Genetic Variability and Association of Yield Attributing Characters with Grain Yield in Deepwater Rice

L. K. Bose,S. K. Pradhan,A. Mohanty,M. Nagaraju 韓國作物學會 2005 Korean journal of crop science Vol.50 No.4

A study on genetic variability and association of yield attributing characters with grain yield was carried out using 35 deepwater rice genotypes. High genotypic co-efficient of variation (GCV) was observed for plot yield, EBT/m2 , plant height and days to 50~% flowering (DFF). For all the traits, estimates of the phenotypic co-efficient of variation (PCV) were higher than GCV, indicating presence of environmental influence. High heritability and genetic advance was observed for plot yield, EBT/m2 and plant height. Plot yield had significant positive association with test weight, EBT/m2 and DFF. However, test weight had the maximum direct effect on grain yield

Genetic Variability and Association of Yield Attributing Characters with Grain Yield in Deepwater Rice

Bose L. K.,Pradhan S. K.,Mohanty A.,Nagaraju M. The Korean Society of Crop Science 2005 Korean journal of crop science Vol.50 No.4

A study on genetic variability and association of yield attributing characters with grain yield was carried out using 35 deepwater rice genotypes. High genotypic co-efficient of variation (GCV) was observed for plot yield, $EBT/m^2$, plant height and days to $50\%$ flowering (DFF). For all the traits, estimates of the phenotypic co-efficient of variation (PCV) were higher than GCV, indicating presence of environmental influence. High heritability and genetic advance was observed for plot yield, $EBT/m^2$ and plant height. Plot yield had significant positive association with test weight, $EBT/m^2$ and DFF. However, test weight had the maximum direct effect on grain yield

Strain energy release rates in the curved spar wingskin joints with pre-embedded delaminations

P.K. Mishra,A.K. Pradhan,M.K. Pandit,S.K. Panda 국제구조공학회 2023 Structural Engineering and Mechanics, An Int'l Jou Vol.87 No.1

Any pre-existed delamination defect present during manufacturing or induce during service loading conditions in the wingskin adherend invariably shows a greater loss of structural integrity of the spar wingskin joint (SWJ). In the present study, inter-laminar delamination propagation at the critical location of the SWJ has been carried out using contact and multi-point constraint finite elements available with commercial FE software (ANSYS APDL). Strain energy release rates (SERR) based on virtual crack closure technique have been computed for evaluation of the opening (Mode-I), sliding (Mode-II) and cross sliding (Mode-III) modes of delamination by sequential release of multi point constraint elements. The variations of different modes of SERR are observed to be significant by considering varied delamination lengths, material properties of adherends and radius of curvature of the SWJ panel. The SERR rates are seen to be much different at the two pre-embedded delamination ends. This shows dissimilar delamination propagation rates. The maximum is seen to occur in the delamination front in the unstiffened region of the wingskin. The curvature geometry and material anisotropy of SWJ adherends significantly influences the SERR values. Increase in the SERR values are observed with decrease in the radius of curvature of wingskin panel, keeping its width unchanged. SWJs made with flat FRP composite adherends have superior resistance to delamination damage propagation than curved composite laminated SWJ panels. SWJ made with Boron/Epoxy (B/E) material shows greater resistance to the delamination propagation.

Thermoelastic effect on inter-laminar embedded delamination characteristics in Spar Wingskin Joints made with laminated FRP composites

P.K. Mishra,A.K. Pradhan,M.K. Pandit,S.K. Panda 국제구조공학회 2020 Steel and Composite Structures, An International J Vol.35 No.3

This paper presents two sets of full three-dimensional thermoelastic finite element analyses of superimposed thermo-mechanically loaded Spar Wingskin Joints made with laminated Graphite Fiber Reinforced Plastic composites. The study emphasizes the influence of residual thermal stresses and material anisotropy on the inter-laminar delamination behavior of the joint structure. The delamination has been pre-embedded at the most likely location, i.e., in resin layer between the top and next ply of the fiber reinforced plastic laminated wingskin and near the spar overlap end. Multi-Point Constraint finite elements have been made use of at the vicinity of the delamination fronts. This helps in simulating the growth of the embedded delamination at both ends. The inter-laminar thermoelastic peel and shear stresses responsible for causing delamination damage due to a combined thermal and a static loading have been evaluated. Strain energy release rate components corresponding to the Mode I (opening), Mode II (sliding) and Mode III (tearing) of delamination are determined using the principle of Virtual Crack Closure Technique. These are seen to be different and non-self-similar at the two fronts of the embedded delamination. Residual stresses developed due to the thermoelastic anisotropy of the laminae are found to strongly influence the delamination onset and propagation characteristics, which have been reflected by the asymmetries in the nature of energy release rate plots and their significant variation along the delamination front.

