45,616 research outputs found

    Holographic microscopy reconstruction in both object and image half spaces with undistorted 3D grid

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    We propose an holographic microscopy reconstruction method, which propagates the hologram, in the object half space, in the vicinity of the object. The calibration yields reconstructions with an undistorted reconstruction grid i.e. with orthogonal xx, yy and zz axis and constant pixels pitch. The method is validated with an USAF target imaged by a ×\times60 microscope objective, whose holograms are recorded and reconstructed for different USAF locations along the longitudinal axis: -75 to +75 μ\mum. Since the reconstruction numerical phase mask, the reference phase curvature and MO form an afocal device, the reconstruction can be interpreted as occurring equivalently in the object or in image half space

    ALIGNING USAF STUDENT RESEARCH WITH STRATEGIC PRIORITIES

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    The United States Air Force (USAF) is not effectively utilizing the student research ecosystem to contribute toward USAF strategic priorities. This project researched how the USAF can enhance student research to contribute toward senior leaders’ requirements. The USAF needs to align academic research to provide solutions toward strategic competition in a resource-constrained environment. Aligning research to problems can only enhance the resulting innovation. We submitted a survey to 1,175 USAF students at civilian institutions. Of 266 responses, 83% had a deliverable requirement, 81% did not receive information about current USAF research priorities and funding opportunities, 91% would have considered incorporating USAF research priorities into their graduate research if they had received information about them, and 95% would potentially use a mobile application that gives access to prioritized USAF research questions, command sponsorships, and funding. Not aligning USAF-sponsored academic research with strategic priorities is mainly an organizational problem. First, the USAF should improve the talent management process to match students to appropriate research fields. Second, the USAF should improve education about academic resources for aligning research, finding sponsors, and securing funding. Lastly, the USAF should connect existing AFIT/CI students across the research ecosystem via a mobile application endorsed by Air Education and Training Command.Lieutenant Colonel, United States Air ForceMajor, United States Air ForceApproved for public release. Distribution is unlimited

    USAF solar thermal applications overview

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    Process heat applications were compared to solar thermal technologies. The generic process heat applications were analyzed for solar thermal technology utilization, using SERI's PROSYS/ECONOMAT model in an end use matching analysis and a separate analysis was made for solar ponds. Solar technologies appear attractive in a large number of applications. Low temperature applications at sites with high insolation and high fuel costs were found to be most attractive. No one solar thermal technology emerges as a clearly universal or preferred technology, however,, solar ponds offer a potential high payoff in a few, selected applications. It was shown that troughs and flat plate systems are cost effective in a large number of applications

    DOD (USAF) turbulence accidents and incidents

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    A summary of Air Force turbulence related mishaps for the last ten years of Air Force mishaps is presented from a perspective of where it has been, where it is now, and where it is going. In addition to accounts of major mishaps, a summary of what actions were taken to preclude future similar mishaps is presented. Also, a discussion of some of the things being done now and being planned for the future to prevent turbulence related mishaps is presented

    Ethical Issues in a Networked Environment

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    The research objective was to provide a preliminary understanding of how USAF computer users perceive the ethical considerations of computer networks and how the USAF is addressing ethical issues of networked environments. A survey was undertaken to explore questions of ethics in the use of information networks. The literature review explored issues of ethics in the private sector and USAF guidance regarding use of official government resources. The sample population consisted of military members stationed at Wright-Patterson Air Force Base Ohio. The responses regarding certain attitudes about behaviors and actions in a networked environment were consistent overall. A significant difference was observed between seven responses that addressed the issues of information privacy, unauthorized access, use of government software in the home, and personal use of government networks. Regardless of grade, age or level of command, respondents generally responded in a similar manner to different situations. The findings suggest that USAF members are aware of ethical considerations in networked environments. The results also indicate USAF management is attuned with the professional community pertaining to the guidance provided to USAF members

    Noise and aliases in off-axis and phase-shifting holography

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    We have compared the respective efficiencies of off-axis and phase-shifting holography in terms of noise and aliases removal. The comparison is made by analyzing holograms of an USAF target backlit with laser illumination, recorded with a charge-coupled device camera. We show that it is essential to remove the LO beam noise, especially at low illumination levels

