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Krishna Kishore Mugada,Kumar Adepu 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.8
Understanding the flow of plasticized material during friction stir welding was critical for producing quality welds. The toolgeometry such as shoulder and pin designs play a significant role in altering the material flow characteristics. In the presentinvestigation, scroll shoulder design with varying pins were addressed in the aspects of tool axial force, material flow andmechanical properties. Marker insert method was used to study the flow of plasticized material with copper as inserts. Theresults show that the pin geometry variation has showed a significant change in the axial force plot in the welding phase. The taper cylindrical pin tool (TS) facilitated a constant force, hexagonal pin (TS)H and pentagonal pin (TS)P tools facilitateda decreasing force behavior, and triangular pin designed tool (TS)T facilitated an increasing behavior of force in the weldingphase. The material flow experiments showed that the scroll shoulder with triangular pin shaped tool (TS)T completely shearedthe marker inserts in both parallel and perpendicular to weld conditions compared to other pin shapes. The sheared copperfragments were uniformly distributed on both advancing and retreating sides of the weld for (TS)T tool. Superior mechanicalproperties were noticed for (TS)T tool with a tensile strength of 184 MPa and Microhardness of 78 HV at stir zone.
Kishore, G.Krishna,Pande, S.,Manjula, K.,Rao, J.Narayana,Thomas, D. The Korean Society of Plant Pathology 2002 Plant Pathology Journal Vol.18 No.4
Andhra Pradesh is one of the major groundnut growing states in India. A total of 182 groundnut samples collected at harvesting from farmers fields in five districts, namely; Anantapur, Chittoor, Cuddapah, Kurnool, and Mahaboobnagar, during 1999 and 2000 rainy seasons were evaluated for the presence of mycotoxins (both aflatoxins and zearalenone) and toxigenic fungi. In samples collected from each district, average seed infection by Aspergillus flavus and Fusarium spp. was 11.9-18.3% and 5.6-12.8% in 1999, and 9.5-14.1% and 9.4-11.9% in 2000, respectively. Among the samples collected, 20.3% and 16.5% were contaminated with aflatoxin in 1999 and 2000, respectively, and in 11.4% and 8.7% of the seed samples collected in two seasons, the aflatoxin content was >30 $\mu\textrm{g}$/kg. An alarming aflatoxin content of 851.9$\mu\textrm{g}$/kg was found in samples collected from Anantapur district during the rainy season in 1999. Zearalenone was not detected in any of the samples collected in 1999, while 2 out of 103 samples collected in 2000 were contaminated with 35.1 and 129.4$\mu\textrm{g}$/kg. Under in vitro cultural conditions, 35.8% of the 173 A. flavus isolates collected from the groundnut samples produced aflatoxins at concentrations of 94.3-1598.6 ng/$\textrm{m}{\ell}$ and 3% of the 266 Fusarium spp. isolates produced 98.1-847.3 $\mu\textrm{g}$/g of zearalenone. The results emphasize the need for a more systematic and regular monitoring of pre-harvest aflatoxin contamination.
Control of Late Leaf Spot of Groundnut (Arachis hypogaea) by Extracts from Non-Host Plant Species
Kishore, G.Krishna,Pande, S.,Rao, J.Narayana The Korean Society of Plant Pathology 2001 Plant Pathology Journal Vol.17 No.5
The effects of leaf extracts of 14 different non-host plant species on in vitro conidial germination of Phaeoisariopsis personata, the causal organism of late leaf spot(LLS) of groundnut were evaluated. Aqueous and ethanol leaf extracts of Datura metel, Lawsonia inermis and aqueous leaf extracts of Sphaeranthus indicus at 25%(w/v) concentration completely inhibited the conidial germination of P. personata both at 24h and 48h after incubation. Aqueous leaf extracts of Blumea bifoliata, Eucalyptus globules, Ocimum sanctum and Pongamia pinnata, and ethanol leaf extracts of Azadirachta indica and S. indicus inhibited the conidial germination by >90%. Aqueous and ethanol leaf extract of L. inermis and S. indicus were highly inhibitory to conidial germination up to 1% concentration. Aqueous and ethanol leaf extracts of D. metel and ethanol leaf extract of A. indica were highly inhibitory to P. personata even at 0.01% (100 ppm) concentration. Ethanol leaf extract of A. indica up to $80^{\circ}$, aqueous leaf extracts of D. metel and S. indicus up to $100^{\circ}$, and L. inermis up to $60^{\circ}$, were highly stable and retained their fungitoxic effects. Extract of D. metel was antifungal even after 180 days when it was stored both at room temperature and $4^{\circ}$. Aqueous leaf extract of D. metel at 2% concentration effectively reduced the development of LLS by >60%, under greenhouse conditions both in prophylactic and simultaneous applications. Extracts of D. metel could be a potential economical and an eco-frendly alternative for control of late leaf spot, and its efficacy under field conditions is further being evaluated.
