Numerical Model of a Variable-Combined-Cycle Engine for Dual Subsonic and Supersonic Cruise

Efficient high speed propulsion requires exploiting the cooling capability of the cryogenic fuel in the propulsion cycle. This paper presents the numerical model of a combined cycle engine while in air turbo-rocket configuration. Specific models of the various heat exchanger modules and the turbomachinery elements were developed to represent the physical behavior at off-design operation. The dynamic nature of the model allows the introduction of the engine control logic that limits the operation of certain subcomponents and extends the overall engine operational envelope. The specific impulse and uninstalled thrust are detailed while flying a determined trajectory between Mach 2.5 and 5 for varying throttling levels throughout the operational envelope

Meat Your Enemy: Animal Rights, Alignment, and Radical Change

Radical change can be conceived in terms of the reconceiving of ontological distinctions, such as those separating humans from animals. In building on insights from French pragmatism, we suggest that, while no doubt very difficult, radical change can potentially be achieved by creating “alignment” between multiple “economies of worth” or “common worlds” (e.g., the market world of money, the industrial world of efficiency). Using recent campaigns by animal rights organizations as our case, we show how the design of “tests” (e.g., tests of profitability, tests of efficiency) can help align multiple common worlds in support for radical change. Our analysis contributes to the broader management and organization studies literatures by conceiving radical change in terms of changing ontological categorizations (e.g., human/animals vs. sentient/ non-sentient), and by proposing that radical social change agents can be helpfully conceived as opportunistically using events to cumulatively justify the change they desire overtime