    Additional Protocol I: A Military View

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    This paper is intended to analyze Additional Protocol I from a military perspective. More specifically, it presents the views of a United States military officer (albeit an officer who is also a lawyer) on the Protocol. To begin with, the Protocol, if ratified by the United States, would be taken seriously by our armed forces. It is United States policy to comply with the law of war in the conduct of military operations, and this body of law is regularly applied in American military courts. During the war in Southeast Asia, for example, 36 members of the U.S. Army were tried by courts-martial for violations of the law of war. It should be expected, then, that if the United States were to ratify the Protocol, that document would have a major impact on the conduct of the armed forces in war. It is not realistic to assume that the United States could ratify the Protocol, for whatever diplomatic and political benefits that might entail, and that its armed forces could simply ignore any inconvenient provisions of the Protocol in practice

    A Condition Based Maintenance Approach to Forecasting B-1 Aircraft Parts

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    United States Air Force (USAF) aircraft parts forecasting techniques have remained archaic despite new advancements in data analysis. This approach resulted in a 57% accuracy rate in fiscal year 2016 for USAF managed items. Those errors combine for 5.5billionworthofinventorythatcouldhavebeenspentonothercriticalspareparts.Thisresearcheffortexploresadvancementsinconditionbasedmaintenance(CBM)anditsapplicationintherealmofforecasting.ItthenevaluatestheapplicabilityofCBMforecastmethodswithincurrentUSAFdatastructures.ThisstudyfoundlargegapsindataavailabilitythatwouldbenecessaryinarobustCBMsystem.ThePhysics−BasedModelwasusedtodemonstrateaCBMlikeforecastingapproachonB−1spareparts,andforecasterrorresultswerecomparedtoUSAFstatusquotechniques.ResultsshowedthePhysics−BasedModelunderperformedUSAFmethodsoverall,howeveritoutperformedUSAFmethodswhenforecastingpartswithasmoothorlumpydemandpattern.Finally,itwasdeterminedthatthePhysics−BasedModelcouldreduceforecastingerrorby2.465.5 billion worth of inventory that could have been spent on other critical spare parts. This research effort explores advancements in condition based maintenance (CBM) and its application in the realm of forecasting. It then evaluates the applicability of CBM forecast methods within current USAF data structures. This study found large gaps in data availability that would be necessary in a robust CBM system. The Physics-Based Model was used to demonstrate a CBM like forecasting approach on B-1 spare parts, and forecast error results were compared to USAF status quo techniques. Results showed the Physics-Based Model underperformed USAF methods overall, however it outperformed USAF methods when forecasting parts with a smooth or lumpy demand pattern. Finally, it was determined that the Physics-Based Model could reduce forecasting error by 2.46% or 12.6 million worth of parts in those categories alone for the B-1 aircraft

    Antecedents of Fuel Efficiency

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    Reducing the United States Air Force (USAF)’s fuel use is a major budgetary concern, as the USAF consumes more fuel than the Army, Navy, Marine Corps and all other Department of Defense (DoD) agencies combined. This research focused on fuel efficiency of C-130 Hercules Aircraft Commanders (ACs) by proposing, constructing, and testing a survey measure of behavioral drivers of discretionary pro-environmental professional behaviors among USAF pilots

    Ground collision avoidance systems on United States Air Force aircraft

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    Thesis (S.M.)--Massachusetts Institute of Technology, Sloan School of Management, 1995.Includes bibliographical references (p. 91-92).This thesis examines a specific type of USAF aircraft mishaps - Controlled Flight Into Terrain (CFIT) mishaps. The thesis presents data on CFIT mishaps, causes, and efforts to reduce CFIT mishaps through the development and adoption of Ground Collision Avoidance Systems (GCAS) or similar designs - Ground Proximity Warning Systems (GPWS). GPWS exist today on some USAF aircraft, but many times these systems are inadequate (as evidenced by the continued occurrence of CFIT mishaps). Both ongoing and future initiatives by the USAF to adopt and develop better GPWS/GCAS systems were studied. An analysis was performed which studied the cost to the USAF (and the U.S. taxpayer) as a result of CFIT mishaps, and compared with an analysis of the cost to develop and implement improved GPWS/GCAS systems. The results show conclusively that installing GCAS/GPWS on a majority of USAF aircraft is cost effective. Technology exist today which could improve existing GPWS performance, and although efforts to improve GPWS are moving forward, some resistance does exist. Possible reasons for resistance of GCAS/GPWS adoption were studied and several recommendations were made on how to improve the adoption of these systems within the USAF.by Jan W. Scofield.S.M
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