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Articles 39391 - 39420 of 196021

Full-Text Articles in Engineering

What Drug Candidates Exist For Treating Covid-19 Variants?, Kolton Hauck Feb 2022

What Drug Candidates Exist For Treating Covid-19 Variants?, Kolton Hauck

Research on Capitol Hill

USU senior Kolton studies biological engineering and led this project with funding from a student grant. Kolton’s project has been mapping out all possible protein interactions from known SARS-CoV-2 variants and identifying possible drug treatments. Viruses function through these interactions between their proteins and the host cell’s proteins, and this project is especially valuable because the candidates identified are predicted to help treat all known variants, making them more likely to be effective against future mutations.Kolton’s interest in biological research stems from his own experience managing a genetic health disorder. Past medical research greatly benefited him, and he sees his …

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The Surface Conditions Of Spacecraft Panels May Significantly Affect Spacecraft Survivability, Trace Taylor Feb 2022

The Surface Conditions Of Spacecraft Panels May Significantly Affect Spacecraft Survivability, Trace Taylor

Research on Capitol Hill

USU junior Trace grew up in Brigham City and studies physics and electrical engineering. The majority of spacecraft failure is caused by electron charging on the outer surfaces of the craft. Additionally, contaminants on the craft can cause a film over surface panels, increasing the problem. Trace is studying how roughness on panels can mitigate this contamination as it affects the charging that can lead to craft failure. This research will help determine what optimal panel materials should be used in future spacecraft construction. Trace started research almost as soon as he came to campus in his freshman year, and …

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Can Cannibinoids Be Used To Prevent Lung Damage From Utah Air Pollution?, Emily Brothersen Feb 2022

Can Cannibinoids Be Used To Prevent Lung Damage From Utah Air Pollution?, Emily Brothersen

Research on Capitol Hill

USU senior Emily, a Mantua native, is an Honors student and Undergraduate Research Fellow. She studies Biological Engineering and has funded and led this project herself with multiple student grants. Emily has been investigating a way to study cell health that can help future researchers test treatments more quickly and affordably. She has used this method to research the potential of cannabinoids to help protect people from lung damage caused by pollution, an issue topical to Utah with our frequent inversions and growing medical cannabis industry. Emily has been involved in research throughout her time at USU and sees it …

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A Tale Of Two Sides: Modeling Great Salt Lake Flows To Help Balance Current Ecosystem Influences, Eric Larsen Feb 2022

A Tale Of Two Sides: Modeling Great Salt Lake Flows To Help Balance Current Ecosystem Influences, Eric Larsen

Research on Capitol Hill

USU senior Eric, hailing from Spanish Fork, studies mechanical engineering and funded this project through an engineering student grant. While there are several sampling stations that measure the waterflow of the Great Salt Lake, there are gaps in the data they collect that limit our ability to predict how water moves between the north and south sides of the lake. Eric has been developing machine learning models that more accurately portray the flows. This has applications for both GSL ecological preservation and the brine shrimp and salt industries. Eric loved how hands-on this project was, seeing the phenomenon that his …

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Storage Minimization Of Marine Energy Grids Using Polyphase Power, Salman Husain, Gordon Parker, Wayne W. Weaver Feb 2022

Storage Minimization Of Marine Energy Grids Using Polyphase Power, Salman Husain, Gordon Parker, Wayne W. Weaver

Michigan Tech Publications, Part 1

Multiple wave energy converter (WEC) buoys can be used to establish a WEC array-powered microgrid collectively forming a Marine Energy Grid (MEG). An oceanic domain with gravity waves will have significant spatial variability in phase, causing the power produced by a WEC array to have high peak-to-average ratios. Minimizing these power fluctuations reduces the demand for large energy storage by WEC array-powered DC microgrids while also reducing losses in the undersea cable to the shore. Designs that reduce energy storage requirements are desirable to reduce deployment and maintenance costs. This work demonstrates that polyphase power in conjunction with an energy …

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Geant4 Simulation For Radioactive Particle Tracking (Rpt) Technique, Ahmed A. Alghamdi, Thaar M. Aljuwaya, Abdullah S. Alomari, Muthanna H. Al-Dahhan Feb 2022

