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Journal of semiconductors 2014年第12期35卷 32-37页

作者： s.chakraborty N.B.Manik Condensed Matter Physics Research Center Department of Physics Jadavpur University

We report the effect of COOH-functionalized single walled carbon nanotubes（COOH-sWCNT） on the electrical and photovoltaic characteristics of Malachite Green（MG） dye based photovoltaic cells. Two different types of photovoltaic cells were prepared, one with MG dye and another by incorporating COOH-sWCNT with this dye. Cells were characterized through different electrical and photovoltaic measurements including photocurrent measurements with pulsed radiation. From the dark current–voltage（I–V） characteristic results, we observed a certain transition voltage（Vth/ for both the cells beyond which the conduction mechanism of the cells change sharply. For the MG dye, Vthis 3.9 V whereas for COOH-sWCNT mixed with this dye, Vthdrops to 2.7 V. The device performance improves due to the incorporation of COOH-sWCNT. The open circuit voltage and short circuit current density change from 4.2 to 97 m V and from 108 to 965 A/cm2 respectively. Observations from photocurrent measurements show that the rate of growth and decay of the photocurrent are quite faster in the presence of COOH-sWCNT. This observation indicates a faster charge separation processes due to the incorporation of COOHsWCNT in the MG dye cells. The high aspect ratio of COOH-sWCNT allows efficient conduction pathways for the generated charge carriers.

关键词： MG dye COOH-sWCNT photovoltaic devices charge transport

Entropy analysis of unsteady magneto-nanofluid flow past accelerating stretching sheet with convective boundary condition

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Applied Mathematics and Mechanics(English Edition) 2015年第12期36卷 1593-1610页

作者： s.DAs s.chakraborty R.N.JANA O.D.MAKINDE Department of Mathematics University of Gour Banga Department of Applied Mathematics Vidyasagar University Faculty of Military science Stellenbosch University

The unsteady laminar magnetohydrodynamics （MHD） boundary layer flow and heat transfer of nanofluids over an accelerating convectively heated stretching sheet are numerically studied in the presence of a transverse magnetic field with heat source/sink The unsteady governing equations are solved by a shooting method with the Runge-Kutta- Fehlberg scheme. Three different types of water based nanofluids, containing copper, aluminium oxide, and titanium dioxide, are taken into consideration. The effects of the pertinent parameters on the fluid velocity, the temperature, the entropy generation num- ber, the Bejan number, the shear stress, and the heat transfer rate at the sheet surface are graphically and quantitatively discussed in detail. A comparison of the entropy generation due to the heat transfer and the fluid friction is made with the help of the Bejan number. It is observed that the presence of the metallic nanoparticles creates more entropy in the nanofluid flow than in the regular fluid flow.

关键词： unsteady MHD flow nanofluid heat source/sink entropy generation Bejan number

Effect of single walled carbon nanotubes on series resistance of Rose Bengal and Methyl Red dye-based organic photovoltaic device

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Journal of semiconductors 2018年第9期39卷 15-21页

作者： K.chakraborty s.chakraborty N.B.Manik Condensed Matter Physics Research Centre Department of Physics Jadavpur University

The influence of single walled carbon nanotube（sWCNT）on the series resistanceof Rose Bengal（RB）and Methyl Red（MR）dye-based organic diodes has been *** has been revealed from experimental results that sWCNT has a significant effect on *** values of Rs are measured from current–voltage（I–V）characteristics and also by utilizing the Cheung *** values from the Cheung method have been verified using H（I）–I plots for all dye-based *** extracted values using these two processes show a good consistency with each *** is observed that Rs is reduced significantly by incorporating sWCNT for both *** estimated amounts of reduction of Rs using sWCNT are 76.08%and 64.23%obtained from the I–V relationship whereas the value of Rs shows a reduction of 83.5%and 67.1%when measured by using the Cheung method for RB and MR dyes *** ideality factor and barrier height of the diodes have also been *** ideality factor has decreased with incorporation of sWCNT.A reduction in barrier height for the devices has also been observed in the presence of sWCNT.

