Engineering Commons^™

Overview Of Ceramic Matrix Composite Research At Nasa Glenn Research Center, James D. Kiser Et Al, Joseph E. Grady, Craig E. Smith, Roy M. Sullivan, Valerie L. Wiesner, Janet B. Hurst, Steven M. Arnold, Dongming Zhu, Amjad S. Almansour, Ramakrishna T. Bhatt, Sreeramesh Kalluri, Sai Raj

Ceramic Matrix Composites: Science and Technology of Materials, Design, Applications, Performance and Integration

In support of NASA’s Aeronautics Research Mission, the Glenn Research Center in Cleveland, OH, has been developing and assessing the performance of high temperature SiC/SiC ceramic matrix composites (CMCs), both with and without protective coatings, for turbine engine applications. Combinations of highly creep-resistant SiC fibers, advanced 3D weaves, durable environmental barrier coatings (EBCs), and a 2700°F-capable hybrid SiC matrix have been evaluated. The effects of steam and thermal gradients on composite durability and means of monitoring and modeling damage are also being investigated. Additional studies focused on understanding the creep of SiC fibers and the behavior of SiC/SiC minicomposites that …

Updated Composite Materials Handbook-17 (Cmh-17) Volume 5 - Ceramic Matrix Composites, James Doug Kiser, Rachael Andrulonis, Cindy Ashforth, Kaia E. David, Curtis Davies

Ceramic Matrix Composites: Science and Technology of Materials, Design, Applications, Performance and Integration

A wide range of issues must be addressed during the process of certifying CMC (ceramic matrix composite) components for use in commercial aircraft. The Composite Materials Handbook-17, Volume 5, Revision A on ceramic matrix composites has just been revised to help support FAA certification of CMCs for elevated temperature applications. The handbook supports the development and use of CMCs through publishing and maintaining proven, reliable engineering information and standards that have been thoroughly reviewed. Volume 5 contains detailed sections describing CMC materials/processing, design/analysis guidelines, testing procedures, and data analysis and acceptance. A review of the content of this latest revision …

High Temperature Composite Overview In France, Marc Montaudon, Eric Bouillon

Ceramic Matrix Composites: Science and Technology of Materials, Design, Applications, Performance and Integration

Exactly 40 years after the first production of a high temperature composite material in France, this presentation recalls the history of the development of the related technologies and applications.

We will describe how, under the leadership of Société Européenne de Propulsion (SEP) until 1994 and since then of the SAFRAN Group, different families of composites were successively developed and brought to an industrial stage: carbon fibers reinforced carbon, carbon fibers reinforced ceramic, ceramic fibers reinforced ceramics, reaching in 2017 a total volume of production of more than 1,000 metric tons per year.

Please click Additional Files below to see the …

Learning To Predict Clinical Outcomes From Soft Tissue Sarcoma Mri, Hamidreza Farhidzadeh

USF Tampa Graduate Theses and Dissertations

Soft Tissue Sarcomas (STS) are among the most dangerous diseases, with a 50% mortality rate in the USA in 2016. Heterogeneous responses to the treatments of the same sub-type of STS as well as intra-tumor heterogeneity make the study of biopsies imprecise. Radiologists make efforts to find non-invasive approaches to gather useful and important information regarding characteristics and behaviors of STS tumors, such as aggressiveness and recurrence. Quantitative image analysis is an approach to integrate information extracted using data science, such as data mining and machine learning with biological an clinical data to assist radiologists in making the best recommendation …

Conflict Reduction Techniques For Gpu Transactional Memory Systems, Sui Chen

LSU Doctoral Dissertations

The continued evolution of GPUs have enabled the use of irregular algorithms which involve fine-grained data sharing between threads, as well as transaction processing applications such as databases. Transactional Memory (TM) is derived from databases, which by itself is a programming construct that simplifies the programming of parallel workloads and combines the advantages of traditional approaches including fine-grained and coarse-grained locking. While hardware support for TM has started to enter mainstream commodity products, it is much farther from becoming reality on the GPU and is still being researched. In this dissertation, we study the challenges for supporting transactional workloads on …

Load Planning Processes To Enhance Cargo Compartment Utilization, Nathan J. Carlson, Adam D. Reiman, Robert E. Overstreet, Matthew A. Douglas

Faculty Publications

Purpose: The United States Air Force often provides effective airlift for cargo distribution, but is at times inefficient. This paper aims to address the under-utilization of military airlift cargo compartments that plagues the airlift system.
Design/methodology/approach: The authors examine seven techniques designed to increase cargo compartment utilization and increase airlift utilization rates. The techniques were applied through load planning software to 30 real-world movements consisting of 159 sorties. They then ran each post-technique movement through a modeled flight environment to obtain cycle movement data. The metrics gained from both the load planning software and the modeled environment were regressed to …

Modeling Of Thermally Aware Carbon Nanotube And Graphene Based Post Cmos Vlsi Interconnect, K M Mohsin

LSU Doctoral Dissertations

This work studies various emerging reduced dimensional materials for very large-scale integration (VLSI) interconnects. The prime motivation of this work is to find an alternative to the existing Cu-based interconnect for post-CMOS technology nodes with an emphasis on thermal stability. Starting from the material modeling, this work includes material characterization, exploration of electronic properties, vibrational properties and to analyze performance as a VLSI interconnect. Using state of the art density functional theories (DFT) one-dimensional and two-dimensional materials were designed for exploring their electronic structures, transport properties and their circuit behaviors. Primarily carbon nanotube (CNT), graphene and graphene/copper based interconnects were …

Conference Program, Yutaka Kagawa, Dongming Zhu, Ram Darolia, Rishi Raj

Ceramic Matrix Composites: Science and Technology of Materials, Design, Applications, Performance and Integration

No abstract provided.