Geant4 Simulation For Radioactive Particle Tracking (Rpt) Technique, Ahmed A. Alghamdi, Thaar M. Aljuwaya, Abdullah S. Alomari, Muthanna H. Al-Dahhan

Chemical and Biochemical Engineering Faculty Research & Creative Works

In the past two decades, the radioactive particle tracking (RPT) measurement technique has been proven to visualize flow fields of most multiphase flow systems of industrial interest. The accuracy of RPT, and hence the data obtained, depend largely on the calibration process, which stands here as a basis for two subsequent processes: tracking and reconstruction. However, limitations in the RPT calibration process can be found in different experimental constrains and in assumptions made in the classical Monte Carlo approach used to simulate number of counts received by the detectors. Therefore, in this work, we applied a GEANT4-based Monte Carlo code …

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Understanding The Photodegradation Mechanism Of Gaseous Acetaldehyde Over Bi2wo6 – Modified Znwo4 Photocatalyst Under Uv Light Irradiation, Mirabbos Hojamberdiev, Ronald Vargas, Shahlo Daminova, Zuhra Kadirova Feb 2022

Understanding The Photodegradation Mechanism Of Gaseous Acetaldehyde Over Bi2wo6 – Modified Znwo4 Photocatalyst Under Uv Light Irradiation, Mirabbos Hojamberdiev, Ronald Vargas, Shahlo Daminova, Zuhra Kadirova

CHEMISTRY AND CHEMICAL ENGINEERING

Indoor air quality has a significant impact on human health as people spend more time indoors. As a common indoor air pollutant, acetaldehyde is considered toxic when exposed to it for a prolonged period. The aim of this study is the enhancement of the photocatalytic activity of ZnWO4 with a monoclinic wolframite structure for degradation of gaseous acetaldehyde by modifying its surface with Bi2WO6 layered structure. The mechanisms behind the enhanced photocatalytic activity and the pathways for acetaldehyde photodegradation over the Bi2WO6-modified ZnWO4 photocatalyst are discussed.

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Modelling Of Reаctive Distillаtion Process For Etherificаtion Reаction, Adham Norkobilov, Olimjon Mаksudov, Abdulaziz Bаkhtiyorov, Orifjon Zаripov, Abbos Elmаnov Feb 2022

Modelling Of Reаctive Distillаtion Process For Etherificаtion Reаction, Adham Norkobilov, Olimjon Mаksudov, Abdulaziz Bаkhtiyorov, Orifjon Zаripov, Abbos Elmаnov

CHEMISTRY AND CHEMICAL ENGINEERING

А reаctive distillаtion system is exаmined to produce for the production of Ethyl tert butyl ether (ETBE) viа etherificаtion of isobutene with ethаnol. Optimizаtion methods using heаt integrаtion аre аlso conducted. The molаr reflux rаtio аnd reboiler duty аre cаlculаted using sensitivity аnаlysis. The bottom streаm with the sаtisfied purity of ETBE is integrаted for heаting the feed streаm to the column. Heаt integrаtion from reаctor heаt to the initiаl feed streаm аnd from bottom streаm of the column to the column inlet streаm with the purpose of аchieving tаrget feed temperаture leаds to high conversion in the reаctive distillаtion …

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Study Of Various Quality Characteristics Of Polyester Fibers Obtained On The Basis Of Primary And Secondary Polyethylene Terephthalate, Samida Ernzarova, Asror Juraev, Muzaffar Alimukhamedov, Farhod Magrupov Feb 2022

Study Of Various Quality Characteristics Of Polyester Fibers Obtained On The Basis Of Primary And Secondary Polyethylene Terephthalate, Samida Ernzarova, Asror Juraev, Muzaffar Alimukhamedov, Farhod Magrupov

CHEMISTRY AND CHEMICAL ENGINEERING

The aim of study is comprehensive determination of various quality characteristics of polyester fibers obtained on the basis of primary and secondary polyethylene terephthalate. The analysis of the raw material base of pre-oriented yarns (POY) threads has been carried out. The technological, physicomechanical properties, as well as the structure of the primary and secondary polyethylene terephthalate used in the production of the threads have been studied. The structure and properties of polyethylene terephthalate changed: the properties were worse, the structure were amorphous, the molecular weight decreased. The structure of recycled polyethylene terephthalate changed as a result of technological conversions in …

