bluuebunny/crossref_metadata_2025 huggingface dataset:
Radiative Effects on Mixed Convection in a Uniformly Heated Vertical Convergent Channel with an Unheated Moving Plate
Authors: Andreozzi Assunta , Bianco Nicola , Naso Vincenzo
Published: July 2016

Fluids engineering is extremely important in a wide variety of materials processing systems, such as soldering, welding, extrusion of plastics and other polymeric materials, Chemical Vapor Deposition (CVD), composite materials manufacturing. In particular, mixed convection due to moving surfaces is very important in these applications. Mixed convection in a channel, as a result of buoyancy and motion of one of its walls has received little research attention and few guidelines are available for choosing the best performing channel configuration, particularly when radiative effects are significant. In this study a numerical investigation of the effect of radiation on mixed convection in air due to the interaction between a buoyancy flow and an unheated moving plate induced flow in a uniformly heated convergent vertical channel is carried out. The moving plate has a constant velocity and moves in the buoyancy force direction. The principal walls of the channel
are heated at uniform heat flux. The numerical analysis is accomplished by means of the commercial code Fluent. The effects of the wall emissivity, the minimum channel spacing, the converging angle and the moving plate velocity are investigated and results in terms of air velocity and temperature fields inside the channel and wall temperature profiles, both of the moving and the heated plates, are given. Nusselt numbers, both accounting and not for the radiative contribution to heat removal, are also presented.
Heat Transfer, Knock Modeling and Cyclic Variability in a “Downsized” Spark-Ignition Turbocharged Engine
Authors: Bozza Fabio , Siano Daniela , Costa Michela
Published: July 2016

In the present paper a combined procedure for the quasi-dimensional modelling of heat transfer, combustion and knock phenomena in a “downsized” Spark Ignition two-cylinder turbocharged engine is presented. The procedure is extended to also include the effects consequent the Cyclic Variability. Heat transfer is modelled by means of a Finite Elements model. Combustion simulation is based on a fractal description of the flame front area. Cyclic Variability (CV) is characterized through the introduction of a random variation on a number of parameters controlling the rate of heat release (air/fuel ratio, initial flame kernel duration and radius, laminar flame speed, turbulence intensity). The intensity of the random variation is specified in order to realize a Coefficient Of Variation (COV) of the Indicated Mean Effective Pressure (IMEP) similar to the one measured during an experimental campaign. Moreover, the relative importance of the various concurring effects is established on the overall COV. A kinetic scheme is then solved within the unburned gas zone, characterized by different thermodynamic conditions occurring cycle-by-cycle. In this way, an optimal choice of the “knock-limited” spark advance is effected and compared with experimental data. Finally, the CV effects on the occurrence of individual knocking cycles are assessed and discussed.
High Level Languages Implementation and Analysis of 3D Navier-Stokes Solvers
Authors: Grazioso Valerio , Scalo Carlo , Felice Giuseppe de , Meola Carlo
Published: July 2016

In this work we introduce PRIN-3D (PRoto-code for Internal flows modeled by Navier-Stokes equations in 3-Dimensions), a new high level algebraic language (Matlab®) based code, by discussing some fundamental aspects regarding its basic solving kernel and by describing the design of an innovative advection scheme. The main focus was on designing a memory and computationally efficient code that, due to the typical conciseness of the Matlab coding language, could allow for fast and effective implementation of new models or algorithms. Innovative numerical methods are discussed in the paper. The pressure equation is derived with a quasi-segregation technique leading to an iterative scheme obtained within the framework of a global preconditioning procedure. Different levels of parallelization are obtainable by exploiting special pressure variable ordering patterns that lead to a block-structured Poisson-like matrix. Moreover, the new advection scheme has the potential of a controllable artificial diffusivity. Preliminary results are shown including a fully three-dimensional internal laminar flow evolving in a relatively complex geometry and a 3D methane-air flame simulated with the aid of libraries based on the Flamelet model.
Superconvergence of Mixed Methods for Optimal Control Problems Governed by Parabolic Equations
Authors: Xing Xiaoqing , Chen Yanping
Published: July 2016

In this paper, we investigate the superconvergence results for optimal control problems governed by parabolic equations with semidiscrete mixed finite element approximation. We use the lowest order mixed finite element spaces to discrete the state and costate variables while use piecewise constant function to discrete the control variable. Superconvergence estimates for both the state variable and its gradient variable are obtained.
Efficient Numerical Valuation of Continuous Installment Options
Authors: Mezentsev Anton , Pomelnikov Anton , Ehrhardt Matthias
Published: July 2016

In this work we investigate the novel Kryzhnyi method for the numerical inverse Laplace transformation and apply it to the pricing problem of continuous installment options. We compare the results with the one obtained using other classical methods for the inverse Laplace transformation, like the Euler summation method or the Gaver-Stehfest method.
Natural Convection of Temperature-Sensitive Magnetic Fluids in Porous Media
Authors: Roussellet Valentin , Niu Xiaodong , Yamaguchi Hiroshi , Magoulés Frédéric
Published: July 2016

