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Analytical study of pulsatile mixed electroosmotic and shear-driven flow in a microchannel with a slip-dependent zeta potential

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Applied Mathematics and Mechanics(English Edition) 2023年第6期44卷 1007-1022页

作者： d.banerjee S.PATI P.BISWAS department of Mathematics National Institute of Technology SilcharAssam 788010India department of Mechanical Engineering National Institute of Technology SilcharAssam 788010India

The escalation of zeta potential by the influence of wall slip for the electrokinetically modulated flow through a microchannel motivates to consider the impact of hydrodynamic slippage upon the zeta or surface *** reported study undergoes an analytical exploration of the pulsatile electroosmosis and shear-actuated flow characteristics of a fluid with a Newtonian model through a microchannel with parallel plates by invoking the reliance of a zeta or surface potential on *** linearized Poisson-Boltzmann and momentum equations are solved analytically to obtain the explicit expression of the electrical potential induced in the electrical double layer(EdL),the flow velocity field,and the volumetric flow rate for an extensive span of *** velocity field proximal to the microchannel wall is observed to enhance by an apparent zeta potential,and is further escalated for a thinner EdL and an oscillating electric field with a higher ***,near the core region of the microchannel,the flow velocity becomes invariant with the EdL *** result shows that the lower wall velocity contributes to the flow velocity along with the electroosmotic body force and the impact of the velocity of the wall underneath diminishes proximal to the upper ***,the volumetric flow rate increases when the thickness of the EdL decreases,owing to the influence of the wall ***,for thinner EdLs and medium and higher oscillating Reynolds numbers,the volumetric flow rate varies non-monotonously,correlative to the slip-free and slip cases.

关键词： apparent zeta potential electroosmotic flow Newtonian fluid pulsatile flow

X-Ray and Ultraviolet Flares on AT Microscopii Observed by AstroSat

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Research in Astronomy and Astrophysics 2023年第1期23卷 60-75页

作者： A.A.Kuznetsov R.R.Karakotov K.Chandrashekhar d.banerjee Institute of Solar-Terrestrial Physics Irkutsk664033Russia department of Geography Irkutsk State UniversityIrkutsk664033Russia Rosseland Centre for Solar Physics University of OsloPO Box 1029Blindern 0315 OsloNorway Institute of Theoretical Astrophysics University of OsloPO Box 1029Blindern 0315 OsloNorway Aryabhatta Research Institute of Observational Sciences(ARIES) Manora PeakNainital 263002India Indian Institute of Astrophysics Sarjapur Main Road2nd BlockBangaloreKarnataka 560034India Center of Excellence in Space Science IISER KolkataKolkata 741246India

We present observations of the active M-dwarf binary AT Mic(dM4.5e+dM4.5e)obtained with the orbital observatory Astro *** 20 ks of observations,in the far-ultraviolet(130-180 nm)and soft X-ray(0.3-7 keV)spectral ranges,we detected both quiescent emission and at least five flares on different components of the *** X-ray flares were typically longer than and delayed(by 5-6 minutes)with respect to their ultraviolet counterparts,in agreement with the Neupert *** X-ray spectral fits,we estimated the parameters of the emitting *** results indicate the presence of a hot multi-thermal corona with average temperatures in the range of~7-15 MK and emission measure of~(2.9-4.5)×10^(52)cm^(-3);both the temperature and the emission measure increased during the *** estimated abundance of heavy elements in the corona of AT Mic is considerably lower than at the Sun(~0.18-0.34 of the solar photospheric value);the coronal abundance increased during the flares due to chromospheric *** detected flares had the energies of~10^(31)-10^(32)erg;the energy-duration relations indicate the presence of magnetic fields stronger than in typical solar flares.