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Мulti-Layer Fibrous Material Based On Textile Waste, Sevara Alimkhanova, Nodir Mirzaev, Adham Rafikov Feb 2022

Мulti-Layer Fibrous Material Based On Textile Waste, Sevara Alimkhanova, Nodir Mirzaev, Adham Rafikov

CHEMISTRY AND CHEMICAL ENGINEERING

At the textile and sewing and knitting enterprises of the Republic of Uzbekistan, the number of which increases every year, a sufficient amount of technological waste is accumulated, which formed in the processes of sizing yarn, starting and setting up equipment, designing and sewing products. Meanwhile, there is a shortage of warm, comfortable, light, soft lining materials for clothes and shoes based on natural raw materials. With the purpose of rational use of textile waste - shredded, disheveled scraps of fabric and knitwear, a multilayer nonwoven material for details of clothing and footwear has been obtained. The material formed by …

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Spectral Features And Hydrogen Bond Structure Of Aqueous Solutions Of Ethanol, Dilbar Bozorova, Shukur Gofurov, Mavlonbek Ziyayev, Abdulmutallib Kokhkharov, Oksana Ismailova Feb 2022

Spectral Features And Hydrogen Bond Structure Of Aqueous Solutions Of Ethanol, Dilbar Bozorova, Shukur Gofurov, Mavlonbek Ziyayev, Abdulmutallib Kokhkharov, Oksana Ismailova

CHEMISTRY AND CHEMICAL ENGINEERING

The aim of this work is develop an approach that makes it possible to study the spectral properties and structure of intermolecular hydrogen bonds in aqueous solutions of ethanol formed in systems whose existence in a gaseous medium or an isolated state is practically impossible. This approach bases on the combined use of infrared spectroscopy and molecular dynamics (MD) methods. An analysis give the structural reorganization of water molecules depending on the concentration of ethanol alcohol. It has been shown that the method of molecular dynamics with classical force fields makes it possible to explicitly take into account the molecules …

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Determination Of The Stability Of Complex Compounds Of Copper (Ii), Zinc (Ii), Cadmium (Ii) And Silver (I) With Covalently Immobilized Sulfur Contain Ligands, Sherzod Kasimov, Khayit Turaev, Abdulakhat Jalilov, Farkhod Narmuratov, Zulkhumor Jumayeva Feb 2022

Determination Of The Stability Of Complex Compounds Of Copper (Ii), Zinc (Ii), Cadmium (Ii) And Silver (I) With Covalently Immobilized Sulfur Contain Ligands, Sherzod Kasimov, Khayit Turaev, Abdulakhat Jalilov, Farkhod Narmuratov, Zulkhumor Jumayeva

CHEMISTRY AND CHEMICAL ENGINEERING

The purpose of this study is to determine the stability of the obtained coordination compounds of some d-metals with covalent immobilized sulfur-containing ligands. To achieve this goal, coordination compounds of copper (II), zinc (II), cadmium (II) and silver (I) ions with covalent immobilized sulfur-containing ligands - О,О-di- (2-aminoethyl) -dithiophosphate potassium - polyester matrix (KD2AEDTP-PEM), O,O-di- (2-aminoethyl) -dithiophosphate potassium - carbamide-formaldehyde matrix (KD2AEDTP-KFM). Studies were carried out to determine the acid-base properties of covalent-immobilized sulfur-containing ligands - KD2AEDTP-PEM, KD2AEDTP-KFM and the concentration stability of the obtained coordination compounds with ions of copper (II), zinc (II), cadmium (II), and silver (I). Based …

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Synthesis And Spectroscopic Study Of Complex Compounds Mn(Ii), Co(Ii), Cu(Ii) And Zn With 5-Amino-2-Mercaptobenzimidazole, Lobar Gapurova, Dilnoza Rakhmonova, Shakhnoza Kadirova Feb 2022

Synthesis And Spectroscopic Study Of Complex Compounds Mn(Ii), Co(Ii), Cu(Ii) And Zn With 5-Amino-2-Mercaptobenzimidazole, Lobar Gapurova, Dilnoza Rakhmonova, Shakhnoza Kadirova

