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2020

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Articles 541 - 570 of 10640

Full-Text Articles in Engineering

Hardware Development For The Generation Of Large-Volume High Pressure Plasma By Spatiotemporal Control Of Space Charge, Nikhil Boothpur Dec 2020

Hardware Development For The Generation Of Large-Volume High Pressure Plasma By Spatiotemporal Control Of Space Charge, Nikhil Boothpur

Electrical & Computer Engineering Theses & Dissertations

While generating a plasma under laboratory conditions, any attempt to scale the pressure and volume leads to instabilities due to the build-up of localized space-charge. This poses a challenge in the design of the discharge chamber, type of excitation field, and the type of gas that is used in the discharge. This work investigates a spatially and temporally varying electric field to control the formation of space-charge in large-volume (greater than 5 mm in the smallest dimension) near atmospheric pressure. The simulations show that in a space-charge dominated transport, the charged species disperse both in azimuthal and radial directions in …

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Enhanced Traffic Incident Analysis With Advanced Machine Learning Algorithms, Zhenyu Wang Dec 2020

Enhanced Traffic Incident Analysis With Advanced Machine Learning Algorithms, Zhenyu Wang

Computational Modeling & Simulation Engineering Theses & Dissertations

Traffic incident analysis is a crucial task in traffic management centers (TMCs) that typically manage many highways with limited staff and resources. An effective automatic incident analysis approach that can report abnormal events timely and accurately will benefit TMCs in optimizing the use of limited incident response and management resources. During the past decades, significant efforts have been made by researchers towards the development of data-driven approaches for incident analysis. Nevertheless, many developed approaches have shown limited success in the field. This is largely attributed to the long detection time (i.e., waiting for overwhelmed upstream detection stations; meanwhile, downstream stations …

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Conical Orbital Mechanics: A Rework Of Classic Orbit Transfer Mechanics, Cian Anthony Branco Dec 2020

Conical Orbital Mechanics: A Rework Of Classic Orbit Transfer Mechanics, Cian Anthony Branco

Mechanical & Aerospace Engineering Theses & Dissertations

Simple orbital maneuvers obeying Kepler’s Laws, when taken with respect to Newton’s framework, require considerable time and effort to interpret and understand. Instead of a purely mathematical approach relying on the governing relations, a graphical geometric conceptual representation provides a useful alternative to the physical realities of orbits. Conic sections utilized within the full scope of a modified cone (frustum) were employed to demonstrate and develop a geometric approach to elliptical orbit transformations. The geometric model in-question utilizes the rotation of a plane intersecting the orbital frustum at some angle β (and the change in this angle) in a novel …

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A Parametric Analysis Of A Turbofan Engine With An Auxiliary Bypass Combustion Chamber – The Turboaux Engine, Kaleab Fetahi Dec 2020

A Parametric Analysis Of A Turbofan Engine With An Auxiliary Bypass Combustion Chamber – The Turboaux Engine, Kaleab Fetahi

Mechanical & Aerospace Engineering Theses & Dissertations

A parametric study of a novel turbofan engine with an auxiliary combustion chamber, nicknamed the TurboAux engine is presented. The TurboAux engine is conceived as an extension of a low-bypass turbofan engine with an auxiliary bypass annular combustion chamber around the core stream. The study presented in this thesis is motivated by the need to facilitate clean secondary burning of fuel at temperatures higher than conventionally realized, from air exiting the low-pressure compressor. The parametric study starts by analyzing the turbojet engine and its performance with and without an afterburner segment attached. Following that, the conventional turbofan and its mixing …

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Detailed Modeling Of The Flash Hydrolysis Of Algae For Biofuel-Production In Comsol Multiphysics, Noah Joseph Legrand Dec 2020

Detailed Modeling Of The Flash Hydrolysis Of Algae For Biofuel-Production In Comsol Multiphysics, Noah Joseph Legrand

Mechanical & Aerospace Engineering Theses & Dissertations

Algae-derived biofuels are being commercialized as an important renewable energy source. Like any new technology, conversion improvements are desired, including reductions in process complexity and better utilization of the entire microalgae feedstock. The Old Dominion Biomass Laboratory has focused on flash hydrolysis for algae biofuel production. That process involves rapidly heating algae and water mixed as a slurry to a subcritical state. Results from small-scale bench tests are promising, but process scale up is a challenge. Currently there exists a pilot laboratory scale system utilizing induction heating in order to reach controlled reaction temperatures with a reaction duration of 10 …

