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Articles 42721 - 42750 of 196433

Full-Text Articles in Engineering

Study On Adsorption Characteristics Of Sulfonate Gemini Surfactant On Lignite Surface, Xuanlai Chen, Guochao Yan, Xianglin Yang, Guang Xu Dec 2021

Study On Adsorption Characteristics Of Sulfonate Gemini Surfactant On Lignite Surface, Xuanlai Chen, Guochao Yan, Xianglin Yang, Guang Xu

Mining Engineering Faculty Research & Creative Works

In order to explore the adsorption characteristics of sulfonate gemini surfactants on the surface of lignite, the molecular dynamics simulation method was used, and A kind of sulfonic acid bis sodium salt (S2) and the sodium dodecyl sulfate (SDS) were selected. A binary model of surfactant/lignite adsorption system and a ternary model of water/surfactant/lignite system were constructed, and a series of properties such as adsorption configuration, interaction energy, order parameters, relative concentration distribution, number of hydrogen bonds, etc., were analyzed. The results showed that the adsorption strength of S2 on the surface of lignite was higher than that of SDS. …

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The Route To Digital Transformation And Impact Of Industrial Internet Of Things (Iiot), Anna Merine George Dec 2021

The Route To Digital Transformation And Impact Of Industrial Internet Of Things (Iiot), Anna Merine George

Manipal Journal of Science and Technology

The adoption of digital technology into business has transformed the way manufacturers operate and deliver value to their customers. The ultimate aim of digital transformation begins with digital resources that can redevelop strategies for improving products or processes. Product Lifecycle Management (PLM) is a concept that tailors an enterprise to achieve specific outcomes. To be able to sustain in a world where digitalization is a buzzword, it would be imperative for organizations to be early adopters of technological advancements. Identifying the process wastes and eliminating them to improve the time-to-market would be a crucial deciding factor for any organization for …

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Feasibility Analysis Of Smart Home Devices - A Domestic Consumer Perspective, A Vittaleswar Dec 2021

Feasibility Analysis Of Smart Home Devices - A Domestic Consumer Perspective, A Vittaleswar

Manipal Journal of Science and Technology

The internet of things (IoT) is a relatively new technology that establishes a global network of machines and devices capable of communicating and exchanging data over the internet. However, IoT and the internet are not the same things. IoT generates, analyzes, and makes decisions about connected objects; in other words, the IoT is smarter than the internet. One of the most common applications that make use of the IoT infrastructure to connect multiple sensors is the smart home. The sensors can detect and collect information from the environment, which is then used to control various home systems such as lighting …

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Effectiveness Of Rubrics In Assessing Student Learning, Nakul Shetty K, Priyanka Desai Kakade, Anu Shaju Areeckal Dec 2021

Effectiveness Of Rubrics In Assessing Student Learning, Nakul Shetty K, Priyanka Desai Kakade, Anu Shaju Areeckal

Manipal Journal of Science and Technology

COVID-19 has forced educators across the world to switch to e-learning. However, online assessment platforms are not widely employed, and traditional assessment methods persist. There is a lack of appropriate feedback provided to students and negligible scope for students’ self-assessment of their learning. This can be rectified by employing e-rubrics for assessment by examiners as well as by students for self-assessment of their performance. We propose a case study investigating the effectiveness of a well-structured analytical rubric for assessment by examiners, as well as by students for self-assessment.

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Design And Simulation Of A Shunt Active Power Filter For Harmonic Mitigation, D G Wehby, R. C. Mala Dr Dec 2021

Design And Simulation Of A Shunt Active Power Filter For Harmonic Mitigation, D G Wehby, R. C. Mala Dr

Manipal Journal of Science and Technology

The aim of this paper is to present the design process of a shunt active filter (SAF) in power systems and to highlight its importance in mitigating harmonics. The huge widespread of non-linear loads is rendering the source currents non-sinusoidal and thus producing harmful harmonics. In order to appreciate the effect of SAFs in power systems, a problem is adopted in which a non-linear load is present. The system is then modelled, and MATLAB Simulink simulations are carried on to highlight the undesirable presence of harmonics without the filter being installed and to showcase the power of the SAF in …

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Reconfigurable Antennas & Matching Networks For Cubesats, Marios Patriotis Dec 2021

