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Entropy generation minimization in the Carreau nanofluid flow over a convectively heated inclined plate with quadratic thermal radiation and chemical reaction:A Stefan blowing application

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Propulsion and Power Research 2024年第2期13卷 233-244页

作者： B.Lavanya j.Girish Kumar M.jayachandra babu C.S.K.Raju Bander Almutairi Nehad Ali Shah Department of Mathematics Manipal Institute of TechnologyManipal Academy of Higher EducationManipalKarnataka 576104India Department of Mathematics S.V.A Government CollegeSrikalahasti 517644India Department of Mathematics GITAM School of Science(GSS)GITAMBangaloreKarnatakaIndia Department of Mathematics College of ScienceKing Saud UniversityRiyadh 11451Saudi Arabia Department of Mechanical Engineering Sejong UniversitySeoul 05006South Korea

Entropy analysis can help to identify the sources of entropy generation in a heat transfer process more accurately than other methods,such as energy efﬁciency *** is because entropy analysis takes into account the quality of energy as well as its ***-noﬂuids have already been shown to have superior heat transfer characteristics compared to conventionalﬂ*** blowing can further enhance the heat transfer capabilities of nano-ﬂuids by increasing the massﬂux and turbulence at the *** can be beneﬁcial in a wide range of applications,such as heat exchangers,electronic cooling,and solar energy *** convective boundary condition accounts for heat transfer effects,inﬂuencing temperature distribution and the thermal boundary *** on the direction of heat transfer,the convective boundary condition can induce cooling or heating effects on the inclined *** has practical implications for various engineering applications,such as the cooling of electronic devices or heating in industrial *** nanofluids have a wide range of potential applications in heat transfer,energy storage,drug delivery,and food *** research investigates how the presence of Stefan blowing affects the properties of Carreau nanofluid flow across a convectively heated tilted *** and mass transport phenomena are studied using quadratic thermal radiation and chemical reaction *** mathematical model for this work is based on the Buongiorno *** governing equations are converted into a system of ordinary differential equations and then solved using the bvp4c *** parameters such as the mass transfer rate can be visualized using bar *** study’s primary findings are that when the Weissenberg number increases,the velocity rises and the concentration profile declines due to Brownian *** is discovered that,when 0.5≤γ≤3(the inverse porosity parameter),the friction factor declines by 0.34001(

关键词： Thermal radiation BVP4C Stefan blowing Biot number Brownian motion Irreversibilit

Evaluation of the microstructure, secondary dendrite arm spacing, and mechanical properties of Al–Si alloy castings made in sand and Fe–Cr slag molds

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International journal of Minerals,Metallurgy and Materials 2017年第7期24卷 784-793页

作者： I.Narasimha Murthy j.babu Rao Department of Metallurgical Engineering Andhra University Visakhapamam 530003 India

The microstructure and mechanical properties of as-cast A356（Al–Si） alloy castings were investigated. A356 alloy was cast into three different molds composed of sand, ferrochrome（Fe–Cr） slag, and a mixture of sand and Fe–Cr. A sodium silicate–CO_2 process was used to make the necessary molds. Cylindrical-shaped castings were prepared. Cast products with no porosity and a good surface finish were achieved in all of the molds. These castings were evaluated for their metallography, secondary dendrite arm spacing（SDAS）, and mechanical properties, including hardness, compression, tensile, and impact properties. Furthermore, the tensile and impact samples were analyzed by fractography. The results show that faster heat transfer in the Fe–Cr slag molds than in either the silica sand or mixed molds led to lower SDAS values with a refined microstructure in the products cast in Fe–Cr slag molds. Consistent and enhanced mechanical properties were observed in the slag mold products than in the castings obtained from either sand or mixed molds. The fracture surface of the slag mold castings shows a dimple fracture morphology with a transgranular fracture nature. However, the fracture surfaces of the sand mold castings display brittle fracture. In conclusion, products cast in Fe–Cr slag molds exhibit an improved surface finish and enhanced mechanical properties compared to those of products cast in sand and mixed molds.

关键词： silica sand ferrochrome slag alloy castings secondary dendrite arm spacing mechanical properties

Effects of various parameters on the attrition of bed material in a recirculating fluidized bed with a draft tube

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Particuology 2018年第3期16卷 61-70页

作者： Shivali Chourasia babu j. Alappat Department of Civil Engineering Indian Institute of Technology Delhi Hauz Khas New Delhi 110016 India