Post-Buckling & Collapse Behavior of a Circular Cylinder
R.Krishna Kishore,Joo-Shin Park,Bong- Jae Kim,Ki-Bok Jang,Yong-Suk Suh 대한조선학회 2012 대한조선학회 학술대회자료집 Vol.2012 No.5
The objective of this paper is to examine and clarify the fundamental post-buckling behavior including elasto-plastic collapse of circular cylinder subjected to axial loading. A series of elastic and elasto-plastic large deflection analyses as well as elastic eigen buckling analysis are performed. On the basis of the numerical results, the effects of curvature (R/t), magnitude of initial imperfection on the characteristics of the post buckling and collapse behavior of circular cylinder under design loads are discussed. The obtained critical buckling stress will be compared with the theoretical formulations of Timoshenko.
Genetic Optimization based Adaptive Fuzzy Logic Control of a pH Neutralization Process
Parikshit Kishor Singh,Surekha Bhanot,Hare Krishna Mohanta 보안공학연구지원센터 2014 International Journal of Control and Automation Vol.7 No.11
Presence of severe nonlinearity in pH neutralization process makes the problem of pH control a difficult and challenging one. Further, optimized control of such highly nonlinear system requires tuning of various parameters with a suitable evolutionary algorithm (EA). This paper presents genetic algorithm (GA) based unconstrained, continuous and single-objective optimization of conventional and adaptive nonlinear fuzzy logic control (FLC) of pH neutralization process for servo and regulatory operations. The GA optimized adaptive FLC scheme changes the universe of discourse of input-output membership functions based on the region of operation and amount of step change in set-point and load. The performance of controllers are evaluated using integral of squared errors (ISE) and tested for random step changes in set-point and load.
A Rare Case of Male Primary Breast Lymphoma
Jawahar Rathod,Kishor Taori,Amit Disawal,Prajwaleet Gour,Suresh Dhakate,Rachna Mone,Krishna Prasad Bellam 한국유방암학회 2011 Journal of breast cancer Vol.14 No.4
Primary lymphoma of the breast is a rare occurrence because of the paucity of lymphoid tissue in the breast and is an even rarer entity in the male breast. Imaging, along with tissue diagnosis goes a long way in diagnosing breast lymphoma which has a significantly different management scheme than other breast neoplasms with respect to radio-chemotherapy rather than surgical resection. We present a case of primary male breast lymphoma which was evaluated with magnetic resonance imaging as well as other conventional imaging modalities and was treated by chemotherapy with a 7-month follow-up.
Manjula, K.,Kishore, G.Krishna,Girish, A.G.,Singh, S.D. The Korean Society of Plant Pathology 2004 Plant Pathology Journal Vol.20 No.1
In an attempt to develop effective biocontrol system for management of stem rot disease in groundnut, 57 bacterial isolates and 13 isolates of Trichoderma spp. were evaluated for their antagonistic activity against Sclerotium rolfsii. The antagonists were selected based on their ability to inhibit the external growth of S. rolfsii from infected groundnut seeds. Four isolates of Pseudomonas fluorescens, GB 4, GB 8, GB 10 and GB 27, and T. viride pq 1 were identified as potent antagonists of S. rolfsii. T. viride pq 1 produced extracellular chitinase and parasitized the mycelium of S. rolfsii. Under controlled environment conditions, P. fluorescens GB 10, GB 27, T. viride pq 1 and the systemic fungicide Thiram(equation omitted) reduced the mortality of S. rolfsii inoculated to groundnut seedlings by 58.0%, 55.9%, 70.0% and 25.9%, respectively compared to control. In vitro growth of P. fluorescens GB 10 and GB 27 was compatible with T. viride pq 1 and Thiram(equation omitted). Integrated use of these two bacterial isolates with T. viride pq 1 or Thiram(equation omitted) improved their biocontrol efficacy. Combined application of either GB 10 or GB 27 with T. viride pq 1 was significantly effective than that with Thiram(equation omitted) in protecting groundnut seedlings from stem rot infection.