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Prediction of pressure gradient and hold-up in horizontal liquid-liquid pipe flow

Petroleum Science 2023年第6期20卷 3766-3782页

作者： syed Amjad Ahmed Bibin John School of Mechanical Engineering Vellore Institute of TechnologyIndia Department of Mechanical Engineering C Abdul Hakeem College of Engineering&TechnologyIndia

This paper aims to propose correlations to predict pressure gradient,friction factor and fluid phase hold-up in liquid-liquid horizontal pipe *** develop the correlations,experiments are conducted using high viscous oils(202 and 630 mPa⋅s)in a steel pipe of length 11.25 m and length-to-diameter ratio of *** addition,the experimental data from the literature comprising wide range of flow and fluid properties is *** the analysis,the liquid-liquid pipe flow data is categorized into two as:stratified and *** existing friction factor correlations are modified to incorporate the effects of viscosity of the oil phase,interfacial curvature(contact/wetting angle-in lieu of material of the pipe)and fluid phase *** the two-fluid model of stratified flow,the wall stress and interfacial stress correlations are substituted with superficial velocities of fluids and superficial Reynolds numbers of fluid phases replacing fluid phase velocities and fluid Reynolds ***,for dispersed flow,an effective Reynolds number is described as the sum of superficial Reynolds number of oil and water *** the generally employed mean or mixture Reynolds number with the effective Reynolds number into the existing single-phase turbulent flow friction factor correlation,an effective friction factor for oil-water flow is *** the proposed correlations,the pressure gradient across the oil-water flow and hold-up volume fraction are predicted with significant reduction in error compared with that of conventionally employed *** average error and standard deviation values of−7.06%,20.72%and 0.31%,18.79%are found for stratified flow and dispersed flow respectively.

关键词： oil-water flow two-fluid model pressure gradient stratified flow dispersed flow

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Robust H_∞ control for uncertain Markovian jump systems with mixed delays

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Chinese Physics B 2016年第7期25卷 108-113页

作者： R Saravanakumar M syed Ali Department of Mathematics Thiruvalluvar University

We scrutinize the problem of robust H∞control for a class of Markovian jump uncertain systems with interval timevarying and distributed delays. The Markovian jumping parameters are modeled as a continuous-time finite-state Markov chain. The main aim is to design a delay-dependent robust H∞control synthesis which ensures the mean-square asymptotic stability of the equilibrium point. By constructing a suitable Lyapunov–Krasovskii functional（LKF）, sufficient conditions for delay-dependent robust H∞control criteria are obtained in terms of linear matrix inequalities（LMIs）. The advantage of the proposed method is illustrated by numerical examples. The results are also compared with the existing results to show the less conservativeness.

关键词： linear matrix inequality Lyapunov method Markovian jumping parameters robust H∞ control

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MECHANICALLY AND THERMALLY STABLE BLENDS OF POLY(STYRENE-BUTADIENE-STYRENE) WITH CONDUCTING POLY(THIOUREA-AZO-NAPHTHYL)

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Chinese Journal of Polymer Science 2013年第12期31卷 1623-1631页

作者： Ayesha Kausar syed Tajammul Hussain Nanosciences and Catalysis Division National Centre for PhysicsQuaid-i-Azam University Campus

A new aromatic azo-polymer, poly（thiourea-azo-naphthyl）（PTAN）, has been synthesized using 1-（5- thiocarbamoylaminonaphthyl）thiourea and diazonium salt solution of 2,6-diaminopyridine. PTAN was easily processable using polar solvents and had high molar mass 57 × 10^3 g/mol. Electrically conducting, mechanically and thermally stable rubbery blends of poly（styrene-butadiene-styrene）（SBS） triblock copolymer and PTAN were produced by solution blending technique. FESEM of SBS/PTAN blends revealed nano-scale dispersion of the conducting filler showing good adhesion between the matrix and PTAN. Remarkable effects of azo-content on the conductivity of SBS-based blends have been observed. Accordingly, PTAN loading from 10 to 60 wt% increased the conductivity from 1.24 to 1.66 S/cm. Relationship between PTAN loading and thermal stability of the materials was also investigated. With increasing the PTAN content, 10% gravimetric loss was increased from 484 to 500 ℃, while glass transition was enhanced from 119 to 126 ℃. Thermal and conducting data of the blend showed better results relative to pure elastomer but were lower than those of the conducting filler. Similarly, the tensile strength （57.35-62.33 MPa） of SBS/PTAN was improved relative to there of SBS. Fine balance of properties renders new materials fairly better than the existing elastomeric blends used in a number of applications.

关键词： Poly(thiourea-azo-naphthyl) SBS Electrical conduction Thermal stability Tensile strength.