Reconfigurable Antennas & Matching Networks For Cubesats, Marios Patriotis

Electrical and Computer Engineering ETDs

Telecommunication has rapidly evolved in the past decades, quickly becoming one of the most expansive industries, especially with the presence of new attractive eras like 5Gnetworks, automotive radars, and CubeSats. The use of miniaturized satellites such as CubeSats for cheaper and wider communication coverage has opened the possibilities for cluster satellite communication. These units exist in a continuously varying environment as much physical as electromagnetic. Hence, the establishment of a successful communication link among the space units but also ground stations becomes challenging. This new situation can be confronted with the installation of new reconfigurable antennas. These are emitting units …

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A Comparative Study Of Machine Learning Methods For Automated Identification Of Radioisotopes Using Nai Gamma-Ray Spectra, S. M. Galib, P. K. Bhowmik, A. V. Avachat, H. K. Lee Dec 2021

A Comparative Study Of Machine Learning Methods For Automated Identification Of Radioisotopes Using Nai Gamma-Ray Spectra, S. M. Galib, P. K. Bhowmik, A. V. Avachat, H. K. Lee

Nuclear Engineering and Radiation Science Faculty Research & Creative Works

This article presents a study on the state-of-the-art methods for automated radioactive material detection and identification, using gamma-ray spectra and modern machine learning methods. The recent developments inspired this in deep learning algorithms, and the proposed method provided better performance than the current state-of-the-art models. Machine learning models such as: fully connected, recurrent, convolutional, and gradient boosted decision trees, are applied under a wide variety of testing conditions, and their advantage and disadvantage are discussed. Furthermore, a hybrid model is developed by combining the fully connected and convolutional neural network, which shows the best performance among the different machine learning …

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Theoretical Prediction Of Mechanical Behavior Of Regular And Chiral Honeycombs Based On Loading Of Single Cell., Sai Krishna K. Pinnamaneni Dec 2021

Theoretical Prediction Of Mechanical Behavior Of Regular And Chiral Honeycombs Based On Loading Of Single Cell., Sai Krishna K. Pinnamaneni

Mechanical and Aerospace Engineering Dissertations - Archive

Cellular solids are both naturally occurring and man-made materials depending on the characteristic length or Stochastic manner, these materials exhibit a low-relative density usually 30% than the constituent solid material. Low-density cellular solids have been demonstrating superior mechanical properties in various applications from marine to aerospace and lightweight sandwich structures, which has intrigued in development of novel structured materials. Cellular solids offer great design flexibility ashowows how for the targeted geometric for the application-based industry. These materials are used in sandwich structures and come in the shape of hexagonal. An additional aspect of determining the properties and behavior is by …

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Evaluation Of Geotechnical Parameters Of Soil Using Electrical Resistivity Imaging, Md Asif Akhtar Dec 2021

Evaluation Of Geotechnical Parameters Of Soil Using Electrical Resistivity Imaging, Md Asif Akhtar

Civil Engineering Dissertations - Archive

Electric resistivity imaging (ERI) is an effective non-destructive and rapid measuring way of obtaining continuous soil subsurface resistivity profiles. An ERI technique can be used to identify moisture variations and soil heterogeneities in an area. Thus, ERI is becoming a popular tool in geotechnical (FHWA, 2015)engineering; however, it only provides qualitative information at the current time. Using qualitative images, it is challenging to extract quantitative geotechnical information, such as the type of soil, moisture content, degree of saturation, and atterberg limit, of the subsurface. Several studies have described the electrical resistance of soil as a function of pore fluid conductivity …

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Design For Older Adults – Functional Limitations And Human Factors Engineering, Megumi Sato Hice Dec 2021

Design For Older Adults – Functional Limitations And Human Factors Engineering, Megumi Sato Hice

Industrial, Manufacturing, and Systems Engineering Dissertations - Archive

Background: Throughout the aging process, people experience changes in functional ability and such changes can happen in physical and mental functions. As a result, older adults develop limitations in their capabilities to perform daily activities. Although many studies have done to identify functional limitations for elderly, many older adults still face negative consequences in daily living conditions due to their functional declines. One of the possible causes may be a lack of feedback or participations of elderly users in the design process. Other reason could be a lack of consideration to identify the needs for a specific task associated with …