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Space-Based Countermeasure For Hypersonic Glide Vehicle, Robert Joseph Fowler Iv Dec 2020

Space-Based Countermeasure For Hypersonic Glide Vehicle, Robert Joseph Fowler Iv

Mechanical & Aerospace Engineering Theses & Dissertations

The purpose of this thesis is to investigate the effectiveness of a space-based laser weapon system for countering a hypersonic glide vehicle. Hypersonic glide vehicles are an emerging type of weapon system which combine the range of ballistic missiles with the maneuverability of cruise missiles. These systems pose a unique threat to military assets not only for their expanded capabilities but also for the lack of an effective defensive countermeasure. Space-based laser weapon systems may offer a solution to this problem. The dynamics of a space-based laser system defending against a hypersonic glide vehicle are modeled first. The governing equations …

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Investigating The Presence Of Culture In Engineering Design: A Case Study On Culture In Design Methods, Perception, And Outcomes, Malena Ataa Durowaah Agyemang Dec 2020

Investigating The Presence Of Culture In Engineering Design: A Case Study On Culture In Design Methods, Perception, And Outcomes, Malena Ataa Durowaah Agyemang

All Dissertations

Overwhelming global statistics on economic, social, and health disparities has driven engineers and designers to develop solutions to minimize these disparities [1,2,11,12,3–10]. For the scope of this study, these efforts are referred to as design for humanitarian engineering and global development (HEGD). HEGD solutions are designed to improve access to medical technologies, energy, clean water, and even spark economic development [1–10]. However, many HEGD solutions go unadopted, halting their intended benefits [9,13,22,23,14–21]. Efforts to improve HEGD adoption have focused on ways to incorporate culture in the design solution’s aesthetics or in approaches post-deployment [24,25,34,35,26–33]. However, a review of failed HEGD …

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A Finite State Automata-Based Description Of Device States For Function Modeling Of Multi-State Technical Devices, Ahmed Mohammed Sobhan Chowdhury Dec 2020

A Finite State Automata-Based Description Of Device States For Function Modeling Of Multi-State Technical Devices, Ahmed Mohammed Sobhan Chowdhury

Theses and Dissertations

Many modern and innovative design problems require multi-modal, reconfigurable solutions. Function modeling (FM) is a common tool used to explore solutions in early stages of mechanical engineering design. Currently, function structure representations do not abet the modeling of formally-defined reconfigurable function models as graph-based function models used in early-stage systems design usually represent only one operational mode of the system. Currently there is a need, but no rigorous formalism to model multiple possible modes in the model and logically predict the behavior of the system as it transitions between the modes. Additionally, function modeling representations will benefit from dynamically capturing …

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Development Of A Self-Powered Weigh-In-Motion System, Athanassios Papagiannakis, Athanassios Papagiannakis, Samer Dessouky, Sara Ahmed, Reza Khalili, Gopal Vishwakarma Dec 2020

Development Of A Self-Powered Weigh-In-Motion System, Athanassios Papagiannakis, Athanassios Papagiannakis, Samer Dessouky, Sara Ahmed, Reza Khalili, Gopal Vishwakarma

Data

This report describes the development of a novel weigh-in-motion (WIM) system that utilizes piezoelectric elements for sensing load and powering an ultra-low power microcontroller unit (MCU) that serves as its data acquisition system. A system of 4 piezoelectric (PZT) stacks serves as the energy harvester, while load sensing is done via a set of 4 PZT elements connected in parallel. Two alternative MCUs were considered, with various data handling capabilities and power consumption requirements. These MCUs have very short “wake-up” times allowing vehicle sensing without the need for inductive loops commonly used in conventional WIM systems. Special electric circuits were …

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Improving Tolerance Control On Modular Construction Project With 3d Laser Scanning And Bim: A Case Study Of Removable Floodwall Project, Huimin Li, Chengyi Zhang, Siyuan Song, Sevilay Demirkesen, Ruidong Chang Dec 2020

Improving Tolerance Control On Modular Construction Project With 3d Laser Scanning And Bim: A Case Study Of Removable Floodwall Project, Huimin Li, Chengyi Zhang, Siyuan Song, Sevilay Demirkesen, Ruidong Chang

