A method of characteristics solution for the equations governing the unsteady flow of liquids in closed systems

Method of characteristics solution for equations governing unsteady flow of liquids in closed system

Modeling: An Effective Tool for Teaching Reading

Because children are more apt to model when they encounter an unfamiliar concept or different situation, modeling will probably be strongest at the beginning of the school year. However, there are principles of modeling that need to be considered daily

A Policy Architecture for Enhancing and Controlling Features

Abstract. Features provide extensions to a basic service, but in new systems users require much greater flexibility oriented towards their needs. Traditional features do not easily allow for this.We propose policies as the features of the future. Policies can be defined by the end-user, and allow for the use of rich context information when controlling calls. This paper introduces an architecture for policy definition and call control by policies. We discuss the operation of systems based on such an architecture. An important aspect of the architecture is integral feature interaction handling

The ACCENT Policy Server

The designs expressed in this report are copyright of the University of Stirling. Certain aspects may also be protected by patents held by Mitel Networks Corporation. Publication of this report does not confer the right to use or adapt these designs in whole or in part. The ACCENT project was concerned with developing a practical and comprehensive policy language for call control. The project therefore studied a number of distinct tasks: the definition of the language, and also a threelayer architecture for deploying and enforcing policies defined in the language. This document focuses on the policy system layer of the three-layer architecture. The policy system layer is concerned with storing, deploying and enforcing policies. It represents the core functionality of the three-layer architecture. This report discusses the prototype implementation at a technical level. It is intended as supporting documentation for developers continuing to enhance the prototype, as well as those wishing to gain an insight into the technical details of the policy server layer

Propulsion and Space Vehicle Systems Analysis Program Tensor I, volume I Technical report no. 341

Computer program for space vehicle and propulsion systems analysi

Electrostatic protection of the Solar Power Satellite and rectenna

Several features of the interactions of the solar power satellite (SPS) with its space environment were examined theoretically. The voltages produced at various surfaces due to space plasmas and the plasma leakage currents through the kapton and sapphire solar cell blankets were calculated. At geosynchronous orbit, this parasitic power loss is only 0.7%, and is easily compensated by oversizing. At low-Earth orbit, the power loss is potentially much larger (3%), and anomalous arcing is expected for the EOTV high voltage negative surfaces. Preliminary results of a three dimensional self-consistent plasma and electric field computer program are presented, confirming the validity of the predictions made from the one dimensional models. Magnetic shielding of the satellite, to reduce the power drain and to protect the solar cells from energetic electron and plasma ion bombardment is considered. It is concluded that minor modifications can allow the SPS to operate safely and efficiently in its space environment. The SPS design employed in this study is the 1978 MSFC baseline design utilizing GaAs solar cells at CR-2 and an aluminum structure

APPEL: An Adaptable and Programmable Policy Environment and Language

The Accent project (Advanced Component Control Enhancing Network Technologies) developed a practical and comprehensive policy system for call control/Internet telephony. The policy system has subsequently been extended for management of sensor networks/wind farms and of home care/telecare. This report focuses on Appel (Adaptable and Programmable Policy Environment and Language). It provides an overview of the language, and presents the language in XML schema form. The core language has been instantiated for call control, for sensor networks, and for home care. Sample goals and policies of different kinds are provided to illustrate these applications