Ahsan Ali Khan

International Islamic University Malaysia | iium · Department of Manufacturing and Materials Engineering

Supply chain management (SCM) has been well-known to strongly influence the company performance. in food manufacturing industries. In this study quality, time, information, flexibility, and integration have been selected as variables to predict their influence on Kuwait food industries. The methodology of the study was developed where five hypothes...

Fuel cell is one of the promising power generators that can convert chemical energy in the reactants (hydrogen and oxygen) into useful electrical current, water and heat. It can be used as a power plant to power vehicles propulsion system. This technology is new to the automotive industries in Malaysia, where the default engines used in vehicles ar...

In this study, the effect of nickel powder mixed dielectric fluid on Electrical Discharge Machining (EDM) performance of mild steel has been carried out. Peak current, tool/electrode diameter and concentration of powder are the process parameters. The process performance is measured in terms of material removal rate (MRR), tool wear rate (TWR), and...

Glioblastoma Multiforme (GBM) is the most lethal brain malignancy which involves multi-gene abnormality. Unfortunately, effective therapy against GBM is still lacking. Previously, we found that NRP-1 and its downstream NRP-1/GIPC1 pathway played an important role in GBM. In this study, we further investigated the upstream signaling of NRP-1 to unde...

This paper reports on the surface characteristics of a functionally graded Titanium (Ti-6Al-4V) alloy during Electrical Discharge Machining (EDM). The electrical discharge input parameters employed for this work are current (I), on-time (Ton), off-time (Toff) and spark gap voltage (V). The electrode used for EDM of the titanium workpieces is an ele...

The use of coolant during cutting processes does not only help in the improvement of surface integrity and increase in tool life, but it also facilitates the conservation of energy due to reduction in power consumed during the process. However, some of these coolants affect human health negatively, hence there is need to consider alternatives. The...

Electrode material in the electro discharge machining (EDM) process plays an important role in terms of material removal rate (MRR), electrode wear rate (EWR) and surface roughness (Ra). The purpose of this research is to investigate the capability of different electrode materials: copper, aluminum, and graphite in EDM of AISI 304 stainless steel a...

With increasing applications of nanomaterials, including silver nanoparticles (AgNPs), unknown potential risks are present against humans and the environment, especially to the fetus and neonates, which are more sensitive to the cytotoxicity of such agents. This study focused on the effects of AgNP exposure on newborn neurons differentiated from ne...

Wire electrical discharge machining (WEDM) is a unique machining technique which is capable of machining parts with high degree of complexity regardless of their hardness. However, when high precision and accuracy are needed, the taper and corner roundness on the workpiece machined need to be controlled to ensure that the parts can perform their in...

Background: Stem cell therapy provides great promising therapeutic benefits for various neurological disorders. Cell transplantation has emerged as cell replacement application for nerve damage. Recently, nanomaterials obtain wide development in various industrial and medical fields, and nanoparticles have been applied in the neurological field fo...

It is imperative for a manufacturing company all over the world to constantly look for ways to increase productivity and at the same time to lower cost to secure a competitive position. It is recognized that practices associated with Japanese Manufacturing Management (JMM) can yield a superior competitive advantage in terms of productivity, quality...

This paper presents an investigation of aluminium heat sink designs with thermoelectric generator. Basically, for thermoelectric generator (Peltier module), the thermal conversion uses Peltier effect. Two heat sinks with different design, with thermoelectric module of Bismuth Telluride, Bi 2Te 3 were used in this investigation. The simulation and e...

In recent years there is an increasing interest of Electrical Discharge Machining (EDM) process, with particular emphasis on the potential of this process for surface modification. In this study, the effect of various EDM parameters on the material removal rate (MRR), tool wear rate (TWR) and surface roughness (SR) using powder-mixed electrical dis...

One of the main challenges for any manufacturer is how to decrease the machining cost without affecting the final quality of the product. One of the new advanced machining processes in industry is the high speed hard end milling process that merges three advanced machining processes: high speed milling, hard milling and dry milling. However, one of...

The main challenge for any manufacturer is to achieve higher quality of their final products with maintains minimum machining time. In this research final surface roughness analysed and optimized with maximum 0.3 mm flank wear length. The experiment was investigated the effect of cutting speed, feed rate and depth of cut on the final surface roughn...

Alumina powder was added to dielectric fluid during Electrical discharge machining (EDM) of AISI 304 steel. The main machining parameters of current (A), tool diameter (mm) and powder concentration (g/L) were chosen to determine the EDM machining characteristics of material removal rate (MRR), tool wear rate (TWR) and surface roughness (Ra). This w...

