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        • Experimental and Computational Studies on the Reentry Capsule Aerodynamics with a Flap

          Senthil Kumar,J K Prasad,Kim H D 한국추진공학회 2016 한국추진공학회 학술대회논문집 Vol.2016 No.5

          Flow field around a typical reentry capsule has been investigated adopting experiments and computations. The reentry capsule has the flap which could be useful to obtain control force. All the studies have been made at a free stream Mach number of 2 and Reynolds number of 30 X 106. Experiments consisted of schlieren flow visualization and measurement of axial force only. Three dimensional computation has been made using FLUENT and adopting k-ω turbulence model. Effect of angle of attack and flap angle has been obtained. Based on present study, it is observed the flap increases the axial force.

        • KCI등재

          UV-Blue Light Emission from ZnO Nanoparticles

          Obuliraj Senthilkumar,Kazuki Yamauchi,Kasilingam Senthilkumar,Takahiro Yamamae,Yasuhisa Fujita,Naoki Nishimoto 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.1

          Gas evaporation was employed to prepare nitrogen-doped ZnO nanoparticles, which showed in- tense UV/blue emission (380 nm) at room temperature. The thin lms were deposited by dip coating with nanoparticles dispersed in isopropanol and water. The PL spectrum showed dominant acceptor bound excitons around 371 nm at low temperatures, which was due to the substitution of nitrogen acceptors in oxygen sites. Nitrogen doping was also conrmed from Raman spectroscopy, which showed a nitrogen-related local vibrational mode (LVMN) at 583 cm-1. Gas evaporation was employed to prepare nitrogen-doped ZnO nanoparticles, which showed in- tense UV/blue emission (380 nm) at room temperature. The thin lms were deposited by dip coating with nanoparticles dispersed in isopropanol and water. The PL spectrum showed dominant acceptor bound excitons around 371 nm at low temperatures, which was due to the substitution of nitrogen acceptors in oxygen sites. Nitrogen doping was also conrmed from Raman spectroscopy, which showed a nitrogen-related local vibrational mode (LVMN) at 583 cm-1.

        • KCI등재

          Progressive muscle relaxation technique on anxiety and depression among persons affected by leprosy

          Senthilkumar Ramasamy,Suganya Panneerselvam,Pitchaimani Govindharaj,Archana Kumar,Rashmi Nayak 한국운동재활학회 2018 JER Vol.14 No.3

          Anxiety and depression have been found to be increasing among peo-ple with leprosy and it may lead to decreased social participation. The progressive muscle relaxation technique (PMRT) is widely used today in choice of treatment for reducing the anxiety and depression. This study aimed to assess the effectiveness of PMRT in reducing anxiety and depression among the hospitalized leprosy affected person in a tertiary care centre. This study is a case series of 50 leprosy affected people aged between 18–60 years who were admitted for leprosy com-plications in tertiary leprosy referral hospital. The Anxiety-Depression scale was developed and validated by the investigators and adminis-tered before intervention of PMRT and after 2 weeks. The follow-up as-sessment was done at 6 weeks after the initial intervention. The finding shows that a statistically significant difference was observed on anxiety domain before and after application of PMRT. The anxiety means score showed steady decline from 6.76 at pretest to 3.0 (t=25.068, P≤0.001) at post test and 1.12 (t=22.679, P≤0.001) at follow-up. In depression do-main, a statistically significant difference was seen in before and after application of PMRT. The depression means score showed steady de-cline from 6.92 at pre test to 3.28 (t=16.082, P≤0.001) at post test and to 1.16 (t=18.918, P≤0.001) at follow-up. This study proved that the PMRT as a valid treatment option for hospitalized person with leprosy in mini-mizing the anxiety and depression related symptoms and to benefit the psychosocial wellbeing of leprosy affected patients.

        • KCI등재

          A comprehensive assessment on performance behavior of a CI engine using bio oil emulsions (PJSO10, KSO10 and CSO10) as fuels

          Senthilkumar Masimalai,Venkatesan Kuppusamy 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.10

