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	Multidisciplinary Design, Analysis, and Optimization Branch		TOP STORIES Distributed Turboelectric Propulsion for Hybrid Wing Body Aircraft Ultrahigh Bypass Ratio Propulsion Systems Studied P-BEAT: A Process-Based Economic Analysis Tool An Environmental Design Space to Assess Aircraft Technology and Operational Trades Adaptive Engine Technologies for Aviation CO2 Emissions Reduction Risk Assessment and Technology Portfolio Prioritization Using Logic-Evolved Decision Analysis Methodologies for Aviation Security Analytical Core Noise Model Improved for Modern Turbofan Engines Water Injection in Commercial Aircraft Investigated for Increasing Engine Life and Reducing Costs and Emissions Tiny Engines, Big Rewards: A Cruise-Efficient, Short Takeoff & Landing Vehicle is Analyzed MDAO Branch's Participation in the 42nd Joint Propulsion Conference Performance of a Fuel-Cell-Powered, Small Electric Airplane Assessed Computer Code for Gas Turbine Engine Weight and Disk Life Estimation Improved NPSS Team Wins Prestigious NASA Software of the Year Award Advanced Engine Cycles Analyzed for Turbofans With Variable-Area Fan Nozzles Actuated by a Shape Memory Alloy Noise Reduction Benefits Analyzed for Over-the-Wing-Mounted Advanced Turbofan Engines Minimum Climb to Cruise Noise Trajectories Modeled for the High Speed Civil Transport
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