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Cu-water nanofluid flow induced by a vertical stretching sheet in presence of a magnetic field with convective heat transfer

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Propulsion and Power Research 2017年第3期6卷 206-213页

作者： Kalidas Das Amit Sarkar prabir kumar kundu Dept.of Mathematics A.B.N.Seal CollegeCooch Behar 736101West BengalIndia Dept.of Mathematics Jadavpur UniversityKolkata 700032West BengalIndia

The convective heat transfer performance of nanofluid over a permeable stretching sheet with thermal convective boundary condition in presence of magnetic field and slip velocity is studied in the present ***-water nanofluid is used to investigate the effect of nanoparticles on the flow and heat transfer *** numerical results are compared with published results and are found in an excellent *** influences of various relevant parameters on the velocity and temperature as well as the rate of shear stress and the rate of heat transfer are elucidated through graphs and *** is observed that nanoparticles volume fraction and surface convection parameter both increase the thickness of thermal boundary layer.

关键词： Nanofluid Slip velocity Magnetic field Convective boundary condition

Phytochemical Screening and Evaluation of Pharmacological Potential of Baliospermum solanifolium Leaf Extract

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Clinical Complementary Medicine and Pharmacology 2024年第1期4卷 69-75页

作者： Amit Mazumder Rabindra Nath Acharyya Milton kumar kundu Pritam kundu Md.Amirul Islam Md.Mustafizur Rahman Pharmacy Discipline Khulna UniversityKhulna-9208Bangladesh

Background:Baliospermum solanifolium is a traditional medicinal plant,locally known as“dantigaacha”from Eu-phorbiaceae family,and has been used in different diseases treatments likes helminthiasis,skin diseases,diabetes,snake-bite,and ***:Depending on the traditional uses of *** and the lack of scientific works,we aimed to conduct some pharmacological tests on its ***:Active constituents of *** were assessed by qualitative ***(2,2-diphenyl-1-picrylhydrazyl)was used for free radical scavenging *** change and mortality rate were used as indicators to assess the toxicity of *** antidiabetic potential was evaluated by oral glucose toler-ance test(OGTT)and alpha-glucosidase enzyme inhibitory *** antidiarrheal activity,castor oil-induced mice were *** test was carried out by disk diffusion assay and MIC ***,analgesic activity was done by acetic acid-induced writhing ***:*** contains alkaloids,carbohydrates,glycosides,flavonoids,tannis,phenolics *** toxicity test ensured the safety of the *** DPPH,the extract showed antioxidant activity with an IC50(con-centration needed to scavenge 50%DPPH)value of 61.65μg/*** phenolic,flavonoid and tannin contents were determined as 124 mg GAE/g,440 mg QE/g and 344 mg GAE/g dried extract,*** OGTT,the ex-tract reduced the blood glucose level *** the alpha-glucosidase inhibitory activity,the plant showed a concentration-dependent reduction of the enzyme at IC50 of 8.53 mg/*** the antidiarrheal test,*** inhibit defecation 30.69%and 53.41%at dose 250 mg/kg and 500 mg/kg,*** extract also showed antibacterial activity against four bacterial strains in the disk diffusion method and minimum inhibitory concen-tration(MIC)values were 62.5μg/mL,62.5μg/mL,125μg/mL and 62.5μg/mL against four bacterial strains,*** an

关键词： Baliospermum solanifolium Antioxidant Antidiabetic Antidiarrheal Antibacterial Analgesic

Trigonelline mitigates bleomycin-induced idiopathic pulmonary fibrosis in mice

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Asian Pacific Journal of Tropical Biomedicine 2024年第9期14卷 391-400,I0008-I0291页

作者： Swapnil Gavhane Chandrakant Gawli Sachin kumar Biswajit Das Gayatri Marathe Vishal S.Patil Harun M.Patel Basavaraj Bommanahalli Chanakya Nath kundu Chandragouda R.Patil R.C.Patel Institute of Pharmaceutical Education and Research Karwand NakaShirpurMaharashtra 425405India Department of Pharmacology Delhi Pharmaceutical Sciences and Research UniversityNew Delhi 110017India School of Biotechnology Kalinga Institute of Industrial TechnologyBhubaneshwar 751024India Gadag Institute of Medical Sciences GadagKarnataka 582103India

