Station-keeping guidance

The station-keeping guidance system is described, which is designed to automatically keep one orbiting vehicle within a prescribed zone fixed with respect to another orbiting vehicle. The active vehicle, i.e. the one performing the station-keeping maneuvers, is referred to as the shuttle. The other passive orbiting vehicle is denoted as the workshop. The passive vehicle is assumed to be in a low-eccentricity near-earth orbit. The primary navigation sensor considered is a gimballed tracking radar located on board the shuttle. It provides data on relative range and range rate between the two vehicles. Also measured are the shaft and trunnion axes gimbal angles. An inertial measurement unit (IMU) is provided on board the orbiter. The IMU is used at all times to provide an attitude reference for the vehicle. The IMU accelerometers are used periodically to monitor the velocity-correction burns applied to the shuttle during the station-keeping mode. The guidance system is capable of station-keeping the shuttle in any arbitrary position with respect to the workshop by periodically applying velocity-correction pulses to the shuttle

The remote sensing of aquatic macrophytes Part 1: Color-infrared aerial photography as a tool for identification and mapping of littoral vegetation. Part 2: Aerial photography as a quantitative tool for the investigation of aquatic ecosystems

Research was initiated to use aerial photography as an investigative tool in studies that are part of an intensive aquatic ecosystem research effort at Lake Wingra, Madison, Wisconsin. It is anticipated that photographic techniques would supply information about the growth and distribution of littoral macrophytes with efficiency and accuracy greater than conventional methods

New shield for gamma-ray spectrometry

Gamma-ray shield that can be evacuated, refilled with a clean gas, and pressurized for exclusion of airborne radioactive contaminants effectively lowers background noise. Under working conditions, repeated evacuation and filling procedures have not adversely affected the sensitivity and resolution of the crystal detector

Regional similarities in the distributions of well yield from crystalline rocks in Fennoscandia

Well yields from Precambrian and Palaeozoic bedrock in Norway, Sweden and Finland exhibit very similar and approximately log-normal distributions: all three data sets exhibit a median yield of 600–700 L hr-1, despite the differences in climate and lithology. This similarity is tentatively reflected on a larger geographical scale by a meta-analysis of the international data sets on crystalline rock aquifers from other recently glaciated areas (i.e., without a thick regolith of weathered rock). An heuristic treatment of the Fennoscandian data sets suggests that this median yield is consistent with the following bulk properties of shallow (to c. 70–80 m depth) crystalline bedrock: transmissivity of 0.56 ± 0.30 m2 d-1 (6.4 ± 3.4 x 10-6 m2 s-1) and hydraulic conductivity of around 1.1 (± 0.6) x 10-7 m s-1

Multiplying Apostolic Mission Movements in Cambodia and Asia: A Strategy for Equipping and Empowering Leaders through Training and Coaching

The goal of this study was to explore the current reality of the potential of the Church in Asia. This project will argue that what was once a mission field could, in this generation become one of the greatest mission forces in history. This thesis was tested in Cambodia, as over the last two decades church growth has been exponential. In recent years the ministry of Youth With A Mission in Battambang, Cambodia has trained and sent Khmer as long-term missionaries within Cambodia and to some of the most unreached nations. Through an examination of Scripture, this study identifies character traits, integrity, and leadership development as keys for raising up apostolic leaders in Asia to release mission movements. Furthermore, biblical exegesis argues that missional hubs like a modern day “Antioch” or “Ephesus” need to become strategic sending centers for the Church in Asia. To test this hypothesis a literature review of resources about mission movements was conducted that produced incredible insight into multiplying leaders, specifically in the context of Asia and with the ability to be replicated rapidly. This project concludes with ministry practice and implementation that identifies a field-tested model proven with success over recent years through pioneering teams sent out from YWAM Battambang. The new ministry project has specific goals that will create a leadership pipeline to empower and release teams to pioneer into unreached provinces in Cambodia and beyond. This project commends the larger church in Asia to partner across denominational and organizational boundaries, to join with God’s desire to see an apostolic mission movement of Asians raised up and released that will transform Cambodia and the continent of Asia and beyond in this generation

Shoulder dysfunction in intensive care survivors:an investigation into prevalence, risk factors and impact on upper limb function

Background: Limitations in function and quality of life have been reported in intensive care unit survivors for many years after hospital discharge. Shoulder dysfunction is a cause of functional limitation in other patient populations, and has been suggested as a potential cause in intensive care unit survivors. Despite this, the prevalence of shoulder dysfunction, its impact on upper limb function and risk factors for its development are unknown in intensive care unit survivors. Methods: A cohort study of intensive care unit survivors from a single general intensive care unit was undertaken using prospective and retrospective data. Participants underwent a series of shoulder assessments up to 6 months after hospital discharge to identify shoulder dysfunction and upper limb impairment. Multivariable analysis was used to investigate the risk factors for developing shoulder dysfunction. Results: Shoulder dysfunction was present in 76% of participants, with 42% presenting with ongoing shoulder dysfunction at 6 months after hospital discharge. Functional impairment of the upper limb was present in 48% of participants and severe impairment in 18%. None of the risk factors analysed were independently associated with shoulder dysfunction. Conclusions: Shoulder dysfunction is a common problem in intensive care unit survivors, and is a source of functional impairment. Further investigation addressing risk factors for its development, and therapeutic interventions to address this problem is required

Design, fabrication, and test of a composite material wind turbine rotor blade

The aerodynamic design, structural design, fabrication, and structural testing is described for a 60 foot long filament wound, fiberglass/epoxy resin matrix wind turbine rotor blade for a 125 foot diameter, 100 kW wind energy conversion system. One blade was fabricated which met all aerodynamic shape requirements and was structurally capable of operating under all specified design conditions. The feasibility of filament winding large rotor blades was demonstrated