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Effect of Sintering Temperature on the Micro Strain and Magnetic Properties of Ni-Zn Nanoferrites
D. Venkatesh,M. Siva Ram Prasad,B. Rajesh Babu,K. V. Ramesh,K. Trinath 한국자기학회 2015 Journal of Magnetics Vol.20 No.3
In this study, nanocrystalline ferrite powders with the composition Ni0.5Zn0.5Fe₂O₄ were prepared by the autocombustion method. The obtained powders were sintered at 800℃, 900℃ and 1,000℃ for 4 h in air atmosphere. The as-prepared and the sintered powders were characterized by X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, and magnetization studies. An increase in the crystallite size and a slight decrease in the lattice constant with sintering temperature were observed, whereas microstrain was observed to be negative for all the samples. Two significant absorption bands in the wave number range of the 400 cm<SUP>?1</SUP> to 600 cm<SUP>?1</SUP> have been observed in the FT-IR spectra for all samples which is the distinctive feature of the spinel ferrites. The force constants were found to vary with sintering temperature, suggesting a cation redistribution and modification in the unit cell of the spinel. The M-H loops indicate smaller coercivity, which is the typical nature of the soft ferrites. The observed variation in the saturation magnetization and coercivity with sintering temperature has been attributed to the role of surface, inhomogeneous cation distribution, and increase in the crystallite size.
Development of New Productive Bivoltine Silkworm (Bombyx mori L.) Hybrid, APS83 X APS102
M. Ramesh Babu,H. Lakshmi,J. Prasad,J. Seetharamulu,Chandrashekharaiah 한국잠사학회 2005 International Journal of Industrial Entomology Vol.11 No.1
Successful silkworm breeding attempts were made at Andhra Pradesh State Sericulture Research and Development Institute (APSSRDI), Hindupur, India in developing productive bivoltine silkworm hybrids.One hundred hybrid combinations involving 10 parents (five each of oval and peanut) were evaluated in complete diallel pattern and identified the combination APS83 × APS102 as most promising. This hybrid showed economic merit for the characters fecundity (524 eggs/laying), pupation percentage (96.0%), cocoon yield per 10,000 larvae by weight (19.0 kg), cocoon weight (1.85 g), shell weight (41.7 cg), shell ratio (22.5%), filament length (1,004 m), reelability (88.4%),raw silk recovery (18.4%) and neatness (92 point) over the control hybrid APS9 × APS8. The breeding process and identification of APS83 × APS102 is discussed in the paper.
Combining Ability of Diallel Crosses of Bivoltine Silkworm, Bombyx mori L.
Babu M. Ramesh,Chandrashekharaiah Chandrashekharaiah,Lakshmi H.,Prasad J.,Goel A. K. Korean Society of Sericultural Science 2005 International Journal of Industrial Entomology Vol.10 No.1
General and specific combining ability effects of six bivoltine breeds of silkworm (Bombyx mori L.) were evaluated for six quantitative characters through diallel method wherein parents, $F_{1}s$ and reciprocals are involved. The breeds $APS_{11}\;and\;APS_{2}$ were found to be the best general combiners for most of the traits studied. The high estimates of specific combining ability (sca) variance (${\sigma}^{2}s$) compared to general combining ability (gca) variance (${\sigma}^{2}g$) indicated the predominant role of non-additive gene action in the control of all the characters. Positive sca effects for majority of the traits were expressed by the combinations $APS_{13}{\times}APS_6,\;APS_{13}{\times}APS_2,\;APS_{11}{\times}APS_6\;and\;APS_5{\times}APS_2$ out of 15 crosses. Among the 15 reciprocal crosses studied, the combination $APS_8{\times}APS_{13}$ showed positive reciprocal effects for all the six traits. With both the parents $APS_5\;and\;APS_2$ being good general combiners the hybrid $APS_5{\times}APS_2$ showing high sca effects is recommended for commercial use.
M. Amuthasurabi,J. Chandradass,V Ramesh Babu,P.Baskara Sethupathi,M. Leenus Jesu Martin 한양대학교 세라믹연구소 2017 Journal of Ceramic Processing Research Vol.18 No.11
We report on the performance of the thin film transistors (TFTs) using ZnO as an active channel layer grown by using radio frequency (rf) magnetron sputtering technique. The TFT device structure used in this study was a bottom gate type, which consists of SiNx as a gate insulator and indium tin oxide (ITO) as a gate deposited onto corning glass substrates. Electrical characteristics of the device showed clear saturation region without any output current degradation due to self heating effect. These ZnO TFTs had a saturation field effect mobility of about 2.14 cm2/Vs, an on to off ratio of greater than 105, the off current of less than 10−10 A and a threshold voltage of 15 V at a maximum device processing temperature of 350 oC. This TFT had a channel width of 300 μm and channel length of 30 μm. Moreover, the SiNx dielectric layer was found to be optimum for the high performance ZnO based TFTs because of the very low leakage current and good interface between the channel layer and gate material.
