The intraocular pressure response to dehydration: a pilot study

This study was designed to determine the Intraocular Pressure (IOP) response to differing levels of dehydration. Seven males participated in a 90 minute treadmill walk (5 km/h and 1 % grade) in both a cool (22 °C) and hot (43 °C) climate. At Baseline and at 30 minute intervals measurements of IOP, by tonometery, and indicators of hydration status (nude weight and plasma osmolality (Posm)) were taken. Body temperature and heart rate were also measured at these time points. Statistically significant interactions (time point (4) by trial (2)) were observed for IOP (F = 10.747, p = 0.009) and body weight loss (F = 50.083, p < 0.001) to decrease, and Posm (F = 34.867, p < 0.001) to increase, by a significantly greater amount during the hot trial compared to the cool. A univariate general linear model showed a significant relationship between IOP and body weight loss (F = 37.63, p < 0.001) and Posm (F = 38.53, p < 0.001). A significant interaction was observed for body temperature (F = 20.908, p < 0.001) and heart rate (F = 25.487, p < 0.001) between the trials and time points, but there was negligible association between these variables and IOP (Pearson correlation coefficient < ±0.5). The present study provides evidence to suggest that IOP is influenced by hydration status

Developing physical capability standards that are predictive of success on special forces selection courses

Free to read This study aimed to develop minimum standards for physical capability assessments (vertical jump, sit and reach, push-ups, seven-stage sit-ups, heaves, agility, 20-m shuttle run, loaded 5-km pack march, and 400-m swim) that candidates must pass before they can commence Australian Army Special Forces (SF) selection courses. Soldiers (Part A: n = 104; Part B: n = 92) completed the physical capability assessments before commencing a SF selection course. At the beginning of these selection courses, participants attempted two barrier assessments (3.2-km battle run and 20-km march). Statistical analysis revealed several physical capability assessments were associated with performance on the barrier assessments and selection course outcome (Part A); however, these statistical models were unable to correctly classify all candidates as likely to pass or fail the selection course. Alternatively, manual analysis identified a combination of physical capability standards that correctly classified 14% to 18% of candidates likely to fail, without excluding any candidates able to pass (Part A). The standards were applied and refined through Part B and included completing the 5-km pack march in ≤45:45 minutes : seconds, achieving ≥level five on the sit-up test, or completing ≥66 push-ups. Implementation of these standards may reduce attrition rates and enhance the efficiency of the SF recruitment process

Rules for modelling in computer-aided fault tree synthesis

In the design of process plants safety has assumed an increasingly high profile. One of the techniques used in hazard identification is the fault tree, which involves first the synthesis of the tree and then its analysis. The construction of a fault tree, however, requires special skills and can be a time-consuming process. It is therefore attractive to develop computer aids for the synthesis stage to match those which already exist for the analysis of the tree. A computer based system for fault tree synthesis has been developed at Loughborough University. This thesis is part of a continuing programme of work associated with this facility. [Continues.

The ex-client’s experience of attitudinal and structural barriers to therapy, prior to and during the therapeutic relationship

People’s reluctance to seek/secure counselling/psychotherapy is an area requiring further attention. This study sought to add to existing research by undertaking phenomenological interviews exploring ex-clients experiences of seeking/securing help. Semi-structured, qualitative interviews were conducted with five participants who had experience of the counselling process. Transcribed interviews were analysed using the constant-comparative method and five themes emerged: public stigma, self-stigma, the counselling/psychotherapeutic environment, privacy/confidentiality, and waiting time to secure counselling. Results indicated public/self-stigma had affected participant experience, as had the counselling environment. Privacy/confidentiality was a concern with waiting times being less so. Recommendations to reduce the negative impact of public/self-stigma and the counselling environment are offered, as are areas requiring further research including advertising, location of service, self-stigma and home counselling/psychotherapy