Objective:To evaluate the effect of trigonelline on bleomycin-induced idiopathic pulmonary fibrosis(IPF)and to explore its underlying mechanisms using network ***:IPF was induced in C57BL/6 mice by a single intratracheal instillation of bleomycin(5 mg/kg).Trigonelline was administered at doses of 25,50,and 100 mg/kg/day orally from the 2nd day post-bleomycin induction up to the 14th *** IPF-induced mice,lung coefficient,immune cell infiltration in bronchoalveolar lavage fluid,and oxidative stress were *** alterations in lung tissues were also ***,network pharmacology approach was conducted to reveal molecular interactions of bleomycin and trigonelline with targets of ***:Trigonelline treatment reduced bleomycin-induced oxidative stress and immune cell infiltration,and mitigated physiological changes in the lung tissues of ***,trigonelline alleviated bleomycin-induced histological alterations in lung *** pharmacology analysis showed that bleomycin and trigonelline interacted with IPF targets,such as NFKB1,HDAC2,HIF1A,and ***:The interaction of trigonelline with key IPF targets and its ameliorative effects on lung damage and oxidative stress highlight its potential in treating *** may be considered an antifibrotic agent for further clinical development.

关键词： Trigonelline Idiopathic pulmonary fibrosis Antifibrotic Bleomycin Network pharmacology

Estimation of discharge and its distribution in compound channels

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Journal of Hydrodynamics 2014年第1期26卷 144-154页

作者： MOHANTY prabir kumar KHATUA Kishanjit kumar Department of Civil Engineering National Institute of TechnologyRourkelaOrissaIndia

Results of research into a compound channel having width ratio （a） in excess of 11 are presented in the form of boun-dary shear distributions across the compound cross section. New relationship is derived between the percentage of shear carried by the flood plains （%S fp ） and the percentage of area occupied by the flood plains （%Afp ） . The equation so derived is taken as the basis to develop a new methodology to predict the stage discharge relationship specifically for wide compound channels using Darcy＇s friction factor （ f ） for the main channel and flood plain regions. The methodology also is used for compound channels with smaller width ratios by applying the appropriate relation for %S fp derived earlier by different researchers and seems to work well. Next, as a corollary to the methodology, separate formulae are proposed to estimate flow distribution in main channel and flood plain regions. The proposed method and its corollary are tested for their validity against well-published small-scale data series of pre-vious researchers along with some large-scale data series from EPSRC-FCF （A-Series） compound channel experiments and very good agreement is observed between the measured values and predicted values for total flow as well as zonal distribution of flow. The methodology is also applied to some compound river section data published in literature and is found to serve well the purpose of predicting flow in real world application. This new method gives the least RMS value of error for discharge prediction compared with some other well-known methods used for estimating stage-discharge relation in compound channels by considering all data sets.

关键词： compound channels boundary shear stage-discharge relationship discharge distribution friction factor

Factorial Correlators and Oscillatory Multiplicity Moments at the CERN SPS Energy for Ring-Like and Jet-Like Events

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Chinese Physics Letters 2011年第1期28卷 62-65页

作者： prabir kumar Haldar Sanjib kumar Manna Dinhata College Department of Physics Dinhata Coochbehar West Bengal India

We present an analysis of ring-like and jet-like events in terms of factorial correlations and oscillatory multiplicity moments of 32S Ag/Br interactions at 200 A OeV. The investigation reveals that the correlated moments increase with decrease in bin-bin separation D, following the power law, which suggests the presence of an intermittent nature of self-similar dynamical fluctuations pattern for ring-like and jet-like events. The analysis further shows that the strength of the non-statistical fluctuations is larger for jet-like events than those of ring-like events and total events. However, ring-like and jet-like events are not to be consistent with the total events of the c~ model of intermittency. To go beyond the lower order correlation, the oscillatory multiplicity moments are used to study the higher order correlation. The ratios Hq （cumulant over factorial moments, Kq/Fq） are determined for ring-like, jet-like and the total events. The presence of few-particle short range correlation is established. It is extremely interesting to observe that the oscillations of ring-like events are different from the jet-like events and the total events. However, in almost all the cases, the simulated interactions fail to replicate the experimental results.

关键词： Nuclear physics

Performance Evaluation of Modified Black Clay as a Heterogeneous Fenton Catalyst on Decolorization of Azure B Dye: Kinetic Study and Cost Evaluation

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Transactions of Tianjin University 2019年第5期25卷 527-539页

作者： Vijyendra kumar prabir Ghosh Department of Chemical Engineering National Institute of Technology(India)

