Issam S. Jalham

• PhD
• CEO at University of Jordan

Aim: The aim is to study the effect of freshly placed composite build-ups on setting of additional silicone impression materials. Settings and design: In vitro - experimental study. Materials and methods: Three composite materials; Build-It™ F. R™, Filtek™ Bulk Fill flow and Filtek™ Z350 and three light-bodied additional silicone impression ma...

In the present investigation, aluminum cast alloys were produced, age hardened, and tested after adding a varying manganese content (from 0.1to 0.5%) and Cu content from (1.5-7%) with constant Mg-Si-Fe composition and Al as the dominant constituent. Results showed that the addition of Mn to the alloy increased the tensile properties and hardness up...

This paper aims at investigating the effects of service quality, satisfaction with the service recovery, value, image, and price on passenger's overall satisfaction and loyalty. Three models are developed then analyzed. Model I studies the effect of in-flight services, flight availability, reservation and ticketing, airport services, employee servi...

Polymeric sheets with different mixing compositions of bakelite and polystyrene were manufactured using the hot pressing method. Microstructure examination, water absorption, impact strength, wear resistance and infrared thermography tests were performed. It was found that there was a homogenous distribution of the bakelite particles in polystyrene...

Jordan is totally dependent on imported crude oil and petroleum products to meet all its energy requirements, which is a significant load on the government's budget and the development of Jordan’s economy. So far, one of the important local sources of energy in Jordan is oil shale. Since Jordan has recently seen number of activities on oil shale ex...

In response to rapid expansion rate of technological change and information technology, and increasing customer demands, Next Generation Manufacturing Systems (NGMS) and Fit Production Systems (FPS) are emerged. Lean Production (LP) covers a wide range of production concepts and philosophies that can be classified as NGMS and/or FPS. In this paper,...

This research implements the well-known six sigma approach define-measure-analyze-improve-control (DMAIC) to improve the performance of direct compression process with two quality responses; tablet's weight and hardness. At current factor settings, the x and s charts are judged in-control for both responses. However, the process was found capable f...

This research proposes an approach for optimizing fuzzy multiple responses using desirability function and fuzzy regression. Each response repetition is transformed into signal to noise ratio then modeled using statistical multiple regression. A trapezoidal fuzzy regression model is formulated for each response utilizing the statistical regression...

Today's harsh competition has forced telecom companies to continually enhance customer satisfaction, which leads to repurchases intention and consequently larger market share. Determination the key success factors in gaining competitive advantage within telecom industry has received significant research attention in different countries. This resear...

The uniformity of the alignment-layer thickness on indium tin oxide glass plays an important role in producing liquid crystal display panels of quality images. However, thickness non-uniformity results in producing liquid crystal display panel of poor color image, which increases rework cost and scrap. The Taguchi method is utilized in the define-m...

The fuzzy regression has been found effective in modeling the relationship between the dependent variable and independent variables when a high degree of fuzziness is involved and only a few data sets are available for model building. This research, therefore, proposes an approach for optimizing multiple responses in the Taguchi method using fuzzy...

The effect of the type of the bonding interlayer on the mechanical behavior of laminated glass was studied in this paper. Furthermore, this investigation presents mathematical models that helps in predicting this behavior based on the glass plate thickness and the type and thickness of the bonding material. Both practical results and the theoretica...

In this work the effect of the type of the bonding interlayer (polyvinyl butyral (PVB) or Ethyl Vinyl Acetate (EVA)), number of bonding layers, and the position and the thickness of the Glass plates on the maximum load capacity and absorbed energy by laminated glass. Furthermore, this investigation presents a mathematical model that relates the max...

Prediction of the shrinkage for the manufacturing purposes of composite materials is not an easy task. The use of existing mathematical and statistical tools may help in solving part of the problem. On the other hand, artificial network tools are of a great importance too. In this investigation, a two-stage Artifitial neural network was used to pre...

An airline fueling system maintains fuel levels at full tank capacities by ordering fuel shortages on a daily basis. Although this policy avoids fuel stock out, but it results in excessive inventory. This research aims at determining the days of inventory on hand (DOH) that reduces the cost of total inventory cost while avoiding stock out using sys...

In this investigation, a combined experimental approach of micro-structural observation and compressive load capacity testing were followed to determine the behavior of bakelite matrix material reinforced with Jordanian silica sand. It was found that the reinforced samples gave a higher maximum load capacity than the pure matrix, because the homoge...

Integration of technologies such as medical imaging, types of software such as pro engineer, and modern fabrication processes such as RP is important in the medical field. It enabled to solve some medical problems specially those considering bio-parts replacement and prosthesis. This study presents a methodology that helped replace the wearied hip...