Faculty Publications

Quality control is essential to a successful modular construction project and should be enhanced throughout the project from design to construction and installation. The current methods for analyzing the assembly quality of a removable floodwall heavily rely on manual inspection and contact-type measurements, which are time-consuming and costly. This study presents a systematic and practical approach to improve quality control of the prefabricated modular construction projects by integrating building information modeling (BIM) with three-dimensional (3D) laser scanning technology. The study starts with a thorough literature review of current quality control methods in modular construction. Firstly, the critical quality control procedure …

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Dynamic Friction Measurements Of Egyptian Cotton Yarns Part 2: Study Of Frictional Behavior Of Plyed Yarns., M. Salama, R. El-Bealy, S. Ibrahim Dec 2020

Dynamic Friction Measurements Of Egyptian Cotton Yarns Part 2: Study Of Frictional Behavior Of Plyed Yarns., M. Salama, R. El-Bealy, S. Ibrahim

Mansoura Engineering Journal

In this work the frictional properties of single and plyed yarns were studied. The yarn coefficient of friction was found to be affected by the sliding speed over guides, yarn count and guide diameter. The method of twisting (ring or two-for-one) was also found to have a substantial influence on the friction behavior of plyed yarns.

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Understanding Radiation Resistance In Head And Neck Tumor Xenografts Using Diffuse Reflectance And Raman Spectroscopy, Sina Dadgar Dec 2020

Understanding Radiation Resistance In Head And Neck Tumor Xenografts Using Diffuse Reflectance And Raman Spectroscopy, Sina Dadgar

Graduate Theses and Dissertations

Each year, 800,000 new patients are diagnosed with head and neck squamous cell carcinoma (HNSCC), a majority of whom are treated with a combination of daily fractions of radiation and weekly chemotherapy sessions for up to seven weeks. Current methods to evaluate treatment response of individual patients are limited to anatomical measurements of tumor burden using CT scan or MRI 4-8 weeks after completion of treatment. However, earlier knowledge of radiation-response prior to or at early days after commencement of therapy can aid oncologist with escalating and de-escalating treatment plans for exceptionally non-responding and responding patients. Such a knowledge can …

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Leading Change During The Convergence Of An Epidemic And A Pandemic, Sarah Oerther, Daniel B. Oerther Dec 2020

Leading Change During The Convergence Of An Epidemic And A Pandemic, Sarah Oerther, Daniel B. Oerther

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

As the first wave of COVID-19 cases spread around the globe in early 2020, the healthcare community adopted a medical model that emphasized the use of resources to mitigate viral spread (Oerther & Watson, 2020). Schools, churches, and businesses shutdown, and healthcare facilities – from outpatient clinics to inpatient elective surgeries – were closed or cancelled. Even long-term care facilities, such as nursing homes, limited access of visitors to patients in an attempt at mitigation. And for six months, the healthcare community focused almost exclusively on a medical response to COVID-19, securing stockpiles of ventilators and fast-tracking vaccine development.

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Microglia Control Vascular Architecture Via A Tgfβ1 Dependent Paracrine Mechanism Linked To Tissue Mechanics, Tejasvi Dudiki, Julia Meller, Gautam Mahajan, Huan Liu, Irina Zhevlakova, Samantha Stefl, Conner Witherow, Eugene Podrez, Chandrasekhar R. Kothapalli, Tatiana V. Byzova Dec 2020

Microglia Control Vascular Architecture Via A Tgfβ1 Dependent Paracrine Mechanism Linked To Tissue Mechanics, Tejasvi Dudiki, Julia Meller, Gautam Mahajan, Huan Liu, Irina Zhevlakova, Samantha Stefl, Conner Witherow, Eugene Podrez, Chandrasekhar R. Kothapalli, Tatiana V. Byzova

Chemical & Biomedical Engineering Faculty Publications

© 2020, The Author(s). Tissue microarchitecture and mechanics are important in development and pathologies of the Central Nervous System (CNS); however, their coordinating mechanisms are unclear. Here, we report that during colonization of the retina, microglia contacts the deep layer of high stiffness, which coincides with microglial bipolarization, reduction in TGFβ1 signaling and termination of vascular growth. Likewise, stiff substrates induce microglial bipolarization and diminish TGFβ1 expression in hydrogels. Both microglial bipolarization in vivo and the responses to stiff substrates in vitro require intracellular adaptor Kindlin3 but not microglial integrins. Lack of Kindlin3 causes high microglial contractility, dysregulation of ERK …