关键词： sWCNT series resistance OPV barrier potential ideality factor

Revisiting band structures in^(118)Xe nucleus via in-beamγ-ray spectroscopy

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Chinese Physics C 2023年第8期47卷 22-38页

作者： A.Pandey R.Bhushan A.Rohilla C.Majumder H.P.sharma s.chakraborty R.P.singh s.Muralithar Yashraj K.Katre B.Rohila subodh A.Kumar I.M.Govil s.Jehangir N.Rather G.H.Bhati A.A.Wani J.A.sheikh s.K.Chamoli Department of Physics and Astrophysics University of DelhiNew Delhi-110007India Institute of space sciences Shandong UniversityWeihai-264209China Department of Physics Indian Institute of Technology BombayMumbai-400076India Department of Physics Institute of ScienceBanaras Hindu UniversityVaranasi-221005India Variable Energy Cyclotron Centre Kolkata-700064India Inter University Accelerator Centre Aruna Asaf Ali MargNew Delhi-110067India Department of Physics Punjab UniversityChandigarh-160014India Department of Physics Islamic University of Science and TechnologyJammu and Kashmir-192122India Higher Education Department Government of Jammu and KashmirSrinagarJ&K-180001India Department of Physics University of KashmirSrinagar-190006India

The neutron deficient Xe nuclei with A≈120 are predicted to have strong octupole correlation at low *** the present study,an attempt was made to improve upon the level scheme and also to examine the signatures of octupole correlation in^(118)xe via high spin γ-ray *** spin states in^(118)Xe have been populated via the^(93)Nb(^(28)si,p2n)^(118)Xe fusion-evaporation reaction at a beam energy of 115 MeV provided by the 15 UD pelletron accelerator facility at IUAC,New *** the experiment,seven newγ-transitions have been found and placed appropriately in the level scheme.A theoretical study using the triaxial projected shell model(TPsM)approach suggests that the first bandcrossing is due to the alignment of two neutrons,and a parallel band tracking the yrast configuration is the γ-band built on the two-quasiparticle *** E1 transition rates measured between opposite parity bands involving vh_(11/2)and vd_(5/2)orbitals having△j=△l=3 indicate the presence of octupole correlation in this nucleus.

关键词： octupole correlation γ-ray spectroscopy TPsM calculations bandcrossing

通过炭黑表面改性增强橡胶-填料相互作用的新方法

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炭黑工业 2004年第4期 21-24页

作者： s.chakraborty 朱永康

炭黑以其具有提高橡胶的动态力学性能的独特能力而著称。炭黑的这种能力称之为“补强”。补强引起定伸应力增大，应力软化增加，滞后性能和生热性能提高。这也导致破坏性能如拉伸强度、撕裂强度和耐磨性的改善。除了仅与悬浮颗粒物有关... 详细信息

炭黑以其具有提高橡胶的动态力学性能的独特能力而著称。炭黑的这种能力称之为“补强”。补强引起定伸应力增大，应力软化增加，滞后性能和生热性能提高。这也导致破坏性能如拉伸强度、撕裂强度和耐磨性的改善。除了仅与悬浮颗粒物有关的粘性作用外，补强填料可以增大高拉伸时的定伸应力。由于Mullins效应。

关键词：炭黑表面改性橡胶-填料补强多羟基苯流变性能热力学性能化学键合

鞘内注射含钆对比剂的安全性:系统性评价和Meta分析

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国际医学放射学杂志 2020年第6期 738-739页

作者：董力宁 M.Patel A.Atyani J.P.salameh M.McInnes s.chakraborty Department of Medical Imaging Division of Neuroradiology University of Ottawa Ottawa Hospital Research Institute

摘要由于对鞘内注射含钆对比剂(GBCA)作用与剂量相关不良事件之间的关系缺乏了解,采用GBCA进行MR脑池成像的应用受限。目的进行系统性回顾以了解鞘内GBCA

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Understanding activity of butyrate at a cellular level

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Neural Regeneration Research 2025年第8期20卷 2323-2324页

作者： Prapti chakraborty Angela s.Laird Macquarie University Motor Neuron Disease Research Centre Macquarie Medical SchoolFaculty of MedicineHealth and Human SciencesMacquarie UniversitySydneyAustralia