CHEMISTRY AND CHEMICAL ENGINEERING

The aim of this work is to study the effect of the nature of electron-donor and electron-withdrawing substituents in the molecules of heterocyclic ligands, the nature of acidoligands and transition metal ions on the properties of the synthesized coordination compounds. A method for the synthesis of new complex compounds of Mn (II), Cо (II), Cu (II) and Zn with 5-amino-2-mercaptobenzimidazole has been developed and the composition and structure of the synthesized complex compounds have been studied using modern physicochemical methods, such as elemental, thermogravimetric, X-ray phase analysis and IR spectroscopy. Coordination competing donor centers, electronic and geometric structures of the …

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Resistance Of Polystyrol Concrete To Dynamic Impact Loads, Natalya Dubovitskaya, Zamira Mukhamedbaeva, Abduvali Mukhamedbaev Feb 2022

Resistance Of Polystyrol Concrete To Dynamic Impact Loads, Natalya Dubovitskaya, Zamira Mukhamedbaeva, Abduvali Mukhamedbaev

CHEMISTRY AND CHEMICAL ENGINEERING

The aim of the study is to increase the resistance of polystyrene concrete obtained from recycled polystyrene to dynamic shock loads. The issues of resistance of polystyrene concrete to compression forces with increasing load are considered. It was found that in terms of impact resistance, polystyrene concrete can be classified as a viscous material capable of absorbing high energy of shock loads. It has been determined that when Na2SO4 is introduced as a hardening accelerator, polystyrene concrete samples can absorb an impact energy of more than 178.5 J.

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Features Of The Formation Of The Coating Structure On Titanium-Based Alloys, Uchkun Rakhimov, Nasiba Abduraimova, Yulbarskhon Mansurov Feb 2022

Features Of The Formation Of The Coating Structure On Titanium-Based Alloys, Uchkun Rakhimov, Nasiba Abduraimova, Yulbarskhon Mansurov

CHEMISTRY AND CHEMICAL ENGINEERING

Previously shown that coatings formed on titanium by plasma electrolytic oxidation (PEO) in an electrolyte with zirconium sulfate Zr(SO4)2 consisted of ZrO2 and TiO2 oxides, their surface layer is enriched with zirconium, they have good protective properties in chlorine-containing media. The resulting layers have a fairly regular distribution of relatively small pores, with a diameter of about 1 μm or less, on the surface. The composition and structure of PEO layers depend on both the composition of the electrolyte and the modes of formation. It is of scientific and practical interest to elucidate the effect …

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Flexible Planar Metamaterials With Tunable Poisson’S Ratios, Nicholas Pagliocca, Kazi Zahir Uddin, Ibnaj Anamika Anni, Chen Shen, George Youssef, Behrad Koohbor Feb 2022

Flexible Planar Metamaterials With Tunable Poisson’S Ratios, Nicholas Pagliocca, Kazi Zahir Uddin, Ibnaj Anamika Anni, Chen Shen, George Youssef, Behrad Koohbor

Henry M. Rowan College of Engineering Departmental Research

This research reports on the design, fabrication, and multiscale mechanical characterization of flexible, planar mechanical metamaterials with tailorable mechanical properties. The tunable mechanical behavior of the structures is realized through the introduction of orthogonal perforations with different geometric features. Various configurations of the perforations lead to a wide range of Poisson’s ratios (from −0.8 to 0.4), load-bearing properties, and energy absorption capacities. The correlations between the configuration of the perforations and the auxetic response of the structures are highlighted through computational and experimental characterizations performed at multiple length scales. It is demonstrated that the local in-plane rotation of the solid …

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Design, Development, And Validation Of An Augmented Reality-Enabled Production Strategy Process, Hala Nassereddine, Dharmaraj Veeramani, Awad S. Hanna Feb 2022

Design, Development, And Validation Of An Augmented Reality-Enabled Production Strategy Process, Hala Nassereddine, Dharmaraj Veeramani, Awad S. Hanna

Civil Engineering Faculty Publications

The Production Strategy Process (PSP) is an integral part of production planning and control as it defines how production processes are structured and designed and outlines how production will be executed. PSP involves massive information transfer and communication among project participants. While BIM can improve the flow of information, the paradox of designing 3D models in 2D space remains. This paradox indicates that new visualization technologies are needed to leverage the use of information in the PSP. As Industry 4.0, the fourth industrial revolution, continues to evolve, it is imperative that construction firms seek, find, and adopt new technologies. This …