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Proportional Voting Based Semi-Unsupervised Machine Learning Intrusion Detection System, Yang G. Kim, Ohbong Kwon, John Yoon Dec 2020

Proportional Voting Based Semi-Unsupervised Machine Learning Intrusion Detection System, Yang G. Kim, Ohbong Kwon, John Yoon

Publications and Research

Feature selection of NSL-KDD data set is usually done by finding co-relationships among features, irrespective of target prediction. We aim to determine the relationship between features and target goals to facilitate different target detection goals regardless of the correlated feature selection. The unbalanced data structure in NSL-KDD data can be relaxed by Proportional Representation (PR). However, adopting PR would deny the notion of winner-take-all by attracting a majority of the vote and also provide a fairly proportional share for any grouping of like-minded data. Furthermore, minorities and majorities would get a fair share of power and representation in data structure …

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Atherosclerosis: Pathology, Role Of Sd-Ldl, Particle Size Characterization Of Sd-Ldl With Multiangle Light Scattering, Akshay Sudhakar Ukey Dec 2020

Atherosclerosis: Pathology, Role Of Sd-Ldl, Particle Size Characterization Of Sd-Ldl With Multiangle Light Scattering, Akshay Sudhakar Ukey

Masters Theses

Atherosclerosis is an inflammatory disease due to the accumulation of lipids in the inner wall of arteries. As per the report of Center of Diseases Control and Prevention (CDC), 1 in every 4 deaths is due to heart diseases each year. Atherosclerosis occurs when artery walls harden by the buildup of cholesterol, forming multiple atherosclerotic plaques within the aorta (4). Out of the modern medicines available to control cholesterol, statin is amongst the foremost widely used because it is both safe and effective in lowering high risk patients (9). However, usage of high statins dosage typically leads to some mild …

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Fluid Modeling And Analysis Of A Mash Tl-6 Vehicle Model, Elisa Vasquez Dec 2020

Fluid Modeling And Analysis Of A Mash Tl-6 Vehicle Model, Elisa Vasquez

Department of Mechanical and Materials Engineering: Dissertations, Theses, and Student Research

The objective of this research project was to replicate the dynamic behavior of a truck-tank trailer combination vehicle using representative dimensions, properties, and inertias of the trailer/fluid ballast combination. A literature review was completed describing techniques for modeling fluids and fluid-container interactions using finite element analysis. Various fluid modeling techniques were identified, and parameters associated with those models were archived. Next, researchers utilized the tank geometry of the elliptical straight-frame 5949 trailer produced by LBT Inc. to generate a finite element mesh using finite element analysis preprocessors HyperMesh and LS PrePost. Material properties were taken from reference guides, research papers, …

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Dc-Dc Buck-Boost Converter Design For Energy Harvesting From Exercise Equipment, Nicholas Serres Dec 2020

Dc-Dc Buck-Boost Converter Design For Energy Harvesting From Exercise Equipment, Nicholas Serres

Electrical Engineering

This project aims to improve energy harvesting efficiency from an exercise machine. Exercise machine energy harvesting has a small immediate impact but can eventually have an immense impact. An elliptical exercise machine energy converter outputs 5V-60V whereas the microinverters require approximately 36V. The buck boost DC-DC converter bridges the gap between the microinverter and the elliptical machine. Increasing the buck-boost controller efficiency increases power production. Greater power efficiency gives the whole system more financial viability, and additionally makes it a greater sustainable energy source.

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Programmable Battery Management System, Jason Erbert Dec 2020

Programmable Battery Management System, Jason Erbert

Electrical Engineering

Lithium batteries provide excellent energy storage capabilities at a relatively high density; however, precautions must be taken with these high energy devices to ensure safe operation. A battery management system (BMS) provides protection by monitoring cell and pack voltage levels and maintaining them in a specific range. They limit the output current and disable the output in extreme conditions. Most devices in the targeted power range (<1000W) do not allow the user to manipulate the values for maximum current, cut-off voltage, or other limits. This project introduces the Programmable BMS (PBMS), which instead allows the user to select these values through a physical interface. The interface displays measurements including pack voltage and output current, and it reports additional characteristics of interest such as the battery’s temperature, state of charge, and cumulative number of charge cycles. This level of access and control permits users to receive the maximum performance and safety from common lithium battery packs.