This paper is the outcome of a small scale hybrid energy generator (hydro and photovoltaic) project. It contains the photovoltaics part of the project. The demand of energy resources is increasing day by day. That is why people nowadays tend to move on and changes their energy usage from using fossil fuels to a cleaner and green energy like hydro e...

Objective To observe advantages and disadvantages of the resection of intramedullary spinal cord tumor under awake anesthesia. Methods Two patients with intramedullary spinal cord tumor underwent resection under awake anesthesia and followed up post-operatibely for any motor deficits. Results Patients who underwent tumor resection under awake (AA...

The main challenge for any manufacturer is to achieve higher quality of their final products with maintains minimum machining time. In this research final surface roughness analysed and optimized with maximum 0.3 mm flank wear length. The experiment was investigated the effect of cutting speed, feed rate and depth of cut on the final surface roughn...

One of the main challenges for any manufacturer is how to decrease the machining cost without affecting the final quality of the product. One of the new advanced machining processes in industry is the high speed hard end milling process that merges three advanced machining processes: high speed milling, hard milling and dry milling. However, one of...

In recent years there is an increasing interest of Electrical Discharge Machining (EDM) process, with particular emphasis on the potential of this process for surface modification. In this study, the effect of various EDM parameters on the material removal rate (MRR), tool wear rate (TWR) and surface roughness (SR) using powder-mixed electrical dis...

Alumina powder was added to dielectric fluid during Electrical discharge machining (EDM) of AISI 304 steel. The main machining parameters of current (A), tool diameter (mm) and powder concentration (g/L) were chosen to determine the EDM machining characteristics of material removal rate (MRR), tool wear rate (TWR) and surface roughness (Ra). This w...

This paper reports on a new method used to estimate the spark radius in the gap during electrical discharge machining (EDM). This method combines the heat flux and energy equations of the copper electrode. The energy partition between workpiece and electrode (tool) due to EDM process was estimated using the ratio of thermal conductivity of the work...

Post-stroke neuropsychiatric (NP) disorders are common and have complex etiologies. Multiple factors such as lesion location, personality characteristics, socioeconomic status, pre-stroke psychiatric history, and family support are the determining factors in most cases. Although depression and anxiety are more common, emotional incontinence and cat...

Objective . Systematic review and meta-analysis to observe the efficacy and safety of stem cell transplantation therapy in patients with brain ischemia. Methods . We searched Cochrane Library, PubMed, Ovid, CBM, CNKI, WanFang, and VIP Data from its inception to December 2015, to collect randomized controlled trials (RCT) of stem cell transplantatio...

Glioma occurs due to multi-gene abnormalities. Neuropilin-1 (NRP-1), as a transmembrane protein, involves in glioma proliferation, invasion, and migration, as well as tumor angiogenesis. The cytoplasmic protein, GAIP/RGS19-interacting protein (GIPC1), could regulate the clathrin-vesicles trafficking and recycling. Here, we show that NRP-1 co-locali...

With the increasing global demand of micro components, the manufacturing technique goes toward miniaturization T. One off these applications is the The carbon nanotube (CNT). It is one of the new applications that that can play vital role in based on economic factors such as material removing rate MRR and the electrode wear rate EWR. The main obje...

Wire erosion discharge machining is one of the non-traditional machining processes which use heat energy of spark to remove material from work piece. Process parameters have given the major influence of the cutting performance on wire EDM. Parameters such as pulse on time, peak current, wire diameter and discharge current are well known for their e...

Electrical discharge machining (EDM) is one of the most reliable and precise manufacturing processes that applicable for creating complex geometries. However, the high heat produce on the electrically discharged material during the EDM process will minimize the surface quality of final product. Carbon nanotubes possess unexpected strength and uniqu...

One of the main machining characteristics that play vital role in determining the quality of engineering components is surface integrity. The fatigue strength, corrosion and wear resistance is enhanced by good quality surfaces of the work piece. The purpose of this research is investigating and optimizing the effects of three parameters: peak curr...

In the today’s modern world most of the systems are equipped and managed with computing technologies. The computing technology can also be deployed in transportation system. In this paper, we present implementation of a new transportation system, which facilitates users with tracking services of both vehicles and persons. The proposed system is tes...

