing of melter. For obtaining an assured product quality, knowledge of reaction kineticsassociated with the thermal decomposition of waste constituents is essential. In this study Thermogravimetry(TG) - Differential Thermogravimetry (DTG) of eight kinds of nitrates and two oxides, whichare major components of RLW, is investigated in the temperature range of 298e1273 K in the presence ofbase glasses of five component (5C) and seven component (7C). Studies on thermal behavior of constituentsin RLW were carried out at heating rates ranging from 10 to 40 K min 1 using TG e DTG. Thermal behavior and related kinetic parameters of waste constituents, in the presence of 5C and 7C baseglass compositions were also investigated. The activation energy, pre-exponential factor and order of thereaction for the thermal decomposition of 24% waste oxide loaded glasses were estimated using Kissingermethod
K. Jeyasubramanian,G.S. Hikku,A.V.M. Preethi,V.S. Benitha,N. Selvakumar 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.37 No.-
Superhydrophobicity on the cotton fabric was accomplished by coating a mixture of polyvinyl chloride,copper stearate and Fe2O3/Cr2O3 nanoparticles. Firm attachment of copper stearate and the nanoparticles on the surface of cotton was achieved by employing polyvinyl chloride solution as the binder. The non-wettable nature of the surface modified cotton fabrics were evaluated through WCAmeasurement, which exhibited superhydrophobic nature for nano Fe2O3 (147.58) and Cr2O3 (151.18)impregnated cotton. Moreover, the surface roughness contributing towards the enhancement of WCA oncotton was indirectly evaluated by coating a thin film over a glass surface utilizing the same additiveswas reported through AFM.
Palanisamy R.,Karthikeyan D.,Vidyasagar S.,Kalyanasundaram V.,Selvakumar K.,Vijayakumar K.,Selvabharathi D. 대한전기학회 2021 Journal of Electrical Engineering & Technology Vol.16 No.4
In this paper, three phase four wire fi ve level Neutral Point Clamped Inverter (NPCI) based Static synchronous Compensator (STATCOM) is implemented for reactive power control and neutral current elimination. Three dimensional Space Vector Pulse Width Modulation (3D-SVPWM) control strategy is developed to control this 5-level NPC inverter. The behaviour of static synchronous compensator is analyzed and reactive power control is done using constant DC voltage. The objective of this compensating method is to provide balanced and sinusoidal source currents under unbalanced and nonlinear load conditions and reactive power control. The 3D-SVPWM technique provides reduced harmonic content in output voltage and current, controlled source current, minimized common mode voltage and improved output voltage. In 3D-SVPWM, switching pulses are generated with non-redundant switching states, which lead to reduce the complexity in switching time calculation and computational time is less. The highlights of the paper includes the neutral current is reduced to 0.25A, source current harmonics is minimized and it provides balanced and sinusoidal source currents with help of STATCOM compensation. The simulation and experimental results demonstrates the sinusoidal and harmonics free source current and minimized neutral current for four wire fi ve level NPCI based STATCOM.
A Practical Technology for Diagnosis and Management of Diseases in Silkworm Rearing
Nataraju, B.,Balavenkatasubbaiah, M.,Sharma, S.D.,Selvakumar, T.,Thiagarajan, V. Korean Society of Sericultural Science 2002 International Journal of Industrial Entomology Vol.4 No.2
A practical technology for silkworm disease management at farmer\\`s level was suggested and test verified for its efficacy and adaptability. The technology consisted of disinfection of rearing house and appliances, early disease diagnosis, personal and rearing hygiene and silkworm body and rearing seat disinfection. Besides, the supportive techniques associated in disease management are cited. The validation trials of the technology involving 845 farmers crops with 147,530 disease free layings (dfls) of CSR bivoltine hybrids confirmed the effectiveness of the technology which resulted an average yield of 68.98 kg cocoons/100 dfls.