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Boiling heat transfer in a water heat pipe is investigated with the objective of relating heat flux and temperature drop across the evaporator. Nucleate boiling has been postulated as the heat transfer mechanism at and near the wall. A correlation has been obtained that relates evaporator heat flux and temperature drop to various screen-wick and working fluid properties. It is shown to agree well with other available experimental data.

Our heat spreaders would not change the frontal area of the engine and should have a negligible impact on the installed weight of the propulsion assembly. We expect our approach could lead to a very significant reduction in thermal stress-induced warping which is primarily responsible for wear and high friction.

Integrated power and thermal modeling necessitates dynamic simulations of liquid, air, and two-phase fluids within vapor cycle system components, air cycle machine and propulsion components, hydraulic components, and more while heat generation of many on-board electrical components must also be precisely calculated as well.

A method that exploits certain properties of a recirculating gas has been investigated as a means of achieving a sustained accelerative vector force without either the expulsion of mass from or a reaction against an external mass by the accelerated body. A theory of operation is presented that defines the capabilities and limitations of the method, and which has resulted in functioning prototypes. The prototype devices require only a source of electric power and a means of cooling to achieve an internally generated, externally measurable accelerative vector force that is sustained for as long as power is supplied to the device.

On Sept. 12, NASA will conduct the first test flight of its latest heatshield, the Adaptable Deployable Entry Placement Technology (ADEPT) mechanically deployable semi-rigid aeroshell entry system.

This SAE Aerospace Recommended Practice (ARP) provides performance station designation and nomenclature systems for aircraft propulsion systems and their derivatives.

A description is presented on how to perform fundamental analyses for accumulators used to maintain pressure control in closed-loop fluid systems. This includes how to charge the loop to meet pump net positive suction pressure (NPSP), accommodate leakage and ground fill uncertainties, and maximize operating and nonoperating pressures. Additionally, the no-fault propagation requirement must be satisfied such that a failure of one accumulator will not fail another. A SINDA/FLUINT model of the early external active thermal control system (EEATCS) was developed. The EEATCS is used to perform the cooling of the United States (U.S.) Laboratory (USL) during early assembly stages of the International Space Station (ISS) to support assured early research. The EEATCS provides the ability to transport the thermal load generated by the USL to space by thermal radiation via two deployable radiators.

This paper identifies critical and relevant variable/adaptive cycle turbine engine and propulsion subsystem technologies for future next generation aviation systems. A comprehensive evaluation of key technology drivers associated with the development and demonstration of advanced Adaptive Power and Thermal Management System (APTMS) technologies applicable to next generation platforms is addressed.

Seeing the Light Achieving Full-Color, Day or Night Readability for Flat-Panel Displays Multiple Node Networking Using PCIe Interconnects PCI Express (PCIe) interconnects, and how they can be used to support multiple node low latency data transfers over copper or optical cables, is gaining momentum in embedded computing solutions. Zero-Emissions Electric Aircraft Theory vs Reality Analyzing Radar Signals With Demodulation Combining Software and Hardware for Highly Specialized Multichannel Spectrum Monitoring Advanced Thermal Management Solutions Thermoelectric Cooling Thermal Ground Planes Thermal Management of Laser Diodes The Effect of Substrate Emissivity on the Spectral Emission of a Hot-Gas Overlayer Process Approach to Determining Quality Inspection Deployment Experimental Setup to Assess Blast and Penetration-Induced Secondary Debris in a Military Operations in Urban Terrain (MOUT) Environment Non-Contact Circuit for Real-Time Electric and Magnetic Field Measurements

Empowering Soldiers Through ISPDS Dispensable Gels vs Gap Filler Pads An Analysis of Thermal Management Materials Electronic Warfare Vying for Control of the Electromagnetic Spectrum More Bang for the Buck A New Design and Manufacturing Method for Deep Penetrating Bomb Cases A Comprehensive Way to Use Bonding to Improve RF Performance of Low Noise Amplifiers Army and Universities Deploy New Warfighter Communication Technology Radiation Effects on Electronics in Aligned Carbon Nanotube Technology (RadCNT) Characterizing the fundamental mechanisms and charge transport phenomena governing the interactions between ionizing and non-ionizing radiation with carbon-based (nanotube and graphene) field-effect transistors (FETs) devices and integrated circuits (ICs).

Interoperability Standards Pave the Way for Modular Robotic Manipulators Solar Powering UAVs Deploying COTS Subsystems in UUVs Developing a Multi-Modal UGV Robot Control Interface Fast-Tracking Autonomous Vehicles with Simulation Gesture-Based Controls for Robots: Overview and Implications for Use by Soldiers Identifying the Flow Physics and Modeling Transient Forces on Two-Dimensional Wings Experimental Confirmation of an Aquatic Swimming Motion Theoretically of Very Low Drag and High Efficiency The Scaling of Loss Pathways and Heat Transfer in Small Scale Internal Combustion Engines A Guide for Developing Human-Robot Interaction Experiments in the Robotic Interactive Visualization and Experimentation Technology (RIVET) Simulation

Modern propulsion system designers face challenges that require that aircraft and engine manufacturers improve performance as well as reduce the life-cycle cost (LCC). ...These improvements will require a more efficient, more reliable, and more advanced propulsion system. The concept of smart components is built around actively controlling the engine and the aircraft to operate optimally. ...This process involves defining, developing, and validating against requirements for key integrated propulsion, power, and thermal management system capabilities.

This SAE Aerospace Standard (AS) provides a performance station designation system for aircraft propulsion systems and their derivatives. The station numbering conventions presented herein are for use in all communications concerning propulsion system performance such as computer programs, data reduction, design activities, and published documents. ...The station numbering conventions presented herein are for use in all communications concerning propulsion system performance such as computer programs, data reduction, design activities, and published documents. ...Numbering conventions for instrumentation used in testing aircraft propulsion systems are not explicitly addressed in AS755. Other industry resources, such as ARP246, AIR1419, and AGARD-AR-245, provide recommendations and guidance based on AS755 station numbering and AS6502 nomenclature principles.

This SAE Aerospace Standard (AS) provides a performance station designation system for aircraft propulsion systems and their derivatives.

This SAE Aerospace Standard (AS) provides performance station designation and nomenclature systems for aircraft propulsion systems and their derivatives.

This SAE Aerospace Standard (AS) provides performance station designation and nomenclature systems for aircraft propulsion systems and their derivatives.

This SAE Aerospace Recommended Practice (ARP) provides performance station designation and nomenclature systems for aircraft propulsion systems and their derivatives.

Separate procurements for air vehicle, propulsion system, and avionics have contributed to the development of aircraft that are sub-optimized from a thermal management viewpoint. ...Thermal integration between the air vehicle, propulsion system, and avionics can be particularly important from a thermal management standpoint.

This procurement specification covers aircraft-quality bolts and screws made from 6Al - 4V titanium alloy of the type identified under the Unified Numbering System as UNS R56400. The following specification designation and its properties are covered:

This procurement specification covers aircraft-quality bolts and screws made of 6Al - 4V titanium alloy of the type identified under the Unified Numbering System as UNS R56400. The following specification designation and its properties are covered.