bluuebunny/crossref_metadata_2025_split huggingface dataset:
Melting heat transfer in a nanofluid flow past a permeable continuous moving surface
Authors: Gorla Rama S.R. , Chamkha Ali J. , Aloraier Abdulkareem 
Published: January 2012

A boundary layer analysis is presented for the warm, laminar nanoliquid flow to a melting surface moving parallel to a uniform free stream. The resulting system of non-linear ordinary differential equations is solved numerically using Runge-Kutta method with shooting techniques. Numerical results are obtained for the velocity, temperature and concentration distributions, as well as the friction factor, local Nusselt number and local Sherwood number for several values of the parameters, namely the velocity ratio parameter, melting parameter and nanofluid parameters. The obtained results are presented graphically and in tabular form and the physical aspects of the problem are discussed.Keywords: Suction/injection; moving surface; nanofluid; boundary layer; shooting technique. doi: http://dx.doi.org/10.3329/jname.v8i2.6830 Journal of Naval Architecture and Marine Engineering 8(2011) 83-92
A flexible system for initial ship design parameters estimation using a system of neural networks
Authors: Senousy Hamada , Abou-Elmakarem Mahmoud 
Published: January 2012

To initialize ship design process, it is very important to be able to develop an initial estimate of ship parameters to satisfy designer required specifications. For new emerging designs, this estimate has to be made based on a limited available set of examples. Moreover, a practical estimate prediction strategy should be flexible enough having no distinction between input (specified constraints) and outputs (parameters required to be estimated), since these vary from one design case to another. Conventional regression-based techniques, which are usually employed to provide the required estimates, suffer from low accuracy in case of a small number of available examples. In addition to that, they fail to capture the interrelation between different design parameters. To overcome these limitations and others, the present paper proposes a new approach based on a system of artificial neural-networks (ANNs). The new approach not only overcomes regression limitations but is also capable of providing a reliable estimate of initial design offset table based on different ANN outputs. The paper uses a case study for demonstrating the merits of the proposed approach.Keywords: Ship design; regression; ship series; Artificial Neural Networks (ANNs); Multilayer Perceptrons (MLPs); Normalized Gaussian Modified Lagrangian (NGML) doi: http://dx.doi.org/10.3329/jname.v8i2.6945 Journal of Naval Architecture and Marine Engineering 8(2011) 71-82
Application of non-linear k-e turbulence model in flow simulation over underwater axisymmetric hull at higher angle of attack
Authors: Sakthivel R , Vengadesan S , Bhattacharyya S K 
Published: January 2012

This paper addresses the Computational Fluid Dynamics Approach (CFD) to simulate the flow over underwater axisymmetric bodies at higher angle of attacks. Three Dimensional (3D) flow simulation is carried out over MAYA Autonomous Underwater Vehicle (AUV) at a Reynolds number (Re) of 2.09×106. These 3D flows are complex due to cross flow interaction with hull which produces nonlinearity in the flow. Cross flow interaction between pressure side and suction side is studied in the presence of angle of attack. For the present study standard k-ε model, non-linear k-ε model models of turbulence are used for solving the Reynolds Averaged Navier-Stokes Equation (RANS). The non-linear k-ε turbulence model is validated against DARPA Suboff axisymmetric hull and its applicability for flow simulation over underwater axisymmetric hull is examined. The non-linear k-ε model performs well in 3D complex turbulent flows with flow separation and flow reattachment. The effect of angle of attack over flow structure, force coefficients and wall related flow variables are discussed in detail. Keywords: Computational Fluid Dynamics (CFD); Autonomous Underwater Vehicle (AUV); Reynolds averaged Navier-Stokes Equation (RANS); non-linear k-ε turbulence modeldoi: http://dx.doi.org/10.3329/jname.v8i2.6984 Journal of Naval Architecture and Marine Engineering 8(2011) 149-163
Effective simple methods for numerical modelling of marine engines in ship propulsion control systems design
Authors: Altosole M. , Figari Massimo 
Published: January 2012