An Examination of the United States Air Service\u27s Logistics Operations

This historical study details the U.S. Air Service\u27s logistics operations at home and abroad in an attempt to determine the relationship between the process and more recently established logistic principles. The information in the study was collected through an extensive review of both first hand accounts and historical compilations of the nature of World War I aviation logistics. Information regarding the production of the De Haviland DH-4 and Liberty Engine serve as the primary case examples of the operation of the logistics system. The established principles required for comparison were extracted from the writings of a number of expert military logisticians. After a careful review of the information, it seems that the production, transportation and supply aspects of the Air Service\u27s logistics system are in accordance with established principles while the area of domestic production was not. The establishment of a satisfactory domestic transportation infrastructure and a depot system allowed for flexible and timely logistics support. The initial lack of a viable production system nearly grounded the air effort. The Air Service was able to design a fully functioning logistics system in less than two years, and the experiences in World War I provided U.S. military aviation leaders with the knowledge needed to prepare itself for future military engagements

Housing Prices and Inter-urban Migration

Understanding the causes and consequences of human migration has long been of interest to urban and regional economists. Empirical studies build on the theoretical results of Roback (1982) and Mueser and Graves (1995) by estimating the effects of wages, housing prices, and amenities on inter-area migration. Findings with respect to amenities are clear (e.g., Rappaport 2007), and household-level studies consistently find that relative wages or incomes increase the probability that a household will select a given location (e.g., Berger and Blomquist 1992). In contrast, the results for housing prices are inconclusive. Studies that include area-level measures (e.g., median housing price for a metropolitan area) find a mix of negative, positive, and insignificant effects on inter-area migration decisions (e.g., Hunt and Mueller 2004). Many migration studies exclude housing price measures. This paper investigates the role of housing prices in influencing inter-urban household migration decisions. An important contribution of the study is the development of a new method for representing housing prices in migration analyses. Following the approach commonly used to model wages in studies of household migration, we identify the form of the utility function for which individual-specific housing prices can be predicted for unselected areas as a function of individual characteristics. Our theoretical results guide the development of an empirical measure of housing costs that accounts for the decision to own or rent and the cost of holding housing capital. We test our housing cost measure using the 2000 PUMS to identify point-to-point migration decisions for a large sample of college-educated males residing in 291 U.S. metropolitan areas. We estimate conditional logit models of metropolitan area choice, controlling for wages, a large range of amenities, and expected housing costs. Our key finding is that our proposed housing cost measure yields the expected results (higher housing prices reduce the probability that an area is selected), which is robust to alternative specifications and samples. We re-estimate our model using three alternative metropolitan area measures of housing costs: median house price, average apartment rent, and average urban land rent. We find that these measures consistently yield counterintuitive results.

PUBLIC CONSERVATION LAND AND EMPLOYMENT GROWTH IN THE NORTHERN FOREST REGION

As with many environmental issues, debates about increasing public conservation lands in the Northern Forest region frequently center on a perceived tradeoff between jobs and the environment. In particular, opponents of conservation lands often argue that employment will decline significantly when land is diverted from commodity-oriented uses such as wood products production. To evaluate this claim, we estimate a model of simultaneous employment and net migration growth using data on the 92 non-metropolitan counties comprising the region. Growth in employment and net migration are measured over the period 1990 to 1997 and the set of exogenous variables includes the 1990 share of the county land base in public conservation uses. We find that net migration rates were systematically higher in counties with more conservation lands, but the effects are relatively small. Public conservation lands were found to have no systematic effect on employment growth over the 1990 to 1997 period. Two extensions are considered. We examine the separate effects of preservationist and multiple-use lands. We also identify a "natural experiment" involving changes in national forest management that allows us to estimate the effects of diverting private forestland to public conservation uses. Our central conclusions are that existing public conservation lands have a positive, but small, effect on employment and migration in the Northern Forest region and that, over the range of our data, employment and migration are unlikely to be affected by timber harvest reductions resulting from the establishment of new conservation lands.Labor and Human Capital, Land Economics/Use,

Local Employment Growth, Migration, and Public Land Policy: Evidence from the Northwest Forest Plan

Debates over protecting public land reveal two views. Some argue protection reduces commodity production, reducing local employment and increasing out-migration. Others contend protection produces amenities that support job growth and attract migrants. We test these competing views for the Northwest Forest Plan (NWFP), which reallocated 11 million acres of federal land from timber production to protecting old-growth forest species. We find evidence that land protection directly reduced local employment growth and increased net migration. The total negative effect on employment was offset only slightly by positive migration-driven effects. Employment losses were concentrated in metropolitan counties, but percentage losses were higher in rural counties.amenities, employment growth, migration, Northwest Forest Plan, oldgrowth forests, public land management, Community/Rural/Urban Development, Land Economics/Use,