Combining high performance simulation, data acquisition, and graphics display computers

Issues involved in the continuing development of an advanced simulation complex are discussed. This approach provides the capability to perform the majority of tests on advanced systems, non-destructively. The controlled test environments can be replicated to examine the response of the systems under test to alternative treatments of the system control design, or test the function and qualification of specific hardware. Field tests verify that the elements simulated in the laboratories are sufficient. The digital computer is hosted by a Digital Equipment Corp. MicroVAX computer with an Aptec Computer Systems Model 24 I/O computer performing the communication function. An Applied Dynamics International AD100 performs the high speed simulation computing and an Evans and Sutherland PS350 performs on-line graphics display. A Scientific Computer Systems SCS40 acts as a high performance FORTRAN program processor to support the complex, by generating numerous large files from programs coded in FORTRAN that are required for the real time processing. Four programming languages are involved in the process, FORTRAN, ADSIM, ADRIO, and STAPLE. FORTRAN is employed on the MicroVAX host to initialize and terminate the simulation runs on the system. The generation of the data files on the SCS40 also is performed with FORTRAN programs. ADSIM and ADIRO are used to program the processing elements of the AD100 and its IOCP processor. STAPLE is used to program the Aptec DIP and DIA processors

Structural Design Concepts for a Multi-Megawatt Solar Electric Propulsion (SEP) Spacecraft

As a part of the Space Exploratory Initiative (SEI), NASA-Lewis is studying Solar Electric Propulsion (SEP) spacecraft to be used as a cargo transport vehicle to Mars. Two preliminary structural design concepts are offered for SEP spacecraft: a split blanket array configuration, and a ring structure. The split blanket configuration is an expansion of the photovoltaic solar array design proposed for Space Station Freedom and consists of eight independent solar blankets stretched and supported from a central mast. The ring structural concept is a circular design with the solar blanket stretched inside a ring. This concept uses a central mast with guy wires to provide additional support to the ring. The two design concepts are presented, then compared by performing stability, normal modes, and forced response analyses for varying levels of blanket and guy wire preloads. The ring structure configuration is shown to be advantageous because it is much stiffer, more stable, and deflects less under loading than the split blanket concept

General formalism for vibronic Hamiltonians in tetragonal symmetry and beyond

We derive general expansion formulas in vibrational coordinates for all bimodal Jahn–Teller and pseudo-Jahn–Teller Hamiltonians in tetragonal symmetry. Symmetry information of all the vibronic Hamiltonian matrix elements is fully carried by up to only 4 eigenvalues of symmetry operators. This problem-to-eigenvalue reduction enables us to handle thousands of vibronic problems in one work. The derived bimodal formulas can be easily extended to cover problems with one or more than two vibrational modes. They lay a solid foundation for future vibronic coupling studies of tetragonal systems. More importantly, the efficient derivation can be applied to handle (pseudo-)Jahn–Teller Hamiltonians for all problems with one principal symmetry axis

What is a prisoner of war for?

This article presents a conceptual map of the purposes served by continuing custody of prisoners of war and captured non-combatants. Morally legitimate and non-controversial purposes include preventing prisoners of war from rejoining their comrades-in-arms, preventing both prisoners of war and captured non-combatants from giving material support to combatants still in the field, facilitating orderly release and repatriation at the end of hostilities, and the prosecution for war crimes. Morally illegitimate purposes include punishment, exploitation as conscript labour, recruitment or conscription as combatants, exploitation for intelligence, display as proof of victory, and ideological indoctrination. Analysis of historical cases illustrating each purpose reveal that continuing custody is often motivated by multiple purposes, both legitimate and illegitimate. What explains adoption of multiple and illegitimate purposes for continuing custody? Prisoners are available for legitimate and illegitimate purposes because neither elites nor masses within the captor state typically view prisoners as members of the moral community.1 Continuing custody does not alter the perceived status of the captured as aliens who cannot be intuitively invested with expectations of reciprocity. This suggests both ending custody as soon as legitimate purposes are served and bringing the captured within the moral community while in continuing captivity. Scientia Militaria: South African Journal of Military Studies Vol. 36 (2) 2008: pp. 19-3

Effective programming of a school district\u27s educational access channel

The purpose of this study is to develop a district policy and practice of collecting and disseminating school information and public service announcements to the public using Atlantic City Public Schools\u27 educational access channel, ACTV Channel 2. Using a case study research design, the project will result in an evaluation of current usage by parents and families of children who attend Atlantic City Public Schools and what they would like to view. An upgrade in programming with more educational programs was a major objective for this study. To assist in programming improvement, a questionnaire survey was developed and was administered to a random sample of family members from Atlantic City Public Schools. 146 surveys were mailed and 100 were returned by the respondents. The results presented here are based on a survey design, which would be defined as a cross-sectional survey design. The results show that educational shows such as nature, science, history, reading, and mathematics are the most requested items to be viewed on ACTV Channel 2. Community and Atlantic City School District information was also highly requested by the respondents

Drug Design and Effectiveness of Tramadol

The pain reliever, Tramadol, has a unique structure with functional groups that contribute to the drug\u27s success. This poster for the Natural Sciences Poster Session at Parkland College provides the structure of the medication, identifies the nonmedical ingredients, and notes its effectiveness as well as its possible superiority to other pain relieving medications