Advanced refractory alloy corrosion loop program Quarterly progress report, 15 Jul. - 15 Oct. 1970

Evaluation of T-111 refractory alloy Rankine system corrosion test loo

Advanced refractory alloy corrosion loop program Quarterly progress report, 15 Jan. 1970 - 15 Apr. 1970

Operation and evaluation of Rankine system corrosion test loop based on refractory alloy

Cortisol reactivity to psychosocial stress is greater in sexual risk takers

Several studies have reported an association between deviant behaviour and cortisol reactivity to stress. However relatively few studies have investigated the relationship between psychobiological stress reactivity and sexual risk taking behaviours. In the present study, cortisol reactivity to the Trier Social Stress Test (TSST) was measured in 26 healthy young adults prior to the administration of a sexual health and behaviour questionnaire. The cortisol response to the TSST was greater in those individuals who reported that at least one of their previous two sexual partners was someone whom they had just met. Results are discussed in context of a model which suggests that early life stress dysregulates the hypothalamic-pituitary-adrenal (HPA) axis and increases the likelihood of later life risk taking behaviour. The findings have implications in terms of improving our understanding of psychobiological factors which predispose individuals to engage in adverse sexual health behaviours

Environmental capacity in the East Midlands: an evidence base fit for purpose

This report relates to the initial study into the measurement of Environmental Capacity within the East Midlands Region considering what indicators/measures of Environmental Capacity can be put into place in the near future within the region and what are the aspirations regarding longer term indicators / measures of Environmental Capacity in the region. The study involved in depth interviews with relevant employees from local authorities and other key agencies within the region covering the current data collected/used in monitoring and the possible link to the monitoring of Environmental Capacity as well as the interviewees' awareness of and attitudes towards Environmental Capacity as a monitoring tool

Relationships between nutrients, periphyton abundance, and benthic macroinvertebrate scrapers in Ozark Highland streams

We collected samples from seven Arkansas streams during the months of August 2014 and February 2015 with the objective of determining possible relationships between nutrients, periphyton abundance and benthic macroinvertebrates. We hypothesized that periphyton would be positively associated with nutrients, and that increases in periphyton biomass would increase the abundance and diversity of benthic scraper families. Samples were collected from three transects at each site. The periphyton was analyzed for carbon, nitrogen, phosphorus, and ash free dry mass and Chl-a content. Macroinvertebrates families belonging to the feeding group of grazers/scrapers were compared with water column and periphyton nutrient concentrations, as well as Chl-a and ash free dry mass of periphyton from each site using correlation techniques. Negative linear correlations were observed between particulate phosphorus within the periphyton and Simpson (1-D) diversity (r=-0.87; ps=0.92;

Human impacts on water systems: Biological assessment of water quality in the Bosque Protector Río Guajalito (BPRG) using aquatic macroinvertebrates

Benthic macroinvertebrates have been extensively used as bioindicators for water quality due to their varying sensitivity to a diverse range of impacts on hydrographic sources. In this study a sampling of macroinvertebrates was carried out in the Guajalito and Brincador rivers and a small creek that runs through the private reserve Bosque Protector Rio Guajalito in order to analyze if the health of the rivers has changed in relation to previous studies. The sampling stations were located upstream and downstream of potential sources of disturbance in each of the three streams sampled in order to determine what level of impact the disturbance had on the stream. Additionally basic physiochemical parameters were characterized at each sampling station to validate the biological data. Significant differences were observed in the water quality biotic indexes of BMWP and IBMWP between the three streams sampled. There were no significant differences, however, in the abundance, richness, biological index scores, and diversity measures between the upstream and downstream stations. According to the biological index scores of BMWP and IBMWP, the three streams sampled have fair and good water quality. According to the BMWP/Col, Sensibilidad, FBI and %EPT indexes, however, the streams rank as good, very good, and excellent. These results are consistent with the previous study conducted by Arroyo (2007) and indicate that the water quality conditions have not significantly changed in the time since that study

An Empirical Study of a Software Maintenance Process

This paper describes how a process support tool is used to collect metrics about a major upgrade to our own electronic retail system. An incremental prototyping lifecycle is adopted in which each increment is categorised by an effort type and a project component. Effort types are Acquire, Build, Comprehend and Design and span all phases of development. Project components include data models and process models expressed in an OO modelling language and process algebra respectively as well as C++ classes and function templates and build components including source files and data files. This categorisation is independent of incremental prototyping and equally applicable to other software lifecycles. The process support tool (PWI) is responsible for ensuring the consistency between the models and the C++ source. It also supports the interaction between multiple developers and multiple metric-collectors. The first two releases of the retailing software are available for ftp from oracle.ecs.soton.ac.uk in directory pub/peter. Readers are invited to use the software and apply their own metrics as appropriate. We would be interested to correspond with anyone who does so

Coded-aperture imaging in nuclear medicine

Coded-aperture imaging is a technique for imaging sources that emit high-energy radiation. This type of imaging involves shadow casting and not reflection or refraction. High-energy sources exist in x ray and gamma-ray astronomy, nuclear reactor fuel-rod imaging, and nuclear medicine. Of these three areas nuclear medicine is perhaps the most challenging because of the limited amount of radiation available and because a three-dimensional source distribution is to be determined. In nuclear medicine a radioactive pharmaceutical is administered to a patient. The pharmaceutical is designed to be taken up by a particular organ of interest, and its distribution provides clinical information about the function of the organ, or the presence of lesions within the organ. This distribution is determined from spatial measurements of the radiation emitted by the radiopharmaceutical. The principles of imaging radiopharmaceutical distributions with coded apertures are reviewed. Included is a discussion of linear shift-variant projection operators and the associated inverse problem. A system developed at the University of Arizona in Tucson consisting of small modular gamma-ray cameras fitted with coded apertures is described

T-111 Rankine system corrosion test loop, volume 2

For abstract, see N76-18258