Dr. Aref Naimzad - Academia.edu (original) (raw)

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Papers by Dr. Aref Naimzad

Regular, 2020

Paper The energy shortage in today's world has shifted the view of researchers to the optimal... more Paper The energy shortage in today's world has shifted the view of researchers to the optimal use of available energy, and experts from energy research centers have always taken steps to achieve this important issue. In the present study, the focus is on the simulation of a mixed system which, in addition to generating power, uses the heat dissipated from its chimney to produce cooling using an absorption chiller. This mixed system is simulated in EES software. The performance of the mixed system is examined in three different views, and in each view, the values of cold loads are obtained from the absorption chiller.

EIDOS, 2024

In this paper, an intensive review was made to propose En este artículo se realizó una revisión i... more In this paper, an intensive review was made to propose En este artículo se realizó una revisión intensiva para
Fibers Pavement Concrete (FPC) for Salang-Road proponer concreto de pavimento de fibras (FPC) para
Afghanistan. Moreover, structural properties of FPC Salang-Road, afganistán. además, también se evaluawere also evaluated and compared with those of ron las propiedades estructurales del FPC y se comAsphalt road. There are various benefits in application
of Fiber within rigid pavement. For instance, FPC has longer life and lower maintenance cost in compare
with the flexible pavement. In rigid pavement
design temperature and thickness are two effective
parameters that could widely affect by inclusion of fiber
to the total cost of the Salang Road-Project. Different
types of fibers with volume fraction optimization which
economical and safe are introduced. A concept was
adopted to quantify the benefits of adding fiber in terms of extension of the pavement service life and also
in terms of reduction in the concrete thickness for the same service life of both reinforced and unreinforced
concrete pavement sections. that the use of fibers
reduces the thickness of road pavement, enhance the durability and subsequently decreases the overall cost of road construction of Salang rigid pavement.

IJLEMR, 2021

This paper deals with the fabrication and operational study of an adjustable, two fingers flexibl... more This paper deals with the fabrication and operational study of an adjustable, two fingers flexible miniature gripper based on porous magnetorheological nanocomposites having the adjustability of pre-openings of the jaw's tips. The fabricated gripper grasps the small size and thin objects, maintain them and release them as required upon reducing the electrical current. The lead, package papers, wax, foams, silver film and silicon wafer sheets were used as under experiments materials and it has been noticed that it is working properly to grip the things which has rough surfaces at all. To grip the greater objects, it can be adjusted through its tips as well. This type of grippers includes the simple montage, lower fabrication prices and owns lower volume as well as weight, and there will be no need to apply the classic mechanical linkage inside. The results show that this type of grippers need less electrical energy to actuate and produce the lower forces in output. It is recommended to use the present gripper for the micro electromechanical systems, especially in the holding and transporting of sensitive work pieces against scratches, fingerprints and pressure.

Modares Mechanical Engineering

This paper deals with the design and fabrication of an adjustable, two fingers flexible miniature... more This paper deals with the design and fabrication of an adjustable, two fingers flexible miniature gripper based on porous magnetorheological nanocomposites having the adjustability of pre-openings of the jaw’s tips and its operational study in according to the performance. The fabricated gripper holds the small size and lightweight objects, maintain them and release them as required upon reducing the electrical current. The magnetic analysis has done and magnetic simulation has conducted using Vizimag software. The lead, condensed papers, foams and silicon wafer sheets were used as under experiments materials and it has been noticed that it is working properly to grip the things which has rough surfaces at all. For a greater objects, it can be adjusted through its tips as well. In this scheme, the magnetic actuation has been used because the magnetorheological nanocomposites is the most sensitive materials against the magnetic field. This type of grippers includes the simple montage, lower fabrication prices and owns lower volume as well as weight, and there will be no need to apply the classic mechanical linkage inside. This type of grippers are recommended for applications in the fields of the micro electromechanical systems, especially in the holding and transporting of sensitive work pieces against scratches, fingerprints and pressure.

Smart Materials Research

This paper presents a brief experimental comparative study on electrical and dielectric propertie... more This paper presents a brief experimental comparative study on electrical and dielectric properties of two sets of porous and nonporous MRNCs, each including five samples of film-shaped magnetorheological nanocomposites (MRNCs) based on room temperature vulcanized (RTV) silicone rubber and nano -sized carbonyl iron particles (CIPs).The electrical and dielectric properties of porous and nonporous MRNCs were measured at five different filler concentrations. Several experiments were performed to measure the volume resistivity, dielectric constant, and dielectric loss. The MRNCs dielectric properties were analyzed with respect to the parameters like frequency and CIPs loadings. The electrical conductivity was studied in terms of volume resistivity. The comparative investigation suggests the porous MRNCs for smart and light-weighted structures those benefits from a lower electrical property, dielectric losses, and dielectric constants.