A multiproduct class, multiworkstation Constant Work-In-Process (CONWIP) controlled job shop is formulated and analysed by applying the Markovian network model, in such a way that yields a feasible level of CONWIP. A new approach for analysing the job shop network model was presented and routing probability matrix and model solutions were derived a...

Purpose To develop a model for manufacturing strategy formulation and implementation to help the managerial body of a corporation improve the efficiency and effectiveness of their company. Design/methodology/approach The quality function deployment (QFD) technique is used in the formulation process to provide the basis for selection between option...

In this investigation, a comparative study among different types of coating materials to improve wear resistance of steel has been conducted. Three types of coating materials: magnesium zirconate, aluminum bronze, molybdenum, and mixtures of different percentages of them were used. The influence of load, velocity, and counter surface roughness on e...

In this study, natural rubber (NR) was reinforced with the unique composition of Jordanian silica sand at different loadings (10, 30, 50, and 75 pphr) and different particle sizes (10, 25, 45, and 75 μm). Several tests, such as hardness, tensile strength, elongation at break, compression set, compression stress-strain, and density are conducted to...

A computing algorithm is suggested to computerise the quality function deployment (QFD) method, which is used for product planning development and manipulated so that it would be suitable for selecting the optimum material for a certain application. The need for this computerised method is to avoid the complexity when there is a large number of can...

In this investigation, a decision-making IIT approach for materials selection has been proposed. This approach consists of three phases which are the preselection, selection, and postselection and techno-economic phases. This approach diÄers from other approaches in taking into consideration the economic and business issues factors. Going from one...

In this paper, a concept for a solution base for the material selection problem-solving process has been introduced by modifying the solution-base structure. To be able to solve the material selection problem, the existing material selection techniques were reviewed and the choice of the suitable technical, economic or techno-economic techniques is...

The surface properties of polymer matrix composite materials reinforced with Jordanian silica sand and cement subjected to abrasive wear has been studied in this investigation. Process variables, such as velocity, load, and time and material variables, such as volume fraction of the reinforcement and particle size are studied using weight loss meas...

In this investigation, a comparative study among different types of coating materials to improve the wear resistance of steel was conducted. There were three types of coating material, magnesium zirconate, aluminium bronze, and molybdenum, and mixtures of different percentages of them were used. The influences of load, velocity and counter surface...

Due to the nonlinear complex effect of the reinforcement content and the deformation conditions such as temperature and strain rate on the flow stress, the existing models especially those dependent on the activation energy are not suitable to predict the hot deformation behavior. To achieve this purpose, it was decided to use the property of some...

In this investigation, the empirical formula that is used to predict the strength of the composite material has been compared to the predictions of the strength of Al-based composites by the trained artificial neural network (ANN), and trained Neuro-fuzzy network. To achieve this purpose, four schemes of evaluation have been used. The results showe...

Problem recognition was obvious to the management body of the disposable cup factory as looking at the scrap bin and realizing that some specific part of the process is causing substandard and defected products. Fourteen types of defects were recognized and the problem solving approach combined with quality control charts and tensile testing was us...

Problem recognition was obvious to the management body of the disposable cup factory as looking at the scrap bin and realizing that some specific part of the process is causing substandard and defected products. Fourteen types of defects were recognized and the problem solving approach combined with quality control charts and tensile testing was us...

The aim of this paper is to investigate the capability of the artificial neural network (ANN) to predict the effect of the hot deformation parameters on the strength of Al-base Metal Matrix Composites by comparing the results of the ANN predictions to the results of predictions by the RBF approach in our previous work. The experimental results of t...

This work is an extension of a previous work on exploiting local materials in Jordan. The work included the purification of Jordanian silica, exploration of the potentials of this sand for industry and the invention of a new composite material reinforced with Jordanian silica sand and cement. To study the possibility of controlling the properties o...

In direct diffusion bonding of sialon to stainless steel, thermal residual stresses arise due to the difference in coefficient of thermal expansion of the two materials. These stresses frequently lead to failure of the bond. This behaviour is further influenced by the formation of interfacial reaction layers between ceramic and metal and the proble...

Empirical models such as the power Arrhenius relationships or the relationships that depend on the Zener–Hollomon parameter have failed or been found to be followed only roughly when applied to composite materials. The reason may be the unclear mechanism of deformation in composites which comes from the input physical quantities that are thought to...

Joining of sialon to austenitic stainless steel has been carried out using active brazing alloys. Copper–silver eutectic alloys do not react with sialon at 900°C and no wetting or chemical bonding occurs, however, it was shown that copper–silver with addition of Ti to form active braze alloys, reacted chemically to cause wetting and chemical bondin...

In this investigation, the mechanical, physical, and chemical properties of Jordanian silica sand at Ras En-Naqab were studied. The possibility of extracting the sand from its ores to obtain a sand with a high content of SiO2 and less content of impurities, espe- cially Fe2O3, by designing a processing flow chart for treatment and purification of t...