Generation of Internal Tides: An Interaction of Tides with Variable Topography and Coastal Geometry

Himansu K. Pradhan,A. D. Rao,Sachiko Mohanty 한국해양과학기술원 2015 Ocean science journal Vol.50 No.2

The paper describes tide-topography interaction with changeable width and angle of continental shelf. Experiments are designed with MITgcm over a study area representative of the western Bay of Bengal with an idealized bathymetry. As the actual coastline consists of an irregular configuration, the experiments are set with different coastline geometry. The tidal forcing is incorporated in the model to generate internal tides by adding tidal components in the momentum equations. The density stratification represents the region during May and is kept invariant for all the experiments. Spectral analysis suggests that semi-diurnal internal tides possess the maximum spectral estimate. The peak semi-diurnal estimate is computed to understand its variation over the shelfslope region. The analysis demonstrates that the estimate is smaller for wider shelves against narrow continental shelves. The peak estimate is observed close to 100m local depth over the shelf regardless of the angle and width. Experiments are further continued to distinguish the effect of rotation and geometry of the coast as the shelf width and shelf angle are kept constant. Comparison of spectral estimate is performed without and with rotation for three different coastline configurations: concave, convex and straight. The estimate is noticed maximum in the concave and minimum in the convex shape of the coast. Significant contribution of the rotational effect is seen as an increase in the semi-diurnal peak estimate towards the north of the domain. In order to confirm the effect of the rotation, a similar experiment is performed for the southern hemisphere revealing an enhancement of the estimate towards the south of the domain.

Farmland Prices in a Developing Economy - Some Stylised Facts and Determinants

Parmod Kumar,Basanta. K. Pradhan,A. Subramanian 서울대학교 국제학연구소 2005 Journal of International and Area Studies Vol.12 No.2

  The study constructs a district and state level series of farmland prices using the village level data from MIMAP-India survey and identifies the major determinants of farmland prices. The estimates at micro level showed that density of population in the rural areas, food grain yield and distance from the nearest town were the major determinants of farmland prices. When macro variables were added at the All India level, it was found that density of rural population, road density and share of non-agriculture in GDP as well as in work force affected farmland prices positively while rural poverty affected them adversely. The results appear to have implications for urban planning, industrial location and various government programs for rural development and poverty alleviation.

Thermoluminescence of chip inductors and resistors in new generation mobile phones for retrospective accident dosimetry

Lee, J.I.,Kim, H.,Kim, J.L.,Pradhan, A.S.,Kim, M.C.,Chang, I.,Lee, S.K.,Kim, B.H.,Park, C.Y.,Chung, K.S. Pergamon Press 2017 Radiation measurements Vol.105 No.-

<P>Luminescence dosimetric properties of inductors and resistors in mobile phones have attracted wide attention for their use in retrospective accident dosimetry. Thermoluminescence (TL) signal following optically stimulated luminescence (OSL) readout, which has been recently shown to be useful for dose re estimation (Lee et al., 2016), when measured by a Risoe OSL reader without a Hoya U-340 optical filter, was found to be up to 85 times of that recorded with the Hoya filter (with transmission window 270-380 nm, necessary for recording the usual OSL signal) placed in front of the photomultiplier tube (PMT) in the reader. In view of this, a study of dosimetric TL properties, namely sample-to-sample variation, fading, zero-dose signal, minimum measurable dose, effect of room light, dose response and emission spectrum, was undertaken to explore the use of TL of inductors and resistors in new generation mobile phones for accident dosimetry. The hitherto unknown TL emission spectrum was found to exhibit an intense emission beyond 550 nm (peaking at 700 nm) when recorded in the range from 250 nm to 750 nm. Emission below 500 nm was smaller by orders of magnitude than that at 700 nm. As the TL and OSL signals have been attributed to alumina substrates of inductors and resistors, the TL emission spectrum was compared with that of dosimetry grade Al2O3:C. The emission spectra of inductors and resistors were found to differ significantly, not only from that of Al2O3:C, but also from each other. Although the differences in TL glow curves, optical emission spectra, fading, etc. Indicated a lack of universality in luminescence properties of alumina substrates in different electronic components, it was concluded that the TL of inductors and resistors in new generation mobile phones offers a better option for accident dosimetry than OSL, with the specific advantage of much lower post-irradiation fading. (C) 2017 Elsevier Ltd. All rights reserved.</P>

3D finite element analysis of stress distributions and strain energy release rates for adhesive bonded flat composite lap shear joints having pre-existing delaminations

