Scientific Characterization Of Historic Mortars Dating From The 15th-Century Of A Historical Building In Algeria: A Case Study,
2025
University of Science and Technology Houari Boumedienne, USTHB, Algiers, Algeria
Scientific Characterization Of Historic Mortars Dating From The 15th-Century Of A Historical Building In Algeria: A Case Study, M. E. Belgacem, N. Rabahi-Touloum, R. Neves, Y. Ouldkhaoua
Journal of Sustainable Construction Materials and Technologies
This research investigates the historic mortars (Aggregate/Binder (A/B) ratio) of a historical patrimony building, dating from the 15th century, in Algeria, for restoration purposes. It is well known that thorough characterization is essential for successful restoration. To this end, several techniques, including Scanning Electron Microscopy (SEM), X-ray Diffraction (XRD), and X-ray Fluorescence (XRF), optical microscope were used to characterize the historic mortars. A mechanical test was used to characterize the compressive strength of a historic mortar. For a comprehensive characterization, A/B ratios were estimated using both Digital Image Analyses (DIA) and chemical analyses. The results obtained provided clear information on …
Analysis And Simulation Of The Effect Of Voids In Dually Reinforced Particle And Short Fiber Composites,
2025
Rose-Hulman Institute of Technology
Analysis And Simulation Of The Effect Of Voids In Dually Reinforced Particle And Short Fiber Composites, Matthew Mckinley Luci
Graduate Theses - Mechanical Engineering
This thesis investigates dual-reinforced polymer composites tailored for flywheel energy storage, combining short, chopped carbon fibers for load bearing with iron particulates for multifunctionality. A unified experimental–computational workflow was developed: tensile coupons were fabricated and tested, machine compliance was quantified using neat resin and removed from all curves, and elastic moduli were extracted with robust MATLAB routines. Parallel finite-element models in ANSYS 2023R reproduced the dog-bone geometry with standardized meshing, named selections, and displacement-controlled loading. Four material states—neat resin, resin and iron, resin and short carbon fiber, and the iron and fiber hybrid— were evaluated. Results show carbon fibers dominate …
Electromigration In Eutectic Gold-Tin (80au20sn-Wt%) Solder Joints,
2025
University of Arkansas, Fayetteville
Electromigration In Eutectic Gold-Tin (80au20sn-Wt%) Solder Joints, Whit Vinson, David Huitink
Mechanical Engineering Faculty Publications and Presentations
Eutectic gold-tin solder joints (80Au20Snwt%) with a diameter of 300 mu m diameter were subjected to electromigration (EM) conditions of 10,000-20,000 A/cm2 in the ambient temperature range of 125-215 degrees C. The present work examines a set of 36 experimental test runs using two different test coupons (18 runs with each coupon type and a total of 90 joints tested). Seven of the 36 coupons survived the maximum test duration period of 500 h. One coupon type created a linear electric current pathway through two lengths of 254-mu m-diameter copper wire connected by a single gold-tin joint. The other coupon …
Cal Poly (Cp) Legged Robot,
2025
California Polytechnic State University, San Luis Obispo
Cal Poly (Cp) Legged Robot, Sebastian Barboza, Jonathan Mchale, Isabella Sorensen, Isaac Golan
Mechanical Engineering
The Navy spends $60 billion annually on dangerous ship maintenance performed by sailors. To save lives and resources, the Naval Surface Warfare Center (NSWC) is looking for robots to replace sailors and navigate ships to perform various tasks. Robots with tracks and wheels have been most recently explored by NSWC, however they have encountered significant problems navigating the ships, especially through naval ship doorways with a significant ledge. By using a legged robot, our team hopes to solve these problems and have a robot that can navigate the ship with relative ease and stability.
Examining The Perception Of Maritime Instructors In Upskilling And Reskilling Seafarers Towards Decarbonization,
2025
World Maritime University
Examining The Perception Of Maritime Instructors In Upskilling And Reskilling Seafarers Towards Decarbonization, Michelle Margallo
World Maritime University Dissertations
No abstract provided.
Environmental Regulations And The Exploitation Of Deep Seabed Minerals : A New Era For The“Mining Code” Of The International Seabed Authority (Isa)?,
2025
World Maritime University
Environmental Regulations And The Exploitation Of Deep Seabed Minerals : A New Era For The“Mining Code” Of The International Seabed Authority (Isa)?, Mikyla D'Antoinette Frederick-Winter
World Maritime University Dissertations
No abstract provided.
