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Rajkumar,Fakrudin Bashasab,Mahaling S Kuruvinashetti 한국식물병리학회 2007 Plant Pathology Journal Vol.23 No.2
Genetic diversity among selected isolates of Macrophomina phaseolina, a causal agent of charcoal rot (stalk rot) disease in sorghum was studied using PCRRAPD markers. A set of ten isolates, from ten different rabi sorghum genotypes representing two traditional sorghum growing situations viz., Dharwad- a transitional high rainfall region and Bijapur- a semi-arid low rainfall region in South India. From a set of 40 random primers tested, amplicon profiles of 15 were reproducible. A total of 149 amplicon levels, with an average of 9.9 bands per primer, were available for analysis, of which 148 were polymorphic (99.3%). It was possible to discriminate all the isolates with any of the 15 primers employed. UPGMA clustering of data indicated that the isolates shared varied levels of genetic similarity within a range of 0.14 to 0.72 similarity coefficient index and it was suggestive that grouping of isolates was not related to sampling location in anyway. A high level of genetic heterogeneity of 0.28 was recorded among the isolates.
On harmonic convolutions involving a vertical strip mapping
Raj Kumar,Sushma Gupta,Sukhjit Singh,Michael Dorff 대한수학회 2015 대한수학회보 Vol.52 No.1
Let $ f_\beta=h_\beta+\overline{g}{_\beta}$ and $F_a=H_a+\overline{G}_a$ be harmonic mappings obtained by shearing of analytic mappings $$h_\beta+g_\beta={1}/{(2i{\sin}\beta)}\log\left({(1+ze^{i\beta})}/{(1+ze^{-i\beta})}\right),~0<\beta<\pi$$ and $H_a+G_a={z}/{(1-z)}$, respectively. Kumar \emph{et al.} \cite{ku and gu} conjectured that if $\omega(z)=e^{i\theta}z^n (\theta\in\mathbb{R},\,\, n\in \mathbb{N})$ and $ \omega_a(z)={(a-z)}/{(1-az)},\,a\in(-1,1)$ are dilatations of $f_\beta$ and $F_a$, respectively, then $F_a\widetilde\ast f_\beta \, \in S_H^0$ and is convex in the direction of the real axis, provided $a\in \left[{(n-2)}/{(n+2)},1\right)$. They claimed to have verified the result for $n=1,2,3$ and $4$ only. In the present paper, we settle the above conjecture, in the affirmative, for $\beta=\pi/2$ and for all $n\in \mathbb{N}$.
Raj Kumar,Sonal Gupta,Sourabh Wajhal,S.K. Satpati,M.L. Sahu 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.5
Liquid fueled molten salt reactors (MSRs) have seen renewed interest because of their inherent safetyfeatures, higher thermal efficiency and potential for efficient thorium utilisation for power generation. Thorium fluoride is one of the salts used in liquid fueled MSRs employing TheU cycle. In the presentstudy, ThF4 was prepared by hydro-fluorination of ThO2 using anhydrous HF gas. Process parameters viz. bed depth, hydrofluorination time and hydrofluorination temperature, were optimized for the preparation of ThF4 in a static bed reactor setup. The products were characterized with X-Ray diffraction andexperimental conditions for complete conversion to ThF4 were established which also corroborated withthe yield values. Hydrofluorination of ThO2 at 450 C for half an hour at a bed depth of 6 mm gave thebest result, with a yield of about 99.36% ThF4. No unconverted oxide or any other impurity was observed. Rietveld refinement was performed on the XRD data of this ThF4, and Chi2 value of 3.54 indicated goodagreement between observed and calculated profiles.
