International Journal of Advances in Engineering Sciences and Applied Mathematics 

About: International Journal of Advances in Engineering Sciences and Applied Mathematics is an academic journal published by RG Education Society. The journal publishes majorly in the area(s): Finite element method & Engineering. It has an ISSN identifier of 0975-0770. Over the lifetime, 300 publications have been published receiving 1909 citations.

Challenges of porous media models in geo- and biomechanical engineering including electro-chemically active polymers and gels

Abstract: Miscible multi-component materials like classical mixtures as well as immiscible materials like saturated and partially saturated porous media can be successfully described on the common basis of the well-founded Theory of Mixtures (TM) or the Theory of Porous Media (TPM). In particular, both the TM and the TPM provide an excellent framework for a macroscopic description of a broad variety of applications ranging, for example, from standard and sophisticated problems in geomechanics via biomechanical applications to electro-chemically active polymers and gels, etc. The present article portrays general multiphasic and multi-component materials, thus reflecting their mechanical and their thermodynamical framework, while furthermore adding electro-chemical effects. Including some constitutive models and illustrative numerical examples, the article can be understood as a reference to theoretical and numerical investigations in the broad field of porous media models.

Computational fluid dynamic simulation of human carotid artery bifurcation based on anatomy and volumetric blood flow rate measured with magnetic resonance imaging

Abstract: Blood flow patterns and local hemodynamic parameters have been widely associated with the onset and progression of atherosclerosis in the carotid artery. Assessment of these parameters can be performed noninvasively using cine phase-contrast (PC) magnetic resonance imaging (MRI). In addition, in the last two decades, computational fluid dynamics (CFD) simulation in three dimensional models derived from anatomic medical images has been employed to investigate the blood flow in the carotid artery. This study developed a workflow of a subject-specific CFD analysis using MRI to enhance estimating hemodynamics of the carotid artery. Time-of-flight (TOF) MRI scans were used to construct three-dimensional computational models. PC-MRI measurements were utilized to impose the boundary condition at the inlet and a 0-dimensional lumped parameter model was employed for the outflow boundary condition. The choice of different viscosity models of blood flow as a source of uncertainty was studied, by means of the axial velocity, wall shear stress, and oscillatory shear index. The sequence of workflow in CFD analysis was optimized for a healthy subject using PC-MRI. Then, a patient with carotid artery stenosis and its hemodynamic parameters were examined. The simulations indicated that the lumped parameter model used at the outlet gives physiologically reasonable values of hemodynamic parameters. Moreover, the dependence of hemodynamics parameters on the viscosity models was observed to vary for different geometries. Other factors, however, may be required for a more accurate CFD analysis, such as the segmentation and smoothness of the geometrical model, mechanical properties of the artery's wall, and the prescribed velocity profile at the inlet.

Structural properties of rice husk ash concrete.

Abstract: This research was experimentally carried out to investigate the effects of introducing Rice Husk Ash (RHA) as a Partial Replacement of Ordinary Portland Cement (OPC) on the Structural Properties of Concrete. Rice Husk Ash which is an Agro-Waste and known to be a Super Pozzoland have been used for mass concrete and found to have compressive strength ranging from 33-38.4N/mm 2 at replacement percentages of 10-25% in a mix of 1:1.5:3. A further study was carried out on its flexural properties to determine their moduli of rupture as well as its tensile strength characteristics for the determination of cracking, the values obtained at 28days are 3, 2.5 and 2.4N/mm 2 while the tensile strength values are 1.94, 1.17 and 0.91N/mm 2 at replacement percentages of 10%, 20% and 25%. This research has proved that RHA Concrete can be used as a Structural Concrete at suitable replacement percentages. This research therefore is an investigation of the performance of the concrete made of partially replacing OPC with RHA on the structural integrity and properties of RHA concrete.

Spatial transferability of travel forecasting models: a review and synthesis

Abstract: This paper provides an extensive review of the literature on spatial transferability of travel forecasting models. From the review, a synthesis is prepared on: (1) the theoretical and practical considerations related to model transferability, (2) the approaches and metrics used to assess model transferability, (3) the methods used to transfer models, and (4) the empirical evidence on model transferability. Building on this review, an agenda is developed for future research focusing on how best to assess transferability and to enhance model transferability. Potentially fruitful avenues for further research are identified throughout the paper. Further, a detailed discussion is presented on the various aspects that need to be considered while assessing the transferability of activity-based travel demand model systems.

Upper concave envelopes and auxiliary random variables

Abstract: We propose a new characterization of inner and outer bounds of some network information theoretic regions in terms of upper concave envelopes of certain functions of mutual information. While this characterization is related to the characterization using auxiliary random variables, it is shown that the new characterization can make computations of boundary points much simpler. Further this representation also leads to some new kinds of factorization inequalities concerning information theoretic quantities. It also provides some new pathways into proving optimality of certain achievable rate regions.