We performed an experimental study to investigate the effects of various parameters on the attrition of bed material and its size distribution with increasing operation time in a recirculating fluidized bed （RCFB）. The studied parameters included superficial velocity of fluidizing air, bed inventory, and spacing between the jet top and draft tube bottom （spacer height）. The bed material was prepared from Indian Standard （IS） Grade I sand from sieves with a size range of 2.20-1.00 mm. Experiments were performed at ambient conditions, with the superficial air velocity ranging from 7.13-9.16 m/s, a bed inventory of 7-10 kg, spacing of 0.085 and 0.045 m between the jet top and draft tube bottom, and an operating time of 40 h. We investigated the influence of these parameters in terms of changes in the size distribution of particles, changes in the %-weight of particles of different size ranges, generation of particles with smaller diameters, the decrease of the downcomer bed height, variations in the coefficient of uniformity and coefficient of curvature, and material loss from entrainment of fines with increasing operation time. The mode of attrition was abrasion in all experiments. We found that with increasing operation time and other parameters （bed inventory, superficial air velocity, and spacer height） attrition of the bed material also increased. Generation and elutriation of fines were more pronounced at higher superficial air velocity, bed inventory, and spacer height.

关键词： Attrition Recirculating fluidized bed (RCFB) Fluidization Elutriation Fines

Adaptive Fuzzy Logic Despeckling in Non-Subsampled Contourlet Transformed Ultrasound Pictures

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Intelligent Automation & Soft Computing 2023年第3期35卷 2755-2771页

作者： T.Manikandan S.Karthikeyan j.jai jaganath babu G.babu Department of Electronics and Communication Engineering Rajalakshmi Engineering CollegeChennai602105India Department of Electronics and Communication Engineering Velammal Institute of TechnologyChennai601204India Center for System Design Chennai Institute of TechnologyChennai600069India Department of Bio-Medical Engineering Easwari Engineering CollegeChennai600089India

Signal to noise ratio in ultrasound medical images captured through the digital camera is poorer,resulting in an inaccurate *** a result,it needs an efﬁcient despeckling method for ultrasound images in clinical practice and *** article proposes a novel adaptive fuzzyﬁlter based on the direc-tionality and translation invariant property of the Non-Sub sampled Contour-let Transform(NSCT).Since speckle-noise causes fuzziness in ultrasound images,fuzzy logic may be a straightforward technique to derive the output from the noisy ***ﬁltering method comprises detection andﬁltering ***,image regions classify at the detection stage by applying fuzzy inference to the directional difference obtained from the NSCT noisy ***,the system adaptively selects the better-suitedﬁlter for the speciﬁc image region,resulting in signiﬁcant speckle noise suppression and retention of detailed *** suggested approach uses a weighted averageﬁlter to distinguish between noise and edges at theﬁltering *** addition,we apply a structural similarity mea-sure as a tuning parameter depending on the kind of noise in the ultrasound *** proposed methodology shows that the proposed fuzzy adaptiveﬁlter effectively suppresses speckle noise while preserving edges and image detailed structures compared to existing approaches.

关键词： Image processing fuzzy logic directional differences classiﬁcation ultrasound technology

Interaction study between Ocimum sanctum and Glimepiride(sulfonylurea derivative) in diabetic rats

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journal of Chinese Pharmaceutical Sciences 2015年第3期24卷 156-163页

作者： Mohd Fasih Ahmad Raj K.Keservani D j Mani babu Department of Pharmacology V. L. College of Pharmacy School of Pharmaceutical Sciences Rajiv Gandhi Proudyogiki Vishwavidyalaya

The present study was intended to discover the interaction between Ocimum sanctum(O. sanctum) and Glimepiride, a sulfonylurea derivative used in the treatment of type-2 diabetes, in diabetic rats to suggest an alteration in the dose of Glimepiride in case of hypoglycaemia. LD50 studies for the aqueous extract of O. sanctum leaf were carried out in albino mice up to the dose level of 2000 mg/kg. O. sanctum at low, medium and high doses(100, 200 and 400 mg/kg, per oral), respectively and Glimepiride ?(half) therapeutic dose, therapeutic dose and 2 time therapeutic dose(0.036, 0.072 and 0.144 mg/200 g, per oral) were selected. After the treatment with O. sanctum and Glimepiride as single doses and in various combinations of these two drugs in streptozotocin-induced diabetic rats serum glucose levels in all the groups were analysed by the glucose oxidase-peroxidase method. When administered alone as single doses both aqueous extract of O. sanctum leaf and Glimepiride produced a significant anti-diabetic effect in diabetic rats. The anti-diabetic effect observed with combination of aqueous extract of O. sanctum leaf and Glimepiride was significant and more when compared to either of the drugs given alone. There was a definite interaction that necessitates dose readjustment of Glimepiride and further glucose levels are to be frequently monitored to avoid complication of hypoglycemic condition with aqueous extract of O. sanctum leaf and Glimepiride combination.

