Preliminary ISIS users manual

The Interactive Software Invocation (ISIS), an interactive data management system, was developed to act as a buffer between the user and host computer system. The user is provided by ISIS with a powerful system for developing software or systems in the interactive environment. The user is protected from the idiosyncracies of the host computer system by providing such a complete range of capabilities that the user should have no need for direct access to the host computer. These capabilities are divided into four areas: desk top calculator, data editor, file manager, and tool invoker

ISIS users manual

A user manual for the interactive software invocation system (ISIS) is presented. The operational concepts and syntax of the interactive programming language are documented

Controls-structures-electromagnetics interaction program

A technology development program is described involving Controls Structures Electromagnetics Interaction (CSEI) for large space structures. The CSEI program was developed as part of the continuing effort following the successful kinematic deployment and RF tests of the 15 meter Hoop/Column antenna. One lesson learned was the importance of making reflector surface adjustment after fabrication and deployment. Given are program objectives, ground based test configuration, Intelsat adaptive feed, reflector shape prediction model, control experiment concepts, master schedule, and Control Of Flexible Structures-II (COFS-II) baseline configuration

An operational satellite scatterometer for wind vector measurements over the ocean

Performance requirements and design characteristics of a microwave scatterometer wind sensor for measuring surface winds over the oceans on a global basis are described. Scatterometer specifications are developed from user requirements of wind vector measurement range and accuracy, swath width, resolution cell size and measurement grid spacing. A detailed analysis is performed for a baseline fan-beam scatterometer design, and its performance capabilities for meeting the SeaSat-A user requirements. Various modes of operation are discussed which will allow the resolution of questions concerning the effects of sea state on the scatterometer wind sensing ability and to verify design boundaries of the instrument

Modeling and Control of Re-Entry Heat Transfer Problem using Neural Networks

A nonlinear optimal re-entry temperature control problem is solved using single network adaptive critic (SNAC) technique. The nonlinear model developed and used accounts for conduction, convection and radiation at high temperature, represents the dynamics of heat transfer in a cooling fin for an object re-entering the earth\u27s atmosphere. Simulation results demonstrate that the control synthesis technique presented is very effective in obtaining a desired temperature profile over a wide envelope of initial temperature distribution

Fixed base simulator study of an externally blown flap STOL transport airplane during approach and landing

A fixed-base simulator study was conducted to determine the flight characteristics of a representative STOL transport having a high wing and equipped with an external-flow jet flap in combination with four high-bypass-ratio fan-jet engines during the approach and landing. Real-time digital simulation techniques were used. The computer was programed with equations of motion for six degrees of freedom and the aerodynamic inputs were based on measured wind-tunnel data. A visual display of a STOL airport was provided for simulation of the flare and touchdown characteristics. The primary piloting task was an instrument approach to a breakout at a 200-ft ceiling with a visual landing

Predictive Values of Factors Affecting Reading Comprehension Assessment

The complex nature of reading comprehension makes it challenging to assess. Comprehension assessment results frequently do not directly indicate which skills should be addressed to remediate comprehension difficulties. The current study investigated which underlying skills are most related to a common reading comprehension test. The reading skills that were measured in this study include single-word reading accuracy, single-word reading fluency, textual reading fluency and accuracy, oral reading comprehension abilities, and silent reading comprehension abilities. The findings indicate that reading rate is associated with oral reading comprehension abilities and that word reading accuracy is important for oral reading comprehension abilities

An Analysis of Strength Retention During an Eight-Week Walk/Jog Training Program

The purpose of this study was to determine the effects of an eight-week walk/jog program upon strength retention. Twenty-four male executives from Dallas, Texas represented the sample size Following eight weeks of resistive training, all subjects were pretested for strength and endurance measures. After the eight-week walk/jog program, all subjects were then retested adhering to the same pretest protocol. A two-way analysis of variance with repeated measures was used to test for mean group differences between pretest and posttest strength measures. A t-test for dependent means was utilized to ascertain differences in cardiovascular measurements. The alpha chosen to test the null hypotheses was the 0.05 level of significance. Results indicated that muscular strength was retained during the eight-week walk/jog program. No change in upper or lower extremity strength occurred, but significant improvements in maximal oxygen consumption and treadmill time were evidenced

The 15-meter antenna performance optimization using an interdisciplinary approach

A 15-meter diameter deployable antenna has been built and is being used as an experimental test system with which to develop interdisciplinary controls, structures, and electromagnetics technology for large space antennas. The program objective is to study interdisciplinary issues important in optimizing large space antenna performance for a variety of potential users. The 15-meter antenna utilizes a hoop column structural concept with a gold-plated molybdenum mesh reflector. One feature of the design is the use of adjustable control cables to improve the paraboloid reflector shape. Manual adjustment of the cords after initial deployment improved surface smoothness relative to the build accuracy from 0.140 in. RMS to 0.070 in. Preliminary structural dynamics tests and near-field electromagnetic tests were made. The antenna is now being modified for further testing. Modifications include addition of a precise motorized control cord adjustment system to make the reflector surface smoother and an adaptive feed for electronic compensation of reflector surface distortions. Although the previous test results show good agreement between calculated and measured values, additional work is needed to study modelling limits for each discipline, evaluate the potential of adaptive feed compensation, and study closed-loop control performance in a dynamic environment

Beneficial insects

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