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Shinde, K. P.,Jang, S. H.,Kim, J. W.,Kim, D. S.,Ranot, M.,Chung, K. C. The Royal Society of Chemistry 2015 Dalton transactions Vol.44 No.47
<P>We report for the first time the synthesis of nanopowders of TbN, DyN and HoN crystallized in a cubic structure by the plasma arc discharge (PAD) method and investigate their magnetocaloric properties for magnetic refrigeration applications. The nitridization of terbium, dysprosium and holmium was obtained using a mixture of nitrogen and argon gas inside a discharge chamber with 4 kPa pressure. The structural and microstructural properties of these rare earth nitrides were investigated by using X-ray diffraction and transmission electron microscopy. The studied nitrides undergo a second-order ferromagnetic to paramagnetic phase transition at Curie temperatures of 35.7, 19.9 and 14.2 K for TbN, DyN and HoN, respectively. The magnetocaloric effects were estimated by calculating the magnetic entropy changes from the magnetization data sets measured at the different applied magnetic fields and temperatures. The changes in entropy −Δ<I>S</I><SUB>M</SUB> were found to be 12.0, 13.6 and 24.5 J kg<SUP>−1</SUP> K<SUP>−1</SUP> at an applied magnetic field of 5 T.</P> <P>Graphic Abstract</P><P>We report for the first time the synthesis of nanopowders of TbN, DyN and HoN crystallized in a cubic structure by the plasma arc discharge (PAD) method and investigate their magnetocaloric properties for magnetic refrigeration applications. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c5dt03528g'> </P>
Cytotoxic Polyketides from the Marine Sponge Discodermia calyx
Shinde, Pramod B.,Mansoor, Tayyab A.,Luo, Xuan,Hong, Jong-Ki,Lee, Chong-O.,Jung, Jee-H. Korean Chemical Society 2007 Bulletin of the Korean Chemical Society Vol.28 No.6
Bioassay-guided fractionation of the MeOH extract from the sponge Discodermia calyx collected off the coast of Jeju Island, South Korea, led to the isolation of a polyketide, icadamide C (1), along with previously reported theopederin K (3). Structure elucidation was performed by a combination of high resolution mass and 2D-NMR (principally COSY, HMBC, HSQC, and NOESY) spectroscopy. Stereochemistry of compound 1 was determined as 2R*, 3R*, 6R*, 10S*, 11S*, 12R*, 13S*, 15R* and 2'S by NMR data and Marfey analysis. Isolated metabolites displayed potent cytotoxic activity against a small panel of five human solid tumor cell lines with ED50 values of less than 0.1 μg/mL.
Shinde Vijaysingh,A. Dutta,A. Saxena,B. Panda,T. Maji 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
In the last few decades there have been several papers in the area of swarm robotics, in which researchers have considered the capture or transfer of an object using a large number of robots or agents. However in these cases the capture and transportation processes have not been optimized in terms of the minimum number of agents required or the best paths. We have earlier proposed the optimal capture and transportation of a moving object using only four agents. This paper is a further extension of our earlier work in which we experimentally evaluate the performance of the multi agent system to capture and transfer a moving 2D prismatic object avoiding obstacles using the least number of agents.A closed loop system is developed using a vision system that can optimally find the goal points on a moving object and control the robots to capture the object. After the object is captured it is optimally guided to the goal point. The results prove that the system can operate autonomously and in real time.
Photovoltaic properties of nanocrystalline SnSe-CdS
Shinde, D.V.,Min, S.K.,Sung, M.M.,Shrestha, N.K.,Mane, R.S.,Han, S.H. North-Holland 2014 Materials letters Vol.115 No.-
We report for the first time, a high performance photovoltaic cell utilizing earth abundant absorber SnSe, fabricated in thin film form by electrodeposition technique. A solid state device fabricated using CdS as window layer exhibited 0.8% efficiency while using a polysulfide electrolyte in presence of platinum counter electrode exhibited 1.4% solar to electric power conversion efficiency.