关键词： Herb-drug interaction Ocimum sanctum Glimepiride Type-2 diabetes

Colloidal synthesis and characterization of Cu_2ZnSnS_4 nanoplates

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journal of Semiconductors 2017年第3期38卷 110-115页

作者： S.Ananthakumar j.Ram Kumar S.Moorthy babu Crystal Growth Centre Anna University Department of Physics Faculty of Physical and Mathematical SciencesUniversity of Concepcion

Synthesis of copper zinc tin sulphide（Cu_2ZnSnS_4/ with nanoplate morphology was achieved through colloidal method using oleic acid as capping agent and solvent with 1-octadecene（1-ODE） at 240°C.X-ray diffraction（XRD） analysis shows that the synthesized nanoplates possessed pure kesterite *** analysis clearly shows the formation of nanoplates having the size of about 50–100 *** spin resonance（ESR） spectrum analysis of the prepared nanoplates shows that the valence state of copper（II） which indicates the strong coupling with other metal *** gravimetric/differential thermal analysis（TG/DTA） analysis shows the weight loss of sample at 450°C predicting the loss of capping ligands on the surface of the *** possible mechanism for the conversion of nanoplate-like structures during synthesis was *** results are discussed in detail.

关键词： colloidal method solar cells kesterites nanoplates oleic acid

SYNCHRONIZATION OF SINGULAR MARKOVIAN jUMPING NEUTRAL COMPLEX DYNAMICAL NETWORKS WITH TIME-VARYING DELAYS VIA PINNING CONTROL

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Acta Mathematica Scientia 2020年第3期40卷 863-886页

作者： K.S.ANAND j.YOGAMBIGAI G.A.HARISH babu M.SYED ALI S.PADMANABHAN APS College of Engineering Bangalore 560082India MMES College of Arts and Science MelvisharamTamilnaduIndia Reva Institute of Technology and Management Bengaluru-560064 Department of Mathematics Thiruvalluvar UniversityVelloreTamilnadu 632115India RNS Institute of Technology ChannasandraBangalore 560098India

This article discusses the synchronization problem of singular neutral complex dynamical networks(SNCDN)with distributed delay and Markovian jump parameters via pinning *** control strategies are designed to make the singular neutral complex networks *** delay-dependent synchronization criteria are derived in the form of linear matrix inequalities based on a modified Lyapunov-Krasovskii functional *** applying the Lyapunov stability theory,jensen's inequality,Schur complement,and linear matrix inequality technique,some new delay-dependent conditions are derived to guarantee the stability of the ***,numerical examples are presented to illustrate the effectiveness of the obtained results.

关键词： Singular complex networks synchronization Lyapunov-krasovski method markovian jump pinning control linear matrix inequality

Continuous segregation of binary heterogeneous solids in a fast-fluidized bed

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Particuology 2017年第6期15卷 101-107页

作者： M. Prasad babu P.S.T. Sai K. Krishnaiah Department of Chemical Engineering Indian Institute of Technology Madras Chennai 600 036 India

Continuous segregation of binary heterogeneous solids （different density mixtures） is carried out in a gas-solid fluidized bed to study the effects of gas velocity, solids feed rate, feed composition and density difference of solids on the separation factor （recovery of flotsam at top outlet） and the quality of the product （purity of flotsam at top outlet） in a continuous fast-fluidized bed. The holdup of the bed material is obtained in each experimental run. It is observed that the separation factor decreases with increase in solids feed rate or density difference of solids, and increases with gas velocity or proportion of flotsam in the feed. The quality of the product decreases with increase in gas velocity or solids flow rate, and increases with feed composition or density difference of solids. The experimental results show that the separation factor and the quality of the product are more sensitive to gas velocity than to other operating parameters, Empirical correlations for predicting the separation factor and quality of the product are proposed based on the Richards model for individual flotsam mass fraction in the feed, and the predictions agree satisfactorily with the present exlgerimental data,

关键词： Fast-fluidized bed Gas-solid Continuous segregation Heterogeneous solids Solids holdup

Expeditious management plan towards digital earth

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International journal of Digital Earth 2014年第8期7卷 635-649页

作者： Naveen Kumar Sidda Aneta j.Florczyk Francisco j.Lopez-Pellicer Dinesh babu I.V Ruben Bejar F.javier Zarazaga-Soria Department of Computer Science and System Engineering University of ZaragozaZaragozaSpain Department of Wood Science forestry and GeomaticsUniversity LavalSainte-FoyQCCanada

The breakthrough developments in geospatial technologies and the increasing availability of spatial data make geoinformation a business and a decisional element to the ***,it is important to have a management plan to factor in practical and feasible data sources,in building geo *** authors of this paper are motivated by the fact that right data sources could outclass in-house resources in various application *** paper outlines pragmatic cases for the tangible benefits of the existing potential data and expeditious patterns for digital *** work also proposes‘good-enough’solutions based on the pragmatic cases,available literature,and the 3D city model developed that could be sufficient in contriving the objectives of the common public usage and open business *** demonstrate this approach,the paper encapsulated the low-cost development of virtual 3D city model using publicly available cadastral data and web services.

关键词： spatial data sources geo management web services APIs cadastral data