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- 저자 : Sadhu, (검색결과 34 건)
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Sadhu Kolekar,Shashikant P. Patole,Ji‑Beom Yoo,Chandrakant V. Dharmadhikari 대한금속·재료학회 2018 ELECTRONIC MATERIALS LETTERS Vol.14 No.2
Field emission from nanostructured films is known to be dominated by only small number of localized spots which varieswith the voltage, electric field and heat treatment. It is important to develop processing methods which will produce stableand uniform emitting sites. In this paper we report a novel approach which involves analysis of Proximity Field EmissionMicroscopic (PFEM) images using Scanning Probe Image Processing technique. Vertically aligned carbon nanotube emittershave been deposited on tungsten foil by water assisted chemical vapor deposition. Prior to the field electron emission studies,these films were characterized by scanning electron microscopy, transmission electron microscopy, and Atomic ForceMicroscopy (AFM). AFM images of the samples show bristle like structure, the size of bristle varying from 80 to 300 nm. The topography images were found to exhibit strong correlation with current images. Current–Voltage (I–V) measurementsboth from Scanning Tunneling Microscopy and Conducting-AFM mode suggest that electron transport mechanism in imagingvertically grown CNTs is ballistic rather than usual tunneling or field emission with a junction resistance of ~10 kΩ. It wasfound that I–V curves for field emission mode in PFEM geometry vary initially with number of I–V cycles until reproducibleI–V curves are obtained. Even for reasonably stable I–V behavior the number of spots was found to increase with the voltageleading to a modified Fowler–Nordheim (F–N) behavior. A plot of ln(I/V3) versus 1/V was found to be linear. Currentversus time data exhibit large fluctuation with the power spectral density obeying 1/f2 law. It is suggested that an analogueof F–N equation of the form ln(I/Vα) versus 1/V may be used for the analysis of field emission data, where α may depend onnanostructure configuration and can be determined from the dependence of emitting spots on the voltage.
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Photochemical dehydrogenation of 3,4-dihydro-2-pyridones
Sadhu, Partha Sarathi,Ravinder, Mettu,Kumar, Perepogu Arun,Rao, Vaidya Jayathirtha Korean Society of Photoscience 2009 Photochemical & photobiological sciences Vol.8 No.4
Photochemical dehydrogenation of various substituted 3,4-dihydro-2-pyridones was achieved in a very efficient way by employing 10-15 mol% of photo-induced electron transfer sensitizers like 9-cyanoanthracene, 9-cyanophenanthrene and 1-cyanonaphthalene in presence of molecular oxygen, for the first time.
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Total Synthesis of Azasugar 1,4-Dideoxy-1,4-imino-D-galacitol
Sadhu, Partha Sarathi,Santhoshi, Amlipur,Rao, Vaidya Jayathirtha Korean Chemical Society 2012 Bulletin of the Korean Chemical Society Vol.33 No.11
A new highly stereoselective synthesis of pyrrolidine azasugar 1,4-dideoxy-1,4-imino-D-galacitol is being reported herein. The synthesis was achieved in a linear sequence and inexpensive chiral source (+)-diethyl tartarate was used as the starting material. The key step involved during the synthesis was Pd catalysed amino cyclization of alkenylamine, Bose modified Mitsunobu reaction and Sharpless asymmetric dihydroxylation.
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Sadhu, Nithya Lavanya,Teegala, Bramhananda Reddy,Marapu, Vijay Kumar The Korean Institute of Power Electronics 2020 JOURNAL OF POWER ELECTRONICS Vol.20 No.6
High amounts of harmonics cause noise and electromagnetic interference to nearby systems. Pulsewidth modulation (PWM) techniques are used to reduce the amount of harmonics near the multiples of switching frequencies. To trim down the noise and electromagnetic interference and improve the quality of the output voltages, different types of constant and variable switching frequency random PWM techniques for dual inverter-fed open-end winding induction motor drive configuration are discussed in this study. Moreover, the vector control technique is used along with random PWM techniques to improve the transient response of the dual inverter.
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Sadhu, A.,Hazraa, B.,Narasimhan, S. Techno-Press 2014 Smart Structures and Systems, An International Jou Vol.13 No.2
In this paper, a novel PARAllel FACtor (PARAFAC) decomposition based Blind Source Separation (BSS) algorithm is proposed for modal identification of structures equipped with tuned mass dampers. Tuned mass dampers (TMDs) are extremely effective vibration absorbers in tall flexible structures, but prone to get de-tuned due to accidental changes in structural properties, alteration in operating conditions, and incorrect design forecasts. Presence of closely spaced modes in structures coupled with TMDs renders output-only modal identification difficult. Over the last decade, second-order BSS algorithms have shown significant promise in the area of ambient modal identification. These methods employ joint diagonalization of covariance matrices of measurements to estimate the mixing matrix (mode shape coefficients) and sources (modal responses). Recently, PARAFAC BSS model has evolved as a powerful multi-linear algebra tool for decomposing an $n^{th}$ order tensor into a number of rank-1 tensors. This method is utilized in the context of modal identification in the present study. Covariance matrices of measurements at several lags are used to form a $3^{rd}$ order tensor and then PARAFAC decomposition is employed to obtain the desired number of components, comprising of modal responses and the mixing matrix. The strong uniqueness properties of PARAFAC models enable direct source separation with fine spectral resolution even in cases where the number of sensor observations is less compared to the number of target modes, i.e., the underdetermined case. This capability is exploited to separate closely spaced modes of the TMDs using partial measurements, and subsequently to estimate modal parameters. The proposed method is validated using extensive numerical studies comprising of multi-degree-of-freedom simulation models equipped with TMDs, as well as with an experimental set-up.
