Index Catalog // ScholarsArchive@OSU

Optimization of Pulsed Laser Deposited Piezoelectric Thin Films for Microelectromechanical Systems

Creator:: Kearney, Dylan R.
Abstract:: Lead zirconate titanate (PZT) is well known to exhibit some of the strongest piezoelectric responses, explaining why it is at the heart of piezoelectric-based microelectromechanical systems (MEMS) research. The use of pulsed laser deposition (PLD) to synthesize PZT offers many advantages over alternative deposition techniques, mainly regarding its ability to...
Resource Type:: Honors College Thesis
Full Text:: ] ....................................................................................................................... 11 Figure 9: Example hysteresis loop with remanent polarization (Pr) and coercive field (Ec

Isothermal transformation of aluminum bronze

Creator:: Stone, Etric Lee
Resource Type:: Masters Thesis
Full Text:: 963 164 950- '5.4 6, ¿7 3 o o 850- c 800- ; 785°" f-. 3.6 c:Z 750- LiJ a 700- 0< 650

Two projectiles connected by a flexible tether dropped in the atmosphere

Creator:: Frost, Geoffrey W.
Abstract:: This study investigates the atmospheric flight dynamics of a munition system and the effect of a tether reel resistance mechanism for limiting the impact that the unreeling process has on the munition system. The munition system consisting of two projectiles connected by a tether line is released from an aircraft...
Resource Type:: Masters Thesis

The effect of alpha phase morphology on the impact energy of commercial purity titanium

Creator:: York, James Michael
Abstract:: Samples of commercial purity titanium were heat treated above the beta transformation temperature and within the two phase alpha-beta phase field, followed by cooling at varying rates. Testing of the samples in tension and by instrumented impact indicated that some strengthening could be imparted by these heat treatments, although at...
Resource Type:: Masters Thesis
Full Text:: °C for 1 hr. 730 553 177 21.5 37.2 95.7 -Water Quench 748 587 161 23.5 39.0 920°C for 1 hr. 650 433

Unmanned Aerial Vehicle Propulsion

Creator:: Brown, Sean
Abstract:: There is a growing US interest in UAVs for many applications ranging from agriculture to military. One area of improvement that can be realized in each category is propulsion. Engines with greater efficiency would result in longer mission duration, leading to cost savings and increased usefulness for UAV owners and...
Resource Type:: Honors College Thesis
Full Text:: Airbus A350 Midsize Transport 650 Turbofan Boeing 787 Midsize Transport 484 Turbofan Airbus A400M

Proportional integral derivative control of an oil-heated fractal-like branching microchannel desorber

Creator:: Davis, Keith R.
Abstract:: A PID controller was designed to control the performance of an oil-heated fractal-like branching microchannel desorber for use in an ammonia-absorption refrigeration system. Both the amount and concentration of ammonia refrigerant generated at the desorber can be controlled by choosing the rectified circulation ratio as the controlled variable in a...
Resource Type:: Masters Thesis

Creep studies on Pheasant, Narcissus and Chukar aluminum conductors

Creator:: Patton, John Dennis
Abstract:: This thesis is an engineering report on the creep behavior of power transmission line conductors. Laboratory creep test results are reported for Pheasant, Narcissus and Chukar conductors. The report follows a standard nomenclature and format suggested by the International Study Committee No. 6 of Conference Internationale des Grands Reseaux Electriques...
Resource Type:: Masters Thesis
Full Text:: - aluminum conductors are fabricated from strands of EC grade aluminum, hard drawn to ASTM specification

A study of the characteristics of oscillatory surface instabilities leading to droplet formation

Creator:: Daniels, Brian J.
Abstract:: The characteristics of the free surface in an orifice driven by a periodic forcing function have been studied both theoretically and experimentally. In the theoretical study, two wall boundary condition cases were examined: 1) the radial velocity at the wall of the orifice is zero; and 2) the axial velocity...
Resource Type:: Masters Thesis
Full Text:: ; 51Horizontal Pixel Numbers a) 500, b) 650, and c) 800 10 Detail View of Intensity Profiles of Pixel Columns in