In this article, natural convection of a temperature-sensitive magnetic
fluid in a porous media is studied numerically by using lattice Boltzmann method. Results show that the heat transfer decreases when the ball numbers increase. When the magnetic field is increased, the heat transfer is enhanced; however the average wall Nusselt number increases at small ball numbers but decreases at large ball numbers due to the induced flow being more likely confined near the bottom walls with a high number of obstacles.
Dependence Analysis of the Solutions on the Parameters of Fractional Delay Differential Equations
Authors: Yang Shuiping , Xiao Aiguo , Pan Xinyuan
Published: July 2016

In this paper, we investigate the dependence of the solutions on the parameters (order, initial function, right-hand function) of fractional delay differential equations (FDDEs) with the Caputo fractional derivative. Some results including an estimate of the solutions of FDDEs are given respectively. Theoretical results are verified by some numerical examples.
Convergence Analysis of the Spectral Methods for Weakly Singular Volterra Integro-Differential Equations with Smooth Solutions
Authors: Wei Yunxia , Chen Yanping
Published: July 2016

The theory of a class of spectral methods is extended to Volterra integro-differential equations which contain a weakly singular kernel (t - s)->* with 0< μ <1. In this work, we consider the case when the underlying solutions of weakly singular Volterra integro-differential equations are sufficiently smooth. We provide a rigorous error analysis for the spectral methods, which shows that both the errors of approximate solutions and the errors of approximate derivatives of the solutions decay exponentially inL°°-norm and weightedL2-norm. The numerical examples are given to illustrate the theoretical results.
Flow of Newtonian Fluid in Non-Uniform Tubes with Application to Renal Flow: A Numerical Study
Authors: Muthu P. , Berhane Tesfahun
Published: July 2016

In this paper, a numerical method employing a finite difference technique is used for an investigation of viscous, incompressible fluid flow in a tube with absorbing wall and slowly varying cross-section. The effect of fluid absorption through permeable wall is accounted by prescribing flux as a function of axial distance. The method is not restricted by the parameters in the problem such as wave number, permeability parameter, amplitude ratio and Reynolds number. The effects of these parameters on the radial velocity and mean pressure drop is studied and the results are presented graphically. Comparison is also made between the results obtained by perturbation method of solution and present approach.
The Pullback Asymptotic Behavior of the Solutions for 2D NonautonomousG-Navier-Stokes Equations
Authors: Jiang Jinping , Hou Yanren , Wang Xiaoxia
Published: July 2016

The pullback asymptotic behavior of the solutions for 2D Nonau-tonomousG-Navier-Stokes equations is studied, and the existence of itsL2-pullback attractors on some bounded domains with Dirichlet boundary conditions is investigated by using the measure of noncompactness. Then the estimation of the fractal dimensions for the 2DG-Navier-Stokes equations is given.
Contaminant Flow and Transport Simulation in Cracked Porous Media Using Locally Conservative Schemes
Authors: Song Pu , Sun Shuyu
Published: July 2016

The purpose of this paper is to analyze some features of contaminant flow passing through cracked porous medium, such as the influence of fracture network on the advection and diffusion of contaminant species, the impact of adsorption on the overall transport of contaminant wastes. In order to precisely describe the whole process, we firstly build the mathematical model to simulate this problem numerically. Taking into consideration of the characteristics of contaminant flow, we employ two partial differential equations to formulate the whole problem. One is flow equation; the other is reactive transport equation. The first equation is used to describe the total flow of contaminant wastes, which is based on Darcy law. The second one will characterize the adsorption, diffusion and convection behavior of contaminant species, which describes most features of contaminant flow we are interested in. After the construction of numerical model, we apply locally conservative and compatible algorithms to solve this mathematical model. Specifically, we apply Mixed Finite Element (MFE) method to the flow equation and Discontinuous Galerkin (DG) method for the transport equation. MFE has a good convergence rate and numerical accuracy for Darcy velocity. DG is more flexible and can be used to deal with irregular meshes, as well as little numerical diffusion. With these two numerical means, we investigate the sensitivity analysis of different features of contaminant flow in our model, such as diffusion, permeability and fracture density. In particular, we studyKdvalues which represent the distribution of contaminant wastes between the solid and liquid phases. We also make omparisons of two different schemes and discuss the advantages of both methods.
Convergence of Linear Multistep Methods and One-Leg Methods for Index-2 Differential-Algebraic Equations with a Variable Delay
Authors: Liu Hongliang , Xiao Aiguo
Published: July 2016

Linear multistep methods and one-leg methods are applied to a class of index-2 nonlinear differential-algebraic equations with a variable delay. The corresponding convergence results are obtained and successfully confirmed by some numerical examples. The results obtained in this work extend the corresponding ones in literature.
Variation of Parameters Method for Solving System of Nonlinear Volterra Integro-Differential Equations
Authors: Aslam Noor Muhammad , Inayat Noor Khalida , Waheed Asif , Al-Said Eisa
Published: July 2016

It is well known that nonlinear integro-differential equations play vital role in modeling of many physical processes, such as nano-hydrodynamics, drop wise condensation, oceanography, earthquake and wind ripple in desert. Inspired and motivated by these facts, we use the variation of parameters method for solving system of nonlinear Volterra integro-differential equations. The proposed technique is applied without any discretization, perturbation, transformation, restrictive assumptions and is free from Adomian’s polynomials. Several examples are given to verify the reliability and efficiency of the proposed technique.
The Multi-Step Differential Transform Method and Its Application to Determine the Solutions of Non-Linear Oscillators
Authors: Ertürk Vedat Suat , Odibat Zaid M. , Momani Shaher
Published: July 2016