Ramesh Babu M.,Lakshmi H.,Prasad J.,Seetharamulu Seetharamulu,Chandrashekharaiah J. Korean Society of Sericultural Science 2005 International Journal of Industrial Entomology Vol.11 No.1
Successful silkworm breeding attempts were made at Andhra Pradesh State Sericulture Research and Development Institute (APSSRDI), Hindupur, India in developing productive bivoltine silkworm hybrids. One hundred hybrid combinations involving 10 parents (five each of oval and peanut) were evaluated in complete diallel pattern and identified the combination APS$_{83}$ $\times$ APS$_{102}$ as most promising. This hybrid showed economic merit for the characters fecundity (524 eggs/laying), pupation percentage (96.0$\%$), cocoon yield per 10,000 larvae by weight (19.0 kg), cocoon weight (1.85 g), shell weight (41.7 cg), shell ratio (22.5$\%$), filament length (1,004 m), reelability (88.4$\%$), raw silk recovery (18.4$\%$) and neatness (92 point) over the control hybrid APS$_{9}$ $\times$ APS$_{8}$ The breeding process and identification of APS$_{83}$ $\times$ APS$_{102}$ is discussed in the paper.
Development of New Productive Bivoltine Silkworm (Bombyx mori L.) Hybrid, APS83×APS102
( M. Ramesh Babu ),( H Lakshmi ),( J. Prasad ),( J. Seetharamulu ),( Chandrashekharaiah ) 한국잠사학회 2005 International Journal of Industrial Entomology Vol.11 No.1
Successful silkworm breeding attempts were made at Andhra Pradesh State Sericulture Research and Development Institute (APSSRDI), Hindupur, India in developing productive bivoltine silkworm hybrids. One hundred hybrid combinations involving 10 parents (five each of oval and peanut) were evaluated in complete diallel pattern and identified the combination APS83×APS102 as most promising. This hybrid showed economic merit for the characters fecundity (524 eggs/laying), pupation percentage (96.0%), cocoon yield per 10,000 larvae by weight (19.0 kg), cocoon weight (1.85 g), shell weight (41.7 cg), shell ratio (22.5%), filament length (1,004 m), reelability (88.4%), raw silk recovery (18.4%) and neatness (92 point) over the control hybrid APS9×APS8. The breeding process and identification of APS83×APS102 is discussed in the paper.
M. Ramesh Babu,C. Venkatesh Kumar,S. Anitha 대한전기학회 2021 Journal of Electrical Engineering & Technology Vol.16 No.1
The losses in the distribution networks due to the line resistance decrease the overall effi ciency of the power distribution. Reducing the power losses and regulating the voltages within the limits are necessary to provide quality power to the consumers. The power loss can be minimized by optimum network reconfi guration and the placement of the capacitors. Considering independent network reconfi guration and placement of the capacitor is not eff ective during heavy loading conditions. This paper proposes a simultaneous network reconfi guration and capacitor placement in radial distribution network to minimize the real power losses, operating cost and to improve the bus voltages. The Johnson’s algorithm is used to fi nd the minimal spanning tree during the network reconfi guration and an adaptive whale optimization algorithm is used as an optimization method. The proposed methodology is tested on standard IEEE 33-bus and 69-bus radial distribution systems. The eff ectiveness of the proposed method is validated by comparing the results with previous result reported in the literature in terms of cost saving and loss reduction
Breeding of New Productive Bivoltine Hybrid, CSR12×CSR6 of Silkworm Bombyx mori L.
( R. K. Datta ),( H. K. Basavaraja ),( N. Mal Reddy ),( S. Nirmal Kumar ),( N. Suresh Kumar ),( M. Ramesh Babu ),( M. M. Ahsan ),( K. P. Jayaswal ) 한국잠사학회 2001 International Journal of Industrial Entomology Vol.3 No.2
With an objective of evolving quantitatively and qualitatively superior bivoltine breeds/hybrids of silkworm Bombyx mori L. for tropical conditions, breeding work was initiated in Central Sericultural Research and Training Institute, Mysore during 1992 by utilizing two Japanese hybrids namely BNl8×BCS25 and Shunrei×Shogetsu along with Indian evolved breed, KA. The breed CSR12 which is characterized with sex-limited larval marking and white oval cocoons was evolved from the Japanese hybrid BNl8×BCS25 by crossing with KA, while the breed CSR6 which is characterized with normal marking (marked larvae) and white dumbbell cocoons was extracted from the Japanese commercial hybrid Shunrei×Shogetsu through continuous inbreeding coupled with selection. After fixation, these breeds along with other newly evolved breeds were subjected to hybrid study under optimum environmental conditions in the laboratory for expression of full potential of the genotypes. These hybrids were evaluated by Multiple Trait Evaluation Index (Mano et al., 1993). The hybrid CSR12×CSR6 was selected based multiple trait evaluation index value. The hybrid CSR12×CSR6 recorded survival of 96.0%, shell weight of 50.0 cg, shell ratio of 24.3%, raw silk percentage of 19.6, filament length of 1,216 m, boil off loss of 22.4% and renditta of 5.1. On the other hand, the control hybrid (KA×NB4D2) has recorded survival of 90.6%, shell weight of 42.1 cg, shell ratio of 20.4%, raw silk percentage of 15.9, filament length of 999 m, boil off loss of 24.8% and renditta of 6.3. The hybrid CSR12×CSR6 was authorized during 1997 by Central Silk Board, Government of India for commercial exploitation during favourable months based on national level race authorization test.