Sulfur-Modified Graphitic Carbon Nitride Nanostructures for Robust Oxygen Evolution Reaction Electrocatalyst

( Vinayak ),현택환 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0

There is a critical need to develop low cost, metal-free, highly efficient and durable catalysts for industrially important oxygen evolution reactions. Inspired by natural geodes, unique melamine nanogeodes are successfully synthesized using well established hydrothermal process. Sulfur-modified graphitic carbon nitride (S-modified g-CNx) electrocatalysts are obtained by annealing these melamine nanogeodes in situ with sulfur. As compared to the previously reported non-metallic systems and well-established metallic catalysts, the S-modified g-CNx nanostructures achieved superior performance, requiring a lower overpotential (290 mV) to achieve a current density of 10 mA cm-2 and a Tafel slope of 120 mV dec-1 with long-term durability of 91.2% retention for 18 h. These low-cost, ecologically friendly, and easy-tosynthesize catalysts with unusual performance will have a great influence in the field of oxygen evolution reaction electrocatalysis.

Management of apicomarginal defect in esthetic region associated with a tooth with anomalies

Vinayak Venkoosa Meharwade,Dipali Yogesh Shah,Pradyna Prabhakar Mali,Vidya Vinayak Meharwade 대한치과보존학회 2015 Restorative Dentistry & Endodontics Vol.40 No.4

Tooth related factors such as palatoradicular groove can be one of the causes for localized periodontal destruction. Such pathological process may result in apicomarginal defect along with inflammation of pulp. This creates challenging situation which clinician must be capable of performing advanced periodontal regenerative procedures for the successful management. This case report discusses clinical management of apicomarginal defect associated with extensive periradicular destruction in a maxillary lateral incisor, along with histopathologic aspect of the lesion.

Management of apicomarginal defect in esthetic region associated with a tooth with anomalies

Meharwade, Vinayak Venkoosa,Shah, Dipali Yogesh,Mali, Pradyna Prabhakar,Meharwade, Vidya Vinayak The Korean Academy of Conservative Dentistry 2015 Restorative Dentistry & Endodontics Vol.40 No.4

Tooth related factors such as palatoradicular groove can be one of the causes for localized periodontal destruction. Such pathological process may result in apicomarginal defect along with inflammation of pulp. This creates challenging situation which clinician must be capable of performing advanced periodontal regenerative procedures for the successful management. This case report discusses clinical management of apicomarginal defect associated with extensive periradicular destruction in a maxillary lateral incisor, along with histopathologic aspect of the lesion.

제국주의 시대의 항쟁을 기리며

비나약 차투르베디(Vinayak Chaturvedi) 부산대학교 한국민족문화연구소 2009 로컬리티 인문학 Vol.0 No.2

본 논문에서는 사바르카르(Vinayak Damodar Savarkar)가 혁명적 독립 항쟁이라는 개념을 형성하는 과정에서 영향을 받은 주요한 방법론적, 역사적 요인들에 초점을 맞추고 또한, 민족주의와 세계화의 담론틀 내에서 사바르카르가 ‘학명’과 ‘독립’을 어떻게 해석하고 있는지도 검토하였다. 『1857년 인도독립 항쟁』(The Indian War of Independence of 1857)에서 사바르카르는, 민족주의적 관점에서 역사를 집필하기 위해 식민주의자들의 문헌에 대해 ‘결을 거슬러 읽었다’고 할 수 있을 것이다. 미세하고 사소한 자료, 구술 자료(oral source)의 복권을 시도하고 마찌니가 기술한 혁명사 서술이라는 방법론적 접근을 도입하는 등 민족사를 기술하는 데 필요한 다양한 방법론의 연구에 관심을 가졌다. 이것은 ‘편파적’이고 ‘영국 중심의’(foreign) 역사가들이 지배하던 문헌 자료를 바로잡는 데에 필수적인 접근법이었다. 사바르카르는 역사를 기술하는 작업을 통해서 사회를 변화시키고자 하는 직접적인 행동과 민족의식을 만들어 내는 과정에 참여할 수 있다고 믿었다. 『1857년 인도 독립 항쟁』은 제국에 대항하는 봉기를 일으키고자 했고, 이를 위해 혁명 정신을 고취시키고자 하는 의도로 집필되었지만, 동시에 민족주의적 관점에서 역시를 기술하기 위한 것이기도 했다. This essay considers some of the key methodological and historical influences on Savarkar's conceptualization of a revolutionary war of independence. It will also examine Savarkar's interpretations of 'revolution' and 'independence' within national and global debates on the history of ideas. We can say in The Indian War of Independence of 1857, Savarkar was 'read against current' the colonial historiography in order to write his own national history. Savarkar attempted rehabilitation of micro/trivial data or oral sources and interested in methodology that necessary to describe national history, so introduced to his writing the Mazzini's revolutionary historical methods also. This is necessary approach to correct partial and anglo-centric history writing or literal data which was overwhelming that time. The Indian War of Independence of 1857, was meant to inspire a revolutionary spirit in all Indians for the purpose of taking up arms against the empire, but also for the purpose of writing nationalist histories.

Improved Performance of Inkjet Printed Perovskite Solar Cells by Spray Deposited SnO₂ Electron Transport Layer

Vinayak Satale,강재욱 한국고분자학회 2023 한국고분자학회 학술대회 연구논문 초록집 Vol.48 No.1

[원문] Remembering Warfare in the Age of Empire

Vinayak Chaturvedi 부산대학교 한국민족문화연구소 2009 로컬리티 인문학 Vol.0 No.2

Peace

Vinayak Krishna Gokak 한인문화연구원 1990 한인문화논총 Vol.7ㆍ8 No.-

Differential Osmotic Adjustment to Iso-osmotic NaCl and PEG Stress in the in vitro Cultures of Sesuvium portulacastrum (L.) L.

