Waleed Ahmed

United Arab Emirates University | UAEU · Engineering Requirements Unit

Natural fibers or their derivatives have gained significant attention as green fillers or reinforcement materials due to their abundant availability, environment-friendly nature and biodegradability for sustainable development. Despite the availability of modern alternatives such as concrete, glass-fiber/resin composites, steel, and plastics, there...

Due to the prevailing existence of the COVID-19 pandemic, novel and practical strategies to combat pathogens are on the rise worldwide. It is estimated that, globally, around 10% of hospital patients will acquire at least one healthcare-associated infection. One of the novel strategies that has been developed is incorporating metallic particles int...

In this study, a finite element model was developed, and a detailed analysis was carried out to investigate the impact of inclusions on the mechanical characteristics of a 3D-printed composite sandwich beam that could initiate when printing the layers, especially during the transition period between the dissimilar material that would affect the int...

The revolution of 3D-printing technology has caused an additional source of plastic waste, especially the new generation of composite filaments that are linked with the commercial fused deposition modeling process, adding pressure to find a sustainable solution to tackle the emerging waste problem. This study aims to investigate the mechanical and...

Due exceptional properties such as its high-temperature resistance, mechanical characteristics, and relatively lower price, the demand for carbon fiber has been increasing over the past years. The widespread use of carbon-fiber-reinforced polymers or plastics (CFRP) has attracted many industries. However, on the other hand, the increasing demand fo...

VR Technology is advancing faster into the architectural environment in the last few years. This study aims to take a closer look into a multidisciplinary aspect of the current and future applications of VR technology in the architectural world. As per a trial done in a Design Studio class, the students were asked to develop their designs into BIM...

In this paper, Acrylonitrile-Butadiene-Styrene matrix composites reinforced with Nano-silica dioxide particles were examined and prepared to study their mechanical properties. The composite sheets were pre-prepared using the hot extrusion process. Due to its wide characteristics, silica dioxide additions can strengthen the usability and mechanical...

Microparticles of sand silica have been mixed with biodegradable waste (polylactic acid) from the fused filament fabrication process to investigate the impact on the mechanical properties. The composite mixtures were prepared using different compositions via a twin extrusion machine. Mechanical characterization using the Tensile Testing Machine was...

Construction projects are often challenged by tight budgets and limited time and resources. Contractors are, therefore, looking for ways to become competitive by improving efficiency and using cost-effective materials. Using three-dimensional (3D) printing for shaping materials to produce cost-effective construction elements is becoming a feasible...

In this contribution, a numerical investigation was made for heat transfer and steady magneto-hydrodynamic natural convection in a fined cold wavy-walled porous enclosure with a hot elliptic inner cylinder occupied by hybrid Fe 3 O 4-MWCNT /water nanofluid. The enclosure is also placed in a uniform magnetic field. The governing equations are verifi...

Silica exhibits properties such that its addition into polymeric materials can result in an enhanced overall quality and improved characteristics and as a result silica has been widely used as a filler material for improving the rheological properties of polymeric materials. The usage of polymers in three-dimensional printing technology has grown e...

With the rapid growth in the manufacturing industry and increased urbanization, higher amounts of composite material waste are being produced, causing severe threats to the environment. These environmental concerns, coupled with the fact that undergraduate students typically have minimal experience in research, have initiated the need at the UAE Un...

Antimicrobial materials produced by 3D Printing technology are very beneficial, especially for biomedical applications. Antimicrobial surfaces specifically with enhanced antibacterial property have been prepared using several quaternary salt-based agents, such as quaternary ammonium salts and metallic nanoparticles (NPs), such as copper and zinc, w...

This paper aims to investigate experimentally and using finite element analysis the performance of using three-dimensional printing technology to produce a composite sandwich panel that is made of the high-flexible core as well as with high stiffness upper and lower surfaces made of a glass fiber reinforced composite filament. There are many advant...

Hand-assistive devices are used to help post-stroke victims encumbered with hand impairments perform activities of daily living (ADL). Unlike robotic rehabilitation devices used in restricted medical conditions for designated periods, hand-assistive devices are designed to be portable and to be used for extended periods by individuals engaging in A...

The 3D printing technology started and developed at the early stages of the eighties, where it is based on constructing the object layer by layer by using the appropriate material and technology and where it helps in producing a physically real object through a digital transformation process. Using 3D printing technology has many benefits, especial...