Black clay (BC) was used as a catalyst for the decolorization of Azure B dye by Fenton process. BC was modi ed by acid, alkali, distilled water, and calcination to check their changes in characterization and e ciency on decolorization of Azure B. Among three modi ed catalysts, maximum decolorization was obtained by acid-modi ed BC (AMBC) catalyst due to the highest removal of impurities, comparatively. The characterization of AMBC was done by Fourier-transform infrared spectroscopy and X-ray di raction spectroscopy which show the presence of metal ion. The BET surface area, pore volume, pore size, and density of AMBC were calculated to be 79.402 m 2 /g, 0.0608 m 3 /g, 0.00306 nm, and 16 g/cm 3 , respectively. The highest decolorization of 97.59% was achieved only in 10 min using AMBC at optimized calcination of 100 °C and 3 h of aging. AMBC was considered as the main catalyst for optimizing the di erent process parameters. Optimized conditions were obtained: pH 2, 0.2 mL of H 2 O 2 , catalyst dose 0.3 g, room temperature (30 °C), and stirring speed 400 r/min. The catalyst has showed excellent stability and reusability. It could remove more than 85% of color even after four cycles of run and less than negligible leaching of iron. AMBC has good recycling ability among other modi ed catalysts. To check the selectivity of catalyst, di erent dyes such as Congo red and mixed dye (mixture of Azure B and Congo red) decolorization were studied. In the present work, kinetic study was also carried out and a three-stage decolorization process was found.

关键词： Black clay Azure B Heterogeneous Fenton process Wastewater treatment

Hybrid IWD-DE:A Novel Approach to Model Cooperative Navigation Planning for Multi-robot in Unknown Dynamic Environment

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Journal of Bionic Engineering 2019年第2期16卷 235-252页

作者： Degal Chandrasekhar Rao Manas Ranjan Kabat Pradipta kumar Das prabir kumar Jena Department of Information Technology VSSUTBurlaOdisha 768018India Department of Computer Science&Engineerings VSSUT、Burla Odisha 76801&India Department of Mechanical Engineering VSSUTBurlaOdisha 76801&India

The current study emphasizes inadequacies of earlier research findings on multi-robot navigation and offers a robust approach to guide the robots in an unknown dynamic *** attain the objective,the Intelligent Water Drop(IWD)algorithm is combined with Differential Evolution(DE)in a new conceptual fashion to optimize the navigation path of multiple mobile *** hybrid IWD-DE,basic IWD and DE algorithms are then explored for multi-robot navigation in a dynamic workspace through *** simulation outcomes demonstrate the competency of the proposed method to guide the robot in predicting the nature of the obstacle and to generate an optimal and safe trajectory in a dynamic *** potency of the proposed algorithm is further validated through experimentation with fire bird robot in a real *** outcomes of the simulation and experimentation,by employing IWD-DE algorithm are compared with those of basic IWD and DE *** error estimated for Average Navigation Path Travelled(ANPT),Aggregate Navigation Path Deviation(ANPD)and number of turns between simulation and experimental results by employing IWD-DE is 8.96,9.09,and 11.13,respectively while reaching 16.43,28.61,29.15 for IWD,and 6.66,10.20,14.28 for *** efficiency of the proposed approach is further verified with the state-of-the-art in a dynamic *** outcomes reveal the efficiency and flexibility of the proposed approach in resolving the multi-robot navigation problem as compared to the state-of-the-art in a dynamic workspace.

关键词： multi-robot dynamic environment intelligent water drop differential evolution navigation planning waypoints fire bird robot

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Chinese Physics Letters 2006年第11期23卷 2944-2947页

作者： Dipak Ghosh Argha Deb Samabrata Sarkar prabir kumar Haldar Nuclear and Particle Physics Research Centre Department of Physics Jadavpur University Kolkata-700032 India

The intermittent fluctuation of target evaporated particles is studied in both ring-like and jet-like events emitted in ^32 S-emulsion interactions at 200 A Ge V within the framework of multi-dimensional factorial moment methodology using the concept of the Hurst exponent. It is observed that the intermittent fluctuation in the ring-like event is self-similar, whereas in the jet-like event fluctuation is self-affine. However, study indicates that the strength of fluctuation in the ring-like events is much stronger than that in the jet-like events.

关键词： HIGH-ENERGY MULTIPARTICLE PRODUCTION JET-LIKE INTERMITTENCY DISTRIBUTIONS ANNIHILATION PARTICLES MOMENTS GEV/C

Evidence of Strong Pion Fluctuation in Jet-Like Events in ^32S-AgBr Interactions

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Chinese Physics Letters 2006年第4期23卷 815-818页

作者： Dipak Ghosh Argha Deb prabir kumar Haldar Sima Guptaroy Nuclear and Particle Physics Research Centre Department of Physics Jadavpur University Kolkata-700 032 India

We presents the analysis of ring-like and jet-like events in terms of Scaled Factorial Moments （SFMs） in one dimensional space up to the sixth order of moments for ^32S-AgBr interactions at 200 AGeV energy. The study reveals a power law growth of SFMs with decreasing bin width of the azimuthal distribution in the ^32S- AgBr data at 200 AGeV in both the cases. It is seen that strong intermittent pattern is revealed only in jet-like events.

关键词： Evidence of Strong Interactions