Vinayak Haribhau Lokhande,Tukaram Dayaram Nikam,Suprasanna Penna 한국작물학회 2010 Journal of crop science and biotechnology Vol.13 No.4

The influence of iso-osmotic (-0.7 MPa) NaCl and PEG stress on growth, osmotic adjustment and antioxidant defense mechanisms was investigated in the in vitro cultures of Sesuvium portulacastrum (L.) L. The decreased relative growth rate (RGR) and water content of PEG-stressed calli in comparison to NaCl was found to be correlated with differences observed in the energy expenditure for the maintenance of osmotic balance. Osmotic adjustment in the NaCl-stressed calli favored higher accumulation of saline ions and soluble sugars, whereas PEG-stressed calli confirmed increased levels of organic osmolytes (proline, glycine betaine and soluble sugars). Permeability of Na+ ions across the membrane revealed increased relative electrolytic leakage (REL) in NaCl-stressed calli,however non-penetrating and highly viscous solution of PEG amplified the peroxidation of membrane lipids. Increased activities of superoxide dismutase and catalase displayed efficient removal of toxic reactive oxygen species in comparison to ascorbate peroxidase in the calli exposed to iso-osmotic stress. These findings suggest that differential tolerance potential to iso-osmotic NaCl and PEG stress in terms of osmotic adjustment appears to be the prime defense mechanism of Sesuvium for its survival under iso-osmotic stress conditions at the expense of reduced growth and water content.

A Review on Working Pair Used in Adsorption Cooling System

Vinayak D. Ugale,Amol D. Pitale 대한설비공학회 2015 International Journal Of Air-Conditioning and Refr Vol.23 No.2

Adsorption cooling system find its application in refrigeration, air conditioning, chiller, Ice making, etc. It uses thermal energy as driving force. Adsorption systems are environmental friendly (zero global warming potential and ozone depleting potential) and also eliminates use of compressor and minimize vibration problem. So it can be used as substitute for conventional vapor compression refrigeration system or vapor absorption system. The adsorption generally classified in two types as physical adsorption (due to weak van der waal forces) and chemical adsorption (chemical reaction between adsorbent and adsorbate form new molecules). The working pair of adsorber and adsorbate play vital role in the performance of adsorption system. Activated carbon, zeolite, silica gel are commonly used adsorber and water, ammonia, methanol and ethanol can be used as adsorbate. The poor heat and mass transfer performance of adsorption is major challenge for researchers. The heat transfer performance of adsorption system can be increased by increasing heat transfer area of adsorber bed i.e., design of new adsorber bed, while mass transfer performance is improved by use of new adsorbent with higher sorption rate. Composite adsorber solve the problem of heat and mass transfer performance of chemical adsorbents and adsorption quantity of physical adsorbents by combination of chemical and physical adsorbent but it can add some limitation with it. In this paper, various adsorption pair, their selection, design of adsorber bed, methods to improve thermal performance of adsorber bed is reviewed with their properties, advantages and limitations.

Dielectric Properties of P3BT Doped ZrY2O3/CoZrY2O3 Nanostructures for Low Cost Optoelectronics Applications

Vinayak Adimule,Basappa C. Yallur,Debdas Bhowmik,Adarsha H. J. Gowda 한국전기전자재료학회 2022 Transactions on Electrical and Electronic Material Vol.23 No.3

In the present research work, low cost, high corrosion resistance, light weight fi lms of ZrY 2 O 3 /CoZrY 2 O 3 nanostructures (NS) (1:1 molar ratio) doped with P3BT (poly-3-butyl thiophene) (3 wt%, 5 wt% and 8 wt%) were synthesized by precipitation method and characterized by scanning electron microscopy (SEM), SEM–EDX, UV–visible, X-ray photoelectron spectroscopy (XPS), Fourier infrared spectroscopy (FT-IR), X-ray diffraction (XRD) spectroscopic analysis. The fabricated nanostructures studied for their dielectric and optoelectronic properties. XRD diff raction pattern indicated mixed cubic and hexagonal structure of the material and FT-IR spectra showed shift in the peak position to higher wavenumber with the increased addition of P3BT to the NS. Chemical composition analysis showed binding energies of P3BT: ZrY 2 O 3 /CoZrY 2 O 3 NS with peak centred at 162.2 eV, 156.6 eV, 182.7 eV, 180.4 eV, 794.6 eV and 778.9 eV corresponds to Y 3 d 3/2 , Y 3 d 5/2 , Zr 3 d 3/2 , Zr 3 d 5/2 , Co 2 p 3/2 and Co 2 p 5/2 respectively. Dielectric properties for 8 wt% P3BT doped NS indicated the increase of dielectric constant (9.7) with dielectric loss of 0.018 for 250 nm thickness of the NS. Electrical conductivity as 45.8%, 47.1% and 52.4% with the increase content of P3BT: ZrY 2 O 3 /ZrCoY 2 O 3 NS to 8 wt%. Optical characteristics results showed that absorption has been increased to 48% and energy gap decreased to 12.5%, charge mobility of 2056 cm 2 /V/S with ~ 10 kΩ/cm 2 sheet resistance with 90% of optical transmittance. The NS can be used to fabricate the electronic devices like light emitting diodes, field effect transistors, photovoltaic cells and have prominent applications in photonic and electronic industries.