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Multi-Parametric And Multi-Objective Optimization Of Heatsinks For Forced And Natural Convection Based Single-Phase Immersion Cooling Of Server, Tushar Rohidas Wagh Dec 2021

Multi-Parametric And Multi-Objective Optimization Of Heatsinks For Forced And Natural Convection Based Single-Phase Immersion Cooling Of Server, Tushar Rohidas Wagh

Mechanical and Aerospace Engineering Theses - Archive

An increase in utility of internet-based services, cloud computing and greater performance demands due to rising AI and ML applications have led to a steep growth in GPU and CPU thermal design power. Efficient thermal management of these processors has become a bottleneck in performance enhancement and corresponding power densification of these components. Furthermore, increased pressure on data center owners to reduce power demands and move towards green computing has exacerbated the data center cooling challenges. Single-phase immersion cooling allows data center owners to not only dissipate the increasing heat fluxes efficiently but can also potentially improve equipment reliability as …

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Study Of Sac Solder Interconnect Parameters In Microelectronic Semiconductor Packaging And Their Effects On Electromigration Failure Mechanisms, Allison Theresa Osmanson Dec 2021

Study Of Sac Solder Interconnect Parameters In Microelectronic Semiconductor Packaging And Their Effects On Electromigration Failure Mechanisms, Allison Theresa Osmanson

Material Science and Engineering Dissertations - Archive

As the shrinkage of electronic devices becomes more appealing, so do their high capacity and efficiency. This demand for ever-shrinking sizes of electronic devices follows the trend predicted by Moore’s Law. To achieve smaller devices, reduced sizes of solder joints, Cu traces, Cu pads, and other components in packages are implemented with tighter tolerances for geometries and layouts. With each incremental change in dimension or material, new reliability challenges emerge. Electromigration (EM), the directional diffusion of atoms with the flow of electrons, has been an inevitable reliability concern for microelectronic device packaging. It is one common failure mechanism in wafer-level …

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Study On Forming Dna-Mediated Nanoparticle Conjugates: Toward Detection Of Covid-19, Chinmay Nitin Afzulpurkar Dec 2021

Study On Forming Dna-Mediated Nanoparticle Conjugates: Toward Detection Of Covid-19, Chinmay Nitin Afzulpurkar

Material Science and Engineering Theses - Archive

The objective of this thesis is to establish a rapid, robust, and reproducible procedure to controllably assemble DNA-functionalized Au nanoparticles (AuNPs) into satellite-shaped nanostructures using sequence-specific DNA hybridization. A target DNA strand with COVID-19 sequence (t-DNA) is used as a bridge to connect a capture DNA functionalized on a 50nm gold nanoparticle (C-AuNP) and a probe DNA functionalized on a 30nm nanoparticle (P-AuNP), creating C-AuNP/t-DNA/P-AuNP conjugates. The C-DNA is complementary to a portion of t-DNA, and P-DNA is complementary to the other portion of t-DNA. The parameters that affect the conjugate formation, including hybridization buffer strength, hybridization temperature, and DNA …

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Change In Sedimentation Regime Due To Bridge Construction Activities: A Field Study At Fm 2478 Bridge Over Wilson Creek, Mckinney, Texas, Subhas Kandel Dec 2021

Change In Sedimentation Regime Due To Bridge Construction Activities: A Field Study At Fm 2478 Bridge Over Wilson Creek, Mckinney, Texas, Subhas Kandel

Civil Engineering Theses - Archive

Bridge construction activities can cause soil disturbances that introduce sediments into a receiving stream and potentially impact its quality and the ecosystem. The impacts of bridge construction activities are studied in two ways: overland erosion and in-stream sediment concentration. For this research, the overland erosion of Wilson Creek in McKinney, Texas was monitored from four erosion plots constructed on its banks, near the bridge construction activities zone. The instream water quality was examined during the construction period by measuring the Total Suspended Solids (TSS) and the turbidity of water samples, and the sediment and water samples were collected and analyzed …

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Carbon Footprint Assessment And Emissions Reduction Strategies For The University Of Texas At Arlington, Dravid Sabarish Villavan Kothai Dec 2021

Carbon Footprint Assessment And Emissions Reduction Strategies For The University Of Texas At Arlington, Dravid Sabarish Villavan Kothai