In this paper, a reliable algorithm based on an adaptation of the standard differential transform method is presented, which is the multi-step differential transform method (MSDTM). The solutions of non-linear oscillators were obtained by MSDTM. Figurative comparisons between the MSDTM and the classical fourth-order Runge-Kutta method (RK4) reveal that the proposed technique is a promising tool to solve non-linear oscillators.
The Reflection of Magneto-ThermoelasticPandSVWaves at a Solid Half Space Using Dual-Phase-Lag Model
Authors: Abouelregal Ahmed E.
Published: July 2016

The dual-phase-lag heat transfer model is employed to study the reflection phenomena ofPandSVwaves from a surface of a semi-infinite magneto-thermoelastic solid. The ratios of reflection coefficients to that of incident coefficients are obtained forP-andSV-wave cases. The results for partition of the energy for various values of the angle of incidence are computed numerically under the stress-free and rigidly fixed thermally insulated boundaries. The reflection coefficients are depending on the angle of incidence, magnetic field, phase lags and other material constants. Results show that the sum of energy ratios is unity at the interface. The results are discussed and depicted graphically.
Closed-Form Expression for the Exact Period of a Nonlinear Oscillator Typified by a Mass Attached to a Stretched Wire
Authors: Mamode Malik
Published: July 2016

The exact analytical expression of the period of a conservative nonlinear oscillator with a non-polynomial potential, is obtained. Such an oscillatory system corresponds to the transverse vibration of a particle attached to the center of a stretched elastic wire. The result is given in terms of elliptic functions and validates the approximate formulae derived from various approximation procedures as the harmonic balance method and the rational harmonic balance method usually implemented for solving such a nonlinear problem.
A Consistent Characteristic Boundary Condition for General Fluid Mixture and Its Implementation in a Preconditioning Scheme
Authors: Li Hua-Guang , Zong Nan , Lu Xi-Yun , Yang Vigor
Published: July 2016

Characteristic boundary conditions that are capable of handling general fluid mixtures flow at all flow speeds are developed. The formulation is based on fundamental thermodynamics theories incorporated into an efficient preconditioning scheme in a unified manner. Local one-dimensional inviscid (LODI) relations compatible to the preconditioning system are proposed to obtain information carried by incoming characteristic waves at boundaries accurately. The approach has been validated against a variety of sample problems at a broad range of fluid states and flow speeds. Both acoustic waves and hydrodynamic flow features can pass through the boundaries of computational domain transparently without any un-physical reflection or spurious distortion. The approach can be reliably applied to fluid flows at extensive thermodynamic states and flow speeds in numerical simulations. Moreover, the use of the boundary condition shows to improve the computational efficiency.
Multi-Symplectic Wavelet Collocation Method for Maxwell’s Equations
Authors: Zhu Huajun , Song Songhe , Chen Yaming
Published: July 2016

In this paper, we develop a multi-symplectic wavelet collocation method for three-dimensional (3-D) Maxwell’s equations. For the multi-symplectic formulation of the equations, wavelet collocation method based on autocorrelation functions is applied for spatial discretization and appropriate symplectic scheme is employed for time integration. Theoretical analysis shows that the proposed method is multi-symplectic, unconditionally stable and energy-preserving under periodic boundary conditions. The numerical dispersion relation is investigated. Combined with splitting scheme, an explicit splitting symplectic wavelet collocation method is also constructed. Numerical experiments illustrate that the proposed methods are efficient, have high spatial accuracy and can preserve energy conservation laws exactly.
Generating Function Methods for Coefficient-Varying Generalized Hamiltonian Systems
Authors: Li Xueyang , Xiao Aiguo , Wang Dongling
Published: July 2016

The generating function methods have been applied successfully to generalized Hamiltonian systems with constant or invertible Poisson-structure matrices. In this paper, we extend these results and present the generating function methods preserving the Poisson structures for generalized Hamiltonian systems with general variable Poisson-structure matrices. In particular, some obtained Poisson schemes are applied efficiently to some dynamical systems which can be written into generalized Hamiltonian systems (such as generalized Lotka-Volterra systems, Robbins equations and so on).
Two-Grid Discretization Scheme for Nonlinear Reaction Diffusion Equation by Mixed Finite Element Methods
Authors: Chen Luoping , Chen Yanping
Published: July 2016

In this paper, we study an efficient scheme for nonlinear reaction-diffusion equations discretized by mixed finite element methods. We mainly concern the case when pressure coefficients and source terms are nonlinear. To linearize the nonlinear mixed equations, we use the two-grid algorithm. We first solve the nonlinear equations on the coarse grid, then, on the fine mesh, we solve a linearized problem using Newton iteration once. It is shown that the algorithm can achieve asymptotically optimal approximation as long as the mesh sizes satisfyH=O(h1/2). As a result, solving such a large class of nonlinear equations will not be much more difficult than getting solutions of one linearized system.
Analysis of Functionally Graded Piezoelectric Cylinders in a Hygrothermal Environment
Authors: Allam M. N. M. , Zenkour A. M. , Tantawy R.
Published: July 2016

