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.
Results
Showing 1 to 20 of 26 for “"Time-stability"”.
-
Theoretical foundations for finite-time transient stability and sensitivity analysis of power systems
<p>Transient stability and sensitivity analysis of power systems are problems of enormous academic and practical interest. These classical problems have received renewed interest, because of the advancement in sensor technology in the form of phasor measurement units (PMUs). The advancement in …
-
Adsorptive Immobilisierung von Kollagen Typ I an Titanoxidoberflächen
… surgery show an important influence on the long time stability of the implants. Newer studies focus on the surface composition of the implants in particular the modification with biological components. Collagen is the main component of bone and is therefore an interesting substance for the base …
-
Food Security and Crises: Analyses of Disruptions in Food Systems
… pattern. Despite significant advances, each time stability seems within reach, new crises emerge to undermine progress. However, the efforts to enhance food security yield remarkable benefits, lifting millions of families from malnutrition and ensuring their daily access to sufficient and …
-
Performance analysis of assisted-GNSS receivers
… such as an accurate estimate of the GPS system time is known to improve the availability and the time-tofirst- fix performance of a GNSS receiver. However, the performance depends on the architecture of the cellular network and may vary significantly across networks. This thesis presents three …
-
Anodenkatalysatoren für PEM-Brennstoffzellen aus kolloidalen Vorstufen
… prepared via this route, exhibit a better long-time-stability in a real fuel cell setup than other catalysts. The comparison of bimetallic PtRu-catalysts with different mixed Pt- and Ru-particles, shows no differences in the CO-tolerance. By using the "surface organometallic chemistry" the …
-
Stability optimization of open-loop controlled walking robots
… method for the optimization of open-loop stability of periodic systems has been developed. This is the first time stability optimization is combined with the simultaneous solution of an optimal control problem. The problem of periodic gait generation is addressed as a subtask. Robots are …
-
Modeling and Simulation of Parallel D-STATCOMs with Full-Wave Rectifiers
… Parameters such as power loss, reaction time, stability, and THD are measured for several test scenarios. Results from this thesis show that two D-STATCOMs operating on the same point can be stable and effective under a wide range of conditions. This thesis also concludes that the …
-
Model-based guidelines for automotive electronic systems software development
… assistance, and entertainment. At the same time, stability and performance of automobiles as systems have been facing deterioration, and eventually vehicle owners are finding that features and functions become inoperative over time, causing frustration, loss of time and money. Reports of …
-
Decoupling methods for the time-dependent Navier-Stokes-Darcy interface model
… and analyzed for approximating the solution of time-dependent Navier-Stokes-Darcy (NS-Darcy) interface problems. This research on decoupling methods is motivated to efficiently solve the complex Stokes-Darcy or NS-Darcy type models, which arise from many interesting real world problems involved …
-
Propagation models for multiple-antenna systems : methodology, measurements and statistics
… spatial diversity have been implemented for some time, the emergence of Multiple-Input Multiple-Output (MIMO) communications has increased commercial interest and development in multiple-antenna technology. Given this trend it has become increasingly important that we understand the propagation …
-
Advances in Control of Uncertain Dynamical Systems with Optimal and Adaptive Approaches
… and uncertainty. Finally, it designs the finite-time controller for uncertain multiagent systems.</p> <p>It is well known that the design of the control algorithm for an uncertain dynamical system is not trivial. Motivated by this standpoint, this study focuses on optimal and adaptive control …
-
The relationship of chlorination and protein and lipid content to baking quality of soft wheat flour
… treatments involving rate and application time to alter protein content. One-half of all flour treatments were subjected to chlorination. The lipid and protein content, gliadin and glutenin composition, microstructure, rheological properties, ash, pH and color were examined. Baked angel …
-
Untersuchungen zur Entwicklung einer feldeffektbasierten Biosensoranordnung mit integriertem Referenzsystem
… (so called quasi-reference electrodes). The stability of these electrodes was investigated in 3 M KCl solution. The best results were obtained with quasi-reference electrodes prepared by means of thick-film technique. The fluctuations of the potential were less than 5 mV over 1000 hours. …
-
Untersuchungen der Strukturstabilität von Ni-(Fe)-Basislegierungen für Rotorwellen in Dampfturbinen mit Arbeitstemperaturen über 700 C
… are suitable for their fabrication, structure stability and thermo-mechanical characteristics. With view on creep and creep crack growth resistance as suitable candidates in the context a DFG research project wrought Ni-based superalloy Waspaloy and Ni-Fe-based alloy Inconel 706 were selected, …
-
Time-stable high-order finite difference methods for overset grids
… overset methods have been widely used to solve time-dependent partial differential equations, very few proofs of stability exist for them. In practice, the interface treatments for overset grids are stabilized by adding numerical dissipation without any underlying theoretical analysis, impacting …
-
The Human Faculty for Music: What's special about it?
… socio-intentional drives are afforded extended time, stability, and a degree of abstraction, intensity, focus and meaning. The author contends, therefore, that music's defining characteristics, specific functionalities and/or situated efficacies are not demarcated in broadly termed “musical” …
-
Soil moisture dynamics from satellite observations, land surface modeling, and field data
… for root zone profile and surface soil moisture time stable characteristics can be used to upper boundary for sub-surface time stability.</p><p>Through inter-comparison analysis, average soil moisture from remotely sensed measurements, ground-based measurements, and land surface model results …
-
High-Order Finite-Difference Schemes and Their Application to Computational Acoustics
… focus of this study is upon the numerical stability of high-order finite-difference schemes and their application to duct acoustics. Since acoustic waves are known to be non-dissipative and non-dispersive, high-order schemes are favored for their low dissipation and low dispersion relative …
-
Application of process analysis and optimization tools in hit-to-lead and lead optimization phases of drug discovery at EPP, NIBR
… mentioned above show how focus in lab turnaround times have been deviating attention from more impactful improvements, which can greatly affect overall drug discovery duration. Also, the analysis identifies that constant technology changes caused constant adaptation of process procedures, which …
-
On data-driven modelling and terminal sliding mode control of dynamic systems with applications
… which can only guarantee the asymptotic stability of the system, and hence, takes infinite time to reach the equilibrium. Requirements of finite-time stability can be fulfilled by adding the sliding function with a fractional nonlinear term to achieve the Terminal Sliding Mode, and using …
Page 1 of 2