There is significant interest today in additive manufacturing which is automatically producing 3D objects by adding layer-upon-layer of material. Additive manufacturing offers a revolutionary way of creating parts despite their geometric complexity compared to conventional manufacturing methods. Today, both the number of additive manufacturing proc...

Magneto-free convective of hybrid nanofluid with an inner adiabatically rotating cylinder and a hot side wall was analyzed in a non-Darcy-permeable cavity. The Darcy-Forchheimer model has been used for the permeable domain. The solutions of employing equations are obtained by the Finite Element Method. The role of different Rayleigh (103≤ Ra≤106) f...

Due to the significant properties of silica, thermostatics can be enhanced using silica-additives to maximize the quality of polymer compounds and transform plastics into tailored properties. The silica additives can enhance the handling and quality performance of composites and thermoplastic polymers due to their diverse potential. Besides, using...

In this paper, we have studied the impact of the pressure on the magnetic, elastic, and mechanical properties of the cobalt Co and cobalt hydride CoH using the full-potential linearized augmented plane wave (FPLAPW) method within the generalized gradient approximation (GGA). The obtained results show an excellent agreement with the available experi...

The impact of ionic liquid (IL) solution on the recycling process of polyethylene terephthalate (PET) waste containers used to store drinking water, with a focus on optimizing the added percentage and processing conditions of IL was studied. Characterization using differential scanning calorimeter (DSC), thermogravimetric analyzer (TGA), Fourier tr...

One of the main challenges that the educator faces in integrating 3D printing technology in a traditional engineering course in the capability of introducing and merging the 3d printing technology at the right educational material. The paper aims to present the challenges and the achievements of integrating 3D printing technology in teaching design...

Current environmental concerns have led to a search of more environmentally friendly manufacturing methods; thus, natural fibers have gained attention in the 3D printing industry to be used as bio-filters along with thermoplastics. The utilization of natural fibers is very convenient as they are easily available, cost-effective, eco-friendly, and b...

The study aims to investigate a wind turbine composite blade subjected to wind loading forces. Linear elastic fracture mechanics principle was used to evaluate the blade with a deteriorated adhesive layer through the estimation stress intensity factor of an edge crack at the adhesive layer. The opening and sliding mode of SIF were predicted and dis...

This paper examines the performance of 3D-printed concrete made with locally abundant desert dune sand. Cement was replaced by up to 10% silica fume and 30% fly ash to reduce its detrimental environmental footprint. The water-to-binder ratio used in the mix ranged between 0.35 and 0.40. Also, a superplasticizer was added in the range of 1 to 3%, by...

Major cities in most of the developing countries are becoming increasingly crowded. Conventional open-trench methods are expensive and lead to traffic disruption. The domestic government is looking at alternative approaches to install and rehabilitate aging underground utilities. The purpose of this study is to investigate the level of awareness an...

The scope of this study is the investigation of the effect of microstructure on fatigue behavior of Ti-15V-3Al-3Sn-3Cr (Ti 15–3) metastable beta titanium alloy. Aging treatment was applied to Ti 15–3 alloy at low and high aging temperatures. The fatigue crack initiation and propagation behavior of the alloy was determined by applying fatigue crack...

This work is spotting the light on utilizing 3D printing technologies in mechanical engineering education. Starting from elementary courses such as geometric modeling to the more advanced courses such as Fluid Mechanics and Mechanics of Materials. The authors of this work have an extensive experience in 3D printing technologies which allowed them...

It has been addressed that one of the factors that has a significant impact on the properties of the composite is the fiber/matrix interface that would increase the interfacial levels of the stresses which will reduce the overall composite stiffness and the fatigue lifetime eventually causing composite failure. Besides it has been concluded that in...

This work is spotting the light on utilizing 3D printing technologies in mechanical engineering education. Starting from elementary courses such as geometric modeling to the more advanced courses such as Fluid Mechanics and Mechanics of Materials. The authors of this work have an extensive experience in 3D printing technologies which allowed them t...

Purpose This paper aims to use quick response (QR) code along with online videos to teach one of the college foundation courses in an international institution to enhance the grasp of the students and to boost the students’ learning outcomes. Design/methodology/approach The study discussed and elaborated the findings that mainly focused on the usa...

