http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Controllable synthesis of nanohorn-like architecture cobalt oxide for asymmetric supercapacitors
( Periyasamy Sivakumar ),박호석 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
Herein, we report a facile, scalable, and the effective shape-controlled nanohorn-like structured cobalt oxide materials have been successfully synthesized through solvothermal strategy followed by calcining at different temperature. To the best of our knowledge, it is the first report of the nanohorns-like structure of cobalt oxide synthesized through template or surfactant free methods. More prominently, electrochemical measurements reveal that the size and calcining temperature affects their electrochemical properties. Because the tunable surface components and defects of the obtained active electrode materials can be accom- plished with the help of simply controlling the calcination temperature without change the morphology. The obtained electrodes show high specific capacitance and high cycle performance after 10000 cycles. In addition, the low resistance and exceptional cycling stability, making them promising materials for supercapacitor application.
Enhanced Fermentative Hydrogen Production from Galactose using Bioaugmentation Strategy
( Periyasamy Sivagurunathan ),( Anburajan Parthiban ),( Gopalakrishnan Kumar ),( Sang Hyoun Kim ) 한국폐기물자원순환학회(구 한국폐기물학회) 2015 한국폐기물자원순환학회 3RINCs초록집 Vol.2015 No.-
This study evaluated the feasibility of anaerobic hydrogen fermentation of galactose (red algal biomass sugar) using individual and bioaugmented mixed cultures. Heat-treated (80ºC 30 min) samples of granular sludge and digester sludge were used as inoculum source and their individual and bioaugmentive role on hydrogen production were examined in batch tests. Among the tested individual inoculum, granular sludge provided the maximum hydrogen production rate (HPR) and hydrogen yield (HY) of 2.8 L/L-d and 0.64 mol/mol galctoseadded. Bioaugmented (granular sludge+ digester sludge) mixed culture showed a peak HPR and HY of 3.2 L/L-d and 0.84 mol/mol galctose added, respectively. The results showed that there was a significant improvement in hydrogen production performances were observed when the individual hat-treated mixed cultures were added together. The hydrogen content was maintained over ~52% in both individual and bioaugmented cultures. The sugar consumption rate was more than 90% in all cases. The soluble metabolic products analysis revealed that butyrate and acetate was the major dominant metabolic products. This study proved that bioaugmentation could be a feasible strategy for improving hydrogen production from galactose and to solve the energy issue in the future.
Periyasamy Ashok Kumar,Muthu Manikandan,Vijayaraghavan Kannan 한국생물공학회 2010 Biotechnology and Bioprocess Engineering Vol.15 No.4
Medium optimization for the nuclease (RNase)production by Bacillus firmus VKPACU-1 was studied using the one-factor-at-a-time method and Response Surface Methodology (RSM). One-factor-at-a-time methodology was used to study the effects of carbon, nitrogen, phosphorus sources, and physical conditions such as pH and temperature, on nuclease (RNase) production. After optimizing the carbon (glucose) and nitrogen (tryptone) sources in the culture medium the physical conditions, pH (6.5) and temperature (35°C) were also optimized. Later these conditions were chosen as the main factors and used in the experimental design. The central composite design (CCD)of the RSM was employed to evaluate the interactive effects of these four variables. The optimized values obtained by the statistical analysis showed that glucose 5.95 g/L, tryptone 22.5 g/L, pH 6.5, and temperature 35°C affected maximum nuclease (RNase) production. When utilizing these proposed optimized conditions, the model predicted nuclease (RNase) production of 43.6 U/mL and in the validation experiments, the nuclease production obtained was 46.5 U/mL. The nuclease production in medium optimized by RSM was 26% higher, than in the non-optimized medium.
( Periyasamy Sivakumar ),( Milan Jana ),( Manikantan Kota ),이현선,박호석 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
We report a simple hydrothermal route to prepare the interconnected porous NiCo<sub>2</sub>O<sub>4</sub> nanosheets for hybrid supercapacitor applications. The obtained NiCo<sub>2</sub>O<sub>4</sub> nanosheets shows a much higher specific capacitance of 3137 F g<sup>-1</sup> at a current density of 2 A g<sup>-1</sup> and 2420 F g<sup>-1</sup> at 20 A g<sup>-1</sup>, indicating excellent rate capability. Furthermore, a hybrid supercapacitor (HSC) was constructed with the NiCo<sub>2</sub>O<sub>4</sub> nanosheets and the nitrogen- and sulfur-codoped reduced graphene oxide as the positive and negative electrodes, respectively. The fabricated HSC delivered a high operating voltage window up to 1.5 V with energy density of 33.64 W h kg<sup>-1</sup>, a maximum power density of 14.4 kW kg<sup>-1</sup>, and satisfactory long-term stability with 125% retention over 12,000 charge/discharge cycles. The impressive performances of the prepared electrode material are a promising candidate for low-cost and high-performance energy storage device applications.