Analytical Modelling and Simulation Analysis of Junctionless Nanotube (JL NT) MOSFET
Raj Kumar,Raj Kumar,Arvind Kumar 한국전기전자재료학회 2022 Transactions on Electrical and Electronic Material Vol.23 No.4
In this paper, an analytical model for junctionless nanotube (JLNT) MOSFET has been developed. The analytical model for minimum central potential, threshold voltage and drain current has been developed by using variable separation method. These model expressions are further applied to analyse the Short Channel Effects (SCEs) of JL NT MOSFET. The electrical performance of proposed device has been investigated by varying different process parameters such as silicon nanotube thickness, gate oxide thickness, and gate length. All the results of developed models have been validated by comparing with so obtained simulated results from genius 3D device simulator of VisualTCAD for different device parameters. JLNT MOSFET with appropriate design parameters can be further explored for circuit applications.
RAJ KUMAR,ANIL KUMAR 대한설비공학회 2013 International Journal Of Air-Conditioning and Refr Vol.21 No.4
An NH3–H2O ejector-absorption refrigeration cycle, and an R-152a ejector refrigeration cycle are employed with a renewable energy power generator to make a proposed compact power generation and triple effect ejector-absorption refrigeration cycle. The exergy analysis of the cycle leads to a possible performance improvement. Approximately 71.69% of the input exergy is destructed due to irreversibilities in different components. Around 7.976% is available as the useful exergy output. The exhaust exergy lost to the environment is 20.33%, which is lower than the exhaust energy loss of 47.95%, while the useful energy output is 27.88%. The refrigerants used are of zero ODP and negligible GWP, and the CO2 emission of the exhaust gases is very small as compared to that of the fossil fuel run engine, hence, this cycle is favorable to the global environment. The results also show that the proposed cycle has signi¯cant higher energy and exergy effciency than the earlier investigated `triple effect refrigeration cycle' and `the combined power and ejectorrefrigeration cycle'.
Bactericidal Efficacy of Electrospun Rosin/Poly(ε-caprolactone) Nanofibers
Rajkumar Nirmala,김학용,백우일,Rangaswamy Navamathavan,김태우,Duraisamy Kalpana,박미라,박수진 한국고분자학회 2014 Macromolecular Research Vol.22 No.2
Poly(ε-caprolactone) (PCL)-containing rosin nanofibers were prepared via electrospinning technique forbiomedical applications. To improve the biocompatibility properties, rosin was blended into PCL to prepare nanofibers. Nanofibers mats were prepared with different concentrations of rosin. The morphology, structure, and thermalproperties of the resultant PCL/rosin nanofibers were analyzed using scanning electron microscopy (SEM), X-raydiffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, differential scanning calorimetry (DSC), andthermogravimetry (TGA) analysis. SEM images revealed that the nanofibers were well-oriented and had good incorporationof rosin. FTIR results indicated the various bonding groups of PCL/rosin nanofibers with stable structure. TGA analysis revealed that the onset degradation temperature was decreased with increasing rosin content in thenanofibers. The bactericidal activity of PCL/rosin nanofibers was also investigated. These results indicate that thePCL blended with rosin nanofibers can be utilized as a promising candidate material for many biomedical applications.
Quality and Acceptability of Meat Nuggets with Fresh Aloe vera Gel
Rajkumar, V.,Verma, Arun K.,Patra, G.,Pradhan, S.,Biswas, S.,Chauhan, P.,Das, Arun K. Asian Australasian Association of Animal Productio 2016 Animal Bioscience Vol.29 No.5
Aloe vera has been used worldwide for pharmaceutical, food, and cosmetic industries due to its wide biological activities. However, quality improvement of low fat meat products and their acceptability with added Aloe vera gel (AVG) is scanty. The aim of this study was to explore the feasibility of using fresh AVG on physicochemical, textural, sensory and nutritive qualities of goat meat nuggets. The products were prepared with 0%, 2.5%, and 5% fresh AVG replacing goat meat and were analyzed for proximate composition, physicochemical and textural properties, fatty acid profile and sensory parameters. Changes in lipid oxidation and microbial growth of nuggets were also evaluated over 9 days of refrigerated storage. The results showed that AVG significantly (p<0.05) decreased the pH value and protein content of meat emulsion and nuggets. Product yield was affected at 5% level of gel. Addition of AVG in the formulation significantly affected the values of texture profile analysis. The AVG reduced the lipid oxidation and microbial growth in nuggets during storage. Sensory panelists preferred nuggets with 2.5% AVG over nuggets with 5% AVG. Therefore, AVG up to 2.5% level could be used for quality improvement in goat meat nuggets without affecting its sensorial, textural and nutritive values.