In the last year, the Department of Naval Architecture and Marine Engineering of Genoa University (now Department of Naval Architecture, Marine Technology and Electrical Engineering) collaborated to the design of the propulsion automation of two different naval vessels; within these projects the authors developed different ship propulsion simulators used to design and test the propulsion control schemes. In these time-domain simulators, each propulsion component is represented by a specific mathematical model, mainly based on algebraic and differential equations. One of the key aspects of the propulsion simulation is the engine dynamics. This problem in principle can be dealt with models based on thermodynamic principles, which are able to represent in detail the behaviour of many variables of interest (engine power and speed, air and gas pressures, temperatures, stresses, etc.). However, thermodynamic models are often characterized by a long computation-time and moreover their development usually requires the knowledge of specific engine information not always available. It is generally preferable to adopt simpler simulation models, for the development of which, very few kinds of information are necessary. In fact, for the rapid prototyping of control schemes, it is generally more important to model the whole plant (in a relatively coarse way) rather than the detailed model of some components. This paper deals with simple mathematical methods, able to represent the engine power or torque only, but they can be suitably applied to many types of marine engines in a straightforward way. The proposed simulation approaches derived from the authors’ experience, gained during their activity in the marine simulation field, and they are particularly suitable for a fast prototyping of the marine propulsion control systems. The validation process of these particular models, regarding a Diesel engine, a marine gas turbine and an electric motor, is illustrated based on the sea trials data and engine manufacturers’ data. Keywords: Dynamic simulation; marine engines performance; gas turbine; propulsion control. doi: http://dx.doi.org/10.3329/jname.v8i2.7366 Journal of Naval Architecture and Marine Engineering 8(2011) 129-147
Synthesis, Antitumor and Antimicrobial Activities of Some Novel 1-(Substituted)-3-Methyl-1<i>H</i>-Pyrazol-5(4<i>H</i>)-One
Authors: Antre R. V. , Cendilkumar A. , R. Nagarajan R. , Goli D. , Oswal R. J. 
Published: January 2012

Several 1-(substituted)-3-methyl-1H-pyrazol-5(4H)-one as RA1-RA9 were synthesized and compounds were screened for antitumor activity against Ehrlich ascites carcinoma (EAC) cells and antimicrobial activity. Elemental analysis, mass spectral data, 1H-NMR, and IR confirmed the structure of the newly synthesized compounds. Some of the tested compounds showed good antitumor and antimicrobial activity. Compounds RA1, RA4, and RA9 exhibit highest antitumor activity against EAC cells in comparison with 5-flurouracil as standard drug.Keywords: Ehrlich ascites carcinoma; Pyrazolone; Antitumor; N-substitution; Antimicrobial.© 2012 JSR Publications. ISSN: 2070-0237 (Print); 2070-0245 (Online). All rights reserved.doi: http://dx.doi.org/10.3329/jsr.v4i1.7027 J. Sci. Res. 4 (1), 183-192 (2012)
On Some R<sub>1</sub>-Properties in Fuzzy Topological Spaces
Authors: Ali D. M. , Azam F. A. 
Published: January 2012

In this paper, we introduce six R1-axioms for fuzzy topological spaces (in short, fts). We study their interrelations, goodness and initialities. Besides we recall nine R0-axioms for fts. A complete answer is given with regard to all possible (R1=>R0)-type implications for fts.Keywords: Fuzzy topological space; Fuzzy R1-axiom; Fuzzy R0-axiom.© 2012 JSR Publications. ISSN: 2070-0237 (Print); 2070-0245 (Online). All rights reserved.doi:10.3329/jsr.v4i1.7044 J. Sci. Res. 4 (1), 21-32 (2012)
Essential Mechanical Properties of Structural Steels for Steel Reinforced Buildings in the Earthquake Sensitive Areas
Authors: Islam M. A. 
Published: January 2012

