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Preparation of Biomass Based Carbon for Electrochemical Energy Storage Application
Harshini Priyaa, V.S.,Saravanathamizhan, R.,Balasubramanian, N. The Korean Electrochemical Society 2019 Journal of electrochemical science and technology Vol.10 No.2
The activated carbon materials were prepared from waste biomass by ultrasonic assisted chemical activation method (UCA), ultrasonic assisted physical activation method (UPA) and Manganese nitrogen doped carbon (Mn/N-C). The XRD result shows the turbostatic (fully disordered) structure. The cyclic voltammetry test was done at 50 mV/s using 1M sodium sulfate and the values of specific capacitance were found to be 93, 100 and 115 F/g for UCA, UPA and Mn/N-C respectively. The power density values for the samples UCA, UPA and Mn/N-C were found to be 46.04, 87.97 and 131.42 W/kg respectively. The electrochemical impedance spectroscopy was done at low frequency between 1 to 10 kHz. The Nyquist plot gives the resistant characteristics of the materials due to diffusional resistance at the electrode-electrolyte interface. The Energy Dispersive X-Ray Spectroscopyanalysis (EDAX) analysis showed that the percentage doping of nitrogen and manganese were 3.53 wt% and 9.44 wt% respectively. It is observed from the experiment Mn/N-C doped carbon show good physical and electrochemical properties.
Harshiny Muthukumar,Nivedhini Iswarya Chandrasekaran,Samsudeen Naina Mohammed,Saravanan Pichiah,Matheswaran Manickam 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.45 No.-
The synthesis of Azadirachta indica leaf extract mediated Iron oxide nanoparticles (FeO-NPs) from ferricchloride were investigated. The characterization results confirmed that FeO-NPs were having goodphysicochemical traits. The FeO-NPs hold the resistance in ohmic range and coercivity value reached126emu/g. The FeO-Nps antioxidant efficiency was observed to be 95% of inhibition against 1, 1-diphenyl-2-picrylhydrazyl. The indigo-carmine dye decolourization of 79 and 85% under sunlight andUV-light irradiance were attained for FeO-NPs. The antibacterial and antibiofilm activities of FeO-NPsagainst bacterial pathogen were tested. The results confirmed that FeO-NPs have a virtuous propensityagainst gram negative than positive bacteria.
Tissue engineering a tendon-bone junction with biodegradable braided scaffolds
Harshini Ramakrishna,Tieshi Li,Ting He,Joseph Temple,Martin W. King,Anna Spagnoli 한국생체재료학회 2019 생체재료학회지 Vol.23 No.2
Background: Tendons play an important role in transferring stress between muscles and bones and in maintaining the stability of joints. Tendon tears are difficult to heal and are associated with high recurrence rates. So, the objective of this study was to develop a biodegradable scaffold for tendon-bone junction regeneration. Methods: Two types of polylactic acid (PLA) yarns, having fibers with round and four deep grooved cross-sections, were braided into tubular scaffolds and cultured with murine Transforming growth factor beta type II receptor (Tgfbr2)-expressing joint progenitor cells. The scaffolds were designed to mimic the mechanical, immuno-chemical and biological properties of natural mouse tendon-bone junctions. Three different tubular scaffolds measuring 2mm in diameter were braided on a Steeger 16-spindle braiding machine and biological and mechanical performance of the three scaffolds were evaluated. Results: The mechanical test results indicated that three different braided scaffold structures provided a wide range of mechanical properties that mimic the components of tendon bone junction and results of the biological tests confirmed cell viability, active cell attachment and proliferation throughout all three scaffolds. Conclusions: This study has identified that the three proposed types of braided scaffolds with some improvement in their structures have the potential to be used as scaffolds for the regeneration of a tendon bone tissue junction.
Harshini, D.,Lee, D. H.,Kim, Y.,Nam, S. W.,Han, J. H.,Ham, H. C.,Yoon, C. W. Springer Science + Business Media 2014 Catalysis letters Vol.144 No.4
<P>Ni/Ce0.65Hf0.25M0.1O2-delta (Ni/CH-M, M = Tb, Sm, Nd, Pr, and La), Ni-based catalysts supported on CeO2-HfO2 materials incorporated with rare earth elements, were prepared by a solvothermal method. The resulting catalysts were found to have surface areas ranging from 41 to 47 m(2)/g, and they proved to possess strong metal-to-support interactions, as evidenced by temperature programmed reduction analyses. Upon utilization of these catalysts for dry reforming of methane (DRM) with a CH4/CO2 ratio of 1 at a range of 600 to 900 degrees C, the Ni/CH-M catalysts were found to have higher activities than the Ni/CH catalyst. In addition, the activities proved to increase in the order of Ni/CH-Pr>Ni/CH-La similar to Ni/CH-Tb>Ni/ CH-Nd similar to Ni/CH-Sm>Ni/CH. With a high CH4/CO2 ratio of 2, these Ni/CH-M materials showed better stabilities than the Ni/CH catalyst in the DRM reaction at 800 degrees C for 150 h. Moreover, the Ni/CH-M (M = Pr, Tb, and La) catalysts exhibited superior durability over other Ni materials. Consistent with the observations, transmission electron microscopy further confirmed that no carbon species were observed in the Ni/CH-M (M = Pr, Tb, and La) catalysts following the reforming reactions.</P>
Akash Sharma,Karavadi Vidusha,Harshini Suresh,Ajan M. J.,Kavinkumar Saravanan,Madhvi Dhamania,Nisha B,Rabbanie Tariq Wani 대한심장학회 2021 Korean Circulation Journal Vol.51 No.12
Background and Objectives: Knowledge about myocardial Infarction (MI) symptoms is crucial because inadequate awareness ensures direct association with patient delay and adverse health events subsequently. Methods: PRISMA guidelines were followed while conducting the systematic review with PROSPERO number CRD42020219802. An electronic search was conducted comprehensively through 5 databases to find those relevant articles systematically. Prevalence was calculated for each typical symptom of MI separately and subgroup analysis according to continent, country, gender and ethnicity was done. Meta-Analysis was conducted by using statistical software R version 3.4.3. A random-effects model was used. Results: Studies from 35 different countries with 120,988,548 individuals were included in the final analysis. The prevalence of chest pain awareness was highest, while it was lowest for jaw, back, and neck pain. There was no difference in terms of awareness in males and females. Prevalence of awareness of typical MI symptoms was higher in the Caucasian white, white, and non-Hispanic white groups than in other groups. The prevalence varies from less than 5% in African countries such as Kenya, Tanzania and Asian countries such as Nepal to as high as 90% in Germany. Conclusions: People are well aware of chest pain as a symptom of MI. However, there is limited knowledge regarding other typical symptoms of MI.
