3,703 research outputs found
Review of "Mathematical Models for Neglected Tropical Diseases: Essential Tools for Control and Elimination, Part B" Edited by Maria-Gloria Basáñez and Roy M. Anderson.
Book detailsBasáñez MG, Anderson RM, Editors: Mathematical Models for Neglected Tropical Diseases: Essential Tools for Control and Elimination, Part B, Volume 94, Advances in Parasitology, Academic Press; 2016, 430 pages. ISBN: 978-0-12-809971-1
Dynamic Considerations for Control of Closed Life Support Systems
Reliability of closed life support systems depend on their ability to continue supplying the crew's needs during perturbations and equipment failures. The dynamic considerations interact with the basic static design through the sizing of storages, the specification of excess capacities in processors, and the choice of system initial state. A very simple system flow model was used to examine the possibilities for system failures even when there is sufficient storage to buffer the immediate effects of the perturbation. Two control schemes are shown which have different dynamic consequences in response to component failures
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Teacher perceptions of ability grouping practices in middle schools.
The purpose of this study is to determine middle school teachers\u27 thoughts on ability grouping. Specifically, this study identifies the reasons that teachers retain (R group) or eliminate (E group) ability grouping practices. Data from thirty-one teachers were categorized through the use of qualitative research methodology. This study focuses on three research questions: (1) What do middle school teachers perceive to be the advantages of ability grouping? (2) What do middle school teachers perceive to be the disadvantages of ability grouping? (3) What alternative grouping practices do middle school teachers utilize to replace ability grouping? Teachers who support ability grouping do not believe what they read and hear about ability grouping. For them, ability grouping may not be the best way to work with young adolescents in schools, but it works reasonably well and they do not believe another way of grouping is worth the effort, or works any better. They may not want to change for a variety of other reasons. Their beliefs may limit thinking or they may not want to invest the time, energy, and thought necessary to alter ability grouping practices. These ideas, coupled with the notion that teaching ability grouped classes is easier and change is difficult, form the basis for their perceived advantages of ability grouping. R group teachers state as many disadvantages of ability grouping as they do advantages. E group teachers are more adamant in their perceptions. They state fewer advantages of ability grouping, and many times more disadvantages. They believe that non-ability grouped methods, coupled with other teaching methodologies, are effective ways to teach middle school students. Sixteen of seventeen teachers interested in eliminating ability grouping had taught in both ability grouped and non-ability grouped classrooms. The opposite was true for the teachers who wished to retain ability grouping. Only one of the fourteen R group teachers had taught both ability grouped and non-ability grouped classes. This suggests that to be supportive of eliminating ability grouping in classrooms, teachers must use both types of instruction. Teachers who have chosen to eliminate ability grouping in their schools and classrooms have bridged the gap between acceptance of the status quo and taking action. Their actions are based upon a strong belief that they can be successful and benefit all students, both academically and socially
Application of control theory to dynamic systems simulation
The application of control theory is applied to dynamic systems simulation. Theory and methodology applicable to controlled ecological life support systems are considered. Spatial effects on system stability, design of control systems with uncertain parameters, and an interactive computing language (PARASOL-II) designed for dynamic system simulation, report quality graphics, data acquisition, and simple real time control are discussed
A high-rate telemetry system for the Mariner Mars 1969 mission
High rate telemetry system for Mariner Mars 1969 missio
Study of controlled diffusion stator blading. 1. Aerodynamic and mechanical design report
Pratt & Whitney Aircraft is conducting a test program for NASA in order to demonstrate that a controlled-diffusion stator provides low losses at high loadings and Mach numbers. The technology has shown great promise in wind tunnel tests. Details of the design of the controlled diffusion stator vanes and the multiple-circular-arc rotor blades are presented. The stage, including stator and rotor, was designed to be suitable for the first-stage of an advanced multistage, high-pressure compressor
Control and modeling of a CELSS (Controlled Ecological Life Support System)
Research topics that arise from the conceptualization of control for closed life support systems which are life support systems in which all or most of the mass is recycled are discussed. Modeling and control of uncertain and poorly defined systems, resource allocation in closed life support systems, and control structures or systems with delay and closure are emphasized
An approach to the preliminary evaluation of Closed Ecological Life Support System (CELSS) scenarios and control strategies
Life support systems for manned space missions are discussed. A scenario analysis method was proposed for the initial step of comparing possible partial or total recycle scenarios. The method is discussed in detail
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