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Phonetic Algorithm Performance, Aaron Schneidereit Dec 2020

Phonetic Algorithm Performance, Aaron Schneidereit

Senior Honors Projects

AARON SCHNEIDEREIT (Computer Science BS) Phonetic Algorithm Performance Sponsors: Noah Daniels (Computer Science and Statistics) Phonetic Algorithms are used for classifying words based on their pronunciation. These algorithms are used in many text-to-speech technologies and spell-checkers to ensure that a word can be correctly recognized despite minor spelling/pronunciation errors. The process of encoding a word to its phonetic surname is known as Phonetic Matching. Since 1918, there have only been a handful of phonetic algorithms that have been created. The main three algorithms that other phonetic algorithms are built from are Soundex, New York State Identification and Intelligence System (NYSIIS), …

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Quenched And Tempered High Strength Steel:A Review, Gadadhar Sahoo, Krishna Kumar Singh, Vinod Kumar Dec 2020

Quenched And Tempered High Strength Steel:A Review, Gadadhar Sahoo, Krishna Kumar Singh, Vinod Kumar

Journal of Metals, Materials and Minerals

Quenched and tempered steel are broadly classified as low alloy conventional grades with C contentof 0.15-0.40% and tool steels with C content as high as 2% alloyed with strong carbide forming elementssuch as Cr, V, Mo etc. in the range of 1-12%. In both the cases, steels are used in hardened/quenchedand tempered or auto tempered condition for improved toughness, strength and wear resistance. The C content and tempering temperature are optimized based on desired application. However, achieving high strength/hardness along with adequate toughness is a challenge. The chemistry designis one of the important parts of developing these grades. The judicious …

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Characterization Of Tio2-Activated Carbon Onto Adsorption And Photocatalytic Propertiesand Its Application, Mark Chobchun, Pasakorn Jutakridsada, Puttiporn Thiamsinsangwon, Pornnapa Kasemsiri, Khanita Kamwilaisak, Prinya Chindaprasirt Dec 2020

Characterization Of Tio2-Activated Carbon Onto Adsorption And Photocatalytic Propertiesand Its Application, Mark Chobchun, Pasakorn Jutakridsada, Puttiporn Thiamsinsangwon, Pornnapa Kasemsiri, Khanita Kamwilaisak, Prinya Chindaprasirt

Journal of Metals, Materials and Minerals

This study investigates the characterization of TiO2in conjunction with activated carbon(AC) on its adsorption and photocatalytic properties. TiO2in theabsence and presence of AC were preparedby the sol-gel method. TiCl4was used as a precursor to reduce using acidic solution during preparationprocess. The effects of the amount of AC on the characteristics of composites were investigated. TGA technique was used to evaluate the amount of TiO2and AC in TiO2/AC composite. The adsorptionproperties of TiO2/AC were characterized using XRD, TEM, N2adsorption/desorption, FTIR and UV - Visdiffuse reflectance spectroscopy techniques. The photocatalytic activitiesof the composites were investigated by measuring the removal of acid dye. …

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Screen Printed Textile Electrodes Using Graphene And Carbon Nanotubes With Silver For Flexible Supercapacitor Applications, Norawich Keawploy, Radhakrishnan Venkatkarthick, Panyawat Wangyao, Jiaqian Qin Dec 2020

Screen Printed Textile Electrodes Using Graphene And Carbon Nanotubes With Silver For Flexible Supercapacitor Applications, Norawich Keawploy, Radhakrishnan Venkatkarthick, Panyawat Wangyao, Jiaqian Qin

Journal of Metals, Materials and Minerals

The eco-friendly conductive cotton textile is promising alternatives for the flexible substrates in wearable devices since the cotton is as an inexpensive natural fabric material and compatible in modern portable electronics with adequate electrical conductivity. In this work, flexible conductive cotton-based electrodes areprepared via a screen-printing method using the carbonaceous nanomaterialssuch as carbon nanotubes (CNTs) and graphene with an additional component of conductive silver (Ag) powder and textile ink. The prepared conductive cotton electrodes exhibit lower sheet resistance (<10Ω) along with superior mass loading (20-30mgcm-2). On the basis of the performance of cottonelectrodes prepared, an all-solid-state flexible supercapacitor device was successfully fabricated whichexhibits a high specific areal capacitance of 677.12 mFcm-2at 0.0125 mAcm-2 for a suitable electrodecomposition (60% of Ag and 40% CNTs) using a PVA-KOH gel electrolyte. The flexible device endures a stable electrochemical performance under severe mechanical deformation using differentbending angles (0, 30, 45, 60and 90) of the device and possesses excellent cyclic stability with the capacitance retention of ~80% even after 3000 CV cycles.