During earthquake, the ground along with its various natural and manmade structures experiences shaking of various intensities and frequencies depending on the nature of the earthquake. The loading activities caused by earthquakes on various structures are very much cyclic type, which is popularly known as fatigue loading. On the other hand, for modern high-rise buildings a large volume of steel bar is used to reinforce the concrete because of the pioneer role of steel bars embedded inside the concrete for safety of the buildings. In this study various mechanical properties of reinforcing steel bars that are essential to counter balance the earthquake effects have been identified first. At the same time these essential mechanical properties have been defined and studied for most commonly used reinforcing steel bars. For doing this, both the conventional and advanced structural steels were selected. The mechanical properties and fatigue behaviours of these steels have been presented and discussed in this paper. Keywords: Earthquake; High-rise buildings; Reinforcing steel bars; Conventional structural steel; Advanced structural steel.© 2012 JSR Publications. ISSN: 2070-0237 (Print); 2070-0245 (Online). All rights reserved.doi: http://dx.doi.org/10.3329/jsr.v4i1.7069 J. Sci. Res. 4 (1), 51-63 (2012)
Theoretical Studies on the Structural, Electronic and Optical Properties of the New &pi;-conjugated Copolymers Based on Carbazole and Thiophene
Authors: El Maliki Z. , Bouachrine M. , Hamidi M. , Bejjit L. , Haddad M. 
Published: January 2012

This work reports a theoretical investigation of π-conjugated oligomers constituted by n units (n = 1-4) based on carbazole and ethylenedioxythiophene. The molecular geometry, torsional potential, electronic and optical properties of the oligomers [Cbz-(Edot)n-Cbz] (n = 1-4) are investigated using DFT (B3LYP/3-21G*) calculations. The discussion is focused on the influence of chain length on the properties of these copolymers. The analyses of torsional angles for [Cbz-(Edot)4-Cbz] reveal that the structure has a anti-planar conformation. The electronic properties of the molecules, HOMO, LUMO and Eg (HOMO-LUMO), are studied using B3LYP functional. The results have been compared with those of thiophene and ethylenedioxythiophene. The lowest excitation energies (Eex) and the maximal absorption wavelength (λabs) are studied using the TD/DFT, ZINDO and CIS methods. The electronic transitions of the absorption spectrum derived by TD/DFT method give useful structural and electronic information for designing novel conducting organic polymer materials. The bridging effect by C=C(CN)2 on the optoelectronic properties of the (carbazole-thiophene-carbazole) comonomer is investigated. Keywords: Conducting polymer; Carbazole-(Ethylenedioxythiophene)n-Carbazole comonomers; DFT Optoelectronic properties; absorption coefficient; Bridging effect. © 2012 JSR Publications. ISSN: 2070-0237 (Print); 2070-0245 (Online). All rights reserved. doi: http://dx.doi.org/10.3329/jsr.v4i1.7450J. Sci. Res. 4 (1), 119-133 (2012)
Analysis of Chemical Components Involved in Germination Process of Rice Variety Jhapra
Authors: Islam M. , Ye X. 
Published: January 2012

Notice of withdrawal/removalThe article Analysis of Chemical Components Involved in Germination Process of Rice Variety Jhapra which appeared in J. Sci. Res. 4 (1), 251-262 (2012) has now been removed from journals website for violation of journals established policy.Journal of Scientific Research17 March 2012 doi: http://dx.doi.org/10.3329/jsr.v4i1.7598J. Sci. Res. 4 (1), 251-262 (2012)
<i>In vitro</i> Interaction of Metronidazole and Mebendazole with Copper (II) and Chromium (III) in Aqueous Media
Authors: Azam A. T. M. Z. , Siraji F. , Amran M. S. , Islam J. N. , Amjad F. M. , Hossain M. A. 
Published: January 2012