This paper presents an analytical solution for the interaction of electric potentials, electric displacement, elastic deformations, and describes hygrothermal effect responses in hollow and solid cylinders, subjected to mechanical load and electric potential. Exact solutions for displacement, stresses and electric potentials in functionally graded piezoelectric material are determined using the infinitesimal theory. The material properties coefficients of the present cylinder are assumed to be graded in the radial direction by a power law distribution. Numerical examples display the significant of influence of material inhomogeneity. It is interesting to note that selecting a specific value of inhomogeneity parameter can optimize the piezoelectric hollow and solid cylinders responses, which will be of particular importance in modern engineering designs.
On the Computations of Gas-Solid Mixture Two-Phase Flow
Authors: Zeidan D. , Touma R.
Published: July 2016

This paper presents high-resolution computations of a two-phase gas-solid mixture using a well-defined mathematical model. The HLL Riemann solver is applied to solve the Riemann problem for the model equations. This solution is then employed in the construction of upwind Godunov methods to solve the general initial-boundary value problem for the two-phase gas-solid mixture. Several representative test cases have been carried out and numerical solutions are provided in comparison with existing numerical results. To demonstrate the robustness, effectiveness and capability of these methods, the model results are compared with reference solutions. In addition to that, these results are compared with the results of other simulations carried out for the same set of test cases using other numerical methods available in the literature. The diverse comparisons demonstrate that both the model equations and the numerical methods are clear in mathematical and physical concepts for two-phase fluid flow problems.
A Fifth-Order Low-Dissipative Conservative Upwind Compact Scheme Using Centered Stencil
Authors: Wu Conghai , Yang Sujuan , Zhao Ning
Published: July 2016

In this paper, a conservative fifth-order upwind compact scheme using centered stencil is introduced. This scheme uses asymmetric coefficients to achieve the upwind property since the stencil is symmetric. Theoretical analysis shows that the proposed scheme is low-dissipative and has a relatively large stability range. To maintain the convergence rate of the whole spatial discretization, a proper non-periodic boundary scheme is also proposed. A detailed analysis shows that the spatial discretization implemented with the boundary scheme proposed by Pirozzoli [J. Comput. Phys., 178 (2001), pp. 81–117] is approximately fourth-order. Furthermore, a hybrid methodology, coupling the compact scheme with WENO scheme, is adopted for problems with discontinuities. Numerical results demonstrate the effectiveness of the proposed scheme.
Lattice Boltzmann Study of Non-Newtonian Blood Flow in Mother and Daughter Aneurysm and a Novel Stent Treatment
Authors: Shi Y. , Tang G. H. , Tao W. Q.
Published: July 2016

Understanding blood flow in human body’s cerebral arterial system is of both fundamental and practical significance for prevention and treatment of vascular diseases. The mechanism and treatment for the growth of daughter aneurysm on its mother aneurysm are not yet fully understood. Themain purpose of the present paper is to elucidate the relationships between hemodynamics and the genesis, growth, subsequent rupture of the mother and daughter aneurysm on the cerebral vascular. The intensified stents with different porosities and structures are investigated to reduce the wall shear stress and pressure of mother and daughter aneurysm. The simulation is based on a lattice Boltzmann modeling of non-Newtonian blood flow. A novel stent structurewith “dense in front and sparse in rear” is proposed,which is verified to have good potential to reduce the wall shear stress of both mother and daughter aneurysm. The simulation is based on a lattice Boltzmann modeling of non-Newtonian blood flow. A novel stent structurewith “dense in front and sparse in rear” is proposed,which is verified to have good potential to reduce the wall shear stress of both mother and daughter aneurysm.
Two-Scale Picard Stabilized Finite Volume Method for the Incompressible Flow
Authors: Yang Jianhong , Lei Gang , Yang Jianwei
Published: July 2016

In this paper, we consider a two-scale stabilized finite volume method for the two-dimensional stationary incompressible flow approximated by the lowest equal-order element pairP1—P1which do not satisfy the inf-sup condition. The two-scale method consist of solving a small non-linear system on the coarse mesh and then solving a linear Stokes equations on the fine mesh. Convergence of the optimal order in theH1-norm for velocity and theL2-norm for pressure are obtained. The error analysis shows there is the same convergence rate between the two-scale stabilized finite volume solution and the usual stabilized finite volume solution on a fine mesh with relationh = 𝾪(H2). Numerical experiments completely confirm theoretic results. Therefore, this method presented in this paper is of practical importance in scientific computation.
Numerical Simulation of Deflagration to Detonation Transition in a Straight Duct: Effects of Energy Release and Detonation Stability
Authors: Dou Hua-Shu , Hu Zongmin , Khoo Boo Cheong , Jiang Zonglin
Published: July 2016

Numerical simulation based on the Euler equation and one-step reaction model is carried out to investigate the process of deflagration to detonation transition (DDT) occurring in a straight duct. The numerical method used includes a high resolution fifth-order weighted essentially non-oscillatory (WENO) scheme for spatial discretization, coupled with a third order total variation diminishing Runge-Kutta time stepping method. In particular, effect of energy release on the DDT process is studied. The model parameters used are the heat release atq= 50,30,25,20,15,10 and 5, the specific heat ratio at 1.2, and the activation temperature atTi= 15, respectively. For all the cases, the initial energy in the spark is about the same compared to the detonation energy at the Chapman-Jouguet (CJ) state. It is found from the simulation that the DDT occurrence strongly depends on the magnitude of the energy release. The run-up distance of DDT occurrence decreases with the increase of the energy release forq= 50 ~ 20, and increases with the increase of the energy release forq= 20 ~ 5. This phenomenon is found to be in agreement with the analysis of mathematical stability theory. It is suggested that the factors to strengthen the DDT would make the detonation more stable, and vice versa. Finally, it is concluded from the simulations that the interaction of the shock wave and the flame front is the main reason for leading to DDT.
An Efficient Dynamic Mesh Generation Method for Complex Multi-Block Structured Grid
Authors: Ding Li , Lu Zhiliang , Guo Tongqing
Published: July 2016