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Subomiembed: Self-Supervised Representation Learning Of Multi-Omics Data For Cancer Type Classification, Sayed Hashim, Muhammad Ali, Karthik Nandakumar, Mohammad Yaqub Feb 2022

Subomiembed: Self-Supervised Representation Learning Of Multi-Omics Data For Cancer Type Classification, Sayed Hashim, Muhammad Ali, Karthik Nandakumar, Mohammad Yaqub

Computer Vision Faculty Publications

For personalized medicines, very crucial intrinsic information is present in high dimensional omics data which is difficult to capture due to the large number of molecular features and small number of available samples. Different types of omics data show various aspects of samples. Integration and analysis of multi-omics data give us a broad view of tumours, which can improve clinical decision making. Omics data, mainly DNA methylation and gene expression profiles are usually high dimensional data with a lot of molecular features. In recent years, variational autoencoders (VAE) [13] have been extensively used in embedding image and text data into …

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Laboratory Evaluation Of Placement Behavior Of Microgels For Conformance Control In Reservoirs Containing Superpermeable Channels, Yang Zhao, Baojun Bai Feb 2022

Laboratory Evaluation Of Placement Behavior Of Microgels For Conformance Control In Reservoirs Containing Superpermeable Channels, Yang Zhao, Baojun Bai

Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works

Gel treatment has been proven an effective method to attack excessive water production in many mature oilfields. However, not all of the application projects have successful stories. The effectiveness of a gel treatment largely depends on the transport and placement behavior of gel materials in reservoirs to be treated. In this work, we carried out systematic studies to investigate the transport, placement, water-blocking ability, fluid diversion and sweep improvement, and matrix damage effect of micrometer-sized preformed particle gels (microgels) in reservoirs containing superpermeable (super-K) channels. The impact of the channel/matrix permeability contrast and the particle/pore size ratio in the channels …

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Investigating Game-Based Instruction As A Tool For Engineering Ethics Education In A First-Year Engineering Program, Joshua B. Reed Feb 2022

Investigating Game-Based Instruction As A Tool For Engineering Ethics Education In A First-Year Engineering Program, Joshua B. Reed

Theses and Dissertations

Behaving ethically is a core foundation within engineering and is a necessity according to the National Society of Professional Engineers. Therefore, engineering ethics education has been increasingly encouraged within engineering curriculums in higher education. Many instructors have found it difficult to teach engineering ethics effectively using traditional strategies such as lectures. This has caused a trend toward more active learning strategies being researched and utilized within the engineering ethics space. One strategy that has been growing in popularity in instruction both inside and outside of engineering is game-based learning or using educational games with instruction to accomplish learning goals. To …

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Concurrent Identification And Characterization Of Protein Structure And Continuous Internal Dynamics With Redcraft, Hanin Omar, Aaron Hein, Casey A. Cole, Homayoun Valafar Feb 2022

Concurrent Identification And Characterization Of Protein Structure And Continuous Internal Dynamics With Redcraft, Hanin Omar, Aaron Hein, Casey A. Cole, Homayoun Valafar

Faculty Publications

Internal dynamics of proteins can play a critical role in the biological function of some proteins. Several well documented instances have been reported such as MBP, DHFR, hTS, DGCR8, and NSP1 of the SARS-CoV family of viruses. Despite the importance of internal dynamics of proteins, there currently are very few approaches that allow for meaningful separation of internal dynamics from structural aspects using experimental data. Here we present a computational approach named REDCRAFT that allows for concurrent characterization of protein structure and dynamics. Here, we have subjected DHFR (PDB-ID 1RX2), a 159-residue protein, to a fictitious, mixed mode model of …

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Computational Investigation Of The Post-Yielding Behavior Of 3d-Printed Polymer Lattice Structures, Abdalsalam Fadeel, Hasanain Abdulhadi, Golam Newaz, Raghavan Srinivasan, Ahsan Mian Feb 2022

