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Articles 68371 - 68400 of 196904

Full-Text Articles in Engineering

Stabilizing Action Of Sodium Citrate When Receiving Silver Nanoparticles By The Method Of Chemical Restoration, Komil M. Mukimov, Shamil M. Sharipov, Tal’At S. Asilov, Asliddin Kh. Bakhriddinov Apr 2019

Stabilizing Action Of Sodium Citrate When Receiving Silver Nanoparticles By The Method Of Chemical Restoration, Komil M. Mukimov, Shamil M. Sharipov, Tal’At S. Asilov, Asliddin Kh. Bakhriddinov

Euroasian Journal of Semiconductors Science and Engineering

The results of the synthesis of colloidal silver nanoparticles by the method of chemical reduction by ascorbic acid in the presence of sodium citrate are presented. The use of ascorbic acid as a reducing agent allows the synthesis of nanoparticles at room temperature. This makes it possible to study the mechanisms of the stabilizing effect of sodium citrate in the process of obtaining nanoparticles.

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Influence Of Ultrasonic Waves On The Photoelectric And Spectral Characteristics Of Si-Photodetectors, Abdumalik G. Gaibov, Kutbiddin I. Vakhobov Apr 2019

Influence Of Ultrasonic Waves On The Photoelectric And Spectral Characteristics Of Si-Photodetectors, Abdumalik G. Gaibov, Kutbiddin I. Vakhobov

Euroasian Journal of Semiconductors Science and Engineering

The paper considers the influence of ultrasonic fields on the photoelectric and spectral characteristics of diffusion Si-receivers of electromagnetic radiation. It was found that ultrasonic irradiation increases the lifetime, diffusion length of carriers and, as a consequence, increases the efficiency of collecting carriers on the electrical contacts of Si-receivers. As a result of these processes, an increase in the value of the short-circuit current is observed, which causes an increase in the open circuit voltage and the efficiency of such a diffusion Si-structure operating in the photo reformation mode.

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Cascode Injection-Voltaic Transistor Fiber/Polymer Composite, Ziyoda Kh. Aripova, Shunkorjon T. Toshmatov Apr 2019

Cascode Injection-Voltaic Transistor Fiber/Polymer Composite, Ziyoda Kh. Aripova, Shunkorjon T. Toshmatov

Euroasian Journal of Semiconductors Science and Engineering

This paper developed injection-voltaic transistor presents. The results research of the V-I characteristic of cascode injection-voltaic transistor. It is shown that the proposed transistor operates stably at values of the reverse voltage collector-base 2-3 times higher than single transistors.

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Features Of Diffusion In Epitaxial Cosi2 Films Grown On The Surface Of Fluorete Of Deep Levels In Silicon Doped By Tungsten, Bakhrom E. Egamberdiev, Shokhruh A. Sayfulloev Apr 2019

Features Of Diffusion In Epitaxial Cosi2 Films Grown On The Surface Of Fluorete Of Deep Levels In Silicon Doped By Tungsten, Bakhrom E. Egamberdiev, Shokhruh A. Sayfulloev

Euroasian Journal of Semiconductors Science and Engineering

The paper presents the results of the analysis of the epitaxial film CoSi2/Si/CaF2(100) grown by molecular beam epitaxy. It is proved that under certain conditions of heat treatment, so-called epitaxial silicides are formed on the crystal structure, which can play the role of conductive layers or metal coatings. The data obtained allow us to draw conclusions about the morphology of the film and the nature of diffusion in the CoSi2 layer.

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Upgrading Photo - Thermal Battery For Increasing Efficiency In Use Hot Climate, Ramizulla A. Muminov, Mukhammad N. Tursunov, Khabibullo X. Sabirov, Sanjar K. Shokuchkorov Apr 2019

Upgrading Photo - Thermal Battery For Increasing Efficiency In Use Hot Climate, Ramizulla A. Muminov, Mukhammad N. Tursunov, Khabibullo X. Sabirov, Sanjar K. Shokuchkorov

Euroasian Journal of Semiconductors Science and Engineering

The experimental results of the modernization of photo – thermal battery of the new design of increased efficiency with thermal contact of the collector with the back surface of the photovoltaic battery (PhB) are presented. It is shown that the use of materials with a large reflection coefficient in the lateral plane of reflection, increasing accuracy of the operational guidance node on the Sun reducing the capacity of the heat collector provides an increase in power and uniformity of the temperature of the real surface of the PhB, which allows to increase the efficiency of the device.