( Rajkumar Bandi ),( Chan-woo Park ),( Song-yi Han ),( Azelia Wulan Cindradewi ),( Eun-ah Lee ),( Jeong-ki Kim ),( Gu-joong Kwon ),( Seung-hwan Lee ) 한국목재공학회 2021 한국목재공학회 학술발표논문집 Vol.2021 No.1
Preparation of nanocellulose-based hydrogels that can be used in the field of biomedicine, have gained tremendous attention. Carbon dots are the latest addition to the carbon nanomaterials family and are well known for their stable fluorescence and high biocompatibility. Hence the incorporation of carbon dots into the nanocellulose-based hydrogels can broaden their applicability. In this work, a facile one-pot hydrothermal method is demonstrated to prepare N-doped carbon dots/holocellulose nanofibrils composite (NCDs/HCNF) hydrogel. During the hydrothermal treatment, the NCDs grow in-situ on HCNF surface and serve as cross-linkers to produce hydrogel. Hemicellulose portion of HCNF act as carbon source and ethylenediamine will serve as N dopant. Synthesis conditions were optimized, optical and physicochemical properties were studied in detail.
Rajkumar, M.,Mahadevan, K.,Kannan, S.,Baskar, S. The Korean Institute of Electrical Engineers 2014 Journal of Electrical Engineering & Technology Vol.9 No.2
Non-dominated Sorting Genetic Algorithm-II (NSGA-II) is applied for solving Combined Economic Emission Dispatch (CEED) problem with valve-point loading of thermal generators. This CEED problem with valve-point loading is a nonlinear, constrained multi-objective optimization problem, with power balance and generator capacity constraints. The valve-point loading introduce ripples in the input-output characteristics of generating units and make the CEED problem as a nonsmooth optimization problem. To validate its effectiveness of NSGA-II, two benchmark test systems, IEEE 30-bus and IEEE 118-bus systems are considered. To compare the Pareto-front obtained using NSGA-II, reference Pareto-front is generated using multiple runs of Real Coded Genetic Algorithm (RCGA) with weighted sum of objectives. Comparison with other optimization techniques showed the superiority of the NSGA-II approach and confirmed its potential for solving the CEED problem. Numerical results show that NSGA-II algorithm can provide Pareto-front in a single run with good diversity and convergence. An approach based on Technique for Ordering Preferences by Similarity to Ideal Solution (TOPSIS) is applied on non-dominated solutions obtained to determine Best Compromise Solution (BCS).
One-Pot Synthesis of Ag Nanoparticles/Carbon Dots/Holocellulose Nanofibrils Ternary Nanocomposite
( Rajkumar Bandi ),( Chan-woo Park ),( Song-yi Han ),( Azelia Wulan Cindradewi ),( Eun-ah Lee ),( Jeong-ki Kim ),( Gu-joong Kwon ),( Seung-hwan Lee ) 한국목재공학회 2021 한국목재공학회 학술발표논문집 Vol.2021 No.1
Research on development of sustainable and environmentally friendly nanocomposites is a fast growing field due to their potential applications from the combination of unique chemical, optical and mechanical characteristics. Nanocellulose has a great potential to act as a sustainable support material for the formation of various nanocomposites. In this work, a novel ternary composite consisting of Ag nanoparticles, carbon dots and holocellulose nanofibrils (AgNPs/CDs/HCNF) is prepared by a one-pot hydrothermal treatment. During the reaction, AgNPs and CDs were grown in-situ on HCNF. Hemicellulose is crucial for the formation of CDs and AgNPs which was evident from control experiments using pure cellulose nanofibrils. Synthesis conditions were optimized, optical and physicochemical properties of the composite were studied in detail.