Plume flowfield analysis of the shuttle primary Reaction Control System (RCS) rocket engine

A solution was generated for the physical properties of the Shuttle RCS 4000 N (900 lb) rocket engine exhaust plume flowfield. The modeled exhaust gas consists of the five most abundant molecular species, H2, N2, H2O, CO, and CO2. The solution is for a bare RCS engine firing into a vacuum; the only additional hardware surface in the flowfield is a cylinder (=engine mount) which coincides with the nozzle lip outer corner at X = 0, extends to the flowfield outer boundary at X = -137 m and is coaxial with the negative symmetry axis. Continuum gas dynamic methods and the Direct Simulation Monte Carlo (DSMC) method were combined in an iterative procedure to produce a selfconsistent solution. Continuum methods were used in the RCS nozzle and in the plume as far as the P = 0.03 breakdown contour; the DSMC method was used downstream of this continuum flow boundary. The DSMC flowfield extends beyond 100 m from the nozzle exit and thus the solution includes the farfield flow properties, but substantial information is developed on lip flow dynamics and thus results are also presented for the flow properties in the vicinity of the nozzle lip

Development of a gas sampling system

Theoretical analysis and computed performance evaluation of high speed entry vehicle gas sampling syste

Extension of gage calibration study in extreme high vacuum /orbitron and magnetron studies/

Orbitron and magnetron studies for gauge calibration in extreme high vacuu

Warped Supersymmetric Unification with Non-Unified Superparticle Spectrum

We present a new supersymmetric extension of the standard model. The model is constructed in warped space, with a unified bulk symmetry broken by boundary conditions on both the Planck and TeV branes. In the supersymmetric limit, the massless spectrum contains exotic colored particles along with the particle content of the minimal supersymmetric standard model (MSSM). Nevertheless, the model still reproduces the MSSM prediction for gauge coupling unification and does not suffer from a proton decay problem. The exotic states acquire masses from supersymmetry breaking, making the model completely viable, but there is still the possibility that these states will be detected at the LHC. The lightest of these states is most likely A_5^XY, the fifth component of the gauge field associated with the broken unified symmetry. Because supersymmetry is broken on the SU(5)-violating TeV brane, the gaugino masses generated at the TeV scale are completely independent of one another. We explore some of the unusual features that the superparticle spectrum might have as a consequence.Comment: 21 pages, Latex, version to appear in Phys. Rev.

Laser modulation at the atomic level monthly report no. 8, 1 - 28 feb. 1965

Measurement of temperature dependence of energy levels involved in laser emissio

Laser modulation at the atomic level monthly report no. 7, 1-31 jan. 1965

Laser modulation at atomic level - yttrium- aluminum garnet emission and laser emission shift with homogeneous pulsed magnetic fiel

Effects of dogmatism on computer literacy*

Dogmatism and other individual characteristics affect the level of computer literacy (information fundamentals) reached in the introductory courses in Management Information Systems (MIS), perhaps as much as the investment education institution have made in software and hardware. This paper reports on the results of a questionnaire on computer literacy, dogmatism, and KolVs Learning Styles Inventory (KLSI) given to 80 students at the end of an introductory MIS course. Differences in the literacy and learning styles were analyzed from the perspective of dogmatism. The results indicated thai the scores in dogmatism inversely matched the scores in computer literacy. The effects of dogmatism on learning styles was mixed. To increase the levels of computer literacy, we need to examine other personal characteristics as they apply to learning computer and information teamologies

Fiber-diffraction Interferometer using Coherent Fiber Optic Taper

We present a fiber-diffraction interferometer using a coherent fiber optic taper for optical testing in an uncontrolled environment. We use a coherent fiber optic taper and a single-mode fiber having thermally-expanded core. Part of the measurement wave coming from a test target is condensed through a fiber optic taper and spatially filtered from a single-mode fiber to be reference wave. Vibration of the cavity between the target and the interferometer probe is common to both reference and measurement waves, thus the interference fringe is stabilized in an optical way. Generation of the reference wave is stable even with the target movement. Focus shift of the input measurement wave is desensitized by a coherent fiber optic taper

Improvements in computer literacy linked to gender and learning style

Four-year colleges and universities have invested time, faculty, floor space, and monies for software and hardware in teaching introductory courses in Management Information Systems (MIS). Do these resources increase the level of computer literacy (hiformation fundamentals)? This paper reports on the before and after results of a questionnaire on computer literacy given to 143 students taking an introductory MIS course. Differences in the amount of learning are analyzed from the perspective of a variety of demographic factors (age, gender, typing skills, and computer access) and Kolb\u27s Learning Styles Inventory (KLSI)