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The Method Of Sealing Of Temperature Sensors With Nickel Nanoclusters, Saifillo S. Nasriddinov, Shoira P. Usmanova, Shukhrat A. Ismoilov Apr 2019

The Method Of Sealing Of Temperature Sensors With Nickel Nanoclusters, Saifillo S. Nasriddinov, Shoira P. Usmanova, Shukhrat A. Ismoilov

Euroasian Journal of Semiconductors Science and Engineering

A method of sealing of temperature sensors to protect them from external factors is presented. The properties of the compound are also considered: high mechanical strength, water resistance, low moisture permeability, heat resistance, ozone resistance, high electrical strength.

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Program Progress Performance Report #4, Missouri University Of Science And Technology. Inspire - University Transportation Center Apr 2019

Program Progress Performance Report #4, Missouri University Of Science And Technology. Inspire - University Transportation Center

Semi-Annual Progress Reports

No abstract provided.

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Interrogation Of Spent Nuclear Fuel Casks Using Cosmic-Ray Muon Computed Tomography, Daniel C. Poulson Apr 2019

Interrogation Of Spent Nuclear Fuel Casks Using Cosmic-Ray Muon Computed Tomography, Daniel C. Poulson

Nuclear Engineering ETDs

Properly accounting and safeguarding spent nuclear fuel are key components in the International Atomic Energy Agency’s mission of non-proliferation. Currently, no instruments are deployed that are able to verify the spent nuclear fuel contents of dry storage casks. Cosmic-ray muons provide an ideal probe for the heavily shielded casks due to their ability to penetrate thick, dense materials. Coulombic scattering of the muons, to first order, is proportional to the Z2/A of the material; this makes it especially sensitive to actinides, such as uranium and plutonium. The combination of these traits allows muons to be used to image and verify …

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Benchmarking Image Processing Algorithms For Unmanned Aerial System-Assisted Crack Detection In Concrete Structures, Sattar Dorafshan, Robert J. Thomas, Marc Maguire Apr 2019

Benchmarking Image Processing Algorithms For Unmanned Aerial System-Assisted Crack Detection In Concrete Structures, Sattar Dorafshan, Robert J. Thomas, Marc Maguire

Civil Engineering Faculty Publications

This paper summarizes the results of traditional image processing algorithms for detection of defects in concrete using images taken by Unmanned Aerial Systems (UASs). Such algorithms are useful for improving the accuracy of crack detection during autonomous inspection of bridges and other structures, and they have yet to be compared and evaluated on a dataset of concrete images taken by UAS. The authors created a generic image processing algorithm for crack detection, which included the major steps of filter design, edge detection, image enhancement, and segmentation, designed to uniformly compare different edge detectors. Edge detection was carried out by six …

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Urban Underground Infrastructure Monitoring Iot: The Path Loss Analysis, Abdul Salam, Syed Shah Apr 2019

Urban Underground Infrastructure Monitoring Iot: The Path Loss Analysis, Abdul Salam, Syed Shah

Faculty Publications

The extra quantities of wastewater entering the pipes can cause backups that result in sanitary sewer overflows. Urban underground infrastructure monitoring is important for controlling the flow of extraneous water into the pipelines. By combining the wireless underground communications and sensor solutions, the urban underground IoT applications such as real time wastewater and storm water overflow monitoring can be developed. In this paper, the path loss analysis of wireless underground communications in urban underground IoT for wastewater monitoring has been presented. It has been shown that the communication range of up to 4 kilometers can be achieved from an underground …

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The Effect Of Mechanical Agitator Geometry On Catheter Directed Thrombectomy, Sanghun Alex Lee Apr 2019

The Effect Of Mechanical Agitator Geometry On Catheter Directed Thrombectomy, Sanghun Alex Lee