Aiming at a complex multi-block structured grid, an efficient dynamic mesh generation method is presented in this paper, which is based on radial basis functions (RBFs) and transfinite interpolation (TFI). When the object is moving, the multi-block structured grid would be changed. The fast mesh deformation is critical for numerical simulation. In this work, the dynamic mesh deformation is completed in two steps. At first, we select all block vertexes with known deformation as center points, and apply RBFs interpolation to get the grid deformation on block edges. Then, an arc-length-based TFI is employed to efficiently calculate the grid deformation on block faces and inside each block. The present approach can be well applied to both two-dimensional (2D) and three-dimensional (3D) problems. Numerical results show that the dynamic meshes for all test cases can be generated in an accurate and efficient manner.
Large Eddy Simulation of a Vortex Ring Impacting a Bump
Authors: Ren Heng , Zhao Ning , Lu Xi-Yun
Published: July 2016

A vortex ring impacting a three-dimensional bump is studied using large eddy simulation for a Reynolds number Re = 4 × 104 based on the initial diameter and translational speed of the vortex ring. The effects of bump height and vortex core thickness for thin and thick vortex rings on the vortical flow phenomena and the underlying physical mechanisms are investigated. Based on the analysis of the evolution of vortical structures, two typical kinds of vortical structures, i.e., the wrapping vortices and the hair-pin vortices, are identified and play an important role in the flow state evolution. The boundary vorticity flux is analyzed to reveal the mechanism of the vorticity generation on the bump surface. The circulation of the primary vortex ring reasonably elucidates some typical phases of flow evolution. Further, the analysis of turbulent kinetic energy reveals the transition from laminar to turbulent state. The results obtained in this study provide physical insight into the understanding of the mechanisms relevant to the flow evolution and the flow transition to turbulent state.
Simulation of Vortex Convection in a Compressible Viscous Flow with Dynamic Mesh Adaptation
Authors: Zhou C. H.
Published: July 2016

In this work, vortex convection is simulated using a dynamic mesh adaptation procedure. In each adaptation period, the mesh is refined in the regions where the phenomena evolve and is coarsened in the regions where the phenomena deviate since the last adaptation. A simple indicator of mesh adaptation that accounts for the solution progression is defined. The generation of dynamic adaptive meshes is based on multilevel refinement/coarsening. The efficiency and accuracy of the present procedure are validated by simulating vortex convection in a uniform flow. Two unsteady compressible turbulent flows involving blade-vortex interactions are investigated to demonstrate further the applicability of the procedure. Computed results agree well with the published experimental data or numerical results.
Topology Optimization of the Caudal Fin of the Three-Dimensional Self-Propelled Swimming Fish
Authors: Xin Zhiqiang , Wu Chuijie
Published: July 2016

Based on the boundary vorticity-flux theory, topology optimization of the caudal fin of the three-dimensional self-propelled swimming fish is investigated by combining unsteady computational fluid dynamics with moving boundary and topology optimization algorithms in this study. The objective functional of topology optimization is the function of swimming efficiency, swimming speed and motion direction control. The optimal caudal fin, whose topology is different from that of the natural fish caudal fin, make the 3D bionic fish achieve higher swimming efficiency, faster swimming speed and better maneuverability. The boundary vorticity-flux on the body surface of the 3D fish before and after optimization reveals the mechanism of high performance swimming of the topology optimization bionic fish. The comparative analysis between the swimming performance of the 3D topology optimization bionic fish and the 3D lunate tail bionic fish is also carried out, and the wake structures of two types of bionic fish show the physical nature that the swimming performance of the 3D topology optimization bionic fish is significantly better than the 3D lunate tail bionic fish.
A Numerical Study of Jet Propulsion of an Oblate Jellyfish Using a Momentum Exchange-Based Immersed Boundary-Lattice Boltzmann Method
Authors: Yuan Hai-Zhuan , Shu Shi , Niu Xiao-Dong , Li Mingjun , Hu Yang
Published: July 2016

In present paper, the locomotion of an oblate jellyfish is numerically investigated by using a momentum exchange-based immersed boundary-Lattice Boltzmann method based on a dynamic model describing the oblate jellyfish. The present investigation is agreed fairly well with the previous experimental works. The Reynolds number and the mass density of the jellyfish are found to have significant effects on the locomotion of the oblate jellyfish. Increasing Reynolds number, the motion frequency of the jellyfish becomes slow due to the reduced work done for the pulsations, and decreases and increases before and after the mass density ratio of the jellyfish to the carried fluid is 0.1. The total work increases rapidly at small mass density ratios and slowly increases to a constant value at large mass density ratio. Moreover, as mass density ratio increases, the maximum forward velocity significantly reduces in the contraction stage, while the minimum forward velocity increases in the relaxation stage.
Numerical Study of Geometric Multigrid Methods on CPU-GPU Heterogeneous Computers
Authors: Feng Chunsheng , Shu Shi , Xu Jinchao , Zhang Chen-Song
Published: July 2016

