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Manivannan, A.,Soundararajan, P.,Cho, Y. S.,Park, J. E.,Jeong, B. R. Informa UK (TaylorFrancis) 2018 Plant biosystems Vol.152 No.4
<P>The present endeavor has demonstrated the impacts of different sources of silicon (Si) such as potassium silicate (K2SiO3) and calcium silicate (CaSiO3) during the in vitro axillary shoot multiplication of carnation. For the Si treatments, nodal explants were cultured onto the Murashige and Skoog's medium fortified with 1.0mgL(-1) of 6-benzyladenine and 0.5mgL(-1) indole-3-acetic acid with or without K2SiO3 and CaSiO3 in three different concentrations (0, 1.8, or 3.6mM). After six weeks, the shoot induction ratio, number of shoots produced per explant, expression of photosystem (PS) I and II core proteins, and activities of antioxidant enzymes were examined. Among the Si sources, K2SiO3 application enhanced the axillary shoot multiplication and the uptake of Si on comparison with CaSiO3. Both forms of Si resulted in the enhancement of stomatal density, and PS-related protein such as PsaA and PsbA illustrating the apparent involvement of Si on the photosynthetic process. Nevertheless, addition of Si improved the antioxidant capacity during the in vitro shoot multiplication. Overall, the outcomes of the present study suggested that Si can be utilized as a supplementary source during the in vitro propagation of carnation.</P>
아루무감(Arumugam S),홍성훈(S. H. Hong),뚜안(D. T. Nguyen),마니반난(Manivannan R),김영석(Y. S. Kim) 한국소성가공학회 2010 한국소성가공학회 학술대회 논문집 Vol.2010 No.5
At presence the industrial practice demands a reliable determination of forming limits which assures the prediction of properly selecting the forming process in a digital environment. Therefore, technological limits defined with the forming limit diagrams (FLDs) have to be known. The experimental evaluation of FLDs for sheet metal is time consuming and demands expensive equipment. Hot press forming (HPF) is an advanced sheet metal forming methodology which can able to produce high strength final product by forming the part with high temperature and also cooling the part rapidly inside dies, it’s an one of the most successful forming process which can produce a component with complex geometric shape, high strength and minimum spring back. For conventional sheet metal forming processes the forming limit diagram (FLD) is primarily applied as failure criterion in the automotive industry regarding a FE-based process design. This works deals with the prediction of formability of sheet metal during the hot press forming. In order to predict the FLD at high temperature, we used Marciniak-Kuczynski flat punch for equi-biaxial and round punch for uniaxial and plane strain for In-plane deformation test. However, thermo-mechanical coupled simulation carried out by using DEFORM-3D for forming and predicting the failure by using Normalized Cockcroft-Latham failure criterion model. By applying the above failure criteria in DEFORM-3D FLD simulation, we need to determine the critical damage values (C?) calculated from out of plane deformation test for uniaxial and plane strain experiments carried out at 25℃ (RT), 500℃ and 700℃. In addition, the formability of the simulation results in a hot press formed part is compared with the experimental ones to confirm the validity of the proposed simulations.
Transportation Problem for Interval Valued Trapezoidal Intuitionistic Fuzzy Numbers
Manivannan Annamalai,J. Jansi Rani,S. Dhanasekar 한국지능시스템학회 2022 INTERNATIONAL JOURNAL of FUZZY LOGIC and INTELLIGE Vol.22 No.2
The aim of the decision-makers in the transportation industry is to maximize profit by minimizing the transportation cost. The transportation structure is the center of economic activity inthe business logistics system. However, transportation costs may vary owing to various unpredictable factors. In this study, cost of the transporting unit is considered as an interval valuedtrapezoidal intuitionistic fuzzy number to deal with these uncertainties. The transportationproblem with interval-valued trapezoidal intuitionistic fuzzy cost is discussed here, and thecosts are ordered by score and score expected functions. As a special case, the interval-valuedtrapezoidal intuitionistic cost is not converted into crisp numbers to solve the transportationproblem and derive the initial basic feasible (IBF) solution through interval-valued intuitionistic costs. Furthermore, the optimality of the derived initial basic feasible solution is checkedusing the modified distribution (MODI) method. The effectiveness and validation of thedeveloped approach were illustrated using numerical examples.
