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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

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

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中国物理C:英文版 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

An Autopsy and Histopathology-based study to Ascertain the Cause of Death of Brought Dead Cases

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Journal of Forensic science and Medicine 2024年第1期10卷 28-33页

作者： Chandan Bandyopadhyay Prabir Chandra Paul Prabhas Chandra chakraborty Department of Forensic and state Medicine Medical CollegeKolkataWest BengalIndia Department of Pathology Jagannath Gupta Institute of Medical Science and HospitalKolkataWest BengalIndia Department of Forensic Medicine and Toxicology NRS Medical College and HospitalKolkataand M.G.M Medical College and L S.K HospitalKishanganjBiharIndia

Background and Objectives:The cases of apparent natural deaths are encountered in the hospital casualties who are noted dead at the time of the first medical attention and as such are labeled as“Brought Dead.”These include the cases of sudden death,unexplained death,and unattended *** cause of such deaths is reported in the literature to emanate principally from the cardiovascular system,though there are some documented geographical,racial,and other *** the present study,we endeavored to detect the cause of such natural deaths in terms of the disease and the organ system involved,in the deceased individuals of the contemporary Bengali population,with cases due to obvious unnatural causes being *** and Methods:An observational,cross-sectional study with 105(n=105,male:89,female:16)study subjects of age group of 20-80 years,selected by systemic random sampling,from the brought dead subjects coming to the mortuary of the NRs Medical College and Hospital for medicolegal autopsy from April 2011 to March 2012,excluding cases having a history of the obvious unnatural *** system-wise gross examination was done,followed by tissue sampling for histopathological *** case-wise findings were tabulated and analyzed for descriptive statistics using sPss ***:In the present study,89 cases were male(84.8%)and 16 cases were female(15.2%),which reflects a male:female ratio of 5.56:*** dead bodies are mostly recovered from the footpaths(47 cases,44%).sixty-four(61%)cases are of known *** 54 cases out of 105(51.4%),morbid pathology is detected in the respiratory system(Rs),lobar pneumonia,and cavitary pulmonary tuberculosis being the most frequent disease entity,in both ***-one years-sixty-five years is found to be the most commonly affected age group,in both *** and Conclusions:The present study shows that the most common organ system involved in brought dead cases is the Rs,which is s

关键词： Autopsy brought dead cause of death histopathology

孔隙率对矩形沟槽上垂直多孔屏障的波浪散射效应影响

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哈尔滨工程大学学报（英文版） 2024年第1期23卷 85-100页

作者： Gour Das Rumpa chakraborty Department of Mathematics Jadavpur UniversityKolkata-700032India Department of Mathematics Diamond Harbour Women’s UniversitySouth 24 Parganas-743368India

The effect of porosity on surface wave scattering by a vertical porous barrier over a rectangular trench is studied here under the assumption of linearized theory of water *** fluid region is divided into four subregions depending on the position of the barrier and the *** the Havelock’s expansion of water wave potential in different regions along with suitable matching conditions at the interface of different regions,the problem is formulated in terms of three integral *** the edge conditions at the submerged end of the barrier and at the edges of the trench,these integral equations are solved using multi-term Galerkin approximation technique taking orthogonal Chebyshev’s polynomials and ultra-spherical Gegenbauer polynomial as its basis function and also simple polynomial as basis *** the solutions of the integral equations,the reflection coefficient,transmission coefficient,energy dissipation coefficient and horizontal wave force are determined and depicted *** was observed that the rate of convergence of the Galerkin method in computing the reflection coefficient,considering special functions as basis function is more than the simple polynomial as basis *** change of porous parameter of the barrier and variation of trench width and height significantly contribute to the change in the scattering coefficients and the hydrodynamic *** present results are likely to play a crucial role in the analysis of surface wave propagation in oceans involving porous barrier over submarine trench.

关键词： Water wave scattering Rectangular trench Vertical porous barriers Havelock’s inversion formula Multi-term galerkin approximation Reflection and transmission coefficients Energy dissipation Hydrodynamic force

Detection and clearance in Alzheimer’s disease: leading with illusive chemical, structural and morphological features of the targets

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Neural Regeneration Research 2024年第3期19卷 497-498页

作者： Luís Gales i3s−Instituto de Investigação e Inovação em saúde Rua Alfredo AllenPortoPortugal(Gales L)IBMC−Instituto de Biologia Molecular e CelularUniversidade do PortoRua Alfredo AllenPortoPortugal ICBAs−Instituto de Ciências Biomédicas Abel salazar Rua de Jorge Viterbo FerreiraPortoPortugal

Highly specific interactions between biomolecules,such as antigen-antibody,protein-ligand,or nucleic acid base pair complementary are on the basis of the organization of complex *** same principles may be tentatively used in molecular medicine for diagnosis and therapeutics.A molecule can be designed to selectively bind a protease and thereby inhibit the production of a peptide that forms toxic aggregates in the brain or an antibody may be produced to bind specifically to that peptide for detection or clearance ***,interference in biological systems is not that *** a start there is the inhibition of the physiological role of the protease;moreover,several cleavage fragments may be produced,which may continue to diverge due to putative post-translational modification and self-assembly processes,hiding the toxic target in a“soup”of peptide species varying in size,structure and chemical composition.A perspective of the current status and challenges in targeting peptide species for diagnosis and treatment in the context of Alzheimer’s disease is given.

关键词： Alzheimer diagnosis thereby