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RISS 인기검색어
- 검색키워드
- 저자 : Mandal Bikash (검색결과 6 건)
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Mandal, Bikash,Chung, Jin Suk,Kang, Sung Gu American Chemical Society 2018 JOURNAL OF PHYSICAL CHEMISTRY C - Vol.122 No.18
<P>We investigated the structural, magnetic, and electronic properties of 5,10,15,20-tetrakis(4-pyridyl)porphyrin (TPyP) metal organic frameworks (MOFs). A spin-liquid state was found in FeTPyP-Fe and CoTPyP-Co MOFs. Long-range ferromagnetism was observed in FeTPyP-Co and CoTPyP-Fe MOFs. Ferromagnetic coupling in the CoTPyP-Fe (FeTPyP-Co) MOF was attributed to through-bond spin polarization (both spin delocalization and through-bond spin polarization). Our calculations revealed CoTPyP-Fe to be a half-metal. Dirac bands in the CoTPyP-Co and FeTPyP-Co MOFs might be responsible for the high reactivity of these MOFs in oxygen evolution reactions (OERs). The highest reactivity of FeTPyP-Co among the other TPyP MOFs might be related to the many frontier Dirac bands in the conduction band of FeTPyP-Co. In addition, the hazardous gas capturing ability of the most reactive MOF, FeTPyP-Co MOF, was examined. The adsorption of all gas molecules studied was energetically favorable, and the observed adsorption energies in decreasing order were NO<SUB>2</SUB> > NO > SO<SUB>2</SUB> > CO > O<SUB>2</SUB> > PH<SUB>3</SUB> > N<SUB>2</SUB> > NH<SUB>3</SUB> > H<SUB>2</SUB>S > OCS > H<SUB>2</SUB>O > CO<SUB>2</SUB>. The highest charge transfer observed was from metal (Fe and Co) to NO<SUB>2</SUB>, which may form nitrate species by dissociating the N-O bonds of adsorbed NO<SUB>2</SUB>.</P> [FIG OMISSION]</BR>
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Lateral capacity of piles in layered soil: a simple approach
Bikash Mandal,Rana Roy,Sekhar Chandra Dutta 국제구조공학회 2012 Structural Engineering and Mechanics, An Int'l Jou Vol.44 No.5
Appropriate assessment of lateral capacity of pile foundation is known to be a complex problem involving soil-structure interaction. Having reviewed the available methods in brief, relative paucity of simple and rational technique to evaluate lateral capacity of pile in layered soil is identified. In this context, two efficient approaches for the assessment of lateral capacity of short pile embedded in bilayer cohesive deposit is developed. It is presumed that the allowable lateral capacity of short pile is generally dictated by the permissible lateral displacement within which pile-soil system may be assumed to be elastic. The applicability of the scheme, depicted through illustration, is believed to be of ample help at least for practical purpose.
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Lateral capacity of piles in layered soil: a simple approach
Mandal, Bikash,Roy, Rana,Dutta, Sekhar Chandra Techno-Press 2012 Structural Engineering and Mechanics, An Int'l Jou Vol.44 No.5
Appropriate assessment of lateral capacity of pile foundation is known to be a complex problem involving soil-structure interaction. Having reviewed the available methods in brief, relative paucity of simple and rational technique to evaluate lateral capacity of pile in layered soil is identified. In this context, two efficient approaches for the assessment of lateral capacity of short pile embedded in bi-layer cohesive deposit is developed. It is presumed that the allowable lateral capacity of short pile is generally dictated by the permissible lateral displacement within which pile-soil system may be assumed to be elastic. The applicability of the scheme, depicted through illustration, is believed to be of ample help at least for practical purpose.
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Maxwell–Wagner-type relaxation behavior through impedance spectral analysis of YMnO3 single crystal
Midya Arindam,Mandal Bikash,Patra Moumita 한국물리학회 2023 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.83 No.5
Single crystalline YMnO3 has been investigated through the temperature- dependent dielectric and conductivity analysis in between the temperature region 100 and 320 K with frequency range from 20 to 100 kHz. A distinct peak has been observed in temperature-dependent dielectric loss (tanδ) which has been shifted to higher temperature with frequency. The activation energy has been calculated as 0.44eV from peak shifting of tanδ. To explore the bulk and electrode contribution of the sample, impedance spectral analysis of the obtained dielectric data has been performed which suggests the presence of a Maxwell–Wagner-type interfacial effect in addition with intrinsic effect. It was found that the activation energy 0.44–0.46 eV obtained from the Arrhenius fit is similar to the value from the obtained parameter from the Nyquist plot.
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Influence of Ageing on the Intergranular Corrosion of an Al–Mg–Si Alloy
Aluru Praveen Sekhar,Arijit Samaddar,Ashim Bikash Mandal,Debdulal Das 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.12
This report investigates the influence of ageing on the susceptibility to intergranular corrosion (IGC) of an Al–Mg–Si alloy. The selected AA6063 Al-alloy has been exposed to ageing treatments at a predetermine temperature of 423 K for durationsof 1 to 168 h to achieve the wide range of ageing states covering under- to peak- to over-aged. The ageing behaviour of theselected alloy has been determined based on the results of hardness and tensile properties. The susceptibility to IGC has beenevaluated following the British standard (BS ISO-11846) method B and assessed based on the average and maximum corrosiondepths apart from in-depth surface and sub-surface characterizations of corroded specimens. It has been observed thatthe depths of corrosion increase monotonically with increase in ageing time. With progress of artificial ageing, the dominantmode of corrosion gradually changes in the order of minor pitting, moderate pitting, pitting plus localized IGC, localizedIGC and uniform IGC. The phenomenon of preferential dissolution of Mg from the β″ (Mg5Si6) and β (Mg2Si) precipitatesas well as the existence of Fe-rich intermetallic particles at the grain boundaries cause the pitting and intergranular corrosionbecause of the formation of local galvanic cells between the lower corrosion potential of Mg-depleted precipitates orprecipitate free zones and to the adjacent anodic grain boundary precipitates.
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Jangra Sumit,Dhall Heena,Aggarwal Shilpi,Mandal Bikash,Jain Rakesh Kumar,Ghosh Amalendu 한국응용곤충학회 2020 Journal of Asia-Pacific Entomology Vol.23 No.2
Thrips palmi is an important insect pest of vegetables and ornamental crops worldwide. Besides direct damage caused by feeding, it transmits several tospoviruses in a persistent-propagative manner. Eggs of T. palmi are microscopic and embedded within plant tissue by the sharp ovipositor of adult female. In the present study, an artificial oviposition setup has been standardized for T. palmi. Eggs of T. palmi were harvested in sterile water between two thin membranes. The developmental stages of T. palmi embryo were studied starting from oviposition up to hatching by inverted and confocal reflection microscopy. Energids were homogeneously distributed at an early stage of development. The anterior end of the egg curved with a constriction post 38 h. Initiation of tissue organization, mouthparts, appendages, compound eyes were observed at different time points. Appendages were well developed and segmentation was prominent post 70 h. The embryo was completely developed at around 80 h and hatched by 86 h post oviposition at 28 °C temperature. The study first time reports the embryonic development of T. palmi that would be helpful in detailed investigations of thrips developmental biology and evolution.
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