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Potassium ferro-cyanide trihydrate complex catalyzed one-pot synthesis of 2-phenylimidazo[4,5-f][1,10] phenanthroline

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Chinese Chemical Letters 2011年第7期22卷 793-796页

作者： syed Shahed Ali Organic Laboratory Department of Sir Sayyed CollegeDr.Babasaheb Ambedkarb Marathwada UniversityAurangabad 431001India

Various 2-phenylimidazo [4,5-f] [1,10] phenanthrolines were synthesized from potassium ferro-cyanide trihydrate （KFCT） complex catalyzed three component reaction of 1,10-phenanthroline-5,6-dione, aromatic aldehydes and ammonium acetate at room temperature in excellent isolated yield. This is a simple and straight forward, high yielding, not involving any hazardous or expensive catalyst method.

关键词： 2-Phenylimidazo [4,5-f] phenanthrolines Aromatic aldehyde K4[Fe(CN)6]·3H2O Ammonium acetate

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STOCHASTIC STABILITY OF UNCERTAIN RECURRENT NEURAL NETWORKS WITH MARKOVIAN JUMPING PARAMETERS

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Acta Mathematica Scientia 2015年第5期35卷 1122-1136页

作者： M.syed ALI Department of Mathematics Thiruval luvar University

In this paper, global robust stability of uncertain stochastic recurrent neural networks with Markovian jumping parameters is considered. A novel Linear matrix inequal- ity（LMI） based stability criterion is obtained to guarantee the asymptotic stability of uncertain stochastic recurrent neural networks with Markovian jumping parameters. The results are derived by using the Lyapunov functional technique, Lipchitz condition and S-procuture. Finally, numerical examples are given to demonstrate the correctness of the theoretical results. Our results are also compared with results discussed in [31] and [34] to show the effectiveness and conservativeness.

关键词： Lyapunov functional linear matrix inequality Markovian jumping parameters recurrent neural networks

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A rare complication of measles infection presented with subacute sclerosing panencephalitis: Report of two cases in India

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Asian Pacific Journal of Tropical Medicine 2024年第4期17卷 184-187页

作者： Razeen Fatima Amir husain Iram Tabish Department of Medicine JN Medical CollegeAMUAligarhIndia

Rationale:Subacute sclerosing panencephalitis(SSPE)is a progressive neurological disorder caused by persistent measles virus *** predominantly affects children and *** symptoms usually develop 6-15 years after measles infection and ultimately leading to death in many *** concerns:Patient 1 presented with cognitive decline and myoclonus and the Patient 2 presented with diminution of vision with myoclonic ***:Based on the clinical features with a characteristic electroencephalogram pattern and the presence of a high titer of anti-measles IgG in serum and cerebrospinal fluid,these patients were diagnosed as ***:Antiepileptics were started for controlling myoclonus along with supportive ***:Both patients were discharged on antiepileptics and supportive ***:Whenever there are unusual clinical manifestations with unknown vaccination status,SSPE can be suspected and the cerebrospinal fluid should be examined for anti-measles *** case study also highlights the importance of universal coverage of measles *** reduce the incidence of measles and associated deaths,it is important to maintain a high level of immunization coverage for the measles vaccine and to strengthen all the integral components of the national immunization program.

关键词： Subacute sclerosing panencephalitis Measles Myoclonus Electroencephalogram Cerebrospinal fluid

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Steady-state security in distribution networks with large wind farms

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Journal of Modern Power Systems and Clean Energy 2014年第2期2卷 134-142页

作者： Dilan JAYAWEERA syed ISLAM Curtin University PerthWA 6102Australia

Aging network assets,forced and unforced outages,and the way the networks are operated in a deregulated market are of significant concerns to integrate large wind farms in a distribution *** many cases,the constrained network capacity is a potential barrier to the large-scale integration of wind *** paper probabilistically assesses the steady-state security in a distribution network in the presence of large wind *** approach incorporates active distribution network operating conditions,including intermittent power outputs,random outages,demand fluctuations,and dynamic interactions and exchanges,and then assesses the steady state security using Monte Carlo simulation.A case study is performed by integrating large wind farms into a distribution *** results suggest that intermittent outputs of large wind farms in a distribution network can impact the steady-state security ***,the level of impact of wind farms does not necessarily correlate with the installed capacity of them.