McKelvey School of Engineering Graduate Student Theses & Dissertations

Venous thromboembolism (VTE) is a vascular disease in which a blood clot forms inside of a vein, most often deep in the legs, groin, or arm. Two types of VTE exist, deep vein thrombosis (DVT) and pulmonary embolism (PE). DVT occurs when a clot in a deep vein forms, risking embolism and causing swelling as the clot obstructs blood flow. An embolism occurs when a part or all the thrombus breaks off and travels in the circulation, getting lodged in the lungs. A pulmonary embolism is a very serious medical condition and can be fatal if not treated immediately. Current …

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Capillary Penetration Method For Measuring Wetting Properties Of Carbon Ionomer Films For Proton Exchange Membrane Fuel Cell (Pemfc) Applications, Sofyane Abbou, Kazuya Tajiri, K. T. Alofari, Ezequiel F. Medici, A. T. Haug, Jeffrey S. Allen Apr 2019

Capillary Penetration Method For Measuring Wetting Properties Of Carbon Ionomer Films For Proton Exchange Membrane Fuel Cell (Pemfc) Applications, Sofyane Abbou, Kazuya Tajiri, K. T. Alofari, Ezequiel F. Medici, A. T. Haug, Jeffrey S. Allen

Michigan Tech Publications, Part 1

In this work, capillary rise experiments were performed to assess the wetting properties of carbon-ionomer (CI) films. The samples were attached to a micro-balance and then immersed into liquid water to (i) measure the mass gain from the liquid uptake and (ii) estimate the (external) contact angle to water (typical value around 140°). The results showed that drying the CI films under low vacuum significantly impacted the CI film wettability. The influence of the ionomer content on the CI films’ wettability was investigated with various ionomer to carbon (I/C) ratios: 0.8, 1.0, 1.2 and 1.4. No significant variation of the …

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Biomedical Engineering Or Biomedical Optics: Will The Real Discipline Please Stand Up?, Brian W. Pogue Apr 2019

Biomedical Engineering Or Biomedical Optics: Will The Real Discipline Please Stand Up?, Brian W. Pogue

Dartmouth Scholarship

This editorial reflects on the shape of biomedical engineering as a discipline, and its relation to biomedical optics.

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Automatic Look-Up Table Based Real-Time Phase Unwrapping For Phase Measuring Profilometry And Optimal Reference Frequency Selection, Jianwen Song, Daniel L. Lau, Yo-Sung Ho, Kai Liu Apr 2019

Automatic Look-Up Table Based Real-Time Phase Unwrapping For Phase Measuring Profilometry And Optimal Reference Frequency Selection, Jianwen Song, Daniel L. Lau, Yo-Sung Ho, Kai Liu

Electrical and Computer Engineering Faculty Publications

For temporal phase unwrapping in phase measuring profilometry, it has recently been reported that two phases with co-prime frequencies can be absolutely unwrapped using a look-up table; however, frequency selection and table construction has been performed manually without optimization. In this paper, a universal phase unwrapping method is proposed to unwrap phase flexibly and automatically by using geometric analysis, and thus we can programmatically build a one-dimensional or two-dimensional look-up table for arbitrary two co-prime frequencies to correctly unwrap phases in real time. Moreover, a phase error model related to the defocus effect is derived to figure out an optimal …

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Sliding-Mode-Observer-Based Position Estimation For Sensorless Control Of The Planar Switched Reluctance Motor, Jundi Sun, Guang-Zhong Cao, Su-Dan Huang, Yeping Peng, Jiangbiao He, Qing-Quan Qian Apr 2019

Sliding-Mode-Observer-Based Position Estimation For Sensorless Control Of The Planar Switched Reluctance Motor, Jundi Sun, Guang-Zhong Cao, Su-Dan Huang, Yeping Peng, Jiangbiao He, Qing-Quan Qian

