4,411 research outputs found

    Reflections on the Local and the Global in Psychology: Innovation, Liberation and Testimonio*

    Get PDF
    This paper presents some reflections on the process of creating research, from the point of view of a psychologist working in an academic environment in a developing country which is undergoing social transformation. It explores some tensions between global and local concerns in research, and reflects on the relation between research, art, narration, and the person of the researcher. The ideas presented are based on the personal reflections of the author after developing a methodology for a qualitative research project. The aim is to open up areas of inquiry into the process of constructing research, rather than providing final answers, thus honouring the postmodern assumptions that are tentatively put forward as vehicle of innovation in research in a global psychology

    NASA's Cryogenic Fluid Management Technology Project

    Get PDF
    The Cryogenic Fluid Management (CFM) Project's primary objective is to develop storage, transfer, and handling technologies for cryogens that will support the enabling of high performance cryogenic propulsion systems, lunar surface systems and economical ground operations. Such technologies can significantly reduce propellant launch mass and required on-orbit margins, reduce or even eliminate propellant tank fluid boil-off losses for long term missions, and simplify vehicle operations. This paper will present the status of the specific technologies that the CFM Project is developing. The two main areas of concentration are analysis models development and CFM hardware development. The project develops analysis tools and models based on thermodynamics, hydrodynamics, and existing flight/test data. These tools assist in the development of pressure/thermal control devices (such as the Thermodynamic Vent System (TVS), and Multi-layer insulation); with the ultimate goal being to develop a mature set of tools and models that can characterize the performance of the pressure/thermal control devices incorporated in the design of an entire CFM system with minimal cryogen loss. The project does hardware development and testing to verify our understanding of the physical principles involved, and to validate the performance of CFM components, subsystems and systems. This database provides information to anchor our analytical models. This paper describes some of the current activities of the NASA's Cryogenic Fluid Management Project

    Future NASA solar system exploration activities: A framework for international cooperation

    Get PDF
    The goals and approaches for planetary exploration as defined for the NASA Solar System Exploration Program are discussed. The evolution of the program since the formation of the Solar System Exploration Committee (SSEC) in 1980 is reviewed and the primary missions comprising the program are described

    "Phonathon: Who Gives? Who Gives More?"

    Get PDF
    Julie M. Ripper is the former Director of Annual Fund at Drake University, and can be contacted at [email protected]. Steve Krantz, Ph.D., is an Associate Professor in the School of Nursing at the University of Missouri in Kansas City. Terri Deems is an Adjunct Faculty member in the School of Education at Drake University.Because of the necessity for fundrasiers to solicit constituents in order to raise the most funds as effectively as possible, this research takes a look at the phonathon program at a Drake University, a small Midwestern University. The purpose of this study was to identify the predictors for the probability of securing a gift and the gift size in response to a call. Five core recommendations were made to improve the efficiency of the phonathon program. Future research is needed to determine whether these findings remain true over time or how these results compare to other fundraising methods

    Development of a Smooth Trajectory Maneuver Method to Accommodate the Ares I Flight Control Constraints

    Get PDF
    Six degree-of-freedom (DOF) launch vehicle trajectories are designed to follow an optimized 3-DOF reference trajectory. A vehicle has a finite amount of control power that it can allocate to performing maneuvers. Therefore, the 3-DOF trajectory must be designed to refrain from using 100% of the allowable control capability to perform maneuvers, saving control power for handling off-nominal conditions, wind gusts and other perturbations. During the Ares I trajectory analysis, two maneuvers were found to be hard for the control system to implement; a roll maneuver prior to the gravity turn and an angle of attack maneuver immediately after the J-2X engine start-up. It was decided to develop an approach for creating smooth maneuvers in the optimized reference trajectories that accounts for the thrust available from the engines. A feature of this method is that no additional angular velocity in the direction of the maneuver has been added to the vehicle after the maneuver completion. This paper discusses the equations behind these new maneuvers and their implementation into the Ares I trajectory design cycle. Also discussed is a possible extension to adjusting closed-loop guidance
    corecore