In this review, Neuropilin-1 (NRP-1) has been focused as a novel molecular target for potential treatment of gliomas. The properties of NRP-1 were described briefly. The role of NRP-1 in gliomas was explored in details, including relationships of NRP-1 expression and glioma prognosis, Sema3A-NRP-1 signaling in gliomas, NRP-1 signaling and VEGF/VEGF...

This research work describes the effect of powder concentration in dielectric fluid during electrical discharge machining (EDM) of mild steel on material removal rate (MRR), electrode wear rate (EWR) and work surface roughness (Ra). The machining parameters studied in this research are current (4.5A, 5.5A, and 6.5A) and concentration of the powder...

Electrical discharge machining (EDM) is one of the most commonly used technique to machine very hard materials. Materials like hardened tool steels, titanium and its alloys and difficult-to-machine materials can be easily processed with EDM. The machining performance to a great extent depends on the composition of the electrode. This paper presents...

Electrical discharge machining (EDM) is machining process that is suitable for machining very hard materials that are electrically conductive. In this process the material is removed by series of repeated electrical discharges, produced by electric pulse generators at short intervals in dielectric fluid medium. Thus, the electrical parameters are t...

Titanium (Ti-6Al-4V) alloy is very attractive for many applications due to its high strength-to-weight ratio and high corrosion resistance. Even then, with these attractive properties, it has poor shear strength and surface wear properties. This study is therefore undertaken to investigate the effect of sliding parameters on the surface wear behavi...

Powder-mixed electrical discharge machining (PMEDM) is the technique of using dielectric fluid mixed with various types of powders to improve the machined surface output. This process is fast gaining prominence in electrical discharge machining (EDM) industry. The objective of this investigation is to determine the ability of tantalum carbide (TaC)...

The use of nonconductive ceramic materials is increasing rapidly in industrial and engineering applications due to its high hardness, low thermal conductivity, and resistance to oxidation. Machining operations for fabricating structures from nonconductive ceramic materials are difficult and most of the traditional machining techniques are not appli...

electrical and thermal conductivity of electrode materials in Electrical Discharge Machining (EDM) is the main factors that determine the suitability of these electrodes. These electrodes are usually made from graphite, copper and copper alloys because these materials have high electrical and thermal conductivity in additional to high melting tempe...

This paper presents the vibration issue in micro end milling of of poly methyl methacrylate (PMMA) workpiece using integrated multi-process machine tools DT 110 (Mikrotools Inc., Singapore) with control parameter; spindle speed, feed rate and depth of cut. The vibration was measured using accelerometer (DYTRAN Instruments Inc., USA). The optimum so...

Electrical discharge machining (EDM) is a very complex and stochastic process. Thus, it is difficult to predict or to estimate its output characteristics accurately by mathematical models. Therefore, the non-conventional techniques for modeling become more effective. In this research, the Artificial Neural Network (ANN) was applied as an effective...

Dielectric fluid is one of the major components of electrical discharge machining. In this article, the influence of two dielectric fluids on the surface properties of workpiece was investigated. Machining was conducted on the titanium alloy (Ti-6Al-4V) with the new Cu-TaC composite electrodes under the two dielectric fluids, which are the urea sol...

Surface roughness of a workpiece is one of the measures used in evaluating the performance of any machining technique. In this paper, the behaviour of a post-EDM roughness of mild steel material subjected to machining with two different electrodes is evaluated through modelling using three machining variables. The variables are peak current, pulse...

During electro-discharge machining (EDM), debris particles are generated in the machining gap from the eroded materials. If they are not quickly removed, arcing would occur, and this reduces the machining efficiency. The introduction of external magnetic field (EMF) is a research innovation which tries to facilitate quick removal of this debris awa...

Electrical discharge machining (EDM) is one of the most extensively used non conventional material removal processes to machine very hard material. Such materials like hardened tool steel, titanium and its alloy, Hastelloy which were hitherto difficult to machine can be easily processed with EDM. Tool electrode being the main component of the machi...

The resistance of a material to an indentation on microscopic scale is an indication of its micro-hardness. To a lubrication engineer, micro-hardness is synonymous with surface wear resistance of a material. In this study, an attempt was made to enhance the surface micro-hardness of titanium alloy (Ti-6Al-4V) through modification of electrical disc...

In many investigations, large number of process, or design parameters that are initially thought to affect the outcomes or outputs may not really have statistical significant influence on them. Screening experiments are used to identify the key parameters (factors) that significantly affect these outcomes. In this investigation, Plackett-Burman scr...

