Experiment Pointing Subsystems (EPS) requirements for Spacelab missions

The goal of the experiment pointing subsystems (EPS) is to accommodate a broad spectrum of instrument types by providing a number of stability and control functions that greatly exceed the capability of the shuttle. These functions include target acquisition, target tracking through wide gimbal ranges, stabilization, simultaneous pointing to one or more targets, instrument rastering, and on-orbit calibration. The experiments will vary widely in size, weight, geometry, and instrument types, and many have not been completely defined. This great diversity of requirements reflects the long term plans of the user community and establishes challenging performance requirements for the EPS

An assessment of the Instrument Pointing Subsystems (IPS) requirements for spacelab missions

Instrument Pointing Subsystem requirements for Spacelab missions in solar physics, stellar astronomy, and earth observation are analyzed and design guidelines for fine pointing instrument platforms are presented. The requirements for the platforms are time-phased based on NASA projections of flight mission models and payload scheduling. The experiments used for these projections are to be viewed as representative payloads. Other experiments or experiment groupings within any one discipline may be accommodated by an Instrument Pointing Subsystem that meets these requirements

Device damps fluid pressure oscillations in vent valve

Device, containing a tuned series arrangement of two plenum chambers and two orifices, damps high pressure fluid oscillations in a vent valve. Used in conjunction with vent valves, it relieves gas pressure that develops in liquid hydrogen and liquid oxygen tanks used on a space vehicle

Interpersonal Relations and Task Performance

Purpose: The study draws on the social network theory to examine the influence of interpersonal relations on the task performance at the individual employee, team and divisional levels in the Nigerian Police Force. Design/methodology/approach: The study adopted a cross sectional survey design and a sample of 556 police men was selected through the application of multi-stage sampling procedures. The data collection instrument was designed in line with the 5-point Likert scale while the instrument was validated through content validity approach and the reliability of the instrument is determined using the test-retest method. Findings: Data were collected through the self-report of the policemen while analysis was carried out using descriptive statistics, run mean test and Chi-square test and the results indicated that interpersonal relations influence employee, team and divisional task performance in the Nigerian Police Force. Practical implications: We recommended that instrumental ties and social communities in the fabric of the Nigerian Police Force should be promoted to further advance the critical roles of crime fighting and prevention with a view to reducing criminality in Nigeria.  Originality/value: To the best of the authors' knowledge, this research is original and adds new value to the field by being the first of its kind. Paper type: Research pape

Women Participation in Politics and National Development

The contribution of women to the socio-economic and political development of any modern democratic state is essential and indispensable. This paper examines the extent of women participation in politics and national development in Nigeria. The study adopted secondary data as sources of information. The constraints of women participation in politics pose as hindrances to national development in Nigeria. It is discernible from this study that cultural, environmental and educational factors are major barriers to active women participation in politics. It is part of the objectives of this work to realize active women participation in National political life for a sustainable National development. Government at all levels should embark on enlightenment campaign to sensitize the public on the need for more women to embrace and pursue education as this is a catalyst for active women participation in politics. It is also recommended that coercive legislations should be made at all levels against every form of discrimination against women. Keywords: participation, politics, National development. DOI: 10.7176/IKM/9-7-03 Publication date: August 31st 201

Paper Session II-C - Feasibility of Astronomical Observatories on the Moon

The \u27Program Development \u27Directorate of the Marshall Space Flight Center (MSFQ, NASA, has conducted conceptual studies of an. evolutionary family of UV/Visible/IR optical telescopes to be based on the lunar surface. Included are: (1) the 16-trt aperture Latge Lunar Telescope (LLT); (2) the 4-in aperture precursor Lunar Cluster Telescope Experiment (LCTE); and (3) the 1 -m Lunar Ultraviolet Telescope Experiment (LUTE) proposed by John. McGraw of the University of New Mexico. \u27Development and emplacement of these advanced astronomical facilities would parallel the buildup of an initial lunar exploration site, an early Lunar \u27Outpost, and a permanent Lunar Base. The Directorate, in, conjunction with, astronomers of various institutions, has examined the feasibility of constructing such telescopes and has assessed technology, subsystem, system, transportation, operations, and logistics requirements for their development and emplacement Influences of\u27the lunar environment and site selection on telescope designi and operation wete also evaluated

Paper Session I-C - Evolution of Lunar Based Optical Astronomy Facilities

The evolution of lunar based optical telescopes has been studied by the George C. Marshall Space Flight Center (MSFC) from early 1989 to the present. This paper describes four lunar based telescopes which form a logical evolution from a 1-m aperture, UV transit telescope to a 16-m aperture, IR/Vis/UV facility. Key trades and issues which will be encountered in developing these systems are discussed. Experience has shown that developing and deploying a major space astronomy payload can stretch over as much as two decades. If the National Aeronautics and Space Administration (NASA) is to deploy the next generation of space-based telescopes within the next quarter-century, design planning must begin now to resolve the fundamental trades and major design issues raised by operating in the lunar environment

Effects of engine emissions from high-speed civil transport aircraft: A two-dimensional modeling study, part 1

The AER two-dimensional chemistry-transport model is used to study the effect on stratospheric ozone (O3) from operations of supersonic and subsonic aircraft. The study is based on six emission scenarios provided to AER. The study showed that: (1) the O3 response is dominated by the portion of the emitted nitrogen compounds that is entrained in the stratosphere; (2) the entrainment is a sensitive function of the altitude at which the material is injected; (3) the O3 removal efficiency of the emitted material depends on the concentrations of trace gases in the background atmosphere; and (4) evaluation of the impact of fleet operations in the future atmosphere must take into account the expected changes in trace gas concentrations from other activities. Areas for model improvements in future studies are also discussed