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  • thema EDItEUR::J Society and Social Sciences::JP Politics and government::JPS International relations  (7)
  • Aerodynamics  (4)
  • Spacecraft Design, Testing and Performance  (4)
  • 1
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    Victory Has a Thousand Fathers (2023)
    RAND Corporation
    Details
    Publication Date: 2024-03-29
    Description: A collection of the 30 most recent resolved insurgencies, covering the period 1978 to 2008, along with a bank of 76 factors that helped or hindered the COIN force in each case and in each phase of each case, supplements an analysis of historical and contemporary insurgencies, providing valuable lessons for U.S. engagement in and support for COIN operations.
    Keywords: Political Science ; Sociology ; thema EDItEUR::J Society and Social Sciences::JP Politics and government::JPS International relations ; thema EDItEUR::J Society and Social Sciences::JW Warfare and defence ; thema EDItEUR::G Reference, Information and Interdisciplinary subjects::GT Interdisciplinary studies::GTP Development studies
    Language: English
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  • 2
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    Paths to Victory (2023)
    RAND Corporation
    Details
    Publication Date: 2024-04-04
    Description: Building on a 2010 RAND study of the 30 insurgencies begun and completed between 1978 and 2008, this study added 41 new cases to the data set, allowing comparisons across all 71 insurgencies begun and completed worldwide since World War II to distill the paths to victory. With many more cases to compare, the study was able to more rigorously test the previous findings and address several critical questions that the earlier study could not.
    Keywords: Political Science ; History ; thema EDItEUR::N History and Archaeology::NH History::NHW Military history ; thema EDItEUR::J Society and Social Sciences::JP Politics and government::JPS International relations ; thema EDItEUR::J Society and Social Sciences::JW Warfare and defence
    Language: English
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  • 3
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    Victory Has a Thousand Fathers (2023)
    RAND Corporation
    Details
    Publication Date: 2024-03-29
    Description: Insurgency is the most prevalent form of armed conflict and the subject of countless studies, yet the U.S. military has only recently begun to review doctrine and training in this area. An examination of approaches to counterinsurgency from 30 recent resolved campaigns reveals, for example, that good COIN practices tend to "run in packs" and that the balance of selected good and bad practices perfectly predicts the outcome of a conflict.
    Keywords: Political Science ; Sociology ; thema EDItEUR::J Society and Social Sciences::JP Politics and government::JPS International relations ; thema EDItEUR::J Society and Social Sciences::JW Warfare and defence ; thema EDItEUR::G Reference, Information and Interdisciplinary subjects::GT Interdisciplinary studies::GTP Development studies
    Language: English
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  • 4
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    Mexico Is Not Colombia (2023)
    RAND Corporation
    Details
    Publication Date: 2024-03-29
    Description: Despite the scope of the threat they pose to Mexico’s security, violent drug-trafficking organizations are not well understood, and optimal strategies to combat them have not been identified. While there is no perfectly analogous case from history, Mexico stands to benefit from historical lessons and efforts that were correlated with improvement in countries facing similar challenges related to violence and corruption.
    Keywords: Sociology ; Psychology ; Political Science ; thema EDItEUR::J Society and Social Sciences::JP Politics and government::JPS International relations ; thema EDItEUR::M Medicine and Nursing::MK Medical specialties, branches of medicine::MKZ Therapy and therapeutics::MKZR Addiction and therapy ; thema EDItEUR::J Society and Social Sciences::JK Social services and welfare, criminology::JKV Crime and criminology
    Language: English
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  • 5
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    Paths to Victory (2023)
    RAND Corporation
    Details
    Publication Date: 2024-04-04
    Description: In-depth case studies of 41 insurgencies since World War II break each conflict into phases and examine the trajectory that led to the outcome (insurgent win or counterinsurgent win). Detailed analysis of the findings, including those from an original set of 30 insurgencies (for a total of 71 historical cases), is available in the companion volume, Paths to Victory: Lessons from Modern Insurgencies.
    Keywords: Political Science ; History ; thema EDItEUR::N History and Archaeology::NH History::NHW Military history ; thema EDItEUR::J Society and Social Sciences::JP Politics and government::JPS International relations ; thema EDItEUR::J Society and Social Sciences::JW Warfare and defence
    Language: English
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  • 6
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    Counterinsurgency Scorecard (2023)
    RAND Corporation
    Details
    Publication Date: 2024-04-14
    Description: A key finding of previous RAND research on insurgencies worldwide since World War II was that an overall score on a scorecard of 15 equally weighted good and 11 equally weighted bad counterinsurgency factors and practices perfectly discriminated conflicts’ historical outcomes. Using the scorecard approach and an expert elicitation (Delphi) exercise, a RAND study sought to extend the findings to the case of Afghanistan in early 2013.