Civil Engineering Theses - Archive

In the past decade, many universities have started to ascertain their emissions and benchmark their progress towards sustainability and climate control. The University of Texas at Arlington (UTA) is no exception in working toward the goal of carbon neutrality. While UTA continues to grow and transform, its goal is to simultaneously reduce energy intensity and greenhouse gas (GHG) emissions. To this end, the Office of Sustainability is maintaining a carbon inventory for each year to track GHG emissions and provide information to guide reduction strategies. The primary objectives of this research were: 1. To update UTA’s greenhouse gas emissions inventory …

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One Step At A Time: Improving The Fidelity Of Geospatial Agent-Based Models Using Empirical Data, Amy A. Marusak Dec 2021

One Step At A Time: Improving The Fidelity Of Geospatial Agent-Based Models Using Empirical Data, Amy A. Marusak

Industrial, Manufacturing, and Systems Theses - Archive

Agent-based modeling is frequently used to produce geospatial models of transportation systems. However, reducing the computational requirements of these models can require a degree of abstraction that can compromise the fidelity of the modeled environment. The purpose of the agent-based model presented in this thesis is to explore the potential of a volunteer-based crowd-shipping system for rescuing surplus meals from restaurants and delivering them to homeless shelters in Arlington, Texas. Each iteration of the model’s development has sought to improve model realism by incorporating empirical data to strengthen underlying assumptions. This thesis describes the most recent iteration, in which a …

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Design Of Miniaturized Antipodal Vivaldi Antennas And A Microwave Head Imaging System For The Detection Of Blood Clots In The Brain, Farhana Parveen Dec 2021

Design Of Miniaturized Antipodal Vivaldi Antennas And A Microwave Head Imaging System For The Detection Of Blood Clots In The Brain, Farhana Parveen

Electronic Theses and Dissertations, 2020-2023

Traditional brain imaging modalities, for example, MRI, CT scan, X-ray, etc. can provide precise and high-resolution images of the brain for diagnosing lesions, tumors or clots inside the brain. However, these modalities require bulky and expensive test setups accessible only at specialized diagnostic centers, and hence may not be suitable or affordable to many patients. Furthermore, the inherent health risks limit the usability of these modalities for frequent monitoring. Microwave imaging is deemed a promising alternative due to its being cost-effective, portable, non-ionizing, non-intrusive. Therefore, this work aims to design an effective microwave head imaging system for the detection of …

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Framework Of Big Data Analytics In Real Time For Healthcare Enterprise Performance Measurements, Ahmed Mohamed Dec 2021

Framework Of Big Data Analytics In Real Time For Healthcare Enterprise Performance Measurements, Ahmed Mohamed

Electronic Theses and Dissertations, 2020-2023

Healthcare organizations (HCOs) currently have many information records about their patients. Yet, they cannot make proper, faster, and more thoughtful conclusions in many cases with their information. Much of the information is structured data such as medical records, historical data, and non-clinical information. This data is stored in a central repository called the Data Warehouse (DW). DW provides querying and reporting to different groups within the healthcare organization to support their future strategic initiatives. The generated reports create metrics to measure the organization's performance for post-action plans, not for real-time decisions. Additionally, healthcare organizations seek to benefit from the semi-structured …

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Using Peptide Design To Engineer Polyelectrolyte Complex Biomaterials, Sara Tabandeh Dec 2021

Using Peptide Design To Engineer Polyelectrolyte Complex Biomaterials, Sara Tabandeh

Electronic Theses and Dissertations, 2020-2023

The self-assembly of oppositely charged polymers provides a versatile platform to design materials for diverse applications in biology and medicine. Electrostatically-driven phase separation of oppositely charged polymers in aqueous solution gives rise to the formation of a polymer-rich phase called a polyelectrolyte complex (PEC). PECs can be in the form of liquid droplets (complex coacervates) or amorphous solid precipitates. Unlike synthetic polymers, peptides are good candidates for developing tailor-made formulations and structure-property relationships due to their biocompatibility, precise control over sequences, and ability to program hydrogen bonding interactions. However, little is known about the effect of combining additional molecular interactions …

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Nevr: Learning Continuous Neural Video Representation With Local Feature Codes For Video Interpolation, Wentao Shangguan Dec 2021

