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Articles 271 - 282 of 282
Full-Text Articles in Engineering
Surface Resistance Measurements Of Superconducting Niobium Samples With A Triaxial Cavity, Paul Martin Boccard
Surface Resistance Measurements Of Superconducting Niobium Samples With A Triaxial Cavity, Paul Martin Boccard
Physics Theses & Dissertations
This experimental study has revealed and investigated many of the physical issues that affect accurate measurement of the surface resistance for small samples consisting of superconducting niobium films on copper substrates. It is believed that this work provides the groundwork for future research directed towards solving this important problem. Accurate measurement of surface resistance for such samples is needed to allow the rapid evaluation and optimization of the deposition parameters necessary for manufacturing low-loss superconducting niobium films.
A superconducting niobium triaxial cavity was investigated to determine its suitability for measuring the residual surface resistance of copper samples that were sputter-coated …
Multidisciplinary Sensitivity Analysis And Design Optimization Of Flexible Wings Using The Euler Equations On Unstructured Grids, Arunkumar Satyanarayana
Multidisciplinary Sensitivity Analysis And Design Optimization Of Flexible Wings Using The Euler Equations On Unstructured Grids, Arunkumar Satyanarayana
Mechanical & Aerospace Engineering Theses & Dissertations
Aeroelasticity is a classical discipline. However, even with recent advancement in computational technology, it still remains a challenging discipline. This is particularly true when aeroelasticity problems are solved in a loosely coupled manner. The advantage of a loosely coupled scheme is that the legacy codes of computational fluid dynamics (CFD) and computational structural mechanics (CSM) can be preserved and used as independent modules in solving the desired aeroelasticity problems. In such a scheme, maintaining proper data transfer (load transfer and deformation tracking between CFD and CSM codes) is crucial in ensuring successful coupled solutions. This can be a challenging task …
Studies Related To The Design Of A Magnetic Suspension And Balance System For An Ultra-High Reynolds Number Flow Facility, Oscar Magno Michael Gomeiz
Studies Related To The Design Of A Magnetic Suspension And Balance System For An Ultra-High Reynolds Number Flow Facility, Oscar Magno Michael Gomeiz
Mechanical & Aerospace Engineering Theses & Dissertations
The basic design principles for a magnetic suspension and balance system applied to the test section of an ultra-high Reynolds number facility are defined. The design of the cross-sectional area to be used in the test section is analyzed. The parameters of the permanent magnet to be used in the model inside the test section are investigated. The testing of magnetic fields at the center of a test pipe and validation of data by computer finite element analysis is described with the purpose of finding common results. The performance of the magnet configuration is evaluated with relation to the magnetic …
Efficient Dynamic Unstructured Methods And Applications For Transonic Flows And Hypersonic Stage Separation, Xiaobing Luo
Efficient Dynamic Unstructured Methods And Applications For Transonic Flows And Hypersonic Stage Separation, Xiaobing Luo
Mechanical & Aerospace Engineering Theses & Dissertations
Relative-moving boundary problems have a wide variety of applications. They appear in staging during a launch process, store separation from a military aircraft, rotor-stator interaction in turbomachinery, and dynamic aeroelasticity.
The dynamic unstructured technology (DUT) is potentially a strong approach to simulate unsteady flows around relative-moving bodies, by solving time-dependent governing equations. The dual-time stepping scheme is implemented to improve its efficiency while not compromising the accuracy of solutions. The validation of the implicit scheme is performed on a pitching NACA0012 airfoil and a rectangular wing with low reduced frequencies in transonic flows. All the matured accelerating techniques, including the …
Elasto-Plastic Responses Of Buried Pipeline Systems Under Wave Propagation, Yuean-Chen Lau
Elasto-Plastic Responses Of Buried Pipeline Systems Under Wave Propagation, Yuean-Chen Lau
Civil & Environmental Engineering Theses & Dissertations
The purpose of this research is to study the elastic and inelastic behavior of buried pipeline system under arbitrary seismic wave propagation. Both continuous and segmented pipes with joints and junctions are included. The surrounding soil is simulated by a series of elasto-plastic springs uniformly distributed longitudinally and laterally along the pipes. To the joints, elasto-plastic longitudinal springs and bilinear rotational springs are adopted. It is assumed that the pipes remain linearly elastic. The effects of soil liquefaction and fault movement are not considered.