Heat transfer coefficient of boiling ammonia in an incline tube

Creator:: Holstege, Conrad Johan Marie
Resource Type:: Masters Thesis
Full Text:: tube N ABSTRACT OF TBE TiSIS OF Ho1stee Çord_Jo nJIre_ for the ._ in_ ec rir (NaeT Degree) Major

The effect of small amounts of magnesium on the superplastic behavior of an aluminum-zinc alloy

Creator:: Abbott, Vaughn William
Abstract:: The base Al-Zn superplastic alloy was investigated at 250°C to determine the effect of small amounts of magnesium on mechanical properties. Six alloys of nominal composition 0.00, 0.10, 0.25, 0.50, 0.75, and 1.00 weight percent magnesium, constant 78 weight percent zinc, and variable 21 to 22 weight percent aluminum were...
Resource Type:: Masters Thesis
Full Text:: (24), a 1945 tech- nical paper by Bochvar and Sviderskaya reported that elongations of up to 650

Partial recirculation of diesel engine exhaust for the reduction of oxides of nitrogen

Creator:: Addicott, Donald James
Abstract:: Oxides of nitrogen are a concern as effluents to atmospheres because they participate in photochemical reactions which produce smog, because they attenuate sunlight which gives the atmosphere a reddish brown cast, and because of their toxic properties and the health hazards associated with the photochemical products they produce. Oxides of...
Resource Type:: Masters Thesis
Full Text:: 1i. Ca ses as K - - 1, 800 750 700 650 600 á 550 0 500 tU 450 0 z

Modeling the thermal effects of fabricated fuel-to-cladding gap in fast reactor fuel

Creator:: Baker, Ronald Blair
Abstract:: This report presents a refined method for the calculation of fuel centerline temperatures and the linear-heat-rating-to-incipient melting, ' Q'[subscript m], of mixed-oxide fuel typical of that to be used in the Fast Flux Test Facility and in Liquid Metal Fast Breeder Reactors. Of primary concern are the effects of the...
Resource Type:: Masters Thesis

A portable dual-range fuel flowmeter for automotive research

Creator:: Hodgkins, Chester
Abstract:: This describes the development of a new fuel flowmeter. Among the desired features were an accuracy of ±2%, a linear response to fuel flow rate, a means of increasing the sensitivity at the low end of the meter scale and portability so that it would be equally useful in the...
Resource Type:: Masters Thesis
Full Text:: . Referring to Figure 3, this proves to be 4. 25 x lO-6 trzl"ec at 9Oof . A sarnple calculation may be found

An experimental study of natural convection in air between a vertical isothermal flat plate and a parallel insulted flat plate

Creator:: Lee, Soon Mo
Abstract:: The free convective heat transfer phenomena in air between two vertical plates 24 by 38 inches spaced 15.895 mm apart, was investigated in this experimental study. One plate was isothermal and, the other adiabatic. A quartz fiber anomometer was used for measuring local velocities in the air between the vertical...
Resource Type:: Masters Thesis
Full Text:: / .ec avc . n x = 21 in. = 28. ec 11011111111111111111 . - . .2 .3 .4 y/L .5 .6

Periodic system analysis with application to wind turbines

Creator:: Bahrami, Mohsen
Abstract:: An algorithm is developed to compute the time averaged, output statistics of a linear system with periodic coefficients forced by stationary white noise. The algorithm makes use of Floquet theory and introduces the averaged system dynamics matrix to obtain more favorable numerical performance. The time series approach to averaged statistics...
Resource Type:: Dissertation

Laboratory creep studies on "Pheasant" and "Expanded" aluminum conductors

Creator:: Wilson, Laurence Martin
Resource Type:: Masters Thesis
Full Text:: Engineering In Charge of Major Head of epartment of ec nica ngineering Chairman of School Graduate