Computational Investigation Of The Post-Yielding Behavior Of 3d-Printed Polymer Lattice Structures, Abdalsalam Fadeel, Hasanain Abdulhadi, Golam Newaz, Raghavan Srinivasan, Ahsan Mian

Mechanical and Materials Engineering Faculty Publications

Sandwich structures are widely used due to their light weight, high specific strength, and high specific energy absorption. Three-dimensional (3D) printing has recently been explored for creating the lattice cores of these sandwich structures. Experimental evaluation of the mechanical response of lattice cell structures (LCSs) is expensive in time and materials. As such, the finite element analysis (FEA) can be used to predict the mechanical behavior of LCSs with many different design variations more economically. Though there have been several reports on the use of FEA to develop models for predicting the post-yielding stages of 3D-printed LCSs, they are still …

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Synergistic Enhancement Of Formic Acid Electro-Oxidation On Ptxcuy Co-Electrodeposited Binary Catalysts, Yaser M. Asal, Ahmad M. Mohammad, Sayed S. Abd El Rehim, Islam M. Al-Akraa Feb 2022

Synergistic Enhancement Of Formic Acid Electro-Oxidation On Ptxcuy Co-Electrodeposited Binary Catalysts, Yaser M. Asal, Ahmad M. Mohammad, Sayed S. Abd El Rehim, Islam M. Al-Akraa

Chemical Engineering

A propitious binary catalyst composed of Pt and Cu which were electrodeposited simultaneously onto a glassy carbon (GC) substrate was recommended for the formic acid (FA) electro-oxidation reaction (FAOR); the principal anodic reaction in the direct FA fuel cells (DFAFCs). The simultaneous co-electrodeposition of Pt and Cu in the catalyst provided an opportunity to tune the geometric functionality of the catalyst to resist the adsorption of poisoning CO at the Pt surface that represented the major impediment for DFAFCs marketing. The catalytic activity of the catalyst toward FAOR was significantly influenced by the (Pt4+/Cu2+) molar ratio of the electrolyte during …

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A Precise Dispenser Design For Canine Cognition Research, Walker Arce, Jeffrey R. Stevens Feb 2022

A Precise Dispenser Design For Canine Cognition Research, Walker Arce, Jeffrey R. Stevens

Department of Electrical and Computer Engineering: Faculty Publications

Some forms of canine cognition research require a dispenser that can accurately dispense precise quantities of treats. When using off-the-shelf or retrofitted dispensers, there is no guarantee that a precise number of treats will be dispensed. Often, they will over-dispense treats, which may not be acceptable for some tasks. Here we describe a 3D-printed precise treat dispenser with a 59-treat capacity driven by a stepper motor drive and controlled by an integrated Raspberry Pi. The dispenser can be built for less than 200 USD and is fully 3D printable. While off-the-shelf dispensers can result in an error rate of 20–30%, …

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A Note On Gradient/Fractional One-Dimensional Elasticity And Viscoelasticity, Kostas Parisis, Vlasis Dimosthenis, Leonidas Kouris, Avraam Konstantinidis, Elias C. Aifantis Feb 2022

A Note On Gradient/Fractional One-Dimensional Elasticity And Viscoelasticity, Kostas Parisis, Vlasis Dimosthenis, Leonidas Kouris, Avraam Konstantinidis, Elias C. Aifantis

Michigan Tech Publications, Part 1

An introductory discussion on a (weakly non-local) gradient generalization of some one-dimensional elastic and viscoelastic models, and their fractional extension is provided. Emphasis is placed on the possible implications of micro-and nano-engineering problems, including small-scale structural mechanics and composite materials, as well as collagen biomechanics and nanomaterials.

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Asphalt Mixture With Scrap Tire Rubber And Nylon Fiber From Waste Tires: Laboratory Performance And Preliminary M‐E Design Analysis, Dongzhao Jin, Dongdong Ge, Xiaodong Zhou, Zhanping You Feb 2022

Asphalt Mixture With Scrap Tire Rubber And Nylon Fiber From Waste Tires: Laboratory Performance And Preliminary M‐E Design Analysis, Dongzhao Jin, Dongdong Ge, Xiaodong Zhou, Zhanping You

