• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 533
  • 356
  • 112
  • 70
  • 32
  • 19
  • 11
  • 9
  • 8
  • 5
  • 4
  • 4
  • 4
  • 4
  • 3
  • Tagged with
  • 1384
  • 224
  • 209
  • 204
  • 189
  • 141
  • 139
  • 116
  • 108
  • 99
  • 92
  • 87
  • 84
  • 79
  • 76
  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Three-dimensional trajectory optimization in constrained airspace

Dai, Ran. Cochran, John E. January 2007 (has links) (PDF)
Dissertation (Ph.D.)--Auburn University, 2007. / Abstract. Vita. Includes bibliographic references.
2

Topology optimization with simultaneous analysis and design /

Sankaranarayanan, S., January 1992 (has links)
Thesis (Ph. D.)--Virginia Polytechnic Institute and State University, 1992. / Vita. Abstract. Includes bibliographical references (leaves 74-80). Also available via the Internet.
3

Optimal trajectory generation with DMOC versus NTG : application to an underwater glider and a JPL aerobot /

Zhang, Weizhong. January 2009 (has links) (PDF)
Thesis (Ph. D.)--University of Louisville, 2009. / Department of Electrical and Computer Engineering. Vita. "December 2009." Includes bibliographical references (leaves 108-114).
4

Group Trajectory Analysis in Sport Videos

Duraivelan, Shreenivasan 18 May 2021 (has links)
No description available.
5

TRADAT VI Telemetry Ranging System

Bertenshaw, Thomas G. 10 1900 (has links)
International Telemetering Conference Proceedings / October 25-28, 1993 / Riviera Hotel and Convention Center, Las Vegas, Nevada / Frequently a requirement exists to track sounding rockets or balloons from remote locations which have no radar capability. Occasionally, there is also a requirement to provide an alternative to radar tracking at those locations where it exists. TRADAT VI satisfies both requirements by providing vehicle positional from telemetry. In addition, it also provides real-time trajectory plots by its graphical display.
6

Foolproof completions for high rate production wells

Tosic, Slavko 15 May 2009 (has links)
Operators, especially those managing production from deepwater reservoirs, are striving to produce hydrocarbons at higher and higher rates without exposing the wells to completion failure risk. To avoid screen failures, recent studies have favored gravel pack (GP) and high rate water pack (HRWP) completions over high-permeability fracturing (HPF), known in the vernacular as a frac&pack (FP) for very high rate wells. While a properly designed GP completion may prevent sand production, it does not stop formation fines migration, and, over time, fines accumulation in the GP will lead to increasing completion skin. Although, and not always, the skin can be removed by acidizing, it is not practical to perform repeated acid treatments on deepwater wells, particularly those with subsea wellheads, and the alternative has been to subject the completion to increasingly high drawdown, accepting a high skin effect. A far better solution is to use a HPF completion. Of course the execution of a successful HPF is not a trivial exercise, and frequently, there is a steep learning curve for such a practice. This work explains the importance to HPF completions of the well trajectory through the interval to be hydraulically fractured, for production, not execution, reasons. A new model quantifies the effect of the well inclination on the connectivity between the fracture and the well via perforations. Guidelines based on the maximum target production rate, including forecasts of multiphase flow, are provided to size the HPF completion to avoid common completion failures that may result from high fluid rate and/or fines movement. Skin model will be developed for both vertical and deviated wells. Once the HPF is properly designed and executed, the operators should end up with a long term low skin good completion quality well. The well will be safely produced at the maximum flow rates, with no need for well surveillance and monitoring.
7

Foolproof completions for high rate production wells

Tosic, Slavko 10 October 2008 (has links)
Operators, especially those managing production from deepwater reservoirs, are striving to produce hydrocarbons at higher and higher rates without exposing the wells to completion failure risk. To avoid screen failures, recent studies have favored gravel pack (GP) and high rate water pack (HRWP) completions over high-permeability fracturing (HPF), known in the vernacular as a frac&pack (FP) for very high rate wells. While a properly designed GP completion may prevent sand production, it does not stop formation fines migration, and, over time, fines accumulation in the GP will lead to increasing completion skin. Although, and not always, the skin can be removed by acidizing, it is not practical to perform repeated acid treatments on deepwater wells, particularly those with subsea wellheads, and the alternative has been to subject the completion to increasingly high drawdown, accepting a high skin effect. A far better solution is to use a HPF completion. Of course the execution of a successful HPF is not a trivial exercise, and frequently, there is a steep learning curve for such a practice. This work explains the importance to HPF completions of the well trajectory through the interval to be hydraulically fractured, for production, not execution, reasons. A new model quantifies the effect of the well inclination on the connectivity between the fracture and the well via perforations. Guidelines based on the maximum target production rate, including forecasts of multiphase flow, are provided to size the HPF completion to avoid common completion failures that may result from high fluid rate and/or fines movement. Skin model will be developed for both vertical and deviated wells. Once the HPF is properly designed and executed, the operators should end up with a long term low skin good completion quality well. The well will be safely produced at the maximum flow rates, with no need for well surveillance and monitoring.
8

Application of automatic differentiation to trajectory optimization via direct multiple shooting

Garza, David Marcelo. January 2003 (has links) (PDF)
Thesis (Ph. D.)--University of Texas at Austin, 2003. / Vita. Includes bibliographical references. Available also from UMI Company.
9

TRANSFORMATIONS AND DISCONTINUITIES FOR OPTIMAL SPACE TRAJECTORIES

Mason, Joseph D. January 1968 (has links)
No description available.
10

Dielectrophoresis in surface fouling prevention

Chakraborty, Tathagata Unknown Date
No description available.

Page generated in 0.068 seconds