Creep studies on "Expanded," "Chukar," and "Drake" aluminum conductors

Creator:: Shen, Yuan-shou
Abstract:: This thesis presents the creep properties and the relations between stress and strain of "Expanded 460KV", "Chukar" and "Drake" conductors. The basic theories of the effect of load, material, and temperature on the conductor are also briefly discussed. The long time creep curve of a conductor appears as a straight...
Resource Type:: Masters Thesis
Full Text:: consisting of one or more layers of concentric-lay stranded Electrical Conductor (EC) grade hard drawn

System of zirconium-tantalum alloys zirconium rich portion

Creator:: Kleint, Roderic Emil
Resource Type:: Masters Thesis
Full Text:: . 5o ec i mens Tue alloys used. were supplied through tne courtesy of the United $tates Bureau of

The effect of the forming properties of aluminum alloy 75S on aircraft construction

Creator:: Berlin, Edgar David
Resource Type:: Masters Thesis
Full Text:: use of 75S-T. As a result the wing was made sixteen percent stronger and 650 pounds lighter (15, p

Rational Fuel Design for Low Temperature Internal Combustion Engines

Creator:: Daly, Shane R.
Abstract:: This work introduces a new methodology to design transportation fuels offering improved efficiency and reduced emissions, aimed to complement both traditional and emerging engine technologies. Many of these emerging technologies are centered around exploiting low temperature combustion (LTC) strategies that offer improved efficiency and reduced emissions. However, a standardized fuel...
Resource Type:: Dissertation

Computational Modeling of Smoldering Combustion in Wildland Fuels

Creator:: Jayasuriya, Waduge Jayani A.
Abstract:: Smoldering combustion in wildland fires is a critical phenomenon that needs in-depth study because it can initiate with weaker ignition sources, can persist for long periods, is difficult to suppress, and can transit to flaming combustion. Cellulose, hemicellulose, and lignin are the major organic constituents within biomass, in varying proportions...
Resource Type:: Dissertation

From running birds to walking robots : optimization as a unifying framework for dynamic bipedal locomotion

Creator:: Hubicki, Christian M.
Abstract:: Bipedal locomotion is a complex phenomenon to understand and control, making it difficult for legged robots to achieve the speed, agility, efficiency, and robustness of their animal counterparts. This thesis argues for the use of numerical optimization to investigate and implement bipedal control as it applies to biology, dynamical models,...
Resource Type:: Dissertation
Full Text:: experiment were around 650 N. Stance phase of the leg torques indicates an initial braking phase (average

Characterization of flow boiling in a fractal–like branching microchannel network

Creator:: Edward, Lee M.
Abstract:: Based on experimental investigations the present study evaluates flow instability and void fraction in a fractal-like branching microchannel network with rectangular cross-section. The hydraulic diameter of the channels ranged from 308μm at the inlet to 143μm at the outlet. The flow network used is characterized by set branching ratios for...
Resource Type:: Masters Thesis

Generalized Preconditioning to Accelerate Simulations with Large Multiphase Chemical Kinetics Models

Creator:: Walker, Anthony S.
Abstract:: Combustion emissions produced from burning real transportation fuels have many environmental impacts. However, detailed chemistry across multiple phases, time scales, and thermodynamic conditions make predicting combustion emissions challenging. Detailed modeling of the gas phase alone is prohibitively expensive, due to the large size and stiffness of the kinetic models. The...
Resource Type:: Dissertation

Experimental Study of the Impact of Physical and Chemical Properties on Smoldering Combustion in Natural Fuels

Creator:: Smucker, Benjamin
Abstract:: Smoldering combustion in wildland fires is difficult to extinguish, can transition to flaming combustion, and produces a significant amount of pollutants. It is necessary to understand parameters controlling smoldering in order to help predict the smoldering behavior and potentially mitigate these hazards. The wide variety of natural fuels that occur...
Resource Type:: Dissertation