Electrical and Computer Engineering Faculty Publications

This paper proposes a position estimation method for a planar switched reluctance motor (PSRM). In the method, a second-order sliding mode observer (SMO) is used to achieve sensorless control of a PSRM for the first time. A sensorless closed-loop control strategy based on the SMO without a position sensor for the PSRM is constructed. The SMO mainly consists of a flux linkage estimation, an adaptive current estimation, an observing error calculation, and a position estimation section. An adaptive current observer is applied in the current estimation section to minimize the error between the measured and estimated currents and to increase …

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College Of Engineering Welcomes New Development Director | College Of Engineering, Utah State University Apr 2019

College Of Engineering Welcomes New Development Director | College Of Engineering, Utah State University

College of Engineering News

The College of Engineering at Utah State University welcomes David A. Kunz as the new senior director of development. Kunz joined the college on April 24. He will oversee all fundraising efforts and in-kind donations from industry partners.

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Extreme Altitude Search And Rescue Helicopter, Matthew J. De Sieno, Anthony Chavarria, David Stuver, Zach Boss Apr 2019

Extreme Altitude Search And Rescue Helicopter, Matthew J. De Sieno, Anthony Chavarria, David Stuver, Zach Boss

Senior Design Project For Engineers

The goal of this design was to develop an extreme altitude rescue helicopter capable of retrieving hikers stranded on top of Mount Everest. Using the Eurocopter AS350 as a baseline, a conceptual model was produced that is fully capable of hovering and delivering forward flight at the desired altitude of 8,848 meters. Combined blade element momentum theory, proper airfoil selection, and forward flight calculations were utilized in order to optimize the rotor for the given flight conditions on top of Mount Everest. Conceptual fluid dynamics and CAD modeling aided in the process of visually designing the fuselage and rotor. Not …

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Optimization Of The Retention Rates Of Ready Mix Usa Drivers, Pruthvi Hira, Jaime Harmon, Kenneth Correa, Destiny Sessums Apr 2019

Optimization Of The Retention Rates Of Ready Mix Usa Drivers, Pruthvi Hira, Jaime Harmon, Kenneth Correa, Destiny Sessums

Senior Design Project For Engineers

Ready Mix USA, a CEMEX company, is a giant in the building materials industry, servicing the Southeastern region of the United States through various commercial and residential projects. The Atlanta Division of RMUSA currently consists of 15 operational plants in the state of Georgia with its headquarters located in Woodstock. From the years 2015 to 2018, managers at Ready Mix USA noticed a drastic increase in turnover rates of ready mix truck drivers and did not have an answer for the increasing percentages. The Continuous Improvement at RMUSA tasked the student project team from the Industrial and Systems Engineering department …

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Deployable Solar Array Structure: G1:3, Daniel Bain, Craig Patton, Andrew Tendean Apr 2019

Deployable Solar Array Structure: G1:3, Daniel Bain, Craig Patton, Andrew Tendean

Senior Design Project For Engineers

This design project is in response to an AIAA RFP (Request-For-Proposal) to build a compact, durable, non-hinged solar array to be deployed from a spacecraft on its way from the Earth to Mars. The solar array structures are used to provide the continual supply of power to operate onboard equipment. A large array will be required but must fit within the fairing of the launch vehicle. Origami principles will be utilized to fit the given constrained stored volume of 10 cm3 while satisfying the power requirements and avoiding structural complications due to tight folds.

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Unmanned Aerial Power Line Surveillance Drone, Brock Arp, Wade Vine, Cameron Whigham, Lorenzo Stewart Apr 2019

Unmanned Aerial Power Line Surveillance Drone, Brock Arp, Wade Vine, Cameron Whigham, Lorenzo Stewart

Senior Design Project For Engineers

The purpose of our project is to provide power line workers and linemen with a safe way to inspect the power lines. Our Aircraft is an UAV that is capable of surveying 200 linear miles in a normal working shift. The aircraft will be launched/landed and operated from an F-150 pickup truck with a facilitated launch mechanism attached. The aircraft must maintain an altitude of 150-400 ft. It will be recovered via net that will extend from the truck as the plane comes in for a landing, This will eliminate the need for landing gear. The goal for this project …

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Smart Flow Facility Analysis, Chantal Ann George, Pete Suktankar, Eric Wilson, Matthew Geiger Apr 2019