The geometric multigrid method (GMG) is one of the most efficient solving techniques for discrete algebraic systems arising from elliptic partial differential equations. GMG utilizes a hierarchy of grids or discretizations and reduces the error at a number of frequencies simultaneously. Graphics processing units (GPUs) have recently burst onto the scientific computing scene as a technology that has yielded substantial performance and energy-efficiency improvements. A central challenge in implementing GMG on GPUs, though, is that computational work on coarse levels cannot fully utilize the capacity of a GPU. In this work, we perform numerical studies of GMG on CPU-GPU heterogeneous computers. Furthermore, we compare our implementation with an efficient CPU implementation of GMG and with the most popular fast Poisson solver, Fast Fourier Transform, in the cuFFT library developed by NVIDIA.
Axisymmetric Stagnation-Point Flow of Nanofluid Over a Stretching Surface
Authors: Nawaz M. , Hayat T.
Published: July 2016

This paper investigates the laminar boundary layer flow of nanofluid induced by a radially stretching sheet. Nanofluid model exhibiting Brownian motion and thermophoresis is used. Series solutions for a reduced system of nonlinear ordinary differential equations are obtained by homotopy analysis method (HAM). Comparative study between the HAM solutions and previously published numerical results shows an excellent agreement. Velocity, temperature and mass fraction are displayed for various values of parameters. The local skin friction coefficient, the local Nusselt number and the local Sherwood number are computed. It is observed that the presence of nanoparticles enhances the thermal conductivity of base fluid. It is found that the convective heat transfer coefficient (Nusselt number) is decreased with an increase in concentration of nanoparticles whereas Sherwood number increases when concentration of nanoparticles in the base fluid is increased.
Use of Text Searching for Trigger Words in Medical Records to Identify Adverse Drug Reactions within an Intensive Care Unit Discharge Summary
Authors: MacLasco Adam , Saul Melissa , Smith Tiffany R. , Kloet Megan , Kim Catherine , Anthes Ananth , Smithburger Pamela , Seybert Amy , Kane-Gill Sandra
Published: July 2016

To evaluate the performance of using trigger words (e.g. clues to an adverse drug reaction) in unstructured, narrative text to detect adverse drug reactions (ADRs) and compare the use of these trigger words to a targeted chart review for ADR detection within the intensive care unit (ICU) discharge summary note.

A retrospective medical record review was conducted. Evaluation of ADRs occurred in two phases – targeted chart review of the ICU discharge summary notes in Phase 1 and targeted chart review using specific words and phrases as triggers for ADRs in Phase 2.

Four hundred ADRs were documented in 223 patients for Phase 1. For Phase 2, there were 219 ADRs identified in 120 patients. 138 real or accurate ADRs were identified from Phase 1 and 47 duplicate events. 34 ADRs from Phase 2 were not identified in Phase 1. Fifteen of the ADRs were inaccurately presumed in Phase 2. Fifty-eight of 127 text triggers identified at least one ADR. Low and moderate frequency trigger words were more likely to have PPVs > 5%.

Targeted chart review using specific words and phrases as triggers for ADRs is a reasonable approach to identify ADRs and may save time compared to other methods after further refinement leads to a more accurately performing trigger word list.

Citation: Kane-Gill SL, MacLasco AM, Saul MI, Politz Smith TR, Kloet MA, Kim C, Anthes AM, Smithburger PL, Seybert AL. Use of text searching for trigger words in medical records to identify adverse drug reactions within an intensive care unit discharge summary.
A Mathematical Programming Model for Tactical Planning with Set-up Continuity in a Two-stage Ceramic Firm
Authors: Pérez Perales David , Alemany M.M. Eva
Published: July 2016

It is known that capacity issues in tactical production plans in a hierarchical context are relevant since its inaccurate determination may lead to unrealistic or simply non-feasible plans at the operational level. Semi-continuous industrial processes, such as ceramic ones, often imply large setups and their consideration is crucial for accurate capacity estimation. However, in most of production planning models developed in a hierarchical context at this tactical (aggregated) level, setup changes are not explicitly considered. Their consideration includes not only decisions about lot sizing of production, but also allocation, known as Capacitated Lot Sizing and Loading Problem (CLSLP). However, CLSLP does not account for set-up continuity, specially important in contexts with lengthy and costly set-ups and where product families minimum run length are similar to planning periods. In this work, a mixed integer linear programming (MILP) model for a two stage ceramic firm which accounts for lot sizing and loading decisions including minimum lot-sizes and set-up continuity between two consecutive periods is proposed. Set-up continuity inclusion is modelled just considering which product families are produced at the beginning and at the end of each period of time, and not the complete sequence. The model is solved over a simplified two-stage real-case within a Spanish ceramic firm. Obtained results confirm its validity.
New Preclinical Data – the Case for Ialuril®
Authors: Salonia Andrea
Published: July 2016