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A. Sadhu,B. Hazra,S. Narasimhan 국제구조공학회 2014 Smart Structures and Systems, An International Jou Vol.13 No.2
In this paper, a novel PARAllel FACtor (PARAFAC) decomposition based Blind Source Separation (BSS) algorithm is proposed for modal identification of structures equipped with tuned mass dampers. Tuned mass dampers (TMDs) are extremely effective vibration absorbers in tall flexible structures, but prone to get de-tuned due to accidental changes in structural properties, alteration in operating conditions, and incorrect design forecasts. Presence of closely spaced modes in structures coupled with TMDs renders output-only modal identification difficult. Over the last decade, second-order BSS algorithms have shown significant promise in the area of ambient modal identification. These methods employ joint diagonalization of covariance matrices of measurements to estimate the mixing matrix (mode shape coefficients) and sources (modal responses). Recently, PARAFAC BSS model has evolved as a powerful multi-linear algebra tool for decomposing an nth order tensor into a number of rank-1 tensors. This method is utilized in the context of modal identification in the present study. Covariance matrices of measurements at several lags are used to form a 3rd order tensor and then PARAFAC decomposition is employed to obtain the desired number of components, comprising of modal responses and the mixing matrix. The strong uniqueness properties of PARAFAC models enable direct source separation with fine spectral resolution even in cases where the number of sensor observations is less compared to the number of target modes, i.e., the underdetermined case. This capability is exploited to separate closely spaced modes of the TMDs using partial measurements, and subsequently to estimate modal parameters. The proposed method is validated using extensive numerical studies comprising of multi-degree-of-freedom simulation models equipped with TMDs, as well as with an experimental set-up.
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Suman Kalyan Sadhu,Phanikanth Jogam,Kranthikumar Gande,Raghu Banoth,Suprasanna Penna,Venkataiah Peddaboina 한국식물생명공학회 2022 JOURNAL OF PLANT BIOTECHNOLOGY Vol.49 No.1
In this study, we developed a reliable and efficient Agrobacterium-mediated genetic transformation system by applying sonication and vacuum infiltration to six chickpea cultivars (ICCV2, ICCV10, ICCV92944, ICCV37, JAKI9218, and JG11) using embryo axis explants. Wounded explants were precultured for 3 days in shoot induction medium (SIM) before sonication and vacuum infiltration with an Agrobacterium suspension and co-cultivated for 3 days in co-cultivation medium containing 100 µM/l of acetosyringone and 200 mg/l of L-cysteine. Responsive explants with putatively transformed shoots were selected using a gradual increase in kanamycin from 25 mg/l to 100 mg/l in selection medium to eliminate escapes. Results showed optimal transformation efficiency at a bacterial density of 1.0, an optical density at 600 nm wavelength (OD600), and an infection duration of 30 min. The presence and stable integration of the β-glucuronidase (gusA) gene into the chickpea genome were confirmed using GUS histochemical assay and polymerase chain reaction. A high transformation efficiency was achieved among the different factors tested using embryo axis explants of cv. JAKI 9218. Of the six chickpea cultivars tested, JAKI9218 showed the highest transformation efficiency of 8.6%, followed by JG11 (7.2%), ICCV92944 (6.8%), ICCV37 (5.4%), ICCV2 (4.8%), and ICCV10 (4.6%). These findings showed that the Agrobacterium-mediated genetic transformation system will help transfer novel candidate genes into chickpea.
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Total Synthesis of Azasugar 1,4-Dideoxy-1,4-imino-D-galacitol
Partha Sarathi Sadhu,Amlipur Santhoshi,Vaidya Jayathirtha Rao,강한영,강성호 대한화학회 2012 Bulletin of the Korean Chemical Society Vol.33 No.11
A new highly stereoselective synthesis of pyrrolidine azasugar 1,4-dideoxy-1,4-imino-D-galacitol is being reported herein. The synthesis was achieved in a linear sequence and inexpensive chiral source (+)-diethyl tartarate was used as the starting material. The key step involved during the synthesis was Pd catalysed amino cyclization of alkenylamine, Bose modified Mitsunobu reaction and Sharpless asymmetric dihydroxylation.
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A New Single Phase Multilevel Inverter Topology with Two-step Voltage Boosting Capability
Roy, Tapas,Sadhu, Pradip Kumar,Dasgupta, Abhijit The Korean Institute of Power Electronics 2017 JOURNAL OF POWER ELECTRONICS Vol.17 No.5
In this paper, a new single phase multilevel inverter topology with a single DC source is presented. The proposed topology is developed based on the concepts of the L-Z source inverter and the switched capacitor multilevel inverter. The input voltage to the proposed inverter is boosted by two steps: the first step by an impedance network and the second step by switched capacitor units. Compared to other existing topologies, the presented topology can produce a higher boosted multilevel output voltage while using a smaller number of components. In addition, it provides more flexibility to control boosting factor, size, cost and complexity of the inverter. The proposed inverter possesses all the advantages of the L-Z source inverter and the switched capacitor multilevel inverter like controlling the start-up inrush current and capacitor voltage balancing using a simple switching strategy. The operating principle and general expression for the different parameters of the proposed topology are presented in detail. A phase disposition pulse width modulation strategy has been developed to switch the inverter. The effectiveness of the topology is verified by extensive simulation and experimental studies on a 7-level inverter structure.
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