A numerical solution for heat transfer to non-Newtonian fluids with temperature-dependent viscosity for arbitrary conditions of heat flux and surface temperature

Creator:: Cochrane, G. F. (Glenn Frank)
Resource Type:: Dissertation

Integrated dual cycle energy recovery using thermoelectric conversion and an organic Rankine bottoming cycle

Creator:: Miller, Erik W.
Abstract:: Hot engine exhaust and industrial process exhaust represents a resource that is often rejected to the environment without further utilization. This resource is prevalent in the transportation and industrial process sectors, but stationary engine-generator systems also typically do not utilize this resource. Engine exhaust is considered high grade heat and...
Resource Type:: Masters Thesis
Full Text:: iQ mC T T= − (2.3) ( ), , ,c p c h i c iQ mC T T= − (2.4) minQ eC= (2.5) 12

Thermal and seismic analysis of piping systems using classical methods

Creator:: Nisargand, Arun L.
Abstract:: "Piping Design and Engineering" first published in 1963 by Grinnell, Co. is widely used by engineers to perform approximate thermal stress analysis of high-temperature piping systems. The text consists of numerical constants to calculate end reactions and maximum bending stresses in a variety of piping configurations from known properties of...
Resource Type:: Masters Thesis
Full Text:: leg BC. nwL 2 MFAB MFBC 12 ' nwL 2 2E1m - -BC 12 L ( 2e B ) nwL 2 4E10 + B 12 L ec = 0 (6.1

Laminar microchannel cooling of integrated circuits

Creator:: Lienau, Jeffrey Jay
Abstract:: Liquid cooled, laminar microchannel heat sinks were earlier proposed by Tuckerman for cooling high heat generating integrated circuits and high power microwave generation systems using photoconductive switches. A method of computationally analyzing the heat sinks is presented which produces the desired temperature and velocity distributions within the heat sinks. The...
Resource Type:: Masters Thesis
Full Text:: temperature ec at height z [W/(m2K)] -k0T/vIwall) Twall(x,z) ec(x,z) = Height of the flow channel [gm

A design framework for identifying automation opportunities

Creator:: Nagel, Robert Lewis, 1982-
Abstract:: Since the Industrial Revolution, automated systems have increasingly become a part of everyday life. Automated systems range in scale and scope from simple assists to complete robotic replacements. Inexpensive integrated circuits, sensors and microprocessors have allowed automated systems to become smaller, cheaper and more prevalent. Identifying appropriate opportunities for automation,...
Resource Type:: Dissertation

An experimental investigation of radiative and total heat transfer around a horizontal tube immersed in a high temperature gas-solid fluidized bed

Creator:: Alavizadeh, Seyed Nasser
Abstract:: This study is primarily concerned with the measurement of the local radiative component of total heat transfer around a horizontal tube immersed in a large particle fluidized bed at elevated temperatures.Total heat transfer was also measured in order to assess the relative radiation contribution.The radiation measurement probe employs a silicon...
Resource Type:: Dissertation

Experimental investigation of wood combustion and combustion profiles in a cylindrical combustion chamber

Creator:: Dadkhah-Nikoo, Abbas
Abstract:: This study presents the results of an experimental investigation of wood combustion. Variables chosen for investigation were fuel feed rate, fuel moisture content, fuel particle size, excess air, fraction and temperature of under-fire air. Data recorded during the experiments included the composition and temperature of the combustion products in the...
Resource Type:: Dissertation
Full Text:: , respectively, for 1 cm and 2 cm parti- cles. 33 500 650 450- 600 400- -550 -16_350- 500 OC) 2 300

A model reference adaptive system for control of a flexible mechanical manipulator