The interaction of metronidazole, an antiprotozoal agent and mebendazole, an important anthelmentic agent with Cu (II) and Cr(III) ions have been studied in aqueous systems at a fixed temperature of 37±0.5°C and at different pH values. It has been found that metronidazole and mebendazole form stable 1:1 complexes with Cu(II), but a less stable complex with Cr(III) ion. The studies were performed by electroanalytical and spectrophotometric methods. Spectral studies helped to detect initial complexation between the species. Conductometric titration indicated the nature of interaction and the stoichiometries of complexation. The conductometric study also indicated the formation of complexes of various molar ratios viz 1:2, 4:1, 3:1, 1:2, 1:3 and 1:4. etc. along with 1:1 complexes at various pH conditions. Similar types of complexation were observed by Job’s plots at various pH values. The Ardon’s spectroscopic method confirmed the 1:1 complexation and the values of stability constant were calculated using Ardon’s plot. Complexation at molar ratios 1:3 and 1:4 can not be ruled out. Keywords: Metronidazole; Mebendazole; Cu(II); Cr(III); Ardon’s plot; Complexation. © 2012 JSR Publications. ISSN: 2070-0237 (Print); 2070-0245 (Online). All rights reserved. doi: http://dx.doi.org/10.3329/jsr.v4i1.7599J. Sci. Res. 4 (1), 173-181 (2012)
Antimicrobial activity of <i>Cressa cretica</i> L., a Halophytic Plant
Authors: Sunita P. , Jha S. , Pattanayak S. P. , Mishra S. K. 
Published: January 2012

In the present investigation different fractions (hexane, ethylacetate and methanol) of the whole methanolic extract of Cressa cretica L.(Convolulaceae), a widely grown halophytic plant were studied against wide ranges of bacteria (both positive and negative strain) and five fungi Candida albicans, Candida tropicalis – dimorphic fungi, Aspergillus fumigatus, Aspergillus niger – systemic fungi and fusarium oxysporum by agar disc diffusion method. Among the three fractions the ethylacetate fraction of C.cretica showed the highest activity, but among the pathogens highest activity was revealed against Escherichia coli, Klebsiella pneumoniae (zone of inhibition diameter in mm was found to be 26 and 31, respectively). The ethylacetate fraction was sensitive to both gram +ve and gram –ve bacterias. C.cretica showed higher inhibitory activity against the Aspergillus fumigates, Aspergillus niger (zone of inhibition diameter in mm was found to be 26 and 22, respectively) than the Candida albicans and Candida tropicalis and least was found for Fusarium oxysporum. As ethylacetate fraction revealed better activity than other fractions, further study of morphological and biochemical alterations were carried out only with ethylacetate fraction and the results revealed some morphological and biochemical alterations, which indicates that ethylacetate fraction of C. cretica possess potential broad spectrum antimicrobial activity.Keywords: Cressa cretica; Antifungal; Gram positive bacteria; Gram negative bacteria; Biochemical alterations.© 2012 JSR Publications. ISSN: 2070-0237 (Print); 2070-0245 (Online). All rights reserved.doi: http://dx.doi.org/10.3329/jsr.v4i1.7719J. Sci. Res. 4 (1), 203-212 (2012)
Synthesis of Biheterocycles Containing Indole Nucleus and Their Antibacterial Activity
Authors: Jain S. , Reddy B. N. , Rao K. S. 
Published: January 2012

Indole-3-carboxaldehydes (1a-d) undergo condensation with ethyl cyanoacetate and malononitrile to give the acrylonitrile 2a-d and 3a-d which on reaction with hydrazine hydrate yield 3,5-diamino-5-hydroxy-4-(3-indolylmethylene)pyrazoles (4a-d) and 3-amino-5-hydroxy -4-(3-indolylmethylene)pyrazoles (5a-d), respectively. The new compounds were also screened for their antibacterial activity.Keywords: Indole-3-carboxaldehydes ; Active methylene compounds; Base; Hydrazine hydrate; Pyrazoles.© 2012 JSR Publications. ISSN: 2070-0237 (Print); 2070-0245 (Online). All rights reserved.doi: http://dx.doi.org/10.3329/jsr.v4i1.7821 J. Sci. Res. 4 (1), 273-278 (2012)
Synthesis and Characterization of Methoxy-bridged Bis(silylene)tungsten Complexes
Authors: Begum R. , Islam S. M. S. 
Published: January 2012