Manivannan, R.,Panda, S.,Chong, Kil To,Cao, Jinde Elsevier 2018 Neural networks Vol.106 No.-
<P><B>Abstract</B></P> <P>The issue of unified dissipativity-based Arcak-type state estimator design for delayed static neural networks (SNNs) with leakage term and noise distraction was considered here. An Arcak-type state observer, which is compact than the usually used Luenberger-type state estimator, is selected to implement the subject of a unified dissipativity performance of SNNs. This paper primarily concentrates on the issue of Arcak-type state estimator of delayed SNNs involving leakage delay. The first attempt is made to tackle the Arcak-type state estimator of SNNs with time delay in leakage term in this paper based on the unified criteria, by constructing a novel Lyapunov functional together with newly improved integral inequalities. As a result, a novel unified state estimation criterion is launched in the form of linear matrix inequalities (LMIs) and put forward to justify the dynamics of error system is extended dissipative with the influence of leakage term and estimator gain matrices <SUB> K ¯ 1 </SUB> and <SUB> K ¯ 2 </SUB> . Finally, an interesting simulation study is ultimately explored to show the performance of the established unified dissipativity-based theoretical results, in which, comparison results are also made together with recent works as a special case.</P>
Purification and Preparation of Single-Walled Carbon Nanotube Films
박규창,S. Manivannan,정일옥,류재황,이창석,장진,김기서 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.5
We describe a simple process for the removal of metal catalysts and the dispersion of single-walled carbon nanotubes (SWNTs) in aqueous and organic solvents without damaging the structure of the nanotubes. The metal catalyst was removed by using a sodium hydroxide (NaOH) - ethyl alcohol (EtOH) solution. Dispersion of purified nanotubes was accomplished by using a polymer wrapping functionalization. Raman and scanning electron microscope analyses were performed to confirm the purity and the dispersion of the treated tubes. The bundle size of the dispersed SWNTs was elucidated using the atomic force microscopy technique and the size was measured as 2 - 5 nm. Transparent and conducting carbon nanotube films were prepared on glass substrates by using a spin-coating method. Optical transmission and sheet resistance measurements showed that the randomly-oriented, dispersed nanotubes film had an average sheet resistance of 974 Ω/□ and a at optical transmission of ∽77 % at 600 nm. In this simple and scalable process, the sheet resistance and the optical transmission of the film were controlled by using the number of coatings and the concentration of the solution. We describe a simple process for the removal of metal catalysts and the dispersion of single-walled carbon nanotubes (SWNTs) in aqueous and organic solvents without damaging the structure of the nanotubes. The metal catalyst was removed by using a sodium hydroxide (NaOH) - ethyl alcohol (EtOH) solution. Dispersion of purified nanotubes was accomplished by using a polymer wrapping functionalization. Raman and scanning electron microscope analyses were performed to confirm the purity and the dispersion of the treated tubes. The bundle size of the dispersed SWNTs was elucidated using the atomic force microscopy technique and the size was measured as 2 - 5 nm. Transparent and conducting carbon nanotube films were prepared on glass substrates by using a spin-coating method. Optical transmission and sheet resistance measurements showed that the randomly-oriented, dispersed nanotubes film had an average sheet resistance of 974 Ω/□ and a at optical transmission of ∽77 % at 600 nm. In this simple and scalable process, the sheet resistance and the optical transmission of the film were controlled by using the number of coatings and the concentration of the solution.
Hall anomaly in CNT-doped Y-123 high temperature superconductor
Dadras, S.,Manivannan, N.,Kim, K.H.,Daadmehr, V.,Akhavan, M. North-Holland 2010 Physica. C, Superconductivity Vol.470 No.5
In order to study the Hall effect in pure and CNT-doped Y-123 polycrystalline samples, we have measured the longitudinal and transverse voltages at different magnetic field (0-9T) in the normal and vortex states. In the normal state, the Hall coefficient is positive and decreases with increasing temperature, and can be approximately fitted to R<SUB>H</SUB>=a+bT<SUP>-1</SUP>. We have found a sign reversal in the pure sample for the magnetic field of about 3T, and double sign reversal of the Hall coefficient in the 0.7wt% CNT-doped sample at about 3 and 5T. The Hall resistivity in our samples depends on the pinning.
Lakshmanamoorthy K.,Manivannan S. 한국탄소학회 2024 Carbon Letters Vol.34 No.1
Achieving cost-effective and defect-free graphene sheets is highly desirable for sensor devices. Aiming this, few-layer graphene (~ 3) sheets are prepared by an electrochemical exfoliation with [NMP] [HSO4] electrolyte (i.e., Bronsted acidic ionic liquid). A novel approach for the effective exfoliation of graphene sheets is demonstrated by (i) simultaneously applying a constant potential through an electrochemical cell (with different electrolyte concentrations) and (ii) together with sonication. The exfoliated graphene sheets are characterized through state-of-the-art techniques and sprayed on a glass substrate at optimum conditions. Thus, the transparent conducting sensor device is fabricated with a suitable contact electrode and used for ammonia vapor sensing and the sensor performances are highly dependent on the concentration of the ionic liquid used during the electrochemical exfoliation. The sensing response and limit of detection for the exfoliated graphene-based film were calculated as 3.56% and 432 ppb, respectively. Further studies indicated that the fabricated sensors are more selective towards ammonia molecules with quick response and recovery times.