    Keywords: Technology ; Political Science ; thema EDItEUR::U Computing and Information Technology::UN Databases::UNA Database design and theory ; thema EDItEUR::J Society and Social Sciences::JP Politics and government::JPS International relations ; thema EDItEUR::J Society and Social Sciences::JW Warfare and defence
    Language: English
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  • 7
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    Mexico Is Not Colombia (2023)
    RAND Corporation
    Details
    Publication Date: 2024-03-29
    Description: Despite the scope of the threat they pose to Mexico’s security, violent drug-trafficking organizations are not well understood, and optimal strategies to combat them have not been identified. While there is no perfectly analogous case to Mexico’s current security situation, historical case studies may offer lessons for policymakers as they cope with challenges related to violence and corruption in that country.
    Keywords: Sociology ; Psychology ; Political Science ; thema EDItEUR::J Society and Social Sciences::JP Politics and government::JPS International relations ; thema EDItEUR::M Medicine and Nursing::MK Medical specialties, branches of medicine::MKZ Therapy and therapeutics::MKZR Addiction and therapy ; thema EDItEUR::J Society and Social Sciences::JK Social services and welfare, criminology::JKV Crime and criminology
    Language: English
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  • 8
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    Aerodynamic Limitations of the UH-60A Rotor (1996)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: High quality airloads data have been obtained on an instrumented UH-60A in flight and these data provide insight into the aerodynamic limiting behavior of the rotor. At moderate weight coefficients and high advance ratio limiting performance is largely caused by high drag near the blade tip on the advancing side of the rotor as supercritical flow develops on the rotor with moderate to strong, shocks on both surfaces of the blade. Drag divergence data from two-dimensional airfoil tests show good agreement with the development of the supercritical flow regions. Large aerodynamic pitching moments are observed at high advance ratio, as well, and these pitching moments are the source of high torsional moments on the blade and control system loads. These loads occur on the advancing side of the disk and are not related to blade stall which does not occur for these weight coefficients. At high weight coefficients aerodynamic and structural limits are related to dynamic stall cycles that begin on the retreating side of the blade and, for the most severe conditions, carry around to the advancing side of the blade at the presumed first frequency of the blade/control system.
    Keywords: Aerodynamics
    Type: NASA-TM-110396 , A-961611 , NAS 1.15:110396 , USAATCOM-TR-96-A-011
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    NASA TECHNICAL REPORTS
  • 9
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    Boundary Layer Transition in the Leading Edge Region of a Swept Cylinder in High Speed Flow (1998)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Experiments were conducted on a 76 degree swept cylinder to establish the behavior of the attachment line transition process in a low-disturbance level, Mach number 1.6 flow. For a near adiabatic wall condition, the attachment-line boundary layer remained laminar up to the highest attainable Reynolds number. The attachment-line boundary layer transition under the influence of trip wires depended on wind tunnel disturbance level, and a transition onset condition for this flow is established. Internal heating raised the surface temperature of the attachment line to induce boundary layer instabilities. This was demonstrated experimentally for the first time and the frequencies of the most amplified disturbances were determined over a range of temperature settings. Results were in excellent agreement to those predicted by a linear stability code, and provide the first experimental verification of theory. Transition onset along the heated attachment line at an R-bar of 800 under quiet tunnel conditions was found to correlate with an N factor of 13.2. Increased tunnel disturbance levels caused the transition onset to occur at lower cylinder surface temperatures and was found to correlate with an approximate N factor of 1 1.9, so demonstrating that the attachment-line boundary layer is receptive to increases in the tunnel disturbance level.
    Keywords: Aerodynamics
    Type: NASA/TM-1998-112224 , A-98-09981 , NAS 1.15:112224
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    NASA TECHNICAL REPORTS
  • 10
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    A Survey of Theoretical and Experimental Coaxial Rotor Aerodynamic Research (1997)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The recent appearance of the Kamov Ka-50 helicopter and the application of coaxial rotors to unmanned aerial vehicles have renewed international interest in the coaxial rotor configuration. This report addresses the aerodynamic issues peculiar to coaxial rotors by surveying American, Russian, Japanese, British, and German research. (Herein, 'coaxial rotors' refers to helicopter, not propeller, rotors. The intermeshing rotor system was not investigated.) Issues addressed are separation distance, load sharing between rotors, wake structure, solidity effects, swirl recovery, and the effects of having no tail rotor. A general summary of the coaxial rotor configuration explores the configuration's advantages and applications.
    Keywords: Aerodynamics
    Type: NASA-TP-3675 , NAS 1.60:3675 , A-975555
    Format: application/pdf
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