A Review on Evolution of Aeroelastic Assisted Wing
Periyasamy Sivanandi,Chirag Gupta,Hari Durai 한국항공우주학회 2023 International Journal of Aeronautical and Space Sc Vol.24 No.3
Aeroelastic wings have a significant capacity like normal flyers, to improve the aircraft's overall performance and maneuverability. It is a plugin that allows changing the airfoil-level morphing like changing wing airfoil, wing camber and wing-level morphing like changing the wing reference area, aspect ratio, sweep, twist, folding, and the angle of attack (AOA) in the wing’s various portions. By dynamically adjusting or enhancing the shape for various flight conditions beyond the current ideas, there are still many new openings. The most prominent forms of morphing mechanisms used mostly for 2D and 3D wing configurations are examined in this research. The technology that is commonly utilized to develop and analyze an aeroelastic wing is thoroughly examined. Adapting morphing technology for practical purposes is highly challenging, and several reasons for this are also considered during the review process.
Sivagurunathan, Periyasamy,Kumar, Gopalakrishnan,Park, Jeong-Hoon,Park, Jong-Hun,Park, Hee-Deung,Yoon, Jeong-Jun,Kim, Sang-Hyoun Pergamon Press 2016 International journal of hydrogen energy Vol.41 No.7
<P><B>Abstract</B></P> <P>This research investigated the suitability of enriched mixed cultures (EMC) for anaerobic hydrogen fermentation in continuous operation. EMC was prepared after four successive transfers in PYG (peptone, yeast extract and galactose) medium in batch cultivation. The peak hydrogen production rate (HPR) and hydrogen yield (HY) of 770 ± 10 mL H<SUB>2</SUB>/L-d and 1.05 ± 0.06 mol H<SUB>2</SUB>/mol galactose<SUB>added</SUB>, were attained respectively. There forward a continuously stirred tank reactor (CSTR) has been operated with the substrate concentration of 15 g/L at a hydraulic retention time (HRT) of 12 h for more than 15 days by using EMC. The performance showed that HPR and HY were fluctuated significantly during the operation and the average values were 1710 ± 250 mL H<SUB>2</SUB>/L-d and 0.82 ± 0.12 mol H<SUB>2</SUB>/mol galactose<SUB>added</SUB>, respectively. The soluble metabolic products analysis revealed that butyrate, lactate and acetate were the dominant metabolic products with less quantity of propionic and formic acids. The microbial community structure has been determined by next generation DNA sequencing technique and revealed <I>Clostridium</I> sp. was the dominant microbial consortium during repeated batch transfer, whereas <I>Sporolactobacillus</I> sp. was the major population in continuous operation. This study demonstrates that operational mode (batch and continuous) significantly influence the microbial diversity and hydrogen production, and EMC obtained by repeated process may not be suitable for continuous hydrogen fermentation.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Repeated batch transfer provided H<SUB>2</SUB> producing enriched mixed cultures (EMC). </LI> <LI> <I>Clostridium</I> sp. was the dominant microbial population in EMC. </LI> <LI> <I>Sporolactobacillus</I> sp. was the major population during continuous H<SUB>2</SUB> production. </LI> </UL> </P>
M. Periyasamy,R. Dhanasekaran 한국자기학회 2015 Journal of Magnetics Vol.20 No.3
We evaluated certain issues related to magnetic resonance imaging (MRI) coupled with the use of active 2.5 GHz radio frequency identification (RFID) tags for patient identification using low field (0.3 T) MRI and computed tomography (CT) scans. We also investigated the performance of the RFID reader located outside the MRI room by considering several factors. A total of ten active RFID tags were exposed to several MRI sequences and X-rays of CT scan. We found that only card type active RFID tags are suitable for patient identification purpose in MRI environment and both wristbands as well as card tags were suitable for the same in CT environment. Severe artifacts were found in the captured MRI and CT images when the area of the imaging was in proximity to the tags. No external factors affected the performance of active RFID reader stationed outside the MRI scan room.