关键词： stars coronae-stars flare-stars late-type-X-rays stars ultraviolet

Multiphase flow challenges in drilling, completions, and injection:Part 2

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Petroleum 2024年第4期10卷 570-583页

作者： C.E.Obi A.R.Hasan A.Badejo M.A.Rahman d.banerjee Texas A&M University Texas A&M University Qatar

This review addresses the diverse applications of multiphase flows, focusing on drilling, completions, and injection activities in the oil and gas industry. Identifying contemporary challenges and suggesting future research directions, it comprehensively reviews evolving applications in these multidisciplinary topics. In drilling, challenges such as gas kicks, cutting transport, and hole cleaning are explored. The application of immersion cooling technology in surface facilities for gas fields utilized in integrated bitcoin mining is also discussed. Nanotechnology, particularly the use of nanoparticles and nanofluids, shows promise in mitigating particulate flow issues and controlling macroscopic fluid behavior. Nanofluids find applications in drilling for formation strengthening and mitigating formation damage in completions as highlighted in this work, as well as in subsurface injection for enhanced oil recovery(EOR), waterflooding,reservoir mapping, and sequestration tracking. The review emphasizes the need for techno-economic analyses using multiphase flow models, particularly in scenarios involving fluid injection for energy storage. Addressing these multiphase flow challenges is crucial for the future of energy diversity and transition initiatives, offering benefits such as financial stability, resilience, sustainability, and reliable supply chains. In the first part of this review, we presented the application of multiphase(typical gas,liquid, solid) flow models and technology for drilling, completion, and injection operations. This second part of this review presents the applications of multiphase particulate(nanofluid) flow technology for drilling, completion, and injection operations. It aims to identify technology development needs related to multiphase flows, enhancing research endeavors for better cognition and mitigation of the identified issues. The use of computational fluid dynamics(CFd), machine learning(ML), and system modeling for multiphase flow

关键词： Multiphase flow drilling Completion Injection Nanoparticle

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肾移植术后输尿管狭窄球囊扩张术后的移植物和病人长期生存率:23年回顾性对比研究

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国际医学放射学杂志 2016年第6期 695-696页

作者： S.Kumar J.H.Jeon A.Hakim S.Shrivastava d.banerjee U.Patel 胡伟杰 department of Radiology(U.P.) St George's University Hospitals NHS Foundation TrustUniversity of London

摘要目的研究肾移植术后发生输尿管狭窄的病人在行肾输尿管狭窄经皮输尿管成形术后的移植物和病人的长期生存率,并将结果与未发生输尿管狭窄的病人进行比较。

关键词：输尿管狭窄肾移植术后移植物病人球囊扩张术生存率回顾性

Healing property of the Piper betel phenol, allylpyrocatechol against indomethacin-induced stomach ulceration and mechanism of action

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World Journal of Gastroenterology 2007年第27期13卷 3705-3713页

作者： S Bhattacharya d.banerjee AK Bauri S Chattopadhyay SK Bandyopadhyay department of Biochemistry Dr. B.C. Roy Post Graduate Institute of Basic Medical Sciences IPGME&R 244B Acharya Jagadish Chandra Bose Road Kolkata-700020 India Bio-Organic division Bhabha Atomic Research Centre Mumbai-400085 India

AIM：To evaluate the protective activity of allylpyrocatechol （APC）, the major antioxidant constituent of Piper betel, against the indomethacin-induced stomach ulceration in the rat model and correlates with its antioxidative and mucin protecting properties.METHOdS： Male Sprague-dawley rats were divided into five groups. Normal control rats （group Ⅰ ） were given the vehicle oral dose of gum acacia in distilled water （1 mL per rat）; ulcerated control and treated rats （groups Ⅱ-V） were given a single dose of indomethacin （30 mg/kg body wt.）; group Ⅱ rats were sacrificed 4 h after indomethacin administration; groups Ⅲ-Ⅴ rats were given the vehicle （1 mL per rat） or APC （2 mg/kg body wt.） or misoprostol （1.43 μg/kg body wt.） once daily by oral intubation for 7 d starting from 4 h after the indomethacin administration. After 7 d, the stomach tissues were excised for histological examination and biochemical analysis. RESULTS： Treatment with APC （2 mg/kg body wt per day） and misoprostol （1.43 μg/kg body wt per day） for 7 d could effectively heal the stomach ulceration as revealed from the ulcer index and histopathological studies. Compared to the zero day ulcerated group, treatment with APC and misoprostol reduced the ulcer index by 93.4% and 85.4% respectively （P 〈 0.05）. Both APC and misoprostol accelerated ulcer healing observed in natural recovery （P 〈 0.05）, their respective healing capacities not being significantly different. The healing capacities of APC and misoprostol could be attributed to their antioxidant activity as well as the ability to enhance the rnucin content of the gastric tissues. Compared to the ulcerated untreated rats, those treated with APC and rnisoprostol showed near normal MdA levels, while the protein levels were 86% and 78% of the normal value respectively （P 〈 0.05）. Likewise, both APC and rnisoprostol increased the SOd, catalase, and rnucin levels significantly （P 〈 0.05）, the effect of APC being better. CONCLUSION： APC can protect ind