Smart Flow Facility Analysis, Chantal Ann George, Pete Suktankar, Eric Wilson, Matthew Geiger

Senior Design Project For Engineers

The SMART Flow Design Team has been tasked in providing a physical layout for a single building facility used to consolidate three separate business units. The objective for the new facility will be to manufacture, receive, ship, and store the company's finished products. When designing the physical layout, the team must take into consideration stable and seasonal business volumes, current and future volume demand growth, designated inbound, outbound, and storage areas, and product turn rates. All specifications must be met while determining an efficient flow of goods. The team has designed indoor and outdoor layouts using Microsoft Visio, performed various …

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Conceptual Design Of A Combat Search And Rescue Surveillance Unmanned Aerial Aircraft, Juan M. Chirinos-Paiz, Keegan J. Musser, Robert M. Zenko, Joshua Hunter Apr 2019

Conceptual Design Of A Combat Search And Rescue Surveillance Unmanned Aerial Aircraft, Juan M. Chirinos-Paiz, Keegan J. Musser, Robert M. Zenko, Joshua Hunter

Senior Design Project For Engineers

Unmanned aerial vehicles (UAV) are becoming more efficient and widely used. The military uses UAV’s because it greatly reduces civilian and combatant deaths and injuries. UAV’s also are used in search and rescue mission to find distress civilians. The team wanted to create an UAV for search and rescue missions and military applications. The aircraft needed to be compact, perform better than other UAV’s, and be low cost. The team did reach a successful aircraft that meet the design requirements. The aircraft was successfully sized around the electronics and allows utilization of additive manufacturing techniques. Project management techniques showed that …

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Stress-Induced Depolarization Of Single-Layer Pzt 95/5 Ferroelectric Films, Sergey I. Shkuratov, Jason Baird, Vladimir G. Antipov, Jay B. Chase, Wesley Hackenberger Apr 2019

Stress-Induced Depolarization Of Single-Layer Pzt 95/5 Ferroelectric Films, Sergey I. Shkuratov, Jason Baird, Vladimir G. Antipov, Jay B. Chase, Wesley Hackenberger

Mining Engineering Faculty Research & Creative Works

Ferroelectric (FE) films are widely used in electronic devices and low-power FE transducers. There is significant interest in expanding the usage of FE films to ultrahigh-power systems. The results are reported herein on experimental investigations of stress-induced depolarization of single-layer PbZr0.95Ti0.05O3 doped 2% Nb (PZT 95/5) poled FE films subjected to uniaxial adiabatic compression perpendicular and antiparallel to the direction of polarization. It was found that at a stress of 2.4 GPa, the 32-μm-thick films underwent a pressure induced transition to a nonpolar antiferroelectric phase and became completely depolarized in both modes of high strain …

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90 Day Kit Assessment, Sarah Abdullah, Karim Daoudi, Jennifer Rutledge Apr 2019

90 Day Kit Assessment, Sarah Abdullah, Karim Daoudi, Jennifer Rutledge

Senior Design Project For Engineers

Field Service Products (FSPA) in Atlanta, GA provides Siemens Energy, Inc., with tool sets and systems used to work on Power Generation Equipment. When the FSPA receives the tool systems back from the customer, there is a window of 90 days in which the FSPA must verify that the tool systems were returned complete and operational. If the verification process happens within the 90-day window and something is missing from the system, the FSPA can bill the customer for the missing or damaged items. If the tool system is verified outside of the 90-day window, the FSPA must replace any …

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Automated Generation Of Daily Evacuation Paths In 4d Bim, Kyungki Kim, Yong-Cheol Lee Apr 2019

Automated Generation Of Daily Evacuation Paths In 4d Bim, Kyungki Kim, Yong-Cheol Lee

Durham School of Architectural Engineering and Construction: Faculty Publications

Spatial movements of workers and equipment should be carefully planned according to project plans. In particular, it is crucial for workers’ safety to prepare emergency evacuation paths according to changing construction site configurations and construction progress. However, creating evacuation paths for all crews for each day can be an extremely labor-intensive task if it is done manually. Consequently, in most construction projects, evacuation plans are not provided to managers and crews throughout the entire construction. Even state-of-the-art technologies do not suggest ways to generate evacuation paths according to changing progresses presented in 4-Dimensional Building Information Model (4D BIM). This research …