Nevr: Learning Continuous Neural Video Representation With Local Feature Codes For Video Interpolation, Wentao Shangguan

McKelvey School of Engineering Graduate Student Theses & Dissertations

Video frame interpolation aims to synthesis a non-exists intermediate frame guided by two successive frames. Recently, some work shows excellent results in learning continuous representation of temporally-varying 3D objects with neural field (NF), which could be used for interpolating the original video. However, these methods require several videos from different viewing angles, the information of camera poses, learning for each specific scene, and achieving sub-optimal results for video frame interpolation. To this end, we propose a new learning neural field representation-based model, Neural Video Representation (NeVR) to learn a continuous representation of videos for high-quality video interpolation. Unlike the traditional …

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Understanding The Behavior Of The Covid-19 Pandemic Using Data Analytics, Mohammad Reza Davahli Dec 2021

Understanding The Behavior Of The Covid-19 Pandemic Using Data Analytics, Mohammad Reza Davahli

Electronic Theses and Dissertations, 2020-2023

In December 2019, China announced the breakout of a new virus identified as coronavirus SARS-CoV-2 (COVID-19), which soon grew exponentially and became a global pandemic. Despite strict actions to mitigate the spread of the virus in various countries, the COVID-19 pandemic resulted in a significant loss of human life in 2020 and 2021. To better understand the pandemic, this doctoral research incorporated data analytics to evaluate the behavior and impacts of the virus. The doctoral research contributed to the scientific body of the knowledge in different ways including (1) presenting a systematic literature review of current research and topics about …

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Structural Dynamics And Encapsulation Properties Of Polyelectrolyte Complex Micelles, Sachit Shah Dec 2021

Structural Dynamics And Encapsulation Properties Of Polyelectrolyte Complex Micelles, Sachit Shah

Electronic Theses and Dissertations, 2020-2023

Charged therapeutics such as nucleic acids and proteins can treat a vast range of human diseases that are traditionally undruggable. Their broadness in treating disease is due to their ability to influence cellular function. However, their high charge density and physiological barriers such as enzymatic degradation, hinder the deliverability of these molecules to the sites of disease. Polyelectrolyte complex (PEC) micelles are core-corona nanostructures that can encapsulate charged molecules and offer a platform for delivery. PECs form the core, when two oppositely charged polyelectrolytes are mixed in an aqueous solution, and the micelle corona is a neutral hydrophilic polymer that …

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A Framework For The Design And Characterization Of Advanced Gaskets, Sannmit Shinde Dec 2021

A Framework For The Design And Characterization Of Advanced Gaskets, Sannmit Shinde

Electronic Theses and Dissertations, 2020-2023

Most industrial manufacturing or processing plants use bolted connections between pipes that transfer media from one location to another. Gaskets are often used to seal these systems as they offer elevated levels of leak mitigation; however, despite their nearly universal usage, the current understanding of gasket mechanics at the meso-scale is still limited. Contemporary gaskets feature viscoelastic materials, fillers, textures, and are fabricated at various thicknesses. They are used in a wide range of thermal, mechanical, chemical, and temporal conditions. The current work characterizes polytetrafluoroethylene (PTFE) gaskets made with several different filler materials and having vastly different geometries. The chemically …

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On Mode Transition Phenomenon And Operating Conditions In Rotating Detonation Rocket Engines, Taha Rezzag-Lebza Dec 2021

On Mode Transition Phenomenon And Operating Conditions In Rotating Detonation Rocket Engines, Taha Rezzag-Lebza

Electronic Theses and Dissertations, 2020-2023

The work presented herein consist of first studying the instantaneous properties of the detonation waves in a rotating detonation rocket engine by tracking each individual wave and recording its position, velocity, and peak intensity as it travels around the annulus. Results for a steady portion of a test performed on a rotating detonation rocket engine show that the wave properties exhibit oscillatory behavior. Results obtained from the rotating detonation rocket engine show that the properties are highly dependent on the azimuthal position. In an attempt to understanding the cause of such a behavior, similar investigations were performed on an air-breathing …

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Understanding Students’ Global Interdependence In Science Instruction, Walter S. Smith Dec 2021

Understanding Students’ Global Interdependence In Science Instruction, Walter S. Smith