IJISME

This paper presents a comparative study on mechanical and magnetic properties of two sets, each i... more This paper presents a comparative study on mechanical and magnetic properties of two sets, each including five samples of film-shaped magnetorheological nanocomposites (MRNCs) based on RTV silicone rubber and nano-sized carbonyl iron particles (CIPs). One set of sample was prepared by polymerization of silicone rubber with CIPs and silicone oil, while the other set obtained by filling the ammonium bicarbonate (NH4HCO3), CIPs and silicone oils. Both set of samples were manufactured under isotropic condition and their microstructures was characterized by XRD and EFSEM. Porosity characteristics was measured by displacement method and porosity image analysis was applied using ImageJ and Origin Pro Software. The mechanical tensile tests was conducted using Gotech tensile strength tester and the density of samples was observed experimentally and estimated theoretically. The magnetic properties of MRNCs were practically determined using VSM test. Plateau stress induced by the applied magnetics fields and MR effects was determined. Through fabrication of film-shaped MRNCs, the samples deflections was measured against applied magnetic fields .The comparative investigation results show that porosity improve the mechanical and magnetic properties of MRNCs and porous MRNCs will be the good candidate for miniature and flexible gripper’s jaws.

Abstract Magneto-Rheological Nanocomposites(MRNCs) are the new category of smart materials whic... more Abstract
Magneto-Rheological Nanocomposites(MRNCs) are the new category of smart materials which are sensitive against applied magnetic fields. MRNCs consisting of nano-sized carbonyl iron particles embedded in a silicone rubber matrix, display a variety of interesting properties to design the flexible actuators. To reach to the desired properties of nanocomposites, a laser ablation setup is employed to prepare the carbonyl iron’s nanoparticles. First, the micron-sized carbonyl iron powder is ablated to a range of 23-85 nanometers using laser ablation setup. Then, the MRNCs based on silicone rubber is successfully fabricated under isotropic condition and characterized by means of XRD , FESEM, DMTA and rheology as well. The magnetic properties of MRNCs are practically determined via a VSM test. Through successful fabrication of MRNCs , the sample beams are made and their displacements are measured against applied magnetic fields. The MRNCs beams will be the good alternatives for flexible gripper’s jaws.

Magneto-rheological Nanocomposites (MRNCs), consisting of carbonyl iron particles with nanometer ... more Magneto-rheological Nanocomposites (MRNCs), consisting of carbonyl iron particles with nanometer dimension embedded in a silicone rubber matrix, display a variety of interesting physical properties. The modulus of MRNCs can be controlled by strength of magnetic fields. The 10 μm carbonyl iron particles are ablated to the ranges between 20 to 80 nanometers using the CO2 laser setup. The MRNCs is fabricated under isotropic condition and characterized by means of optical and FESEM. In the course of material development, the magnetic attraction is compared among four nanocomposite samples containing the different percentages of nano-sized carbonyl iron particles. The mechanical property tests are conducted to determine the hardness and the elastic modulus. The rheological tests are conducted to study the curing aspects of MRNCs. The magnetic properties of MRNCs are practically measured. Through successful development of MRNCs, the produced MRNCs are used in its potential applications for a miniature gripper.

Nanocomposites, consisting of nickel particles with nanometer dimension embedded in a nylon matri... more Nanocomposites, consisting of nickel particles with nanometer dimension embedded in a nylon matrix, display a variety of interesting smart physical properties. CO2 Laser has been shown to be suitable for the preparation of nickel nano particles. In this work, the 2.5 micron-sized nickel powder has been ablated to 5 nanometers through a CO2 Laser in a room temperature at first. Then, the Nickel-Nylon nanocomposite was successfully fabricated under isotropic condition at 120oC and characterized by means of optical, scanning electron microscopes (SEM),field emission scanning electron microscopes (FESEM), transmission electron microscopes(TEM) and XRD as well. The primary mechanical properties obtained from the tests which are the hardness and the elasticity modulus is determined. The micro-mechanical properties were analyzed and its magnetic properties were practically determined. Through successful development of Nickel-Nylon nanocomposite, the produced nanocomposite is proposed in its potential applications for aircraft smart-spider webs system. Using of Nickel-Nylon Nanocomposite enhance performance of spider webs system during the flight.

ipcsit.net

Smart composites based on carbonyl-iron particles in a silicone rubber known as magneto-rheologic... more Smart composites based on carbonyl-iron particles in a silicone rubber known as magneto-rheological Elastomer (MREs) whose modulus can be controlled by strength of magnetic fields. In this article, MRE materials based on silicon rubber matrix are fabricated without applying magnetic field. The mechanical properties and SEM images are investigated. MRE samples were fabricated by two-component silicone rubber with 50 % content of 10 μm sized carbonyl-iron particles by volume. In the course of material development, samples of carbonyl-iron filled by silicone rubber are produced and their mechanical and magnetic properties are practically determined. The developed MRE samples are placed in the magnetic field that varied from 0 to 100 kA/m. The observations of samples in the presence and absence of the magnetic field show that the magnetic field increased the stiffness of the material. Additionally, the rheological properties of MREs are tested in a magnetic field. Through successful development of Magneto Rheological Elastomer, the produced MRE is used in its potential applications for a miniature gripper. Using the developed MRE, a miniature gripper is designed and fabricated. Developments of MREs along with design methodology of grippers enhance performance of micro-mechatronics system used in medical and metrological devices as well.