Line-oriented flight training: Northwest Airlines

An exemption from certain FAA regulations which stereotype simulator flight training was obtained and pilots with current line experience were used to prepare and develop scenarios for a program in which each crew member would be trained to recognize and properly use all available resouces. The development of the scenarios for training to proficiency and pilot reaction to the training sessions are discussed

Admiralty Law and its Relation to Command at Sea

Since mid-1950, the Navy has increased greatly in size; not only as to ships of the Navy itself but as to ships of the Military Transportation Service as well. Increases have been largely by way of activation of ships of the moth ball fleet. Relatively few new ships have been added to our active seagoing forces

A three-year follow-up survey of demographic changes in a Ugandan town on the trans-African highway with high HIV-1 seroprevalence

A 1991 serosurvey in a Ugandan trading town on the trans-African highway reported a 40 per cent HIV-1 prevalence in adults. Three years later in a repeat survey of the 531 adults resident in 1991, 279 (53%) were still present, 196 (37%) had left and 56 (11%) had died. There were 138 new residents and 46 children had become adults, making a total of 463 adults in 1994, 13 per cent less than 1991. Most immigrants (91%) came from the surrounding rural district whereas 38 per cent of emigrants went to an urban area. A significant inverse association between wealth and seropositivity was found for women but not men. Of the original residents 157 were known to be HIV-1 positive in 1991; 31 (20%) had died compared to 10 (4%) of the 232 known to be seronegative, representing an HIV-1 attributable mortality fraction of 60 per cent

Kapok bush (aerua tomentosa)

A very useful perennial for North-West pastoral areas In our drier North-West pastoral areas rains are normally confined to the summer J. months. Dependent upon cyclonic influences, they are very uncertain, and a region said to enjoy an average of 10in. rain per year, might have as little as 1in or as much as 30in. in any one season. Whether the recordings are high or low they are nearly always confined to those few summer months, and a long dry period generally extend without break from May to December

Station management —the value of deferred grazing

MOST station people resent any inference that the deterioration in carrying capacity of their country is in any way due to overstocking in past years. A popular, but not very constructive, view is that seasons have become progressively less favourable and that one of these days those soaking summer rains will return and all will be well again

A physics-based life prediction methodology for thermal barrier coating systems

A novel mechanistic approach is proposed for the prediction of the life of thermal barrier coating (TBC) systems. The life prediction methodology is based on a criterion linked directly to the dominant failure mechanism. It relies on a statistical treatment of the TBC's morphological characteristics, non-destructive stress measurements and on a continuum mechanics framework to quantify the stresses that promote the nucleation and growth of microcracks within the TBC. The last of these accounts for the effects of TBC constituents' elasto-visco-plastic properties, the stiffening of the ceramic due to sintering and the oxidation at the interface between the thermally insulating yttria stabilized zirconia (YSZ) layer and the metallic bond coat. The mechanistic approach is used to investigate the effects on TBC life of the properties and morphology of the top YSZ coating, metallic low-pressure plasma sprayed bond coat and the thermally grown oxide. Its calibration is based on TBC damage inferred from non-destructive fluorescence measurements using piezo-spectroscopy and on the numerically predicted local TBC stresses responsible for the initiation of such damage. The potential applicability of the methodology to other types of TBC coatings and thermal loading conditions is also discussed