Creator:: Lee, Byeung Kyun
Abstract:: For control of a flexible manipulator, the assumed- mode method is applied to the mathematical model of the model reference adaptive system. In the assumed-mode method, the flexible, continuous manipulator is described by a limited number of degrees of freedom. A modified model reference adaptive system is studied for direct...
Resource Type:: Dissertation
Full Text:: follows: [c] = Ec(2S1W!) ([m]{1.}0 ([m]{u}i)T . (2.3.64) i=1 MI - The Equation (2.3.64) can then be

Characterization of Two Novel Machining Processes for Difficult to Machine Materials

Creator:: Doran, Michael P.
Abstract:: New materials with superior mechanical properties, such as increased strength and hardness, have been developed to allow for new and improved products. However, the mechanical properties that make these materials useful also makes them difficult to process using conventional methods. New machining processes need to be developed to generate products...
Resource Type:: Masters Thesis

A pipe entry length solution for heat transfer and flow in Powell-Eyring fluids with temperature-dependent viscosity and constant flux boundary condition

Creator:: Etchart, David Ygnacio
Resource Type:: Masters Thesis

Strain rate sensitivity index of thermoplastics from variable strain rate and stress relaxation testing

Creator:: Goble, David Leroy
Resource Type:: Masters Thesis

Comparison of European and American heavy machinery design, manufacturing, and economics influencing licensing agreements

Creator:: Gayer, George Frederick William
Resource Type:: Masters Thesis
Full Text:: :UL:T U i . i-ir - - j9'y J'1', (//'I/ - _ GA 32 650 Hß1 440rp I i 11.7 Su1or G-32

A simplified model of heat transfer between large-particle gas-fluidized beds and immersed surfaces

Creator:: Bakke, Paul D.
Abstract:: A simplified model of the combined particle convective and radiative components of heat transfer between large-particle gas-fluidized beds and immersed surfaces was developed. This analytical model was based on the single particle formulation of Adams and Welty [4,9], with the added assumptions of one-dimensional heat conduction in the particle and...
Resource Type:: Masters Thesis

Reduced order modeling of legged locomotion in the horizontal plane

Creator:: Wickramasuriya, Gamika Arun
Abstract:: Sprawled-posture insects exhibit a remarkable ability to rapidly run in a stable manner over complex terrain, a feat that has yet to be equaled by man-made legged robots. Recent experimental results suggest that these insects may employ a hierarchical control structure, in which locomotion performance emerges from a combination of...
Resource Type:: Dissertation

Off-design analysis and control of a wood-fired combined-cycle power plant

Creator:: Brawn, Robert Charles
Abstract:: This report presents the off-design analysis of various wood-fired combined-cycle power plants using a computer model to simulate plant performance. The combined-cycle systems investigated are characterized by having a woodfueled combustor, an indirect-fired gas turbine, and a Rankine steam cycle. This work was conducted as part of a larger biomass...
Resource Type:: Masters Thesis

Experimental studies of heat transfer with an array of horizontal tubes immersed in a high-temerature fluidized bed

Creator:: Goshayeshi, Ali
Abstract:: An experimental study is described in which time-average local heat transfer coefficients were obtained for arrays of horizontal tubes immersed in a hot fluidized bed. Spatial-averaged heat transfer coefficients, computed from local values, are also reported. Refractory particles with surface mean diameters of 2.14 mm and 3.23 mm were fluidized...
Resource Type:: Dissertation

Analysis and simulation of dual-source heat pumps with three-fluid evaporators

Creator:: Lee, Jai-hyo
Abstract:: When the ambient temperature drops, air-source heat pumps deliver less heating per unit of power input and usually cannot provide for the heating load. Therefore, dual-source heat pumps can offer an attractive alternative. In the context of this work, a dual-source heat pump operates as an air-source unit under normal...
Resource Type:: Dissertation

The Influence of Fuel Characteristics on Smoldering Behavior through Porous Fuels