The Potential Of Plasma Activation For Eb-Pvd Of Ebc Systems On Cmc Components, Burkhard Zimmermann, Gösta Mattausch, Bert Scheffel, Jens-Peter Heinß, Frank-Holm Rögner, Christoph Metzner

Ceramic Matrix Composites: Science and Technology of Materials, Design, Applications, Performance and Integration

Gas turbines are subject of intense research and development in order to meet increasing demands on fuel efficiency, reduction of emissions, or enhanced power. One of the major keys is improving the thermal efficiency by increased gas temperature within the turbine. In the hot turbine section, nickel-based superalloy components with thermal barrier coatings are utilized, which are still being refined and improved. Nevertheless, in order to significantly increase temperature capability and turbine efficiency, silicon-based non-oxide ceramics are being investigated and introduced as new base materials, allowing for lower-weight components operating at elevated temperatures. Severe weight losses due to water vapor …

2015 - Salinas River Watershed Area Salt Modeling Assessment Prepared For California Central Coast Regional Water Quality Control Board And The U.S. Environmental Protection Agency, Region Ix

Miscellaneous Monterey and San Luis Obispo County Documents and Reports

A November 2015 report prepared by Tetra Tech for California Central Coast Regional Water Quality Control Board and the U.S. Environmental Protection Agency, Region IX. The purpose was for the informed development of salt-related TMDLs by the CCRWQCB and a salt and nutrient management plan for the Salinas Valley aquifers. Three reaches reported 2010 303(d) listings for salt-related impairments in these watersheds including impairments due to chloride, sodium, electrical conductivity, and total dissolved solids – Lower Salinas River, Santa Rita Creek, and Alisal Creek. This report provides data analysis and a literature review (Sections 1 through 5), development of a …

Green Synthesis Of Copper Oxide Nanoparticles In Aqueous Medium As A Potential Efficient Catalyst For Catalysis Applications, Hany A. Elazab Dr

Chemical Engineering

In this research, we have developed a reliable green method for the synthesis of copper oxide nanoparticles as a potential efficient catalyst for several catalysis applications. In our experimental approach, microwave-assisted synthesis technique was used in order to perform chemical reduction of copper salt using hydrazine hydrate as a strong reducing agent. The prepared catalyst was characterized using various techniques showing the formation of well dispersed copper oxide nanoparticles. The synthesized Copper oxide catalyst shows many advantages including the use of environmentally benign solvent systems,

Performance Results Of Using Waste Vegetable Oil Based Biodiesel Fuel In A Turboshaft Gas Turbine Engine, Donald Bartlett 5218591, Blaine M. Heisner

ASA Multidisciplinary Research Symposium

The purpose of this research is to record and compare the operating parameters of a turboshaft gas turbine engine using two different blends of biodiesel fuel and the standard Jet A fuel.

What Happens To Nox Emissions Of Vw Diesel Cars When Water/Methanol Injection Is Used?, Andrew Croxell

ASA Multidisciplinary Research Symposium

Volkswagen has come under fire for their "Clean Diesel" automobiles that were found to emit too much NOx (Oxides of Nitrogen) when driven on the street. Since NOx is created by high temperature combustion events, the addition of a water/methanol injection system was tested on a VW diesel vehicle to identify if it could cool combustion temperatures and thus reduce NOx to an acceptable specification.

Advanced Multi-Speed Transmissions And Their Effect On Fuel Economy, Durability And Reliability, Sean Boyle

ASA Multidisciplinary Research Symposium

In a challenge to meet the high corporate average fuel economy (CAFE), manufacturers are using transmissions with 8, 9, and 10 speeds. This oral presentation addresses vehicle fuel economy impact with advanced multi-speed transmissions and also forecasts the reliability and durability when compared to a conventional 5 and 6-speed transmission.

Progress Towards An Opposed Piston Two Stroke Gasoline Aviation Engine, Donald R. Morris

ASA Multidisciplinary Research Symposium

Opposed Piston Engine Technology is not new, but its application to small two-stroke gasoline engines is unexplored. This presentation explores the potential advantages of such an engine as well as progress towards a workable design.

Uas (Unmanned Aircraft Systems): Challenges And Opportunities, Andy Wang

ASA Multidisciplinary Research Symposium

Experts in UAS (drones) applications and R&D will discuss new business applications, business opportunities, and latest R&D results.