关键词： Allylpyrocatechol Antioxidant Histopathology Indornethacin Mucin Piper betel Stomach ulcer

Molecular level biodegradation of phenol and its derivatives through dmp operon of Pseudomonas putida:A bio-molecular modeling and docking analysis

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Journal of Environmental Sciences 2015年第10期27卷 144-151页

作者： Sujay Ray Arundhati banerjee department of Biochemistry and Biophysics University of Kalyani department of Biotechnology Bengal College of Engineering and TechnologyShahid Sukumar SaraniBidhannagarDurgapur-713212West BengalIndia department of Biotechnology National Institute of Technology

Participation of Pseudomonas putida-derived methyl phenol（dmp） operon and dmp R protein in the biodegradation of phenol or other harmful, organic, toxic pollutants was investigated at a molecular level. documentation documents that P. putida has dmp R protein which positively regulates dmp operon in the presence of inducers; like phenols. From the operon,phenol hydroxylase encoded by dmp N gene, participates in degrading phenols after dmp operon is expressed. For the purpose, the 3-d models of the four domains from dmp R protein and of the dNA sequences from the two Upstream Activation Sequences（UAS）present at the promoter region of the operon were demonstrated using discrete molecular modeling techniques. The best modeled structures satisfying their stereo-chemical properties were selected in each of the cases. To stabilize the individual structures, energy optimization was performed. In the presence of inducers, probable interactions among domains and then the two independent dNA structures with the fourth domain were perused by manifold molecular docking simulations. The complex structures were made to be stable by minimizing their overall energy. Responsible amino acid residues, nucleotide bases and binding patterns for the biodegradation, were examined. In the presence of the inducers, the biodegradation process is initiated by the interaction of phe50 from the first protein domain with the inducers. Only after the interaction of the last domain with the dNA sequences individually, the operon is expressed. This novel residue level study is paramount for initiating transcription in the operon; thereby leading to expression of phenol hydroxylase followed by phenol biodegradation.

关键词： Biodegradation dmp operon docking simulations Modeling Phenol P.putida

Fundamentals,recent developments and prospects of lithium and non-lithium electrochemical rechargeable battery systems

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Journal of Energy Chemistry 2023年第6期81卷 221-259,I0007页

作者： Maitri Patel Kuldeep Mishra Ranjita banerjee Jigar Chaudhari d.K.Kanchan deepak Kumar Gujarat Technological University AhmedabadGujarat 382424India Electronics and Mechanical Engineering School VadodaraGujarat 390008India department of Physics Jaypee UniversityAnoopshahrUttar Pradesh 203390India C.K.Shah Viapurwala Institute of Management VadodaraGujarat 390001India Vishwakarma Government Engineering College AhmedabadGujarat 382424India ITM(SLS) Baroda UniversityPaldiVadodaraGujarat 391510India

The present and future energy requirements of mankind can be fulfilled with sustained research and development efforts by global *** purpose of this review paper is to provide an overview of the fundamentals,recent advancements on Lithium and non-Lithium electrochemical rechargeable battery systems,and their future *** initial part of this review paper is dedicated to the advancement and challenges faced by the conventional rechargeable batteries,such as lead-acid,Ni-Cd and Ni-MH *** subsequent section of this review focuses on an in-depth analysis of two major categories of rechargeable batteries,namely lithium-based rechargeable battery systems and alternative non-Lithium rechargeable battery *** working principle,construction,and a few important research progress on Li-ion,Li-O_(2),Li-CO_(2) and Li-S batteries have been *** recent progress and challenges of the alternate batteries such as Na-ion,Na-S,Mg-ion,K-ion,Al-ion,Al-air,Zn-ion and Zn-air are also discussed in this *** large gap between theoretical and practical electrochemical values for the alternate battery system must be filled by adopting a series of design architectures followed by modern instrumentation for developing next-generation batteries in a sustainable and efficient way.