Creator:: Ross, Andrew H.
Abstract:: Smoldering can play a dangerous role in the ignition and spread of wildfires. Naturally occurring fuels consist of multiple layers of organic materials with varying particle sizes due to differences in decomposition stages with fuel depth, yet the influence of particle size on burning behavior is poorly understood. Previous research...
Resource Type:: Masters Thesis
Full Text:: camera to temperatures used in the data analysis. Black body temperatures ranging from 40°C to 650°C

Numerical design of a high-flux microchannel solar receiver

Creator:: Rymal, Charles
Abstract:: This thesis discusses the design of several microchannel solar receiver devices for use in CSP (concentrated solar power) using CFD (computational fluid dynamics) simulations. The goal is to demonstrate that, by taking advantage of the higher heat transfer coefficienct of microchannels, solar receivers can achieve higher efficiency than current receiver...
Resource Type:: Masters Thesis
Full Text:: inlet and outlet tempera- tures for SCO2 are 500 and 650 C (773 and 923 K). This requirement is based

An analytical model of radiative and convective heat transfer in small and large particle gas fluidized beds

Creator:: Fatani, Abdulhadi Ahmed
Abstract:: A complete analytical model of radiative and convective heat transfer to a horizontal tube in small and large particle gas fluidized beds has been developed. In the model the bed of particles consists of an emulsion phase and a bubble phase. The emulsion phase is approximated by a series of...
Resource Type:: Dissertation

Reduced condensing pressure operation in industrial ammonia refrigeration systems

Creator:: Wilcox, Marcus H.
Abstract:: A computer model was created using compressor and condenser performance data to simulate vapor-compression ammonia refrigeration system performance under various operating conditions and strategies. The model was used to estimate energy, demand, and cost savings resulting from reduced condensing pressures. Two ammonia refrigeration systems were selected for the investigation into...
Resource Type:: Masters Thesis
Full Text:: . Pressure Receiver Condenser Expansion Device Ec 0 Liquid Pump High- Stage Compressor Inter. Press

Hydrodynamics of droplet impingement on heated surfaces : effects of nanofluid and nano-structured surface

Creator:: Shen, Jian
Abstract:: This study investigates the hydrodynamic characteristics of droplet impinging on heated surfaces using High Speed High Resolution (HSHR) imaging and evaluates the effect of surface temperature and using water and a nanofluid on a polished and a nano-structured surface. Three types of surfaces are used in the study: polished silicon,...
Resource Type:: Dissertation

A theoretical study of the radiative contribution to heat transfer between a high-temperature, large-particle gas-fluidized bed and an immersed tube

Creator:: Mahbod, Bahram
Abstract:: An analytical model of the radiative contribution to the total heat transfer between a large-particle (greater than 1 mm) gas-fluidized bed and an immersed horizontal tube is discussed. The model is applied to the case of a bubbling bed and the emulsion phase contribution is obtained from a detailed analysis...
Resource Type:: Dissertation

A risk-informed decision making framework accounting for early-phase conceptual design of complex systems

Creator:: Van Bossuyt, Douglas L.
Abstract:: A gap exists in the methods used in industry and available in academia that prevents customers and engineers from having a voice when considering engineering risk appetite in the dynamic shaping of early-phase conceptual design trade study outcomes. Current methods used in Collaborative Design Centers either collect risk information after...
Resource Type:: Dissertation

The Effect of Isothermal Aging on the Development of Long-Range Order in Ni-based Alloys

Creator:: Aerne, Nicholas S. J.
Abstract:: Nickel (Ni)-based alloys with a high chromium (Cr) content are frequently employed in applications where elevated temperatures and/or corrosive environments are present due to their excellent corrosion resistance and mechanical properties. However, a gap exists around the formation, and kinetics of long-range order (LRO) Ni2Cr phase in both model binary...
Resource Type:: Dissertation
Full Text:: by Nash only covered phases above 500 °C [8]. Ni-Cr-Fe phase diagram by Raynor went to only 650 °C

Search Constraints

Search Results

Limit your search