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The Usage Of Coal−Layered Double Oxide For Removal Of Toxic Dye Fromaqueous Solution, Pornnapa Tongchoo, Sonchai Intachai, Prakaidao Pankam, Chomponoot Suppaso, Nithima Khaorapapong Dec 2020

The Usage Of Coal−Layered Double Oxide For Removal Of Toxic Dye Fromaqueous Solution, Pornnapa Tongchoo, Sonchai Intachai, Prakaidao Pankam, Chomponoot Suppaso, Nithima Khaorapapong

Journal of Metals, Materials and Minerals

CoAl−layered double oxide derived from calcination of CoAl−layered double hydroxide at400Cfor 120 min, delivered the change in microstructure with increasing surface area. Spinel Co3O4was the majority in the product as confirmed by X-ray diffraction, and Fourier transform infrared andUV-visible spectroscopies. The calcined product, CoAl−layered double oxide resulted in significantadsorption capacity on dye removal superior to that of CoAl−layered double hydroxide. The adsorbed amounts of the diverse dyes increased as follows: methylene blue phenolphthaleinmethyl orange orange II. The adsorption affinity between adsorbent and dyes relied on electrostatic interaction and physical adsorption.

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Soldering Of Copper Using Graphene-Phosphoric Acid Gel, Gurudatt Puranik, Asis Sarkar, Nirankar Mishra, Sangam Chandrasekhar Gurumurthy, Shridhar Mundinamani Dec 2020

Soldering Of Copper Using Graphene-Phosphoric Acid Gel, Gurudatt Puranik, Asis Sarkar, Nirankar Mishra, Sangam Chandrasekhar Gurumurthy, Shridhar Mundinamani

Journal of Metals, Materials and Minerals

Soldering is a physical process in which one metal melts and joins the other to form a strong bond,which further helps in electron conduction and increases the mechanical strength in any electronic circuits. The present work demonstrates the development of graphene-based flux comprising of 2 g of graphene and 2 ml of phosphoric acid for the residue-free, high stability, durable, and two-stepsoldering of copper wire on to the surface of the copper-based printed circuit board. The soldering fluxcan be applied to the copper, and wire can be soldered in ambient conditions using commercial solderingiron at a standard soldering temperature of …

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Laser Powder Bed Fusion Of Ti6al4v Lattice Structures And Their Applications, Thywill Cephas Dzogbewu Dec 2020

Laser Powder Bed Fusion Of Ti6al4v Lattice Structures And Their Applications, Thywill Cephas Dzogbewu

Journal of Metals, Materials and Minerals

The study focused on producing lattice structures using rhombic and diagonal nodes and indicatingtheir logical biomedical and engineering applications. Laser powder bed fusion manufacturingtechnology a subset of additive manufacturing was used to manufacture the lattice structures with different struts geometry. Average elastic modulus value of 5.30.2 GPa was obtained for therhombic lattice structures and 5.10.1 GPa for the diagonal lattice structures. Generally, the mechanicalproperties of the lattice structures produced could be logically considered suitable for biomedical and engineering applications. The mechanical properties of the lattice structures could be fine-tunedfor a specific engineering or biomedical applications by varying the lattice properties …

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Preparation And Properties Of Fired Clay Bricks With Added Wood Ash, Anuwat Srisuwan, Supachai Sompech, Chiawchan Saengthong, Sukhontip Thaomola, Prinya Chindraprasirt, Nonthaphong Phonphuak Dec 2020

Preparation And Properties Of Fired Clay Bricks With Added Wood Ash, Anuwat Srisuwan, Supachai Sompech, Chiawchan Saengthong, Sukhontip Thaomola, Prinya Chindraprasirt, Nonthaphong Phonphuak