Shinde, S. S.,Kim, D. H.,Yu, J. Y.,Lee, J. H. Royal Society of Chemistry 2017 Nanoscale Vol.9 No.21
<P>The rational design of stable, inexpensive catalysts with excellent hydrogen dynamics and sorption characteristics under realistic environments for reversible hydrogen storage remains a great challenge. Here, we present a simple and scalable strategy to fabricate a monodispersed, air-stable, magnesium hydride embedded in three-dimensional activated carbon with periodic synchronization of transition metals (MHCH). The high surface area, homogeneous distribution of MgH2 nanoparticles, excellent thermal stability, high energy density, steric confinement by carbon, and robust architecture of the catalyst resulted in a noticeable enhancement of the hydrogen storage performance. The resulting MHCH-5 exhibited outstanding hydrogen storage performance, better than that of most reported Mg-based hydrides, with a high storage density of 6.63 wt% H-2, a rapid kinetics loading in < 5 min at 180 degrees C, superior reversibility, and excellent long-term cycling stability over similar to 435 h. The significant reduction of the enthalpy and activation energy observed in the MHCH-5 demonstrated enhancement of the kinetics of de-/hydrogenation compared to that of commercial MgH2. The origin of the intrinsic hydrogen thermodynamics was elucidated via solid state H-1 NMR. This work presents a readily scaled-up strategy towards the design of realistic catalysts with superior functionality and stability for applications in reversible hydrogen storage, lithium ion batteries, and fuel cells.</P>
Shinde, Pravin S.,Annamalai, Alagappan,Kim, Jae Young,Choi, Sun Hee,Lee, Jae Sung,Jang, Jum Suk American Chemical Society 2015 The Journal of Physical Chemistry Part C Vol.119 No.10
<P>High:quality hematite (alpha-Fe2O3) photoanodes were syritheSized from a sulfate electrolyte bath by the pulse reverse electrodeposition (PRED) method. The influence of PRED parameters (viz, duty cycle, pulse period, and deposition time) was systematically investigated on the structural, optical, morphological, and photo electrochemical properties of the films. The optimized parameters of pulse duty cycle, pulse:period, and the deposition time were 20%, 10 ms, and 45 s, respectively. The granular and compact nanocrystalline morphology of the alpha-Fe2O3 was found to alter according to the process parameters. The alpha-Fe2O3 electrodes (film thickness similar to 200 nm) prepared by annealing at 550 degrees C for 4 h followed by 800 degrees C for 15 min exhibited an optimum photocurrent density of 504 mu A cm(-2) measured at 1.23 V vs RHE in 1 M NaOH electrolyte under 100 mW cm(-2) light illumination.</P>
Shinde, S. S.,Sami, Abdul,Lee, Jung-Ho The Royal Society of Chemistry 2015 Journal of Materials Chemistry A Vol.3 No.24
<P>Electrocatalytic hydrogen evolution using non-precious metals or metal-free catalysts is critically necessary because platinum-based electrocatalysts are greatly limited in scalable commercialization of hydrogen generation due to their high cost. Here, we report the facile synthesis of metal-free hybrid catalysts, in which graphitic carbon nitride (g-C3N4) is coupled with nanoporous graphene doped by S and Se. The S and Se co-doped hybrid catalyst (g-C3N4@S-Se-pGr) reveals superior electrocatalytic performances, including an exchange current density of 6.27 × 10<SUP>−6</SUP>A cm<SUP>−2</SUP>, an on-set potential of 0.092 V, a Tafel slope of 86 mV dec<SUP>−1</SUP>, an adsorption free energy of −0.13 eV, and long-term stability comparable to those of commercial Pt/C catalysts. Volcano plots showing the hydrogen evolution activity<I>versus</I>adsorption free energy are also compatible with those of the conventional metal catalysts. Our strategy has the potential to allow a new paradigm for the development of high-performance metal-free electrocatalysts for energy conversion devices.</P>
Shinde, P.B.,Han, A.R.,Cho, J.,Lee, S.R.,Ban, Y.H.,Yoo, Y.J.,Kim, E.J.,Kim, E.,Song, M.C.,Park, J.W.,Lee, D.G.,Yoon, Y.J. Elsevier Science Publishers 2013 Journal of biotechnology Vol.168 No.2
Expression plasmids carrying different deoxysugar biosynthetic gene cassettes and the gene encoding a substrate-flexible glycosyltransferase DesVII were constructed and introduced into Streptomyces venezuelae YJ003 mutant strain bearing a deletion of a desosamine biosynthetic (des) gene cluster. The resulting recombinants produced macrolide antibiotic YC-17 analogs possessing unnatural sugars replacing native d-desosamine. These metabolites were isolated and further purified using chromatographic techniques and their structures were determined as d-quinovosyl-10-deoxymethynolide, l-rhamnosyl-10-deoxymethynolide, l-olivosyl-10-deoxymethynolide, and d-boivinosyl-10-deoxymethynolide on the basis of 1D and 2D NMR and MS analyses and the stereochemistry of sugars was confirmed using coupling constant values and NOE correlations. Their antibacterial activities were evaluated in vitro against erythromycin-susceptible and -resistant Enterococcus faecium and Staphylococcus aureus. Substitution with l-rhamnose displayed better antibacterial activity than parent compound YC-17 containing native sugar d-desosamine. The present study on relationships between chemical structures and antibacterial activities could be useful in generation of novel advanced antibiotics utilizing combinatorial biosynthesis approach.