This article briefly summarises data published over the last decade which have investigated the concept that intravesical instillation of glycosaminoglycans (GAGs) hyaluronic acid and chondroitin sulfate is able to restore the GAG layer and provide a beneficial effect in protecting the bladder. In the second half of this article, pre-clinical studies which assess the effectiveness of intravesical instillation of Ialuril® after chemical or electromechanical damage to the rat bladder wall are described.
POTENCIAL DE APROVEITAMENTO DE RESÍDUOS SÓLIDOS EM UM CAMPUS UNIVERSITÁRIO
Authors: Dombroski Solange Aparecida Goularte , Diodato Marco Antonio , Batista Rafael Oliveira , Coelho Daniela da Costa Leite , Silva Jackson Fernandes da
Published: July 2016

Este trabalho teve por objetivo avaliar o aproveitamento potencial deresíduos sólidos gerados em um campus universitário, de modo a subsidiaro planejamento e ações de gerenciamento. O estudo foi realizado naUniversidade Federal Rural do Semi-Árido (UFERSA), Campus Mossoró,Rio Grande do Norte, durante quatro anos consecutivos com amostragensdurante o período letivo de aulas. Os dados foram submetidos à análisede variância e ao teste de média. A partir do agrupamento das 18 classesadotadas de resíduos em 4 grandes grupos (recicláveis, restos de alimentos,material potencialmente perigoso e outros 3), verificou‑se que nenhumgrande grupo diferiu estatisticamente entre si para os distintos dias dasemana e que as maiores proporções (48,9 e 55,1%) foram observadaspara o grande grupo de recicláveis. A análise anual indicou, para os doisúltimos anos do estudo, maiores proporções também para o grande grupode recicláveis, evidenciando a importância de implantação de coleta seletivasolidária eficiente na instituição.
DEGRADAÇÃO AMBIENTAL NO MUNICÍPIO DE PARARI-PB: UMA ANÁLISE POR MEIO DE SENSORIAMENTO REMOTO
Authors: Silva Glauciene Justino Ferreira da , Almeida Nadjacleia Vilar
Published: July 2016

A exploração não sustentada da cobertura vegetal, dos recursos hídricos e do solo em uma região traz sérias implicações à manutenção do equilíbrio ambiental. Em regiões semiáridas, por exemplo, a degradação das terras provoca o assoreamento dos rios, interfere nas propriedades físico-químicas dos solos e afeta a biodiversidade, modificando a paisagem. Para o monitoramento mais eficiente das alterações e o planejamento adequado no combate à destruição do bioma Caatinga é necessário o monitoramento da degradação. Nesse contexto, esse trabalho tem como objetivo quantificar a degradação da cobertura vegetal no município de Pararí-PB, fornecendo subsídios para analisar e caracterizar a dinâmica da vegetação de caatinga existente na área. Foram utilizados como suporte metodológico o Sensoriamento Remoto, o SIG e técnicas de análise espacial.  A quantificação da cobertura das terras mostrou que a classe solo exposto em 1988 e 1999 representava, respectivamente, 89,54% e 80,59% da área total do município. Em detrimento da vegetação densa que em todo período representou os menores percentuais em relação à área de estudo. O NDVI variou de -1 e 0,40, sendo influenciado pela resposta da vegetação a precipitação nos meses considerados chuvosos e secos, o que afetou significativamente a resposta desse índice para a área em estudo. Devido ao desmatamento, as áreas mais degradadas no município, apresentam solos com alto nível de desgaste que impossibilita o desenvolvimento da vegetação de caatinga densa, a umidade proporcionada pela precipitação não altera a paisagem das áreas degradadas.
INDUSTRIALIZAÇÃO DO MUNICÍPIO DE LONDRINA-PR: PROCESSO INICIAL E TRANSFORMAÇÕES RECENTES
Authors: Saab Thiago Bueno , Bragueto Cláudio Roberto
Published: July 2016

O município de Londrina, situado no norte do  Paraná, é o segundo mais populoso do estado. Apresentou um crescimento importante do setor industrial a partir dos anos de 1990, porém, poucos estudos trataram desta temática. O  presente artigo verifica a industrialização do município de Londrina durante o período compreendido entre os anos de 1992 a2011, tendo ainda os seguintes objetivos específicos: analisar a dinâmica industrial londrinense; evidenciar quais são os ramos industriais mais relevantes e efetuar um breve relato sobre a construção histórica da industrialização em Londrina. Também foi realizada uma classifcação metodológica dos níveis de intensidade tecnológica, a qual resultou na agrupação dos ramos industriais em dois grupos: os de menor e os de maior intensidade tecnológica. A metodologia utilizada pautou-se na busca por bibliografias de cunho teórico-conceituais, em especial sobre a reestruturação produtiva recente e sobre a industrialização de Londrina. Os dados sobre estabelecimentos, número de pessoal ocupado e valor adicionado foram obtidos de consultas a bancos de dados do Instituto Paranaense de Desenvolvimento Econômico e Social (IPARDES) e da Relação Anual de Informações Sociais (RAIS), a qual tem vínculo com o Ministério do Trabalho e Emprego. Como resultado, fica claro que Londrina tem, desde 1990, um efetivo crescimento industrial, concentrado principalmente nos ramos de menor intensidade tecnológica. Este crescimento ocorreu principalmente em função das condições gerais de produção estabelecidas historicamente, uma vez que o principal instrumento de atração de investimentos adotado pelo estado do Paraná, no período, apresentou um número reduzido de empresas instaladas no município.
INDUSTRIALIZAÇÃO E URBANIZAÇÃO NO CENTENÁRIO DE PASSO FUNDO/RS – 1957
Authors: Knack Eduardo Roberto Jordão
Published: July 2016