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Foster Care Support Foundation Volunteer And Capital Outreach Analysis, Abeer Bhatti, Alexandro Martinez, Sunny Patel, Desmond Vail Apr 2019

Foster Care Support Foundation Volunteer And Capital Outreach Analysis, Abeer Bhatti, Alexandro Martinez, Sunny Patel, Desmond Vail

Senior Design Project For Engineers

Care Support Foundation (FCSF) provides free goods to children in Georgia. Annually, 11,000 volunteers are needed to deal with the massive influx of donations and fundraising events. Through our analyses, we aim to make recommendations to the FCSF, which can help raise funds and implement mitigating strategies that would increase funds and improve the foundation.

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Supply Chain Network Analysis For Outboard Motors At Motor Boaters Usa, Seyedalireza (Ali) Ghiasi, Chase Griffith, Djanene Manuel, Yesenia Pérez, Alvand Rafiee Apr 2019

Supply Chain Network Analysis For Outboard Motors At Motor Boaters Usa, Seyedalireza (Ali) Ghiasi, Chase Griffith, Djanene Manuel, Yesenia Pérez, Alvand Rafiee

Senior Design Project For Engineers

Motor Boaters USA found themselves possibly spending too much on their current network distribution of small and large outboard motors and requested new distribution alternatives for the U.S. Through past network distribution data analysis, the team devised 3 scenarios it believed would provide one or more cost effective distribution networks applicable to the request. Through what-if analysis, the teams' calculations produced solid results, which were then presented to Motor Boaters USA for reflection and possible implementation.

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Implementing Project Management Strategies To Enhance Productivity Within Non-Profit Organizations, Destiny Konan, Brooklyn Harper Apr 2019

Implementing Project Management Strategies To Enhance Productivity Within Non-Profit Organizations, Destiny Konan, Brooklyn Harper

Senior Design Project For Engineers

N-Ovate Ideals is working injunction with a non-profit organization, The MP Foundation, in an effort to optimize their event project management strategies. This process improvement project seeks to propose the implementation of a web-based project management and collaboration tool, Asana. Implementing this software will better assist this organization by tracking their project(s) from a centralized visual dashboard. N-Ovate Ideals seeks to demonstrate how this suggested tool will be able to improve productivity, reduce cost, and improve quality in their efforts to plan and manage projects and events.

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Public Blockchain Scalability: Advancements, Challenges And The Future, Amritraj . Apr 2019

Public Blockchain Scalability: Advancements, Challenges And The Future, Amritraj .

Master of Science in Software Engineering Theses

In the last decade, blockchain has emerged as one of the most influential innovations in software architecture and technology. Ideally, blockchains are designed to be architecturally and politically decentralized, similar to the Internet. But recently, public and permissionless blockchains such as Bitcoin and Ethereum have faced stumbling blocks in the form of scalability. Both Bitcoin and Ethereum process fewer than 20 transactions per second, which is significantly lower than their centralized counterpart such as VISA that can process approximately 1,700 transactions per second. In realizing this hindrance in the wide range adoption of blockchains for building advanced and large scalable …

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Driving Performances Assessment Based On Speed Variation Using Dedicated Route Truck Gps Data, Ying Li, Li Zhao, Laurence R. Rilett Apr 2019

Driving Performances Assessment Based On Speed Variation Using Dedicated Route Truck Gps Data, Ying Li, Li Zhao, Laurence R. Rilett

Department of Civil and Environmental Engineering: Faculty Publications

It was hypothesized that a driver is not safe when travel speed is too high and also not necessarily safe when travel speed is too low. Based on this hypothesis, this paper studied the risky driving performances by measuring speed variations of a driver’s recurrent trips in two perspectives: 1) driver profiles, which scored the risk on-road driving of each driver and 2) driving patterns, which reflected the risk speed patterns of a type of drivers. The proposed method was tested on a 30-day global positioning system (GPS) dataset, collected from 100 trucks. The study first split the raw dataset …

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