한종희,권용재,윤성필,임태훈,Dasika Harshini,남석우 한국화학공학회 2010 Korean Journal of Chemical Engineering Vol.27 No.2
We investigated the steam reforming of methane (SRM) over various NiCo bimetallic catalysts supported on ZrO2 to determine whether the addition of Co on the Ni catalyst suppressed carbon formation. The effect of metal loading on SRM reaction was evaluated in a downflow tubular fixed-bed reactor under various steam-to-carbon (S/C) ratios and temperatures. For monitoring changes in the catalysts before and after the SRM reactions, several techniques (BET, XRD, TEM, and CHN analysis) were used. The effects of reaction temperature, gas hourly space velocity (GHSV), and molar S/C ratios were studied in detail over the various catalyst combinations. It was found that an Nito-Co ratio of 50 : 50 supported on ZrO2 provided the best catalytic activity, along with an absence of coking, when operated at a temperature of 1,073 K, a GHSV of 24 L g−1 h−1, and an S/C ratio of 3 : 1.
Length of hospital stay among oral and maxillofacial patients: a retrospective study
Fo Yew Tan,Kalpana Selvaraju,Harshinie Audimulam,Zhi Chuan Yong,Tassha Hilda Adnan,Sathesh Balasundram 대한구강악안면외과학회 2021 대한구강악안면외과학회지 Vol.47 No.1
Objectives: Many conditions of the oral and maxillofacial region require hospitalization and in-patient care. The average length of stay (LOS) of these patients varies and is usually affected by multiple confounding variables. However, even with an increasing number of hospital admissions, published evidence on the factors that affect the LOS of oral and maxillofacial patients is lacking. Therefore, this study assessed the LOS of in-patients at the oral and maxillofacial surgery department of a government-funded, multi-specialty hospital in Malaysia, based on their reasons for admission and other factors. Materials and Methods: Our samples were collected retrospectively over a 5-year period and included patients with maxillofacial infections, posttrauma stabilization, facial bone fracture surgery, benign and malignant lesion surgery, dentoalveolar surgery, and other maxillofacial surgeries as reasons for admission. Factors potentially affecting LOS were also recorded, and their significance was determined using multiple logistic regression analyses. A P-value of less than 0.05 was considered to be statistically significant. Results: A total of 1,380 patients were included in this study. Most (84.5%) of our in-patients were of Malay ethnicity, and males outnumbered females in our sample by 502 subjects. The median LOS of our in-patients was 3 days. Sex, ethnicity, age, reason for admission, and American Society of Anesthesiology (ASA) classification were factors that significantly affected LOS. Conclusion: The median LOS reported in this study was 3 days. LOS was significantly affected by sex, ethnicity, age, reason of admission and ASA classification.
Effect of Ag loading on praseodymium doped ceria catalyst for soot oxidation activity
Pandurangappa Govardhan,Anjana Payyalore Anantharaman,Sunaina Shivasharanappa Patil,Hari Prasad Dasari,Harshini Dasari,Atmuri Shourya 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.2
Silver-loaded praseodymium doped ceria (XAg/PDC) was synthesized by microwave-assisted co-precipitation and wetness impregnation. XRD confirms the fluorite structure of ceria without secondary phase, and Raman spectroscopy represents the increased generation of oxygen vacancies with Ag loading. The TEM analysis shows lattice fringes corresponding to both CeO2 and Ag on the surface. The BET and BJH analysis of catalyst confirms the high porosity accompanied by high surface area and pore diameter of 5Ag/PDC and 15Ag/PDC, making it more active for the oxidation reaction. From the XPS analysis the amount of surface Ce3+ concentration and the surface chemisorbed oxygen species (O2 2) is high for 5Ag/PDC and 15Ag/PDC, in line with XRD and Raman results. The soot oxidation T50 temperature follows the trend: 5Ag/PDC~15Ag/PDC>10Ag/PDC>20Ag/PDC>0Ag/PDC. The Ag loading increased the surface reducibility of cerium ions and thus 5 wt% was optimized.