O presente trabalho objetiva analisar as relações entre industrialização e urbanização em Passo Fundo, Rio Grande do Sul, durante as comemorações do centenário do município em 1957. A partir da construção do imaginário da cidade como uma capital do planalto médio rio-grandense, o grupo no poder durante a década de 1950 buscou a legitimação de um projeto político e econômico que passou a orientar as ações do poder público até a primeira década de século XXI. Dessa forma, é preciso discutir e elucidar as relações entre o desenvolvimento econômico e o campo do imaginário para investigar a historicidade das visões e projetos para o futuro da cidade que marcaram seu centenário, bem como para entender as consequências desse processo para economia não apenas de Passo Fundo, mas da região norte do estado. A defesa de uma industrialização baseada na produção de implementos agrícolas associada a um intenso êxodo rural provocado pela mecanização do campo trouxe significativas mudanças para o mundo urbano, marcando uma redefinição no traçado da cidade, a formação de bairros operários e populares que atestavam a falta de estrutura do município para absorver um grande contingente populacional em um curto período. Além de solucionar esses problemas, era preciso justificar as propostas, nesse sentido, a celebração dos cem anos foi um momento propício para isso, onde políticas públicas, projetos para economia municipal e afirmação de um imaginário coincidiram sob a orientação do poder público.
ENTREVISTA COM O PROF. PAULO PINHEIRO MACHADO
Authors: Florentino Luiz Felipe
Published: July 2016

Nesta entrevista o prof. Paulo Pinheiro Machado responde questões relacionadas a doscência, a história do campesinato e Contestado, ditadura militar brasileira e alguns aspectos da política brasileira atual.
Sobre pessoa e referencialidade no português
Authors: Carvalho Danniel Da Silva
Published: July 2016

O objetivo deste trabalho é discutir o comportamento da 1ª pessoa do singular no português a partir de dados de primeira pessoa do singular não marcada no português brasileiro (PB) encontradas em dados do português afro-brasileiro coletados na comunidade de Helvécia, Bahia e Muquém, Alagoas. O trabalho parte da análise de Brito e Carvalho (2014), que relacionam a estrutura de pro ao mecanismo de licenciamento que torna possível que, ainda que a morfologia de primeira pessoa do singular não esteja presente na flexão verbal, esta seja a referência recuperada por pro, uma vez que, segundo Rizzi (1986), pro deve ser identificado e, para tanto, herda os traços phi do licenciador.  Esta análise é, então, reinterpretada a partir da noção de relativização de traços, proposta inicialmente por Preminger (2014), assumindo-se um mecanismo de concordância também relativizado.
Análise do clima organizacional: um estudo multicaso em empresas do Estado do Paraná
Authors: Bernardino Jean Francisco , Silva Helena Helena de Fátima Nunes , Queiroz Fernanda Cristina Barbosa Pereira
Published: July 2016

A compreensão do clima organizacional pode auxiliar na gestão das estratégias que orientam as intervenções e mudanças necessárias ao crescimento e desenvolvimento das organizações. Este artigo tem como objetivo analisar as informações a respeito do clima organizacional de três empresas paranaenses, de diferentes ramos de atividades, denominadas A, B e C. A Empresa A fornece serviços e tecnologias para uma instituição bancária, a Empresa B realiza serviços essenciais em um município, como limpeza pública e a Empresa C atua na área de transporte de grãos. Para a coleta de dados utilizou-se um questionário estruturado, contendo 22 questões objetivas, abrangendo as seguintes variáveis: avaliação da supervisão, avaliação do salário, avaliação do desenvolvimento profissional, avaliação do feedback e avaliação do trabalho em si (nível de estresse dos funcionários). Os resultados encontrados indicam que as Empresas A e B estão dentro do padrão de clima organizacional considerado regular e a Empresa C pode ser enquadrada como um clima ruim.  Conclui-se que há similaridade entre as empresas em alguns quesitos, que estão relacionados ao negócio, estrutura e estratégia organizacional.
Design de joias com matéria-prima brasileira e conceito art nouveau
Authors: Ledel Fabiane Lima , Lisboa Maria da Graça Portella , Bisognin Edir Lúcia
Published: July 2016

O projeto proposto, inspirado no estilo Art Nouveau, apresenta a criação de uma coleção de joias em que as peças das linhas: Lé Metropolitain, Petit Palais e Villa Majorelle remetem aos elementos arquitetônicos e do mobiliário urbano da época. Em que os elementos orgânicos e as formas assimétricas foram adaptados a tendência de mercado atual, visando, assim, atender o público feminino. O metal foi o material escolhido como base para a criação da coleção, pois remete ao ferro forjado, utilizado nas obras de referência. Outros temas importantes abordados no decorrer do texto são a valorização da matéria-prima nacional, como as gemas e o capim dourado, bem como a questão ambiental relacionada aos processos de produção e os aspectos simbólicos valorizados na estética contemporânea.
Expediente da edição v.3, n.4, 2015.
Authors: Freitas Maria do Carmo Duarte , Botelho-Francisco Rodrigo Eduardo , Odorczyk Ricardo Siebenrok
Published: July 2016

Informações sobre os pesquisadores e colaboradores que atuaram na produção da edição v.3, n.4, 2015.