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 147 for “"time lag"”.
-
Optimal Control of Linear Systems With Time Lag
Made available in DSpace on 2014-12-08T22:23:49Z (GMT). No. of bitstreams: 1 6511839.pdf: 1003966 bytes, checksum: 32bda55a6989341c8bfe9a189f68050e (MD5) Previous issue date: 1965
-
Resonance Compensation of Large AC Drivetrains with Significant Time Lag
… tend to fall apart with large values of time lag. We investigate a modified LQR/LQE approach using a torque sensor as the feedback element. The result is a low order SISO filter that suppresses the effects of the torque ripple on the underdamped plant.
-
Time-Lag in a Nonlinear Feedback System With a Time-Varying Parameter
Made available in DSpace on 2014-12-04T21:03:29Z (GMT). No. of bitstreams: 1 6202982.pdf: 3864258 bytes, checksum: 393fac0a3cda813ebaeeea20df8e3338 (MD5) Previous issue date: 1962
-
Entrainment of Sediment by Unsteady Turbulent Flows
… moderately unsteady flows. For unsteady flows a time lag is observed between the shear velocity and the entrainment. The time lag is larger for flows with lower Reynolds numbers since turbulence plays an important role in the entrainment process. Experiments conducted with fine sediment had lower …
-
Quantitative and Qualitative Error Re-analysis of Tidal Datasets
… was identified using a method that quantifies time lag as a linear regression of height difference between a predicted and measured tidal height and the predicted rate of change of tidal height. Errors identified through this method were validated by visual inspection of qualitative records and …
-
Spectral Variability Analysis of BL Lacertae
… the intranight color variations on short timescales using the method of Color-Magnitude Diagram analysis and to look for the time-lag between the variations at different optical wavelengths using the method of Discrete Correlation Function analysis. Quasi-simultaneous measurements in the …
-
Estimating partial group delay
… is a spectral parameter, which measures the time lag between two time series in a system after the spurious effects of the other series in the system have been eliminated. For weakly-stationary processes, estimators for partial group delay are proposed based on indirect and direct approaches. …
-
An observational study of freeway lane-changing behaviour
… neighboring faster lane, usually after a certain time-lag. This time-lag depends on the dynamic characteristics of the vehicle, the availability of acceptable gaps, and the driver risk, which is the value the driver places on the probability of collision during a maneuver, i.e. the higher the …
-
Inference and Estimation in Change Point Models for Censored Data
… of a change in distribution for a set of time-ordered observations. This has applications in a large variety of fields and can also apply to survival data. With improvements to medical diagnoses and treatments, incidences and mortality rates have changed. However, the most commonly used …
-
Mathematical Models of Biochemical Oscillations
… of introducing both distributed and discrete time delay into Goodwin's model. We will show that the presence of distributed time lag modifies Goodwin's model in no significant way. The final section of the paper will discuss discrete time lag in the context of a minimal model of the circadian …
-
An Experimental Investigation of the Effects of Price Promotions on Brand Attitudes: An Attribution Theory Perspective
… that brand attitudes improved after a one week time lag, suggesting that if there are negative effects as a consequence of the brand's promotional activity, the negative effects dissipate within a one week time period (so long as the promotional activity does not continue).
-
Essays on testing spatial models
… thesis mainly develops robust Rao’s score tests (Lagrange multiplier (LM) tests) for different types of spatial models. The models studied in this thesis include a spatial dynamic panel data (SDPD) model and a nonlinear SAR (NSAR) model. The proposed test is aiming to solve model selection …
-
Prediction of departure from nucleate boiling in PWR fast power transients
… DNB, thus applying a steady-state correlation to time-dependent cases. However, according to the transient DNB model used in this work, a time lag exists between DNB as predicted by steady-state correlations, and effective transient DNB. During that time lag, the liquid film between the wall and …
-
Unsteady Skin-Friction Measurements on a Maneuvering Darpa2 Suboff Model
… region of the sail-on-side case show significant time lags between unsteady and steady crossflow separation locations. These effects produce the difference in separation topology between the unsteady and steady flowfields. A first-order time lag model approximates the unsteady separation locations …
-
A Study of Perspectives of Educators Across Clinical and Scholarly/scientific Work Settings
… in teacher education of (1) the 20 to 50-year time lag in the implementation of research findings in the field, (2) the qualified survival of innovation projects in applied settings, and (3) the typical dissatisfaction of teachers with their training. Terming the problem a "communication gap" …
-
Information fusion for an unmanned underwater vehicle through probabilistic prediction and optimal matching
… effectively at different depths, there is a time lag between AIS and sonar data collection. A recurrent neural network predicts a contact's future occupancy grid from a segment of its AIS track. Assignment costs are formed by comparing a sonar position with the predicted occupancy grids of …
-
Combustion Instability Mechanism of a Reacting Jet in Cross Flow at Gas Turbine Operating Conditions
… flow impedance as well as an overall jet flame time lag. The jet impedance is simply a function of the acoustic properties of the geometry while the flame time lag can be separated into jet velocity, equivalence ratio, and strain fluctuations, depending on the operating conditions and setup. For …
-
Effects of Glaciation on Volcanism in Iceland
… the glaciation and deglaciation are developed. A time-lag sampler is incorporated to represent the time lag between the melt production at depths and the eruption on the Earth's surface due to finite rate of melt transport. The model results for the last deglaciation in Iceland show that the …
-
Phenology Effects on Carbon and Water Dynamics in a Pristine Boreal Fen A multi-decadal analysis from 2005-2007 & 2014-2022
… and correlation-analysis, commonality analysis, time lag testing, stepwise multiple-regression, and structural equation modelling). Significant trends were found for LAI (increasing) and WT (decreasing), suggesting ongoing changes in the ecosystem (climate change signal). Within this system LAI …
-
Orphan Drugs: Designations, Approvals, and Prices in the US
… approvals and the factors associated with the time lag between orphan designation and approval in the US from 1983 to 2021. It also evaluated the treatment cost of orphan and non-orphan drugs and factors explaining the treatment cost of new drugs approved by the FDA from 2017 to 2021.</p> …
Page 1 of 8