Since the dynamic effect has been found to be negligible, a quasi-static analysis is adopted in …
Computational Modeling Of Airborne Noise Demonstrated Via Benchmarks, Supersonic Jet, And Railway Barrier, Moumen Idres
Computational Modeling Of Airborne Noise Demonstrated Via Benchmarks, Supersonic Jet, And Railway Barrier, Moumen Idres
Mechanical & Aerospace Engineering Theses & Dissertations
In the last several years, there has been a growing demand for mobility to cope with the increasing population. All kinds of transportation have responded to this demand by expanding their networks and introducing new ideas. Rail transportation introduced the idea of high-speed trains and air transportation introduced the idea of high-speed civil transport (HSCT). In this expanding world, the noise legislation is felt to inhibit these plans. Accurate computational methods for noise prediction are in great demand.
In the current research, two computational methods are developed to predict noise propagation in air. The first method is based on the …
Setpoint Tracking Predictive Control In Chemical Processes Based On System Identification, Sinchai Chinvorarat
Setpoint Tracking Predictive Control In Chemical Processes Based On System Identification, Sinchai Chinvorarat
Mechanical & Aerospace Engineering Theses & Dissertations
A Kraft recovery boiler in a pulp-paper mill provides a means for recovery of the heat energy in spent liquor and recovery of inorganic chemicals while controlling emissions. These processes are carried out in a combined chemical recovery unit and steam boiler that is fired with concentrated black liquor and which produces molten smelt. Since the recovery boiler is considered to be an essential part of the pulp-paper mill in terms of energy resources, the performance of the recovery boiler has to be controlled to achieve the highest efficiency under unexpected disturbances.
This dissertation presents a new approach for combining …
Developing Database Applications By Using Software Components, Nusret Conk
Developing Database Applications By Using Software Components, Nusret Conk
Legacy ETDs
Today, the software application development process is more assembly work than a "build from scratch" approach. By placing pre-existing software components together, it is possible to create a complete application. Such components provide interfaces so that programs use them for their intended purposes. The objective of this thesis is to illustrate how software components work together to make a complete application. To illustrate the ideas and the components, this project presents a three-tiered web database application. This application, as a whole, is made up of the client side web browser, a database and the actual application programs which are Java …
Enterprise Business Objects : Design And Implementation Of A Business Object Framework, Kai-Uwe Schafer
Enterprise Business Objects : Design And Implementation Of A Business Object Framework, Kai-Uwe Schafer
Theses
Software components representing business entities like customer or purchase order introduce a new way of Online Transaction Processing to business applications. Collaborating business objects allow to complete whole business processes as a single distributed transaction, instead of dividing it into queued steps, which sometimes even require user intervention. This IS due to the fact that business objects contain both business data and logic and that they incorporate multiple databases from different vendors and different geographic locations in a single transaction.
Business objects cannot be used as stand-alone components, but require a framework of services that manage persistence, concurrent transactions, and …
Loss Detection In The Dairy Industry., Michael Quealy
Loss Detection In The Dairy Industry., Michael Quealy
Theses
In any waste management program, the primary objective must be minimizing product loss without having an affect on product quality. Good waste management is recognized as good manufacturing practice and optimizes the processes to gain the highest possible yield from the available raw materials. A good waste management program must involve the daily monitoring of effluent from the plant for volume and strength. This data needs to be analyzed sufficiently to obtain clear pictures of what problems are present and where they are originating. If this is achieved then the task of reducing the product loss is made much easier. …
An Analysis Of Sustained Collaborative Research Activities Between University Organized Research Units And Industry: A Case Study Of Three Institutions, Elizabeth Taraski Mcdonnell
An Analysis Of Sustained Collaborative Research Activities Between University Organized Research Units And Industry: A Case Study Of Three Institutions, Elizabeth Taraski Mcdonnell
Seton Hall University Dissertations and Theses (ETDs)
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Optimization Of Insertion Holes And Anchor Design For Cylinder Shaped Toggle Type Suture Anchors, Adam Fedenia
Optimization Of Insertion Holes And Anchor Design For Cylinder Shaped Toggle Type Suture Anchors, Adam Fedenia
Masters Theses
This research was performed to optimize insertion holes and anchor design for cylinder shaped toggle type suture anchors. Four types of anchors were investigated in terms of pull strength and design in acrylic plate and pig bone. They included small type A and B anchors and large type A and B anchors.
Pull strength trends suggest that the small type anchors behave similarly since their external dimensions are identical, with the exception of type A anchor having a hole running from one end of the cylinder to the other like a pipe. It was found that the suture would fail …