2fly With Rpi - Evaluating The Raspberry Pi For Glass Cockpit Applications, Donald R. Morris

ASA Multidisciplinary Research Symposium

Evaluating the capabilities of Raspberry Pi computers to be used in embedded glass cockpit applications for experimental aircraft. This includes details of what is required for these applications as well as how well the Raspberry Pi 3B can perform in this role.

Aviation Origin Stories: A Qualitative Inquiry Into The Factors That Influenced Of Aviation Students To Choose Their Field Of Study, Matthew J. Romero, Steven C. Goetz

ASA Multidisciplinary Research Symposium

This study describes the various ways aviators come to believe aviation is a viable career field. The inquiry aims to understand the difference in ways the students from different genders, socioeconomic classes, and races come to the conclusion that aviation is a good field of study for them to pursue.

Comparison Of New Metrics For Assessment Of Risks Of Occupational Noise, Wisam Al-Dayyeni, Jun Qin

ASA Multidisciplinary Research Symposium

The acoustic environment nowadays is filled with excessive noise sources. Here, we will compare the conventional noise metrics(A-weighting and C-weighting) with our two developed advanced models (the adaptive weighting (F-weight) and the complex velocity level (CVL) auditory fatigue model).

Extracurricular Undergraduate Research: Student Perspectives And Experiences, Steven Goetz, Matthew Romero, Michael Robertson

ASA Multidisciplinary Research Symposium

This qualitative research examined the experiences and perspectives of undergraduate researchers to understand why they engaged in their research, what benefits they gained from the experience, and what challenges they faced in the conduct of their research.

A Smart Internet Of Things (Iot) Prototype For Accurate People Counting Towards Energy Efficient Buildings, Qian Huang, Kane Rodriguez, Chao Lu

ASA Multidisciplinary Research Symposium

According to the U.S. Department of Energy, 30% of the energy used in commercial buildings is wasted. If the number of humans in each pre-determined thermal zone is aware, a building automation system (BAS) is able to intelligently adjust HVAC operation for each thermal zone to provide “just-enough” heating, cooling and ventilation to building users. Therefore, a people counting device that can be widely deployed with low price and failure rate, small form-factor, good usability, and conserved user privacy is highly desirable. Existing room occupancy detection sensors (e.g., passive infrared, camera, acoustic, RFID, CO₂) cannot meet all these …

Factors Influencing Student Selection Of A Collegiate Aviation Program, Matthew J. Romero, Jose R. Ruiz Ph.D.

ASA Multidisciplinary Research Symposium

This study aims to identify the most influential characteristics that drive undergraduate students to select collegiate aviation flight programs in the US. Using preference aggregation techniques, a list of the most influential attributes is created as a result of the investigation.

Fdm Machine Learning: An Investigation Into The Utility Of Neural Networks As A Predictive Analytic Tool For Go Around Decision Making, John Bro

ASA Multidisciplinary Research Symposium

FDM MACHINE LEARNING: An investigation into the utility of neural networks as a predictive analytic tool for go around decision making.

Individual And Community Well-Being In Nonmetropolitan Nebraska: 2017 Nebraska Rural Poll Results, Rebecca J. Vogt, Cheryl A. Burkhart-Kriesel, Randolph L. Cantrell, Bradley Lubben, L. J. Mcelravy, T. L. Meyer

Rural Futures Institute: Publications

Conclusion

By many different measures, rural Nebraskans are positive about their community. Many rural Nebraskans rate their community favorably on its social dimensions: as friendly, trusting and supportive. Most rural Nebraskans say it would be difficult to leave their community and have a positive attachment to their community. And, most rural Nebraskans disagree that their community is powerless to control its future.

Across all years of this study, rural Nebraskans’ views about the change in their community have generally been positive. The proportion believing their community has changed for the better during the past year has usually been greater than …

A Strategic Development Of Alternative Fuel Initiation And Its Adaptation In A Developing Country : A Feasibility Study On Methanol Fuelled Domestic Passenger Ships In Indonesia, Eko Maja Priyanto

World Maritime University Dissertations

No abstract provided.

A Decision Support System For Ship’S Energy Efficient Operation : Based On Artificial Neural Network Method, Yasser Bayoumy Abdelwahab Farag

World Maritime University Dissertations

No abstract provided.

A Case Study : An Economic Evaluation Of Liqufied Natural Gas (Lng) Fuel For New Ships Of Korean Ship Owners, Hyuntae Kim

World Maritime University Dissertations

No abstract provided.

Lng As A Marine Fuel In Malta : Case Study : Regulatory Analysis And Potential Scenarios For Lng Bunkering Infrastructure, Mark Philip Cassar

World Maritime University Dissertations

No abstract provided.

A Study On The E-Navigation Modus Operandi, Nurma Karima Sari

World Maritime University Dissertations

No abstract provided.

Optimising Energy Efficiency : Split Incentives In The Context Of The Implementation Of Seemp, Edwin Nii Oduah Mensah

World Maritime University Dissertations

No abstract provided.