Synthesis of two methoxy bridged bis(silylene) complexes (CpMe4)W(CO)2 {(Et2Si)••OMe••(SiMe2)}(3) and (CpMe)W(CO)2 {(Et2Si)••OMe••(SiMe2)}(4) have been synthesized. Both the compounds contain chiral tungsten center and formed via oxidative addition of an Si-H bond to a coordinatively unsaturated metal center. The complexes were characterized by 1H, 13C, 29Si NMR, IR and elemental analysis. A plausible mechanism of formation is also suggested.Keywords: Coordinatively unsaturated; Chiral tungsten; Oxidative addition.© 2012 JSR Publications. ISSN: 2070-0237 (Print); 2070-0245 (Online). All rights reserved.doi: http://dx.doi.org/10.3329/jsr.v4i1.7890J. Sci. Res. 4 (1), 109-118 (2012)
Generalized Derivations Acting as Homomorphisms and Anti-Homomorphisms of Gamma Rings
Authors: Dey K. K. , Paul A. C. 
Published: January 2012

Let M be a prime G-ring and let I be a nonzero ideal of M. Suppose that D: M ® M is a nonzero generalized derivation with associated derivation d : M ® M. Then we prove the following: (i) If D acts as a homomorphism on I, then either d = 0 on M or M is commutative.(ii) If M satisfies the assumption (*) (see below), and if D acts as an anti-homomorphism on I, then either d = 0 on M or M is commutative.Keywords: Prime G-rings; Generalized derivations; Torsion free G-rings; Homomorphisms; Anti-homomorphisms.© 2012 JSR Publications. ISSN: 2070-0237 (Print); 2070-0245 (Online). All rights reserved.doi: http://dx.doi.org/10.3329/jsr.v4i1.7911J. Sci. Res. 4 (1), 33-37 (2012)
Diffusion Interactions of Some Biologically Important Transition Metal Complexes on Micellar Properties of Sodium Dodecyl Sulphate
Authors: Hossain M. A. , Rahman M. A. , Subhan M. A. 
Published: January 2012

The specific conductance of aqueous solutions of sodium dodecyl sulphate (SDS) was measured from 20 to 35 ºC with an interval of 5 °C in the absence and presence of metal complexes such as [Cr(acac)2(H2O)2]Cl, K3[Fe(C2O4)3] and (NH4)4[Co(C6H5O7)2] at concentrations ranging from 2.0 × 10-4 to 8.0 x 10-4 M. The specific conductance rapidly increased at the pre-micellar region with increasing of temperature and concentration of SDS, but after critical micelle concentration (CMC) the rate of increase was slower. As the concentrations of metal complexes [Cr(acac)2(H2O)2]Cl, K3[Fe(C2O4)3] and (NH4)4[Co(C6H5O7)2] increased, the CMC of SDS decreased exponentially, which was sharp with increasing temperature. The CMC decreases due to the formation of pre-micellar aggregates of the positive counter ions of the complexes with dodecyl sulphate ions (DS-) and hydrophobic interaction between ligands of complexes and hydrophobic tail of SDS. The pre-micellar aggregate formation was essentially influenced by the counter ions binding abilities to the anionic micelle. The effect of metal complexes on lowering the CMC of SDS was found to follow the order [Cr(acac)2(H2O)2]Cl < K3[Fe(C2O4)3] < (NH4)4[Co(C6H5O7)2]. Thermodynamics of metal complexes with SDS and parameters of micellization ΔG°mic, ΔH°mic and TΔS°mic were calculated.Keywords: Surfactants; Sodium dodecyl sulphate; Critical micelle concentration; Pre-micellar aggregate; Hydrophobic interaction.© 2011 JSR Publications. ISSN: 2070-0237 (Print); 2070-0245 (Online). All rights reserved.doi: http://dx.doi.org/10.3329/jsr.v4i1.7989J. Sci. Res. 4 (1), 135-141 (2012)
Extraction Equilibrium of Ni(II) in the Ni<sup>2+</sup>-SO<sub>4</sub><sup>2-</sup>-Ac<sup>-</sup>(Na<sup>+</sup>, H<sup>+</sup>) - Cyanex 272 (H<sub>2</sub>A<sub>2</sub>)-kerosene-3%(v/v) Octan-1-ol System
Authors: Biswas R. K. , Karmakar A. K. , Rahman M. S. 
Published: January 2012