Electrical discharge machining (EDM) is one of the non-traditional machining processes normally used in manufacturing very hard materials that are electrically conductive. Tool electrodes form one of the main components of the machining system. The major properties that determine the suitability of such electrodes are electrical conductivity, therm...

In this investigation, electrical discharge machining (EDM) was done with Cu-TaC powder metallurgy (PM) electrode and urea solution dielectric fluid. The main objective is to improve the surface wear property of Ti-6Al-4V alloy through the formation of hard ceramic compounds on its surface during EDM. The experiments were conducted with peak curren...

Powder mixed electrical discharge machining (PMEDM) is one of the recent innovations for the enhancement of the capabilities of EDM process. In this study, the effects of powder addition on the surface modification of mild steel were investigated. Copper tungsten electrode was used in the machining. Two different powders namely TiC and Al2O3 were u...

In this investigation, the powder metallurgy (PM) electrode developed from cobalt (Co) and chromium (Cr) powders was used in electrical discharge machining (EDM). This new Co-Cr sintered electrode was used to machine mild steel workpiece with kerosene dielectric fluid. The main objective is to modify its surface characteristics and secure increased...

Powder-mixed dielectric fluid is one of the innovations of electro-discharge machining (EDM) which seeks to improve the process outputs by addition of powders to the dielectric during machining. In the present study, the influence of TaC powder in kerosene dielectric fluid on EDM process outputs was investigated. Experiments were conducted with the...

In this investigation, electrical discharge machining (EDM) was done with Cu-TaC powder metallurgy (PM) electrode and urea solution dielectric fluid. The main objective is to improve the surface wear property of Ti-6Al-4V alloy through the formation of hard ceramic compounds on its surface during EDM. The experiments were conducted with peak curren...

Electrical Discharge machining (EDM) is a thermal process in which sparks discharging with high energy density at high temperatures are used to melt and evaporate a small amount of workpiece. Under this condition, both the cutting tool (electrode) and the workpiece are subjected to very intensive heat energy generated in the system, and thus implyi...

The possibility of using the surface alloying that does occur during electrodischarge machining is used in this research to modify the surface of the titanium alloy.

The Poster investigates the possibility of production of EDM electrodes from Copper and Tantalum Carbide powders through Powder Metallurgy method.

This paper presents investigation on the alloying capability of Cu-TaC electrode during electrical discharge machining (EDM). The electrode produced through powder metallurgy technique was used in machining alpha-beta titanium alloy (Ti-6Al-4V) under different machining conditions. EDM experiments were conducted with distilled water as dielectric f...

This paper presents investigation on the alloying capability of Cu-TaC electrode during electrical discharge machining (EDM). The electrode produced through powder metallurgy technique was used in machining alpha-beta titanium alloy (Ti-6Al-4V) under different machining conditions. EDM experiments were conducted with distilled water as dielectric f...

The main aim of this paper is to investigate the properties of Cu-TaC electrodes produced by Powder Metallurgy (PM) method. The design of Experiment (DOE) method was used to plan the investigation. Two different compositions of the powders (Cu-TaC with 30 and 55 % wt TaC) were used. The major properties which determine suitability of electrodes for...

Surface integrity of machined parts is one of the major machining characteristics that play an important role in determining the quality of engineering components. It is a well-known fact that good quality surfaces improve the fatigue strength, corrosion and wear resistance of the work piece. The purpose of this study was to investigate the effects...

This book comprises heat transfer fundamental concepts and modes (specifically conduction, convection and radiation), bioheat, entransy theory development, micro heat transfer, high temperature applications, turbulent shear flows, mass transfer, heat pipes, design optimization, medical therapies, fiber-optics, heat transfer in surfactant solutions,...

In the present study to produce a typical hip joint, Investment casting has been selected as casting method since this process can give optimum properties of the product having complex geometry with biocompatible material. In order to perform this casting, a die or mould is needed to fabricate wax pattern, which will be used to make ceramic investm...

Electrical Discharge Machining (EDM) has been used in recent years to modify surfaces of the work materials to achieve additional properties in terms of hardness, wear resistance etc. This paper reports the investigations carried out using powder metallurgy (PM) compacted Cu-TaC electrodes to possibly achieve the surface modification. The main elec...

Surfaces machined by electrical discharge machining (EDM) can be improved in terms of hardness and corrosion resistance by addition of powder to the dielectric fluid during EDM. In the present study TaC powder was mixed at three different concentrations with kerosene as dielectric fluid during EDM. The output parameters investigated were material r...