          This paper aims at evaluating the performance of bio oils obtained from pyrolysis of three different biomass (namely Prosopis Julifloraseeds-PJS, Coconut shell-CS and Kiker seeds-KS) as fuels in a compression ignition engine. A single cylinder diesel engine developing apower output of 3.7 kW at 1500 rpm was used. A comparative study was made on the engine’s performance, emission and combustionbehavior of three bio oils by converting them into their emulsions. Bio oil emulsions (namely PJSO10-Prosopis Juliflora emulsion,CSO10-Coconut shell emulsion and KSO10-Kiker seed emulsion) were prepared by mixing 10% of bio oils in the presence of 3% of asurfactant (span 80) with 87% of diesel by volume. Emulsions were tested in a single cylinder diesel engine for their performance as fuel. Engine test results showed comparable performance with all the emulsions of bio oil as compared to BD (Base diesel). CSO10 indicatedthe brake thermal efficiency very close to BD at all power outputs among the tested emulsions. Considerable reduction in smoke andNOx emissions were observed with all the emulsions of bio oil as compared to BD at all power outputs. Cylinder peak pressure andmaximum rate of pressure rise indicated close values to BD at all power outputs with all the emulsions. Ignition delay was found ashigher with all the tested emulsions as compared to BD at all power outputs. From the experimental findings it was concluded that biooils obtained from Prosopis Juliflora seeds-PJS, Coconut shell-CS and Kiker seeds-KS can be used upto 10% by volume (without anymodifications in the engine) as partial replacement of diesel by making emulsions with diesel with comparable performance and considerablereduction in smoke and NOx emissions. Among the emulsions the best choice can be CSO10 for better thermal efficiency andreduced emissions.

        • Highly porous graphitic carbon and Ni<sub>2</sub>P<sub>2</sub>O<sub>7</sub> for a high performance aqueous hybrid supercapacitor

          Senthilkumar, Baskar,Khan, Ziyauddin,Park, Seungyoung,Kim, Kyoungho,Ko, Hyunhyub,Kim, Youngsik The Royal Society of Chemistry 2015 Journal of Materials Chemistry A Vol.3 No.43

          <▼1><P>A high energy hybrid capacitor fabricated from highly porous graphitic carbon and novel electrode material Ni2P2O7 delivers a maximum energy density of 65 W h kg<SUP>−1</SUP> at a power density of 800 W kg<SUP>−1</SUP>, good rate capability and cycling stability in an aqueous Na-ion based electrolyte.</P></▼1><▼2><P>An aqueous Na-ion based hybrid capacitor has been successfully developed by using highly porous graphitic carbon (HPGC) derived from waste writing paper and a new electrode material as a negative and positive electrode, respectively. HPGC was prepared <I>via</I> hydrothermal carbonization and subsequent KOH activation of waste writing paper which showed a highly porous stacked sheet-like morphology with an exceptionally high BET specific surface area (1254 m<SUP>2</SUP> g<SUP>−1</SUP>). HPGC exhibited typical electrical double layer capacitor (EDLC) behavior with a high specific capacitance of 384 F g<SUP>−1</SUP> and good negative working potential (−1.0 V) in an aqueous electrolyte. On the other hand, Ni2P2O7 was synthesized by a simple co-precipitation technique and tested as a cathode material which delivered a maximum specific capacitance of 1893 F g<SUP>−1</SUP> at 2 A g<SUP>−1</SUP> current density. The fabricated HPGC‖Ni2P2O7 hybrid device displayed excellent cyclic stability up to 2000 cycles and delivered a maximum energy density of 65 W h kg<SUP>−1</SUP> at 800 W kg<SUP>−1</SUP> power density in a Na-ion based aqueous electrolyte.</P></▼2>

        • Graphene oxide self-assembled with a cationic fullerene for high performance pseudo-capacitors

          Senthilkumar, Krishnan,Prabakar, S. J. Richard,Park, Chunkuk,Jeong, Seok,Lah, Myoung Soo,Pyo, Myoungho The Royal Society of Chemistry 2016 Journal of Materials Chemistry A Vol.4 No.5

          <▼1><P>Control of the microstructures of graphene oxide is realized by introducing a cationic fullerene, resulting in a high-performance pseudo-capacitor.</P></▼1><▼2><P>Control of the microstructures of graphene oxide (GO) is realized by introducing a cationic fullerene (CFU), resulting in a high-performance pseudo-capacitor. The strong electrostatic interaction between anionic GO and the CFU produces a self-assembled composite (GO/CFU), in which the CFU units intervene to form randomly stacked GO layers. The CFU acts as a spacer between GO layers, allowing a significant fraction of the oxygen-functional groups of GO to be redox-active. When tested as a pseudo-capacitor in 1.0 M H2SO4, the optimized GO/CFU composite delivers a capacitance of 357 F g<SUP>−1</SUP> at 0.4 A g<SUP>−1</SUP>, in contrast to 160 F g<SUP>−1</SUP> for GO alone, which is one of the greatest values reported for graphene composites with electro-inactive carbonaceous entities. The improvement in the capacitance by CFU incorporation is also evidenced at a high charge/discharge rate (285 and 137 F g<SUP>−1</SUP> at 5 A g<SUP>−1</SUP> for GO/CFU and GO, respectively). As a result, the GO/CFU composite delivers an energy density of 40 W h kg<SUP>−1</SUP> and a power density of 2793 W kg<SUP>−1</SUP> at 5 A g<SUP>−1</SUP>, in contrast to 19 W h kg<SUP>−1</SUP> and 2748 W kg<SUP>−1</SUP> for GO alone. During 5000 charge/discharge cycles at 5 A g<SUP>−1</SUP>, the capacitance of the GO/CFU composite increases slightly (4% increase in GO/CFU <I>vs.</I> 4% decrease in GO), which validates the effectiveness of a self-assembly strategy for high performance supercapacitor applications.</P></▼2>