Butyrate is a short-chain fatty acid of four carbons in length that is a by-product produced by the microbial fermentation of dietary fiber and undigested carbohydrates within the *** the years,butyrate has attracted ... 详细信息

关键词： carbons butyrate fiber

Revisiting cerebral endothelial cells in Alzheimer’s disease

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Neural Regeneration Research 2025年第10期20卷 2911-2912页

作者： Amira s.Hanafy Department of Neurosurgery University Hospital BonnBonnGermany

Alzheimer’s disease(AD)is the most common neurodegenerative disorder characterized by slow and progressive decline of cognitive and memory *** only approximately 5%of the cases,AD is familial,as often predisposed by genetic mutations(Hoogmartens et al.,2021),while sporadic AD accounts for approximately 95%of the *** amyloid cascade hypothesis is one of the fundamental hypotheses put out to explain AD pathogenesis as dysregulated homeostasis of amyloid-β(Aβ)peptides that leads to the accumulation of Aβplaques in the parenchyma,an anatomical hallmark of AD.

关键词： Alzheimer Aβ cerebral

Flavor-alignment in an s_(3)-symmetric Higgs sector and its RG-behavior

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Chinese Physics C 2022年第12期46卷 58-67页

作者： Nabarun Chakrabarty Indrani chakraborty Department of Physics Indian Institute of TechnologyKanpur 208016India

A three Higgs-doublet model exhibiting s_(3)-symmetry can predict the observed pattern of quark masses and their mixings. However, the same symmetry also introduces potential flavor-changing neutral currents(FCNCs)at the tree level. In this study, we assume that the scalar potential contains appropriate soft s_(3)-breaking terms to maintain flexible choices of scalar masses. We identify the parameters in the Yukawa Lagrangian of the quark sector responsible for such FCNCs and constrain them using data from flavor physics observables, such as meson-decays and meson-mixings. We also validate the corresponding model parameter space via renormalization group evaluation.

关键词： beyond the standard model extended Higgs sector flavor changing neutral current

Emerging structures and dynamic mechanisms ofγ-secretase for Alzheimer’s disease

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Neural Regeneration Research 2025年第1期20卷 174-180页

作者： Yinglong Miao Michael s.Wolfe Computational Medicine Program and Department of Pharmacology University of North Carolina–Chapel HillChapel HillNCUSA Department of Medicinal Chemistry University of KansasLawrenceKSUSA

γ-secretase,called“the proteasome of the membrane,”is a membrane-embedded protease complex that cleaves 150+peptide substrates with central roles in biology and medicine,including amyloid precursor protein and the Notch family of cell-surface *** inγ-secretase and amyloid precursor protein lead to early-onset familial Alzheimer’s disease.γ-secretase has thus served as a critical drug target for treating familial Alzheimer’s disease and the more common late-onset Alzheimer’s disease as ***,critical gaps remain in understanding the mechanisms of processive proteolysis of substrates,the effects of familial Alzheimer’s disease mutations,and allosteric modulation of substrate cleavage byγ-*** this review,we focus on recent studies of structural dynamic mechanisms ofγ-*** mechanisms,including the“Fit-stay-Trim,”“sliding-Unwinding,”and“Tilting-Unwinding,”have been proposed for substrate proteolysis of amyloid precursor protein byγ-secretase based on all-atom molecular dynamics *** an incorrect registry of the Notch1 substrate was identified in the cryo-electron microscopy structure of Notch1-boundγ-secretase,molecular dynamics simulations on a resolved model of Notch1-boundγ-secretase that was reconstructed using the amyloid precursor protein-boundγ-secretase as a template successfully capturedγ-secretase activation for proper cleavages of both wildtype and mutant Notch,being consistent with biochemical experimental *** approach could be potentially applied to decipher the processing mechanisms of various substrates byγ-*** addition,controversy over the effects of familial Alzheimer’s disease mutations,particularly the issue of whether they stabilize or destabilizeγ-secretase-substrate complexes,is ***,an outlook is provided for future studies ofγ-secretase,including pathways of substrate binding and product release,effects of modulators on familial Alzheimer’s disease mutations

关键词： Alzheimer’s disease amyloid precursor protein cryo-EM structures drug design intramembrane proteolysis molecular dynamics Notch