Michigan Tech Publications, Part 1

Scrap tire rubber and nylon fiber are waste materials that could potentially be recycled and used to improve the mechanical properties of asphalt pavement. The objective of this research was to investigate the properties of scrap tire rubber and nylon fiber (R‐F) modified warm mix asphalt mixture (WMA). The high‐temperature performance was estimated by the Hamburg wheel-tracking testing (HWTT) device. The low‐temperature cracking performance was evaluated by the disk‐shaped compact tension (DCT) test and the indirect tensile strength (IDT) test. The stress and strain relationship was assessed by the dynamic modulus test at various temperatures and frequencies. The extracted asphalt …

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Color Tunable Aerogels/Sponge-Like Structures Developed From Fine Fiber Membranes, Alexa Villarreal, Raul Barbosa, Saptasree Bose, Bhupendra B. Srivastava, Victoria Padilla-Gainza, Karen Lozano Feb 2022

Color Tunable Aerogels/Sponge-Like Structures Developed From Fine Fiber Membranes, Alexa Villarreal, Raul Barbosa, Saptasree Bose, Bhupendra B. Srivastava, Victoria Padilla-Gainza, Karen Lozano

Mechanical Engineering Faculty Publications

The development of macroscopic aerogels from 1D systems, such as nanofibers, has resulted in a novel pathway to obtain porous and lightweight architectures. In this work, bright green, red, and tunable color emitting aerogels were obtained with luminescent nanofibers as the precursor system. A simple, low cost, and environmentally friendly process is followed where luminescent fillers are encapsulated within fibers which were subsequently freeze-dried to form 3D aerogels and sponge-like structures. Moreover, the aerogels/sponge-like structures show higher photoluminescence intensity than the fiber mats due to an increase of porosity which provides higher and direct interaction with the fillers and therefore …

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Implementation Of Multiscale Mechanisms In Finite Element Analysis Of Active Composite Structures, Amany G. Micheal Prof., Yehia Bahei El Din Prof. Feb 2022

Implementation Of Multiscale Mechanisms In Finite Element Analysis Of Active Composite Structures, Amany G. Micheal Prof., Yehia Bahei El Din Prof.

Centre for Advanced Materials

Composite structures reinforced with electrically active filaments are modeled with the finite element method while the underlying thermo-electromechanical coupling phenomena and damage are taken into consideration. At the outset, structural analysis is performed with a general-purpose finite element code and a special material routine, which propagates local phenomena to the overall scale is utilized. The material routine implements an interactive, multiscale analysis, which provides seamless integration of the mechanics at the composite’s micro, macro, and structural length scales. The interface between the multiscale material routine and the finite element code is made through nonmechanical strains caused by damage, and piezo/pyro-electric …

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Weak Shock Wave Reflections And Transitions, Thara Reshma I V Dr Feb 2022

Weak Shock Wave Reflections And Transitions, Thara Reshma I V Dr

Faculty work

Shock waves, their reflections, and transitions are an essential part of compressible high-speed flows. The nature of shock wave reflections entirely differs as the flow regime changes from steady to pseudo-steady and unsteady flow. So are the criteria governing the shock wave transition. One major classification in shock wave reflections is the strong and weak shock reflection domains, based on the flow being supersonic or subsonic, respectively, behind the reflected shock wave. The weak shock reflections are characterized by the curved nature of the reflected shock wave and the subsonic non-uniform flow downstream of it, which makes the flow analysis …

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Optimal Power And Frequency Control Of Microgrid Cluster With Mixed Loads, Saleh Dinkhah, Johana Salazar Cuellar, Maryam Khanbaghi Feb 2022

Optimal Power And Frequency Control Of Microgrid Cluster With Mixed Loads, Saleh Dinkhah, Johana Salazar Cuellar, Maryam Khanbaghi

Electrical and Computer Engineering

In recent years, voltage and frequency regulation issues have been extensively discussed for the microgrid clusters (MGCs), as the high penetration of renewable energy resources (RES) might affect the continuous operation of the microgrid (MG). Furthermore, to enhance the MGC’s operation reliability, stability concerns need to be addressed. In this study, a residential MGC connected to a commercial MGC has been considered. A novel control scheme that combines both droop control and virtual inertia control is proposed. This control strategy relies on online measurements, and it can be adapted to different situations. At each iteration, the damping coefficient and droop …

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