Journal of Global Education and Research

Multiple American educational organizations such as the National Education Association, Association for Supervision and Curriculum Development, and the Council of Chief State School Officers have advocated for globalizing the K-12 curriculum. The National Science Teaching Association (NSTA) in a position statement on international education and the Next Generation Science Standards have produced goals and standards for internationalizing the science curriculum by addressing topics such as climate change, environment, and disease that cross borders. In contrast to those pronouncements on the curriculum, this article views global science education through an instructional lens that focuses on a students’ global interdependence in science …

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Constraint Optimal Selection Techniques (Costs) For A Class Of Linear Programming Problems, Tai-Kuan Sung Dec 2021

Constraint Optimal Selection Techniques (Costs) For A Class Of Linear Programming Problems, Tai-Kuan Sung

Industrial, Manufacturing, and Systems Engineering Dissertations - Archive

This dissertation describes two classes of Constraint Optimal Selection Techniques (COSTs). An algorithm of each type is developed for solving nonnegative linear programming problems. In addition, geometric interpretations of these new algorithms are given, computational results for some large-scale problems are provided, and directions for future research are discussed.

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Distributed Estimation And Inverse Reinforcement Learning For Multi-Agent Systems, Bosen Lian Dec 2021

Distributed Estimation And Inverse Reinforcement Learning For Multi-Agent Systems, Bosen Lian

Electrical Engineering Dissertations - Archive

Consensus-based distributed Kalman filters for estimation with multiple targets have attracted considerable attention. Most of the existing Kalman filters use the average consensus approach, which tends to have a low convergence speed. They also rarely consider the impacts of limited sensing range and target mobility on the information flow topology. The robustness properties, i.e., gain margins and phase margins of distributed Kalman filtering algorithms are still open problems. In the interactions of controlled dynamical agents, it is often assumed that the agents are "rational" in the sense of attempting to act in such a way as to optimize some prescribed …

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Fast And Parallelizable Numerical Algorithms For Large Scale Conic Optimization Problems, Muhammad Adil Dec 2021

Fast And Parallelizable Numerical Algorithms For Large Scale Conic Optimization Problems, Muhammad Adil

Electrical Engineering Dissertations - Archive

Many real world problems from various application areas such as engineering, finance and operation research can be cast as optimization problems. Generally, the goal is to optimize an objective function under a set of constraints. Traditionally, convex optimization problems are solved by an interior point method (IPM). Interior point methods proved to achieve high accuracy for moderate size problems. However, the computation cost of iterations of these iterative algorithms grows non-linearly with the dimension of the problem. Although interior-point methods are robust and theoretically sound, they do not scale well for very large conic optimization programs. Computational cost, memory issues, …

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Gaylord Produce Removal Machine, Marcus Takashi Hirose Lee, Jacob Michael Perlman, Carissa Abigail Kamm, Mark Misao Loera Dec 2021

Gaylord Produce Removal Machine, Marcus Takashi Hirose Lee, Jacob Michael Perlman, Carissa Abigail Kamm, Mark Misao Loera

Mechanical Engineering

This Final Design Review Report outlines the senior design project that began Winter Quarter of 2021 at California Polytechnic State University. Our team consists of three mechanical engineers and a general engineer, working together to design, build, and test a product for Alameda County Food Bank. The goal of the final product is to relieve volunteers and employees of tedious manual labor and increase efficiency during the removal of produce from large Gaylord containers. This document describes background research, the objectives of the project, chosen concept design, analysis and initial prototyping of said concept, the final design, and verification prototype …

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3-In-1 Medical Lancet, Jonathan J. Panella, Gage Vogtlin, Marissa Koski, Benjamin Neyland Dec 2021

3-In-1 Medical Lancet, Jonathan J. Panella, Gage Vogtlin, Marissa Koski, Benjamin Neyland

Mechanical Engineering

First responders need a quick, sterile, and convenient way to sample blood for glucose testing because glucose levels are a vital metric in assessing time-critical emergency situations. The blood sampling process consists of pre-sterilizing the sample site on the skin with an alcohol pad, pricking the skin with a lancet, and lastly, after sampling, putting a bandage over the prick site. The scope of this project is to design a device which integrates and streamlines the use of the three sub-processes (sterilization, lancing, and bandaging) while upholding the necessary requirements of a single-use medical device and considering other factors which …

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