Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 37 for “"non-steady state"”.
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Non-Steady-State Catalyst Characterization with Thin-Zone TAP Experiments
… catalyst design must be advanced beyond its state-of-the-art given the significant economic and environmental relevance of catalytic technologies. To address this challenge, precise kinetic characterization of industrial catalysts is required for elucidating complex reaction mechanisms, …
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Application of the zone method of radiation analysis to simulation of the non-steady state operation of metal reheating furnaces
… method is the restriction of the simulation to steady-state conditions.<br/><br/>This Ph.D. project aims to eliminate some of these constraints and, therefore, improve application of the zone method to furnaces. Hence, full transient conditions were simulated for different zone models, which …
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Use of Cross-Correlation Analysis to Determine Heart Rate Kinetics During Non-Steady State, Fatiguing Exercise in Collegiate Female Soccer Athletes
… existed between CCFmax and CCFlag (r2=0.9989). Steady-state exercise data produced strong relationships between the calculated τ and CCFmax (r2=0.8736) and CCFlag (r2=0.9061), and CCFmax and CCFlag showed a positive relationship (r2=0.7753). CCFmax between repeated sprint trials (R2=0.9123) and …
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Characterization of natural variation in steady- and non-steady-state photosynthesis and its underlying mechanisms to improve productivity in rice (Oryza sativa)
… has come through measurements made at a steady-state. However, these measurements fail to account for the constantly fluctuating light environment that is more commonly seen in agricultural field settings where steady-state conditions seldom occur. Steady-state and non-steady-state …
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An Evaluation of Diffusion-Porosity Relationships in Soils and Other Porous Media Using Radioactive Carbon-Dioxide in a Non-Steady State Self-Diffusion System
Made available in DSpace on 2014-12-04T20:16:47Z (GMT). No. of bitstreams: 1 0013552.pdf: 6547409 bytes, checksum: 077d1b23619e2b07b047ef288d0f931b (MD5) Previous issue date: 1955
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The electrochemistry of phenothiazine derivatives
… first time on gold microdisc electrodes using steady state and non-steady state cyclic voltammetric methods. Steady-state studies The reduction of MBDs is an ECE(CC) process where the C steps are protonation reactions. The number (m) of W participating in the overall electrode process increases …
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Thermal performance testing of heat exchangers with reference to future automation
… Conventional testing requires establishing steady state conditions which is time consuming. The research considered two approaches - use of a non-steady state testing technique and closed-loop control of steady state testing. After reviewing and assessing existing non-steady state testing …
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Development of a new test protocol for the permit Ion migration test
… the chloride diffusion coefficient using the steady state diffusion test. This test is not popular due to its long test duration to achieve a steady state of flow of chlorides through the test specimen, which is used to calculate the diffusion coefficient. Therefore, applied voltage tests …
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NMR Relaxometry and Diffusometry Studies for Investigating Heterogeneous Catalysis
… within a catalyst bed were implemented under non-steady state and steady state conditions. Batch reactions were carried out to benchmark a simple aromatic hydrogenation reaction (styrene) and more complex reactions, such as aromatic nitrile hydrogenations (benzonitrile and phthalonitrile) over …
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Electrodeposition of nickel-copper alloys and nickel-copper-alumina nanocomposites into deep recesses for MEMS
… numerical models were developed to describe the steady state and non-steady state deposition processes. The effect of alumina on the metal deposition partial currents and side reactions is simulated by using a surface coverage model. Rotating cylinder experiments and simulation are used to …
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Investigating the ocean’s biological pump using thorium-235 and polonium-210
… Chapter 3 presents an unprecedentedly extensive, non-steady state study of 234Th/238U to assess POC and biogenic silica flux through NASA’s EXPORTS project. The study involved tracking an eddy for one month in the North Atlantic Ocean to quantify export over the development of a dual-phase …
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Exhumation, rift-flank uplift, and the thermal evolution of the Rwenzori Mountains determined by combined (U-Th)/He and U-Pb thermochronometry
… branch of the East African Rift, a phenomenon common throughout the East African Rift System and characteristic of continental rift systems in general. A thermochronologic study combining (U-Th)/He and U-Pb analysis of apatite, titanite, and zircon separated from crystalline basement rocks …
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The Kinetics and Thermodynamics of Oxygen in Nickel, Palladium, and Niobium-Vanadium Solid Solutions (Diffusion, Solubility, Electrochemistry)
Solid-state electrochemical measurements using alternative experimental procedures were made with the double cell Ni + NiO(VBAR)ZrO(,2) + Y(,2)O(,3)(VBAR)Ni or Pd(VBAR)ZrO(,2) + Y(,2)O(,3)(VBAR)Ni + NiO to determine the kinetic and thermodynamic functions of oxygen in solid nickel and palladium. …
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Kinetics and mechanism of alpha-chymotrypsin catalyzed reactions.
… the equilibrium constant. The same is true for non-chain reactions occuring under steady-state conditions provided that the alternative paths are equivalent as far as kinetic order is concerned. For reactions occurring under non-steady-state conditions, for chain reactions even in the steady …
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Investigation of Acceleration Dependent Nonlinear Lubricated Friction in Hydraulic Actuation Systems
… models of hydraulic actuation systems under steady state conditions and their dependency on velocity and temperature have been studied extensively over the past years. A model which is commonly employed to represent the characteristics of friction is that of Stribeck in which the dependency …
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Integration of Ruminal Volatile Fatty Acid Production Methods, Ruminal Fluid Sampling Techniques, and Mathematical Modeling
… of nutrients available for production under non-steady state conditions. In experiment 2, a device was developed which allowed time-integrated samples of ruminal fluid to be collected without repeated entry into the rumen. This method simplified the collection of ruminal fluid and produced …
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A comparative analysis of C3 and C4 photosynthesis under dynamic light conditions
… of the C4 carbon concentrating mechanism under steady state conditions are well-established, but it is less clear how the C4 pathway affects the dynamic light response. This thesis employs a comparison between phylogenetically linked C3 and C4 species across three different genera to compare C3 …
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Durability Assessment and Service Life Prediction of Concrete in Extreme Aggressive Environment
… observed between bulk conductivity and non-steady state diffusion coefficient from rapid migration tests, as well as between surface conductivity and non-steady state diffusion coefficients. Additionally, the study successfully established that the 28-day SR and BR test results can …
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Thermal stability criteria embedded in avanced control systems for batch process intensification
… The prediction of thermal stability for such nonlinear, non steady-state processes is unreliable when using most stability criteria found in literature. A new stability criterion $\mathcal{K}$ is proposed. This is derived for complex reaction networks based on the divergence criterion. …
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