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RISS 인기검색어
- 검색키워드
- 저자 : S V N Bhaskara Rao (검색결과 6 건)
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Design of Wideband Elliptical Ring Monopole Antenna Using Characteristic Mode Analysis
Bhaskara Rao Perli,Maheswara Rao Avula 한국전자파학회JEES 2021 Journal of Electromagnetic Engineering and Science Vol.21 No.4
This paper presents the systematic design of an elliptical ring monopole wideband antenna using characteristic mode analysis. The modal analysis is used to analyze the bandwidth and the radiation performance of the radiating patch. The resonance frequencies of three characteristic modes are close to each other with similar modal current distributions and characteristic fields. These three characteristic modes are simultaneously excited by an effective feeding technique. The proposed model achieves wideband characteristics. The proposed model is printed on an inexpensive FR4 substrate with a size of 20 mm × 18 mm × 1.6 mm and has a wide impedance bandwidth of 124.4% in the range of 3.6–15.46 GHz. The prototype has been fabricated and the measured results show good agreement with simulated results. The antenna will cover WLAN, WiMAX, Wi-Fi, and X-band applications.
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J. Bala Bhaskara Rao,V. Ramachandra Raju,B. B. V. L. Deepak 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.1
Most thermal/chemical industries are equipped with heat exchangers to enhance thermal efficiency. The performance of heat exchangers highly depends on design modifications in the tube side, such as the cross-sectional area, orientation, and baffle cut of the tube. However, these parameters do not exhibit a specific relation to determining the optimum design condition for shell and tube heat exchangers with a maximum heat transfer rate and reduced pressure drops. Accordingly, experimental and numerical simulations are performed for a heat exchanger with varying tube geometries. The heat exchanger considered in this investigation is a single-shell, multiple-pass device. A Generalized regression neural network (GRNN) is applied to generate a relation among the input and output process parameters for the experimental data sets. Then, an Artificial immune system (AIS) is used with GRNN to obtain optimized input parameters. Lastly, results are presented for the developed hybrid GRNN-AIS approach.
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Computational water management strategy of Tlawng River Basin using geo-informatics
Lalhmingliana,Ch.Udaya Bhaskara Rao,Goutam Saha 대한환경공학회 2020 Environmental Engineering Research Vol.25 No.5
Aizawl city is experiencing seasonal water scarcity. Tlawng is the longest River in Mizoram which flows for about 234 ㎞ length in Mizoram in south - north direction and joins the River Barak in Cachar district of Assam state. As Tlawng River is close to the Aizawl city, it will be wise to make some safe and durable strategy for storing rain water safely in predefined reservoirs and use it during hour of needs for domestic and agricultural purposes. In fact, Aizawl city is located within the Tlawng River basin at an average elevation of about 1,200 metres above mean sea level. An attempt has been made in this study for identification of feasible sites for construction of water reservoirs at appropriate locations based on the integration of thematic data on slope, flow accumulation, lithology, drainage density, lineament density and lineament direction using the advanced tools of ArcGIS software. Thirty two ideal sites have been identified in the vicinity of Aizawl city based on the multi-criteria evaluation of the thematic layers.
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Efficacy of Selenium on Silkworm (Bombyx mori L.) Cocoon Characters
( S. Smitha ),( K. Anil Kumar ),( A. Vijaya Bhaskara Rao ) 한국잠사학회 2006 International Journal of Industrial Entomology Vol.13 No.2
As the Selenium is known to be growth promoter in sheep and cattle, the efficacy of selenium has been tested in silkworm Bombyx mori L. The V ins tar larvae were fed with lethal and sub-lethal doses of selenium treated leaves. The larvae fed with lethal dose showed a significant decrease in growth and Cocoon commercial characters. The treatment with sub lethal dose exhibited a significant increase in the growth of the silkworm. Correspondingly, the cocoon commercial characters on exposure to the lethal dose showed significant decrease and sub lethal dose showed a significant increase. In the light of similar findings reported earlier in other cocoon crops and vertebrates, it can be inferred that selenium at lower doses acts as a growth stimulator, resulting in the higher yield of cocoon crop.
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Efficacy of Selenium on Silkworm (Bombyx mori L.) Cocoon Characters
Smitha S.,Kumar K. Anil,Rao, A. Vijaya Bhaskara Korean Society of Sericultural Science 2006 International Journal of Industrial Entomology Vol.13 No.2
As the Selenium is known to be growth promoter in sheep and cattle, the efficacy of selenium has been tested in silkworm Bombyx mori L. The V instar larvae were fed with lethal and sub-lethal doses of selenium treated leaves. The larvae fed with lethal dose showed a significant decrease in growth and Cocoon commercial characters. The treatment with sub lethal dose exhibited a significant increase in the growth of the silkworm. Correspondingly, the cocoon commercial characters on exposure to the lethal dose showed significant decrease and sub lethal dose showed a significant increase. In the light of similar findings reported earlier in other cocoon crops and vertebrates, it can be inferred that selenium at lower doses acts as a growth stimulator, resulting in the higher yield of cocoon crop.
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Electron-Electron Interactions based Metal-Insulator Transition in Ga Doped ZnO Thin Films
R V Muniswami Naidu,A Subrahmanyam,A Verger,M K Jain,S V N Bhaskara Rao,S N Jha,D M Phase 대한금속·재료학회 2012 ELECTRONIC MATERIALS LETTERS Vol.8 No.4
We report on the charge carrier transport mechanisms of undoped and Ga doped (2 wt. % and 4 wt. %)ZnO thin films grown by pulsed dc magnetron sputtering technique. Temperature dependent resistivity measurements showed typical semiconducting behaviour for undoped ZnO thin films where as Ga doped ZnO thin films showed metallic nature at higher temperatures and insulating nature with a metal to insulator transition at lower temperatures. The observed transition temperatures are 91 K and 140 K for 2 wt. % and 4 wt. %Ga doped ZnO films respectively. The observed metal insulator transition is attributed to the electron-electron interactions at low temperatures. The variations in the transition temperatures are explained based on the disorderness induced in the system due to the doping effect. ZnO doped with 4 wt. % Ga showed the lowest resistivity of 5.7 × 10−4Ω cm with a carrier concentration of 1.2 × 1021/cm3. Undoped and doped ZnO thin films are about 90% transparent in the visible region. Blue shift is observed in the absorption edge with the effect of doping and it is explained based on B-M shift. The Fermi level measured from valance band spectroscopy showed a shift of +0.6 eV for 2 wt. % Ga doped ZnO thin film and +0.7 eV for 4 wt. %Ga doped ZnO thin film compared to the Fermi edge of undoped ZnO thin films. This ascertains the movement of Fermi level in to the conduction band with the effect of doping.
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