S. K. Parida,A. K. Pradhan 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.2

The rate of propagation of embedded delamination in the strap adherend of lap shear joint (LSJ) made of carbon/epoxy composites hasbeen evaluated employing three-dimensional non-linear finite elements. The delamination has been presumed to pre-exist in the thin resinlayer between the first and second plies of the strap adherend. The inter-laminar peel and shear stress distributions have been studied indetails and are seen to be predominantly three-dimensional in nature. The components of strain energy release rate (SERR) correspondingto the opening, sliding and cross sliding modes of delamination are significantly different at the two fronts of the embedded delamination. The sequential release of multi-point constraint (MPC) finite elements in the vicinity of the delamination fronts enables to simulatethe growth of the delamination at either ends. This simulation procedure can be utilized effectively for evaluation of the status of thestructural integrity of the bonded joints.

Improvement of power generation of microbial fuel cell by integrating tungsten oxide electrocatalyst with pure or mixed culture biocatalysts

Varanasi, J.L.,Nayak, A.K.,Sohn, Y.,Pradhan, D.,Das, D. Pergamon Press 2016 ELECTROCHIMICA ACTA Vol.199 No.-

The anode of microbial fuel cell was impregnated with tungsten oxide (WO<SUB>3</SUB>) and platinum-tungsten oxide (Pt/WO<SUB>3</SUB>) nanocomposites to improve its power generation. The amended anodes were tested against pure and mixed culture type of biocatalysts. Improved performance was exhibited by the modified electrodes as compared to the uncatalyzed electrodes using both biocatalysts. However, pure culture showed higher power outputs as compared to the enriched mixed consortia. The maximum power density up to 0.15mWcm<SUP>-2</SUP> (1.46Wm<SUP>-2</SUP>) was obtained using pure culture which was almost 45% higher as compared to uncatalyzed electrodes. The anode modification also helped in lowering the charge transfer resistance and improving the coulombic efficiencies of the MFCs. High capacitance with nanostructure catalysts implied their role in holding an electric charge while SEM and epifluorescent images revealed enhanced bacterial adhesion. The high electrode conductivity, stability, and biocompatibility of the modified anodes make them more attractive for practical microbial fuel cell applications.

Review on bioleaching of uranium from low-grade ore

김동진,안종관,윤호성,Patra, A.K.,Pradhan, D.,Kim, D.J.,Ahn, J.G,Yoon, H.S. 한국자원리싸이클링학회 2011 資源 리싸이클링 Vol.20 No.2

본 총설은 광석으로부터 우라늄의 미생물 침출시 사용하는 Acidithiobacillus forrooxidans, Acidithiobacillus thiooxidans 그리고 Leptospirillum ferrooxidans 등에 역할과 침출반응에 관하여 기술하였다. 미생물에 의한 우라늄의 침출반응은 박테리아가 우라늄 광석과 직접 반응하기 보다는 박테리아가 $U^{4+}$를 산화시키는데 필요한 $Fe^{3+}$를 공급하고, $Fe^{3+}$가 우라늄 광석과 반응하는 간접반응기구(indirect mechanism)에 의하여 일어난다. 건식제련법과 같은 전통적인 금속회수 공정에 비하여 환경친화적이고 경제적인 장점 때문에 저품위 광물자원으로부터 유기금속을 회수하는데 미생물 제련법이 널리 활용되고 있다. 현재 우라늄은 heap, dump 그리고 in situ를 이용한 미생물 침출법으로 회수되고 있다. Bioheap의 공기 투입량, 교반반응용기의 디자인 및 조업 개선 분야에서 기술개발이 지속적으로 이루어졌으며 최근에는 미생물 침출반응에 투입된 박테리아의 특성 개선 및 균주수를 제어하기 위한 molecular biology 분야에서 활발한 연구가 진행되고 있다. This review describes the involvement of different microorganisms for the recovery of uranium from the ore. Mainly Acidithiobacillus forrooxidans, Acidithiobacillus thiooxidans and Leptospirillum ferrooxidans are found to be the most widely used bacteria in the bioleaching process of uranium. The bioleaching of uranium generally follows indirect mechanism in which bacteria provide the ferric iron required to oxidize $U^{4+}$. Commercial applications of bioleaching have been incorporated for extracting valuable metals, due to its favorable process economics and reduced environmental problems compared to conventional metal recovery processes such as smelting. At present the uranium is recovered through main bioleaching techniques employed by heap, dump and in situ leaching. Process development has included recognition of the importance of aeration of bioheaps, and improvements in stirred tank reactor design and operation. Concurrently, knowledge of the key microorganisms involved in these processes has advanced, aided by advances in molecular biology to characterize microbial populations.