Human Element And Emerging Technologies : Imo Efforts To Address The Impact Of Digitalization In The Context Of Automation On Board,
2025
World Maritime University
Human Element And Emerging Technologies : Imo Efforts To Address The Impact Of Digitalization In The Context Of Automation On Board, Eduardo Matías Hidalgo Bassi
World Maritime University Dissertations
No abstract provided.
Assessing Marpol Annex V Port Reception Facilities Of The National Port Of Liberia (Freeport Of Monrovia),
2025
World Maritime University
Assessing Marpol Annex V Port Reception Facilities Of The National Port Of Liberia (Freeport Of Monrovia), Barbara Wade Cummings
World Maritime University Dissertations
No abstract provided.
Intelligent Real-Time Flotation Froth Stability Monitoring Using Embedded Computer Vision: Lead (Pb) Processing Case Study,
2025
The University of Texas Rio Grande Valley
Intelligent Real-Time Flotation Froth Stability Monitoring Using Embedded Computer Vision: Lead (Pb) Processing Case Study, Ahmed Bendaouia, Taha Ismaili, Ismail Najib, Oussama Hasidi, Intissar Benzakour, Jianzhi Li, El Hassan Abdelwahed
Manufacturing & Industrial Engineering Faculty Publications
Froth stability in flotation refers to the ability of the froth layer to remain intact and avoid collapsing during the flotation process. A stable froth layer is crucial to maximizing mineral recovery and ensuring the efficient operation of flotation cells. Several factors influence the stability of the froth, including the depth of the froth, the crowding, the size of the bubbles, and the rate of movement of the froth. In this study, our main objective is to analyze and evaluate froth stability in real time, since it plays a critical role in process optimization for flotation-based mineral processing. We propose …
Ded Printing Process Modeling Using Metal Matrix Composites: In-Situ Feedstock Mixing With Variable Compositions And Empirical Validation,
2025
Missouri University of Science and Technology
Ded Printing Process Modeling Using Metal Matrix Composites: In-Situ Feedstock Mixing With Variable Compositions And Empirical Validation, Muhammad Arif Mahmood, Sabin Mihai, Diana Chioibasu, Andrei C. Popescu, Frank Liou
Mechanical and Aerospace Engineering Faculty Research & Creative Works
Directed Energy Deposition (DED) is a promising technology for producing metal matrix composites (MMXCs), but precise control over deposited layer dimensions, particularly in multi-material systems, remains difficult to achieve due to the complex interdependence of operating parameters such as laser parameters, feedstock flow rate, and beam energy attenuation. To address these problems, this work proposes an analytical model that predicts the width, height, and depth of the deposited layers using mixed feedstock compositions in-situ, with a focus on Inconel-718 and TiC MMXCs. The model takes into account variables such as laser power, feedstock density, and mixing ratios to improve layer …
Bending Fatigue In Additively Manufactured Metals: A Review Of Current Research And Future Directions,
2025
Missouri University of Science and Technology
Bending Fatigue In Additively Manufactured Metals: A Review Of Current Research And Future Directions, Md Bahar Uddin, Sriram Praneeth Isanaka, Frank Liou
Mechanical and Aerospace Engineering Faculty Research & Creative Works
Metal additive manufacturing (MAM), also referred to as 3D printing, has proven remarkable in the fabrication of complex metal components in multiple sectors. However, the assessment of this revolutionary process through bending fatigue is frequently impeded due to concerns about mechanical and physical conditions of the printed components. The unique layer-by-layer production process results in varied microstructures, anisotropy, and intrinsic defects that considerably differ from traditionally manufactured wrought metals. This review article aims to integrate and evaluate historical and contemporary research on the bending fatigue of additively manufactured materials. More specifically, the impact of process parameters, build orientation, surface conditions, …
Powder Bed Fusion Of Stainless Steel 304l-Nbc Nanocomposite Produced By Ball Milling Method Using A Laser Beam,
2025
Missouri University of Science and Technology
Powder Bed Fusion Of Stainless Steel 304l-Nbc Nanocomposite Produced By Ball Milling Method Using A Laser Beam, Khalid Hussain Solangi, Junaid Iqbal Bhatti, Irfan Ali Tunio, Imdad Ali Memon, Temoor Abbas Larik, Lianyi Chen
Mechanical and Aerospace Engineering Faculty Research & Creative Works
Metal powders with uniformly dispersed nanoparticles, suitable shape, and size for additive manufacturing (AM) processes are highly demanded. However, it is difficult to manufacture metal matrix nanocomposite powders (MMNCs) with uniform dispersion of nanoparticles, optimized shape, and size. This study used high-energy ball milling to disperse NbC nanoparticles with an average length of 400 nm (ex-situ reinforcement) in a Stainless Steel (SS) 304 L matrix. In detail, SS304L-5wt% NbC powders were ball-milled from 4 to 10 h. The results showed that the milled powder particles experienced significant cold-welding during the milling time of 4–6 h, with a wide size distribution. …
Marine Environmental Protection : An Investigation Into Existing Global Laws Addressing Marine Plastic Pollution,
2025
World Maritime University
Marine Environmental Protection : An Investigation Into Existing Global Laws Addressing Marine Plastic Pollution, Maryland De Castro
World Maritime University Dissertations
No abstract provided.