关键词： Monte Carlo simulation Network integration capacity Random outages Security of supply Wind power generation

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Vertex-Edge Degree Based Indices of Honey Comb Derived Network

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Computer Systems Science & Engineering 2022年第1期40卷 247-258页

作者： Muhammad Ibrahim Sadia husain Nida Zahra Ali Ahmad Centre for Advanced Studies in Pure and Applied Mathematics Bahauddin Zakariya UniversityMultanPakistan College of Computer Sciences and Information Technology Jazan UniversityJazanSaudi Arabia

Chemical graph theory is a branch of mathematics which combines graph theory and *** reaction network theory is a territory of applied mathematics that endeavors to display the conduct of genuine compound *** pulled the research community due to its applications in theoretical and organic chemistry since ***,it also increases the interest the mathematicians due to the interesting mathematical structures and problems are *** structure of an interconnection network can be represented by a *** the network,vertices represent the processor nodes and edges represent the links between the processor *** invariants play a vital feature in graph theory and distinguish the structural properties of graphs and *** this paper,we determined the newly introduced topological indices namely,first ve-degree Zagreb?index,first ve-degree Zagreb?index,second ve-degree Zagreb index,ve-degree Randic index,ve-degree atom-bond connectivity index,ve-degree geometric-arithmetic index,ve-degree harmonic index and ve-degree sum-connectivity index for honey comb derived *** the analysis of the quantitative structure property relationships(QSPRs)and the quantitative structure-activity relationships(QSARs),graph invariants are important tools to approximate and predicate the properties of the biological and chemical ***,we give the numerical and graphical representation of our outcomes.

关键词： Honey comb derived network ev-degree topological indices

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Analytical Hybrid Particle Swarm Optimization Algorithm for Optimal Siting and Sizing of Distributed Generation in Smart Grid

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Journal of Modern Power Systems and Clean Energy 2020年第6期8卷 1221-1230页

作者： syed Muhammad Arif Akhtar Hussain Tek Tjing Lie syed Muhammad Ahsan Hassan Abbas Khan the Department of Electrical and Electronic Engineering Auckland University of TechnologyAucklandNew Zealand the Department of Electrical Engineering Incheon National UniversityIncheonKorea the Department of Electrical Engineering Lahore University of Management SciencesLahorePakistan

In this paper,the hybridization of standard particle swarm optimisation(PSO)with the analytical method(2/3 rd rule)is proposed,which is called as analytical hybrid PSO(AHPSO)algorithm used for the optimal siting and sizing of distribution *** proposed AHPSO algorithm is implemented to cater for uniformly distributed,increasingly distributed,centrally distributed,and randomly distributed loads in conventional power *** demonstrate the effectiveness of the proposed algorithm,the convergence speed and optimization performances of standard PSO and the proposed AHPSO algorithms are compared for two *** the first case,the performances of both the algorithms are compared for four different load distributions via an IEEE 10-bus *** the second case,the performances of both the algorithms are compared for IEEE 10-bus,IEEE 33-bus,IEEE 69-bus systems,and a real distribution system of *** results show that the proposed AHPSO algorithm converges significantly faster than the standard *** results of the proposed algorithm are compared with those of an analytical algorithm,and the results of them are similar.

关键词： Siting and sizing of distributed generation distribution system hybrid algorithm loss minimization particle swarm optimization(PSO)

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Adsorption Isotherm and Kinetic Study of Methane on Palm Kernel Shell-Derived Activated Carbon

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Journal of Bioresources and Bioproducts 2023年第1期8卷 66-77页

作者： Mohd Saufi Md Zaini Muhammad Arshad syed Shatir A.syed-Hassan School of Chemical Engineering College of EngineeringUniversiti Teknologi MARA Cawangan TerengganuKampus Bukit BesiDungun 23200Malaysia Department of Basic Science Jhang-Campus University of Veterinary and Animal ScienceLahore 35200Pakistan School of Chemical Engineering College of EngineeringUniversiti Teknologi MARAShah Alam 40450Malaysia

Activated carbon(AC)was synthesized from palm kernel shell(PKS)using different activating agents,i.e.,steam,carbon dioxide(CO 2),and CO 2-steam,in order to analyze the impact of acti-vating agents on the pore opening of *** this study,AC produced from PKS was found to have great potential as an adsorbent for methane *** different molecular diffusivity and reac-tivity of the combination of CO 2 and steam succeeded in producing AC with the highest burn-offof 78.57%,a surface area of 869.82 m 2/g,a total pore volume of 0.47 cm 3/g,and leading to maximum methane gas adsorption capacity of 4.500 mol/*** types of ACs exhibited the best fit with the Freundlich isotherm model,with the correlation coefficient(R 2)ranging from 0.997 to 0.999,indicating the formation of multilayer *** addition,the adsorption kinetic data for all ACs followed the pseudo-first-order model showing that the rate of adsorption was dependent on both the adsorbent and the adsorbate and was governed primarily by physical ad-sorption between the pore surface and methane *** results of intraparticle diffusion model indicated that the adsorption of methane was affected by both pore diffusion and exterior layer diffusion due to the different adsorption rates.

关键词： Palm kernel shell Activated carbon Methane adsorption Kinetic model Isotherm model

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