Journal of Metals, Materials and Minerals

This study was designed to determine the effects of wood ash on the physical and mechanical properties of fired clay bricks. The clay bricks were fabricated with the addition of 0, 4, 8, 12, and 16% by weight of wood ash. Strength development of brick was cased byfired at 900, 1000, and 1100°C for 40 min. The experimental results demonstrated that the physical property and strength of the fired clay bricks depend on the wood ash contentand firing temperature. Higher wood ash content affected an increase in porosity and water absorption, while the bulk density of the clay brickswas reduced. …

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Ultraviolet‐Shielding And Water Resistance Properties Of Graphene Quantum Dots/Polyvinyl Alcohol Composite-Based Film, Sutthipoj Wongrerkdee, Pichitchai Pimpang Dec 2020

Ultraviolet‐Shielding And Water Resistance Properties Of Graphene Quantum Dots/Polyvinyl Alcohol Composite-Based Film, Sutthipoj Wongrerkdee, Pichitchai Pimpang

Journal of Metals, Materials and Minerals

The Ultraviolet‐shielding (UV‐shielding) and water resistance properties of graphene quantum dots/polyvinyl alcohol (GQDs/PVA) composite-based film have been investigated. The GQDs/PVA composite-based films were fabricated with different GQDs concentrations of 0, 5, 10, 15, and 20 wt%. The optical property of GQDs was carried out by utilizing fluorescence spectroscopy. Characterizationsof GQDs/PVA composite-based films were performed byusing FT-IR spectroscopy, and UV-vis spectroscopy. It was found that GQDs exhibited the strongest excitation wavelength in the UV range. GQDs/PVA composite-based films offered an improved UV-shielding capacity when compared to PVA films and glass. Particularly, the GQDs/PVA composite-based film containing 20 wt% GQDs exhibited a …

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Impact Of Boron Carbide And Graphite Dual Particulates Addition On Wear Behavior Of A356 Alloy Metal Matrix Composites, Pankaj R. Jadhav, Madeva Nagaral, Shivakumar Rachoti, Jayasheel I. Harti Dec 2020

Impact Of Boron Carbide And Graphite Dual Particulates Addition On Wear Behavior Of A356 Alloy Metal Matrix Composites, Pankaj R. Jadhav, Madeva Nagaral, Shivakumar Rachoti, Jayasheel I. Harti

Journal of Metals, Materials and Minerals

The current work gives the detailed microstructural analysis and wear behaviour of aluminiumalloy A356 based metal matrix composite. Here, boron carbide (B4C) and graphite (Gr) particulates were used as reinforcing phase to develop A356/ 4 wt% B4C, A356/ 4 wt% Gr composites along with A356/ 4 wt% Gr/ 12 wt% B4C hybrid composites. The composites were developed by conventional stir casting method to improve the wear properties. The developed composites were subjected to scanning electron microscope (SEM) formicrostructural analysis and then to DUCOM made wear test assembly to know the dry sliding wear behaviour. The wear tests were conducted for …

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Influence Of Coconut Shell Powder Organic Reinforcement On Chemical, Microstructuraland Mechanical Properties Of Spark Plasma Sintered Ti-Ni Based Metal Matrix Composite, Peter Odetola, Abimbola Patricia Popoola, Emmanuel Ajenifuja, Olawale Popoola Dec 2020

Influence Of Coconut Shell Powder Organic Reinforcement On Chemical, Microstructuraland Mechanical Properties Of Spark Plasma Sintered Ti-Ni Based Metal Matrix Composite, Peter Odetola, Abimbola Patricia Popoola, Emmanuel Ajenifuja, Olawale Popoola

Journal of Metals, Materials and Minerals

Metal matrix composites (MMCs) are currently used in place of pure alloys and polymer matrix composites because of their unique physical properties. Titanium and nickel powders were alloyed with coconut shell powder (CSP) as organic compound reinforcement to form a TiNi-based metal matrix composite (MMC) using spark plasma sintering (SPS) technique. The powders were mild-milledfor 16 h and then axially consolidated at 850C, heating rate of 100Cmin-1and 50 MPa sintering pressure. Characterizations were done using field emission scanning electron microscope (FE-SEM-EDX) and x-ray diffractometer (XRD). Elemental and structural characterizations of the composites revealed the formation of the Ti-rich eutectic phase, …

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