E-learning offers tremendous benefits to teachers and students as it enhances the teaching and learning experience. Despite the adoption of e-learning in many educational institutions worldwide, delivery of construction management courses has been limited to traditional lecturing approach and the use of limited technology such as PowerPoint present...

Abstract In this research paper, we studied the structural, electronic and thermal properties of the zinc blende ternary alloys (AlxGa1�xAs) by the use of first-principles calculations based on FP-LAPW method (Full Potential Linear Augmented Plane Wave) within DFT (Density Functional Theory). Basically, the impact dependence of the lattice constants...

In the present work, the use of nano silica fume in developing a compressive strength of concrete that can lead to improvement in concrete construction is carried out in the present work. One of the parameters considered is a number of curing days for measuring the compressive strength. The measured results demonstrate the increase in compressive....

Traditional ways of delivering lectures in classrooms proved to be inadequate and inefficient. Recently, the education sector is witnessing a dramatic progress and is undergoing a major shift. This shift has been influenced largely by technological and pedagogical trends and the greater worldwide access to the Internet. Videos were seen to be a maj...

This work aims at utilizing natural resources and recycling materials from aircraft industries to enable their usage in medical and purification applications. The main application for which the materials are tested is the adsorption of bilirubin toxin from the liver of end stage liver failure patients. The two materials of concern are date seeds an...

Abstract—Nowadays, booming in 3D printing technology has invaded the world through different directions and aspects. Although the 3D printers are available in cheap prices for table models to enhance students grasp and creativity, still adopting 3D printing concepts in education is quite challenging due to many reasons. In this paper, the 3D printi...

The electronic structures and magnetic properties of K2O and Rb2O alloys doped simultaneously with Cr and V transition elements were investigated using the full-potential linearized augmented plane wave plus local orbital (FP-LAPW + lo) method within the spin-polarized density functional theory (Spin-DFT) and implemented in the WIEN2k package, wher...

The aim of this work was to develop activated carbon (AC) from date pit powder and evaluate its adsorption efficiency of bilirubin toxin. In order to increase the adsorption capacity of bilirubin, an increase in the surface area is necessary. This increase was achieved through pyrolysis technique and to further increase the absorption capacity of A...

Nowadays, booming in 3D printing technology has invaded the world through different directions and aspects. Although the 3D printers are available in cheap prices for table models to enhance students grasp and creativity, still adopting 3D printing concepts in education is quite challenging due to many reasons. In this paper, the 3D printing innova...

Concrete is considered as brittle materials and widely used due to high compressive strength but unfortunately having and has low tensile strength that has a numerous negative impacts on the lifespan of concrete made structures. Therefore, mechanical properties of cement mortar have been investigated experimentally using different types and ratios...

In the present study, the structural, thermal, and electronic properties of some important orthosilicate dielectrics, such as the ZrSiO4, ZrGeO4, and HfSiO4 compounds, have been investigated theoretically with the use of first-principle calculations. We attribute the application of the modified Becke–Johnson exchange potential, which is basically a...

E-learning pedagogy is one of the most recent methods used by instructors in the undergraduate level at the colleges worldwide. Students benefit from e-learning instruction by having better grasp of information. In the present work, e-learning was used in a postgraduate course in the College of Engineering at UAE University to motivate students in...

In this paper, spin-polarized density functional calculations on the structural, electronic, optical and magnetic properties of the zincblende structure of the Zn1−xVxS and Cd1−xVxS alloys at x = 0.25 in the ferromagnetic (FM) ordering has been investigated. The study is accomplished using the full-potential (FP) linearized augmented plane wave plu...

One of the main challenges for building designs is to provide comfort to its occupants at a low cost. The present investigation aims to study the performance of a ferrocement cavity wall under heating by means of applying direct fire to two ferrocement leaves with a space in between to be filled with insulation material. The main parameters conside...

Cu2Zn0.8Cd0.2SnS4 quinternary alloy nanostructures were prepared with different copper (Cu) concentrations; 0.3, 0.5, 0.7 and 0.9 mol/L using the spin coating technique. The direct band gap energy of Cu2Zn0.8Cd0.2SnS4 quinternary alloy nanostructures is investigated to decrease as Cu increases. The transmittance value in the range 63–49% is dependi...

Due to its distinguished properties especially being isotropic, particulate reinforced composite is considered as one of the attractive material for wide range of applications, where the relatively low manufacturing cost is a desirable advantage. In the present analysis, deteriorated particles embedded in particulate reinforced composite have been...