The title system has been studied elaborately. 3% (v/v) octan-1-ol is added as de-emulsifier. Equilibration time is < 2 min. Distribution ratio (D) at constant pH(eq) and [H2A2] is independent of [Ni(II)](aq). The pH dependency is always found to be 2; whilst the extractant dependence is found to vary from 1 (at lower concentration region, lcr) to 3 (at high concentration region, hcr). Moreover, the distribution ratio is found to be inversely proportional to (1+6.92 [SO42-]) and [Ac-]. Based on these results, the extraction equilibrium reactions have been proposed at various parametric conditions. The extraction process is endothermic (?H = 54.66 kJ/mol). The Kex values at 303 K are evaluated to be 10-11.086 and 10-11.56 at lcr and hcr of extractant, respectively. The maximum loading capacity is 21.28 g Ni(II) per 100 g extractant indicating the formation of NiAcA at maximum loading. The stripping ability of various inorganic acids towards loaded nickel, as well as, the possibilities of separation of Ni(II) from its binary mixtures with other ions of 3d-block elements have also been investigated.Keywords: Extraction equilibrium; Ni(II) extraction; Cyanex 272; Sulphate-acetato medium; Kerosene-octanol.© 2012 JSR Publications. ISSN: 2070-0237 (Print); 2070-0245 (Online). All rights reserved.doi: http://dx.doi.org/10.3329/jsr.v4i1.8007J. Sci. Res. 4 (1), 83-97 (2012)
Joule Heating Effect on MHD Combined Convection in a Wavy Chamber Having Conducting Square Cylinder
Authors: Nasrin R. 
Published: January 2012

The current simulation is focused on MHD combined convection flow and heat transfer characteristics in a square lid driven chamber. At the centre of this chamber a heat conducting solid square cylinder is located. Galerkin weighted residual finite element method is used to solve the governing equations of mass, momentum and energy. The left vertical wall of the chamber is mechanically lid driven and having temperature Tcold and velocity V0. But the right wall is sinusoidal wavy pattern and contains more temperature (Thot) than the left lid. The top and bottom surfaces are adiabatic. The behavior of the fluid for the values of Joule heating parameter J (0, 1, 4, 7) and Richardson number Ri (0.1, 1, 10) is described in details. The variations of the average Nusselt number (Nu), the mean temperature of the fluid ( ) and the temperature at cylinder centre ( ) for various Ri and J are also presented. Maximum rate of heat transfer is occurred for the lowest J at each Ri.Keywords: MHD; Wavy chamber; Conducting cylinder; Combined convection; Finite element formulation.© 2012 JSR Publications. ISSN: 2070-0237 (Print); 2070-0245 (Online). All rights reserved.doi: http://dx.doi.org/10.3329/jsr.v4i1.8014J. Sci. Res. 4 (1), 39-49 (2012)
Psychopharmacological Studies of Hydro Alcoholic Extract of Whole Plant of <i>Marsilea quadrifolia</i>
Authors: Reddy K. S. , Reddy C. S. , Ganapaty S. 
Published: January 2012

The hydro alcoholic extract of the entire plant Marsilea quadrifolia (HEMQ) was evaluated for different psychopharmacological actions such as behaviour, exploratory behaviour, muscle relaxant activity and phenobarbitone induced sleeping time. The extract was found to cause reduction in spontaneous activity, decrease in exploratory behavioural pattern by swimming and pole climbing test., reduction in the muscle relaxant by traction test. In addition, the extract signi?cantly potentiated the phenobarbitone-induced sleeping time. Preliminary tests indicate that the hydro alcoholic extract of Marsilea quadrifolia in doses of 200-400 mg/kg has signi?cant psychopharmacological activity.Keywords: Marsilea quadrifolia; Hydro alcoholic extract; Muscle relaxant; Exploratory behaviour.© 2012 JSR Publications. ISSN: 2070-0237 (Print); 2070-0245 (Online). All rights reserved.doi: http://dx.doi.org/10.3329/jsr.v4i1.8159J. Sci. Res. 4 (1), 279-285 (2012)