        • SCISCIESCOPUS

          Potentiostatic activation of as-made graphene electrodes for high-rate performance in supercapacitors

          Senthilkumar, K.,Jeong, S.,Lah, M.S.,Sohn, K.S.,Pyo, M. Elsevier Sequoia 2016 Journal of power sources Vol.329 No.-

          A thermally expanded graphene oxide (EGO) electrode is electrochemically activated to simultaneously introduce electrolyte-accessible mesopores and oxygen functional groups. The former is produced via O<SUB>2</SUB> evolution and the latter is incorporated by the intermediate hydroxyl radicals generated during the potentiostatic oxidation of H<SUB>2</SUB>O in 1 M H<SUB>2</SUB>SO<SUB>4</SUB> at 1.2 V (vs. Ag/AgCl). When applied as a supercapacitor, the potentiostatically treated EGO (EGO-PS) shows significant enhancement in an electric-double layer (EDL) process with a noticeable Faradaic reaction and delivers high capacitance at fast charge/discharge (C/D) rates (334 F g<SUP>-1</SUP> at 0.1 A g<SUP>-1</SUP> and 230 F g<SUP>-1</SUP> at 50 A g<SUP>-1</SUP>). In contrast to EGO-PS, EGO that is oxidized potentiodynamically (EGO-PD) shows negligible enhancement in EDL currents. EGO that is subjected to successive potential pulses also shows behaviors similar to EGO-PD, which indicates the importance of hydroxyl radical accumulation via a potentiostatic method for simultaneous functionalization and microstructural control of graphenes. The potentiostatic post-treatment presented here is a convenient post-treatment strategy that could be used to readily increase capacitance and simultaneously improve the high-rate performance of carbon-based electrodes.

        • Flexible and wearable fiber shaped high voltage supercapacitors based on copper hexacyanoferrate and porous carbon coated carbon fiber electrodes

          Senthilkumar, S. T.,Kim, J.,Wang, Y.,Huang, H.,Kim, Y. Royal Society of Chemistry 2016 Journal of Materials Chemistry A Vol.4 No.13

          <P>In this work, we report the fabrication of a new high voltage hybrid fiber supercapacitor (HFSC) with porous carbon coated carbon fibers (PC@CFs) as the negative electrode and copper hexacyanoferrate coated carbon fibers (CuHCF@CFs) as the positive electrode. Carbon fibers (CFs) were used as both the substrate and the current collector due to their good conductivity, high flexibility, good mechanical strength, and light weight. The as-fabricated HFSC can be cycled reversibly in the range of 0-2 V and exhibits excellent electrochemical performance with a specific capacitance of 19.2 F g(-1) (68.2 mF cm(-2) or 3.1 F cm(-3)) and an energy density of 10.6 W h kg(-1) (180.85 mu Wh cm(-2) or 8.11 mW h cm(-3)), better than those reported in the previous literature. Additionally, the HFSCs have retained their original electrochemical performance even after bending, suggesting good flexibility of the device. The promising results show great potential in developing HFSCs with CuHCF@CFs and PC@CFs electrodes for practical wearable devices.</P>

        • KCI등재

          Enterourachal Fistula as an Initial Presentation in Crohn Disease

          Senthilkumar Sankararaman,Ramy Sabe,Thomas J. Sferra,Ali Salar Khalili 대한소아소화기영양학회 2019 Pediatric gastroenterology, hepatology & nutrition Vol.22 No.1

          Crohn disease has a wide spectrum of clinical presentations and rarely can present with complications such as a bowel stricture or fistula. In this case report, we describe a 17-year-old male who presented with a history of recurrent anterior abdominal wall abscesses and dysuria. He was diagnosed with Crohn disease and also found to have a fistulous communication between the terminal ileum and a patent urachus. An ileocecectomy with primary anastomosis and complete resection of the abscess cavity was performed. He is on azathioprine for maintenance therapy and currently in remission. Clinicians should have a high index of suspicion for this complication in Crohn disease patients presenting with symptoms suggestive of urachal anomalies such as suprapubic abdominal pain, dysuria, umbilical discharge, and periumbilical mass.

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