F100(3) parallel compressor computer code and user's manual

The Pratt & Whitney Aircraft multiple segment parallel compressor model has been modified to include the influence of variable compressor vane geometry on the sensitivity to circumferential flow distortion. Further, performance characteristics of the F100 (3) compression system have been incorporated into the model on a blade row basis. In this modified form, the distortion's circumferential location is referenced relative to the variable vane controlling sensors of the F100 (3) engine so that the proper solution can be obtained regardless of distortion orientation. This feature is particularly important for the analysis of inlet temperature distortion. Compatibility with fixed geometry compressor applications has been maintained in the model

Stability Analysis of the Mg2Si Phase in AA 6061 Aluminum Alloy

AbstractThe spent MTR fuel elements, manufactured with the aluminum-based alloy AA 6061, are stored under water in interim storage basins. In such conditions the AA 6061 is susceptible to degradation by localized corrosion processes which might be related to the behavior of second-phase particles present in the alloy.According to its electrochemical behavior, the second-phase particles present in AA 6061 can be classified into cathodic or anodic in relation to the aluminum matrix.In order to investigate the stability of the Mg2Si phase, which dissolves in high purity water, immersion and polarization tests were carried out in alkaline solutions. SEM and EDS were used to analyze the second-phase particles after the tests.It was determined that Mg2Si phase particles are stable in solutions of pH 8 to 14, and undergo selective magnesium dissolution from pH 7 to lower values

Microwave device investigations Semiannual progress report, 1 Apr. - 1 Oct. 1968

Beam-plasma interactions, cyclotron harmonic instabilities, harmonic generation in beam-plasma system, relativistic electron beam studies, and materials test

Frequency multiplication in high-energy electron beams Semiannual progress report, 1 Oct. 1967 - 31 Mar. 1968

Electron beam-plasma interactions, cyclotron harmonic instabilities, paramagnetic and semiconductor materials, and harmonic current generatio

Caracterização molecular de populações de Fusarium oxysporum f. sp. cubense em regiões produtoras de banana na Bahia.

O mal-do-Panamá, causado pelo fungo Fusarium oxysporum f. sp. cubense (Foc), é uma das doenças mais destrutivas da bananeira, sendo considerada entre as cinco doenças economicamente mais importantes de todos os tempos. O fato de ser causada por um fungo do solo que, mesmo na ausência da cultura, sobrevive por períodos prolongados, faz com que a medida de controle mais efetiva seja o uso de variedades resistentes. Desta forma, o projeto tem como objetivo caracterizar populações brasileiras de Foc por meio de marcadores SSR

Apis florea in Jordan: source of the founder population

A recent isolated population of Apis florea has been reported from Aqaba in Jordan at the Red Sea, consisting of numerous colonies within a still limited range which apparently is expanding. This region is about 1500 km apart from its next occurrences in Sudan where it had been introduced and first detected in 1985 and about 2000 km apart from its next natural occurrences in Iran and Oman. These bees apparently have been imported by human transport, most likely by ship. This new location thus represents a major jump in the progression of the species still to fill a wide area of possible locations offering adequate living conditions. Here we attempt to track the possible origin of this new population by morphometric methods. This analysis indicated closest relation to A. florea from Oman, thus being the most likely source of this population

Tungsten nuclear rocket, phase I, part 1 Final report

Tungsten water moderated nuclear rocket reactor experiments and analyse

Survey to Inform the Development of an Online Support System for Higher Education Students - Higher Education and Online Support

An increasing number of higher education students face mental health difficulties, but the universities’ student support services (SSS) struggle to meet demand with limited resources. Web-based alternatives hold promise as a novel medium through which students could access support. Online interventions appear to be effective and may therefore provide a cost-effective alternative, relieving some of the burden on struggling SSS. This paper presents results from an explorative survey of 61 students questioned about their opinion of online support systems. The majority of students indicated that they would use such a system and that it should be interactive and personalized, focusing on time and money management, relaxation exercises, and building social skills. Future directions towards the development of such a system are discussed