Assessment Of Recreational Safety Protocols In Philippine Beaches And Resorts : A Coast Guard Perspective,
2025
World Maritime University
Assessment Of Recreational Safety Protocols In Philippine Beaches And Resorts : A Coast Guard Perspective, Jazzyneth Cacnio
World Maritime University Dissertations
No abstract provided.
Integrating Environmental Impact Assessment Into International Shipping Governance : A Bbnj-Pssa Synergy Framework,
2025
World Maritime University
Integrating Environmental Impact Assessment Into International Shipping Governance : A Bbnj-Pssa Synergy Framework, Thi Thuy Linh Pham
World Maritime University Dissertations
No abstract provided.
Occupational Safety In Fishing Vessels : A Comparative Analysis Of Namibia, South Africa And Mozambique In The Sadc Region,
2025
World Maritime University
Occupational Safety In Fishing Vessels : A Comparative Analysis Of Namibia, South Africa And Mozambique In The Sadc Region, Fiina Ndakulilwa Twiihaleni Shaanika
World Maritime University Dissertations
No abstract provided.
Optimization Of Aids To Navigation System In Papua New Guinea,
2025
World Maritime University
Optimization Of Aids To Navigation System In Papua New Guinea, Justus Wayne
World Maritime University Dissertations
No abstract provided.
An Assessment Of The Impact Of Illegal Sand Mining On The Coastline Of Liberia,
2025
World Maritime University
An Assessment Of The Impact Of Illegal Sand Mining On The Coastline Of Liberia, Alphena J. Logan
World Maritime University Dissertations
No abstract provided.
The Role Of Atmospheric Turbulence On Cloud Droplet Distribution And Droplet Impaction On An Airfoil,
2025
The University of Texas Rio Grande Valley
The Role Of Atmospheric Turbulence On Cloud Droplet Distribution And Droplet Impaction On An Airfoil, Arash Shad, Hashnayne Ahmed, Nadim Zgheib, S. Balachandar, S. A. Sherif
Mechanical Engineering Faculty Publications
We conduct turbulence-informed Euler–Lagrange simulations of droplet-laden flow to examine the effects of atmospheric turbulence on droplet impingement characteristics on a NACA 0012 airfoil. We implement statistical overloading, whereby we inject millions of droplets, ranging in diameter from 1 to 160 microns, upstream of the airfoil at an average streamwise velocity of 120 m/s. Within a fraction of a second, these droplets would have either impinged on the airfoil or continued downstream. While the incoming air flow is maintained uniform, droplet injection is informed by ambient turbulence, affecting both the droplet velocity distribution as well as the size-dependent preferential concentration …
Experimental Investigation: Performance Of Ranque–Hilsch Vortex Tubes Under Various Surface Boundary Conditions,
2025
United Arab Emirates University
Experimental Investigation: Performance Of Ranque–Hilsch Vortex Tubes Under Various Surface Boundary Conditions, Ahmad Al-Najjar
Theses
The Ranque–Hilsch vortex tube (RHVT) is a passive thermofluid device that splits compressed gas into simultaneous cold and hot streams through strong swirling flow inside a slender tube, without moving parts. This study experimentally examines how external boundary conditions applied to the tube wall influence RHVT performance. Three wall conditions were imposed: (i) externally cooled (cooling), (ii) externally heated (heating), and (iii) adiabatic (insulated). Tests were conducted with air over an inlet pressure range of 2–6 bar. The primary objective was to understand the extent to which wall thermal condition modifies temperature separation and energy efficiency. Performance was quantified using …
