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  • 1
    Publication Date: 2024-04-02
    Description: Using primary sources and interviews with those involved in the fighting and its aftermath, the authors describe the 2008 Battle of Sadr City, analyze its outcome, and derive implications for the conduct of land operations. Their analysis identifies factors critical to the coalition victory over Jaish al-Mahdi and describes a new model for dealing with insurgent control of urban areas.
    Keywords: History ; thema EDItEUR::N History and Archaeology::NH History::NHG Middle Eastern history ; thema EDItEUR::N History and Archaeology::NH History::NHW Military history
    Language: English
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  • 2
    Publication Date: 2023-10-05
    Description: In this report, RAND researchers assess the potential future production levels, production costs, greenhouse gases, and other environmental implications of synthetic crude oil from oil sands and fuels produced via coal liquefaction relative to conventional petroleum-based transportation fuels. The findings indicate the potential cost-competitiveness of these alternative fuels and potential economic-environmental trade-offs from their deployment.
    Keywords: Political Science ; Environmental Science ; Technology ; bic Book Industry Communication::R Earth sciences, geography, environment, planning::RN The environment::RND Environmental policy & protocols ; bic Book Industry Communication::T Technology, engineering, agriculture::TB Technology: general issues
    Language: English
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  • 3
    Publication Date: 2024-03-29
    Description: U.S. Army Special Operations Command sought options for enhancing the contributions of the Special Forces Groups of the U.S. Army National Guard (ARNG). The research was motivated by the sponsor’s belief that ARNG might occupy high-value capability niches that could be put to use in future deployments. This study analyzed ARNG Special Forces capabilities as well as the legal and policy guidance that governs ARNG’s functioning.
    Keywords: Technology ; History ; thema EDItEUR::J Society and Social Sciences::JW Warfare and defence::JWK Military and defence strategy ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TT Other technologies and applied sciences::TTM Military engineering
    Language: English
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  • 4
    Publication Date: 2024-04-02
    Description: In 2008, U.S. and Iraqi forces defeated an uprising in Sadr City, a district of Baghdad with ~2.4 million residents. Coalition forces’ success in this battle helped consolidate the Government of Iraq’s authority, contributing significantly to the attainment of contemporary U.S. operational objectives in Iraq. U.S. forces’ conduct of the battle illustrates a new paradigm for urban combat and indicates capabilities the Army will need in the future.
    Keywords: Technology ; History ; thema EDItEUR::N History and Archaeology::NH History::NHG Middle Eastern history ; thema EDItEUR::J Society and Social Sciences::JW Warfare and defence::JWK Military and defence strategy ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TT Other technologies and applied sciences::TTM Military engineering
    Language: English
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  • 5
    Publication Date: 2019-07-20
    Description: The purpose of this study was to determine whether High Cycle Fatigue (HCF) loading has any deleterious synergistic effect on life when combined with the typical Low Cycle Fatigue (LCF) loading present in engine disks. This interaction is particularly important in the rim region of blisk applications, where fatigue initiations from vibratory stresses (HCF) may be propagated to the disk by LCF. The primary effort in this study was focused on determining and documenting initiation sites and damage mechanisms. Under LCF loading conditions the failures were predominantly surface initiated, while HCF loading favored internal initiations. Deleterious HCF/LCF interactions would always result in a transition from internal to surface initiations. The results indicated that under the relative stress conditions evaluated there was no interaction between HCF and LCF. In FY99 this effort was extended to investigate several other loading conditions (R-ratio effects) as well as interactions between LCF and two-hour tensile dwells. The results will be published as a NASA Technical Memorandum.
    Keywords: Metals and Metallic Materials
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