We present a modeling approach to determine the permeability-selectivity tradeoff for microfiltration and ultrafiltration membranes with distribution of pore sizes shapes. Using formulated model, effect aspect ratio size on membrane is analyzed. A finite element model developed study stretching shapes in stretched membrane. The also results show that increasing improves performance while width deteriorates performance. It was found greatly affected by uniformity Stretching showed positive...

The release of large quantities CO2 into the atmosphere is one major causes global warming. most viable method to control level in capture and permanently sequestrate excess amount subsurface geological reservoirs. injection gives rise pore pressure buildup. It crucial monitor rising order prevent potential failure reservoir subsequent leakage stored overburden layers, then back atmosphere. In this paper, Minjur sandstone eastern Saudi Arabia was considered for establishing a coupled...

Several approaches have been used in the past to predict fatigue crack growth rates T-joints of offshore structures, but there are relatively few cases applying structural health monitoring during non-destructive testing jacket platforms. This paper presents an experimental method based on sensing piezoelectric sensors and finite element analysis for studying cracks steel structure. Three types joints selected current research work: T-type plate, tube-plate, tube joints. The model...

Drillstring vibration is one of the major causes for a deteriorated drilling performance, and if left untreated may result in complete failure process. Although variations load, stick-slip, whirling are known to be primary severe vibrations, they often give rise excessive flexural deformations subsequent string—borehole interaction. contact-impact interaction with borehole results high-frequency excitations, which further deteriorate cause damage bottomhole assembly. Modelling impact crucial...

Treated herein is an elastic beam that subjected to a constant load travels continuously (back and forth) along its span. The dynamic deflection of the investigated analytically so as predict critical cancellation speeds. Closed-form solutions are obtained for damped system each condition superimposed determine total solution response. Unlike classical case traveling at speed in one direction, multiple resonance peaks observed reciprocating speeds lower than speed. It also may not exist...

This paper deals with the in‐plane vibration of circular annular disks under combinations different boundary conditions at inner and outer edges. The free an elastic isotropic disk is studied on basis two‐dimensional linear plane stress theory elasticity. exact solution equation equilibrium attainable, in terms Bessel functions, for uniform conditions. frequency equations modes can be obtained from general solutions by applying appropriate presented provide parameters required number a wide...

Many methods have been used in the past two decades to detect crack damage steel joints of offshore structures, but electromechanical impedance (EMI) method is a comparatively recent non-destructive that can be for quality monitoring weld structural joints. The EMI ensures direct assessment, analysis and particularly recognition dynamics by acquiring its EM admittance signatures. This research paper first briefly introduces theoretical background method, followed carrying out experimental...

In-plane free vibrations of an elastic and isotropic annular disk with constraints at the inner outer boundaries, which are applied either along entire periphery or a point investigated. The boundary characteristic orthogonal polynomials employed in Rayleigh-Ritz method to obtain frequency parameters associated mode shapes. Boundary generated for conditions while artificial springs used account different conditions. edge evaluated compared those available published studies computed from...

Background: Nanomanipulation techniques have gone through several phases to be used in scientific explorations not only reveal more characteristics of nano, micro and mesoscopic phenomena but also build functional nano-devices useful for specific applications. The nano-manipulator becomes a key instrument technology bridging between sub-nano mesoscale. recent patents exhibited integration various functions the requiring sub-nanometer precision highly stable manipulator with substantial...

Purpose Novel nanomaterials and nano-devices require further functional aspects that can be designed supported using new nanomanipulation techniques allowing specific functions at the design phase. The nano-manipulator becomes a key instrument for technology bridging sub-nano to mesoscale. integration of various operations in requires sub-nanometer precision highly stable manipulator. This paper aims review concepts recent nanomanipulators, their motion characteristics, basic functions,...

In-plane freevibrations of an elasticand isotropic annular disk withelasticconstraints at theinner and outer boundaries, whichareappliedeither alongtheentireperipheryof thediskorat apoint areinvestigated. Theboundary characteristicorthogonal polynomials are employed in the Rayleigh-Ritz method to obtain frequency parameters associated mode shapes. Boundary characteristic orthogonal generated for free boundary conditions while artificial springs used account different conditions. The edge...

Carbon fiber-based materials possess excellent mechanical properties and show linear piezoresistive behavior, which make them good candidate for strain measurements. They have the potential to be used as sensors various applications such damage detection, stress analysis monitoring of manufacturing processes quality. In this paper, carbon fiber are prepared perform reliable Both experimental computational studies were carried out on commercially available fibers in order understand response...

Numerical and experimental investigations are carried out to study the combined effect of rotation support nonuniformity on modal characteristics circular thick disks. The laboratory experiments stationary rotating disks conducted investigate effects partial conditions in-plane out-of-plane vibration responses annular with different radius ratios. results suggested that along circumferential directions boundaries affects disk directions, while introducing additional coupling between modes....

In this work, an FEA based methodology is proposed for the accurate prediction of stiffness properties top plate special application 6-DOF platform.The effect joint contact conditions on static and natural frequency analysed compared with experimental results.Top first designed using a simplified finite element model where considered to be rigid.The design failed meet actual operating when tested experimentally.The revised loading introducing realistic formulation.The results obtained are in...

Thermoacoustic refrigerators have huge potential to replace conventional refrigeration systems as an alternative clean technology. These devices utilize conversion of acoustic power and heat energy generate the desired cooling. The stack plays a pivotal role in performance Standing Wave Refrigerators (SWTARs), transfer takes place across it. Performance stacks can be significantly improved by making arrangement different materials inside stack, resulting anisotropic thermal properties along...