关键词： Conventional rechargeable batteries Li-ion batteries Li-S batteries Li-air battery Other than Lithium batteries Alternate battery systems

Plant Remains from an Archaeological Site as Indicators of Vegetation and Agricultural Practice Between(3 320±400) and(2 080±80) yr BP in Gangetic West Bengal,India

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Journal of Integrative Plant Biology 2006年第6期48卷 628-641页

作者： Ruby Ghosh Subir Bera Ashalata d'Rozario Manju banerjee Supriyo Chakraborty department of Botany University of Calcutta 35 Ballygunge Circular RoadKolkata 700019India Narasinha dutt College 129 Bellilious Road Howrah 711101India Radiocarbon dating Laboratory Birbal Sahni Institute of Palaeobotany 53 University RoadLucknow 226007India

diverse plant remains recovered from an archaeological site of Chslcollthlc-Early Historic age in the Bhalrabdanga area of Pakhanna （latitude 23°25′N, longitude 87°23′E）, situated on the west bank of the damodar river, Bankura district, West Bengal, India, include food grains, wood charcoals, and palynomorphs. Radiocarbon dating of the recovered biological remains reveal the age of the site as （3 320 ± 400） to （2 080± 80） yr BP. The food grains were Identified as Oryza sativa L. and Vigna mungo L, and seeds of Brassica cf. campestris L. were also found; these indicate the agricultural practice and food habits of the ancient people living at Pakhanna from the Chalcolithlc to the Early Historic period. Sediments Including plant remains have been broadly divided into two zones, considering archaeological findings and radiocarbon dating. Analysis of the plant remains （I.e, wood charcoals and palynomorphs） in addition to cultivated food grains has revealed that a rich vegetation cover existed in this area, with a prevailing tropical and humid climate, comprising the timber-yielding plants Shores sp., Terminalia sp., and Tamarindus sp., with undergrowths of diverse shrubs and herbs during the Chalcolithic period （zone I） dated （3 320 ± 400） yr BP. Comparatively poorer representation and frequency of plant remains Indicate a drier climate during the Early Historic period （zone Ⅱ） dated as （2 110 ± 340） to （2 080 ± 80） yr BP. Comparisons of the archaeobotanical data recovered from the Chalcollthic and Early Historic period and also a principle components analysis Indicate a change In the climate of the area from tropical and humid at （3 320 ± 400） yr BP to tropical and drier conditions at （2 110 ± 340） to （2 080 ± 80） yr BP. The present-day tropical, dry deciduous vegetation of the area suggests that climate change has occurred in the area since the contemporaneous past. The plant remains database has been utilized to reconstruct the settlement pattern of the community livi

关键词： agriculture archaeological site culture, India Pakhanna, plant remains vegetation West Bengal.

A New Report of Serpentinites from Northern Central Indian Ridge(at 6°S)—An Implication for Hydrothermal Activity

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Acta Geologica Sinica(English Edition) 2008年第6期82卷 1213-1222页

作者： dwijesh RAY Ranadip banerjee Sridhar d.IYER Subir MUKHOPAdHYAY Geological Oceanography division National Institute of OceanographyGoa 403004India department of Geological Sciences Jadavpur UniversityKolkata 700 032India

Serpentinites from the inside corner high （6°38.5′S/68°19.34′E） from the Northern Central Indian Ridge （NCIR） are comprised mainly of high Mg-rich lizardite and chrysotile pseudomorphs with varying morphologies. ＇Mesh rim＇, ＇window＇, ＇hourglass＇ and ＇bastite＇ are the most common textures displayed by both chrysotile and lizardite. Numerous chrysotile veins in association with cross cutting magnetite veins indicate an advanced stage of serpentinisation. The relatively high abundance of chrysotile and lizardite suggest their close association and formation at a temperature below 250℃. Abundant ＇mesh rim＇ and ＇bastite＇ texture and variegated matrix reveal that the present serpentinites might have formed due to the interaction of harzburgite and seawater. Positive Eu anomaly （Eu/Eu^＊ up to ＋3.38）, higher La/Sm （up to 4.40） and Nb/La （up to 6.34） ratios suggest substantial hydrothermal influence during the formation of the serpentinites.

关键词： serpentinite serpentinisation hydrothermal alteration