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 31 for “"Trajectory model"”.
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A Comparative Study Between 6 Degree-of-Freedom Trajectory Model and Modified Point Mass Trajectory Model of Spinning Projectiles
… spinning projectiles, the 6 Degree-of-Freedom model can closely capture their trajectories with high accuracy and details. However, it comes with the drawbacks of long computation time and needing many aerodynamic coefficients which can be hard to obtain. The Modified Point Mass Trajectory …
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Extending the reach of drilling: better wellbore trajectory and torque & drag models
… friction forces from torque and drag [T&D] models. The novelty of the proposed models is the ability to estimate more realistic bending effects, accurately predict the contact forces between the drillstring and the wellbore, and solve T&D parameters from surface to total depth in reasonable …
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Rainfall-runoff control: variably saturated transport for an infiltration system controlling water quality and quantity
… ranging from 71 to 96 %. A 2D numerical model with Richard¡¯s equation was used to simulate the effluent hydrograph and water content profiles under transient hydraulic loadings illustrating the water quantity and water quality function of the PER. The exfiltration capacity of the …
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Soft Surface Roll Mechanics Parameters for Light Vehicle Rollover Accident Reconstruction
… rollover accidents on soft surfaces can be modeled assuming constant drag with linear motion equations and other engineering principles. The concept of using segment average results to evaluate roll mechanics parameters throughout a roll sequence, and specifically, segment duration to …
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The transformation of oscillatory equations in six degree of freedom re-entry trajectory models with coordinate transformations
… systems use a three degree of freedom (3-DOF) trajectory model. The three degrees of freedom represent the linear motion of the missile in three dimensions. A 6-DOF model adds roll, pitch, and yaw, or angular motion in three dimensions to the first three degrees of freedom. Because more of the …
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Internal energy relaxation in nitrogen plasmas
… and nitrogen atoms. The QCT (Quasi-Classical Trajectory) model recently developed at NASA Ames Research Center is used to study energy transfers and population distribution of nitrogen molecules due to collisions with atoms. An ab-initio model developed at the University College London (UCL) …
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Winter mixed-layer development in the central Irminger Sea : the effect of strong, intermittent wind events
… large-scale pressure gradients. Output from a trajectory model indicates that the air parcels entering a tip jet accelerate and descend as they are deflected around southern Greenland. A heat flux timeseries for the mooring site was constructed that includes the enhancing influence of the tip …
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Batch Continuous-Time Trajectory Estimation
… mapping (SLAM) formulation with a discrete-time trajectory model; this is not well suited for scanning-type sensors, such as lidar. In this thesis, we assert that a continuous-time model of the trajectory is a more natural and principled representation for robotic-state estimation. Practical …
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Views from the “dustbin”: a phenomenological examination of the experiences of a borderline personality disorder diagnosis as a parent
… is also examined with a proposed diagnostic trajectory model applied to this participant group.
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Examining the reciprocal associations between delinquency and parental monitoring in two adolescent samples: a within- and between-person latent variable analysis
… study uses an innovative Autoregressive Latent Trajectory Model with Structured Residual (ALT-SR) to examine the within-person (time-invariant) and between-person (time-variant) associations between delinquency and parental monitoring over a long period of time. On average, delinquency and …
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Relationship of plankton and marine snow to hydrography and currents on the south portion of Georges Bank during June 1997
… Profiler, and satellite-tracked drifters) and modeling results was performed to quantify the relationships between plankton, hydrography, and currents and the fluxes through the RLR. Temperature-salinity-plankton diagrams and factor analysis revealed that most plankton taxa had characteristic …
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An Analysis of the Differences Between Two Seasonal Saudi Arabian Dust Storms Using WRF-Chem
… (Hybrid Single Particle Lagrangian Integrated Trajectory) model to determine the dust source regions and the MERRA (Modern Era-Retrospective Analysis for Research and Applications) data for the large-scale analyses. Dust particles are generated from the Sahara Desert in the Sharav case; …
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Tracking Potential Sources of Peak Ozone Concentrations in the Arabian Gulf Region
… (Hybrid Single Particle Lagrangian Integrated Trajectory Model) back trajectories using these coordinates as a starting point were run to trace the origins of the air mass up to 3 days prior. World Wide Lightning Location Network (WWLLN) lightning data for the northern hemisphere in August and …
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The role of atmospheric aerosols on the development of the Southeast Madagascar phytoplankton bloom
… ρυθμού βροχόπτωσης, καθώς και δεδομένα μοντέλων (model reanalysis data) για το οπτικό βάθος αεροσόλ (AOD) σκόνης και μαύρου άνθρακα, και για το βάθος του αναμεμειγμένου στρώματος (MLD), με σκοπό να αξιολογηθεί ο δυνητικός ρόλος της ατμοσφαιρικής εναπόθεσης σωματιδίων πλουσίων σε σίδηρο στη θάλασσα …
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An examination of the spatially extensive heavy precipitation events over South Africa and the associated moisture trajectories
… further analysed with the use of a kinematic trajectory model. The results indicated that moisture for these events were most likely to be transported from the south Indian Ocean. Although this finding has been shown previously in other similar studies, the present investigation shows that the …
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Aircraft conflict analysis and real-time conflict probing using probabilistic trajectory modeling
… on the errors and uncertainties from the working trajectory model used to estimate future aircraft positions. The more accurate the prediction, the more likely an ideal (no false alarms, no missed detections) alerting system can be designed. Additional insights into the problem were brought forth …
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Size based separation of submicron nonmagnetic particles through magnetophoresis in structured obstacle arrays
… separations. A Lagrangian particle tracking model was developed which could describe the behavior of a nonmagnetic particle in regions of inhomogeneous magnetic field gradients. Particle trajectories were simulated for a number of obstacle array geometries and over a range of operating …
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Determinants of Nonrecovery Following Hip Fracture in Older Adults: a Chronic Disease Trajectory Analysis
… who do not fully recover. A chronic disease trajectory framework guided the theoretical design of the research. Data were collected from the medical records of 102 persons aged 60 years and older who sustained a proximal hip fracture from 1993 to 1998 at a medical center in North Carolina. …
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Relationship of plankton and marine snow to hydrography and currents on the southwest portion of Georges Bank during June 1997
… Profiler, and satellite-tracked drifters) and modeling results was performed to quantify the relationships between plankton, hydrography, and currents and the fluxes through the RLR. Temperature-salinity-plankton diagrams and factor analysis revealed that most plankton taxa had characteristic …
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